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      1 <!doctype html>
      2 
      3 <title>CodeMirror: CoffeeScript mode</title>
      4 <meta charset="utf-8"/>
      5 <link rel=stylesheet href="../../doc/docs.css">
      6 
      7 <link rel="stylesheet" href="../../lib/codemirror.css">
      8 <script src="../../lib/codemirror.js"></script>
      9 <script src="coffeescript.js"></script>
     10 <style>.CodeMirror {border-top: 1px solid silver; border-bottom: 1px solid silver;}</style>
     11 <div id=nav>
     12   <a href="http://codemirror.net"><h1>CodeMirror</h1><img id=logo src="../../doc/logo.png"></a>
     13 
     14   <ul>
     15     <li><a href="../../index.html">Home</a>
     16     <li><a href="../../doc/manual.html">Manual</a>
     17     <li><a href="https://github.com/codemirror/codemirror">Code</a>
     18   </ul>
     19   <ul>
     20     <li><a href="../index.html">Language modes</a>
     21     <li><a class=active href="#">CoffeeScript</a>
     22   </ul>
     23 </div>
     24 
     25 <article>
     26 <h2>CoffeeScript mode</h2>
     27 <form><textarea id="code" name="code">
     28 # CoffeeScript mode for CodeMirror
     29 # Copyright (c) 2011 Jeff Pickhardt, released under
     30 # the MIT License.
     31 #
     32 # Modified from the Python CodeMirror mode, which also is 
     33 # under the MIT License Copyright (c) 2010 Timothy Farrell.
     34 #
     35 # The following script, Underscore.coffee, is used to 
     36 # demonstrate CoffeeScript mode for CodeMirror.
     37 #
     38 # To download CoffeeScript mode for CodeMirror, go to:
     39 # https://github.com/pickhardt/coffeescript-codemirror-mode
     40 
     41 # **Underscore.coffee
     42 # (c) 2011 Jeremy Ashkenas, DocumentCloud Inc.**
     43 # Underscore is freely distributable under the terms of the
     44 # [MIT license](http://en.wikipedia.org/wiki/MIT_License).
     45 # Portions of Underscore are inspired by or borrowed from
     46 # [Prototype.js](http://prototypejs.org/api), Oliver Steele's
     47 # [Functional](http://osteele.com), and John Resig's
     48 # [Micro-Templating](http://ejohn.org).
     49 # For all details and documentation:
     50 # http://documentcloud.github.com/underscore/
     51 
     52 
     53 # Baseline setup
     54 # --------------
     55 
     56 # Establish the root object, `window` in the browser, or `global` on the server.
     57 root = this
     58 
     59 
     60 # Save the previous value of the `_` variable.
     61 previousUnderscore = root._
     62 
     63 ### Multiline
     64     comment
     65 ###
     66 
     67 # Establish the object that gets thrown to break out of a loop iteration.
     68 # `StopIteration` is SOP on Mozilla.
     69 breaker = if typeof(StopIteration) is 'undefined' then '__break__' else StopIteration
     70 
     71 
     72 #### Docco style single line comment (title)
     73 
     74 
     75 # Helper function to escape **RegExp** contents, because JS doesn't have one.
     76 escapeRegExp = (string) -> string.replace(/([.*+?^${}()|[\]\/\\])/g, '\\$1')
     77 
     78 
     79 # Save bytes in the minified (but not gzipped) version:
     80 ArrayProto = Array.prototype
     81 ObjProto = Object.prototype
     82 
     83 
     84 # Create quick reference variables for speed access to core prototypes.
     85 slice = ArrayProto.slice
     86 unshift = ArrayProto.unshift
     87 toString = ObjProto.toString
     88 hasOwnProperty = ObjProto.hasOwnProperty
     89 propertyIsEnumerable = ObjProto.propertyIsEnumerable
     90 
     91 
     92 # All **ECMA5** native implementations we hope to use are declared here.
