63 lines
1.6 KiB
Go
63 lines
1.6 KiB
Go
// Copyright 2015 PingCAP, 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,
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package parser
|
|
|
|
import (
|
|
"github.com/juju/errors"
|
|
"github.com/pingcap/tidb/ast"
|
|
"github.com/pingcap/tidb/mysql"
|
|
"github.com/pingcap/tidb/terror"
|
|
)
|
|
|
|
// Error instances.
|
|
var (
|
|
ErrSyntax = terror.ClassParser.New(CodeSyntaxErr, "syntax error")
|
|
)
|
|
|
|
// Error codes.
|
|
const (
|
|
CodeSyntaxErr terror.ErrCode = 1
|
|
)
|
|
|
|
// Parse parses a query string to raw ast.StmtNode.
|
|
// If charset or collation is "", default charset and collation will be used.
|
|
func Parse(sql, charset, collation string) ([]ast.StmtNode, error) {
|
|
if charset == "" {
|
|
charset = mysql.DefaultCharset
|
|
}
|
|
if collation == "" {
|
|
collation = mysql.DefaultCollationName
|
|
}
|
|
l := NewLexer(sql)
|
|
l.SetCharsetInfo(charset, collation)
|
|
yyParse(l)
|
|
if len(l.Errors()) != 0 {
|
|
return nil, errors.Trace(l.Errors()[0])
|
|
}
|
|
return l.Stmts(), nil
|
|
}
|
|
|
|
// ParseOneStmt parses a query and returns an ast.StmtNode.
|
|
// The query must have one statement, otherwise ErrSyntax is returned.
|
|
func ParseOneStmt(sql, charset, collation string) (ast.StmtNode, error) {
|
|
stmts, err := Parse(sql, charset, collation)
|
|
if err != nil {
|
|
return nil, errors.Trace(err)
|
|
}
|
|
if len(stmts) != 1 {
|
|
return nil, ErrSyntax
|
|
}
|
|
return stmts[0], nil
|
|
}
|