/*
 * Copyright (c) 2007-2014 by Evernote Corporation, All rights reserved.
 *
 * Use of the source code and binary libraries included in this package
 * is permitted under the following terms:
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#import "NSString+XMLAdditions.h"

@implementation NSString (XMLAdditions)

// see .h
- (NSString *) stringByEscapingCriticalXMLEntities
{
  NSMutableString * mutable = [NSMutableString stringWithString:self];
  [mutable replaceOccurrencesOfString: @"&"
                           withString: @"&"
                              options: NSLiteralSearch
                                range: NSMakeRange(0, mutable.length)];
  [mutable replaceOccurrencesOfString: @"<"
                           withString: @"&lt;"
                              options: NSLiteralSearch
                                range: NSMakeRange(0, mutable.length)];
  [mutable replaceOccurrencesOfString: @">"
                           withString: @"&gt;"
                              options: NSLiteralSearch
                                range: NSMakeRange(0, mutable.length)];
  [mutable replaceOccurrencesOfString: @"'"
                           withString: @"&#x27;"
                              options: NSLiteralSearch
                                range: NSMakeRange(0, mutable.length)];
  [mutable replaceOccurrencesOfString: @"\""
                           withString: @"&quot;"
                              options: NSLiteralSearch
                                range: NSMakeRange(0, mutable.length)];
  return mutable;
}

- (NSString *) stringByUnescapingCrititcalXMLEntities
{
  NSMutableString *mutable = [NSMutableString stringWithString:self];
  [mutable replaceOccurrencesOfString:@"&amp;"
                           withString:@"&"
                              options:NSLiteralSearch
                                range:NSMakeRange(0, mutable.length)];
  [mutable replaceOccurrencesOfString:@"&lt;"
                           withString:@"<"
                              options:NSLiteralSearch
                                range:NSMakeRange(0, mutable.length)];
  [mutable replaceOccurrencesOfString:@"&gt;"
                           withString:@">"
                              options:NSLiteralSearch
                                range:NSMakeRange(0, mutable.length)];
  [mutable replaceOccurrencesOfString:@"&#x27;"
                           withString:@"'"
                              options:NSLiteralSearch
                                range:NSMakeRange(0, mutable.length)];
  [mutable replaceOccurrencesOfString:@"&quot;"
                           withString:@"\""
                              options:NSLiteralSearch
                                range:NSMakeRange(0, mutable.length)];
  return mutable;
};

@end