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updating documentation for 0.3

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Jeremy Ashkenas 2010-01-26 23:23:59 -05:00
parent 3524d618d8
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14 changed files with 200 additions and 214 deletions
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4
coffee-script.gemspec
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@ -1,7 +1,7 @@
Gem::Specification.new do |s|
s.name = 'coffee-script'
s.version = '0.2.6' # Keep version in sync with coffee-script.rb
s.date = '2010-1-17'
s.version = '0.3.0' # Keep version in sync with coffee-script.rb
s.date = '2010-1-26'
s.homepage = "http://jashkenas.github.com/coffee-script/"
s.summary = "The CoffeeScript Compiler"

4
documentation/coffee/blocks.coffee
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@ -1,4 +0,0 @@
$('table.list').each (table) ->
$('tr.account', table).each (row) ->
row.show()
row.highlight()

0
documentation/coffee/long_arrow.coffee → documentation/coffee/fat_arrow.coffee
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2
documentation/coffee/overview.coffee
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@ -26,4 +26,4 @@ race: (winner, runners...) ->
alert "I knew it!" if elvis?
# Array comprehensions:
cubed_list: math.cube(num) for num in list
cubed_list: math.cube num for num in list

1
documentation/coffee/soaks.coffee Normal file
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@ -0,0 +1 @@
lottery.draw_winner()?.address?.zipcode

4
documentation/coffee/splats.coffee
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@ -1,6 +1,6 @@
gold: silver: the_field: "unknown"
medalists: (first, second, rest...) ->
award_medals: (first, second, rest...) ->
gold: first
silver: second
the_field: rest
@ -18,7 +18,7 @@ contenders: [
"Usain Bolt"
]
medalists contenders...
award_medals contenders...
alert "Gold: " + gold
alert "Silver: " + silver

