628 lines
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HTML
628 lines
28 KiB
HTML
<!DOCTYPE html>
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<li id="title">
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<div class="annotation">
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<h1>helpers.coffee</h1>
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</div>
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</li>
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<li id="section-1">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-1">¶</a>
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</div>
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<p>This file contains the common helper functions that we’d like to share among
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the <strong>Lexer</strong>, <strong>Rewriter</strong>, and the <strong>Nodes</strong>. Merge objects, flatten
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arrays, count characters, that sort of thing.</p>
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</div>
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</li>
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<li id="section-2">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-2">¶</a>
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</div>
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<p>Peek at the beginning of a given string to see if it matches a sequence.</p>
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</div>
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<div class="content"><div class='highlight'><pre><span class="hljs-built_in">exports</span>.<span class="hljs-function"><span class="hljs-title">starts</span> = <span class="hljs-params">(string, literal, start)</span> -></span>
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literal <span class="hljs-keyword">is</span> string.substr start, literal.length</pre></div></div>
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</li>
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<li id="section-3">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-3">¶</a>
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</div>
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<p>Peek at the end of a given string to see if it matches a sequence.</p>
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</div>
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<div class="content"><div class='highlight'><pre><span class="hljs-built_in">exports</span>.<span class="hljs-function"><span class="hljs-title">ends</span> = <span class="hljs-params">(string, literal, back)</span> -></span>
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len = literal.length
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literal <span class="hljs-keyword">is</span> string.substr string.length - len - (back <span class="hljs-keyword">or</span> <span class="hljs-number">0</span>), len</pre></div></div>
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</li>
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<li id="section-4">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-4">¶</a>
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</div>
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<p>Repeat a string <code>n</code> times.</p>
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</div>
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<div class="content"><div class='highlight'><pre><span class="hljs-built_in">exports</span>.repeat = <span class="hljs-function"><span class="hljs-title">repeat</span> = <span class="hljs-params">(str, n)</span> -></span></pre></div></div>
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</li>
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<li id="section-5">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-5">¶</a>
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</div>
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<p>Use clever algorithm to have O(log(n)) string concatenation operations.</p>
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</div>
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<div class="content"><div class='highlight'><pre> res = <span class="hljs-string">''</span>
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<span class="hljs-keyword">while</span> n > <span class="hljs-number">0</span>
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res += str <span class="hljs-keyword">if</span> n & <span class="hljs-number">1</span>
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n >>>= <span class="hljs-number">1</span>
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str += str
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res</pre></div></div>
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</li>
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<li id="section-6">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-6">¶</a>
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</div>
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<p>Trim out all falsy values from an array.</p>
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</div>
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<div class="content"><div class='highlight'><pre><span class="hljs-built_in">exports</span>.<span class="hljs-function"><span class="hljs-title">compact</span> = <span class="hljs-params">(array)</span> -></span>
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item <span class="hljs-keyword">for</span> item <span class="hljs-keyword">in</span> array <span class="hljs-keyword">when</span> item</pre></div></div>
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</li>
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<li id="section-7">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-7">¶</a>
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</div>
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<p>Count the number of occurrences of a string in a string.</p>
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</div>
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<div class="content"><div class='highlight'><pre><span class="hljs-built_in">exports</span>.<span class="hljs-function"><span class="hljs-title">count</span> = <span class="hljs-params">(string, substr)</span> -></span>
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num = pos = <span class="hljs-number">0</span>
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<span class="hljs-keyword">return</span> <span class="hljs-number">1</span>/<span class="hljs-number">0</span> <span class="hljs-keyword">unless</span> substr.length
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num++ <span class="hljs-keyword">while</span> pos = <span class="hljs-number">1</span> + string.indexOf substr, pos
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num</pre></div></div>
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</li>
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<li id="section-8">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-8">¶</a>
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</div>
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<p>Merge objects, returning a fresh copy with attributes from both sides.
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Used every time <code>Base#compile</code> is called, to allow properties in the
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options hash to propagate down the tree without polluting other branches.</p>
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</div>
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<div class="content"><div class='highlight'><pre><span class="hljs-built_in">exports</span>.<span class="hljs-function"><span class="hljs-title">merge</span> = <span class="hljs-params">(options, overrides)</span> -></span>
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extend (extend {}, options), overrides</pre></div></div>
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</li>
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<li id="section-9">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-9">¶</a>
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</div>
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<p>Extend a source object with the properties of another object (shallow copy).</p>
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</div>
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<div class="content"><div class='highlight'><pre>extend = <span class="hljs-built_in">exports</span>.<span class="hljs-function"><span class="hljs-title">extend</span> = <span class="hljs-params">(object, properties)</span> -></span>
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<span class="hljs-keyword">for</span> key, val <span class="hljs-keyword">of</span> properties
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object[key] = val
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object</pre></div></div>
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</li>
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<li id="section-10">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-10">¶</a>
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</div>
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<p>Return a flattened version of an array.
