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POHow to create a small Javascript extension language?
 

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  1. POHow to create a small Javascript extension language?
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    <p>I refactored my JS code recently and stumbled upon this pattern:</p> <pre><code>APP = (function() { var x,y,z; function foo() {} function bar() {} return {x:x, y:y, z:z, foo:foo: bar:bar}; })(); </code></pre> <p>The advantage to this is that it creates non-global variables with the functions having access to everything defined in <code>APP</code>. So <code>APP.foo</code> can access <code>x, y, z</code>, and bar without typing <code>APP.bar()</code>, <code>APP.x</code>, etc. Everything can also be accessed globally with <code>APP.bar()</code>, <code>APP.x</code>, etc. You can also nest them:</p> <pre><code>APP = (function() { var x,y,z; function foo() {} function bar() {} var WIDGETS = (function() { var a,b,c; function hello() {} function world() {} return {a:a, b:b, c:c, hello:hello, world:world}; })(); return {x:x, y:y, z:z, foo:foo: bar:bar, WIDGETS:WIDGETS}; })(); </code></pre> <p>So <code>WIDGETS</code> would have access to variables in <code>APP</code>, but not visa versa (<code>APP.WIDGETS.hello</code> can use <code>foo()</code>, but <code>APP.foo</code> has to use <code>WIDGETS.hello()</code>).</p> <p>I tried creating this pattern using ERB (I'm on Rails), but it turned out messy. So I'm thinking of writing a small source-to-source compiler for this - something like CoffeeScript (with the minimal difference/extended language philosophy of SASS) that just compiles a few functions to alternative javascript.</p> <p>I just want a shorthand.</p> <p>For example, this would compile to my second code block above:</p> <pre><code>//NAMESPACE is a magical function I compile down to the long version in the second code block APP = NAMESPACE(function() { var x,y,z; function foo() {} function bar() {} var WIDGETS = NAMESPACE(function() { var a,b,c; function hello() {} function world() {} //**notice the missing return statement that I don't need to manage and map to my variables** }); //**notice the missing return statement that I don't need to manage and map to my variables** }); </code></pre> <p>Simple and small - just so you don't need to keep track of the variables. Would also like to separate the namespace like thus (so I can split it to multiple files):</p> <pre><code>APP = NAMESPACE(function() { var x,y,z; function foo() {} function bar() {} //**notice the missing return statement that I don't need to manage and map to my variables** }); APP = NAMESPACE(function() { var WIDGETS = NAMESPACE(function() { var a,b,c; function hello() {} function world() {} //**notice the missing return statement that I don't need to manage and map to my variables** }); }); </code></pre> <p>Any thoughts on how to do this? I'm not sure about everything, but I think if this existed, I'd like Javascript a lot more.</p>
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    1. USJasonMArcher
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    1. COYou might well go crazy trying to make this. Have a look at Closure Compiler - some possible overlap there.
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    2. COHmm.. can't seem to find similar functionality. Thanks for the reference though.
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    3. COp.s. check out the answers on this page for more on what CC does, if interested. http://stackoverflow.com/questions/11486022/what-is-closure-compiler
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