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//
// GTMNSString+XML.m
//
// Copyright 2007-2008 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.
//
#import "GTMNSString+XML.h"
#import "GTMGarbageCollection.h"
typedef enum {
kGMXMLCharModeEncodeQUOT = 0,
kGMXMLCharModeEncodeAMP = 1,
kGMXMLCharModeEncodeAPOS = 2,
kGMXMLCharModeEncodeLT = 3,
kGMXMLCharModeEncodeGT = 4,
kGMXMLCharModeValid = 99,
kGMXMLCharModeInvalid = 100,
} GMXMLCharMode;
static NSString *gXMLEntityList[] = {
// this must match the above order
@""",
@"&",
@"'",
@"<",
@">",
};
FOUNDATION_STATIC_INLINE GMXMLCharMode XMLModeForUnichar(UniChar c) {
// Per XML spec Section 2.2 Characters
// ( http://www.w3.org/TR/REC-xml/#charsets )
//
// Char ::= #x9 | #xA | #xD | [#x20-#xD7FF] | [#xE000-#xFFFD] |
// [#x10000-#x10FFFF]
if (c <= 0xd7ff) {
if (c >= 0x20) {
switch (c) {
case 34:
return kGMXMLCharModeEncodeQUOT;
case 38:
return kGMXMLCharModeEncodeAMP;
case 39:
return kGMXMLCharModeEncodeAPOS;
case 60:
return kGMXMLCharModeEncodeLT;
case 62:
return kGMXMLCharModeEncodeGT;
default:
return kGMXMLCharModeValid;
}
} else {
if (c == '\n')
return kGMXMLCharModeValid;
if (c == '\r')
return kGMXMLCharModeValid;
if (c == '\t')
return kGMXMLCharModeValid;
return kGMXMLCharModeInvalid;
}
}
if (c < 0xE000)
return kGMXMLCharModeInvalid;
if (c <= 0xFFFD)
return kGMXMLCharModeValid;
// UniChar can't have the following values
// if (c < 0x10000)
// return kGMXMLCharModeInvalid;
// if (c <= 0x10FFFF)
// return kGMXMLCharModeValid;
return kGMXMLCharModeInvalid;
} // XMLModeForUnichar
static NSString *AutoreleasedCloneForXML(NSString *src, BOOL escaping) {
//
// NOTE:
// We don't use CFXMLCreateStringByEscapingEntities because it's busted in
// 10.3 (http://lists.apple.com/archives/Cocoa-dev/2004/Nov/msg00059.html) and
// it doesn't do anything about the chars that are actually invalid per the
// xml spec.
//
// we can't use the CF call here because it leaves the invalid chars
// in the string.
NSMutableString *finalString = [NSMutableString string];
int length = [src length];
require_quiet(length != 0, cantConvertAnything);
// see if we can just use the interal version
BOOL freeBuffer = NO;
UniChar *buffer = (UniChar*)CFStringGetCharactersPtr((CFStringRef)src);
if (!buffer) {
// nope, alloc buffer and fetch the chars ourselves
buffer = malloc(sizeof(UniChar) * length);
require_action(buffer, cantCreateString, finalString = nil);
freeBuffer = YES;
[src getCharacters:buffer];
}
UniChar *goodRun = buffer;
int goodRunLength = 0;
for (int i = 0; i < length; ++i) {
GMXMLCharMode cMode = XMLModeForUnichar(buffer[i]);
// valid chars go as is, and if we aren't doing entities, then
// everything goes as is.
if ((cMode == kGMXMLCharModeValid) ||
(!escaping && (cMode != kGMXMLCharModeInvalid))) {
// goes as is
goodRunLength += 1;
} else {
// it's something we have to encode or something invalid
// start by adding what we already collected (if anything)
if (goodRunLength) {
CFStringRef goodRunString =
CFStringCreateWithCharactersNoCopy(kCFAllocatorDefault,
goodRun, goodRunLength,
kCFAllocatorNull);
require_action(goodRunString != NULL, cantCreateString, finalString = nil);
[finalString appendString:(NSString*)goodRunString];
CFRelease(goodRunString);
goodRunLength = 0;
}
// if it wasn't invalid, add the encoded version
if (cMode != kGMXMLCharModeInvalid) {
// add this encoded
[finalString appendString:gXMLEntityList[cMode]];
}
// update goodRun to point to the next UniChar
goodRun = buffer + i + 1;
}
}
// anything left to add?
if (goodRunLength) {
CFStringRef goodRunString =
CFStringCreateWithCharactersNoCopy(kCFAllocatorDefault,
goodRun, goodRunLength,
kCFAllocatorNull);
require_action(goodRunString != NULL, cantCreateString2, finalString = nil);
[finalString appendString:(NSString*)goodRunString];
CFRelease(goodRunString);
}
cantCreateString:
cantCreateString2:
if (freeBuffer)
free(buffer);
cantConvertAnything:
return finalString;
} // AutoreleasedCloneForXML
@implementation NSString (GTMNSStringXMLAdditions)
- (NSString *)gtm_stringBySanitizingAndEscapingForXML {
return AutoreleasedCloneForXML(self, YES);
} // gtm_stringBySanitizingAndEscapingForXML
- (NSString *)gtm_stringBySanitizingToXMLSpec {
return AutoreleasedCloneForXML(self, NO);
} // gtm_stringBySanitizingToXMLSpec
@end
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