124
documentation/index.html.erb
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@ -51,7 +51,7 @@
<p>
<b>Latest Version:</b>
<a href="http://gemcutter.org/gems/coffee-script">0.2.6</a>
<a href="http://gemcutter.org/gems/coffee-script">0.3.0</a>
</p>
<h2>Table of Contents</h2>
@ -65,7 +65,6 @@
<a href="#objects_and_arrays">Objects and Arrays</a><br />
<a href="#lexical_scope">Lexical Scoping and Variable Safety</a><br />
<a href="#conditionals">Conditionals, Ternaries, and Conditional Assignment</a><br />
<a href="#existence">The Existential Operator</a><br />
<a href="#aliases">Aliases</a><br />
<a href="#splats">Splats...</a><br />
<a href="#arguments">Arguments are Arrays</a><br />
@ -73,17 +72,16 @@
<a href="#comprehensions">Comprehensions (Arrays, Objects, and Ranges)</a><br />
<a href="#slice_splice">Array Slicing and Splicing with Ranges</a><br />
<a href="#expressions">Everything is an Expression</a><br />
<a href="#existence">The Existential Operator</a><br />
<a href="#inheritance">Inheritance, and Calling Super from a Subclass</a><br />
<a href="#blocks">Blocks</a><br />
<a href="#pattern_matching">Pattern Matching</a><br />
<a href="#long_arrow">Function Binding</a><br />
<a href="#fat_arrow">Function Binding</a><br />
<a href="#embedded">Embedded JavaScript</a><br />
<a href="#switch">Switch/When/Else</a><br />
<a href="#try">Try/Catch/Finally</a><br />
<a href="#comparisons">Chained Comparisons</a><br />
<a href="#strings">Multiline Strings and Heredocs</a><br />
<a href="#resources">Resources</a><br />
<a href="#contributing">Contributing</a><br />
<a href="#change_log">Change Log</a><br />
</p>
@ -188,7 +186,7 @@ gem install coffee-script</pre>
<td><code>-v, --verbose</code></td>
<td>
As the JavaScript is being generated, print out every step of code
generation, including lexical scope and the node in the
generation, including lexical scope and the nodes in the
AST.
</td>
</tr>
@ -248,6 +246,11 @@ coffee --print app/scripts/*.coffee > concatenation.js</pre>
use indentation.
</p>
<p>
You don't need to use parentheses to invoke a function, if you're passing
arguments:<br /><tt>print "coffee"</tt>
</p>
<p>
You can use newlines to break up your expression into smaller pieces,
as long as CoffeeScript can determine that the line hasn't finished yet.
@ -336,20 +339,6 @@ coffee --print app/scripts/*.coffee > concatenation.js</pre>
truthy variables.
</p>
<p id="existence">
<b class="header">The Existential Operator</b>
It's a little difficult to check for the existence of a variable in
JavaScript. <tt>if (variable) ...</tt> comes close, but fails for zero,
the empty string, and false. The existential operator <tt>?</tt> returns true unless
a variable is <b>null</b> or <b>undefined</b>, which makes it analogous
to Ruby's <tt>nil?</tt>
</p>
<p>
It can also be used for safer conditional assignment than <tt>||=</tt>
provides, for cases where you may be handling numbers or strings.
</p>
<%= code_for('existence', 'speed') %>
<p id="aliases">
<b class="header">Aliases</b>
Because the <tt>==</tt> operator frequently causes undesirable coercion,
@ -492,6 +481,35 @@ coffee --print app/scripts/*.coffee > concatenation.js</pre>
CoffeeScript won't try to perform the conversion.
</p>
<p id="existence">
<b class="header">The Existential Operator</b>
It's a little difficult to check for the existence of a variable in
JavaScript. <tt>if (variable) ...</tt> comes close, but fails for zero,
the empty string, and false. CoffeeScript's existential operator <tt>?</tt> returns true unless
a variable is <b>null</b> or <b>undefined</b>, which makes it analogous
to Ruby's <tt>nil?</tt>
</p>
<p>
It can also be used for safer conditional assignment than <tt>||=</tt>
provides, for cases where you may be handling numbers or strings.
</p>
<%= code_for('existence', 'speed') %>
<p>
The accessor variant of the existential operator <tt>?.</tt> can be used to soak
up null references in a chain of properties. Use it instead
of the dot accessor <tt>.</tt> in cases where the base value may be <b>null</b>
or <b>undefined</b>. If all of the properties exist then you'll get the expected
result, if the chain is broken, <b>undefined</b> is returned instead of
the <b>TypeError</b> that would be raised otherwise.
</p>
<%= code_for('soaks') %>
<p>
Soaking up nulls is similar to Ruby's
<a href="http://andand.rubyforge.org/">andand gem</a>, and to the
<a href="http://groovy.codehaus.org/Operators#Operators-SafeNavigationOperator%28%3F.%29">safe navigation operator</a>
in Groovy.
</p>
<p id="inheritance">
<b class="header">Inheritance, and Calling Super from a Subclass</b>
JavaScript's prototypal inheritance has always been a bit of a
@ -514,15 +532,6 @@ coffee --print app/scripts/*.coffee > concatenation.js</pre>
</p>
<%= code_for('super', true) %>
<p id="blocks">
<b class="header">Blocks</b>
Many common looping functions (in Prototype, jQuery, and Underscore,
for example) take a single function as their final argument. To make
final functions easier to pass, CoffeeScript includes block syntax,
so you don't have to close the parentheses on the other side.
</p>
<%= code_for('blocks') %>
<p id="pattern_matching">
<b class="header">Pattern Matching (Destructuring Assignment)</b>
To make extracting values from complex arrays and objects more convenient,
@ -545,16 +554,16 @@ coffee --print app/scripts/*.coffee > concatenation.js</pre>
</p>
<%= code_for('object_extraction', 'poet + " — " + street') %>
<p id="long_arrow">
<p id="fat_arrow">
<b class="header">Function binding</b>
The long arrow <tt>=></tt> can be used to both define a function, and to bind
The fat arrow <tt>=></tt> can be used to both define a function, and to bind
it to the current value of <tt>this</tt>, right on the spot. This is helpful
when using callback-based libraries like Prototype or jQuery, for creating
iterator functions to pass to <tt>each</tt>, or event-handler functions
to use with <tt>bind</tt>. Functions created with the long arrow are able to access
to use with <tt>bind</tt>. Functions created with the fat arrow are able to access
properties of the <tt>this</tt> where they're defined.
</p>
<%= code_for('long_arrow') %>
<%= code_for('fat_arrow') %>
<p id="embedded">
<b class="header">Embedded JavaScript</b>
@ -625,6 +634,12 @@ coffee --print app/scripts/*.coffee > concatenation.js</pre>
<li>
<a href="http://github.com/jashkenas/coffee-script/issues">Bugs, Feature Requests, and General Discussion</a>
</li>
<li>
<a href="http://github.com/creationix/coffeepot">CoffeePot</a><br />
An implementation of CoffeeScript, written in CoffeeScript, by
<a href="http://github.com/creationix">Tim Caswell</a>. Compiles just
a limited subset at this point.
</li>
<li>
<a href="http://github.com/jnicklas/bistro_car">BistroCar</a><br />
A Rails plugin by
@ -640,39 +655,24 @@ coffee --print app/scripts/*.coffee > concatenation.js</pre>
</li>
</ul>
<h2 id="contributing">Contributing</h2>
<h2 id="change_log">Change Log</h2>
<p>
Here's a wish list of things that would be wonderful to have contributed:
<b class="header" style="margin-top: 20px;">0.3.0</b>
CoffeeScript 0.3 includes major syntax changes:
<br />
The function symbol was changed to
<tt>-></tt>, and the bound function symbol is now <tt>=></tt>.
<br />
Parameter lists in function definitions must now be wrapped in parentheses.
<br />
Added property soaking, with the <tt>?.</tt> operator.
<br />
Made parentheses optional, when invoking functions with arguments.
<br />
Removed the obsolete block literal syntax.
</p>
<ul>
<li>
<a href="http://github.com/jashkenas/coffee-script/issues#issue/8">
A CoffeeScript version of the compiler.
</a>
</li>
<li>
Test cases for any syntax errors you encounter that you think CoffeeScript
should be able to compile properly.
</li>
<li>
A tutorial that introduces CoffeeScript from the ground up for folks
without knowledge of JavaScript.
</li>
<li>
Integration with Processing.js's JavaScript API (this would depend on
having a JavaScript version of the compiler).
</li>
<li>
A lot of the code generation in <tt>nodes.rb</tt> gets into messy
string manipulation. Techniques for cleaning this up across the board
would be appreciated.
</li>
</ul>
<h2 id="change_log">Change Log</h2>
<p>
<b class="header" style="margin-top: 20px;">0.2.6</b>
Added Python-style chained comparisons, the conditional existence

8
documentation/js/blocks.js
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@ -1,8 +0,0 @@
(function(){
$('table.list').each(function(table) {
return $('tr.account', table).each(function(row) {
row.show();
return row.highlight();
});
});
})();

0
documentation/js/long_arrow.js → documentation/js/fat_arrow.js
View file

4
documentation/js/soaks.js Normal file
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@ -0,0 +1,4 @@
(function(){
var __a;
((__a = lottery.draw_winner()) == undefined ? undefined : __a.address == undefined ? undefined : __a.address.zipcode);
})();