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Handy for getting a list of <code>children</code> from the nodes.</p>
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</div>
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<div class="content"><div class='highlight'><pre><span class="hljs-built_in">exports</span>.flatten = <span class="hljs-function"><span class="hljs-title">flatten</span> = <span class="hljs-params">(array)</span> -></span>
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flattened = []
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<span class="hljs-keyword">for</span> element <span class="hljs-keyword">in</span> array
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<span class="hljs-keyword">if</span> element <span class="hljs-keyword">instanceof</span> Array
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flattened = flattened.concat flatten element
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<span class="hljs-keyword">else</span>
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flattened.push element
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flattened</pre></div></div>
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</li>
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<li id="section-11">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-11">¶</a>
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</div>
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<p>Delete a key from an object, returning the value. Useful when a node is
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looking for a particular method in an options hash.</p>
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</div>
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<div class="content"><div class='highlight'><pre><span class="hljs-built_in">exports</span>.<span class="hljs-function"><span class="hljs-title">del</span> = <span class="hljs-params">(obj, key)</span> -></span>
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val = obj[key]
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<span class="hljs-keyword">delete</span> obj[key]
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val</pre></div></div>
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</li>
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<li id="section-12">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-12">¶</a>
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</div>
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<p>Gets the last item of an array(-like) object.</p>
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</div>
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<div class="content"><div class='highlight'><pre><span class="hljs-built_in">exports</span>.last = <span class="hljs-function"><span class="hljs-title">last</span> = <span class="hljs-params">(array, back)</span> -></span> array[array.length - (back <span class="hljs-keyword">or</span> <span class="hljs-number">0</span>) - <span class="hljs-number">1</span>]</pre></div></div>
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</li>
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<li id="section-13">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-13">¶</a>
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</div>
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<p>Typical Array::some</p>
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</div>
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<div class="content"><div class='highlight'><pre><span class="hljs-built_in">exports</span>.some = <span class="hljs-attribute">Array</span>::some ? <span class="hljs-function"><span class="hljs-params">(fn)</span> -></span>
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<span class="hljs-keyword">return</span> <span class="hljs-literal">true</span> <span class="hljs-keyword">for</span> e <span class="hljs-keyword">in</span> <span class="hljs-keyword">this</span> <span class="hljs-keyword">when</span> fn e
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<span class="hljs-literal">false</span></pre></div></div>
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</li>
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<li id="section-14">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-14">¶</a>
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</div>
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<p>Simple function for inverting Literate CoffeeScript code by putting the
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documentation in comments, producing a string of CoffeeScript code that
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can be compiled “normally”.</p>
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</div>
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<div class="content"><div class='highlight'><pre><span class="hljs-built_in">exports</span>.<span class="hljs-function"><span class="hljs-title">invertLiterate</span> = <span class="hljs-params">(code)</span> -></span>
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maybe_code = <span class="hljs-literal">true</span>
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lines = <span class="hljs-keyword">for</span> line <span class="hljs-keyword">in</span> code.split(<span class="hljs-string">'\n'</span>)
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<span class="hljs-keyword">if</span> maybe_code <span class="hljs-keyword">and</span> <span class="hljs-regexp">/^([ ]{4}|[ ]{0,3}\t)/</span>.test line
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line
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<span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> maybe_code = <span class="hljs-regexp">/^\s*$/</span>.test line
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line
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<span class="hljs-keyword">else</span>
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<span class="hljs-string">'# '</span> + line
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lines.join <span class="hljs-string">'\n'</span></pre></div></div>
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</li>
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<li id="section-15">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-15">¶</a>
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</div>
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<p>Merge two jison-style location data objects together.
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If <code>last</code> is not provided, this will simply return <code>first</code>.</p>
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</div>
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<div class="content"><div class='highlight'><pre><span class="hljs-function"><span class="hljs-title">buildLocationData</span> = <span class="hljs-params">(first, last)</span> -></span>
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<span class="hljs-keyword">if</span> <span class="hljs-keyword">not</span> last
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first
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<span class="hljs-keyword">else</span>
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<span class="hljs-attribute">first_line</span>: first.first_line
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<span class="hljs-attribute">first_column</span>: first.first_column
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<span class="hljs-attribute">last_line</span>: last.last_line
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<span class="hljs-attribute">last_column</span>: last.last_column</pre></div></div>
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</li>
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<li id="section-16">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-16">¶</a>
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</div>
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<p>This returns a function which takes an object as a parameter, and if that
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object is an AST node, updates that object’s locationData.
