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POCode golf: "Color highlighting" of repeated text
 

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  1. POCode golf: "Color highlighting" of repeated text
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    <p>(Thanks to greg0ire below for helping with key concepts)</p> <p>The challenge: Build a program that finds all substrings and "tags" them with color attributes (effectively highlighting them in XML). </p> <p>The rules:</p> <ol> <li>This should only be done for substrings of length 2 or more. </li> <li>Substrings are just strings of consecutive characters, which may include non-alphabetic characters. Note that spaces and other punctuation do not delimit substrings.</li> <li>Character casing cannot be ignored.</li> <li>The "highlight" should be done by tagging the substring in XML. Your tagging should be of the form <code>&lt;TAG#&gt;theSubstring&lt;/TAG#&gt;</code> where <code>#</code> is a positive number unique to that substring and identical substrings.</li> <li>The priority of the algorithm is to find the longest substring, not how many times it matches within the text.</li> </ol> <p>Note: The order of the tagging shown in the example below is not important. Its just used by the OP for clarity.</p> <hr> <p>An example input:</p> <pre><code>LoremIpsumissimplydummytextoftheprintingandtypesettingindustry.LoremIpsumhasbeentheindustry'sstandarddummytexteversincethe1500s,whenanunknownprintertookagalleyoftypeandscrambledittomakeatypespecimenbook. </code></pre> <hr> <p>A partially correct output (OP may NOT have completely replaced perfectly in this example)</p> <pre><code>&lt;TAG1&gt;LoremIpsum&lt;/TAG1&gt;issimply&lt;TAG2&gt;dummytext&lt;/TAG2&gt;of&lt;TAG5&gt;the&lt;/TAG5&gt;&lt;TAG3&gt;print&lt;/TAG3&gt;ingand&lt;TAG4&gt;type&lt;/TAG4&gt;setting&lt;TAG6&gt;industry&lt;/TAG6&gt;.&lt;TAG1&gt;LoremIpsum&lt;/TAG1&gt;hasbeen&lt;TAG5&gt;the&lt;/TAG5&gt;&lt;TAG6&gt;industry&lt;/TAG6&gt;'sstandard&lt;TAG2&gt;dummytext&lt;/TAG2&gt;eversince&lt;TAG5&gt;the&lt;/TAG5&gt;1500s,whenanunknown&lt;TAG3&gt;print&lt;/TAG3&gt;ertookagalleyof&lt;TAG4&gt;type&lt;/TAG4&gt;andscrambledittomakea&lt;TAG4&gt;type&lt;/TAG4&gt;specimenbook. </code></pre> <hr> <p>Your code should be able to handle edge cases, such as the following:</p> <p>Example Input 2:</p> <pre><code>hello!TAG!&lt;/hello.TAG.&lt;/ </code></pre> <p>Example Output 2:</p> <pre><code>&lt;TAG1&gt;hello&lt;/TAG1&gt;!&lt;TAG2&gt;TAG&lt;/TAG2&gt;!&lt;TAG3&gt;&lt;/&lt;/TAG3&gt;&lt;TAG1&gt;hello&lt;/TAG1&gt;.&lt;TAG2&gt;TAG&lt;/TAG2&gt;.&lt;TAG3&gt;&lt;/&lt;/TAG3&gt; </code></pre> <hr> <p>The winner:</p> <ul> <li>Most elegant solution wins (judged by others comments, upvotes) </li> <li>Bonus points/consideration for solutions utilizing shell scripting</li> </ul> <hr> <p>Minor clarifications:</p> <ul> <li>Input can be hard coded or read from a file</li> <li>The criteria remains "elegance", which admittedly IS slightly vague, but it also encapsulates simple character/line counts as well. Comments by others and/or upvotes are also indicative of how the SO community views the challenge</li> </ul>
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    1. USThomas Eding
    1. USRubiCon10
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      1. USChristopher McAtackney
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    1. CO+1 Very interesting question. Are you going to look for the largest repeated pieces of text, or for the most repeated pieces of text? How are you going to name a "piece of text" (to me, it is a group of consecutive words)? An "expression"?
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      1. USgreg0ire
    2. COHi greg - thanks for askiing... i actually need it for ANY string of bytes actually and the "largest" such string... :)
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      1. USRubiCon10
    3. COHi RubiCon10. If you accept answers in all languages you might want to add the tags language-agnostic and rosetta-stone. Also: most elegant solution is not really code-golfing in my definition ;-) –
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