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v/vlib/compiler/parser.v

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// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
module compiler
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import (
os
strings
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)
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struct Parser {
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file_path string // if parsing file will be path eg, "/home/user/hello.v"
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file_name string // "hello.v"
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file_platform string // ".v", "_windows.v", "_nix.v", "_darwin.v", "_linux.v" ...
// When p.file_pcguard != '', it contains a
// C ifdef guard clause that must be put before
// the #include directives in the parsed .v file
file_pcguard string
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v &V
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pref &Preferences // Preferences shared from V struct
mut:
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scanner &Scanner
tokens []Token
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token_idx int
tok TokenKind
prev_tok TokenKind
prev_tok2 TokenKind // TODO remove these once the tokens are cached
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lit string
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cgen &CGen
table &Table
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import_table ImportTable // Holds imports for just the file being parsed
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pass Pass
os OS
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inside_const bool
expr_var Var
has_immutable_field bool
first_immutable_field Var
assigned_type string // non-empty if we are in an assignment expression
expected_type string
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tmp_cnt int
builtin_mod bool
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inside_if_expr bool
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inside_unwrapping_match_statement bool
inside_return_expr bool
inside_unsafe bool
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is_struct_init bool
if_expr_cnt int
for_expr_cnt int // to detect whether `continue` can be used
ptr_cast bool
calling_c bool
cur_fn Fn
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local_vars []Var // local function variables
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var_idx int
returns bool
vroot string
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is_c_struct_init bool
is_empty_c_struct_init bool
is_c_fn_call bool
can_chash bool
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attr string
v_script bool // "V bash", import all os functions into global space
var_decl_name string // To allow declaring the variable so that it can be used in the struct initialization
is_alloc bool // Whether current expression resulted in an allocation
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is_const_literal bool // `1`, `2.0` etc, so that `u64_var == 0` works
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in_dispatch bool // dispatching generic instance?
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is_vgen bool
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is_vweb bool
is_sql bool
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is_js bool
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sql_i int // $1 $2 $3
sql_params []string // ("select * from users where id = $1", ***"100"***)
sql_types []string // int, string and so on; see sql_params
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is_vh bool // parsing .vh file (for example `const (a int)` is allowed)
pub:
mod string
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}
const (
MaxModuleDepth = 4
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)
// new parser from string. unique id specified in `id`.
// tip: use a hashing function to auto generate `id` from `text` eg. sha1.hexhash(text)
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fn (v mut V) new_parser_from_string(text string) Parser {
mut p := v.new_parser(new_scanner(text))
p.scan_tokens()
return p
}
fn (v mut V) reset_cgen_file_line_parameters(){
v.cgen.line = 0
v.cgen.file = ''
v.cgen.line_directives = v.pref.is_vlines
}
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fn (v mut V) new_parser_from_file(path string) Parser {
v.reset_cgen_file_line_parameters()
//println('new_parser("$path")')
mut path_pcguard := ''
mut path_platform := '.v'
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for path_ending in ['_lin.v', '_mac.v', '_win.v', '_nix.v', '_linux.v',
'_darwin.v', '_windows.v'] {
if path.ends_with(path_ending) {
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if path_ending == '_mac.v' {
p := path_ending.replace('_mac.v', '_darwin.v')
println('warning: use "$p" file name instead of "$path"')
}
if path_ending == '_lin.v' {
p := path_ending.replace('_lin.v', '_linux.v')
println('warning: use "$p" file name instead of "$path"')
}
if path_ending == '_win.v' {
p := path_ending.replace('_win.v', '_windows.v')
println('warning: use "$p" file name instead of "$path"')
}
path_platform = path_ending
path_pcguard = platform_postfix_to_ifdefguard( path_ending )
break
}
}
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mut p := v.new_parser(new_scanner_file(path))
p = { p|
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file_path: path,
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file_name: path.all_after(os.path_separator),
file_platform: path_platform,
file_pcguard: path_pcguard,
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is_vh: path.ends_with('.vh'),
v_script: path.ends_with('.vsh')
}
if p.v_script {
println('new_parser: V script')
}
if p.pref.building_v {
p.scanner.should_print_relative_paths_on_error = true
}
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//if p.pref.generating_vh {
// Keep newlines
//p.scanner.is_vh = true
//}
p.scan_tokens()
//p.scanner.debug_tokens()
return p
}
// creates a new parser. most likely you will want to use
// `new_parser_file` or `new_parser_string` instead.
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fn (v mut V) new_parser(scanner &Scanner) Parser {
v.reset_cgen_file_line_parameters()
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mut p := Parser {
scanner: scanner
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v: v
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table: v.table
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cur_fn: EmptyFn
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cgen: v.cgen
pref: v.pref
os: v.os
vroot: v.vroot
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local_vars: [Var{}].repeat(MaxLocalVars)
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import_table: new_import_table()
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}
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$if js {
p.is_js = true
}
if p.pref.is_repl {
p.scanner.should_print_line_on_error = false
p.scanner.should_print_errors_in_color = false
p.scanner.should_print_relative_paths_on_error = true
}
return p
}
fn (p mut Parser) scan_tokens() {
for {
res := p.scanner.scan()
p.tokens << Token{
tok: res.tok
lit: res.lit
line_nr: p.scanner.line_nr
col: p.scanner.pos - p.scanner.last_nl_pos
}
if res.tok == .eof {
break
}
}
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}
fn (p mut Parser) set_current_fn(f Fn) {
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p.cur_fn = f
//p.cur_fn = p.table.fns[f.name]
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p.scanner.fn_name = '${f.mod}.${f.name}'
}
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fn (p mut Parser) next() {
p.prev_tok2 = p.prev_tok
p.prev_tok = p.tok
p.scanner.prev_tok = p.tok
if p.token_idx >= p.tokens.len {
p.tok = TokenKind.eof
p.lit = ''
return
}
res := p.tokens[p.token_idx]
p.token_idx++
p.tok = res.tok
p.lit = res.lit
p.scanner.line_nr = res.line_nr
p.cgen.line = res.line_nr
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}
fn (p & Parser) peek() TokenKind {
if p.token_idx >= p.tokens.len - 2 {
return TokenKind.eof
}
tok := p.tokens[p.token_idx]
return tok.tok
}
// TODO remove dups
[inline] fn (p &Parser) prev_token() Token {
return p.tokens[p.token_idx - 2]
}
[inline] fn (p &Parser) cur_tok() Token {
return p.tokens[p.token_idx - 1]
}
[inline] fn (p &Parser) peek_token() Token {
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if p.token_idx >= p.tokens.len - 2 {
return Token{ tok:TokenKind.eof }
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}
return p.tokens[p.token_idx]
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}
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fn (p &Parser) log(s string) {
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/*
if !p.pref.is_verbose {
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return
}
println(s)
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*/
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}
fn (p mut Parser) parse(pass Pass) {
p.cgen.line = 0
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p.cgen.file = cescaped_path(os.realpath(p.file_path))
/////////////////////////////////////
p.pass = pass
p.token_idx = 0
p.next()
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//p.log('\nparse() run=$p.pass file=$p.file_name tok=${p.strtok()}')// , "script_file=", script_file)
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// `module main` is not required if it's a single file program
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if p.pref.is_script || p.pref.is_test {
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// User may still specify `module main`
if p.tok == .key_module {
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p.next()
p.fgen('module ')
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p.mod = p.check_name()
} else {
p.mod = 'main'
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}
}
else {
p.check(.key_module)
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p.fspace()
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p.mod = p.check_name()
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}
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//
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p.cgen.nogen = false
if p.pref.build_mode == .build_module && p.mod != p.v.mod {
//println('skipping $p.mod (v.mod = $p.v.mod)')
p.cgen.nogen = true
//defer { p.cgen.nogen = false }
}
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p.fgenln('\n')
p.builtin_mod = p.mod == 'builtin'
p.can_chash = p.mod=='ui' || p.mod == 'darwin'// TODO tmp remove
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// Import pass - the first and the smallest pass that only analyzes imports
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// if we are a building module get the full module name from v.mod
fq_mod := if p.pref.build_mode == .build_module && p.v.mod.ends_with(p.mod) {
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p.v.mod
}
// fully qualify the module name, eg base64 to encoding.base64
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else {
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p.table.qualify_module(p.mod, p.file_path)
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}
p.table.register_module(fq_mod)
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p.mod = fq_mod
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if p.pass == .imports {
for p.tok == .key_import && p.peek() != .key_const {
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p.imports()
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}
if 'builtin' in p.table.imports {
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p.error('module `builtin` cannot be imported')
}
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return
}
// Go through every top level token or throw a compilation error if a non-top level token is met
for {
match p.tok {
.key_import {
if p.peek() == .key_const {
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p.const_decl()
}
else {
// TODO remove imported consts from the language
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p.imports()
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if p.tok != .key_import {
p.fgenln('')
}
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}
}
.key_enum {
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p.next()
if p.tok == .name {
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p.fgen('enum ')
name := p.check_name()
p.fgen(' ')
p.enum_decl(name)
}
else if p.pref.translated {
// enum without a name, only allowed in code,
// translated from C. it's a very bad practice
// in C as well, but is used unfortunately
// (for example, by DOOM). such fields are
// basically int consts
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p.enum_decl('int')
}
else {
p.check(.name)
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}
}
.key_pub {
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next := p.peek()
match next {
.key_fn { p.fn_decl() }
.key_const { p.const_decl() }
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.key_struct, .key_union, .key_interface { p.struct_decl() }
.key_enum { p.enum_decl('') }
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else {
p.error('wrong pub keyword usage')
}
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}
}
.key_fn {
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p.fn_decl()
}
.key_type {
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p.type_decl()
}
.lsbr {
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// `[` can only mean an [attribute] before a function
// or a struct definition
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p.attribute()
}
.key_struct, .key_interface, .key_union, .lsbr {
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p.struct_decl()
}
.key_const {
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p.const_decl()
}
.hash {
// insert C code (only for ui module)
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// # puts("hello");
p.chash()
}
.dollar {
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// $if, $else
p.comp_time()
}
.key_global {
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if !p.pref.translated && !p.pref.is_live &&
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!p.builtin_mod && !p.pref.building_v && !os.getwd().contains('/volt') {
p.error('__global is only allowed in translated code')
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}
p.next()
name := p.check_name()
typ := p.get_type()
p.register_global(name, typ)
// p.genln(p.table.cgen_name_type_pair(name, typ))
mut g := p.table.cgen_name_type_pair(name, typ)
if p.tok == .assign {
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p.next()
g += ' = '
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_, expr := p.tmp_expr()
g += expr
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}
// p.genln('; // global')
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g += '; // global'
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if !p.cgen.nogen {
p.cgen.consts << g
}
}
.eof {
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//p.log('end of parse()')
// TODO: check why this was added? everything seems to work
// without it, and it's already happening in fn_decl
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// if p.pref.is_script && !p.pref.is_test {
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// p.set_current_fn( MainFn )
// p.check_unused_variables()
// }
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if !p.first_pass() && !p.pref.is_repl {
p.check_unused_imports()
}
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if false && !p.first_pass() && p.fileis('main.v') {
out := os.create('/var/tmp/fmt.v') or {
verror('failed to create fmt.v')
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return
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}
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out.writeln(p.scanner.fmt_out.str())
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out.close()
}
return
}
else {
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// no `fn main`, add this "global" statement to cgen.fn_main
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if p.pref.is_script && !p.pref.is_test {
// cur_fn is empty since there was no fn main declared
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// we need to set it to save and find variables
if p.cur_fn.name == '' {
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p.set_current_fn( MainFn )
if p.pref.is_repl {
if p.first_pass() {
return
}
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p.clear_vars()
}
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}
mut start := p.cgen.lines.len
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p.statement(true)
if start > 0 && p.cgen.lines[start - 1] != '' && p.cgen.fn_main != '' {
start--
}
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p.genln('')
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end := p.cgen.lines.len
lines := p.cgen.lines.slice(start, end)
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//mut line := p.cgen.fn_main + lines.join('\n')
//line = line.trim_space()
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p.cgen.fn_main = p.cgen.fn_main + lines.join('\n')
p.cgen.resetln('')
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for i := start; i < end; i++ {
p.cgen.lines[i] = ''
}
}
else {
p.error('unexpected token `${p.strtok()}`')
}
}
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}
}
}
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fn (p mut Parser) imports() {
p.check(.key_import)
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// `import ()`
if p.tok == .lpar {
p.check(.lpar)
for p.tok != .rpar && p.tok != .eof {
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p.import_statement()
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}
p.check(.rpar)
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return
}
// `import foo`
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p.import_statement()
}
fn (p mut Parser) import_statement() {
if p.tok != .name {
p.error('bad import format')
}
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if p.peek() == .number {
p.error('bad import format. module/submodule names cannot begin with a number')
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}
import_tok_idx := p.token_idx-1
mut mod := p.check_name().trim_space()
mut mod_alias := mod
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// submodule support
mut depth := 1
for p.tok == .dot {
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p.check(.dot)
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submodule := p.check_name()
mod_alias = submodule
mod += '.' + submodule
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depth++
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if depth > MaxModuleDepth {
p.error('module depth of $MaxModuleDepth exceeded: $mod')
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}
}
// aliasing (import encoding.base64 as b64)
if p.tok == .key_as && p.peek() == .name {
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p.check(.key_as)
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mod_alias = p.check_name()
}
// add import to file scope import table
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p.register_import_alias(mod_alias, mod, import_tok_idx)
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// Make sure there are no duplicate imports
if mod in p.table.imports {
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return
}
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//p.log('adding import $mod')
p.table.imports << mod
p.table.register_module(mod)
p.fgenln(' ' + mod)
}
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fn (p mut Parser) const_decl() {
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is_pub := p.tok == .key_pub
if is_pub {
p.next()
}
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p.inside_const = true
p.check(.key_const)
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p.fspace()
p.check(.lpar)
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p.fgenln('')
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p.fmt_inc()
for p.tok == .name {
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if p.lit == '_' && p.peek() == .assign && !p.cgen.nogen {
p.gen_blank_identifier_assign()
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//if !p.cgen.nogen {
p.cgen.consts_init << p.cgen.cur_line.trim_space()
p.cgen.resetln('')
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//}
continue
}
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mut name := p.check_name() // `Age = 20`
//if !p.pref.building_v && p.mod != 'os' && contains_capital(name) {
//p.warn('const names cannot contain uppercase letters, use snake_case instead')
//}
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name = p.prepend_mod(name)
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mut typ := ''
if p.is_vh {
// .vh files don't have const values, just types: `const (a int)`
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if p.tok == .assign {
p.next()
typ = p.expression()
} else {
typ = p.get_type()
}
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p.table.register_const(name, typ, p.mod, is_pub)
p.cgen.consts << ('extern ' +
p.table.cgen_name_type_pair(name, typ)) + ';'
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continue // Don't generate C code when building a .vh file
} else {
p.check_space(.assign)
typ = p.expression()
}
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if p.first_pass() && p.table.known_const(name) {
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p.error('redefinition of `$name`')
}
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if p.first_pass() {
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p.table.register_const(name, typ, p.mod, is_pub)
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}
// Check to see if this constant exists, and is void. If so, try and get the type again:
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if my_const := p.v.table.find_const(name) {
if my_const.typ == 'void' {
for i, v in p.v.table.consts {
if v.name == name {
p.v.table.consts[i].typ = typ
break
}
}
}
}
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if p.pass == .main && !p.cgen.nogen {
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// TODO hack
// cur_line has const's value right now. if it's just a number, then optimize generation:
// output a #define so that we don't pollute the binary with unnecessary global vars
// Do not do this when building a module, otherwise the consts
// will not be accessible.
