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<h1>browser.coffee</h1>
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<p>This <strong>Browser</strong> compatibility layer extends core CoffeeScript functions
to make things work smoothly when compiling code directly in the browser.
We add support for loading remote Coffee scripts via <strong>XHR</strong>, and
<code>text/coffeescript</code> script tags, source maps via data-URLs, and so on.</p>
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<div class="content"><div class='highlight'><pre>
CoffeeScript = <span class="hljs-built_in">require</span> <span class="hljs-string">'./coffee-script'</span>
CoffeeScript.<span class="hljs-built_in">require</span> = <span class="hljs-built_in">require</span>
compile = CoffeeScript.compile</pre></div></div>
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<p>Use standard JavaScript <code>eval</code> to eval code.</p>
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<div class="content"><div class='highlight'><pre>CoffeeScript.<span class="hljs-function"><span class="hljs-title">eval</span> = <span class="hljs-params">(code, options = {})</span> -></span>
options.bare ?= <span class="hljs-literal">on</span>
eval compile code, options</pre></div></div>
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<p>Running code does not provide access to this scope.</p>
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<div class="content"><div class='highlight'><pre>CoffeeScript.<span class="hljs-function"><span class="hljs-title">run</span> = <span class="hljs-params">(code, options = {})</span> -></span>
options.bare = <span class="hljs-literal">on</span>
options.shiftLine = <span class="hljs-literal">on</span>
Function(compile code, options)()</pre></div></div>
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<p>If we’re not in a browser environment, we’re finished with the public API.</p>
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<div class="content"><div class='highlight'><pre><span class="hljs-keyword">return</span> <span class="hljs-keyword">unless</span> <span class="hljs-built_in">window</span>?</pre></div></div>
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<p>Include source maps where possible. If we’ve got a base64 encoder, a
JSON serializer, and tools for escaping unicode characters, we’re good to go.
Ported from <a href="https://developer.mozilla.org/en-US/docs/DOM/window.btoa">https://developer.mozilla.org/en-US/docs/DOM/window.btoa</a></p>
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<div class="content"><div class='highlight'><pre><span class="hljs-keyword">if</span> btoa? <span class="hljs-keyword">and</span> JSON? <span class="hljs-keyword">and</span> unescape? <span class="hljs-keyword">and</span> encodeURIComponent?
<span class="hljs-function"><span class="hljs-title">compile</span> = <span class="hljs-params">(code, options = {})</span> -></span>
options.sourceMap = <span class="hljs-literal">true</span>
options.inline = <span class="hljs-literal">true</span>
{js, v3SourceMap} = CoffeeScript.compile code, options
<span class="hljs-string">"<span class="hljs-subst">#{js}</span>\n//# sourceMappingURL=data:application/json;base64,<span class="hljs-subst">#{btoa unescape encodeURIComponent v3SourceMap}</span>\n//# sourceURL=coffeescript"</span></pre></div></div>
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<p>Load a remote script from the current domain via XHR.</p>
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<div class="content"><div class='highlight'><pre>CoffeeScript.<span class="hljs-function"><span class="hljs-title">load</span> = <span class="hljs-params">(url, callback, options = {}, hold = <span class="hljs-literal">false</span>)</span> -></span>
options.sourceFiles = [url]
xhr = <span class="hljs-keyword">if</span> <span class="hljs-built_in">window</span>.ActiveXObject
<span class="hljs-keyword">new</span> <span class="hljs-built_in">window</span>.ActiveXObject(<span class="hljs-string">'Microsoft.XMLHTTP'</span>)
<span class="hljs-keyword">else</span>
<span class="hljs-keyword">new</span> <span class="hljs-built_in">window</span>.XMLHttpRequest()
xhr.open <span class="hljs-string">'GET'</span>, url, <span class="hljs-literal">true</span>
xhr.overrideMimeType <span class="hljs-string">'text/plain'</span> <span class="hljs-keyword">if</span> <span class="hljs-string">'overrideMimeType'</span> <span class="hljs-keyword">of</span> xhr
xhr.<span class="hljs-function"><span class="hljs-title">onreadystatechange</span> = -></span>
<span class="hljs-keyword">if</span> xhr.readyState <span class="hljs-keyword">is</span> <span class="hljs-number">4</span>
<span class="hljs-keyword">if</span> xhr.status <span class="hljs-keyword">in</span> [<span class="hljs-number">0</span>, <span class="hljs-number">200</span>]
param = [xhr.responseText, options]
CoffeeScript.run param... <span class="hljs-keyword">unless</span> hold
<span class="hljs-keyword">else</span>
<span class="hljs-keyword">throw</span> <span class="hljs-keyword">new</span> Error <span class="hljs-string">"Could not load <span class="hljs-subst">#{url}</span>"</span>
callback param <span class="hljs-keyword">if</span> callback
xhr.send <span class="hljs-literal">null</span></pre></div></div>
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<p>Activate CoffeeScript in the browser by having it compile and evaluate
all script tags with a content-type of <code>text/coffeescript</code>.
This happens on page load.</p>
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<div class="content"><div class='highlight'><pre><span class="hljs-function"><span class="hljs-title">runScripts</span> = -></span>
scripts = <span class="hljs-built_in">window</span>.<span class="hljs-built_in">document</span>.getElementsByTagName <span class="hljs-string">'script'</span>
coffeetypes = [<span class="hljs-string">'text/coffeescript'</span>, <span class="hljs-string">'text/literate-coffeescript'</span>]
coffees = (s <span class="hljs-keyword">for</span> s <span class="hljs-keyword">in</span> scripts <span class="hljs-keyword">when</span> s.type <span class="hljs-keyword">in</span> coffeetypes)
index = <span class="hljs-number">0</span>
<span class="hljs-function"><span class="hljs-title">execute</span> = -></span>
param = coffees[index]
<span class="hljs-keyword">if</span> param <span class="hljs-keyword">instanceof</span> Array
CoffeeScript.run param...
index++
execute()
<span class="hljs-keyword">for</span> script, i <span class="hljs-keyword">in</span> coffees
<span class="hljs-keyword">do</span> <span class="hljs-function"><span class="hljs-params">(script, i)</span> -></span>
options = <span class="hljs-attribute">literate</span>: script.type <span class="hljs-keyword">is</span> coffeetypes[<span class="hljs-number">1</span>]
source = script.src <span class="hljs-keyword">or</span> script.getAttribute(<span class="hljs-string">'data-src'</span>)
<span class="hljs-keyword">if</span> source
CoffeeScript.load source,
<span class="hljs-function"><span class="hljs-params">(param)</span> -></span>
coffees[i] = param
execute()
options
<span class="hljs-literal">true</span>
<span class="hljs-keyword">else</span>
options.sourceFiles = [<span class="hljs-string">'embedded'</span>]
coffees[i] = [script.innerHTML, options]
execute()</pre></div></div>
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<p>Listen for window load, both in decent browsers and in IE.</p>
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<div class="content"><div class='highlight'><pre><span class="hljs-keyword">if</span> <span class="hljs-built_in">window</span>.addEventListener
<span class="hljs-built_in">window</span>.addEventListener <span class="hljs-string">'DOMContentLoaded'</span>, runScripts, <span class="hljs-literal">no</span>
<span class="hljs-keyword">else</span>
<span class="hljs-built_in">window</span>.attachEvent <span class="hljs-string">'onload'</span>, runScripts</pre></div></div>
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