1 files changed, 0 insertions, 190 deletions
diff --git a/libgo/go/exp/ebnf/parser.go b/libgo/go/exp/ebnf/parser.go
deleted file mode 100644
index 7a7e3cc..0000000
--- a/libgo/go/exp/ebnf/parser.go
+++ /dev/null
@@ -1,190 +0,0 @@
-// Copyright 2009 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package ebnf
-
-import (
-	"io"
-	"strconv"
-	"text/scanner"
-)
-
-type parser struct {
-	errors  errorList
-	scanner scanner.Scanner
-	pos     scanner.Position // token position
-	tok     rune             // one token look-ahead
-	lit     string           // token literal
-}
-
-func (p *parser) next() {
-	p.tok = p.scanner.Scan()
-	p.pos = p.scanner.Position
-	p.lit = p.scanner.TokenText()
-}
-
-func (p *parser) error(pos scanner.Position, msg string) {
-	p.errors = append(p.errors, newError(pos, msg))
-}
-
-func (p *parser) errorExpected(pos scanner.Position, msg string) {
-	msg = `expected "` + msg + `"`
-	if pos.Offset == p.pos.Offset {
-		// the error happened at the current position;
-		// make the error message more specific
-		msg += ", found " + scanner.TokenString(p.tok)
-		if p.tok < 0 {
-			msg += " " + p.lit
-		}
-	}
-	p.error(pos, msg)
-}
-
-func (p *parser) expect(tok rune) scanner.Position {
-	pos := p.pos
-	if p.tok != tok {
-		p.errorExpected(pos, scanner.TokenString(tok))
-	}
-	p.next() // make progress in any case
-	return pos
-}
-
-func (p *parser) parseIdentifier() *Name {
-	pos := p.pos
-	name := p.lit
-	p.expect(scanner.Ident)
-	return &Name{pos, name}
-}
-
-func (p *parser) parseToken() *Token {
-	pos := p.pos
-	value := ""
-	if p.tok == scanner.String {
-		value, _ = strconv.Unquote(p.lit)
-		// Unquote may fail with an error, but only if the scanner found
-		// an illegal string in the first place. In this case the error
-		// has already been reported.
-		p.next()
-	} else {
-		p.expect(scanner.String)
-	}
-	return &Token{pos, value}
-}
-
-// ParseTerm returns nil if no term was found.
-func (p *parser) parseTerm() (x Expression) {
-	pos := p.pos
-
-	switch p.tok {
-	case scanner.Ident:
-		x = p.parseIdentifier()
-
-	case scanner.String:
-		tok := p.parseToken()
-		x = tok
-		const ellipsis = '…' // U+2026, the horizontal ellipsis character
-		if p.tok == ellipsis {
-			p.next()
-			x = &Range{tok, p.parseToken()}
-		}
-
-	case '(':
-		p.next()
-		x = &Group{pos, p.parseExpression()}
-		p.expect(')')
-
-	case '[':
-		p.next()
-		x = &Option{pos, p.parseExpression()}
-		p.expect(']')
-
-	case '{':
-		p.next()
-		x = &Repetition{pos, p.parseExpression()}
-		p.expect('}')
-	}
-
-	return x
-}
-
-func (p *parser) parseSequence() Expression {
-	var list Sequence
-
-	for x := p.parseTerm(); x != nil; x = p.parseTerm() {
-		list = append(list, x)
-	}
-
-	// no need for a sequence if list.Len() < 2
-	switch len(list) {
-	case 0:
-		p.errorExpected(p.pos, "term")
-		return &Bad{p.pos, "term expected"}
-	case 1:
-		return list[0]
-	}
-
-	return list
-}
-
-func (p *parser) parseExpression() Expression {
-	var list Alternative
-
-	for {
-		list = append(list, p.parseSequence())
-		if p.tok != '|' {
-			break
-		}
-		p.next()
-	}
-	// len(list) > 0
-
-	// no need for an Alternative node if list.Len() < 2
-	if len(list) == 1 {
-		return list[0]
-	}
-
-	return list
-}
-
-func (p *parser) parseProduction() *Production {
-	name := p.parseIdentifier()
-	p.expect('=')
-	var expr Expression
-	if p.tok != '.' {
-		expr = p.parseExpression()
-	}
-	p.expect('.')
-	return &Production{name, expr}
-}
-
-func (p *parser) parse(filename string, src io.Reader) Grammar {
-	p.scanner.Init(src)
-	p.scanner.Filename = filename
-	p.next() // initializes pos, tok, lit
-
-	grammar := make(Grammar)
-	for p.tok != scanner.EOF {
-		prod := p.parseProduction()
-		name := prod.Name.String
-		if _, found := grammar[name]; !found {
-			grammar[name] = prod
-		} else {
-			p.error(prod.Pos(), name+" declared already")
-		}
-	}
-
-	return grammar
-}
-
-// Parse parses a set of EBNF productions from source src.
-// It returns a set of productions. Errors are reported
-// for incorrect syntax and if a production is declared
-// more than once; the filename is used only for error
-// positions.
-//
-func Parse(filename string, src io.Reader) (Grammar, error) {
-	var p parser
-	grammar := p.parse(filename, src)
-	return grammar, p.errors.Err()
-}