if p.pref.build_mode != .build_module && is_compile_time_const(p.cgen.cur_line) {
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p.cgen.consts << '#define $name $p.cgen.cur_line'
p.cgen.resetln('')
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p.fgenln('')
continue
}
if typ.starts_with('[') {
p.cgen.consts << p.table.cgen_name_type_pair(name, typ) +
' = $p.cgen.cur_line;'
}
else {
p.cgen.consts << p.table.cgen_name_type_pair(name, typ) + ';'
p.cgen.consts_init << '$name = $p.cgen.cur_line;'
}
p.cgen.resetln('')
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}
p.fgenln('')
}
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p.fmt_dec()
p.check(.rpar)
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p.fgenln('\n')
p.inside_const = false
}
// `type myint int`
// `type onclickfn fn(voidptr) int`
fn (p mut Parser) type_decl() {
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p.check(.key_type)
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name := p.check_name()
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// V used to have 'type Foo struct', many Go users might use this syntax
if p.tok == .key_struct {
p.error('use `struct $name {` instead of `type $name struct {`')
}
parent := p.get_type2()
nt_pair := p.table.cgen_name_type_pair(name, parent.name)
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// TODO dirty C typedef hacks for DOOM
// Unknown type probably means it's a struct, and it's used before the struct is defined,
// so specify "struct"
_struct := if parent.cat != .array && parent.cat != .func &&
!p.table.known_type(parent.name) {
'struct'
} else {
''
}
p.gen_typedef('typedef $_struct $nt_pair; //type alias name="$name" parent=`$parent.name`')
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p.table.register_type2(Type{
name: name
parent: parent.name
mod: p.mod
cat: TypeCategory.alias
})
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}
// current token is `(`
fn (p mut Parser) interface_method(field_name, receiver string) &Fn {
mut method := &Fn {
name: field_name
is_interface: true
is_method: true
receiver_typ: receiver
}
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//p.log('is interface. field=$field_name run=$p.pass')
p.fn_args(mut method)
prev_tok := p.prev_token()
cur_tok := p.cur_tok()
// No type on the same line, this method doesn't return a type, process next
if prev_tok.line_nr != cur_tok.line_nr {
method.typ = 'void'
} else {
method.typ = p.get_type()// method return type
p.fspace()
p.fgenln('')
}
return method
}
fn key_to_type_cat(tok TokenKind) TypeCategory {
match tok {
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.key_interface { return .interface_ }
.key_struct { return .struct_ }
.key_union { return .union_ }
//TokenKind.key_ => return .interface_
}
verror('Unknown token: $tok')
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return .builtin
}
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// check_name checks for a name token and returns its literal
fn (p mut Parser) check_name() string {
name := p.lit
p.check(.name)
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return name
}
fn (p mut Parser) check_string() string {
s := p.lit
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p.check(.str)
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return s
}
fn (p &Parser) strtok() string {
if p.tok == .name {
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return p.lit
}
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if p.tok == .str {
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return '"$p.lit"'
}
res := p.tok.str()
if res == '' {
n := int(p.tok)
return n.str()
}
return res
}
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// same as check(), but adds a space to the formatter output
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// TODO bad name
fn (p mut Parser) check_space(expected TokenKind) {
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p.fspace()
p.check(expected)
p.fspace()
}
fn (p mut Parser) check(expected TokenKind) {
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if p.tok != expected {
println('check()')
s := 'expected `${expected.str()}` but got `${p.strtok()}`'
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p.next()
println('next token = `${p.strtok()}`')
print_backtrace()
p.error(s)
}
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/*
if expected == .rcbr {
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p.fmt_dec()
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}
p.fgen(p.strtok())
// vfmt: increase indentation on `{` unless it's `{}`
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// TODO
if expected == .lcbr && p.scanner.pos + 1 < p.scanner.text.len && p.scanner.text[p.scanner.pos + 1] != `}` {
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p.fgenln('')
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p.fmt_inc()
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}
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*/
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p.next()
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//if p.scanner.line_comment != '' {
//p.fgenln('// ! "$p.scanner.line_comment"')
//p.scanner.line_comment = ''
//}
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}
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[inline]
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fn (p &Parser) first_pass() bool {
return p.pass == .decl
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}
// TODO return Type instead of string?
fn (p mut Parser) get_type() string {
mut mul := false
mut nr_muls := 0
mut typ := ''
// multiple returns
if p.tok == .lpar {
// if p.inside_tuple {p.error('unexpected (')}
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// p.inside_tuple = true
p.check(.lpar)
mut types := []string
for {
types << p.get_type()
if p.tok != .comma {
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break
}
p.check(.comma)
}
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p.check(.rpar)
// p.inside_tuple = false
typ = p.register_multi_return_stuct(types)
return typ
}
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// fn type
if p.tok == .key_fn {
mut f := Fn{name: '_', mod: p.mod}
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p.next()
line_nr := p.scanner.line_nr
p.fn_args(mut f)
// Same line, it's a return type
if p.scanner.line_nr == line_nr {
if p.tok in [TokenKind.name, .mul, .amp, .lsbr, .question, .lpar] {
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f.typ = p.get_type()
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}
else {
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f.typ = 'void'
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}
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// println('fn return typ=$f.typ')
}
else {
f.typ = 'void'
}
// Register anon fn type
fn_typ := Type {
name: f.typ_str()// 'fn (int, int) string'
mod: p.mod
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func: f
}
p.table.register_type2(fn_typ)
return f.typ_str()
}
// arrays ([]int)
mut arr_level := 0
is_question := p.tok == .question
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if is_question {
p.check(.question)
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}
for p.tok == .lsbr {
p.check(.lsbr)
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// [10]int
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if p.tok == .number {
typ += '[$p.lit]'
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p.next()
}
else {
arr_level++
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}
p.check(.rsbr)
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}
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// map[string]int
if !p.builtin_mod && p.tok == .name && p.lit == 'map' {
p.next()
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p.check(.lsbr)
key_type := p.check_name()
if key_type != 'string' {
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p.error('maps only support string keys for now')
}
p.check(.rsbr)
val_type := p.get_type()// p.check_name()
typ = 'map_$val_type'
p.register_map(typ)
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return typ
}
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// ptr/ref
mut warn := false
for p.tok == .mul {
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if p.first_pass() {
warn = true
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}
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mul = true
nr_muls++
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p.check(.mul)
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}
if p.tok == .amp {
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mul = true
nr_muls++
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p.check(.amp)
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}
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// Generic type check
ti := p.cur_fn.dispatch_of.inst
if p.lit in ti.keys() {
typ += ti[p.lit]
// println('cur dispatch: $p.lit => $typ')
} else {
typ += p.lit
}
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if !p.is_struct_init {
// Otherwise we get `foo := FooFoo{` because `Foo` was already
// generated in name_expr()
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p.fgen(p.lit)
}
// C.Struct import
if p.lit == 'C' && p.peek() == .dot {
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p.next()
p.check(.dot)
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typ = p.lit
}
else {
if warn && p.mod != 'ui' {
p.warn('use `&Foo` instead of `*Foo`')
}
// Module specified? (e.g. gx.Image)
if p.peek() == .dot {
// try resolve full submodule
if !p.builtin_mod && p.import_table.known_alias(typ) {
mod := p.import_table.resolve_alias(typ)
if mod.contains('.') {
typ = mod_gen_name(mod)
}
}
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p.next()
p.check(.dot)
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typ += '__$p.lit'
}
mut t := p.table.find_type(typ)
// "typ" not found? try "mod__typ"
if t.name == '' && !p.builtin_mod {
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// && !p.first_pass() {
if !typ.contains('array_') && p.mod != 'main' && !typ.contains('__') &&
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!typ.starts_with('[') {
typ = p.prepend_mod(typ)
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}
t = p.table.find_type(typ)
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if t.name == '' && !p.pref.translated && !p.first_pass() && !typ.starts_with('[') {
2019-06-22 21:20:28 +03:00
println('get_type() bad type')
// println('all registered types:')
// for q in p.table.types {
// println(q.name)
// }
p.error('unknown type `$typ`')
}
}
2019-10-24 19:44:49 +03:00
else if !t.is_public && t.mod != p.mod && t.name != '' && !p.first_pass() {
p.error('type `$t.name` is private')
2019-10-24 12:47:21 +03:00
}
2019-06-22 21:20:28 +03:00
}
if typ == 'void' {
p.error('unknown type `$typ`')
}
if mul {
typ += strings.repeat(`*`, nr_muls)
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}
// Register an []array type
if arr_level > 0 {
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// p.log('ARR TYPE="$typ" run=$p.pass')
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// We come across "[]User" etc ?
for i := 0; i < arr_level; i++ {
typ = 'array_$typ'
}
2019-06-22 21:20:28 +03:00
p.register_array(typ)
}
p.next()
if is_question {
2019-06-22 21:20:28 +03:00
typ = 'Option_$typ'
p.table.register_type_with_parent(typ, 'Option')
}
// Because the code uses * to see if it's a pointer
if typ == 'byteptr' {
return 'byte*'
}
if typ == 'voidptr' {
//if !p.builtin_mod && p.mod != 'os' && p.mod != 'gx' && p.mod != 'gg' && !p.pref.translated {
2019-06-22 21:20:28 +03:00
//p.error('voidptr can only be used in unsafe code')
//}
return 'void*'
}
if typ.last_index('__') > typ.index('__') {
p.error('2 __ in gettype(): typ="$typ"')
}
return typ
}
fn (p &Parser) print_tok() {
if p.tok == .name {
2019-06-22 21:20:28 +03:00
println(p.lit)
return
}
2019-07-16 18:59:07 +03:00
if p.tok == .str {
2019-06-22 21:20:28 +03:00
println('"$p.lit"')
return
}
println(p.tok.str())
}
// statements() returns the type of the last statement
fn (p mut Parser) statements() string {
2019-09-23 23:18:55 +03:00
//p.log('statements()')
2019-07-24 03:35:25 +03:00
typ := p.statements_no_rcbr()
2019-06-22 21:20:28 +03:00
if !p.inside_if_expr {
p.genln('}')
}
2019-07-24 03:35:25 +03:00
//if p.fileis('if_expr') {
//println('statements() ret=$typ line=$p.scanner.line_nr')
//}
2019-06-22 21:20:28 +03:00
return typ
}
2019-07-24 03:35:25 +03:00
fn (p mut Parser) statements_no_rcbr() string {
p.open_scope()
2019-08-27 00:39:11 +03:00
2019-06-22 21:20:28 +03:00
if !p.inside_if_expr {
p.genln('')
}
mut i := 0
mut last_st_typ := ''
2019-10-27 14:05:50 +03:00
for p.tok != .rcbr && p.tok != .eof {
2019-10-20 10:19:37 +03:00
// println('stm: '+p.tok.str()+', next: '+p.peek().str())
2019-06-22 21:20:28 +03:00
last_st_typ = p.statement(true)
// println('last st typ=$last_st_typ')
if !p.inside_if_expr {
p.genln('')// // end st tok= ${p.strtok()}')
p.fgenln('')
}
i++
if i > 50000 {
p.cgen.save()
p.error('more than 50 000 statements in function `$p.cur_fn.name`')
}
}
// p.next()
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p.check(.rcbr)
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//p.fmt_dec()
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p.close_scope()
2019-06-22 21:20:28 +03:00
return last_st_typ
}
fn (p mut Parser) close_scope() {
// println('close_scope level=$f.scope_level var_idx=$f.var_idx')
2019-09-08 18:53:40 +03:00
// Move back `var_idx` (pointer to the end of the array) till we reach
// the previous scope level. This effectivly deletes (closes) current
// scope.
