5023993895
this improvement was started to improve code coverage
but also improves performance and adds support for escaping
escaping:
The following quoted string enumerates the characters which
may be escaped.
"+-=&|><!(){}[]^\"~*?:\\/ "
Note that this list includes space.
In order to escape these characters, they are prefixed with the \
(backslash) character. In all cases, using the escaped version
produces the character itself and is not interpretted by the
lexer.
Two simple examples:
my\ name
Will be interpretted as a single argument to a match query
with the value "my name".
"contains a\" character"
Will be interpretted as a single argument to a phrase query
with the value `contains a " character`.
Performance:
before$ go test -v -run=xxx -bench=BenchmarkLexer
BenchmarkLexer-4 100000 13991 ns/op
PASS
ok github.com/blevesearch/bleve 1.570s
after$ go test -v -run=xxx -bench=BenchmarkLexer
BenchmarkLexer-4 500000 3387 ns/op
PASS
ok github.com/blevesearch/bleve 1.740s
70 lines
1.6 KiB
Go
70 lines
1.6 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 "" -e 1d query_string.y.go
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package bleve
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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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