     93 nativeForEach = ArrayProto.forEach
     94 nativeMap = ArrayProto.map
     95 nativeReduce = ArrayProto.reduce
     96 nativeReduceRight = ArrayProto.reduceRight
     97 nativeFilter = ArrayProto.filter
     98 nativeEvery = ArrayProto.every
     99 nativeSome = ArrayProto.some
    100 nativeIndexOf = ArrayProto.indexOf
    101 nativeLastIndexOf = ArrayProto.lastIndexOf
    102 nativeIsArray = Array.isArray
    103 nativeKeys = Object.keys
    104 
    105 
    106 # Create a safe reference to the Underscore object for use below.
    107 _ = (obj) -> new wrapper(obj)
    108 
    109 
    110 # Export the Underscore object for **CommonJS**.
    111 if typeof(exports) != 'undefined' then exports._ = _
    112 
    113 
    114 # Export Underscore to global scope.
    115 root._ = _
    116 
    117 
    118 # Current version.
    119 _.VERSION = '1.1.0'
    120 
    121 
    122 # Collection Functions
    123 # --------------------
    124 
    125 # The cornerstone, an **each** implementation.
    126 # Handles objects implementing **forEach**, arrays, and raw objects.
    127 _.each = (obj, iterator, context) ->
    128   try
    129     if nativeForEach and obj.forEach is nativeForEach
    130       obj.forEach iterator, context
    131     else if _.isNumber obj.length
    132       iterator.call context, obj[i], i, obj for i in [0...obj.length]
    133     else
    134       iterator.call context, val, key, obj for own key, val of obj
    135   catch e
    136     throw e if e isnt breaker
    137   obj
    138 
    139 
    140 # Return the results of applying the iterator to each element. Use JavaScript
    141 # 1.6's version of **map**, if possible.
    142 _.map = (obj, iterator, context) ->
    143   return obj.map(iterator, context) if nativeMap and obj.map is nativeMap
    144   results = []
    145   _.each obj, (value, index, list) ->
    146     results.push iterator.call context, value, index, list
    147   results
    148 
    149 
    150 # **Reduce** builds up a single result from a list of values. Also known as
    151 # **inject**, or **foldl**. Uses JavaScript 1.8's version of **reduce**, if possible.
    152 _.reduce = (obj, iterator, memo, context) ->
    153   if nativeReduce and obj.reduce is nativeReduce
    154     iterator = _.bind iterator, context if context
    155     return obj.reduce iterator, memo
    156   _.each obj, (value, index, list) ->
    157     memo = iterator.call context, memo, value, index, list
    158   memo
    159 
    160 
    161 # The right-associative version of **reduce**, also known as **foldr**. Uses
    162 # JavaScript 1.8's version of **reduceRight**, if available.
    163 _.reduceRight = (obj, iterator, memo, context) ->
    164   if nativeReduceRight and obj.reduceRight is nativeReduceRight
    165     iterator = _.bind iterator, context if context
    166     return obj.reduceRight iterator, memo
    167   reversed = _.clone(_.toArray(obj)).reverse()
    168   _.reduce reversed, iterator, memo, context
    169 
    170 
    171 # Return the first value which passes a truth test.
    172 _.detect = (obj, iterator, context) ->
    173   result = null
    174   _.each obj, (value, index, list) ->
    175     if iterator.call context, value, index, list
    176       result = value
    177       _.breakLoop()
    178   result
    179 
    180 
    181 # Return all the elements that pass a truth test. Use JavaScript 1.6's
    182 # **filter**, if it exists.
    183 _.filter = (obj, iterator, context) ->
    184   return obj.filter iterator, context if nativeFilter and obj.filter is nativeFilter
    185   results = []
    186   _.each obj, (value, index, list) ->
    187     results.push value if iterator.call context, value, index, list
    188   results
    189 
    190 
    191 # Return all the elements for which a truth test fails.
    192 _.reject = (obj, iterator, context) ->
    193   results = []
    194   _.each obj, (value, index, list) ->
    195     results.push value if not iterator.call context, value, index, list
    196   results
    197 
    198 
    199 # Determine whether all of the elements match a truth test. Delegate to
    200 # JavaScript 1.6's **every**, if it is present.
