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local vars + Parser.errror()

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This commit is contained in:
Alexander Medvednikov 2019-12-29 06:50:08 +01:00
parent c81fbee4ab
commit c915c58d12
8 changed files with 173 additions and 90 deletions
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6
Makefile
View File

@ -93,8 +93,8 @@ selfcompile:
modules: module_builtin module_strings module_strconv
module_builtin:
./v build module vlib/builtin > /dev/null
#./v build module vlib/builtin > /dev/null
module_strings:
./v build module vlib/strings > /dev/null
#./v build module vlib/strings > /dev/null
module_strconv:
./v build module vlib/strconv > /dev/null
#./v build module vlib/strconv > /dev/null

3
vlib/v/cgen/cgen_test.v
View File

@ -5,6 +5,7 @@ import (
v.ast
v.cgen
v.table
term
)
const (
@ -29,7 +30,7 @@ fn test_c_files() {
eprintln('${i}... OK')
}
else {
eprintln('${i}... FAIL')
eprintln('${i}... ' + term.red('FAIL'))
eprintln('expected:\n$ctext\ngot:\n$res')
}
}

2
vlib/v/cgen/tests/2.c
View File

@ -10,4 +10,6 @@ void function2() {
string s = tos3("hi");
int m = 10;
x += 10;
x += 1;
m += 2;
}

5
vlib/v/cgen/tests/2.v
View File

@ -9,7 +9,10 @@ fn function2() {
mut x := 0
f := 10.1
s := 'hi'
m := 10
mut m := 10
x += 10
x += 1
m += 2
//a += 1
//c := 0
}

25
vlib/v/parser/parser.v
View File

@ -9,6 +9,7 @@ import (
v.token
v.table
v.types
term
)
struct Parser {
@ -169,9 +170,18 @@ pub fn (p mut Parser) stmt() ast.Stmt {
}
pub fn (p mut Parser) assign_stmt() ast.AssignStmt {
name := p.tok.lit
//println('looking for $name')
var := p.table.find_var(name) or {
p.error('unknown variable `$name`')
exit(1)
}
if !var.is_mut {
p.error('`$var.name` is immutable, declare it with `mut $var.name := ...`')
}
left_expr,left_type := p.expr(0)
op := p.tok.kind
println('assignn_stmt() ' + op.str())
//println('assignn_stmt() ' + op.str())
p.next()
right_expr,right_type := p.expr(0)
return ast.AssignStmt{
@ -181,6 +191,11 @@ pub fn (p mut Parser) assign_stmt() ast.AssignStmt {
}
}
pub fn (p &Parser) error(s string) {
println(term.bold(term.red('x.v:$p.tok.line_nr: $s')))
exit(1)
}
// Implementation of Pratt Precedence
pub fn (p mut Parser) expr(rbp int) (ast.Expr,types.Type) {
// println('expr at ' + p.tok.str())
@ -295,6 +310,7 @@ fn (p mut Parser) import_stmt() ast.Import {
}
fn (p mut Parser) fn_decl() ast.FnDecl {
p.table.clear_vars()
p.check(.key_fn)
name := p.tok.lit
// println('fn decl $name')
@ -343,10 +359,13 @@ fn (p mut Parser) var_decl() ast.VarDecl {
name := p.tok.lit
p.read_first_token()
expr,t := p.expr(token.lowest_prec)
if name in p.table.names {
if _ := p.table.find_var(name) {
verror('redefinition of `$name`')
}
p.table.names << name
p.table.register_var(table.Var{
name: name
is_mut: is_mut
})
// println(p.table.names)
// println('added $name')
return ast.VarDecl{