6
documentation/js/splats.js
View file

@ -1,7 +1,7 @@
(function(){
var contenders, gold, medalists, silver, the_field;
var award_medals, contenders, gold, silver, the_field;
gold = (silver = (the_field = "unknown"));
medalists = function medalists(first, second) {
award_medals = function award_medals(first, second) {
var rest;
rest = Array.prototype.slice.call(arguments, 2);
gold = first;
@ -9,7 +9,7 @@
return the_field = rest;
};
contenders = ["Michael Phelps", "Liu Xiang", "Yao Ming", "Allyson Felix", "Shawn Johnson", "Roman Sebrle", "Guo Jingjing", "Tyson Gay", "Asafa Powell", "Usain Bolt"];
medalists.apply(this, contenders);
award_medals.apply(this, contenders);
alert("Gold: " + gold);
alert("Silver: " + silver);
alert("The Field: " + the_field);

225
index.html
View file

@ -37,7 +37,7 @@
<p>
<b>Latest Version:</b>
<a href="http://gemcutter.org/gems/coffee-script">0.2.6</a>
<a href="http://gemcutter.org/gems/coffee-script">0.3.0</a>
</p>
<h2>Table of Contents</h2>
@ -51,7 +51,6 @@
<a href="#objects_and_arrays">Objects and Arrays</a><br />
<a href="#lexical_scope">Lexical Scoping and Variable Safety</a><br />
<a href="#conditionals">Conditionals, Ternaries, and Conditional Assignment</a><br />
<a href="#existence">The Existential Operator</a><br />
<a href="#aliases">Aliases</a><br />
<a href="#splats">Splats...</a><br />
<a href="#arguments">Arguments are Arrays</a><br />
@ -59,17 +58,16 @@
<a href="#comprehensions">Comprehensions (Arrays, Objects, and Ranges)</a><br />
<a href="#slice_splice">Array Slicing and Splicing with Ranges</a><br />
<a href="#expressions">Everything is an Expression</a><br />
<a href="#existence">The Existential Operator</a><br />
<a href="#inheritance">Inheritance, and Calling Super from a Subclass</a><br />
<a href="#blocks">Blocks</a><br />
<a href="#pattern_matching">Pattern Matching</a><br />
<a href="#long_arrow">Function Binding</a><br />
<a href="#fat_arrow">Function Binding</a><br />
<a href="#embedded">Embedded JavaScript</a><br />
<a href="#switch">Switch/When/Else</a><br />
<a href="#try">Try/Catch/Finally</a><br />
<a href="#comparisons">Chained Comparisons</a><br />
<a href="#strings">Multiline Strings and Heredocs</a><br />
<a href="#resources">Resources</a><br />
<a href="#contributing">Contributing</a><br />
<a href="#change_log">Change Log</a><br />
</p>
@ -85,7 +83,7 @@
<span class="FunctionName">number</span><span class="Keyword">:</span> <span class="Keyword">-</span><span class="Number">42</span> <span class="Keyword">if</span> opposite_day
<span class="Comment"><span class="Comment">#</span> Functions:</span>
<span class="FunctionName">square</span><span class="Keyword">:</span> (x) <span class="Storage">=&gt;</span> x <span class="Keyword">*</span> x
<span class="FunctionName">square</span><span class="Keyword">:</span> <span class="FunctionArgument">(</span><span class="FunctionArgument">x</span><span class="FunctionArgument">)</span> <span class="Storage">-&gt;</span> x <span class="Keyword">*</span> x
<span class="Comment"><span class="Comment">#</span> Arrays:</span>
<span class="FunctionName">list</span><span class="Keyword">:</span> [<span class="Number">1</span>, <span class="Number">2</span>, <span class="Number">3</span>, <span class="Number">4</span>, <span class="Number">5</span>]
@ -94,18 +92,18 @@
<span class="FunctionName">math</span><span class="Keyword">:</span> {
<span class="FunctionName">root</span><span class="Keyword">:</span> Math.sqrt
<span class="FunctionName">square</span><span class="Keyword">:</span> square
<span class="FunctionName">cube</span><span class="Keyword">:</span> (x) <span class="Storage">=&gt;</span> x <span class="Keyword">*</span> square x
<span class="FunctionName">cube</span><span class="Keyword">:</span> <span class="FunctionArgument">(</span><span class="FunctionArgument">x</span><span class="FunctionArgument">)</span> <span class="Storage">-&gt;</span> x <span class="Keyword">*</span> square x
}
<span class="Comment"><span class="Comment">#</span> Splats:</span>
<span class="FunctionName">race</span><span class="Keyword">:</span> (winner, runners...) <span class="Storage">=&gt;</span>
<span class="FunctionName">race</span><span class="Keyword">:</span> <span class="FunctionArgument">(</span><span class="FunctionArgument">winner, runners...</span><span class="FunctionArgument">)</span> <span class="Storage">-&gt;</span>
print winner, runners
<span class="Comment"><span class="Comment">#</span> Existence:</span>
alert <span class="String"><span class="String">&quot;</span>I knew it!<span class="String">&quot;</span></span> <span class="Keyword">if</span> elvis<span class="Keyword">?</span>
<span class="Comment"><span class="Comment">#</span> Array comprehensions:</span>
<span class="FunctionName">cubed_list</span><span class="Keyword">:</span> math.cube(num) <span class="Keyword">for</span> num <span class="Keyword">in</span> list
<span class="FunctionName">cubed_list</span><span class="Keyword">:</span> math.cube num <span class="Keyword">for</span> num <span class="Keyword">in</span> list
</pre><pre class="idle"><span class="Storage">var</span> __a, __b, __c, cubed_list, list, math, num, number, opposite_day, race, square;
<span class="Comment"><span class="Comment">//</span> Assignment:</span>
number <span class="Keyword">=</span> <span class="Number">42</span>;
@ -285,7 +283,7 @@ gem install coffee-script</pre>
<td><code>-v, --verbose</code></td>
<td>
As the JavaScript is being generated, print out every step of code
generation, including lexical scope and the node in the
generation, including lexical scope and the nodes in the
AST.
</td>
</tr>
@ -345,6 +343,11 @@ coffee --print app/scripts/*.coffee > concatenation.js</pre>
