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v/compiler/comptime.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 main
import (
vweb.tmpl // for `$vweb_html()`
os
)
fn (p mut Parser) comp_time() {
p.check(.dollar)
if p.tok == .key_if {
p.check(.key_if)
p.fspace()
not := p.tok == .not
if not {
p.check(.not)
}
name := p.check_name()
p.fspace()
if name in SupportedPlatforms {
ifdef_name := os_name_to_ifdef(name)
if not {
p.genln('#ifndef $ifdef_name')
}
else {
p.genln('#ifdef $ifdef_name')
}
p.check(.lcbr)
p.statements_no_rcbr()
if ! (p.tok == .dollar && p.peek() == .key_else) {
p.genln('#endif')
}
}
else {
println('Supported platforms:')
println(SupportedPlatforms)
p.error('unknown platform `$name`')
}
}
else if p.tok == .key_for {
p.next()
name := p.check_name()
if name != 'field' {
p.error('for field only')
}
p.check(.key_in)
p.check_name()
p.check(.dot)
p.check_name()// fields
p.check(.lcbr)
// for p.tok != .rcbr && p.tok != .eof {
res_name := p.check_name()
println(res_name)
p.check(.dot)
p.check(.dollar)
p.check(.name)
p.check(.assign)
p.cgen.start_tmp()
p.bool_expression()
val := p.cgen.end_tmp()
println(val)
p.check(.rcbr)
// }
}
else if p.tok == .key_else {
p.next()
p.check(.lcbr)
p.genln('#else')
p.statements_no_rcbr()
p.genln('#endif')
}
// $vweb.html()
// Compile vweb html template to V code, parse that V code and embed the resulting V functions
// that returns an html string
else if p.tok == .name && p.lit == 'vweb' {
path := p.cur_fn.name + '.html'
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if p.pref.is_debug {
println('compiling tmpl $path')
}
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if !os.file_exists(path) {
p.error('vweb HTML template "$path" not found')
}
p.check(.name) // skip `vweb.html()` TODO
p.check(.dot)
p.check(.name)
p.check(.lpar)
p.check(.rpar)
v_code := tmpl.compile_template(path)
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if os.file_exists('.vwebtmpl.v') {
os.rm('.vwebtmpl.v')
}
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os.write_file('.vwebtmpl.v', v_code.clone()) // TODO don't need clone, compiler bug
p.genln('')
// Parse the function and embed resulting C code in current function so that
// all variables are available.
pos := p.cgen.lines.len - 1
mut pp := p.v.new_parser('.vwebtmpl.v', Pass.main)
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if !p.pref.is_debug {
os.rm('.vwebtmpl.v')
}
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pp.is_vweb = true
pp.cur_fn = p.cur_fn // give access too all variables in current function
pp.parse()
tmpl_fn_body := p.cgen.lines.slice(pos + 2, p.cgen.lines.len).join('\n').clone()
end_pos := tmpl_fn_body.last_index('Builder_str( sb )') + 19 // TODO
p.cgen.lines = p.cgen.lines.left(pos)
p.genln('/////////////////// tmpl start')
p.genln(tmpl_fn_body.left(end_pos))
p.genln('/////////////////// tmpl end')
// `app.vweb.html(index_view())`
receiver := p.cur_fn.args[0]
dot := if receiver.is_mut { '->' } else { '.' }
p.genln('vweb__Context_html($receiver.name $dot vweb, tmpl_res)')
}
else {
p.error('bad comptime expr')
}
}
// #include, #flag, #v
fn (p mut Parser) chash() {
hash := p.lit.trim_space()
// println('chsh() file=$p.file is_sig=${p.is_sig()} hash="$hash"')
p.next()
is_sig := p.is_sig()
if hash.starts_with('flag ') {
mut flag := hash.right(5)
// No the right os? Skip!
// mut ok := true
if hash.contains('linux') && p.os != .linux {
return
}
else if hash.contains('darwin') && p.os != .mac {
return
}
else if hash.contains('windows') && (p.os != .windows && p.os != .msvc) {
return
}
// Remove "linux" etc from flag
if flag.contains('linux') || flag.contains('darwin') || flag.contains('windows') {
pos := flag.index(' ')
flag = flag.right(pos)
}
has_vroot := flag.contains('@VROOT')
flag = flag.trim_space().replace('@VROOT', p.vroot)
if p.table.flags.contains(flag) {
return
}
p.log('adding flag "$flag"')
// `@VROOT/thirdparty/glad/glad.o`, make sure it exists, otherwise build it
if has_vroot && flag.contains('.o') {
if p.os == .msvc {
build_thirdparty_obj_file_with_msvc(flag)
}
else {
build_thirdparty_obj_file(flag)
}
}
p.table.flags << flag
return
}
if hash.starts_with('include') {
if p.first_pass() && !is_sig {
p.cgen.includes << '#$hash'
return
}
}
// TODO remove after ui_mac.m is removed
else if hash.contains('embed') {
pos := hash.index('embed') + 5
file := hash.right(pos)
if p.pref.build_mode != BuildMode.default_mode {
p.genln('#include $file')
}
}
else if hash.contains('define') {
// Move defines on top
p.cgen.includes << '#$hash'
}
else if hash == 'v' {
println('v script')
//p.v_script = true
}
else {
if !p.can_chash {
p.error('bad token `#` (embedding C code is no longer supported)')
}
p.genln(hash)
}
}
// `user.$method()` (`method` is a string)
fn (p mut Parser) comptime_method_call(typ Type) {
p.cgen.cur_line = ''
p.check(.dollar)
var := p.check_name()
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for i, method in typ.methods {
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if method.typ != 'void' {
continue
}
receiver := method.args[0]
amp := if receiver.is_mut { '&' } else { '' }
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if i > 0 {
p.gen(' else ')
}
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p.gen('if ( string_eq($var, _STR("$method.name")) ) ${typ.name}_$method.name($amp $p.expr_var.name);')
}
p.check(.lpar)
p.check(.rpar)
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if p.tok == .key_orelse {
p.check(.key_orelse)
p.genln('else {')
p.check(.lcbr)
p.statements()
}
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}