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The object is returned either way.</p>
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</div>
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<div class="content"><div class='highlight'><pre><span class="hljs-built_in">exports</span>.<span class="hljs-function"><span class="hljs-title">addLocationDataFn</span> = <span class="hljs-params">(first, last)</span> -></span>
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<span class="hljs-function"><span class="hljs-params">(obj)</span> -></span>
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<span class="hljs-keyword">if</span> ((<span class="hljs-keyword">typeof</span> obj) <span class="hljs-keyword">is</span> <span class="hljs-string">'object'</span>) <span class="hljs-keyword">and</span> (!!obj[<span class="hljs-string">'updateLocationDataIfMissing'</span>])
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obj.updateLocationDataIfMissing buildLocationData(first, last)
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<span class="hljs-keyword">return</span> obj</pre></div></div>
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</li>
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<li id="section-17">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-17">¶</a>
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</div>
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<p>Convert jison location data to a string.
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<code>obj</code> can be a token, or a locationData.</p>
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</div>
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<div class="content"><div class='highlight'><pre><span class="hljs-built_in">exports</span>.<span class="hljs-function"><span class="hljs-title">locationDataToString</span> = <span class="hljs-params">(obj)</span> -></span>
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<span class="hljs-keyword">if</span> (<span class="hljs-string">"2"</span> <span class="hljs-keyword">of</span> obj) <span class="hljs-keyword">and</span> (<span class="hljs-string">"first_line"</span> <span class="hljs-keyword">of</span> obj[<span class="hljs-number">2</span>]) <span class="hljs-keyword">then</span> locationData = obj[<span class="hljs-number">2</span>]
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<span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> <span class="hljs-string">"first_line"</span> <span class="hljs-keyword">of</span> obj <span class="hljs-keyword">then</span> locationData = obj
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<span class="hljs-keyword">if</span> locationData
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<span class="hljs-string">"<span class="hljs-subst">#{locationData.first_line + <span class="hljs-number">1</span>}</span>:<span class="hljs-subst">#{locationData.first_column + <span class="hljs-number">1</span>}</span>-"</span> +
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<span class="hljs-string">"<span class="hljs-subst">#{locationData.last_line + <span class="hljs-number">1</span>}</span>:<span class="hljs-subst">#{locationData.last_column + <span class="hljs-number">1</span>}</span>"</span>
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<span class="hljs-keyword">else</span>
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<span class="hljs-string">"No location data"</span></pre></div></div>
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</li>
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<li id="section-18">
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<div class="annotation">
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||
<div class="pilwrap ">
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<a class="pilcrow" href="#section-18">¶</a>
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</div>
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<p>A <code>.coffee.md</code> compatible version of <code>basename</code>, that returns the file sans-extension.</p>
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</div>
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<div class="content"><div class='highlight'><pre><span class="hljs-built_in">exports</span>.<span class="hljs-function"><span class="hljs-title">baseFileName</span> = <span class="hljs-params">(file, stripExt = <span class="hljs-literal">no</span>, useWinPathSep = <span class="hljs-literal">no</span>)</span> -></span>
