63 lines
1.7 KiB
Go
63 lines
1.7 KiB
Go
// Copyright 2015 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package parser
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import (
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"github.com/juju/errors"
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"github.com/pingcap/tidb/ast"
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"github.com/pingcap/tidb/mysql"
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"github.com/pingcap/tidb/terror"
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)
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// Error instances.
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var (
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ErrSyntax = terror.ClassParser.New(CodeSyntaxErr, "syntax error")
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)
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// Error codes.
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const (
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CodeSyntaxErr terror.ErrCode = iota + 1
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)
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// Parse parses a query string to raw ast.StmtNode.
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// If charset or collation is "", default charset and collation will be used.
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func Parse(sql, charset, collation string) ([]ast.StmtNode, error) {
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if charset == "" {
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charset = mysql.DefaultCharset
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}
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if collation == "" {
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collation = mysql.DefaultCollationName
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}
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l := NewLexer(sql)
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l.SetCharsetInfo(charset, collation)
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yyParse(l)
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if len(l.Errors()) != 0 {
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return nil, errors.Trace(l.Errors()[0])
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}
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return l.Stmts(), nil
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}
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// ParseOneStmt parses a query and returns an ast.StmtNode.
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// The query must have one statement, otherwise ErrSyntax is returned.
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func ParseOneStmt(sql, charset, collation string) (ast.StmtNode, error) {
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stmts, err := Parse(sql, charset, collation)
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if err != nil {
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return nil, errors.Trace(err)
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}
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if len(stmts) != 1 {
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return nil, ErrSyntax
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}
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return stmts[0], nil
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}
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