2019-09-23 20:34:08 +03:00
mut i := p.var_idx - 1
2019-08-02 06:20:18 +03:00
for ; i >= 0; i-- {
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v := p.local_vars[i]
2019-09-27 18:55:30 +03:00
if v.scope_level != p.cur_fn.scope_level {
break
}
2019-09-14 18:54:55 +03:00
// Clean up memory, only do this if -autofree was passed for now
if p.pref.autofree && v.is_alloc { // && !p.pref.is_test {
mut free_fn := 'free'
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if v.typ.starts_with('array_') {
free_fn = 'v_array_free'
} else if v.typ == 'string' {
free_fn = 'v_string_free'
//if p.fileis('str.v') {
//println('freeing str $v.name')
//}
2019-10-02 15:31:03 +03:00
continue
} else if v.ptr || v.typ.ends_with('*') {
free_fn = 'v_ptr_free'
//continue
} else {
continue
}
if p.returns {
// Don't free a variable that's being returned
if !v.is_returned && v.typ != 'FILE*' { //!v.is_c {
prev_line := p.cgen.lines[p.cgen.lines.len-2]
p.cgen.lines[p.cgen.lines.len-2] =
'$free_fn($v.name); /* :) close_scope free $v.typ */' + prev_line
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}
} else {
p.genln('$free_fn($v.name); // close_scope free')
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}
}
}
if p.cur_fn.defer_text.last() != '' {
p.genln(p.cur_fn.defer_text.last())
//p.cur_fn.defer_text[f] = ''
}
p.cur_fn.scope_level--
p.cur_fn.defer_text = p.cur_fn.defer_text[..p.cur_fn.scope_level + 1]
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p.var_idx = i + 1
// println('close_scope new var_idx=$f.var_idx\n')
}
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fn (p mut Parser) genln(s string) {
p.cgen.genln(s)
}
fn (p mut Parser) gen(s string) {
p.cgen.gen(s)
}
// Generate V header from V source
fn (p mut Parser) statement(add_semi bool) string {
p.expected_type = ''
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if p.returns && !p.is_vweb {
p.error('unreachable code')
}
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// if !p.in_dispatch {
p.cgen.is_tmp = false
// }
2019-06-22 21:20:28 +03:00
tok := p.tok
mut q := ''
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match tok {
.name {
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next := p.peek()
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//if p.pref.is_verbose {
//println(next.str())
//}
2019-06-22 21:20:28 +03:00
// goto_label:
if p.peek() == .colon {
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p.fmt_dec()
label := p.check_name()
p.fmt_inc()
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p.genln(label + ': ;')
p.check(.colon)
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return ''
}
2019-09-23 20:34:08 +03:00
// `a := 777`
else if p.peek() == .decl_assign || p.peek() == .comma {
2019-09-23 23:18:55 +03:00
//p.log('var decl')
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p.var_decl()
}
// `_ = 777`
else if p.lit == '_' && p.peek() == .assign {
p.gen_blank_identifier_assign()
}
2019-06-22 21:20:28 +03:00
else {
// panic and exit count as returns since they stop the function
if p.lit == 'panic' || p.lit == 'exit' {
p.returns = true
}
// `a + 3`, `a(7)`, or just `a`
2019-06-22 21:20:28 +03:00
q = p.bool_expression()
}
2019-10-24 16:02:24 +03:00
}
.key_goto {
p.check(.key_goto)
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p.fgen(' ')
label := p.check_name()
p.genln('goto $label;')
return ''
2019-10-24 16:02:24 +03:00
}
.key_defer {
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p.defer_st()
return ''
2019-10-24 16:02:24 +03:00
}
.hash {
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p.chash()
return ''
2019-10-24 16:02:24 +03:00
}
.key_unsafe {
p.next()
p.inside_unsafe = true
p.check(.lcbr)
p.genln('{')
p.statements()
p.inside_unsafe = false
//p.check(.rcbr)
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}
.dollar {
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p.comp_time()
2019-10-24 16:02:24 +03:00
}
.key_if {
p.if_st(false, 0)
2019-10-24 16:02:24 +03:00
}
.key_for {
2019-06-22 21:20:28 +03:00
p.for_st()
2019-10-24 16:02:24 +03:00
}
.key_switch {
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p.switch_statement()
2019-10-24 16:02:24 +03:00
}
.key_match {
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p.match_statement(false)
2019-10-24 16:02:24 +03:00
}
.key_mut, .key_static {
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p.var_decl()
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}
.key_return {
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p.return_st()
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}
.lcbr {// {} block
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p.check(.lcbr)
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p.genln('{')
p.statements()
return ''
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}
.key_continue {
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if p.for_expr_cnt == 0 {
p.error('`continue` statement outside `for`')
}
p.genln('continue')
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p.check(.key_continue)
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}
.key_break {
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if p.for_expr_cnt == 0 {
p.error('`break` statement outside `for`')
}
p.genln('break')
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p.check(.key_break)
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}
.key_go {
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p.go_statement()
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}
.key_assert {
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p.assert_statement()
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}
else {
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// An expression as a statement
typ := p.expression()
if p.inside_if_expr {
}
else {
p.genln('; ')
}
return typ
}
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}
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// ? : uses , as statement separators
if p.inside_if_expr && p.tok != .rcbr {
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p.gen(', ')
}
if add_semi && !p.inside_if_expr {
p.genln(';')
}
return q
// p.cgen.end_statement()
}
// is_map: are we in map assignment? (m[key] = val) if yes, dont generate '='
// this can be `user = ...` or `user.field = ...`, in both cases `v` is `user`
fn (p mut Parser) assign_statement(v Var, ph int, is_map bool) {
errtok := p.cur_tok_index()
//p.log('assign_statement() name=$v.name tok=')
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is_vid := p.fileis('vid') // TODO remove
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tok := p.tok
//if !v.is_mut && !v.is_arg && !p.pref.translated && !v.is_global{
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if !v.is_mut && !p.pref.translated && !v.is_global && !is_vid {
if v.is_arg {
if p.cur_fn.args.len > 0 && p.cur_fn.args[0].name == v.name {
println('make the receiver `$v.name` mutable:
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fn ($v.name mut $v.typ) $p.cur_fn.name (...) {
')
}
}
p.error('`$v.name` is immutable')
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}
if !v.is_changed {
p.mark_var_changed(v)
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}
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is_str := v.typ == 'string'
is_ustr := v.typ == 'ustring'
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match tok {
.assign {
if !is_map && !p.is_empty_c_struct_init {
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p.gen(' = ')
}
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}
.plus_assign {
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if is_str && !p.is_js {
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p.gen('= string_add($v.name, ')// TODO can't do `foo.bar += '!'`
}
else if is_ustr {
p.gen('= ustring_add($v.name, ')
}
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else {
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p.gen(' += ')
}
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}
else {
p.gen(' ' + p.tok.str() + ' ')
}
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}
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p.fspace()
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p.fgen(tok.str())
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p.fspace()
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p.next()
pos := p.cgen.cur_line.len
expr_type := p.bool_expression()
//if p.expected_type.starts_with('array_') {
//p.warn('expecting array got $expr_type')
//}
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// Allow `num = 4` where `num` is an `?int`
if p.assigned_type.starts_with('Option_') &&
expr_type == p.assigned_type['Option_'.len..] {
expr := p.cgen.cur_line[pos..]
left := p.cgen.cur_line[..pos]
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typ := expr_type.replace('Option_', '')
p.cgen.resetln(left + 'opt_ok($expr, sizeof($typ))')
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}
else if expr_type[0]==`[` {
// assignment to a fixed_array `mut a:=[3]int a=[1,2,3]!!`
expr := p.cgen.cur_line[pos..].all_after('{').all_before('}')
left := p.cgen.cur_line[..pos].all_before('=')
cline_pos := p.cgen.cur_line[pos..]
etype := cline_pos.all_before(' {')
if p.assigned_type != p.expected_type {
p.error_with_token_index( 'incompatible types: $p.assigned_type != $p.expected_type', errtok)
}
p.cgen.resetln('memcpy( (& $left), ($etype{$expr}), sizeof( $left ) );')
}
else if !p.builtin_mod && !p.check_types_no_throw(expr_type, p.assigned_type) {
p.error_with_token_index( 'cannot use type `$expr_type` as type `$p.assigned_type` in assignment', errtok)
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}
if (is_str || is_ustr) && tok == .plus_assign && !p.is_js {
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p.gen(')')
}
// p.assigned_var = ''
p.assigned_type = ''
if !v.is_used {
p.mark_var_used(v)
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}
}
fn (p mut Parser) var_decl() {
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p.is_alloc = false
is_mut := p.tok == .key_mut || p.prev_tok == .key_for
is_static := p.tok == .key_static
if p.tok == .key_mut {
p.check(.key_mut)
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p.fspace()
}
if p.tok == .key_static {
p.check(.key_static)
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p.fspace()
}
mut var_token_idxs := [p.cur_tok_index()]
mut var_mut := [is_mut] // add first var mut
mut var_names := [p.check_name()] // add first variable
p.scanner.validate_var_name(var_names[0])
mut new_vars := 0
if var_names[0] != '_' && !p.known_var(var_names[0]) {
new_vars++
}
// more than 1 vars (multiple returns)
for p.tok == .comma {
p.check(.comma)
if p.tok == .key_mut {
p.check(.key_mut)
var_mut << true
} else {
var_mut << false
}
var_token_idxs << p.cur_tok_index()
var_name := p.check_name()
p.scanner.validate_var_name(var_name)
if var_name != '_' && !p.known_var(var_name) {
new_vars++
}
var_names << var_name
}
is_assign := p.tok == .assign
is_decl_assign := p.tok == .decl_assign
if is_assign {
p.check_space(.assign) // =
} else if is_decl_assign {
p.check_space(.decl_assign) // :=
} else {
p.error('expected `=` or `:=`')
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}
// all vars on left of `:=` already defined (or `_`)
if is_decl_assign && var_names.len == 1 && var_names[0] == '_' {
p.error_with_token_index('use `=` instead of `:=`', var_token_idxs.last())
}
p.var_decl_name = if var_names.len > 1 { '_V_mret_'+var_names.join('_') } else { var_names[0] }
t := p.gen_var_decl(p.var_decl_name, is_static)
mut var_types := [t]
// multiple returns types
if var_names.len > 1 {
var_types = t.replace('_V_MulRet_', '').replace('_PTR_', '*').split('_V_')
}
// mismatched number of return & assignment vars
if var_names.len != var_types.len {
mr_fn := p.cgen.cur_line.find_between('=', '(').trim_space()
p.error_with_token_index('assignment mismatch: ${var_names.len} variables but `$mr_fn` returns $var_types.len values', var_token_idxs.last())
}
for i, var_name in var_names {
var_token_idx := var_token_idxs[i]
var_is_mut := var_mut[i]
var_type := var_types[i]
known_var := p.known_var(var_name)
if var_name == '_' {
if var_is_mut {
p.error_with_token_index('`mut` has no effect here', var_token_idx-1)
}
continue
}
// println('var decl tok=${p.strtok()} name=type=$var_name type=$var_type ismut=$var_is_mut')
// var decl, already exists (shadowing is not allowed)
// Don't allow declaring a variable with the same name. Even in a child scope
// if var_names.len == 1 && !p.builtin_mod && known_var {
if is_decl_assign && known_var {
p.error_with_token_index('redefinition of `$var_name`', var_token_idx)
}
// mut specified with assignment
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//if /*is_assign && implicit*/ known_var && var_is_mut {
if known_var && var_is_mut {
p.error_with_token_index('cannot specify mutability for existing var `$var_name`, only for new vars', var_token_idx)
}
// assignment, but var does not exist
if is_assign && !known_var {
suggested := p.find_misspelled_local_var(var_name, 50)
if suggested != '' {
p.error_with_token_index('undefined: `$var_name`. did you mean:$suggested', var_token_idx)
}
p.error_with_token_index('undefined: `$var_name`.', var_token_idx)
}
if var_name.len > 1 && contains_capital(var_name) {
p.error_with_token_index('variable names cannot contain uppercase letters, use snake_case instead', var_token_idx)
}
// multiple return
if var_names.len > 1 {
p.gen(';\n')
// assigment
// if !p.builtin_mod && known_var {
if known_var {
v := p.find_var(var_name) or {
p.error_with_token_index('cannot find `$var_name`', var_token_idx)
break
}
p.check_types_with_token_index(var_type, v.typ, var_token_idx)
if !v.is_mut {
p.error_with_token_index('`$v.name` is immutable', var_token_idx)
}
p.mark_var_used(v)
p.mark_var_changed(v)
p.gen('$var_name = ${p.var_decl_name}.var_$i')
continue
}
// decleration
p.gen('$var_type $var_name = ${p.var_decl_name}.var_$i')
}
p.register_var(Var {
name: var_name
typ: var_type
is_mut: var_is_mut
is_alloc: p.is_alloc || var_type.starts_with('array_')
line_nr: p.tokens[ var_token_idx ].line_nr
token_idx: var_token_idx
})
//if p.fileis('str.v') {
//if p.is_alloc { println('REG VAR IS ALLOC $name') }
//}
}
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p.var_decl_name = ''
p.is_empty_c_struct_init = false
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}
const (
and_or_error = 'use `()` to make the boolean expression clear\n' +
'for example: `(a && b) || c` instead of `a && b || c`'
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)
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fn (p mut Parser) bool_expression() string {
tok := p.tok
typ := p.bterm()
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mut got_and := false // to catch `a && b || c` in one expression without ()
mut got_or := false
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for p.tok == .and || p.tok == .logical_or {
if p.tok == .and {
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got_and = true
if got_or { p.error(and_or_error) }
}
if p.tok == .logical_or {
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got_or = true
if got_and { p.error(and_or_error) }
}
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if p.is_sql {
if p.tok == .and {
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p.gen(' and ')
}
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else if p.tok == .logical_or {
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p.gen(' or ')
}
} else {
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p.gen(' ${p.tok.str()} ')
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}
p.check_space(p.tok)
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p.check_types(p.bterm(), typ)
}
if typ == '' {
println('curline:')
println(p.cgen.cur_line)
println(tok.str())
p.error('expr() returns empty type')
}
return typ
}
fn (p mut Parser) bterm() string {
ph := p.cgen.add_placeholder()
mut typ := p.expression()
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p.expected_type = typ
is_str := typ=='string' && !p.is_sql
is_ustr := typ=='ustring'
is_float := typ[0] == `f` && (typ in ['f64', 'f32']) &&
!(p.cur_fn.name in ['f64_abs', 'f32_abs']) &&
!(p.cur_fn.name == 'eq')
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is_array := typ.contains('array_')
expr_type := typ
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tok := p.tok
if tok in [.eq, .gt, .lt, .le, .ge, .ne] {
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//TODO: remove when array comparing is supported
if is_array {
p.error('Array comparing is not supported yet')
}
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p.fgen(' ${p.tok.str()} ')
if (is_float || is_str || is_ustr) && !p.is_js {
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p.gen(',')
}
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else if p.is_sql && tok == .eq {
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p.gen('=')
}
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else {
p.gen(tok.str())
}
p.next()
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// `id == user.id` => `id == $1`, `user.id`
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if p.is_sql {
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p.sql_i++
p.gen('$' + p.sql_i.str())
p.cgen.start_cut()
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p.check_types(p.expression(), typ)
sql_param := p.cgen.cut()
p.sql_params << sql_param
p.sql_types << typ
//println('*** sql type: $typ | param: $sql_param')
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} else {
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p.check_types(p.expression(), typ)
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}
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typ = 'bool'
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if is_str && !p.is_js { //&& !p.is_sql {
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p.gen(')')
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match tok {
.eq { p.cgen.set_placeholder(ph, 'string_eq(') }
.ne { p.cgen.set_placeholder(ph, 'string_ne(') }
.le { p.cgen.set_placeholder(ph, 'string_le(') }
.ge { p.cgen.set_placeholder(ph, 'string_ge(') }
.gt { p.cgen.set_placeholder(ph, 'string_gt(') }
.lt { p.cgen.set_placeholder(ph, 'string_lt(') }
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}
}
if is_ustr {
p.gen(')')
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match tok {
.eq { p.cgen.set_placeholder(ph, 'ustring_eq(') }
.ne { p.cgen.set_placeholder(ph, 'ustring_ne(') }
.le { p.cgen.set_placeholder(ph, 'ustring_le(') }
.ge { p.cgen.set_placeholder(ph, 'ustring_ge(') }
.gt { p.cgen.set_placeholder(ph, 'ustring_gt(') }
.lt { p.cgen.set_placeholder(ph, 'ustring_lt(') }
}
}
if is_float && p.cur_fn.name != 'f32_abs' && p.cur_fn.name != 'f64_abs' {
p.gen(')')
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match tok {
.eq { p.cgen.set_placeholder(ph, '${expr_type}_eq(') }
.ne { p.cgen.set_placeholder(ph, '${expr_type}_ne(') }
.le { p.cgen.set_placeholder(ph, '${expr_type}_le(') }
.ge { p.cgen.set_placeholder(ph, '${expr_type}_ge(') }
.gt { p.cgen.set_placeholder(ph, '${expr_type}_gt(') }
.lt { p.cgen.set_placeholder(ph, '${expr_type}_lt(') }
}
}
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}
return typ
}
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// also called on *, &, @, . (enum)
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fn (p mut Parser) name_expr() string {
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//println('n')
p.has_immutable_field = false
p.is_const_literal = false
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ph := p.cgen.add_placeholder()
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// amp
ptr := p.tok == .amp
deref := p.tok == .mul
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if ptr || deref {
p.next()
}
mut name := p.lit
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// Raw string (`s := r'hello \n ')
if name == 'r' && p.peek() == .str {
p.string_expr()
return 'string'
}
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p.fgen(name)
// known_type := p.table.known_type(name)
orig_name := name
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is_c := name == 'C' && p.peek() == .dot
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if is_c {
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p.check(.name)
p.check(.dot)
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name = p.lit
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// C struct initialization
if p.peek() == .lcbr && p.table.known_type(name) {
return p.get_struct_type(name, true, ptr)
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}
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// C function
if p.peek() == .lpar {
return p.get_c_func_type(name)
}
// C const (`C.GLFW_KEY_LEFT`)
p.gen(name)
p.next()
return 'int'
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}
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// enum value? (`color == .green`)
if p.tok == .dot {
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if p.table.known_type(p.expected_type) {
p.check_enum_member_access()
// println("found enum value: $p.expected_type")
return p.expected_type
} else {
p.error("unknown enum: `$p.expected_type`")
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}
}
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// Variable, checked before modules, so module shadowing is allowed.