    201 _.every = (obj, iterator, context) ->
    202   iterator ||= _.identity
    203   return obj.every iterator, context if nativeEvery and obj.every is nativeEvery
    204   result = true
    205   _.each obj, (value, index, list) ->
    206     _.breakLoop() unless (result = result and iterator.call(context, value, index, list))
    207   result
    208 
    209 
    210 # Determine if at least one element in the object matches a truth test. Use
    211 # JavaScript 1.6's **some**, if it exists.
    212 _.some = (obj, iterator, context) ->
    213   iterator ||= _.identity
    214   return obj.some iterator, context if nativeSome and obj.some is nativeSome
    215   result = false
    216   _.each obj, (value, index, list) ->
    217     _.breakLoop() if (result = iterator.call(context, value, index, list))
    218   result
    219 
    220 
    221 # Determine if a given value is included in the array or object,
    222 # based on `===`.
    223 _.include = (obj, target) ->
    224   return _.indexOf(obj, target) isnt -1 if nativeIndexOf and obj.indexOf is nativeIndexOf
    225   return true for own key, val of obj when val is target
    226   false
    227 
    228 
    229 # Invoke a method with arguments on every item in a collection.
    230 _.invoke = (obj, method) ->
    231   args = _.rest arguments, 2
    232   (if method then val[method] else val).apply(val, args) for val in obj
    233 
    234 
    235 # Convenience version of a common use case of **map**: fetching a property.
    236 _.pluck = (obj, key) ->
    237   _.map(obj, (val) -> val[key])
    238 
    239 
    240 # Return the maximum item or (item-based computation).
    241 _.max = (obj, iterator, context) ->
    242   return Math.max.apply(Math, obj) if not iterator and _.isArray(obj)
    243   result = computed: -Infinity
    244   _.each obj, (value, index, list) ->
    245     computed = if iterator then iterator.call(context, value, index, list) else value
    246     computed >= result.computed and (result = {value: value, computed: computed})
    247   result.value
    248 
    249 
    250 # Return the minimum element (or element-based computation).
    251 _.min = (obj, iterator, context) ->
    252   return Math.min.apply(Math, obj) if not iterator and _.isArray(obj)
    253   result = computed: Infinity
    254   _.each obj, (value, index, list) ->
    255     computed = if iterator then iterator.call(context, value, index, list) else value
    256     computed < result.computed and (result = {value: value, computed: computed})
    257   result.value
    258 
    259 
    260 # Sort the object's values by a criterion produced by an iterator.
    261 _.sortBy = (obj, iterator, context) ->
    262   _.pluck(((_.map obj, (value, index, list) ->
    263     {value: value, criteria: iterator.call(context, value, index, list)}
    264   ).sort((left, right) ->
    265     a = left.criteria; b = right.criteria
    266     if a < b then -1 else if a > b then 1 else 0
    267   )), 'value')
    268 
    269 
    270 # Use a comparator function to figure out at what index an object should
    271 # be inserted so as to maintain order. Uses binary search.
    272 _.sortedIndex = (array, obj, iterator) ->
    273   iterator ||= _.identity
    274   low = 0
    275   high = array.length
    276   while low < high
    277     mid = (low + high) >> 1
    278     if iterator(array[mid]) < iterator(obj) then low = mid + 1 else high = mid
    279   low
    280 
    281 
    282 # Convert anything iterable into a real, live array.
    283 _.toArray = (iterable) ->
    284   return [] if (!iterable)
    285   return iterable.toArray() if (iterable.toArray)
    286   return iterable if (_.isArray(iterable))
    287   return slice.call(iterable) if (_.isArguments(iterable))
    288   _.values(iterable)
    289 
    290 
    291 # Return the number of elements in an object.
    292 _.size = (obj) -> _.toArray(obj).length
    293 
    294 
    295 # Array Functions
    296 # ---------------
    297 
    298 # Get the first element of an array. Passing `n` will return the first N
    299 # values in the array. Aliased as **head**. The `guard` check allows it to work
    300 # with **map**.
