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November 26, 2010 15:12
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/* | |
This code has been derived from the RegexKit project. | |
Copyright © 2007-2008, John Engelhart | |
All rights reserved. | |
Redistribution and use in source and binary forms, with or without | |
modification, are permitted provided that the following conditions are met: | |
* Redistributions of source code must retain the above copyright | |
notice, this list of conditions and the following disclaimer. | |
* 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. | |
* Neither the name of the Zang Industries nor the names of its | |
contributors may be used to endorse or promote products derived from | |
this software without specific prior written permission. | |
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
"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 COPYRIGHT | |
OWNER OR CONTRIBUTORS 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-utf8-range-conv.h" | |
static const unsigned char utf8ExtraBytes[] = { | |
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, | |
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, | |
2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, | |
3,3,3,3,3,3,3,3,4,4,4,4,5,5,5,5 }; | |
static const unsigned char utf8ExtraUTF16Characters[] = { | |
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, | |
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, | |
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, | |
1,1,1,1,1,1,1,1,1,1,1,1,2,2,2,2 }; | |
@implementation NSString (UTF8_range_conversion) | |
+ (NSRange)UTF16RangeFromUTF8Range:(NSRange)utf8range | |
inUTF8String:(const char *)utf8pch | |
ofLength:(size_t)utf8len { | |
assert(utf8pch != NULL); | |
if (utf8range.location == NSNotFound) return utf8range; | |
assert(utf8range.location < utf8len); | |
assert(NSMaxRange(utf8range) <= utf8len); | |
NSUInteger utf16len = 0; | |
NSRange utf16range = NSMakeRange(NSNotFound, 0); | |
const char *p = utf8pch; | |
while ((NSUInteger)(p - utf8pch) < NSMaxRange(utf8range)) { | |
if ((NSUInteger)(p - utf8pch) == utf8range.location) { | |
utf16range.location = utf16len; | |
} | |
const unsigned char c = *p; | |
p++; | |
utf16len++; | |
if (c < 128) continue; | |
const unsigned char idx = c & 0x3f; | |
p += utf8ExtraBytes[idx]; | |
utf16len += utf8ExtraUTF16Characters[idx]; | |
} | |
if ((NSUInteger)(p - utf8pch) == utf8range.location) | |
utf16range.location = utf16len; | |
utf16range.length = utf16len - utf16range.location; | |
return utf16range; | |
} | |
@end |
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// matchedUTF8Range is an NSRange struct representing a UTF-8 range | |
// utf8bytes is a pointer to the UTF-8 byte buffer | |
// utf8length is the total length of utf8bytes | |
// isMultibyte is a boolean indic | |
NSRange matchedUTF16Range; | |
if (u16str.length != utf8length) { | |
matchedUTF16Range = [NSString UTF16RangeFromUTF8Range:matchedUTF8Range | |
inUTF8String:utf8bytes | |
ofLength:utf8length]; | |
} else { | |
matchedUTF16Range = matchedUTF8Range; | |
} | |
// apply text attributes in the original UTF-16 string in matchedUTF16Range |
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