use indentation.
</p>
<p>
You don't need to use parentheses to invoke a function, if you're passing
arguments:<br /><tt>print "coffee"</tt>
</p>
<p>
You can use newlines to break up your expression into smaller pieces,
as long as CoffeeScript can determine that the line hasn't finished yet.
@ -356,8 +359,8 @@ coffee --print app/scripts/*.coffee > concatenation.js</pre>
function body. The empty function looks like this: <tt>-></tt>. All
functions in CoffeeScript are named by default, for easier debugging.
</p>
<div class='code'><pre class="idle"><span class="FunctionName">square</span><span class="Keyword">:</span> (x) <span class="Storage">=&gt;</span> x <span class="Keyword">*</span> x
<span class="FunctionName">cube</span><span class="Keyword">:</span> (x) <span class="Storage">=&gt;</span> square(x) <span class="Keyword">*</span> x
<div class='code'><pre class="idle"><span class="FunctionName">square</span><span class="Keyword">:</span> <span class="FunctionArgument">(</span><span class="FunctionArgument">x</span><span class="FunctionArgument">)</span> <span class="Storage">-&gt;</span> x <span class="Keyword">*</span> x
<span class="FunctionName">cube</span><span class="Keyword">:</span> <span class="FunctionArgument">(</span><span class="FunctionArgument">x</span><span class="FunctionArgument">)</span> <span class="Storage">-&gt;</span> square(x) <span class="Keyword">*</span> x
</pre><pre class="idle"><span class="Storage">var</span> cube, square;
square <span class="Keyword">=</span> <span class="Storage">function</span> <span class="FunctionName">square</span>(<span class="FunctionArgument">x</span>) {
<span class="Keyword">return</span> x <span class="Keyword">*</span> x;
@ -444,7 +447,7 @@ matrix = [1, 0, 1, 0, 0, 1, 1, 1, 0];
<tt>var</tt> yourself.
</p>
<div class='code'><pre class="idle"><span class="FunctionName">num</span><span class="Keyword">:</span> <span class="Number">1</span>
<span class="FunctionName">change_numbers</span><span class="Keyword">:</span> () <span class="Storage">=&gt;</span>
<span class="FunctionName">change_numbers</span><span class="Keyword">:</span> <span class="Storage">-&gt;</span>
<span class="FunctionName">new_num</span><span class="Keyword">:</span> <span class="Keyword">-</span><span class="Number">1</span>
<span class="FunctionName">num</span><span class="Keyword">:</span> <span class="Number">10</span>
<span class="FunctionName">new_num</span><span class="Keyword">:</span> change_numbers()
@ -526,38 +529,6 @@ expensive <span class="Keyword">=</span> expensive <span class="Keyword">||</spa
truthy variables.
</p>
<p id="existence">
<b class="header">The Existential Operator</b>
It's a little difficult to check for the existence of a variable in
JavaScript. <tt>if (variable) ...</tt> comes close, but fails for zero,
the empty string, and false. The existential operator <tt>?</tt> returns true unless
a variable is <b>null</b> or <b>undefined</b>, which makes it analogous
to Ruby's <tt>nil?</tt>
</p>
<p>
It can also be used for safer conditional assignment than <tt>||=</tt>
provides, for cases where you may be handling numbers or strings.
</p>
<div class='code'><pre class="idle"><span class="FunctionName">solipsism</span><span class="Keyword">:</span> <span class="BuiltInConstant">true</span> <span class="Keyword">if</span> mind<span class="Keyword">?</span> <span class="Keyword">and</span> <span class="Keyword">not</span> world<span class="Keyword">?</span>
speed <span class="Keyword">?</span><span class="Keyword">=</span> <span class="Number">140</span>
</pre><pre class="idle"><span class="Storage">var</span> solipsism, speed;
<span class="Keyword">if</span> ((<span class="Keyword">typeof</span> mind <span class="Keyword">!</span><span class="Keyword">==</span> <span class="String"><span class="String">&quot;</span>undefined<span class="String">&quot;</span></span> <span class="Keyword">&amp;</span><span class="Keyword">&amp;</span> mind <span class="Keyword">!</span><span class="Keyword">==</span> <span class="BuiltInConstant">null</span>) <span class="Keyword">&amp;</span><span class="Keyword">&amp;</span> <span class="Keyword">!</span>(<span class="Keyword">typeof</span> world <span class="Keyword">!</span><span class="Keyword">==</span> <span class="String"><span class="String">&quot;</span>undefined<span class="String">&quot;</span></span> <span class="Keyword">&amp;</span><span class="Keyword">&amp;</span> world <span class="Keyword">!</span><span class="Keyword">==</span> <span class="BuiltInConstant">null</span>)) {
solipsism <span class="Keyword">=</span> <span class="BuiltInConstant">true</span>;
}
speed <span class="Keyword">=</span> (<span class="Keyword">typeof</span> speed <span class="Keyword">!</span><span class="Keyword">==</span> <span class="String"><span class="String">&quot;</span>undefined<span class="String">&quot;</span></span> <span class="Keyword">&amp;</span><span class="Keyword">&amp;</span> speed <span class="Keyword">!</span><span class="Keyword">==</span> <span class="BuiltInConstant">null</span>) ? speed : <span class="Number">140</span>;
</pre><button onclick='javascript: var solipsism, speed;
if ((typeof mind !== "undefined" && mind !== null) && !(typeof world !== "undefined" && world !== null)) {
solipsism = true;
}
speed = (typeof speed !== "undefined" && speed !== null) ? speed : 140;
;alert(speed);'>run: speed</button><br class='clear' /></div>
<p id="aliases">
<b class="header">Aliases</b>
Because the <tt>==</tt> operator frequently causes undesirable coercion,
@ -615,7 +586,7 @@ car.speed <span class="Keyword">&lt;</span> speed_limit ? accelerate() : <span c
</p>