    301 _.first = (array, n, guard) ->
    302   if n and not guard then slice.call(array, 0, n) else array[0]
    303 
    304 
    305 # Returns everything but the first entry of the array. Aliased as **tail**.
    306 # Especially useful on the arguments object. Passing an `index` will return
    307 # the rest of the values in the array from that index onward. The `guard`
    308 # check allows it to work with **map**.
    309 _.rest = (array, index, guard) ->
    310   slice.call(array, if _.isUndefined(index) or guard then 1 else index)
    311 
    312 
    313 # Get the last element of an array.
    314 _.last = (array) -> array[array.length - 1]
    315 
    316 
    317 # Trim out all falsy values from an array.
    318 _.compact = (array) -> item for item in array when item
    319 
    320 
    321 # Return a completely flattened version of an array.
    322 _.flatten = (array) ->
    323   _.reduce array, (memo, value) ->
    324     return memo.concat(_.flatten(value)) if _.isArray value
    325     memo.push value
    326     memo
    327   , []
    328 
    329 
    330 # Return a version of the array that does not contain the specified value(s).
    331 _.without = (array) ->
    332   values = _.rest arguments
    333   val for val in _.toArray(array) when not _.include values, val
    334 
    335 
    336 # Produce a duplicate-free version of the array. If the array has already
    337 # been sorted, you have the option of using a faster algorithm.
    338 _.uniq = (array, isSorted) ->
    339   memo = []
    340   for el, i in _.toArray array
    341     memo.push el if i is 0 || (if isSorted is true then _.last(memo) isnt el else not _.include(memo, el))
    342   memo
    343 
    344 
    345 # Produce an array that contains every item shared between all the
    346 # passed-in arrays.
    347 _.intersect = (array) ->
    348   rest = _.rest arguments
    349   _.select _.uniq(array), (item) ->
    350     _.all rest, (other) ->
    351       _.indexOf(other, item) >= 0
    352 
    353 
    354 # Zip together multiple lists into a single array -- elements that share
    355 # an index go together.
    356 _.zip = ->
    357   length = _.max _.pluck arguments, 'length'
    358   results = new Array length
    359   for i in [0...length]
    360     results[i] = _.pluck arguments, String i
    361   results
    362 
    363 
    364 # If the browser doesn't supply us with **indexOf** (I'm looking at you, MSIE),
    365 # we need this function. Return the position of the first occurrence of an
    366 # item in an array, or -1 if the item is not included in the array.
    367 _.indexOf = (array, item) ->
    368   return array.indexOf item if nativeIndexOf and array.indexOf is nativeIndexOf
    369   i = 0; l = array.length
    370   while l - i
    371     if array[i] is item then return i else i++
    372   -1
    373 
    374 
    375 # Provide JavaScript 1.6's **lastIndexOf**, delegating to the native function,
    376 # if possible.
    377 _.lastIndexOf = (array, item) ->
    378   return array.lastIndexOf(item) if nativeLastIndexOf and array.lastIndexOf is nativeLastIndexOf
    379   i = array.length
    380   while i
    381     if array[i] is item then return i else i--
    382   -1
    383 
    384 
    385 # Generate an integer Array containing an arithmetic progression. A port of
    386 # [the native Python **range** function](http://docs.python.org/library/functions.html#range).
    387 _.range = (start, stop, step) ->
    388   a = arguments
    389   solo = a.length <= 1
    390   i = start = if solo then 0 else a[0]
    391   stop = if solo then a[0] else a[1]
    392   step = a[2] or 1
    393   len = Math.ceil((stop - start) / step)
    394   return [] if len <= 0
    395   range = new Array len
    396   idx = 0
    397   loop
    398     return range if (if step > 0 then i - stop else stop - i) >= 0
    399     range[idx] = i
    400     idx++
    401     i+= step
    402 
    403 
    404 # Function Functions
    405 # ------------------
    406 
    407 # Create a function bound to a given object (assigning `this`, and arguments,
    408 # optionally). Binding with arguments is also known as **curry**.
