mirror of
https://github.com/go-gitea/gitea.git
synced 2024-12-27 10:38:11 +08:00
92 lines
2.6 KiB
Go
92 lines
2.6 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 (
|
||
|
|
"regexp"
|
||
|
|
"strings"
|
||
|
|
|
||
|
|
"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
|
||
|
|
)
|
||
|
|
|
||
|
|
var (
|
||
|
|
specCodePattern = regexp.MustCompile(`\/\*!(M?[0-9]{5,6})?([^*]|\*+[^*/])*\*+\/`)
|
||
|
|
specCodeStart = regexp.MustCompile(`^\/\*!(M?[0-9]{5,6} )?[ \t]*`)
|
||
|
|
specCodeEnd = regexp.MustCompile(`[ \t]*\*\/$`)
|
||
|
|
)
|
||
|
|
|
||
|
|
func trimComment(txt string) string {
|
||
|
|
txt = specCodeStart.ReplaceAllString(txt, "")
|
||
|
|
return specCodeEnd.ReplaceAllString(txt, "")
|
||
|
|
}
|
||
|
|
|
||
|
|
// See: http://dev.mysql.com/doc/refman/5.7/en/comments.html
|
||
|
|
// Convert "/*!VersionNumber MySQL-specific-code */" to "MySQL-specific-code".
|
||
|
|
// TODO: Find a better way:
|
||
|
|
// 1. RegExpr is slow.
|
||
|
|
// 2. Handle nested comment.
|
||
|
|
func handleMySQLSpecificCode(sql string) string {
|
||
|
|
if strings.Index(sql, "/*!") == -1 {
|
||
|
|
// Fast way to check if text contains MySQL-specific code.
|
||
|
|
return sql
|
||
|
|
}
|
||
|
|
// SQL text contains MySQL-specific code. We should convert it to normal SQL text.
|
||
|
|
return specCodePattern.ReplaceAllStringFunc(sql, trimComment)
|
||
|
|
}
|
||
|
|
|
||
|
|
// 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
|
||
|
|
}
|
||
|
|
sql = handleMySQLSpecificCode(sql)
|
||
|
|
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
|
||
|
|
}
|