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v/vlib/compiler/module_header.v

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// Copyright (c) 2019-2020 Alexander Medvednikov. All rights reserved.
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// 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 (
strings
os
filepath
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)
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/*
.vh generation logic.
.vh files contain only function signatures, consts, and types.
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They are used together with pre-compiled modules.
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*/
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struct VhGen {
mut:
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i int // token index
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consts strings.Builder
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fns strings.Builder
types strings.Builder
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tokens []Token
}
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// `mod` == "vlib/os"
fn generate_vh(mod string) {
println('\n\n\n\nGenerating a V header file for module `$mod`')
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vexe := vexe_path()
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full_mod_path := filepath.join(filepath.dir(vexe),mod)
dir := if mod.starts_with('vlib') { '$compiler.v_modules_path${os.path_separator}$mod' } else { mod }
path := dir + '.vh'
pdir := dir.all_before_last(os.path_separator)
if !os.is_dir(pdir) {
os.mkdir_all(pdir)
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// os.mkdir(os.realpath(dir)) or { panic(err) }
}
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mut out := os.create(path)or{
panic(err)
}
mod_path := mod.replace('\\', '/')
out.writeln('// $mod_path module header\n')
mod_def := if mod_path.contains('/') { mod_path.all_after('/') } else { mod_path } // "os"
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out.writeln('module $mod_def\n')
// Consts
println(full_mod_path)
vfiles := os.walk_ext(full_mod_path, '.v')
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// mut vfiles := os.ls(full_mod_path) or {
// exit(1)
// }
filtered := vfiles.filter(it.ends_with('.v') && !it.ends_with('test.v') && !it.ends_with('_windows.v') && !it.ends_with('_win.v') && !it.ends_with('_lin.v') && !it.contains('${os.path_separator}examples') && !it.contains('_js.v') && !it.contains('_bare.v') && !it.contains('${os.path_separator}js')) // TODO merge once filter allows it
// println('f:')
// println(filtered)
mut v := new_v(['foo.v'])
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// v.pref.generating_vh = true
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mut g := VhGen{
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consts: strings.new_builder(1000)
fns: strings.new_builder(1000)
types: strings.new_builder(1000)
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}
for file in filtered {
mut p := v.new_parser_from_file(file)
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p.scanner.is_vh = true
p.parse(.decl)
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g.tokens = p.tokens
g.i = 0
for ; g.i < p.tokens.len; g.i++ {
if !p.tokens[g.i].tok.is_decl() {
continue
}
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match g.tokens[g.i].tok {
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.key_fn {
g.generate_fn()
}
.key_const {
g.generate_const()
}
.key_struct {
g.generate_type()
}
.key_type {
g.generate_alias()
}
else {
}}
}
}
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result := g.types.str() + g.consts.str() + g.fns.str().replace('\n\n\n', '\n').replace('\n\n', '\n')
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out.writeln(result.replace('[ ] ', '[]').replace('? ', '?'))
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out.close()
}
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fn (g mut VhGen) generate_fn() {
if g.i >= g.tokens.len - 2 {
return
}
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mut next := g.tokens[g.i + 1]
if g.i > 0 && g.tokens[g.i - 1].tok != .key_pub {
// Skip private fns
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// return ''
}
if next.tok == .name && next.lit == 'C' {
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// println('skipping C')
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return
}
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// out.write('pub ')
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mut tok := g.tokens[g.i]
for g.i < g.tokens.len - 1 && tok.tok != .lcbr {
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next = g.tokens[g.i + 1]
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g.fns.write(tok.str())
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if tok.tok != .lpar && !(next.tok in [.comma, .rpar]) {
// No space after (), [], etc
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g.fns.write(' ')
}
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g.i++
tok = g.tokens[g.i]
}
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g.fns.writeln('')
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// g.i--
}
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fn (g mut VhGen) generate_alias() {
mut tok := g.tokens[g.i]
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for g.i < g.tokens.len - 1 {
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g.types.write(tok.str())
g.types.write(' ')
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if tok.line_nr != g.tokens[g.i + 1].line_nr {
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break
}
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g.i++
tok = g.tokens[g.i]
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}
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g.types.writeln('\n')
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// g.i--
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}
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fn (g mut VhGen) generate_const() {
mut tok := g.tokens[g.i]
for g.i < g.tokens.len && tok.tok != .rpar {
g.consts.write(tok.str())
g.consts.write(' ')
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if g.tokens[g.i + 2].tok == .assign {
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g.consts.write('\n\t')
}
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g.i++
tok = g.tokens[g.i]
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}
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g.consts.writeln('\n)')
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// g.i--
}
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fn (g mut VhGen) generate_type() {
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// old := g.i
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mut tok := g.tokens[g.i]
for g.i < g.tokens.len && tok.tok != .rcbr {
g.types.write(tok.str())
g.types.write(' ')
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if g.tokens[g.i + 1].line_nr != g.tokens[g.i].line_nr {
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g.types.write('\n\t')
}
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g.i++
tok = g.tokens[g.i]
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}
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g.types.writeln('\n}')
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// g.i = old
// g.i--
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}
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