119 lines
2.2 KiB
Go
119 lines
2.2 KiB
Go
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package treerack
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import (
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"fmt"
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"io"
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)
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const (
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charClassEscape = '\\'
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charClassBanned = "\\[]^-\b\f\n\r\t\v"
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)
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func newChar(
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name string,
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not bool,
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chars []rune,
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ranges [][]rune,
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) *charParser {
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return &charParser{
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name: name,
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not: not,
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chars: chars,
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ranges: ranges,
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}
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}
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func (p *charParser) setName(n string) { p.name = n }
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func (p *charParser) setID(id int) { p.id = id }
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func (p *charParser) setCommitType(ct CommitType) {}
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func (p *charParser) preinit() {}
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func (p *charParser) validate(*registry) error { return nil }
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func (p *charParser) init(*registry) {}
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func (p *charParser) addGeneralization(int) {}
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func (p *charParser) parser() parser { return p }
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func (p *charParser) builder() builder {
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return &charBuilder{
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id: p.id,
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name: p.name,
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}
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}
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func (p *charParser) isSingleChar() bool {
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return !p.not && len(p.chars) == 1 && len(p.ranges) == 0
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}
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func (p *charParser) format(_ *registry, f formatFlags) string {
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if p.not && len(p.chars) == 0 && len(p.ranges) == 0 {
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return "."
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}
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esc := func(c ...rune) []rune {
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return escape(charClassEscape, []rune(charClassBanned), c)
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}
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var s []rune
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s = append(s, '[')
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if p.not {
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s = append(s, '^')
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}
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s = append(s, esc(p.chars...)...)
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for i := range p.ranges {
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s = append(s, esc(p.ranges[i][0])...)
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s = append(s, '-')
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s = append(s, esc(p.ranges[i][1])...)
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}
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s = append(s, ']')
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return string(s)
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}
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func (p *charParser) generate(w io.Writer, done map[string]bool) error {
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if done[p.name] {
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return nil
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}
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done[p.name] = true
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var err error
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fprintf := func(f string, args ...interface{}) {
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if err != nil {
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return
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}
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_, err = fmt.Fprintf(w, f, args...)
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}
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fprintf("var p%d = charParser{", p.id)
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fprintf("id: %d, not: %t,", p.id, p.not)
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fprintf("chars: []rune{")
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for i := range p.chars {
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fprintf("%d,", p.chars[i])
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}
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fprintf("},")
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fprintf("ranges: [][]rune{")
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for i := range p.ranges {
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fprintf("{%d, %d},", p.ranges[i][0], p.ranges[i][1])
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}
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fprintf("}};")
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return err
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}
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func (b *charBuilder) generate(w io.Writer, done map[string]bool) error {
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if done[b.name] {
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return nil
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}
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done[b.name] = true
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_, err := fmt.Fprintf(w, "var b%d = charBuilder{};", b.id)
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return err
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}
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