root/trunk/source/NSStringICUAdditions.m

//
//  NSStringICUAdditions.m
//  CocoaICU
//
//  Created by Aaron Evans on 11/19/06.
//  Copyright 2006 Aaron Evans. All rights reserved.
//

#import "NSStringICUAdditions.h"
#import "ICUPattern.h"
#import "ICUMatcher.h"

struct URegularExpression;
/**
* Structure represeting a compiled regular rexpression, plus the results
 *    of a match operation.
 * @draft ICU 3.0
 */
typedef struct URegularExpression URegularExpression;

#define U_HIDE_DRAFT_API 1
#define U_DISABLE_RENAMING 1
#import <unicode/uregex.h>

@interface NSString (NSStringICUPrivateAdditions)

@end

@implementation NSString (NSStringICUAdditions)

-(NSString *)replaceOccurrencesOfPattern:(NSString *)aPattern withString:(NSString *)replacementText {
        ICUPattern *p = [ICUPattern patternWithString:aPattern];
        ICUMatcher *m = [ICUMatcher matcherWithPattern:p overString:self];
        return [m replaceAllWithString:replacementText];
}

-(BOOL)matchesPattern:(NSString *)aRegex {
        ICUPattern *p = [ICUPattern patternWithString:aRegex];
        ICUMatcher *m = [ICUMatcher matcherWithPattern:p overString:self];
        return [m matches];
}

-(NSArray *)findPattern:(NSString *)aRegex {
        ICUPattern *p = [ICUPattern patternWithString:aRegex];
        ICUMatcher *matcher = [ICUMatcher matcherWithPattern:p overString:self];
        NSMutableArray *foundGroups = [NSMutableArray array];
        
        [matcher findFromIndex:0];      
        int i;
        for(i=0;i<=[matcher numberOfGroups];i++)
                [foundGroups addObject:[matcher groupAtIndex:i]];

        return [NSArray arrayWithArray:foundGroups];
}

-(NSArray *)componentsSeparatedByPattern:(NSString *)aRegex {
        ICUPattern *p = [ICUPattern patternWithString:aRegex];
        return [p componentsSplitFromString:self];
}

+(NSString *)stringWithICUString:(void *)utf16EncodedString {
        return [[[NSString alloc] initWithBytes:utf16EncodedString 
                                                                         length:u_strlen(utf16EncodedString)*sizeof(UChar) 
                                                                   encoding:[self nativeUTF16Encoding]] autorelease];   
}

+(NSStringEncoding)nativeUTF16Encoding {
        CFStringEncoding stringEncoding;
#if __BIG_ENDIAN__
        stringEncoding = kCFStringEncodingUTF16BE;
#elif __LITTLE_ENDIAN__
        stringEncoding = kCFStringEncodingUTF16LE;
#endif

        return CFStringConvertEncodingToNSStringEncoding(stringEncoding);
}

-(void *)UTF16String {
        UChar *ret = (UChar *)[self cStringUsingEncoding:[NSString nativeUTF16Encoding]];
        
        // for some reason, the null-terminator doesn't always show up at the right place and this
        // causes extra characters to be created in the unicode string.  We remove them here by force.
        unsigned int len = [self length];
        ret[len] = '\0';
        return ret;     
}

-(void *)copyUTF16String {
        unsigned int length = [self length];
        UChar *utf16String = malloc((length+1)*sizeof(UChar));
        [self getCharacters: utf16String];
        utf16String[length] = 0;
        return utf16String;
}

@end