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/*
Copyright (C) 2000-2005 SKYRIX Software AG
This file is part of SOPE.
SOPE is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version.
SOPE 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 Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public
License along with SOPE; see the file COPYING. If not, write to the
Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA.
*/
#include <NGObjWeb/NSString+JavaScriptEscaping.h>
#include "common.h"
@implementation NSString(JavascriptEscaping)
static inline unichar HEX_NIBBLE(unichar v) {
return (v > 9) ? (v - 10 + 'a') : (v + '0');
}
- (NSString *)stringByApplyingJavaScriptEscaping {
/* Replaces \b, \f, \n, \r, \t, ', " by \-escaped sequences.
Replaces non-ASCII characters by either \xXX escape sequences,
when character is in ISOLatin1, or \uXXXX escape sequences.
Result string can be used safely as a Javascript string value.
*/
NSString *javascriptEscapedString = self;
unsigned additionalCharCount = 0;
unsigned length = [self length];
int i, firstEscapedCharIndex = -1, lastEscapedCharIndex = length;
for(i = length - 1; i >= 0; i -=1) {
unichar aChar = [self characterAtIndex:i];
if (aChar > 255) {
additionalCharCount += 5; // \uXXXX
firstEscapedCharIndex = i;
}
else if (aChar > 127) {
additionalCharCount += 3; // \xXX
firstEscapedCharIndex = i;
}
else if (aChar == '\b' || aChar == '\f' || aChar == '\n' ||
aChar == '\r' ||
aChar == '\t' || aChar == '\'' || aChar == '"' || aChar == '\\') {
additionalCharCount += 1;
firstEscapedCharIndex = i;
}
if (lastEscapedCharIndex == length && additionalCharCount != 0)
lastEscapedCharIndex = i;
}
if (additionalCharCount > 0) {
unsigned newLength = length + additionalCharCount;
unichar *newChars = NSZoneMalloc(NSDefaultMallocZone(),
sizeof(unichar) * newLength);
unsigned offset = 0;
[self getCharacters:newChars range:NSMakeRange(0, firstEscapedCharIndex)];
for(i = firstEscapedCharIndex; i <= lastEscapedCharIndex; i += 1) {
unichar aChar = [self characterAtIndex:i];
if (aChar > 255) {
newChars[i + offset] = '\\';
newChars[i + offset + 1] = 'u';
newChars[i + offset + 2] = HEX_NIBBLE((aChar >> 12) & 0x0F);
newChars[i + offset + 3] = HEX_NIBBLE((aChar >> 8) & 0x0F);
newChars[i + offset + 4] = HEX_NIBBLE((aChar >> 4) & 0x0F);
newChars[i + offset + 5] = HEX_NIBBLE( aChar & 0x0F);
offset += 5;
}
else if (aChar > 127) {
newChars[i + offset] = '\\';
newChars[i + offset + 1] = 'x';
newChars[i + offset + 2] = HEX_NIBBLE((aChar >> 4) & 0x0F);
newChars[i + offset + 3] = HEX_NIBBLE( aChar & 0x0F);
offset += 3;
}
else if (aChar == '\b') {
newChars[i + offset] = '\\';
newChars[i + offset + 1] = 'b';
offset += 1;
}
else if (aChar == '\f') {
newChars[i + offset] = '\\';
newChars[i + offset + 1] = 'f';
offset += 1;
}
else if (aChar == '\n') {
newChars[i + offset] = '\\';
newChars[i + offset + 1] = 'n';
offset += 1;
}
else if (aChar == '\r') {
newChars[i + offset] = '\\';
newChars[i + offset + 1] = 'r';
offset += 1;
}
else if (aChar == '\t') {
newChars[i + offset] = '\\';
newChars[i + offset + 1] = 't';
offset += 1;
}
else if (aChar == '\'') {
newChars[i + offset] = '\\';
newChars[i + offset + 1] = '\'';
offset += 1;
}
else if (aChar == '"') {
newChars[i + offset] = '\\';
newChars[i + offset + 1] = '"';
offset += 1;
}
else if (aChar == '\\') {
newChars[i + offset] = '\\';
newChars[i + offset + 1] = '\\';
offset += 1;
}
else
newChars[i + offset] = aChar;
}
if (lastEscapedCharIndex < length)
[self getCharacters:(newChars + offset + lastEscapedCharIndex + 1)
range:NSMakeRange(lastEscapedCharIndex + 1,
length - lastEscapedCharIndex - 1)];
javascriptEscapedString = [NSString stringWithCharacters:newChars
length:newLength];
}
return javascriptEscapedString;
}
@end /* NSString(JavascriptEscaping) */
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