75 lines
1.8 KiB
Go
75 lines
1.8 KiB
Go
// Copyright (c) 2014 Couchbase, Inc.
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
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// except in compliance with the License. You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software distributed under the
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// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
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// either express or implied. See the License for the specific language governing permissions
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// and limitations under the License.
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//go:generate go tool yacc -o query_string.y.go query_string.y
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//go:generate sed -i.tmp -e 1d query_string.y.go
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//go:generate rm query_string.y.go.tmp
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// note: OSX sed and gnu sed handle the -i (in-place) option differently.
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// using -i.tmp works on both, at the expense of having to remove
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// the unsightly .tmp files
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package query
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import (
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"fmt"
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"strings"
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)
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var debugParser bool
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var debugLexer bool
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func parseQuerySyntax(query string) (rq Query, err error) {
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lex := newLexerWrapper(newQueryStringLex(strings.NewReader(query)))
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doParse(lex)
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if len(lex.errs) > 0 {
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return nil, fmt.Errorf(strings.Join(lex.errs, "\n"))
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}
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return lex.query, nil
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}
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func doParse(lex *lexerWrapper) {
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defer func() {
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r := recover()
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if r != nil {
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lex.errs = append(lex.errs, fmt.Sprintf("parse error: %v", r))
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}
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}()
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yyParse(lex)
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}
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const (
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queryShould = iota
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queryMust
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queryMustNot
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)
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type lexerWrapper struct {
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lex yyLexer
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errs []string
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query *BooleanQuery
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}
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func newLexerWrapper(lex yyLexer) *lexerWrapper {
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return &lexerWrapper{
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lex: lex,
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query: NewBooleanQuery(nil, nil, nil),
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}
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}
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func (l *lexerWrapper) Lex(lval *yySymType) int {
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return l.lex.Lex(lval)
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}
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func (l *lexerWrapper) Error(s string) {
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l.errs = append(l.errs, s)
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}
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