// (`gg = gg.newcontext(); gg.draw_rect(...)`)
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if p.known_var_check_new_var(name) {
rtyp := p.get_var_type(name, ptr, deref)
return rtyp
}
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// Module?
if p.peek() == .dot && ((name == p.mod && p.table.known_mod(name)) ||
p.import_table.known_alias(name)) && !is_c {
mut mod := name
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// must be aliased module
if name != p.mod && p.import_table.known_alias(name) {
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p.import_table.register_used_import(name)
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mod = p.import_table.resolve_alias(name)
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}
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p.next()
p.check(.dot)
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name = p.lit
p.fgen(name)
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name = prepend_mod(mod_gen_name(mod), name)
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}
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// Unknown name, try prepending the module name to it
// TODO perf
else if !p.table.known_type(name) &&
!p.table.known_fn(name) && !p.table.known_const(name) && !is_c
{
name = p.prepend_mod(name)
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}
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// re-check
if p.known_var_check_new_var(name) {
return p.get_var_type(name, ptr, deref)
}
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// if known_type || is_c_struct_init || (p.first_pass() && p.peek() == .lcbr) {
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// known type? int(4.5) or Color.green (enum)
if p.table.known_type(name) {
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// cast expression: float(5), byte(0), (*int)(ptr) etc
if !is_c && ( p.peek() == .lpar || (deref && p.peek() == .rpar) ) {
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if deref {
name += '*'
}
else if ptr {
name += '*'
}
p.gen('(')
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mut typ := name
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if typ in p.cur_fn.dispatch_of.inst.keys() {
typ = p.cur_fn.dispatch_of.inst[typ]
}
p.cast(typ)
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p.gen(')')
for p.tok == .dot {
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typ = p.dot(typ, ph)
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}
return typ
}
// Color.green
else if p.peek() == .dot {
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enum_type := p.table.find_type(name)
if enum_type.cat != .enum_ {
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p.error('`$name` is not an enum')
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}
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p.next()
p.check(.dot)
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val := p.lit
if !enum_type.has_enum_val(val) {
p.error('enum `$enum_type.name` does not have value `$val`')
}
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// println('enum val $val')
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p.gen(mod_gen_name(enum_type.mod) + '__' + enum_type.name + '_' + val)// `color = main__Color_green`
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p.next()
return enum_type.name
}
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// normal struct init (non-C)
else if p.peek() == .lcbr {
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return p.get_struct_type(name, false, ptr)
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}
}
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// Constant
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if p.table.known_const(name) {
return p.get_const_type(name, ptr)
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}
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// Function (not method, methods are handled in `.dot()`)
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mut f := p.table.find_fn_is_script(name, p.v_script) or {
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return p.get_undefined_fn_type(name, orig_name)
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}
// no () after func, so func is an argument, just gen its name
// TODO verify this and handle errors
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peek := p.peek()
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if peek != .lpar && peek != .lt {
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// Register anon fn type
fn_typ := Type {
name: f.typ_str()// 'fn (int, int) string'
mod: p.mod
func: f
}
p.table.register_type2(fn_typ)
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p.gen(p.table.fn_gen_name(f))
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p.next()
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return f.typ_str() //'void*'
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}
// TODO bring back
if f.typ == 'void' && !p.inside_if_expr {
// p.error('`$f.name` used as value')
}
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// println('call to fn $f.name of type $f.typ')
// TODO replace the following dirty hacks (needs ptr access to fn table)
new_f := f
p.fn_call(mut new_f, 0, '', '')
if f.is_generic {
f2 := p.table.find_fn(f.name) or {
return ''
}
// println('after call of generic instance $new_f.name(${new_f.str_args(p.table)}) $new_f.typ')
// println(' from $f2.name(${f2.str_args(p.table)}) $f2.typ : $f2.type_inst')
}
f = new_f
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// dot after a function call: `get_user().age`
if p.tok == .dot {
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mut typ := ''
for p.tok == .dot {
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// println('dot #$dc')
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typ = p.dot(f.typ, ph)
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}
return typ
}
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//p.log('end of name_expr')
if f.typ.ends_with('*') {
p.is_alloc = true
}
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return f.typ
}
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fn (p mut Parser) get_struct_type(name_ string, is_c bool, is_ptr bool) string {
mut name := name_
if is_ptr {
name += '*' // `&User{}` => type `User*`
}
if name in reserved_type_param_names {
p.warn('name `$name` is reserved for type parameters')
}
p.is_c_struct_init = is_c
return p.struct_init(name)
}
fn (p mut Parser) get_var_type(name string, is_ptr bool, is_deref bool) string {
v := p.find_var_check_new_var(name) or { return "" }
if name == '_' {
p.error('cannot use `_` as value')
}
if is_ptr {
p.gen('&')
}
else if is_deref {
p.gen('*')
}
if p.pref.autofree && v.typ == 'string' && v.is_arg &&
p.assigned_type == 'string' {
p.warn('setting moved ' + v.typ)
p.mark_arg_moved(v)
}
mut typ := p.var_expr(v)
// *var
if is_deref {
if !typ.contains('*') && !typ.ends_with('ptr') {
println('name="$name", t=$v.typ')
p.error('dereferencing requires a pointer, but got `$typ`')
}
typ = typ.replace('ptr', '')// TODO
typ = typ.replace('*', '')// TODO
}
// &var
else if is_ptr {
typ += '*'
}
if p.inside_return_expr {
//println('marking $v.name returned')
p.mark_var_returned(v)
// v.is_returned = true // TODO modifying a local variable
// that's not used afterwards, this should be a compilation
// error
}
return typ
}
fn (p mut Parser) get_const_type(name string, is_ptr bool) string {
c := p.table.find_const(name) or { return "" }
if is_ptr && !c.is_global {
p.error('cannot take the address of constant `$c.name`')
} else if is_ptr && c.is_global {
// c.ptr = true
p.gen('& /*const*/ ')
}
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if !c.is_public && c.mod != p.mod {
p.warn('constant `$c.name` is private')
}
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mut typ := p.var_expr(c)
if is_ptr {
typ += '*'
}
return typ
}
fn (p mut Parser) get_c_func_type(name string) string {
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//p.warn(name + ' ' + p.expected_type)
//}
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f := Fn {
name: name
is_c: true
}
p.is_c_fn_call = true
p.fn_call(mut f, 0, '', '')
p.is_c_fn_call = false
// Try looking it up. Maybe its defined with "C.fn_name() fn_type",
// then we know what type it returns
cfn := p.table.find_fn(name) or {
// Not Found? Return 'void*'
//return 'cvoid' //'void*'
//if p.expected_type != '' && p.expected_type != 'void' {
//p.warn('\n e=$p.expected_type define imported C function with ' +
//'`fn C.$name([args]) [return_type]`\n')
//}
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return 'void*'
}
// println("C fn $name has type $cfn.typ")
return cfn.typ
}
fn (p mut Parser) get_undefined_fn_type(name string, orig_name string) string {
if p.first_pass() {
p.next()
// First pass, the function can be defined later.
return 'void'
} else {
// We are in the second pass, that means this function was not defined, throw an error.
// V script? Try os module.
// TODO
if p.v_script {
//name = name.replace('main__', 'os__')
//f = p.table.find_fn(name)
}
// check for misspelled function / variable / module
name_dotted := mod_gen_name_rev(name.replace('__', '.'))
suggested := p.identify_typo(name)
if suggested.len != 0 {
p.error('undefined: `$name_dotted`. did you mean:\n$suggested\n')
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}
// If orig_name is a mod, then printing undefined: `mod` tells us nothing
// if p.table.known_mod(orig_name) {
if p.table.known_mod(orig_name) || p.import_table.known_alias(orig_name) {
m_name := mod_gen_name_rev(name.replace('__', '.'))
p.error('undefined function: `$m_name` (in module `$orig_name`)')
} else if orig_name in reserved_type_param_names {
p.error('the letter `$orig_name` is reserved for type parameters')
} else {
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p.error('undefined: `$orig_name`')
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}
return 'void'
}
}
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fn (p mut Parser) var_expr(v Var) string {
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//p.log('\nvar_expr() v.name="$v.name" v.typ="$v.typ"')
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// println('var expr is_tmp=$p.cgen.is_tmp\n')
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if !v.is_const {
p.mark_var_used(v)
}
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fn_ph := p.cgen.add_placeholder()
p.expr_var = v
p.gen(p.table.var_cgen_name(v.name))
p.next()
mut typ := v.typ
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// Function pointer?
