106 lines
2.1 KiB
Go
106 lines
2.1 KiB
Go
package treerack
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type charParser struct {
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name string
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id int
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not bool
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chars []rune
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ranges [][]rune
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includedBy []int
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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) nodeName() string { return p.name }
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func (p *charParser) nodeID() int { return p.id }
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func (p *charParser) setID(id int) { p.id = id }
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func (p *charParser) commitType() CommitType { return Alias }
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func (p *charParser) validate(*registry, *idSet) error { return nil }
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func (p *charParser) normalize(*registry, *idSet) error { return nil }
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func (p *charParser) init(r *registry) error { return nil }
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func (p *charParser) setIncludedBy(r *registry, includedBy int, parsers *idSet) error {
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p.includedBy = appendIfMissing(p.includedBy, includedBy)
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return nil
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}
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func (p *charParser) parser(r *registry, parsers *idSet) (parser, error) {
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if parsers.has(p.id) {
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panic(cannotIncludeParsers(p.name))
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}
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if _, ok := r.parser(p.name); ok {
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return p, nil
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}
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r.setParser(p)
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return p, nil
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}
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func (p *charParser) builder() builder {
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return p
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}
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func (p *charParser) match(t rune) bool {
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for _, ci := range p.chars {
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if ci == t {
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return !p.not
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}
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}
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for _, ri := range p.ranges {
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if t >= ri[0] && t <= ri[1] {
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return !p.not
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}
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}
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return p.not
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}
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func (p *charParser) parse(t Trace, c *context) {
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t = t.Extend(p.name)
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t.Out1("parsing", c.offset)
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if tok, ok := c.token(); !ok || !p.match(tok) {
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t.Out1("fail")
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c.fail(c.offset)
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return
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}
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t.Out1("success")
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c.success(c.offset + 1)
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for _, includedBy := range p.includedBy {
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c.store.setMatch(c.offset, includedBy, c.offset+1)
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}
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}
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func (p *charParser) build(c *context) ([]*Node, bool) {
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panic("called char build")
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// // TODO: how to remove this check
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// t, ok := c.token()
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// if !ok {
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// panic("damaged parser context")
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// }
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// if !p.match(t) {
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// return nil, false
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// }
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// // always alias
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// c.offset++
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// return nil, true
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}
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