snapshot of https://github.com/blevesearch/bleve.git (master, 2026-09-15; blobs > 131072B omitted)

search/query/query_string_parser.go

@@ -0,0 +1,87 @@
+//  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
+	}
+	qsl := getQueryStringLex(strings.NewReader(query))
+	defer putQueryStringLex(qsl)
+	lex := newLexerWrapper(qsl)
+	doParse(lex)
+
+	if len(lex.errs) > 0 {
+		return nil, fmt.Errorf("%s", 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)
+}