154
vlib/v/scanner/scanner.v
View File

@ -75,9 +75,9 @@ pub fn new_scanner(text string) &Scanner {
}
}
fn scan_res(tok token.TokenKind, lit string) token.Token {
fn (s &Scanner) scan_res(tok token.TokenKind, lit string) token.Token {
return token.Token{
tok,lit}
tok,lit,s.line_nr + 1}
}
fn (s mut Scanner) ident_name() string {
@ -216,7 +216,7 @@ fn (s mut Scanner) skip_whitespace() {
fn (s mut Scanner) end_of_file() token.Token {
s.pos = s.text.len
s.inc_line_number()
return scan_res(.eof, '')
return s.scan_res(.eof, '')
}
pub fn (s mut Scanner) scan() token.Token {
@ -238,10 +238,10 @@ pub fn (s mut Scanner) scan() token.Token {
if s.inter_end {
if s.text[s.pos] == s.quote {
s.inter_end = false
return scan_res(.str, '')
return s.scan_res(.str, '')
}
s.inter_end = false
return scan_res(.str, s.ident_string())
return s.scan_res(.str, s.ident_string())
}
s.skip_whitespace()
// end of file
@ -261,7 +261,7 @@ pub fn (s mut Scanner) scan() token.Token {
// Check if not .eof to prevent panic
next_char := if s.pos + 1 < s.text.len { s.text[s.pos + 1] } else { `\0` }
if token.is_key(name) {
return scan_res(token.key_to_token(name), '')
return s.scan_res(token.key_to_token(name), '')
}
// 'asdf $b' => "b" is the last name in the string, dont start parsing string
// at the next ', skip it
@ -283,12 +283,12 @@ pub fn (s mut Scanner) scan() token.Token {
// Otherwise the scanner would be stuck at s.pos = 0
s.pos++
}
return scan_res(.name, name)
return s.scan_res(.name, name)
}
// `123`, `.123`
else if c.is_digit() || (c == `.` && nextc.is_digit()) {
num := s.ident_number()
return scan_res(.number, num)
return s.scan_res(.number, num)
}
// Handle `'$fn()'`
if c == `)` && s.inter_start {
@ -298,88 +298,88 @@ pub fn (s mut Scanner) scan() token.Token {
if next_char == s.quote {
s.inside_string = false
}
return scan_res(.rpar, '')
return s.scan_res(.rpar, '')
}
// all other tokens
match c {
`+` {
if nextc == `+` {
s.pos++
return scan_res(.inc, '')
return s.scan_res(.inc, '')
}
else if nextc == `=` {
s.pos++
return scan_res(.plus_assign, '')
return s.scan_res(.plus_assign, '')
}
return scan_res(.plus, '')
return s.scan_res(.plus, '')
}
`-` {
if nextc == `-` {
s.pos++
return scan_res(.dec, '')
return s.scan_res(.dec, '')
}
else if nextc == `=` {
s.pos++
return scan_res(.minus_assign, '')
return s.scan_res(.minus_assign, '')
}
return scan_res(.minus, '')
return s.scan_res(.minus, '')
}
`*` {
if nextc == `=` {
s.pos++
return scan_res(.mult_assign, '')
return s.scan_res(.mult_assign, '')
}
return scan_res(.mul, '')
return s.scan_res(.mul, '')
}
`^` {
if nextc == `=` {
s.pos++
return scan_res(.xor_assign, '')
return s.scan_res(.xor_assign, '')
}
return scan_res(.xor, '')
return s.scan_res(.xor, '')
}
`%` {
if nextc == `=` {
s.pos++
return scan_res(.mod_assign, '')
return s.scan_res(.mod_assign, '')
}
return scan_res(.mod, '')
return s.scan_res(.mod, '')
}
`?` {
return scan_res(.question, '')
return s.scan_res(.question, '')
}
single_quote, double_quote {
return scan_res(.str, s.ident_string())
return s.scan_res(.str, s.ident_string())
}
`\`` {
// ` // apostrophe balance comment. do not remove
return scan_res(.chartoken, s.ident_char())
return s.scan_res(.chartoken, s.ident_char())
}
`(` {
return scan_res(.lpar, '')
return s.scan_res(.lpar, '')
}
`)` {
return scan_res(.rpar, '')
return s.scan_res(.rpar, '')
}
`[` {
return scan_res(.lsbr, '')
return s.scan_res(.lsbr, '')
}
`]` {
return scan_res(.rsbr, '')
return s.scan_res(.rsbr, '')
}
`{` {
// Skip { in `${` in strings
if s.inside_string {
return s.scan()
}
return scan_res(.lcbr, '')
return s.scan_res(.lcbr, '')
}
`$` {
if s.inside_string {
return scan_res(.str_dollar, '')
return s.scan_res(.str_dollar, '')
}
else {
return scan_res(.dollar, '')
return s.scan_res(.dollar, '')
}
}
`}` {
@ -389,38 +389,38 @@ pub fn (s mut Scanner) scan() token.Token {
s.pos++
if s.text[s.pos] == s.quote {
s.inside_string = false
return scan_res(.str, '')
return s.scan_res(.str, '')
}
return scan_res(.str, s.ident_string())
return s.scan_res(.str, s.ident_string())
}
else {
return scan_res(.rcbr, '')
return s.scan_res(.rcbr, '')
}
}
`&` {
if nextc == `=` {
s.pos++
return scan_res(.and_assign, '')
return s.scan_res(.and_assign, '')
}
if nextc == `&` {
s.pos++
return scan_res(.and, '')
return s.scan_res(.and, '')
}
return scan_res(.amp, '')
return s.scan_res(.amp, '')
}
`|` {
if nextc == `|` {
s.pos++
return scan_res(.logical_or, '')
return s.scan_res(.logical_or, '')
}
if nextc == `=` {
s.pos++
return scan_res(.or_assign, '')
return s.scan_res(.or_assign, '')