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if typ.starts_with('fn ') && p.tok == .lpar {
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T := p.table.find_type(typ)
p.gen('(')
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p.fn_call_args(mut T.func)
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p.gen(')')
typ = T.func.typ
}
// users[0].name
if p.tok == .lsbr {
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typ = p.index_expr(typ, fn_ph)
}
// a.b.c().d chain
// mut dc := 0
for p.tok ==.dot {
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if p.peek() == .key_select {
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p.next()
return p.select_query(fn_ph)
}
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if typ == 'pg__DB' && !p.fileis('pg.v') && p.peek() == .name {
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p.next()
p.insert_query(fn_ph)
return 'void'
}
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// println('dot #$dc')
typ = p.dot(typ, fn_ph)
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//p.log('typ after dot=$typ')
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// print('tok after dot()')
// p.print_tok()
// dc++
if p.tok == .lsbr {
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// typ = p.index_expr(typ, fn_ph, v)
}
}
// a++ and a--
if p.tok == .inc || p.tok == .dec {
if !v.is_mut && !v.is_arg && !p.pref.translated {
2019-07-10 15:18:21 +03:00
p.error('`$v.name` is immutable')
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}
if !v.is_changed {
p.mark_var_changed(v)
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}
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if typ != 'int' {
if !p.pref.translated && !is_number_type(typ) {
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p.error('cannot ++/-- value of type `$typ`')
}
}
p.gen(p.tok.str())
p.fgen(p.tok.str())
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p.next()// ++/--
// allow `a := c++` in translated code
if p.pref.translated {
//return p.index_expr(typ, fn_ph)
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}
else {
return 'void'
}
}
typ = p.index_expr(typ, fn_ph)
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// TODO hack to allow `foo.bar[0] = 2`
if p.tok == .dot {
for p.tok == .dot {
typ = p.dot(typ, fn_ph)
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}
typ = p.index_expr(typ, fn_ph)
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}
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return typ
}
// user.name => `str_typ` is `User`
// user.company.name => `str_typ` is `Company`
fn (p mut Parser) dot(str_typ_ string, method_ph int) string {
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//if p.fileis('orm_test') {
//println('ORM dot $str_typ')
//}
mut str_typ := str_typ_
p.check(.dot)
is_variadic_arg := str_typ.starts_with('...')
if is_variadic_arg { str_typ = str_typ[3..] }
mut typ := p.find_type(str_typ)
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if typ.name.len == 0 {
p.error('dot(): cannot find type `$str_typ`')
}
if p.tok == .dollar {
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p.comptime_method_call(typ)
return 'void'
}
field_name := p.lit
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if field_name == 'filter' && str_typ.starts_with('array_') {
p.gen_array_filter(str_typ, method_ph)
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return str_typ
}
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else if field_name == 'map' && str_typ.starts_with('array_') {
return p.gen_array_map(str_typ, method_ph)
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}
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fname_tidx := p.cur_tok_index()
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p.fgen(field_name)
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//p.log('dot() field_name=$field_name typ=$str_typ')
//if p.fileis('main.v') {
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//println('dot() field_name=$field_name typ=$str_typ prev_tok=${prev_tok.str()}')
//}
has_field := p.table.type_has_field(typ, p.table.var_cgen_name(field_name))
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mut has_method := p.table.type_has_method(typ, field_name)
if is_variadic_arg && field_name == 'len' {
p.gen('->$field_name')
p.next()
return 'int'
}
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// generate `.str()`
if !has_method && field_name == 'str' && typ.name.starts_with('array_') {
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p.gen_array_str(typ)
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has_method = true
}
if !typ.is_c && !p.is_c_fn_call && !has_field && !has_method && !p.first_pass() {
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if typ.name.starts_with('Option_') {
opt_type := typ.name[7..]
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p.error('unhandled option type: `?$opt_type`')
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}
//println('error in dot():')
//println('fields:')
//for field in typ.fields {
//println(field.name)
//}
//println('methods:')
//for field in typ.methods {
//println(field.name)
//}
//println('str_typ=="$str_typ"')
p.error_with_token_index('type `$typ.name` has no field or method `$field_name`', fname_tidx)
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}
mut dot := '.'
if str_typ.ends_with('*') || str_typ == 'FT_Face' { // TODO fix C ptr typedefs
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dot = dot_ptr
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}
// field
if has_field {
struct_field := if typ.name != 'Option' { p.table.var_cgen_name(field_name) } else { field_name }
field := p.table.find_field(typ, struct_field) or {
p.error_with_token_index('missing field: $struct_field in type $typ.name', fname_tidx)
exit(1)
}
if !field.is_mut && !p.has_immutable_field {
p.has_immutable_field = true
p.first_immutable_field = field
}
2019-06-22 21:20:28 +03:00
// Is the next token `=`, `+=` etc? (Are we modifying the field?)
next := p.peek()
modifying := next.is_assign() || next == .inc || next == .dec ||
(field.typ.starts_with('array_') && next == .left_shift)
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if !p.builtin_mod && !p.pref.translated && modifying &&
p.has_immutable_field {
f := p.first_immutable_field
p.error_with_token_index('cannot modify immutable field `$f.name` (type `$f.parent_fn`)\n' +
'declare the field with `mut:`
struct $f.parent_fn {
mut:
$f.name $f.typ
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}
', fname_tidx)
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}
// Don't allow `arr.data`
2019-10-25 16:34:12 +03:00
if field.access_mod == .private && !p.builtin_mod && !p.pref.translated && p.mod != typ.mod && !p.is_vgen {
2019-06-22 21:20:28 +03:00
// println('$typ.name :: $field.name ')
// println(field.access_mod)
p.error_with_token_index('cannot refer to unexported field `$struct_field` (type `$typ.name`)\n' +
'declare the field with `pub:`
struct $typ.name {
pub:
$struct_field $field.typ
}
', fname_tidx)
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}
p.gen(dot + struct_field)
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p.next()
return field.typ
}
// method
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method := p.table.find_method(typ, field_name) or {
p.error_with_token_index('could not find method `$field_name`', fname_tidx) // should never happen
2019-09-18 15:37:34 +03:00
exit(1)
}
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p.fn_call(mut method, method_ph, '', str_typ)
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// Methods returning `array` should return `array_string` etc
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if method.typ == 'array' && typ.name.starts_with('array_') {
return typ.name
}
// Array methods returning `voidptr` (like `last()`) should return element type
2019-06-22 21:20:28 +03:00
if method.typ == 'void*' && typ.name.starts_with('array_') {
return typ.name[6..]
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}
//if false && p.tok == .lsbr {
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// if is_indexer {
//return p.index_expr(method.typ, method_ph)
//}
if method.typ.ends_with('*') {
p.is_alloc = true
}
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return method.typ
}
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enum IndexType {
noindex
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str
map
array
array0
fixed_array
ptr
}
fn get_index_type(typ string) IndexType {
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if typ.starts_with('map_') { return .map }
if typ == 'string' { return .str }
if typ.starts_with('array_') || typ == 'array' { return .array }
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if typ == 'byte*' || typ == 'byteptr' || typ.contains('*') {
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return .ptr
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}
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if typ[0] == `[` { return .fixed_array }
return .noindex
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}
fn (p mut Parser) index_expr(typ_ string, fn_ph int) string {
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mut typ := typ_
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// a[0]
v := p.expr_var
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//if p.fileis('fn_test.v') {
//println('index expr typ=$typ')
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//println(v.name)
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//}
is_variadic_arg := typ.starts_with('...')
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is_map := typ.starts_with('map_')
is_str := typ == 'string'
is_arr0 := typ.starts_with('array_')
is_arr := is_arr0 || typ == 'array'
is_ptr := typ == 'byte*' || typ == 'byteptr' || typ.contains('*')
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mut is_slice := false
is_indexer := p.tok == .lsbr
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mut close_bracket := false
index_error_tok_pos := p.token_idx
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if is_indexer {
is_fixed_arr := typ[0] == `[`
if !is_str && !is_arr && !is_map && !is_ptr && !is_fixed_arr && !is_variadic_arg {
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p.error('Cant [] non-array/string/map. Got type "$typ"')
}
p.check(.lsbr)
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// Get element type (set `typ` to it)
if is_str {
typ = 'byte'
p.fgen('[')
// Direct faster access to .str[i] in builtin modules
if p.builtin_mod {
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p.gen('.str[')
close_bracket = true
}
else {
// Bounds check everywhere else
p.gen(',')
}
}
if is_fixed_arr {
// `[10]int` => `int`, `[10][3]int` => `[3]int`
if typ.contains('][') {
pos := typ.index_after('[', 1)
typ = typ[pos..]
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}
else {
typ = typ.all_after(']')
}
p.gen('[')
close_bracket = true
}
else if is_ptr && !is_variadic_arg {
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// typ = 'byte'
typ = typ.replace('*', '')
// modify(mut []string) fix
if !is_arr {
p.gen('[/*ptr*/')
close_bracket = true
}
}
if is_arr {
if is_arr0 {
typ = typ[6..]
}
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p.gen_array_at(typ, is_arr0, fn_ph)
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}
// map is tricky
// need to replace "m[key] = val" with "tmp = val; map_set(&m, key, &tmp)"
// need to replace "m[key]" with "tmp = val; map_get(&m, key, &tmp)"
// can only do that later once we know whether there's an "=" or not
if is_map {
typ = typ.replace('map_', '')
if typ == 'map' {
typ = 'void*'
}
p.gen(',')
}
// expression inside [ ]
if is_arr || is_str {
// [2..
if p.tok != .dotdot {
index_pos := p.cgen.cur_line.len
T := p.table.find_type(p.expression())
// Allows only i8-64 and byte-64 to be used when accessing an array
if T.parent != 'int' && T.parent != 'u32' {
p.check_types(T.name, 'int')
}
if p.cgen.cur_line[index_pos..].replace(' ', '').int() < 0 {
p.error('cannot access negative array index')
}
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}
// [..
else {
p.gen('0')
}
2019-10-26 21:58:26 +03:00
if p.tok == .dotdot {
if is_arr {
typ = 'array_' + typ
} else if is_str {
typ = 'string'
} else {
p.error('slicing is supported by arrays and strings only')
}
is_slice = true
p.next()
p.gen(',')
// ..4]
if p.tok != .rsbr {
p.check_types(p.expression(), 'int')
p.gen(', false')
}
// ..]
else {
p.gen('-1, true')
}
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}
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}
else {
T := p.table.find_type(p.expression())
// TODO: Get the key type of the map instead of only string.
if is_map && T.parent != 'string' {
p.check_types(T.name, 'string')
}
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}
p.check(.rsbr)
// if (is_str && p.builtin_mod) || is_ptr || is_fixed_arr && ! (is_ptr && is_arr) {
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if close_bracket {
p.gen(']/*r$typ $v.is_mut*/')
}
p.expr_var = v
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}
// accessing variadiac args
if is_variadic_arg {
// TODO: why was this here?
// if p.calling_c {
// p.error('you cannot currently pass varg to a C function.')
// }
if is_indexer {
l := p.cgen.cur_line.trim_space()
index_val := l.right(l.last_index(' ')).trim_space()
p.cgen.resetln(l[..fn_ph])
p.table.varg_access << VargAccess{
fn_name: p.cur_fn.name,
tok_idx: index_error_tok_pos,
index: index_val.int()
}
p.cgen.set_placeholder(fn_ph, '${v.name}->args[$index_val]')
return typ
}
}
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// `m[key] = val`
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// TODO move this from index_expr()
if (p.tok == .assign && !p.is_sql) || p.tok.is_assign() {
if is_indexer && is_str && !p.builtin_mod {
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p.error('strings are immutable')
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}
p.assigned_type = typ
p.expected_type = typ
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assign_pos := p.cgen.cur_line.len
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is_cao := p.tok != .assign
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p.assign_statement(v, fn_ph, is_indexer && (is_map || is_arr))
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// `m[key] = val`
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if is_indexer && (is_map || is_arr) {
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p.gen_array_set(typ, is_ptr, is_map, fn_ph, assign_pos, is_cao)
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}
return typ
}
// else if p.pref.is_verbose && p.assigned_var != '' {
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// p.error('didnt assign')
// }
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// `m[key]`. no =, just a getter
else if (is_map || is_arr || (is_str && !p.builtin_mod)) && is_indexer {
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p.index_get(typ, fn_ph, IndexConfig{
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is_arr: is_arr
is_map: is_map
is_ptr: is_ptr
is_str: is_str
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is_slice: is_slice
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})
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}
// else if is_arr && is_indexer{}
return typ
}
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struct IndexConfig {
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is_map bool
is_str bool
is_ptr bool
is_arr bool
is_arr0 bool
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is_slice bool
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}
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// for debugging only
fn (p &Parser) fileis(s string) bool {
return p.scanner.file_path.contains(s)
}
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// in and dot have higher priority than `!`
fn (p mut Parser) indot_expr() string {
ph := p.cgen.add_placeholder()
mut typ := p.term()
if p.tok == .dot {
for p.tok == .dot {
typ = p.dot(typ, ph)
}
}
// `a in [1, 2, 3]`
// `key in map`
if p.tok == .key_in {
p.fgen(' ')
p.check(.key_in)
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p.expected_type = typ // this allows `foo in [.val1, .val2, .val3]`
if p.tok == .lsbr {
// a in [1,2,3] optimization => `a == 1 || a == 2 || a == 3`
// avoids an allocation
p.in_optimization(typ, ph)
return 'bool'
}
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p.fgen(' ')
p.gen('), ')
arr_typ := p.expression()
is_map := arr_typ.starts_with('map_')
if !arr_typ.starts_with('array_') && !is_map {
p.error('`in` requires an array/map')
}
T := p.table.find_type(arr_typ)
if !is_map && !T.has_method('contains') {
p.error('$arr_typ has no method `contains`')
}
// `typ` is element's type
if is_map {
p.cgen.set_placeholder(ph, '_IN_MAP( (')
}
else {
p.cgen.set_placeholder(ph, '_IN($typ, (')
}
p.gen(')')
return 'bool'
}
return typ
}
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// returns resulting type
fn (p mut Parser) expression() string {
p.is_const_literal = true
//if p.scanner.file_path.contains('test_test') {
//println('expression() pass=$p.pass tok=')
//p.print_tok()
//}
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ph := p.cgen.add_placeholder()
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mut typ := p.indot_expr()
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is_str := typ=='string'
is_ustr := typ=='ustring'
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// `a << b` ==> `array_push(&a, b)`
if p.tok == .left_shift {
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if typ.contains('array_') {
// Can't pass integer literal, because push requires a void*
// a << 7 => int tmp = 7; array_push(&a, &tmp);
// _PUSH(&a, expression(), tmp, string)
tmp := p.get_tmp()
tmp_typ := typ[6..]// skip "array_"
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p.check_space(.left_shift)
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// Get the value we are pushing
p.gen(', (')
// Immutable? Can we push?
if !p.expr_var.is_mut && !p.pref.translated {
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p.error('`$p.expr_var.name` is immutable (can\'t <<)')
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}
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if p.expr_var.is_arg && p.expr_var.typ.starts_with('array_') {
p.error("for now it's not possible to append an element to "+
'a mutable array argument `$p.expr_var.name`')
}
if !p.expr_var.is_changed {
p.mark_var_changed(p.expr_var)
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}
p.gen('/*typ = $typ tmp_typ=$tmp_typ*/')
ph_clone := p.cgen.add_placeholder()
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expr_type := p.expression()
// Need to clone the string when appending it to an array?
