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POHow to adjust the variable scope in while loop for matching all regex in CoffeeScript?
 

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  1. POHow to adjust the variable scope in while loop for matching all regex in CoffeeScript?
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    <p>I'm having a little trouble with while loops in coffeescript.</p> <p>The original function is as the following and <a href="https://stackoverflow.com/a/8877261/751969">the source is this answer</a>: </p> <pre><code>// Return all pattern matches with captured groups RegExp.prototype.execAll = function(string) { var match = null; var matches = new Array(); while (match = this.exec(string)) { var matchArray = []; for (i in match) { if (parseInt(i) == i) { matchArray.push(match[i]); } } matches.push(matchArray); } return matches; } </code></pre> <p>It works as intended. I have converted it via <a href="http://js2coffee.org/" rel="nofollow noreferrer">js2coffee</a> and the coffee script is:</p> <pre><code># Return all pattern matches with captured groups RegExp::execAll = (string) -&gt; matches = new Array() match = null while match = @exec(string) matchArray = new Array() for i of match matchArray.push match[i] if parseInt(i) is i matches.push matchArray matches </code></pre> <p>Which compiles to:</p> <pre><code>RegExp.prototype.execAll = function(string) { var i, match, matchArray, matches; matches = new Array(); match = null; while (match = this.exec(string)) { matchArray = new Array(); for (i in match) { if (parseInt(i) === i) { matchArray.push(match[i]); } } matches.push(matchArray); } return matches; }; </code></pre> <p>The result is:</p> <pre><code>[ [], [], [], [], [], [], [], [], [] ] </code></pre> <p>I think this doesn't work because of the variable scope since the only difference I can see is this line:</p> <pre><code>RegExp.prototype.execAll = function(string) { var i, match, matchArray, matches; </code></pre> <p>versus the original:</p> <pre><code>RegExp.prototype.execAll = function(string) { var match = null; var matches = new Array(); while (match = this.exec(string)) { var matchArray = []; </code></pre> <p>Notice how <code>matchArray</code> is scoped out... I couldn't find a way around this, but as I was researching I found these questions <a href="https://stackoverflow.com/questions/6052946/were-do-while-loops-left-out-of-coffeescript">Were `do...while` loops left out of CoffeeScript...?</a> and <a href="https://stackoverflow.com/questions/8005505/how-do-i-declare-a-variable-in-a-specific-scope-in-coffeescript">How do I declare a variable in a specific scope in coffeescript?</a> and I'm pretty much out of ideas here... Any other way of matching all with regexp other than this while loop (by the way I have tried <code>\gm</code> flags and it still hits only one match)? Or is there a way of getting this scope right in coffee script?</p> <p>The whole Coffee Script code is :</p> <pre><code>fs = require 'fs' text = fs.readFileSync('test.md','utf8') #console.log text regex = /^(?:@@)(\w+):(.*.)/gm # Return all pattern matches with captured groups RegExp::execAll = (string) -&gt; matches = new Array() match = null while match = @exec(string) matchArray = new Array() for i of match matchArray.push match[i] if parseInt(i) is i matches.push matchArray matches res = regex.execAll text #console.log regex.exec text console.log (JSON.stringify(res, null, " ") ) </code></pre> <p>And the Javascript <strong>that works</strong> is this:</p> <pre><code>var fs, regex, res, text; fs = require('fs'); text = fs.readFileSync('test.md', 'utf8'); regex = /^(?:@@)(\w+):(.*.)/gm; // Return all pattern matches with captured groups RegExp.prototype.execAll = function(string) { var match = null; var matches = new Array(); while (match = this.exec(string)) { var matchArray = []; for (i in match) { if (parseInt(i) == i) { matchArray.push(match[i]); } } matches.push(matchArray); } return matches; } res = regex.execAll(text); //console.log(regex.exec(text)); console.log(JSON.stringify(res, null, " ")); </code></pre>
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