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pathSep = <span class="hljs-keyword">if</span> useWinPathSep <span class="hljs-keyword">then</span> <span class="hljs-regexp">/\\|\//</span> <span class="hljs-keyword">else</span> <span class="hljs-regexp">/\/</span>/
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parts = file.split(pathSep)
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file = parts[parts.length - <span class="hljs-number">1</span>]
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<span class="hljs-keyword">return</span> file <span class="hljs-keyword">unless</span> stripExt <span class="hljs-keyword">and</span> file.indexOf(<span class="hljs-string">'.'</span>) >= <span class="hljs-number">0</span>
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parts = file.split(<span class="hljs-string">'.'</span>)
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parts.pop()
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parts.pop() <span class="hljs-keyword">if</span> parts[parts.length - <span class="hljs-number">1</span>] <span class="hljs-keyword">is</span> <span class="hljs-string">'coffee'</span> <span class="hljs-keyword">and</span> parts.length > <span class="hljs-number">1</span>
|
||
parts.join(<span class="hljs-string">'.'</span>)</pre></div></div>
|
||
|
||
</li>
|
||
|
||
|
||
<li id="section-19">
|
||
<div class="annotation">
|
||
|
||
<div class="pilwrap ">
|
||
<a class="pilcrow" href="#section-19">¶</a>
|
||
</div>
|
||
<p>Determine if a filename represents a CoffeeScript file.</p>
|
||
|
||
</div>
|
||
|
||
<div class="content"><div class='highlight'><pre><span class="hljs-built_in">exports</span>.<span class="hljs-function"><span class="hljs-title">isCoffee</span> = <span class="hljs-params">(file)</span> -></span> <span class="hljs-regexp">/\.((lit)?coffee|coffee\.md)$/</span>.test file</pre></div></div>
|
||
|
||
</li>
|
||
|
||
|
||
<li id="section-20">
|
||
<div class="annotation">
|
||
|
||
<div class="pilwrap ">
|
||
<a class="pilcrow" href="#section-20">¶</a>
|
||
</div>
|
||
<p>Determine if a filename represents a Literate CoffeeScript file.</p>
|
||
|
||
</div>
|
||
|
||
<div class="content"><div class='highlight'><pre><span class="hljs-built_in">exports</span>.<span class="hljs-function"><span class="hljs-title">isLiterate</span> = <span class="hljs-params">(file)</span> -></span> <span class="hljs-regexp">/\.(litcoffee|coffee\.md)$/</span>.test file</pre></div></div>
|
||
|
||
</li>
|
||
|
||
|
||
<li id="section-21">
|
||
<div class="annotation">
|
||
|
||
<div class="pilwrap ">
|
||
<a class="pilcrow" href="#section-21">¶</a>
|
||
</div>
|
||
<p>Throws a SyntaxError from a given location.
|
||
The error’s <code>toString</code> will return an error message following the “standard”
|
||
format <filename>:<line>:<col>: <message> plus the line with the error and a
|
||
marker showing where the error is.</p>
|
||
|
||
</div>
|
||
|
||
<div class="content"><div class='highlight'><pre><span class="hljs-built_in">exports</span>.<span class="hljs-function"><span class="hljs-title">throwSyntaxError</span> = <span class="hljs-params">(message, location)</span> -></span>
|
||
error = <span class="hljs-keyword">new</span> SyntaxError message
|
||
error.location = location
|
||
error.toString = syntaxErrorToString</pre></div></div>
|
||
|
||
</li>
|
||
|
||
|
||
<li id="section-22">
|
||
<div class="annotation">
|
||
|
||
<div class="pilwrap ">
|
||
<a class="pilcrow" href="#section-22">¶</a>
|
||
</div>
|
||
<p>Instead of showing the compiler’s stacktrace, show our custom error message
|
||
(this is useful when the error bubbles up in Node.js applications that
|
||
compile CoffeeScript for example).</p>
|
||
|
||
</div>
|
||
|
||
<div class="content"><div class='highlight'><pre> error.stack = error.toString()
|
||
|
||
<span class="hljs-keyword">throw</span> error</pre></div></div>
|
||
|
||
</li>
|
||
|
||
|
||
<li id="section-23">
|
||
<div class="annotation">
|
||
|
||
<div class="pilwrap ">
|
||
<a class="pilcrow" href="#section-23">¶</a>
|
||
</div>
|
||
<p>Update a compiler SyntaxError with source code information if it didn’t have
|
||
it already.</p>
|
||
|
||
</div>
|
||
|
||
<div class="content"><div class='highlight'><pre><span class="hljs-built_in">exports</span>.<span class="hljs-function"><span class="hljs-title">updateSyntaxError</span> = <span class="hljs-params">(error, code, filename)</span> -></span></pre></div></div>
|
||
|
||
</li>
|
||
|
||
|
||
<li id="section-24">
|
||
<div class="annotation">
|
||
|
||