if p.pref.autofree && typ == 'array_string' && expr_type == 'string' {
p.cgen.set_placeholder(ph_clone, 'string_clone(')
p.gen(')')
}
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p.gen_array_push(ph, typ, expr_type, tmp, tmp_typ)
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return 'void'
}
else {
p.next()
p.gen(' << ')
p.check_types(p.expression(), typ)
return 'int'
}
}
if p.tok == .righ_shift {
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p.next()
p.gen(' >> ')
p.check_types(p.expression(), typ)
return 'int'
}
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// + - | ^
for p.tok in [TokenKind.plus, .minus, .pipe, .amp, .xor] {
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tok_op := p.tok
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if typ == 'bool' {
p.error('operator ${p.tok.str()} not defined on bool ')
}
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is_num := typ == 'void*' || typ == 'byte*' || is_number_type(typ)
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p.check_space(p.tok)
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if is_str && tok_op == .plus && !p.is_js {
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p.cgen.set_placeholder(ph, 'string_add(')
p.gen(',')
}
else if is_ustr && tok_op == .plus {
p.cgen.set_placeholder(ph, 'ustring_add(')
p.gen(',')
}
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// 3 + 4
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else if is_num || p.is_js {
if typ == 'void*' {
// Msvc errors on void* pointer arithmatic
// ... So cast to byte* and then do the add
p.cgen.set_placeholder(ph, '(byte*)')
}
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p.gen(tok_op.str())
}
// Vec + Vec
else {
if p.pref.translated {
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p.gen(tok_op.str() + ' /*doom hack*/')// TODO hack to fix DOOM's angle_t
}
else {
p.gen(',')
}
}
p.check_types(p.term(), typ)
if (is_str || is_ustr) && tok_op == .plus && !p.is_js {
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p.gen(')')
}
// Make sure operators are used with correct types
if !p.pref.translated && !is_str && !is_ustr && !is_num {
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T := p.table.find_type(typ)
if tok_op == .plus {
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if T.has_method('+') {
p.cgen.set_placeholder(ph, typ + '_plus(')
p.gen(')')
}
else {
p.error('operator + not defined on `$typ`')
}
}
else if tok_op == .minus {
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if T.has_method('-') {
p.cgen.set_placeholder(ph, '${typ}_minus(')
p.gen(')')
}
else {
p.error('operator - not defined on `$typ`')
}
}
}
}
return typ
}
fn (p mut Parser) term() string {
line_nr := p.scanner.line_nr
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//if p.fileis('fn_test') {
//println('\nterm() $line_nr')
//}
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typ := p.unary()
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//if p.fileis('fn_test') {
//println('2: $line_nr')
//}
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// `*` on a newline? Can't be multiplication, only dereference
if p.tok == .mul && line_nr != p.scanner.line_nr {
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return typ
}
for p.tok == .mul || p.tok == .div || p.tok == .mod {
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tok := p.tok
is_div := tok == .div
is_mod := tok == .mod
// is_mul := tok == .mod
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p.next()
p.gen(tok.str())// + ' /*op2*/ ')
p.fgen(' ' + tok.str() + ' ')
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if (is_div || is_mod) && p.tok == .number && p.lit == '0' {
p.error('division or modulo by zero')
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}
if is_mod && (is_float_type(typ) || !is_number_type(typ)) {
p.error('operator .mod requires integer types')
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}
p.check_types(p.unary(), typ)
}
return typ
}
fn (p mut Parser) unary() string {
mut typ := ''
tok := p.tok
match tok {
.not {
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p.gen('!')
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p.check(.not)
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// typ should be bool type
typ = p.indot_expr()
if typ != 'bool' {
p.error('operator ! requires bool type, not `$typ`')
}
}
.bit_not {
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p.gen('~')
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p.check(.bit_not)
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typ = p.bool_expression()
}
else {
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typ = p.factor()
}
}
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return typ
}
fn (p mut Parser) factor() string {
mut typ := ''
tok := p.tok
match tok {
.key_none {
if !p.expected_type.starts_with('Option_') {
p.error('need "$p.expected_type" got none')
}
p.gen('opt_none()')
p.check(.key_none)
return p.expected_type
}
.number {
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typ = 'int'
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// Check if float (`1.0`, `1e+3`) but not if is hexa
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if (p.lit.contains('.') || (p.lit.contains('e') || p.lit.contains('E'))) &&
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!(p.lit[0] == `0` && (p.lit[1] == `x` || p.lit[1] == `X`)) {
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typ = 'f32'
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// typ = 'f64' // TODO
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} else {
v_u64 := p.lit.u64()
if u64(u32(v_u64)) < v_u64 {
typ = 'u64'
}
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}
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if p.expected_type != '' && !is_valid_int_const(p.lit, p.expected_type) {
p.error('constant `$p.lit` overflows `$p.expected_type`')
}
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p.gen(p.lit)
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p.fgen(p.lit)
}
.minus {
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p.gen('-')
p.fgen('-')
p.next()
return p.factor()
// Variable
}
.key_sizeof {
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p.gen('sizeof(')
p.fgen('sizeof(')
p.next()
p.check(.lpar)
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mut sizeof_typ := p.get_type()
p.check(.rpar)
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p.gen('$sizeof_typ)')
p.fgen('$sizeof_typ)')
return 'int'
}
.amp, .dot, .mul {
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// (dot is for enum vals: `.green`)
2019-06-22 21:20:28 +03:00
return p.name_expr()
}
.name {
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// map[string]int
if p.lit == 'map' && p.peek() == .lsbr {
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return p.map_init()
}
if p.lit == 'json' && p.peek() == .dot {
if !('json' in p.table.imports) {
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p.error('undefined: `json`, use `import json`')
}
2019-09-23 13:42:20 +03:00
p.import_table.register_used_import('json')
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return p.js_decode()
}
2019-08-17 22:19:37 +03:00
//if p.fileis('orm_test') {
//println('ORM name: $p.lit')
//}
2019-06-22 21:20:28 +03:00
typ = p.name_expr()
return typ
}
2019-10-27 14:05:50 +03:00
/*
.key_default {
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p.next()
p.next()
name := p.check_name()
if name != 'T' {
p.error('default needs T')
}
p.gen('default(T)')
p.next()
return 'T'
}
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*/
.lpar {
//p.gen('(/*lpar*/')
p.gen('(')
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p.check(.lpar)
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typ = p.bool_expression()
// Hack. If this `)` referes to a ptr cast `(*int__)__`, it was already checked
// TODO: fix parser so that it doesn't think it's a par expression when it sees `(` in
// __(__*int)(
if !p.ptr_cast {
p.check(.rpar)
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}
p.ptr_cast = false
p.gen(')')
return typ
}
.chartoken {
2019-06-22 21:20:28 +03:00
p.char_expr()
typ = 'byte'
return typ
}
.str {
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p.string_expr()
typ = 'string'
return typ
}
.key_false {
2019-06-22 21:20:28 +03:00
typ = 'bool'
p.gen('0')
p.fgen('false')
}
.key_true {
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typ = 'bool'
p.gen('1')
p.fgen('true')
}
.lsbr {
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// `[1,2,3]` or `[]` or `[20]byte`
// TODO have to return because arrayInit does next()
// everything should do next()
return p.array_init()
}
.lcbr {
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// `m := { 'one': 1 }`
2019-08-03 10:44:08 +03:00
if p.peek() == .str {
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return p.map_init()
}
2019-06-22 21:20:28 +03:00
// { user | name :'new name' }
return p.assoc()
}
.key_if {
typ = p.if_st(true, 0)
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return typ
}
.key_match {
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typ = p.match_statement(true)
return typ
}
else {
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if p.pref.is_verbose || p.pref.is_debug {
next := p.peek()
println('prev=${p.prev_tok.str()}')
println('next=${next.str()}')
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}
2019-06-22 21:20:28 +03:00
p.error('unexpected token: `${p.tok.str()}`')
}
}
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p.next()// TODO everything should next()
return typ
}
// { user | name: 'new name' }
fn (p mut Parser) assoc() string {
// println('assoc()')
p.next()
name := p.check_name()
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var := p.find_var(name) or {
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p.error('unknown variable `$name`')
exit(1)
}
p.mark_var_used(var)
p.check(.pipe)
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p.gen('($var.typ){')
mut fields := []string// track the fields user is setting, the rest will be copied from the old object
for p.tok != .rcbr {
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field := p.check_name()
fields << field
p.gen('.$field = ')
p.check(.colon)
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p.bool_expression()
p.gen(',')
if p.tok != .rcbr {
p.check(.comma)
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}
}
// Copy the rest of the fields
T := p.table.find_type(var.typ)
for ffield in T.fields {
f := ffield.name
if f in fields {
continue
}
p.gen('.$f = $name . $f,')
}
p.check(.rcbr)
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p.gen('}')
return var.typ
}
fn (p mut Parser) char_expr() {
p.gen('\'$p.lit\'')
p.next()
}
fn format_str(_str string) string {
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// TODO don't call replace 3 times for every string, do this in scanner.v
mut str := _str.replace('"', '\\"')
str = str.replace('\r\n', '\\n')
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str = str.replace('\n', '\\n')
return str
}
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fn (p mut Parser) string_expr() {
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is_raw := p.tok == .name && p.lit == 'r'
if is_raw {
p.next()
}
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str := p.lit
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// No ${}, just return a simple string
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if p.peek() != .dollar || is_raw {
p.fgen("'$str'")
f := if is_raw { cescaped_path(str) } else { format_str(str) }
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// `C.puts('hi')` => `puts("hi");`
/*
Calling a C function sometimes requires a call to a string method
C.fun('ssss'.to_wide()) => fun(string_to_wide(tos2((byte*)('ssss'))))
*/
if (p.calling_c && p.peek() != .dot) || (p.pref.translated && p.mod == 'main') {
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p.gen('"$f"')
}
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else if p.is_sql {
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p.gen("'$str'")
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}
2019-09-14 23:48:30 +03:00
else if p.is_js {
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p.gen('tos("$f")')
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}
2019-06-22 21:20:28 +03:00
else {
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p.gen('tos3("$f")')
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}
p.next()
return
}
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$if js {
p.error('js backend does not support string formatting yet')
}
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p.is_alloc = true // $ interpolation means there's allocation
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mut args := '"'
mut format := '"'
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p.fgen('\'')
mut complex_inter := false // for vfmt
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for p.tok == .str {
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// Add the string between %d's
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p.fgen(p.lit)
p.lit = p.lit.replace('%', '%%')
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format += format_str(p.lit)
p.next()// skip $
if p.tok != .dollar {
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continue
}
// Handle .dollar
2019-08-17 22:19:37 +03:00
p.check(.dollar)
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// If there's no string after current token, it means we are in
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// a complex expression (`${...}`)
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if p.peek() != .str {
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p.fgen('{')
complex_inter = true
}
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// Get bool expr inside a temp var
p.cgen.start_tmp()
typ := p.bool_expression()
mut val := p.cgen.end_tmp()
val = val.trim_space()
args += ', $val'
if typ == 'string' {
// args += '.str'
// printf("%.*s", a.len, a.str) syntax
args += '.len, ${val}.str'
}
if typ == 'ustring' {
args += '.len, ${val}.s.str'
}
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if typ == 'bool' {
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//args += '.len, ${val}.str'
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}
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// Custom format? ${t.hour:02d}
custom := p.tok == .colon
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if custom {
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mut cformat := ''
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p.next()
if p.tok == .dot {
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cformat += '.'
p.next()
}
if p.tok == .minus { // support for left aligned formatting
cformat += '-'
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p.next()
}
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cformat += p.lit// 02
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p.next()
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fspec := p.lit // f
cformat += fspec
if fspec == 's' {
//println('custom str F=$cformat | format_specifier: "$fspec" | typ: $typ ')
if typ != 'string' {
p.error('only V strings can be formatted with a :${cformat} format, but you have given "${val}", which has type ${typ}')
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}
args = args.all_before_last('${val}.len, ${val}.str') + '${val}.str'
}
format += '%$cformat'
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p.next()
}
else {
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f := p.typ_to_fmt(typ, 0)
if f == '' {
is_array := typ.starts_with('array_')
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typ2 := p.table.find_type(typ)
has_str_method := p.table.type_has_method(typ2, 'str')
if is_array || has_str_method {
if is_array && !has_str_method {
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p.gen_array_str(typ2)
}
tmp_var := p.get_tmp()
p.cgen.insert_before('string $tmp_var = ${typ}_str(${val});')
args = args.all_before_last(val) + '${tmp_var}.len, ${tmp_var}.str'
format += '%.*s '
}
else {
p.error('unhandled sprintf format "$typ" ')
}
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}
format += f
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}
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//println('interpolation format is: |${format}| args are: |${args}| ')
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}
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if complex_inter {
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p.fgen('}')
}
p.fgen('\'')
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// println("hello %d", num) optimization.
if p.cgen.nogen {
return
}
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// println: don't allocate a new string, just print it.
