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v/vlib/compiler/vfmt.v
Alexander Medvednikov ffa6bcfff5 vfmt: handle comments
2019-11-13 11:54:22 +03:00

174 lines
3.3 KiB
V

// 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
import strings
import os
[if vfmt]
fn (scanner mut Scanner) fgen(s_ string) {
mut s := s_
if scanner.fmt_line_empty {
s = strings.repeat(`\t`, scanner.fmt_indent) + s
}
//scanner.fmt_out << s
scanner.fmt_out.write(s)
scanner.fmt_line_empty = false
}
[if vfmt]
fn (scanner mut Scanner) fgenln(s_ string) {
mut s := s_
if scanner.fmt_line_empty && scanner.fmt_indent > 0 {
s = strings.repeat(`\t`, scanner.fmt_indent) + s
}
//scanner.fmt_out << s
//scanner.fmt_out << '\n'
scanner.fmt_out.writeln(s)
scanner.fmt_line_empty = true
}
[if vfmt]
fn (p mut Parser) fgen(s string) {
if p.pass != .main {
return
}
p.scanner.fgen(s)
}
[if vfmt]
fn (p mut Parser) fspace() {
if p.first_pass() {
return
}
p.fgen(' ')
}
[if vfmt]
fn (p mut Parser) fgenln(s string) {
if p.pass != .main {
return
}
p.scanner.fgenln(s)
}
/*
fn (p mut Parser) peek() TokenKind {
for {
p.cgen.line = p.scanner.line_nr + 1
tok := p.scanner.peek()
if tok != .nl {
return tok
}
}
return .eof // TODO can never get here - v doesn't know that
}
*/
[if vfmt]
fn (p mut Parser) fmt_inc() {
if p.pass != .main {
return
}
p.scanner.fmt_indent++
}
[if vfmt]
fn (p mut Parser) fmt_dec() {
if p.pass != .main {
return
}
p.scanner.fmt_indent--
}
[if vfmt]
fn (p mut Scanner) init_fmt() {
// Right now we can't do `$if vfmt {`, so I'm using
// a conditional function init_fmt to set this flag.
// This function will only be called if `-d vfmt` is passed.
p.is_fmt = true
}
[if vfmt]
fn (p mut Parser) fnext() {
//if p.tok == .eof {
//println('eof ret')
//return
//}
if p.tok == .rcbr && !p.inside_if_expr && p.prev_tok != .lcbr {
p.fmt_dec()
}
mut s := p.strtok()
if p.tok != .eof {
p.fgen(s)
}
// vfmt: increase indentation on `{` unless it's `{}`
if p.tok == .lcbr && !p.inside_if_expr && p.peek() != .rcbr {
p.fgenln('')
p.fmt_inc()
}
// Skip comments and add them to vfmt output
if p.tokens[p.token_idx].tok in [.line_comment, .mline_comment] {
// Newline before the comment and after consts and closing }
if p.inside_const {
p.fgenln('\n')
}
if p.tok == .rcbr {
p.fgenln('')
}
for p.token_idx < p.tokens.len - 1 {
tok := p.tokens[p.token_idx].tok
if tok != .line_comment && tok != .mline_comment {
break
}
comment_token := p.tokens[p.token_idx]
comment := comment_token.lit
if p.token_idx > 0 && comment_token.line_nr > p.tokens[p.token_idx-1].line_nr {
//p.fgenln('')
}
if tok == .line_comment {
p.fgen('// ' + comment)
} else {
p.fgen(comment)
}
if p.token_idx > 0 &&
comment_token.line_nr < p.tokens[p.token_idx+1].line_nr
{
p.fgenln('')
}
p.token_idx++
}
}
}
[if vfmt]
fn (p mut Parser) gen_fmt() {
if p.pass != .main {
return
}
if p.file_name == '' {
return
}
//s := p.scanner.fmt_out.str().replace('\n\n\n', '\n').trim_space()
s := p.scanner.fmt_out.str().trim_space()
//s := p.scanner.fmt_out.join('').trim_space()
if s == '' {
return
}
println('GENERATING ${p.file_name}.V')
out := os.create('/var/tmp/fmt/' + p.file_name) or {
verror('failed to create fmt.v')
return
}
out.writeln(s)//p.scanner.fmt_out.str().trim_space())
out.close()
}