package treerack const ( charClassEscape = '\\' charClassBanned = "\\[]^-\b\f\n\r\t\v" ) type charParser struct { name string id int not bool chars []rune ranges [][]rune generalizations []int } func newChar( name string, not bool, chars []rune, ranges [][]rune, ) *charParser { return &charParser{ name: name, not: not, chars: chars, ranges: ranges, } } func (p *charParser) nodeName() string { return p.name } func (p *charParser) setName(n string) { p.name = n } func (p *charParser) nodeID() int { return p.id } func (p *charParser) setID(id int) { p.id = id } func (p *charParser) commitType() CommitType { return Alias } func (p *charParser) setCommitType(ct CommitType) {} func (p *charParser) preinit() {} func (p *charParser) validate(*registry) error { return nil } func (p *charParser) init(*registry) {} func (p *charParser) addGeneralization(int) {} func (p *charParser) parser() parser { return p } func (p *charParser) builder() builder { return p } func (p *charParser) isSingleChar() bool { return !p.not && len(p.chars) == 1 && len(p.ranges) == 0 } func (p *charParser) format(_ *registry, f formatFlags) string { if p.not && len(p.chars) == 0 && len(p.ranges) == 0 { return "." } esc := func(c ...rune) []rune { return escape(charClassEscape, []rune(charClassBanned), c) } var s []rune s = append(s, '[') if p.not { s = append(s, '^') } s = append(s, esc(p.chars...)...) for i := range p.ranges { s = append(s, esc(p.ranges[i][0])...) s = append(s, '-') s = append(s, esc(p.ranges[i][1])...) } s = append(s, ']') return string(s) } func matchChars(chars []rune, ranges [][]rune, not bool, char rune) bool { for _, ci := range chars { if ci == char { return !not } } for _, ri := range ranges { if char >= ri[0] && char <= ri[1] { return !not } } return not } func (p *charParser) match(t rune) bool { return matchChars(p.chars, p.ranges, p.not, t) } func (p *charParser) parse(c *context) { if tok, ok := c.token(); !ok || !p.match(tok) { c.fail(c.offset) return } c.success(c.offset + 1) } func (p *charParser) build(c *context) ([]*Node, bool) { return nil, false }