}
return scan_res(.pipe, '')
return s.scan_res(.pipe, '')
}
`,` {
return scan_res(.comma, '')
return s.scan_res(.comma, '')
}
`@` {
s.pos++
@ -434,36 +434,36 @@ pub fn (s mut Scanner) scan() token.Token {
// println( 'file: ' + @FILE + ' | line: ' + @LINE + ' | fn: ' + @FN)
// ... which is useful while debugging/tracing
if name == 'FN' {
return scan_res(.str, s.fn_name)
return s.scan_res(.str, s.fn_name)
}
if name == 'FILE' {
return scan_res(.str, cescaped_path(os.realpath(s.file_path)))
return s.scan_res(.str, cescaped_path(os.realpath(s.file_path)))
}
if name == 'LINE' {
return scan_res(.str, (s.line_nr + 1).str())
return s.scan_res(.str, (s.line_nr + 1).str())
}
if name == 'COLUMN' {
return scan_res(.str, (s.current_column()).str())
return s.scan_res(.str, (s.current_column()).str())
}
if name == 'VHASH' {
return scan_res(.str, vhash())
return s.scan_res(.str, vhash())
}
if !token.is_key(name) {
s.error('@ must be used before keywords (e.g. `@type string`)')
}
return scan_res(.name, name)
return s.scan_res(.name, name)
}
/*
case `\r`:
if nextc == `\n` {
s.pos++
s.last_nl_pos = s.pos
return scan_res(.nl, '')
return s.scan_res(.nl, '')
}
}
case `\n`:
s.last_nl_pos = s.pos
return scan_res(.nl, '')
return s.scan_res(.nl, '')
}
*/
@ -472,11 +472,11 @@ pub fn (s mut Scanner) scan() token.Token {
s.pos++
if s.text[s.pos + 1] == `.` {
s.pos++
return scan_res(.ellipsis, '')
return s.scan_res(.ellipsis, '')
}
return scan_res(.dotdot, '')
return s.scan_res(.dotdot, '')
}
return scan_res(.dot, '')
return s.scan_res(.dot, '')
}
`#` {
start := s.pos + 1
@ -488,100 +488,100 @@ pub fn (s mut Scanner) scan() token.Token {
return s.scan()
}
hash := s.text[start..s.pos]
return scan_res(.hash, hash.trim_space())
return s.scan_res(.hash, hash.trim_space())
}
`>` {
if nextc == `=` {
s.pos++
return scan_res(.ge, '')
return s.scan_res(.ge, '')
}
else if nextc == `>` {
if s.pos + 2 < s.text.len && s.text[s.pos + 2] == `=` {
s.pos += 2
return scan_res(.righ_shift_assign, '')
return s.scan_res(.righ_shift_assign, '')
}
s.pos++
return scan_res(.righ_shift, '')
return s.scan_res(.righ_shift, '')
}
else {
return scan_res(.gt, '')
return s.scan_res(.gt, '')
}
}
0xE2 {
// case `≠`:
if nextc == 0x89 && s.text[s.pos + 2] == 0xA0 {
s.pos += 2
return scan_res(.ne, '')
return s.scan_res(.ne, '')
}
// ⩽
else if nextc == 0x89 && s.text[s.pos + 2] == 0xBD {
s.pos += 2
return scan_res(.le, '')
return s.scan_res(.le, '')
}
// ⩾
else if nextc == 0xA9 && s.text[s.pos + 2] == 0xBE {
s.pos += 2
return scan_res(.ge, '')
return s.scan_res(.ge, '')
}
}
`<` {
if nextc == `=` {
s.pos++
return scan_res(.le, '')
return s.scan_res(.le, '')
}
else if nextc == `<` {
if s.pos + 2 < s.text.len && s.text[s.pos + 2] == `=` {
s.pos += 2
return scan_res(.left_shift_assign, '')
return s.scan_res(.left_shift_assign, '')
}
s.pos++
return scan_res(.left_shift, '')
return s.scan_res(.left_shift, '')
}
else {
return scan_res(.lt, '')
return s.scan_res(.lt, '')
}
}
`=` {
if nextc == `=` {
s.pos++
return scan_res(.eq, '')
return s.scan_res(.eq, '')
}
else if nextc == `>` {
s.pos++
return scan_res(.arrow, '')
return s.scan_res(.arrow, '')
}
else {
return scan_res(.assign, '')
return s.scan_res(.assign, '')
}
}
`:` {
if nextc == `=` {
s.pos++
return scan_res(.decl_assign, '')
return s.scan_res(.decl_assign, '')
}
else {
return scan_res(.colon, '')
return s.scan_res(.colon, '')
}
}
`;` {
return scan_res(.semicolon, '')
return s.scan_res(.semicolon, '')
}
`!` {
if nextc == `=` {
s.pos++
return scan_res(.ne, '')
return s.scan_res(.ne, '')
}
else {
return scan_res(.not, '')
return s.scan_res(.not, '')
}
}
`~` {
return scan_res(.bit_not, '')
return s.scan_res(.bit_not, '')
}
`/` {
if nextc == `=` {
s.pos++
return scan_res(.div_assign, '')
return s.scan_res(.div_assign, '')
}
if nextc == `/` {
start := s.pos + 1
@ -591,7 +591,7 @@ pub fn (s mut Scanner) scan() token.Token {
if s.is_fmt {
s.pos-- // fix line_nr, \n was read, and the comment is marked on the next line
s.line_nr--
return scan_res(.line_comment, s.line_comment)
return s.scan_res(.line_comment, s.line_comment)
}
// s.fgenln('// ${s.prev_tok.str()} "$s.line_comment"')
// Skip the comment (return the next token)
@ -625,12 +625,12 @@ pub fn (s mut Scanner) scan() token.Token {
comment := s.text[start..end]
if s.is_fmt {
s.line_comment = comment
return scan_res(.mline_comment, s.line_comment)
return s.scan_res(.mline_comment, s.line_comment)
}
// Skip if not in fmt mode
return s.scan()
}
return scan_res(.div, '')
return s.scan_res(.div, '')
}
else {}
}

