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v/vlib/compiler/vfmt.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 strings
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import os
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[if vfmt]
fn (scanner mut Scanner) fgen(s_ string) {
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mut s := s_
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if scanner.fmt_line_empty {
s = strings.repeat(`\t`, scanner.fmt_indent) + s
}
//scanner.fmt_out << s
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scanner.fmt_out.write(s)
scanner.fmt_line_empty = false
}
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[if vfmt]
fn (scanner mut Scanner) fgenln(s_ string) {
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mut s := s_
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if scanner.fmt_line_empty && scanner.fmt_indent > 0 {
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s = strings.repeat(`\t`, scanner.fmt_indent) + s
}
//scanner.fmt_out << s
//scanner.fmt_out << '\n'
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scanner.fmt_out.writeln(s)
scanner.fmt_line_empty = true
}
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[if vfmt]
fn (scanner mut Scanner) fgen_nl() {
scanner.fmt_out.writeln('')
scanner.fmt_line_empty = true
}
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[if vfmt]
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fn (p mut Parser) fgen(s string) {
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if p.pass != .main {
return
}
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p.scanner.fgen(s)
}
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[if vfmt]
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fn (p mut Parser) fspace() {
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if p.first_pass() {
return
}
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p.fgen(' ')
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}
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[if vfmt]
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fn (p mut Parser) fgenln(s string) {
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if p.pass != .main {
return
}
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p.scanner.fgenln(s)
}
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[if vfmt]
fn (p mut Parser) fgen_nl() {
if p.pass != .main {
return
}
println(p.tok)
if p.prev_tok == .line_comment {
return
}
p.scanner.fgen_nl()
}
/*
fn (p mut Parser) peek() TokenKind {
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for {
p.cgen.line = p.scanner.line_nr + 1
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tok := p.scanner.peek()
if tok != .nl {
return tok
}
}
return .eof // TODO can never get here - v doesn't know that
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}
*/
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[if vfmt]
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fn (p mut Parser) fmt_inc() {
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if p.pass != .main {
return
}
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p.scanner.fmt_indent++
}
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[if vfmt]
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fn (p mut Parser) fmt_dec() {
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if p.pass != .main {
return
}
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p.scanner.fmt_indent--
}
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[if vfmt]
fn (p mut Scanner) init_fmt() {
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// 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.
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p.is_fmt = true
}
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[if vfmt]
fn (p mut Parser) fnext() {
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//if p.tok == .eof {
//println('eof ret')
//return
//}
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if p.tok == .rcbr && !p.inside_if_expr && p.prev_tok != .lcbr {
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p.fmt_dec()
}
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mut s := p.strtok()
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if p.tok != .eof {
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p.fgen(s)
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}
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// vfmt: increase indentation on `{` unless it's `{}`
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mut inc_indent := false
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if p.tok == .lcbr && !p.inside_if_expr && p.peek() != .rcbr {
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p.fgen_nl()
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p.fmt_inc()
}
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// 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 {
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p.fgen_nl()
p.fgen_nl()
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}
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is_rcbr := p.tok == .rcbr
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for p.token_idx < p.tokens.len - 1 {
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i := p.token_idx
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tok := p.tokens[p.token_idx].tok
if tok != .line_comment && tok != .mline_comment {
break
}
comment_token := p.tokens[p.token_idx]
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next := p.tokens[p.token_idx+1]
comment_on_new_line := p.token_idx == 0 ||
comment_token.line_nr > p.tokens[p.token_idx - 1].line_nr
//prev_token := p.tokens[p.token_idx - 1]
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comment := comment_token.lit
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if i > 0 && p.tokens[i-1].tok != .line_comment &&
comment_token.line_nr > p.tokens[i-1].line_nr {
p.fgen_nl()
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}
if tok == .line_comment {
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if !comment_on_new_line { //prev_token.line_nr < comment_token.line_nr {
p.fgen(' ')
}
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p.fgen('// ' + comment)
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/*
if false && i > 0 {
p.fgen(
'pln=${p.tokens[i-1].line_nr} ${comment_token.str()} ' +
'line_nr=$comment_token.line_nr next=${next.str()} next_line_nr=$next.line_nr')
}
*/
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} else {
p.fgen(comment)
}
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if next.tok == .line_comment && comment_token.line_nr < next.line_nr {
p.fgen_nl()
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}
p.token_idx++
}
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if inc_indent {
p.fgen_nl()
}
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}
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}
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[if vfmt]
fn (p mut Parser) gen_fmt() {
if p.pass != .main {
return
}
if p.file_name == '' {
return
}
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//s := p.scanner.fmt_out.str().replace('\n\n\n', '\n').trim_space()
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s := p.scanner.fmt_out.str().trim_space()
//s := p.scanner.fmt_out.join('').trim_space()
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if s == '' {
return
}
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println('generating ${p.file_name}.v')
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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())
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out.close()
}