    409 _.bind = (func, obj) ->
    410   args = _.rest arguments, 2
    411   -> func.apply obj or root, args.concat arguments
    412 
    413 
    414 # Bind all of an object's methods to that object. Useful for ensuring that
    415 # all callbacks defined on an object belong to it.
    416 _.bindAll = (obj) ->
    417   funcs = if arguments.length > 1 then _.rest(arguments) else _.functions(obj)
    418   _.each funcs, (f) -> obj[f] = _.bind obj[f], obj
    419   obj
    420 
    421 
    422 # Delays a function for the given number of milliseconds, and then calls
    423 # it with the arguments supplied.
    424 _.delay = (func, wait) ->
    425   args = _.rest arguments, 2
    426   setTimeout((-> func.apply(func, args)), wait)
    427 
    428 
    429 # Memoize an expensive function by storing its results.
    430 _.memoize = (func, hasher) ->
    431   memo = {}
    432   hasher or= _.identity
    433   ->
    434     key = hasher.apply this, arguments
    435     return memo[key] if key of memo
    436     memo[key] = func.apply this, arguments
    437 
    438 
    439 # Defers a function, scheduling it to run after the current call stack has
    440 # cleared.
    441 _.defer = (func) ->
    442   _.delay.apply _, [func, 1].concat _.rest arguments
    443 
    444 
    445 # Returns the first function passed as an argument to the second,
    446 # allowing you to adjust arguments, run code before and after, and
    447 # conditionally execute the original function.
    448 _.wrap = (func, wrapper) ->
    449   -> wrapper.apply wrapper, [func].concat arguments
    450 
    451 
    452 # Returns a function that is the composition of a list of functions, each
    453 # consuming the return value of the function that follows.
    454 _.compose = ->
    455   funcs = arguments
    456   ->
    457     args = arguments
    458     for i in [funcs.length - 1..0] by -1
    459       args = [funcs[i].apply(this, args)]
    460     args[0]
    461 
    462 
    463 # Object Functions
    464 # ----------------
    465 
    466 # Retrieve the names of an object's properties.
    467 _.keys = nativeKeys or (obj) ->
    468   return _.range 0, obj.length if _.isArray(obj)
    469   key for key, val of obj
    470 
    471 
    472 # Retrieve the values of an object's properties.
    473 _.values = (obj) ->
    474   _.map obj, _.identity
    475 
    476 
    477 # Return a sorted list of the function names available in Underscore.
    478 _.functions = (obj) ->
    479   _.filter(_.keys(obj), (key) -> _.isFunction(obj[key])).sort()
    480 
    481 
    482 # Extend a given object with all of the properties in a source object.
    483 _.extend = (obj) ->
    484   for source in _.rest(arguments)
    485     obj[key] = val for key, val of source
    486   obj
    487 
    488 
    489 # Create a (shallow-cloned) duplicate of an object.
    490 _.clone = (obj) ->
    491   return obj.slice 0 if _.isArray obj
    492   _.extend {}, obj
    493 
    494 
    495 # Invokes interceptor with the obj, and then returns obj.
    496 # The primary purpose of this method is to "tap into" a method chain,
    497 # in order to perform operations on intermediate results within
    498  the chain.
    499 _.tap = (obj, interceptor) ->
    500   interceptor obj
    501   obj
    502 
    503 
    504 # Perform a deep comparison to check if two objects are equal.
    505 _.isEqual = (a, b) ->
    506   # Check object identity.
    507   return true if a is b
    508   # Different types?
    509   atype = typeof(a); btype = typeof(b)
    510   return false if atype isnt btype
    511   # Basic equality test (watch out for coercions).
    512   return true if `a == b`
    513   # One is falsy and the other truthy.
    514   return false if (!a and b) or (a and !b)
    515   # One of them implements an `isEqual()`?
    516   return a.isEqual(b) if a.isEqual
    517   # Check dates' integer values.
    518   return a.getTime() is b.getTime() if _.isDate(a) and _.isDate(b)
    519   # Both are NaN?