$if !windows {
cur_line := p.cgen.cur_line.trim_space()
if cur_line == 'println (' && p.tok != .plus {
p.cgen.resetln(cur_line.replace('println (', 'printf('))
p.gen('$format\\n$args')
return
}
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}
// '$age'! means the user wants this to be a tmp string (uses global buffer, no allocation,
// won't be used again)
// TODO remove this hack, do this automatically
if p.tok == .not {
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p.check(.not)
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p.gen('_STR_TMP($format$args)')
}
else {
// Otherwise do len counting + allocation + sprintf
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p.gen('_STR($format$args)')
}
}
// m := map[string]int{}
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// m := { 'one': 1 }
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fn (p mut Parser) map_init() string {
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// m := { 'one': 1, 'two': 2 }
mut keys_gen := '' // (string[]){tos2("one"), tos2("two")}
mut vals_gen := '' // (int[]){1, 2}
mut val_type := '' // 'int'
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if p.tok == .lcbr {
p.check(.lcbr)
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mut i := 0
for {
key := p.lit
keys_gen += 'tos3("$key"), '
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p.check(.str)
p.check(.colon)
p.cgen.start_tmp()
t := p.bool_expression()
if i == 0 {
val_type = t
}
i++
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if val_type != t {
if !p.check_types_no_throw(val_type, t) {
p.error('bad map element type `$val_type` instead of `$t`')
}
}
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val_expr := p.cgen.end_tmp()
vals_gen += '$val_expr, '
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if p.tok == .rcbr {
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p.check(.rcbr)
break
}
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if p.tok == .comma {
p.check(.comma)
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}
}
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p.gen('new_map_init($i, sizeof($val_type), ' +
'(string[$i]){ $keys_gen }, ($val_type [$i]){ $vals_gen } )')
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typ := 'map_$val_type'
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p.register_map(typ)
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return typ
}
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p.next()
p.check(.lsbr)
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key_type := p.check_name()
if key_type != 'string' {
p.error('only string key maps allowed for now')
}
p.check(.rsbr)
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val_type = p.get_type()/// p.check_name()
//if !p.table.known_type(val_type) {
//p.error('map init unknown type "$val_type"')
//}
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typ := 'map_$val_type'
p.register_map(typ)
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p.gen('new_map(1, sizeof($val_type))')
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if p.tok == .lcbr {
p.check(.lcbr)
p.check(.rcbr)
println('warning: $p.file_name:$p.scanner.line_nr ' +
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'initializaing maps no longer requires `{}`')
}
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return typ
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}
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// `nums := [1, 2, 3]`
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fn (p mut Parser) array_init() string {
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p.is_alloc = true
p.check(.lsbr)
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mut is_integer := p.tok == .number // for `[10]int`
// fixed length arrays with a const len: `nums := [N]int`, same as `[10]int` basically
mut is_const_len := false
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if p.tok == .name && !p.inside_const {
const_name := p.prepend_mod(p.lit)
if p.table.known_const(const_name) {
c := p.table.find_const(const_name) or {
//p.error('unknown const `$p.lit`')
exit(1)
}
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if c.typ == 'int' && p.peek() == .rsbr { //&& !p.inside_const {
is_integer = true
is_const_len = true
} else {
p.error('bad fixed size array const `$p.lit`')
}
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}
}
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lit := p.lit
mut typ := ''
new_arr_ph := p.cgen.add_placeholder()
mut i := 0
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pos := p.cgen.cur_line.len// remember cur line to fetch first number in cgen for [0; 10]
for p.tok != .rsbr {
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val_typ := p.bool_expression()
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// Get the type of the first expression
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if i == 0 {
typ = val_typ
// fixed width array initialization? (`arr := [20]byte`)
if is_integer && p.tok == .rsbr && p.peek() == .name &&
p.cur_tok().line_nr == p.peek_token().line_nr {
// there is no space between `[10]` and `byte`
if p.cur_tok().col + p.peek_token().lit.len == p.peek_token().col {
p.check(.rsbr)
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array_elem_typ := p.get_type()
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if !p.table.known_type(array_elem_typ) {
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p.error('bad type `$array_elem_typ`')
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}
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p.cgen.resetln('')
//p.gen('{0}')
p.is_alloc = false
if is_const_len {
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return '[${mod_gen_name(p.mod)}__$lit]$array_elem_typ'
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}
return '[$lit]$array_elem_typ'
} else {
p.check(.rsbr)
typ = p.get_type()
p.error('no space allowed between [$lit] and $typ')
}
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}
}
if val_typ != typ {
if !p.check_types_no_throw(val_typ, typ) {
p.error('bad array element type `$val_typ` instead of `$typ`')
}
}
if p.tok != .rsbr && p.tok != .semicolon {
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p.gen(', ')
p.check(.comma)
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p.fspace()
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}
i++
// Repeat (a = [0;5] )
if i == 1 && p.tok == .semicolon {
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p.warn('`[0 ; len]` syntax was removed. Use `[0].repeat(len)` instead')
p.check_space(.semicolon)
val := p.cgen.cur_line[pos..]
p.cgen.resetln(p.cgen.cur_line[..pos])
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p.gen('array_repeat_old(& ($typ[]){ $val }, ')
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p.check_types(p.bool_expression(), 'int')
p.gen(', sizeof($typ) )')
p.check(.rsbr)
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return 'array_$typ'
}
}
p.check(.rsbr)
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// type after `]`? (e.g. "[]string")
if p.tok != .name && i == 0 {
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p.error('specify array type: `[]typ` instead of `[]`')
}
if p.tok == .name && i == 0 {
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// vals.len == 0 {
typ = p.get_type()
}
// ! after array => no malloc and no copy
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no_alloc := p.tok == .not
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if no_alloc {
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p.next()
}
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// [1,2,3]!! => [3]int{1,2,3}
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is_fixed_size := p.tok == .not
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if is_fixed_size {
p.next()
p.gen(' }')
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if !p.first_pass() {
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// If we are defining a const array, we don't need to specify the type:
// `a = {1,2,3}`, not `a = (int[]) {1,2,3}`
if p.inside_const {
p.cgen.set_placeholder(new_arr_ph, '{')
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}
else {
p.cgen.set_placeholder(new_arr_ph, '($typ[]) {')
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}
}
return '[$i]$typ'
}
// if ptr {
// typ += '_ptr"
// }
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p.gen_array_init(typ, no_alloc, new_arr_ph, i)
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typ = 'array_$typ'
p.register_array(typ)
return typ
}
// `f32(3)`
// tok is `f32` or `)` if `(*int)(ptr)`
fn (p mut Parser) get_tmp() string {
p.tmp_cnt++
return 'tmp$p.tmp_cnt'
}
fn (p mut Parser) get_tmp_counter() int {
p.tmp_cnt++
return p.tmp_cnt
}
// returns expression's type, and entire expression's string representation)
fn (p mut Parser) tmp_expr() (string, string) {
p.cgen.start_tmp()
typ := p.bool_expression()
val := p.cgen.end_tmp()
return typ, val
}
fn (p mut Parser) if_st(is_expr bool, elif_depth int) string {
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if is_expr {
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//if p.fileis('if_expr') {
//println('IF EXPR')
//}
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p.inside_if_expr = true
p.gen('(')
}
else {
p.gen('if (')
p.fgen('if ')
}
p.next()
// `if a := opt() { }` syntax
if p.tok == .name && p.peek() == .decl_assign {
option_tmp := p.get_tmp()
var_name := p.lit
p.next()
p.check(.decl_assign)
option_type, expr := p.tmp_expr()// := p.bool_expression()
typ := option_type[7..]
// Option_User tmp = get_user(1);
// if (tmp.ok) {
// User user = *(User*)tmp.data;
// [statements]
// }
p.cgen.insert_before('$option_type $option_tmp = $expr; ')
p.check(.lcbr)
p.genln(option_tmp + '.ok) {')
p.genln('$typ $var_name = *($typ*) $option_tmp . data;')
p.register_var(Var {
name: var_name
typ: typ
is_mut: false // TODO
//is_alloc: p.is_alloc || typ.starts_with('array_')
//line_nr: p.tokens[ var_token_idx ].line_nr
//token_idx: var_token_idx
})
p.statements()
return 'void'
} else {
p.check_types(p.bool_expression(), 'bool')
}
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if is_expr {
p.gen(') ? (')
}
else {
p.genln(') {')
}
p.fgen(' ')
p.check(.lcbr)
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mut typ := ''
// if { if hack
if p.tok == .key_if && p.inside_if_expr {
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typ = p.factor()
p.next()
}
else {
typ = p.statements()
}
if_returns := p.returns
p.returns = false
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// println('IF TYp=$typ')
if p.tok == .key_else {
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p.fgenln('')
p.check(.key_else)
p.fspace()
if p.tok == .key_if {
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if is_expr {
p.gen(') : (')
nested := p.if_st(is_expr, elif_depth + 1)
nested_returns := p.returns
p.returns = if_returns && nested_returns
return nested
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}
else {
p.gen(' else ')
nested := p.if_st(is_expr, 0)
nested_returns := p.returns
p.returns = if_returns && nested_returns
return nested
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}
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// return ''
}
if is_expr {
p.gen(') : (')
}
else {
p.genln(' else { ')
}
p.check(.lcbr)
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// statements() returns the type of the last statement
first_typ := typ
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typ = p.statements()
p.inside_if_expr = false
if is_expr {
p.check_types(first_typ, typ)
p.gen(strings.repeat(`)`, elif_depth + 1))
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}
else_returns := p.returns
p.returns = if_returns && else_returns
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return typ
}
p.inside_if_expr = false
if p.fileis('test_test') {
println('if ret typ="$typ" line=$p.scanner.line_nr')
}
return typ
}
fn (p mut Parser) for_st() {
p.check(.key_for)
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p.fgen(' ')
p.for_expr_cnt++
next_tok := p.peek()
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//debug := p.scanner.file_path.contains('r_draw')
p.open_scope()
if p.tok == .lcbr {
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// Infinite loop
p.gen('while (1) {')
}
else if p.tok == .key_mut {
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p.error('`mut` is not required in for loops')
}
// for i := 0; i < 10; i++ {
else if next_tok == .decl_assign || next_tok == .assign || p.tok == .semicolon {
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p.genln('for (')
if next_tok == .decl_assign {
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p.var_decl()
}
else if p.tok != .semicolon {
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// allow `for ;; i++ {`
// Allow `for i = 0; i < ...`
p.statement(false)
}
p.check(.semicolon)
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p.gen(' ; ')
p.fgen(' ')
if p.tok != .semicolon {
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p.bool_expression()
}
p.check(.semicolon)
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p.gen(' ; ')
p.fgen(' ')
if p.tok != .lcbr {
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p.statement(false)
}
p.genln(') { ')
}
// for i, val in array
else if p.peek() == .comma {
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/*
`for i, val in array {`
==>
```
array_int tmp = array;
for (int i = 0; i < tmp.len; i++) {
int val = tmp[i];
```
*/
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i := p.check_name()
p.check(.comma)
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val := p.check_name()
if i == '_' && val == '_' {
p.error('no new variables on the left side of `in`')
}
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p.fgen(' ')
p.check(.key_in)
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p.fgen(' ')
tmp := p.get_tmp()
p.cgen.start_tmp()
mut typ := p.bool_expression()
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is_arr := typ.starts_with('array_')
is_map := typ.starts_with('map_')
is_str := typ == 'string'
is_variadic_arg := typ.starts_with('...')
if is_variadic_arg { typ = typ[3..] }
if !is_arr && !is_str && !is_map && !is_variadic_arg {
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p.error('cannot range over type `$typ`')
}
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expr := p.cgen.end_tmp()
if !is_variadic_arg {
if p.is_js {
p.genln('var $tmp = $expr;')
} else {
p.genln('$typ $tmp = $expr;')
}
}
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pad := if is_arr { 6 } else { 4 }
var_typ := if is_str { 'byte' }
else if is_variadic_arg { typ }
else { typ[pad..] }
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// typ = strings.Replace(typ, "_ptr", "*", -1)
mut i_var_type := 'int'
if is_variadic_arg {
p.gen_for_varg_header(i, expr, typ, val)
}
else if is_arr {
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p.gen_for_header(i, tmp, var_typ, val)
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}
else if is_map {
i_var_type = 'string'
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p.gen_for_map_header(i, tmp, var_typ, val, typ)
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}
else if is_str {
i_var_type = 'byte'
p.gen_for_str_header(i, tmp, var_typ, val)
}
// Register temp vars
if i != '_' {
p.register_var(Var {
name: i
typ: i_var_type
is_mut: true
is_changed: true
})
}
if val != '_' {
p.register_var(Var {
name: val
typ: var_typ
ptr: typ.contains('*')
})
}
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}
// `for val in vals`
else if p.peek() == .key_in {
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val := p.check_name()
p.fgen(' ')
p.check(.key_in)
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p.fspace()
tmp := p.get_tmp()
p.cgen.start_tmp()
mut typ := p.bool_expression()
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expr := p.cgen.end_tmp()
is_range := p.tok == .dotdot
is_variadic_arg := typ.starts_with('...')
if is_variadic_arg { typ = typ[3..] }
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mut range_end := ''
if is_range {
p.check_types(typ, 'int')
p.check_space(.dotdot)
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p.cgen.start_tmp()
p.check_types(p.bool_expression(), 'int')
range_end = p.cgen.end_tmp()
}
is_arr := typ.contains('array')
is_str := typ == 'string'
if !is_arr && !is_str && !is_range && !is_variadic_arg {
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p.error('cannot range over type `$typ`')
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}
if !is_variadic_arg {
if p.is_js {
p.genln('var $tmp = $expr;')
} else {
p.genln('$typ $tmp = $expr;')
}
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}
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// TODO var_type := if...
i := p.get_tmp()
mut var_type := typ
if is_variadic_arg {
p.gen_for_varg_header(i, expr, typ, val)
}
else if is_range {
var_type = 'int'
p.gen_for_range_header(i, range_end, tmp, var_type, val)
}
else if is_arr {
var_type = typ[6..]// all after `array_`
p.gen_for_header(i, tmp, var_type, val)
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}
else if is_str {
var_type = 'byte'
p.gen_for_str_header(i, tmp, var_type, val)
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}
// println('for typ=$typ vartyp=$var_typ')
// Register temp var
if val != '_' {
p.register_var(Var {
name: val
typ: var_type
ptr: typ.contains('*')
is_changed: true
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is_mut: false
is_for_var: true
})
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}
} else {
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// `for a < b {`
p.gen('while (')
p.check_types(p.bool_expression(), 'bool')
p.genln(') {')
}
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p.fspace()
p.check(.lcbr)
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p.genln('')
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p.statements()
p.close_scope()
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p.for_expr_cnt--
p.returns = false // TODO handle loops that are guaranteed to return
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}
fn (p mut Parser) switch_statement() {
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p.error('`switch` statement has been removed, use `match` instead:\n' +
'https://vlang.io/docs#match')
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}
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// Returns typ if used as expession
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fn (p mut Parser) match_statement(is_expr bool) string {
p.check(.key_match)
p.cgen.start_tmp()
typ := p.bool_expression()
expr := p.cgen.end_tmp()
// is it safe to use p.cgen.insert_before ???
