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// Copyright (c) 2004-2008 MySQL AB, 2008-2009 Sun Microsystems, Inc.
//
// 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;
using System.Text;
namespace MySql.Data.Common
{
internal class ContextString
{
string contextMarkers;
bool escapeBackslash;
// Create a private ctor so the compiler doesn't give us a default one
public ContextString(string contextMarkers, bool escapeBackslash)
{
this.contextMarkers = contextMarkers;
this.escapeBackslash = escapeBackslash;
}
public string ContextMarkers
{
get { return contextMarkers; }
set { contextMarkers = value; }
}
public int IndexOf(string src, string target)
{
return IndexOf(src, target, 0);
}
public int IndexOf(string src, string target, int startIndex)
{
int index = src.IndexOf(target, startIndex);
while (index != -1)
{
if (!IndexInQuotes(src, index, startIndex)) break;
index = src.IndexOf(target, index + 1);
}
return index;
}
private bool IndexInQuotes(string src, int index, int startIndex)
{
char contextMarker = Char.MinValue;
bool escaped = false;
for (int i = startIndex; i < index; i++)
{
char c = src[i];
int contextIndex = contextMarkers.IndexOf(c);
// if we have found the closing marker for our open marker, then close the context
if (contextIndex > -1 && contextMarker == contextMarkers[contextIndex] && !escaped)
contextMarker = Char.MinValue;
// if we have found a context marker and we are not in a context yet, then start one
else if (contextMarker == Char.MinValue && contextIndex > -1 && !escaped)
contextMarker = c;
else if (c == '\\' && escapeBackslash)
escaped = !escaped;
}
return contextMarker != Char.MinValue || escaped;
}
public int IndexOf(string src, char target)
{
char contextMarker = Char.MinValue;
bool escaped = false;
int pos = 0;
foreach (char c in src)
{
int contextIndex = contextMarkers.IndexOf(c);
// if we have found the closing marker for our open marker, then close the context
if (contextIndex > -1 && contextMarker == contextMarkers[contextIndex] && !escaped)
contextMarker = Char.MinValue;
// if we have found a context marker and we are not in a context yet, then start one
else if (contextMarker == Char.MinValue && contextIndex > -1 && !escaped)
contextMarker = c;
else if (contextMarker == Char.MinValue && c == target)
return pos;
else if (c == '\\' && escapeBackslash)
escaped = !escaped;
pos++;
}
return -1;
}
public string[] Split(string src, string delimiters)
{
ArrayList parts = new ArrayList();
StringBuilder sb = new StringBuilder();
bool escaped = false;
char contextMarker = Char.MinValue;
foreach (char c in src)
{
if (delimiters.IndexOf(c) != -1 && !escaped)
{
if (contextMarker != Char.MinValue)
sb.Append(c);
else
{
if (sb.Length > 0)
{
parts.Add( sb.ToString() );
sb.Remove( 0, sb.Length );
}
}
}
else if (c == '\\' && escapeBackslash)
escaped = !escaped;
else
{
int contextIndex = contextMarkers.IndexOf(c);
if (!escaped && contextIndex != -1)
{
// if we have found the closing marker for our open
// marker, then close the context
if ((contextIndex % 2) == 1)
{
if (contextMarker == contextMarkers[contextIndex - 1])
contextMarker = Char.MinValue;
}
else
{
// if the opening and closing context markers are
// the same then we will always find the opening
// marker.
if (contextMarker == contextMarkers[contextIndex + 1])
contextMarker = Char.MinValue;
else if (contextMarker == Char.MinValue)
contextMarker = c;
}
}
sb.Append( c );
}
}
if (sb.Length > 0)
parts.Add( sb.ToString() );
return (string[])parts.ToArray( typeof(string) );
}
}
}
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