<div class='code'><pre class="idle"><span class="FunctionName">gold</span><span class="Keyword">:</span> <span class="FunctionName">silver</span><span class="Keyword">:</span> <span class="FunctionName">the_field</span><span class="Keyword">:</span> <span class="String"><span class="String">&quot;</span>unknown<span class="String">&quot;</span></span>
<span class="FunctionName">medalists</span><span class="Keyword">:</span> (first, second, rest...) <span class="Storage">=&gt;</span>
<span class="FunctionName">award_medals</span><span class="Keyword">:</span> <span class="FunctionArgument">(</span><span class="FunctionArgument">first, second, rest...</span><span class="FunctionArgument">)</span> <span class="Storage">-&gt;</span>
<span class="FunctionName">gold</span><span class="Keyword">:</span> first
<span class="FunctionName">silver</span><span class="Keyword">:</span> second
<span class="FunctionName">the_field</span><span class="Keyword">:</span> rest
@ -633,14 +604,14 @@ car.speed <span class="Keyword">&lt;</span> speed_limit ? accelerate() : <span c
<span class="String"><span class="String">&quot;</span>Usain Bolt<span class="String">&quot;</span></span>
]
medalists contenders...
award_medals contenders...
alert <span class="String"><span class="String">&quot;</span>Gold: <span class="String">&quot;</span></span> <span class="Keyword">+</span> gold
alert <span class="String"><span class="String">&quot;</span>Silver: <span class="String">&quot;</span></span> <span class="Keyword">+</span> silver
alert <span class="String"><span class="String">&quot;</span>The Field: <span class="String">&quot;</span></span> <span class="Keyword">+</span> the_field
</pre><pre class="idle"><span class="Storage">var</span> contenders, gold, medalists, silver, the_field;
</pre><pre class="idle"><span class="Storage">var</span> award_medals, contenders, gold, silver, the_field;
gold <span class="Keyword">=</span> (silver <span class="Keyword">=</span> (the_field <span class="Keyword">=</span> <span class="String"><span class="String">&quot;</span>unknown<span class="String">&quot;</span></span>));
medalists <span class="Keyword">=</span> <span class="Storage">function</span> <span class="FunctionName">medalists</span>(<span class="FunctionArgument">first, second</span>) {
award_medals <span class="Keyword">=</span> <span class="Storage">function</span> <span class="FunctionName">award_medals</span>(<span class="FunctionArgument">first, second</span>) {
<span class="Storage">var</span> rest;
rest <span class="Keyword">=</span> <span class="LibraryClassType">Array</span>.<span class="LibraryConstant">prototype</span>.slice.<span class="LibraryFunction">call</span>(arguments, <span class="Number">2</span>);
gold <span class="Keyword">=</span> first;
@ -648,13 +619,13 @@ medalists <span class="Keyword">=</span> <span class="Storage">function</span> <
<span class="Keyword">return</span> the_field <span class="Keyword">=</span> rest;
};
contenders <span class="Keyword">=</span> [<span class="String"><span class="String">&quot;</span>Michael Phelps<span class="String">&quot;</span></span>, <span class="String"><span class="String">&quot;</span>Liu Xiang<span class="String">&quot;</span></span>, <span class="String"><span class="String">&quot;</span>Yao Ming<span class="String">&quot;</span></span>, <span class="String"><span class="String">&quot;</span>Allyson Felix<span class="String">&quot;</span></span>, <span class="String"><span class="String">&quot;</span>Shawn Johnson<span class="String">&quot;</span></span>, <span class="String"><span class="String">&quot;</span>Roman Sebrle<span class="String">&quot;</span></span>, <span class="String"><span class="String">&quot;</span>Guo Jingjing<span class="String">&quot;</span></span>, <span class="String"><span class="String">&quot;</span>Tyson Gay<span class="String">&quot;</span></span>, <span class="String"><span class="String">&quot;</span>Asafa Powell<span class="String">&quot;</span></span>, <span class="String"><span class="String">&quot;</span>Usain Bolt<span class="String">&quot;</span></span>];
medalists.<span class="LibraryFunction">apply</span>(<span class="Variable">this</span>, contenders);
award_medals.<span class="LibraryFunction">apply</span>(<span class="Variable">this</span>, contenders);
<span class="LibraryFunction">alert</span>(<span class="String"><span class="String">&quot;</span>Gold: <span class="String">&quot;</span></span> <span class="Keyword">+</span> gold);
<span class="LibraryFunction">alert</span>(<span class="String"><span class="String">&quot;</span>Silver: <span class="String">&quot;</span></span> <span class="Keyword">+</span> silver);
<span class="LibraryFunction">alert</span>(<span class="String"><span class="String">&quot;</span>The Field: <span class="String">&quot;</span></span> <span class="Keyword">+</span> the_field);
</pre><button onclick='javascript: var contenders, gold, medalists, silver, the_field;
</pre><button onclick='javascript: var award_medals, contenders, gold, silver, the_field;
gold = (silver = (the_field = "unknown"));
medalists = function medalists(first, second) {
award_medals = function award_medals(first, second) {
var rest;
rest = Array.prototype.slice.call(arguments, 2);
gold = first;
@ -662,7 +633,7 @@ medalists = function medalists(first, second) {
return the_field = rest;
};
contenders = ["Michael Phelps", "Liu Xiang", "Yao Ming", "Allyson Felix", "Shawn Johnson", "Roman Sebrle", "Guo Jingjing", "Tyson Gay", "Asafa Powell", "Usain Bolt"];
medalists.apply(this, contenders);
award_medals.apply(this, contenders);
alert("Gold: " + gold);
alert("Silver: " + silver);
alert("The Field: " + the_field);
@ -675,7 +646,7 @@ alert("The Field: " + the_field);
