ll1/flexgen/flexer_parser.go

package flexgen

import . "src.eruta.nl/beoran/ll1/grammar"
import "src.eruta.nl/beoran/ll1/parser"

func MakeFlexerGrammar() *Grammar {
	g := NewGrammar()
	dot := g.Term("dot", FlexgenKindDot)
	terminal := g.Term("terminal", FlexgenKindTerminal)
	arrow := g.Term("arrow", FlexgenKindArrow)
	action := g.Term("action", FlexgenKindAction)
	keyword := g.Term("keyword", FlexgenKindKeyword)
	keywordsRef := g.Ref("keywordsRef", "keywords")
	keywords := g.Opt("keywords", "", And(keyword, keywordsRef))
	literalString := g.Term("literalString", FlexgenKindLiteralString)
	literalRaw := g.Term("literalRaw", FlexgenKindLiteralRaw)
	literalChar := g.Term("literalChar", FlexgenKindLiteralChar)
	pattern := g.Alt("pattern", "", literalString, literalRaw, literalChar)
	optAction := g.Opt("optAction", "", action)
	lexeme := g.Seq("lexeme", "", terminal, arrow, pattern, keywords, optAction, dot)
	lexemesRef := g.Ref("lexemesRef", "lexemes")
	lexemes := g.Opt("lexemes", "", And(lexeme, lexemesRef))
	top := g.Seq("top", "", lexemes, End())
	g.Top = top
	return g
}

/* Parser for the flexer lexer .  */
func MakeFlexerParser() *parser.Parser {
	p := &parser.Parser{}
	p.TokenMapper = parser.DefaultMapper{}
	p.Grammar = *MakeFlexerGrammar()
	return p
}