How to get an array of sentences using CFStringTokenizer?

Question

I've created an string tokenizer like this:

stringTokenizer = CFStringTokenizerCreate(
                         NULL
                         , (CFStringRef)str
                         , CFRangeMake(0, [str length])
                         , kCFStringTokenizerUnitSentence
                         , userLocale);

But how do I obtain those sentences now from the tokenizer? The CF String Programming Guide doesn't mention CFStringTokenizer or tokens (did a full-text search in the PDF).

score 18 · Accepted Answer · edited Dec 03 '13 at 14:56

Here is an example of CFStringTokenizer usage:

CFStringRef string; // Get string from somewhere
CFLocaleRef locale = CFLocaleCopyCurrent();

CFStringTokenizerRef tokenizer = 
    CFStringTokenizerCreate(
        kCFAllocatorDefault
        , string
        , CFRangeMake(0, CFStringGetLength(string))
        , kCFStringTokenizerUnitSentence
        , locale);

CFStringTokenizerTokenType tokenType = kCFStringTokenizerTokenNone;
unsigned tokensFound = 0;

while(kCFStringTokenizerTokenNone !=
    (tokenType = CFStringTokenizerAdvanceToNextToken(tokenizer))) {
    CFRange tokenRange = CFStringTokenizerGetCurrentTokenRange(tokenizer);
    CFStringRef tokenValue =
        CFStringCreateWithSubstring(
            kCFAllocatorDefault
            , string
            , tokenRange);

  // Do something with the token
  CFShow(tokenValue);
  CFRelease(tokenValue);
  ++tokensFound;
}

// Clean up
CFRelease(tokenizer);
CFRelease(locale);

+1. It's also possible to do the same using the higher level `[NSString enumerateSubstringsInRange:options:usingBlock:]` with the option `NSStringEnumerationBySentences`, though the Foundation solution is a little more powerful. For example, you can specify any locale using `CFStringTokenizerCreate`, whereas `enumerateSubstringsInRange:options:usingBlock:` uses the current user locale. — David Snabel-Caunt, Sep 20 '13 at 18:13

score 0 · Answer 2 · answered Jun 19 '17 at 12:43

You may also use:

    [mutstri enumerateSubstringsInRange:NSMakeRange(0, [mutstri length])
                                options:NSStringEnumerationBySentences
                             usingBlock:^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop){

                                 NSLog(@"%@", substring);

                             }];

How to get an array of sentences using CFStringTokenizer?

2 Answers2

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