60
vlib/v/table/table.v
View File

@ -2,6 +2,64 @@ module table
pub struct Table {
pub mut:
names []string
local_vars []Var
}
pub struct Var {
pub:
name string
is_mut bool
}
pub fn (t &Table) find_var(name string) ?Var {
/*
for i in 0 .. p.var_idx {
if p.local_vars[i].name == name {
return p.local_vars[i]
}
}
*/
// println(t.names)
for var in t.local_vars {
if var.name == name {
return var
}
}
return none
}
pub fn (t mut Table) clear_vars() {
// shared a := [1, 2, 3]
// p.var_idx = 0
if t.local_vars.len > 0 {
// if p.pref.autofree {
// p.local_vars.free()
// }
t.local_vars = []
}
}
fn (t mut Table) register_var(v Var) {
t.local_vars << v
/*
mut new_var := {
v |
idx:p.var_idx,
scope_level:p.cur_fn.scope_level
}
if v.line_nr == 0 {
new_var.token_idx = p.cur_tok_index()
new_var.line_nr = p.cur_tok().line_nr
}
// Expand the array
if p.var_idx >= p.local_vars.len {
p.local_vars << new_var
}
else {
p.local_vars[p.var_idx] = new_var
}
p.var_idx++
*/
}

2
vlib/v/token/token.v
View File

@ -7,7 +7,7 @@ pub struct Token {
pub:
kind TokenKind // the token number/enum; for quick comparisons
lit string // literal representation of the token
// line_nr int // the line number in the source where the token occured
line_nr int // the line number in the source where the token occured
// name_idx int // name table index for O(1) lookup
// pos int // the position of the token in scanner text
}