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POMultiple character set replacement algorithm
 

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  1. POMultiple character set replacement algorithm
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    <p>I have the need to replace a set of characters with a single character. Ok No problem. There are a slew of ways to go about this. Currently, I am implementing the following:</p> <pre><code>-(NSString *)spank:(NSString *)string { NSCharacterSet *buggers = [NSCharacterSet characterSetWithCharactersInString:BAD_CHARS]; return [[string componentsSeparatedByCharactersInSet:buggers] componentsJoinedByString:GOOD_CHAR]; } </code></pre> <hr> <p><strong><code>My problem is discovering other sets of characters that are in need of being replaced within that same string.</code></strong></p> <p>e.g.</p> <pre><code>#define BAD_CHARS @"`^" #define GOOD_CHAR @"|" #define TEST @"Lor*em` ipsum dolor ^sit amet" ... clean = [self spank:TEST]; </code></pre> <p>console log: clean = "Lor*em| ipsum dolor |sit amet"<br>But it would be nice to replace * with a different character. Other cases could be added later.</p> <hr> <p>To solve this, I could:</p> <ol> <li><p>Message spank repeatedly for the same string, granted I changed it's signature. (boring, repetitive, and inefficient)</p> <pre><code>-(NSString *)spank:(NSString *)string bad:(NSString *)badset good:(NSString *)good; </code></pre></li> <li><p>Use enumeration. (I have implemented this with success)</p> <pre><code>-(NSString *)spank:(NSString *)string { static NSDictionary *blackbook; if (!blackbook) blackbook = [NSDictionary dictionaryWithObjectsAndKeys: GOOD_CHAR_A, BAD_CHARS_A, GOOD_CHAR_B, BAD_CHARS_B, nil]; __block NSString *pure = string; [blackbook enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) { NSCharacterSet *buggers = [NSCharacterSet characterSetWithCharactersInString:key]; pure = [[pure componentsSeparatedByCharactersInSet:buggers] componentsJoinedByString:obj]; }]; return pure; } </code></pre></li> <li><p>Implement a coder from NSCoder. This is an area I haven't explored yet.</p></li> <li><p>Use php. I have the option to purge the string with php before I return it to the client. Perhaps it would be done easier there. Thoughts?</p></li> <li><p>Some other cleaner, easier way I haven't come up with yet but maybe you have.</p></li> </ol> <p>Thanks in advance for any suggestions. I do have this working with solution #2. Just not as concise as I would like to see.</p>
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    1. COWouldn't a regular expression (NSRegularExpression) be a good fit here? http://stackoverflow.com/questions/9276246/how-to-write-regular-expressions-in-objective-c-nsregularexpression
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    2. COKeep in mind I need to perform different actions based on the matched string. But this is worth looking at closer.
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    3. COI think you're looking for a Regex "Replace with callback" situation. Check this out: http://stackoverflow.com/questions/3957092/is-there-an-objective-c-regex-replace-with-callback-c-matchevaluator-equivalent
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