<div class="pilwrap ">
|
||
<a class="pilcrow" href="#section-24">¶</a>
|
||
</div>
|
||
<p>Avoid screwing up the <code>stack</code> property of other errors (i.e. possible bugs).</p>
|
||
|
||
</div>
|
||
|
||
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">if</span> error.toString <span class="hljs-keyword">is</span> syntaxErrorToString
|
||
error.code <span class="hljs-keyword">or</span>= code
|
||
error.filename <span class="hljs-keyword">or</span>= filename
|
||
error.stack = error.toString()
|
||
error
|
||
|
||
<span class="hljs-function"><span class="hljs-title">syntaxErrorToString</span> = -></span>
|
||
<span class="hljs-keyword">return</span> <span class="hljs-attribute">Error</span>::toString.call @ <span class="hljs-keyword">unless</span> <span class="hljs-property">@code</span> <span class="hljs-keyword">and</span> <span class="hljs-property">@location</span>
|
||
|
||
{first_line, first_column, last_line, last_column} = <span class="hljs-property">@location</span>
|
||
last_line ?= first_line
|
||
last_column ?= first_column
|
||
|
||
filename = <span class="hljs-property">@filename</span> <span class="hljs-keyword">or</span> <span class="hljs-string">'[stdin]'</span>
|
||
codeLine = <span class="hljs-property">@code</span>.split(<span class="hljs-string">'\n'</span>)[first_line]
|
||
start = first_column</pre></div></div>
|
||
|
||
</li>
|
||
|
||
|
||
<li id="section-25">
|
||
<div class="annotation">
|
||
|
||
<div class="pilwrap ">
|
||
<a class="pilcrow" href="#section-25">¶</a>
|
||
</div>
|
||
<p>Show only the first line on multi-line errors.</p>
|
||
|
||
</div>
|
||
|
||
<div class="content"><div class='highlight'><pre> end = <span class="hljs-keyword">if</span> first_line <span class="hljs-keyword">is</span> last_line <span class="hljs-keyword">then</span> last_column + <span class="hljs-number">1</span> <span class="hljs-keyword">else</span> codeLine.length
|
||
marker = codeLine[...start].replace(<span class="hljs-regexp">/[^\s]/g</span>, <span class="hljs-string">' '</span>) + repeat(<span class="hljs-string">'^'</span>, end - start)</pre></div></div>
|
||
|
||
</li>
|
||
|
||
|
||
<li id="section-26">
|
||
<div class="annotation">
|
||
|
||
<div class="pilwrap ">
|
||
<a class="pilcrow" href="#section-26">¶</a>
|
||
</div>
|
||
<p>Check to see if we’re running on a color-enabled TTY.</p>
|
||
|
||
</div>
|
||
|
||
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">if</span> process?
|
||
colorsEnabled = process.stdout.isTTY <span class="hljs-keyword">and</span> <span class="hljs-keyword">not</span> process.env.NODE_DISABLE_COLORS
|
||
|
||
<span class="hljs-keyword">if</span> <span class="hljs-property">@colorful</span> ? colorsEnabled
|
||
<span class="hljs-function"><span class="hljs-title">colorize</span> = <span class="hljs-params">(str)</span> -></span> <span class="hljs-string">"\x1B[1;31m<span class="hljs-subst">#{str}</span>\x1B[0m"</span>
|
||
codeLine = codeLine[...start] + colorize(codeLine[start...end]) + codeLine[end..]
|
||
marker = colorize marker
|
||
|
||
<span class="hljs-string">"""
|
||
<span class="hljs-subst">#{filename}</span>:<span class="hljs-subst">#{first_line + <span class="hljs-number">1</span>}</span>:<span class="hljs-subst">#{first_column + <span class="hljs-number">1</span>}</span>: error: <span class="hljs-subst">#{<span class="hljs-property">@message</span>}</span>
|
||
<span class="hljs-subst">#{codeLine}</span>
|
||
<span class="hljs-subst">#{marker}</span>
|
||
"""</span>
|
||
|
||
<span class="hljs-built_in">exports</span>.<span class="hljs-function"><span class="hljs-title">nameWhitespaceCharacter</span> = <span class="hljs-params">(string)</span> -></span>
|
||
<span class="hljs-keyword">switch</span> string
|
||
<span class="hljs-keyword">when</span> <span class="hljs-string">' '</span> <span class="hljs-keyword">then</span> <span class="hljs-string">'space'</span>
|
||
<span class="hljs-keyword">when</span> <span class="hljs-string">'\n'</span> <span class="hljs-keyword">then</span> <span class="hljs-string">'newline'</span>
|
||
<span class="hljs-keyword">when</span> <span class="hljs-string">'\r'</span> <span class="hljs-keyword">then</span> <span class="hljs-string">'carriage return'</span>
|
||
<span class="hljs-keyword">when</span> <span class="hljs-string">'\t'</span> <span class="hljs-keyword">then</span> <span class="hljs-string">'tab'</span>
|
||
<span class="hljs-keyword">else</span> string</pre></div></div>
|
||
|
||
</li>
|
||
|
||
</ul>
|
||
</div>
|
||
</body>
|
||
</html>
|