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n1ql_parser.go
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n1ql_parser.go
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// Copyright (c) 2013 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.
package goyacc
import (
"fmt"
"strings"
"sync"
"github.com/couchbaselabs/tuqtng/ast"
)
var parsingStack *Stack
var parsingStatement ast.Statement
var crashHard = false
type N1qlParser struct {
mutex sync.Mutex
}
func NewN1qlParser() *N1qlParser {
return &N1qlParser{}
}
func NewN1qlParserWithDebug(debug int) *N1qlParser {
yyDebug = debug
return &N1qlParser{}
}
func (u *N1qlParser) Parse(input string) (returnStatement ast.Statement, err error) {
u.mutex.Lock()
defer u.mutex.Unlock()
parsingStack = new(Stack)
parsingStatement = ast.NewSelectStatement()
defer func() {
r := recover()
if r != nil && r == "syntax error" {
// if we're panicing over a syntax error, chill
err = fmt.Errorf("Parse Error - %v", r)
} else if r != nil {
// otherise continue to panic
if crashHard {
panic(r)
} else {
err = fmt.Errorf("Other Error - %v", r)
}
}
}()
yyParse(NewLexer(strings.NewReader(input)))
returnStatement = parsingStatement
return
}