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169 lines
6.2 KiB
169 lines
6.2 KiB
#if MYSQL_6_10
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// Copyright ?2004, 2016 Oracle and/or its affiliates. All rights reserved.
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//
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// MySQL Connector/NET is licensed under the terms of the GPLv2
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// <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most
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// MySQL Connectors. There are special exceptions to the terms and
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// conditions of the GPLv2 as it is applied to this software, see the
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// FLOSS License Exception
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// <http://www.mysql.com/about/legal/licensing/foss-exception.html>.
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published
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// by the Free Software Foundation; version 2 of the License.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with this program; if not, write to the Free Software Foundation, Inc.,
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// 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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using System;
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using System.Collections;
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using System.Text;
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namespace Externals.MySql.Data.Common
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{
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internal class ContextString
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{
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readonly bool _escapeBackslash;
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// Create a private ctor so the compiler doesn't give us a default one
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public ContextString(string contextMarkers, bool escapeBackslash)
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{
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ContextMarkers = contextMarkers;
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_escapeBackslash = escapeBackslash;
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}
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public string ContextMarkers { get; set; }
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public int IndexOf(string src, string target)
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{
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return IndexOf(src, target, 0);
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}
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public int IndexOf(string src, string target, int startIndex)
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{
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int index = src.IndexOf(target, startIndex);
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while (index != -1)
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{
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if (!IndexInQuotes(src, index, startIndex)) break;
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index = src.IndexOf(target, index + 1);
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}
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return index;
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}
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private bool IndexInQuotes(string src, int index, int startIndex)
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{
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char contextMarker = Char.MinValue;
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bool escaped = false;
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for (int i = startIndex; i < index; i++)
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{
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char c = src[i];
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int contextIndex = ContextMarkers.IndexOf(c);
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// if we have found the closing marker for our open marker, then close the context
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if (contextIndex > -1 && contextMarker == ContextMarkers[contextIndex] && !escaped)
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contextMarker = Char.MinValue;
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// if we have found a context marker and we are not in a context yet, then start one
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else if (contextMarker == Char.MinValue && contextIndex > -1 && !escaped)
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contextMarker = c;
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else if (c == '\\' && _escapeBackslash)
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escaped = !escaped;
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}
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return contextMarker != Char.MinValue || escaped;
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}
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public int IndexOf(string src, char target)
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{
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char contextMarker = Char.MinValue;
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bool escaped = false;
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int pos = 0;
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foreach (char c in src)
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{
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int contextIndex = ContextMarkers.IndexOf(c);
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// if we have found the closing marker for our open marker, then close the context
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if (contextIndex > -1 && contextMarker == ContextMarkers[contextIndex] && !escaped)
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contextMarker = Char.MinValue;
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// if we have found a context marker and we are not in a context yet, then start one
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else if (contextMarker == Char.MinValue && contextIndex > -1 && !escaped)
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contextMarker = c;
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else if (contextMarker == Char.MinValue && c == target)
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return pos;
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else if (c == '\\' && _escapeBackslash)
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escaped = !escaped;
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pos++;
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}
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return -1;
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}
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public string[] Split(string src, string delimiters)
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{
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ArrayList parts = new ArrayList();
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StringBuilder sb = new StringBuilder();
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bool escaped = false;
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char contextMarker = Char.MinValue;
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foreach (char c in src)
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{
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if (delimiters.IndexOf(c) != -1 && !escaped)
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{
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if (contextMarker != Char.MinValue)
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sb.Append(c);
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else
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{
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if (sb.Length <= 0) continue;
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parts.Add(sb.ToString());
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sb.Remove(0, sb.Length);
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}
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}
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else if (c == '\\' && _escapeBackslash)
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escaped = !escaped;
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else
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{
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int contextIndex = ContextMarkers.IndexOf(c);
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if (!escaped && contextIndex != -1)
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{
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// if we have found the closing marker for our open
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// marker, then close the context
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if ((contextIndex % 2) == 1)
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{
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if (contextMarker == ContextMarkers[contextIndex - 1])
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contextMarker = Char.MinValue;
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}
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else
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{
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// if the opening and closing context markers are
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// the same then we will always find the opening
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// marker.
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if (contextMarker == ContextMarkers[contextIndex + 1])
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contextMarker = Char.MinValue;
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else if (contextMarker == Char.MinValue)
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contextMarker = c;
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}
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}
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sb.Append(c);
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}
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}
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if (sb.Length > 0)
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parts.Add(sb.ToString());
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return (string[])parts.ToArray(typeof(string));
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}
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}
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}
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#endif
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