<a href="https://developer.mozilla.org/En/Core_JavaScript_1.5_Reference/Objects/Array">Array methods</a>
available.
</p>
<div class='code'><pre class="idle"><span class="FunctionName">backwards</span><span class="Keyword">:</span> () <span class="Storage">=&gt;</span>
<div class='code'><pre class="idle"><span class="FunctionName">backwards</span><span class="Keyword">:</span> <span class="Storage">-&gt;</span>
alert arguments.reverse()
backwards <span class="String"><span class="String">&quot;</span>stairway<span class="String">&quot;</span></span>, <span class="String"><span class="String">&quot;</span>to<span class="String">&quot;</span></span>, <span class="String"><span class="String">&quot;</span>heaven<span class="String">&quot;</span></span>
@ -807,7 +778,7 @@ __d <span class="Keyword">=</span> asteroids;
</p>
<div class='code'><pre class="idle"><span class="FunctionName">countdown</span><span class="Keyword">:</span> num <span class="Keyword">for</span> num <span class="Keyword">in</span> [<span class="Number">10</span>..<span class="Number">1</span>]
<span class="FunctionName">egg_delivery</span><span class="Keyword">:</span> () <span class="Storage">=&gt;</span>
<span class="FunctionName">egg_delivery</span><span class="Keyword">:</span> <span class="Storage">-&gt;</span>
<span class="Keyword">for</span> i <span class="Keyword">in</span> [<span class="Number">0</span>...eggs.length] <span class="Keyword">by</span> <span class="Number">12</span>
<span class="FunctionName">dozen_eggs</span><span class="Keyword">:</span> eggs[i...i<span class="Keyword">+</span><span class="Number">12</span>]
deliver <span class="Keyword">new</span> <span class="TypeName">egg_carton</span>(dozen)
@ -945,7 +916,7 @@ numbers.splice.apply(numbers, [3, 6 - 3 + 1].concat([-3, -4, -5, -6]));
pushed down into each possible branch of execution, in the function
below.
</p>
<div class='code'><pre class="idle"><span class="FunctionName">grade</span><span class="Keyword">:</span> (student) <span class="Storage">=&gt;</span>
<div class='code'><pre class="idle"><span class="FunctionName">grade</span><span class="Keyword">:</span> <span class="FunctionArgument">(</span><span class="FunctionArgument">student</span><span class="FunctionArgument">)</span> <span class="Storage">-&gt;</span>
<span class="Keyword">if</span> student.excellent_work
<span class="String"><span class="String">&quot;</span>A+<span class="String">&quot;</span></span>
<span class="Keyword">else</span> <span class="Keyword">if</span> student.okay_stuff
@ -1058,6 +1029,56 @@ globals = ((function() {
CoffeeScript won't try to perform the conversion.
</p>
<p id="existence">
<b class="header">The Existential Operator</b>
It's a little difficult to check for the existence of a variable in
JavaScript. <tt>if (variable) ...</tt> comes close, but fails for zero,
the empty string, and false. CoffeeScript's existential operator <tt>?</tt> returns true unless
a variable is <b>null</b> or <b>undefined</b>, which makes it analogous
to Ruby's <tt>nil?</tt>
</p>
<p>
It can also be used for safer conditional assignment than <tt>||=</tt>
provides, for cases where you may be handling numbers or strings.
</p>
<div class='code'><pre class="idle"><span class="FunctionName">solipsism</span><span class="Keyword">:</span> <span class="BuiltInConstant">true</span> <span class="Keyword">if</span> mind<span class="Keyword">?</span> <span class="Keyword">and</span> <span class="Keyword">not</span> world<span class="Keyword">?</span>
speed <span class="Keyword">?</span><span class="Keyword">=</span> <span class="Number">140</span>
</pre><pre class="idle"><span class="Storage">var</span> solipsism, speed;
<span class="Keyword">if</span> ((<span class="Keyword">typeof</span> mind <span class="Keyword">!</span><span class="Keyword">==</span> <span class="String"><span class="String">&quot;</span>undefined<span class="String">&quot;</span></span> <span class="Keyword">&amp;</span><span class="Keyword">&amp;</span> mind <span class="Keyword">!</span><span class="Keyword">==</span> <span class="BuiltInConstant">null</span>) <span class="Keyword">&amp;</span><span class="Keyword">&amp;</span> <span class="Keyword">!</span>(<span class="Keyword">typeof</span> world <span class="Keyword">!</span><span class="Keyword">==</span> <span class="String"><span class="String">&quot;</span>undefined<span class="String">&quot;</span></span> <span class="Keyword">&amp;</span><span class="Keyword">&amp;</span> world <span class="Keyword">!</span><span class="Keyword">==</span> <span class="BuiltInConstant">null</span>)) {
solipsism <span class="Keyword">=</span> <span class="BuiltInConstant">true</span>;
}
speed <span class="Keyword">=</span> (<span class="Keyword">typeof</span> speed <span class="Keyword">!</span><span class="Keyword">==</span> <span class="String"><span class="String">&quot;</span>undefined<span class="String">&quot;</span></span> <span class="Keyword">&amp;</span><span class="Keyword">&amp;</span> speed <span class="Keyword">!</span><span class="Keyword">==</span> <span class="BuiltInConstant">null</span>) ? speed : <span class="Number">140</span>;
</pre><button onclick='javascript: var solipsism, speed;
if ((typeof mind !== "undefined" && mind !== null) && !(typeof world !== "undefined" && world !== null)) {
solipsism = true;
}
speed = (typeof speed !== "undefined" && speed !== null) ? speed : 140;
;alert(speed);'>run: speed</button><br class='clear' /></div>
<p>
The accessor variant of the existential operator <tt>?.</tt> can be used to soak
up null references in a chain of properties. Use it instead
of the dot accessor <tt>.</tt> in cases where the base value may be <b>null</b>