tmp_var := p.get_tmp()
p.cgen.insert_before('$typ $tmp_var = $expr;')
p.check(.lcbr)
mut i := 0
mut all_cases_return := true
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// stores typ of resulting variable
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mut res_typ := ''
defer {
p.check(.rcbr)
}
for p.tok != .rcbr {
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if p.tok == .key_else {
p.check(.key_else)
if p.tok == .arrow {
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p.warn(match_arrow_warning)
p.check(.arrow)
}
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// unwrap match if there is only else
if i == 0 {
if is_expr {
// statements are dissallowed (if match is expression) so user cant declare variables there and so on
// allow braces is else
got_brace := p.tok == .lcbr
if got_brace {
p.check(.lcbr)
}
p.gen('( ')
res_typ = p.bool_expression()
p.gen(' )')
// allow braces in else
if got_brace {
p.check(.rcbr)
}
return res_typ
} else {
p.returns = false
p.check(.lcbr)
p.genln('{ ')
p.statements()
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p.returns = all_cases_return && p.returns
return ''
}
}
if is_expr {
// statements are dissallowed (if match is expression) so user cant declare variables there and so on
p.gen(':(')
// allow braces is else
got_brace := p.tok == .lcbr
if got_brace {
p.check(.lcbr)
}
p.check_types(p.bool_expression(), res_typ)
// allow braces in else
if got_brace {
p.check(.rcbr)
}
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p.gen(strings.repeat(`)`, i+1))
return res_typ
} else {
p.returns = false
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p.genln('else // default:')
p.check(.lcbr)
p.genln('{ ')
p.statements()
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p.returns = all_cases_return && p.returns
return ''
}
}
if i > 0 {
if is_expr {
p.gen(': (')
} else {
p.gen('else ')
}
} else if is_expr {
p.gen('(')
}
if is_expr {
p.gen('(')
} else {
p.gen('if (')
}
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ph := p.cgen.add_placeholder()
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// Multiple checks separated by comma
mut got_comma := false
for {
if got_comma {
p.gen(') || (')
}
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mut got_string := false
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if typ == 'string' {
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got_string = true
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p.gen('string_eq($tmp_var, ')
}
else {
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p.gen('$tmp_var == ')
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}
p.expected_type = typ
p.check_types(p.bool_expression(), typ)
p.expected_type = ''
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if got_string {
p.gen(')')
}
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if p.tok != .comma {
if got_comma {
p.gen(') ')
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p.cgen.set_placeholder(ph, '(')
}
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break
}
p.check(.comma)
got_comma = true
}
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p.gen(')')
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if p.tok == .arrow {
p.warn(match_arrow_warning)
p.check(.arrow)
}
// statements are dissallowed (if match is expression) so user cant declare variables there and so on
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if is_expr {
p.gen('? (')
// braces are required for now
p.check(.lcbr)
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if i == 0 {
// on the first iteration we set value of res_typ
res_typ = p.bool_expression()
} else {
// later on we check that the value is of res_typ type
p.check_types(p.bool_expression(), res_typ)
}
// braces are required for now
p.check(.rcbr)
p.gen(')')
}
else {
p.returns = false
p.check(.lcbr)
p.genln('{ ')
p.statements()
all_cases_return = all_cases_return && p.returns
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// p.gen(')')
}
i++
}
if is_expr {
// we get here if no else found, ternary requires "else" branch
p.error('Match expession requires "else"')
}
p.returns = false // only get here when no default, so return is not guaranteed
return ''
}
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fn (p mut Parser) assert_statement() {
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if p.first_pass() {
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return
}
p.check(.key_assert)
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p.fspace()
tmp := p.get_tmp()
p.gen('bool $tmp = ')
p.check_types(p.bool_expression(), 'bool')
// TODO print "expected: got" for failed tests
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filename := cescaped_path(p.file_path)
p.genln(';
\n
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if (!$tmp) {
println(tos2((byte *)"\\x1B[31mFAILED: $p.cur_fn.name() in $filename:$p.scanner.line_nr\\x1B[0m"));
g_test_fails++;
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return;
// TODO
// Maybe print all vars in a test function if it fails?
} else {
g_test_oks++;
//println(tos2((byte *)"\\x1B[32mPASSED: $p.cur_fn.name()\\x1B[0m"));
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}
')
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}
fn (p mut Parser) return_st() {
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p.check(.key_return)
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p.fgen(' ')
deferred_text := p.get_deferred_text()
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fn_returns := p.cur_fn.typ != 'void'
if fn_returns {
if p.tok == .rcbr {
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p.error('`$p.cur_fn.name` needs to return `$p.cur_fn.typ`')
}
ph := p.cgen.add_placeholder()
p.inside_return_expr = true
is_none := p.tok == .key_none
p.expected_type = p.cur_fn.typ
mut expr_type := p.bool_expression()
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// println('$p.cur_fn.name returns type $expr_type, should be $p.cur_fn.typ')
mut types := []string
mut mr_values := [p.cgen.cur_line[ph..].trim_space()]
types << expr_type
for p.tok == .comma {
p.check(.comma)
p.cgen.start_tmp()
types << p.bool_expression()
mr_values << p.cgen.end_tmp().trim_space()
}
mut cur_fn_typ_chk := p.cur_fn.typ
// multiple returns
if types.len > 1 {
expr_type = types.join(',')
cur_fn_typ_chk = cur_fn_typ_chk.replace('_V_MulRet_', '').replace('_PTR_', '*').replace('_V_', ',')
mut ret_fields := ''
for ret_val_idx, ret_val in mr_values {
if ret_val_idx > 0 {
ret_fields += ','
}
ret_fields += '.var_$ret_val_idx=${ret_val}'
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}
p.cgen.resetln('($p.cur_fn.typ){$ret_fields}')
}
p.inside_return_expr = false
// Automatically wrap an object inside an option if the function
// returns an option:
// `return val` => `return opt_ok(val)`
if p.cur_fn.typ.ends_with(expr_type) && !is_none &&
p.cur_fn.typ.starts_with('Option_') {
tmp := p.get_tmp()
ret := p.cgen.cur_line[ph..]
typ := expr_type.replace('Option_', '')
p.cgen.resetln('$expr_type $tmp = OPTION_CAST($expr_type)($ret);')
p.genln(deferred_text)
p.gen('return opt_ok(&$tmp, sizeof($typ))')
}
else {
ret := p.cgen.cur_line[ph..]
if deferred_text == '' || expr_type == 'void*' {
// no defer{} necessary?
if expr_type == '${p.cur_fn.typ}*' {
p.cgen.resetln('return *$ret')
} else {
p.cgen.resetln('return $ret')
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}
} else {
tmp := p.get_tmp()
p.cgen.resetln('$expr_type $tmp = $ret;\n')
p.genln(deferred_text)
p.genln('return $tmp;')
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}
}
p.check_types(expr_type, cur_fn_typ_chk)
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}
else {
// Don't allow `return val` in functions that don't return anything
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if !p.is_vweb && (p.tok == .name || p.tok == .number || p.tok == .str) {
p.error_with_token_index('function `$p.cur_fn.name` should not return a value', p.cur_fn.fn_name_token_idx)
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}
p.genln(deferred_text)
if p.cur_fn.name == 'main' {
p.gen('return 0')
}
else {
p.gen('return')
}
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}
p.returns = true
}
fn (p Parser) get_deferred_text() string {
// @emily33901: Scoped defer
// Check all of our defer texts to see if there is one at a higher scope level
// The one for our current scope would be the last so any before that need to be
// added.
mut deferred_text := ''
for text in p.cur_fn.defer_text {
if text != '' {
// In reverse order
deferred_text = text + deferred_text
}
}
return deferred_text
}
fn prepend_mod(mod, name string) string {
return '${mod}__${name}'
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}
fn (p &Parser) prepend_mod(name string) string {
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return prepend_mod(mod_gen_name(p.mod), name)
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}
fn (p mut Parser) go_statement() {
p.check(.key_go)
mut gotoken_idx := p.cur_tok_index()
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// TODO copypasta of name_expr() ?
if p.peek() == .dot {
// Method
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var_name := p.lit
v := p.find_var(var_name) or {
return
}
p.mark_var_used(v)
gotoken_idx = p.cur_tok_index()
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p.next()
p.check(.dot)
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typ := p.table.find_type(v.typ)
method := p.table.find_method(typ, p.lit) or {
p.error_with_token_index('go method missing $var_name', gotoken_idx)
return
}
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p.async_fn_call(method, 0, var_name, v.typ)
}
else {
f_name := p.lit
// Normal function
f := p.table.find_fn(p.prepend_mod(f_name)) or {
println( p.table.debug_fns() )
p.error_with_token_index('can not find function $f_name', gotoken_idx)
return
}
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if f.name == 'println' || f.name == 'print' {
p.error_with_token_index('`go` cannot be used with `println`', gotoken_idx)
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}
p.async_fn_call(f, 0, '', '')
}
}
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/*
fn (p mut Parser) register_var(v Var) {
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if v.line_nr == 0 {
spos := p.scanner.get_scanner_pos()
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p.register_var({ v | scanner_pos: spos, line_nr: spos.line_nr })
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} else {
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p.register_var(v)
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}
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}
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*/
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// user:=jsdecode(User, user_json_string)
fn (p mut Parser) js_decode() string {
p.check(.name)// json
p.check(.dot)
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op := p.check_name()
op_token_idx := p.cur_tok_index()
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if op == 'decode' {
// User tmp2; tmp2.foo = 0; tmp2.bar = 0;// I forgot to zero vals before => huge bug
// Option_User tmp3 = jsdecode_User(json_parse( s), &tmp2); ;
// if (!tmp3 .ok) {
// return
// }
// User u = *(User*) tmp3 . data; // TODO remove this (generated in or {} block handler)
p.check(.lpar)
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typ := p.get_type()
p.check(.comma)
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p.cgen.start_tmp()
p.check_types(p.bool_expression(), 'string')
expr := p.cgen.end_tmp()
p.check(.rpar)
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tmp := p.get_tmp()
cjson_tmp := p.get_tmp()
mut decl := '$typ $tmp; '
// Init the struct
T := p.table.find_type(typ)
for field in T.fields {
def_val := type_default(field.typ)
if def_val != '' {
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decl += '$tmp . $field.name = OPTION_CAST($field.typ) $def_val;\n'
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}
}
p.gen_json_for_type(T)
decl += 'cJSON* $cjson_tmp = json__json_parse($expr);'
p.cgen.insert_before(decl)
// p.gen('jsdecode_$typ(json_parse($expr), &$tmp);')
p.gen('json__jsdecode_$typ($cjson_tmp, &$tmp); cJSON_Delete($cjson_tmp);')
opt_type := 'Option_$typ'
p.cgen.typedefs << 'typedef Option $opt_type;'
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p.table.register_builtin(opt_type)
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return opt_type
}
else if op == 'encode' {
p.check(.lpar)
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p.cgen.start_tmp()
typ := p.bool_expression()
T := p.table.find_type(typ)
p.gen_json_for_type(T)
expr := p.cgen.end_tmp()
p.check(.rpar)
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p.gen('json__json_print(json__jsencode_$typ($expr))')
return 'string'
}
else {
p.error_with_token_index('bad json op "$op"', op_token_idx)
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}
return ''
}
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fn (p mut Parser) attribute() {
p.check(.lsbr)
if p.tok == .key_if {
// [if vfmt]
p.next()
p.attr = 'if ' + p.check_name()
} else {
p.attr = p.check_name()
}
attr_token_idx := p.cur_tok_index()
if p.tok == .colon {
p.check(.colon)
p.attr = p.attr + ':' + p.check_name()
}
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p.check(.rsbr)
if p.tok == .key_fn || (p.tok == .key_pub && p.peek() == .key_fn) {
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p.fn_decl()
p.attr = ''
return
}
else if p.tok == .key_struct {
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p.struct_decl()
p.attr = ''
return
}
p.error_with_token_index('bad attribute usage', attr_token_idx)
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}
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fn (p mut Parser) defer_st() {
p.check(.key_defer)
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p.check(.lcbr)
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pos := p.cgen.lines.len
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// Save everything inside the defer block to `defer_text`.
// It will be inserted before every `return`
// Emily: TODO: all variables that are used in this defer statement need to be evaluated when the block
// is defined otherwise they could change over the course of the function
// (make temps out of them)
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p.genln('{')
p.statements()
p.cur_fn.defer_text.last() = p.cgen.lines[pos..].join('\n') + p.cur_fn.defer_text.last()
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// Rollback p.cgen.lines
p.cgen.lines = p.cgen.lines[..pos]
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p.cgen.resetln('')
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}
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fn (p mut Parser) check_and_register_used_imported_type(typ_name string) {
us_idx := typ_name.index('__')
if us_idx != -1 {
arg_mod := typ_name[..us_idx]
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if p.import_table.known_alias(arg_mod) {
p.import_table.register_used_import(arg_mod)
}
}
}
fn (p mut Parser) check_unused_imports() {
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// Don't run in the generated V file with `.str()`
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if p.is_vgen {
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return
}
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mut output := ''
for alias, mod in p.import_table.imports {
if !p.import_table.is_used_import(alias) {
mod_alias := if alias == mod { alias } else { '$alias ($mod)' }
output += '\n * $mod_alias'
}
}
if output == '' { return }
// the imports are usually at the start of the file
p.production_error_with_token_index( 'the following imports were never used: $output', 0 )
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}
fn (p mut Parser) is_next_expr_fn_call() (bool, string) {
mut next_expr := p.lit
mut is_fn_call := p.peek() == .lpar
if !is_fn_call {
mut i := p.token_idx+1
for (p.tokens[i].tok == .dot || p.tokens[i].tok == .name) &&
p.tokens[i].lit != '_' && i < p.tokens.len {
next_expr += if p.tokens[i].tok == .dot { '.' } else { p.tokens[i].lit }
i++
}
is_fn_call = p.tokens[i].tok == .lpar
}
return is_fn_call, next_expr
}