GTMNSString+URLArguments.m

//
//  GTMNSString+URLArguments.m
//
//  Copyright 2006-2008 Google 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, WITHOUT
//  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
//  License for the specific language governing permissions and limitations under
//  the License.
//

// MODIFIED by Keith Lazuka (klazuka@gmail.com) to remove the dependency on
// GTMGarbageCollection.h, which is not available on the iPhone.

#import "GTMNSString+URLArguments.h"

@implementation NSString (GTMNSStringURLArgumentsAdditions)

- (NSString*)gtm_stringByEscapingForURLArgument {
  // Encode all the reserved characters, per RFC 3986
  // (<http://www.ietf.org/rfc/rfc3986.txt>)
  NSString *escaped = 
    (NSString*)CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,
                                                       (CFStringRef)self,
                                                       NULL,
                                                       (CFStringRef)@"!*'();:@&=+$,/?%#[]",
                                                       kCFStringEncodingUTF8);
  return [escaped autorelease];
}

- (NSString*)gtm_stringByUnescapingFromURLArgument {
  NSMutableString *resultString = [NSMutableString stringWithString:self];
  [resultString replaceOccurrencesOfString:@"+"
                                withString:@" "
                                   options:NSLiteralSearch
                                     range:NSMakeRange(0, [resultString length])];
  return [resultString stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
}

@end