or <b>undefined</b>. If all of the properties exist then you'll get the expected
result, if the chain is broken, <b>undefined</b> is returned instead of
the <b>TypeError</b> that would be raised otherwise.
</p>
<div class='code'><pre class="idle">lottery.draw_winner()<span class="Keyword">?</span>.address<span class="Keyword">?</span>.zipcode
</pre><pre class="idle"><span class="Storage">var</span> __a;
((__a <span class="Keyword">=</span> lottery.draw_winner()) <span class="Keyword">==</span> undefined ? undefined : __a.address <span class="Keyword">==</span> undefined ? undefined : __a.address.zipcode);
</pre><br class='clear' /></div>
<p>
Soaking up nulls is similar to Ruby's
<a href="http://andand.rubyforge.org/">andand gem</a>, and to the
<a href="http://groovy.codehaus.org/Operators#Operators-SafeNavigationOperator%28%3F.%29">safe navigation operator</a>
in Groovy.
</p>
<p id="inheritance">
<b class="header">Inheritance, and Calling Super from a Subclass</b>
JavaScript's prototypal inheritance has always been a bit of a
@ -1078,19 +1099,19 @@ globals = ((function() {
object's prototype, and converts <tt>super()</tt> into a call against
the immediate ancestor's method of the same name.
</p>
<div class='code'><pre class="idle"><span class="FunctionName">Animal</span><span class="Keyword">:</span> () <span class="Storage">=&gt;</span>
<span class="FunctionName">Animal::move</span><span class="Keyword">:</span> (meters) <span class="Storage">=&gt;</span>
<div class='code'><pre class="idle"><span class="FunctionName">Animal</span><span class="Keyword">:</span> <span class="Storage">-&gt;</span>
<span class="FunctionName">Animal::move</span><span class="Keyword">:</span> <span class="FunctionArgument">(</span><span class="FunctionArgument">meters</span><span class="FunctionArgument">)</span> <span class="Storage">-&gt;</span>
alert <span class="Variable">this</span>.name <span class="Keyword">+</span> <span class="String"><span class="String">&quot;</span> moved <span class="String">&quot;</span></span> <span class="Keyword">+</span> meters <span class="Keyword">+</span> <span class="String"><span class="String">&quot;</span>m.<span class="String">&quot;</span></span>
<span class="FunctionName">Snake</span><span class="Keyword">:</span> (name) <span class="Storage">=&gt;</span> <span class="FunctionName">this.name</span><span class="Keyword">:</span> name
<span class="FunctionName">Snake</span><span class="Keyword">:</span> <span class="FunctionArgument">(</span><span class="FunctionArgument">name</span><span class="FunctionArgument">)</span> <span class="Storage">-&gt;</span> <span class="FunctionName">this.name</span><span class="Keyword">:</span> name
Snake <span class="Variable">extends</span> Animal
<span class="FunctionName">Snake::move</span><span class="Keyword">:</span> () <span class="Storage">=&gt;</span>
<span class="FunctionName">Snake::move</span><span class="Keyword">:</span> <span class="Storage">-&gt;</span>
alert <span class="String"><span class="String">&quot;</span>Slithering...<span class="String">&quot;</span></span>
<span class="Variable">super</span> <span class="Number">5</span>
<span class="FunctionName">Horse</span><span class="Keyword">:</span> (name) <span class="Storage">=&gt;</span> <span class="FunctionName">this.name</span><span class="Keyword">:</span> name
<span class="FunctionName">Horse</span><span class="Keyword">:</span> <span class="FunctionArgument">(</span><span class="FunctionArgument">name</span><span class="FunctionArgument">)</span> <span class="Storage">-&gt;</span> <span class="FunctionName">this.name</span><span class="Keyword">:</span> name
Horse <span class="Variable">extends</span> Animal
<span class="FunctionName">Horse::move</span><span class="Keyword">:</span> () <span class="Storage">=&gt;</span>
<span class="FunctionName">Horse::move</span><span class="Keyword">:</span> <span class="Storage">-&gt;</span>
alert <span class="String"><span class="String">&quot;</span>Galloping...<span class="String">&quot;</span></span>
<span class="Variable">super</span> <span class="Number">45</span>
@ -1179,25 +1200,6 @@ sam.move();
tom.move();
;'>run</button><br class='clear' /></div>
<p id="blocks">
<b class="header">Blocks</b>
Many common looping functions (in Prototype, jQuery, and Underscore,
for example) take a single function as their final argument. To make
final functions easier to pass, CoffeeScript includes block syntax,
so you don't have to close the parentheses on the other side.
</p>
<div class='code'><pre class="idle">$(<span class="String"><span class="String">'</span>table.list<span class="String">'</span></span>).each (table) <span class="Storage">=&gt;</span>
$(<span class="String"><span class="String">'</span>tr.account<span class="String">'</span></span>, table).each (row) <span class="Storage">=&gt;</span>
row.show()
row.highlight()
</pre><pre class="idle"><span class="Keyword">$</span>(<span class="String"><span class="String">'</span>table.list<span class="String">'</span></span>).each(<span class="Storage">function</span>(table) {
<span class="Keyword">return</span> <span class="Keyword">$</span>(<span class="String"><span class="String">'</span>tr.account<span class="String">'</span></span>, table).each(<span class="Storage">function</span>(row) {
row.show();
<span class="Keyword">return</span> row.highlight();
});
});
</pre><br class='clear' /></div>
<p id="pattern_matching">
<b class="header">Pattern Matching (Destructuring Assignment)</b>
To make extracting values from complex arrays and objects more convenient,
@ -1229,7 +1231,7 @@ and_switch = __a[1];
But it's also helpful for dealing with functions that return multiple
values.
</p>
