mirror of
https://github.com/jashkenas/coffeescript.git
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288 lines
10 KiB
HTML
288 lines
10 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<title>browser.coffee</title>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<meta name="viewport" content="width=device-width, target-densitydpi=160dpi, initial-scale=1.0; maximum-scale=1.0; user-scalable=0;">
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<link rel="stylesheet" media="all" href="docco.css" />
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<body>
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<div id="container">
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<div id="background"></div>
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<ul id="jump_to">
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<a class="large" href="javascript:void(0);">Jump To …</a>
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<a class="source" href="browser.html">
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browser.coffee
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</a>
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<a class="source" href="cake.html">
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cake.coffee
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</a>
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coffee-script.coffee
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command.coffee
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</a>
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grammar.coffee
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helpers.coffee
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index.coffee
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lexer.coffee
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nodes.coffee
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</a>
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optparse.coffee
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</a>
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repl.coffee
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</a>
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rewriter.coffee
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</a>
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<a class="source" href="scope.html">
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scope.litcoffee
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</a>
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<a class="source" href="sourcemap.html">
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sourcemap.coffee
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</a>
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</div>
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</li>
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</ul>
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<ul class="sections">
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<li id="title">
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<div class="annotation">
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<h1>browser.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 <strong>Browser</strong> compatibility layer extends core CoffeeScript functions
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to make things work smoothly when compiling code directly in the browser.
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We add support for loading remote Coffee scripts via <strong>XHR</strong>, and
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<code>text/coffeescript</code> script tags, source maps via data-URLs, and so on.
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</p>
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</div>
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<div class="content"><div class='highlight'><pre>CoffeeScript = require <span class="string">'./coffee-script'</span>
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CoffeeScript.require = require
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compile = CoffeeScript.compile</pre></div></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>Use standard JavaScript <code>eval</code> to eval code.
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</p>
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</div>
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<div class="content"><div class='highlight'><pre>CoffeeScript.<span class="function"><span class="title">eval</span></span> = (code, options = {}) ->
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options.bare ?= <span class="literal">on</span>
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eval compile code, options</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>Running code does not provide access to this scope.
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</p>
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</div>
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<div class="content"><div class='highlight'><pre>CoffeeScript.<span class="function"><span class="title">run</span></span> = (code, options = {}) ->
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options.bare = <span class="literal">on</span>
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Function(compile code, options)()</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>If we're not in a browser environment, we're finished with the public API.
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</p>
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</div>
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<div class="content"><div class='highlight'><pre><span class="keyword">return</span> <span class="keyword">unless</span> window?</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>Include source maps where possible. If we've got a base64 encoder, and a
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JSON serializer, we're good to go.
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</p>
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</div>
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<div class="content"><div class='highlight'><pre><span class="keyword">if</span> btoa? <span class="keyword">and</span> JSON?
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<span class="function"><span class="title">compile</span></span> = (code, options = {}) ->
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options.sourceMap = <span class="literal">true</span>
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options.inline = <span class="literal">true</span>
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{js, v3SourceMap} = CoffeeScript.compile code, options
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<span class="string">"<span class="subst">#{js}</span>\n//@ sourceMappingURL=data:application/json;base64,<span class="subst">#{btoa v3SourceMap}</span>\n//@ sourceURL=coffeescript"</span></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>Load a remote script from the current domain via XHR.
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</p>
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</div>
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<div class="content"><div class='highlight'><pre>CoffeeScript.<span class="function"><span class="title">load</span></span> = (url, callback, options = {}) ->
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options.sourceFiles = [url]
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xhr = <span class="keyword">if</span> window.ActiveXObject
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<span class="keyword">new</span> window.ActiveXObject(<span class="string">'Microsoft.XMLHTTP'</span>)
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<span class="keyword">else</span>
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<span class="keyword">new</span> XMLHttpRequest()
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xhr.open <span class="string">'GET'</span>, url, <span class="literal">true</span>
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xhr.overrideMimeType <span class="string">'text/plain'</span> <span class="keyword">if</span> <span class="string">'overrideMimeType'</span> <span class="keyword">of</span> xhr
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xhr.<span class="function"><span class="title">onreadystatechange</span></span> = ->
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<span class="keyword">if</span> xhr.readyState <span class="keyword">is</span> <span class="number">4</span>
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<span class="keyword">if</span> xhr.status <span class="keyword">in</span> [<span class="number">0</span>, <span class="number">200</span>]
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CoffeeScript.run xhr.responseText, options
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<span class="keyword">else</span>
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<span class="keyword">throw</span> <span class="keyword">new</span> Error <span class="string">"Could not load <span class="subst">#{url}</span>"</span>
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callback() <span class="keyword">if</span> callback
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xhr.send <span class="literal">null</span></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>Activate CoffeeScript in the browser by having it compile and evaluate
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all script tags with a content-type of <code>text/coffeescript</code>.
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This happens on page load.
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</p>
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</div>
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<div class="content"><div class='highlight'><pre><span class="function"><span class="title">runScripts</span></span> = ->
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scripts = document.getElementsByTagName <span class="string">'script'</span>
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coffeetypes = [<span class="string">'text/coffeescript'</span>, <span class="string">'text/literate-coffeescript'</span>]
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coffees = (s <span class="keyword">for</span> s <span class="keyword">in</span> scripts <span class="keyword">when</span> s.type <span class="keyword">in</span> coffeetypes)
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index = <span class="number">0</span>
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length = coffees.length
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<span class="keyword">do</span> <span class="function"><span class="title">execute</span></span> = ->
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script = coffees[index++]
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mediatype = script?.type
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<span class="keyword">if</span> mediatype <span class="keyword">in</span> coffeetypes
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options = {literate: mediatype <span class="keyword">is</span> <span class="string">'text/literate-coffeescript'</span>}
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<span class="keyword">if</span> script.src
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CoffeeScript.load script.src, execute, options
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<span class="keyword">else</span>
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options.sourceFiles = [<span class="string">'embedded'</span>]
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CoffeeScript.run script.innerHTML, options
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execute()
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<span class="literal">null</span></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>Listen for window load, both in decent browsers and in IE.
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</p>
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</div>
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<div class="content"><div class='highlight'><pre><span class="keyword">if</span> window.addEventListener
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addEventListener <span class="string">'DOMContentLoaded'</span>, runScripts, <span class="literal">no</span>
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<span class="keyword">else</span>
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attachEvent <span class="string">'onload'</span>, runScripts</pre></div></div>
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</li>
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</ul>
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</div>
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</body>
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</html>
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