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// Copyright © 2008, 2010, Oracle and/or its affiliates. All rights reserved.
//
// MySQL Connector/NET is licensed under the terms of the GPLv2
// <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most
// MySQL Connectors. There are special exceptions to the terms and
// conditions of the GPLv2 as it is applied to this software, see the
// FLOSS License Exception
// <http://www.mysql.com/about/legal/licensing/foss-exception.html>.
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published
// by the Free Software Foundation; version 2 of the License.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
using System;
using System.Collections.Generic;
using System.Text;
namespace MySql.Data.VisualStudio
{
class Tokenizer
{
private string text;
private int Pos;
private string LastToken;
private int _startIndex;
private int _stopIndex;
private bool _lineComment;
private bool _quoted;
public bool AnsiQuotes = false;
public bool BackslashEscapes = true;
public bool ReturnComments;
public bool BlockComment;
#region Properties
public string Text
{
get { return text; }
set { text = value; Pos = 0; }
}
public int StartIndex
{
get { return _startIndex; }
private set { _startIndex = value; }
}
public int StopIndex
{
get { return _stopIndex; }
private set { _stopIndex = value; }
}
public bool LineComment
{
get { return _lineComment; }
private set { _lineComment = value; }
}
public bool Quoted
{
get { return _quoted; }
private set { _quoted = value; }
}
#endregion
public string NextToken()
{
if (LastToken == "*/" && BlockComment)
BlockComment = false;
LastToken = GetNextToken();
return LastToken;
}
private string GetNextToken()
{
if (Text == null) return null;
StartIndex = StopIndex = 0;
Quoted = false;
LineComment = false;
while (Pos < Text.Length)
{
if (BlockComment)
return ExtractComment();
char c = Text[Pos++];
if (Char.IsWhiteSpace(c) && StartIndex == 0) continue;
StartIndex = Pos - 1;
if (IsQuoteCharacter(c) && !BlockComment)
return ExtractQuotedToken(c);
string comment = ReadComment(c);
if (comment != null && ReturnComments) return comment;
return ExtractUnquotedToken();
}
return null;
}
#region Private methods
private string ReadComment(char startingChar)
{
if (startingChar != '/' && startingChar != '#' && startingChar != '-') return null;
if (startingChar == '-' && Text.Length == (Pos + 1)) return null;
if (startingChar == '/' && Text.Length == Pos) return null;
if ((startingChar == '-' && Text[Pos] == '-' && Text[Pos+1] == ' ') ||
startingChar == '#')
{
LineComment = true;
return ExtractComment();
}
if (startingChar == '/' && Text[Pos] == '*')
{
BlockComment = true;
return ExtractComment();
}
return null;
}
private string ExtractComment()
{
char lastChar = Char.MinValue;
while (Pos < Text.Length)
{
char c = Text[Pos++];
if ((c == '\n' && LineComment) ||
(c == '/' && lastChar == '*' && BlockComment))
return ExtractToken(true);
lastChar = c;
}
return ExtractToken(false);
}
private string ExtractUnquotedToken()
{
while (Pos < Text.Length)
{
char c = Text[Pos++];
if (IsTokenTerminator(c))
return ExtractToken(true);
}
return ExtractToken(false);
}
private string ExtractQuotedToken(char quoteChar)
{
bool escaped = false;
while (Pos < Text.Length)
{
char c = Text[Pos++];
if (c == quoteChar && !escaped)
{
Quoted = true;
return ExtractToken(true);
}
if (escaped) escaped = false;
if (c == '\\' && BackslashEscapes)
escaped = true;
}
return ExtractToken(false);
}
private bool IsQuoteCharacter(char c)
{
return c == '\'' || c == '`' || (c == '\"' && AnsiQuotes);
}
private bool IsTokenTerminator(char c)
{
if (c == '\n') return true;
if (c == '#' || c == '-' || c == '/' || c == '\\') return true;
if (c == '(' || c == ',') return true;
if (Char.IsWhiteSpace(c)) return true;
return false;
}
private string ExtractToken(bool preserveLast)
{
StopIndex = Math.Min(Text.Length-1, Pos - 1);
if (preserveLast) Pos--;
return Text.Substring(StartIndex, StopIndex - StartIndex+1);
//if (Pos < Text.Length)
// return Text.Substring(StartIndex, StopIndex - StartIndex + 1);
//StopIndex = Pos;
//return Text.Substring(StartIndex, StopIndex - StartIndex);
}
#endregion
}
}
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