<div class='code'><pre class="idle"><span class="FunctionName">weather_report</span><span class="Keyword">:</span> (location) <span class="Storage">=&gt;</span>
<div class='code'><pre class="idle"><span class="FunctionName">weather_report</span><span class="Keyword">:</span> <span class="FunctionArgument">(</span><span class="FunctionArgument">location</span><span class="FunctionArgument">)</span> <span class="Storage">-&gt;</span>
<span class="Comment"><span class="Comment">#</span> Make an Ajax request to fetch the weather...</span>
[location, <span class="Number">72</span>, <span class="String"><span class="String">&quot;</span>Mostly Sunny<span class="String">&quot;</span></span>]
@ -1302,20 +1304,20 @@ street = __c[0];
city = __c[1];
;alert(poet + " — " + street);'>run: poet + " — " + street</button><br class='clear' /></div>
<p id="long_arrow">
<p id="fat_arrow">
<b class="header">Function binding</b>
The long arrow <tt>=></tt> can be used to both define a function, and to bind
The fat arrow <tt>=></tt> can be used to both define a function, and to bind
it to the current value of <tt>this</tt>, right on the spot. This is helpful
when using callback-based libraries like Prototype or jQuery, for creating
iterator functions to pass to <tt>each</tt>, or event-handler functions
to use with <tt>bind</tt>. Functions created with the long arrow are able to access
to use with <tt>bind</tt>. Functions created with the fat arrow are able to access
properties of the <tt>this</tt> where they're defined.
</p>
<div class='code'><pre class="idle"><span class="FunctionName">Account</span><span class="Keyword">:</span> (customer, cart) <span class="Storage">=&gt;</span>
<div class='code'><pre class="idle"><span class="FunctionName">Account</span><span class="Keyword">:</span> <span class="FunctionArgument">(</span><span class="FunctionArgument">customer, cart</span><span class="FunctionArgument">)</span> <span class="Storage">-&gt;</span>
<span class="FunctionName">this.customer</span><span class="Keyword">:</span> customer
<span class="FunctionName">this.cart</span><span class="Keyword">:</span> cart
$(<span class="String"><span class="String">'</span>.shopping_cart<span class="String">'</span></span>).bind(<span class="String"><span class="String">'</span>click<span class="String">'</span></span>) (event) <span class="Storage">==&gt;</span>
$(<span class="String"><span class="String">'</span>.shopping_cart<span class="String">'</span></span>).bind <span class="String"><span class="String">'</span>click<span class="String">'</span></span>, <span class="FunctionArgument">(</span><span class="FunctionArgument">event</span><span class="FunctionArgument">)</span> <span class="Storage">=&gt;</span>
<span class="Variable">this</span>.customer.purchase <span class="Variable">this</span>.cart
</pre><pre class="idle"><span class="Storage">var</span> Account;
Account <span class="Keyword">=</span> <span class="Storage">function</span> <span class="FunctionName">Account</span>(<span class="FunctionArgument">customer, cart</span>) {
@ -1497,6 +1499,12 @@ html <span class="Keyword">=</span> <span class="String"><span class="String">&q
<li>
<a href="http://github.com/jashkenas/coffee-script/issues">Bugs, Feature Requests, and General Discussion</a>
</li>
<li>
<a href="http://github.com/creationix/coffeepot">CoffeePot</a><br />
An implementation of CoffeeScript, written in CoffeeScript, by
<a href="http://github.com/creationix">Tim Caswell</a>. Compiles just
a limited subset at this point.
</li>
<li>
<a href="http://github.com/jnicklas/bistro_car">BistroCar</a><br />
A Rails plugin by
@ -1512,39 +1520,24 @@ html <span class="Keyword">=</span> <span class="String"><span class="String">&q
</li>
</ul>
<h2 id="contributing">Contributing</h2>
<h2 id="change_log">Change Log</h2>
<p>
Here's a wish list of things that would be wonderful to have contributed:
<b class="header" style="margin-top: 20px;">0.3.0</b>
CoffeeScript 0.3 includes major syntax changes:
<br />
The function symbol was changed to
<tt>-></tt>, and the bound function symbol is now <tt>=></tt>.
<br />
Parameter lists in function definitions must now be wrapped in parentheses.
<br />
Added property soaking, with the <tt>?.</tt> operator.
<br />
Made parentheses optional, when invoking functions with arguments.
<br />
Removed the obsolete block literal syntax.
</p>
<ul>
<li>
<a href="http://github.com/jashkenas/coffee-script/issues#issue/8">
A CoffeeScript version of the compiler.
</a>
</li>
<li>
Test cases for any syntax errors you encounter that you think CoffeeScript
should be able to compile properly.
</li>
<li>
A tutorial that introduces CoffeeScript from the ground up for folks
without knowledge of JavaScript.
</li>
<li>
Integration with Processing.js's JavaScript API (this would depend on
having a JavaScript version of the compiler).
</li>
<li>
A lot of the code generation in <tt>nodes.rb</tt> gets into messy
string manipulation. Techniques for cleaning this up across the board
would be appreciated.
</li>
</ul>
<h2 id="change_log">Change Log</h2>
<p>
<b class="header" style="margin-top: 20px;">0.2.6</b>
Added Python-style chained comparisons, the conditional existence

2
lib/coffee-script.rb
View file

@ -10,7 +10,7 @@ require "coffee_script/parse_error"
# Namespace for all CoffeeScript internal classes.
module CoffeeScript
VERSION = '0.2.6' # Keep in sync with the gemspec.
VERSION = '0.3.0' # Keep in sync with the gemspec.
# Compile a script (String or IO) to JavaScript.
def self.compile(script, options={})

2
package.json
View file

@ -5,5 +5,5 @@
"description": "Unfancy JavaScript",
"keywords": ["javascript", "language"],
"author": "Jeremy Ashkenas",
"version": "0.2.6"
"version": "0.3.0"
}