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