    520   return false if _.isNaN(a) and _.isNaN(b)
    521   # Compare regular expressions.
    522   if _.isRegExp(a) and _.isRegExp(b)
    523     return a.source is b.source and
    524            a.global is b.global and
    525            a.ignoreCase is b.ignoreCase and
    526            a.multiline is b.multiline
    527   # If a is not an object by this point, we can't handle it.
    528   return false if atype isnt 'object'
    529   # Check for different array lengths before comparing contents.
    530   return false if a.length and (a.length isnt b.length)
    531   # Nothing else worked, deep compare the contents.
    532   aKeys = _.keys(a); bKeys = _.keys(b)
    533   # Different object sizes?
    534   return false if aKeys.length isnt bKeys.length
    535   # Recursive comparison of contents.
    536   return false for key, val of a when !(key of b) or !_.isEqual(val, b[key])
    537   true
    538 
    539 
    540 # Is a given array or object empty?
    541 _.isEmpty = (obj) ->
    542   return obj.length is 0 if _.isArray(obj) or _.isString(obj)
    543   return false for own key of obj
    544   true
    545 
    546 
    547 # Is a given value a DOM element?
    548 _.isElement = (obj) -> obj and obj.nodeType is 1
    549 
    550 
    551 # Is a given value an array?
    552 _.isArray = nativeIsArray or (obj) -> !!(obj and obj.concat and obj.unshift and not obj.callee)
    553 
    554 
    555 # Is a given variable an arguments object?
    556 _.isArguments = (obj) -> obj and obj.callee
    557 
    558 
    559 # Is the given value a function?
    560 _.isFunction = (obj) -> !!(obj and obj.constructor and obj.call and obj.apply)
    561 
    562 
    563 # Is the given value a string?
    564 _.isString = (obj) -> !!(obj is '' or (obj and obj.charCodeAt and obj.substr))
    565 
    566 
    567 # Is a given value a number?
    568 _.isNumber = (obj) -> (obj is +obj) or toString.call(obj) is '[object Number]'
    569 
    570 
    571 # Is a given value a boolean?
    572 _.isBoolean = (obj) -> obj is true or obj is false
    573 
    574 
    575 # Is a given value a Date?
    576 _.isDate = (obj) -> !!(obj and obj.getTimezoneOffset and obj.setUTCFullYear)
    577 
    578 
    579 # Is the given value a regular expression?
    580 _.isRegExp = (obj) -> !!(obj and obj.exec and (obj.ignoreCase or obj.ignoreCase is false))
    581 
    582 
    583 # Is the given value NaN -- this one is interesting. `NaN != NaN`, and
    584 # `isNaN(undefined) == true`, so we make sure it's a number first.
    585 _.isNaN = (obj) -> _.isNumber(obj) and window.isNaN(obj)
    586 
    587 
    588 # Is a given value equal to null?
    589 _.isNull = (obj) -> obj is null
    590 
    591 
    592 # Is a given variable undefined?
    593 _.isUndefined = (obj) -> typeof obj is 'undefined'
    594 
    595 
    596 # Utility Functions
    597 # -----------------
    598 
    599 # Run Underscore.js in noConflict mode, returning the `_` variable to its
    600 # previous owner. Returns a reference to the Underscore object.
    601 _.noConflict = ->
    602   root._ = previousUnderscore
    603   this
    604 
    605 
    606 # Keep the identity function around for default iterators.
    607 _.identity = (value) -> value
    608 
    609 
    610 # Run a function `n` times.
    611 _.times = (n, iterator, context) ->
    612   iterator.call context, i for i in [0...n]
    613 
    614 
    615 # Break out of the middle of an iteration.
    616 _.breakLoop = -> throw breaker
    617 
    618 
    619 # Add your own custom functions to the Underscore object, ensuring that
    620 # they're correctly added to the OOP wrapper as well.
    621 _.mixin = (obj) ->
    622   for name in _.functions(obj)
    623     addToWrapper name, _[name] = obj[name]
    624 
    625 
    626 # Generate a unique integer id (unique within the entire client session).
    627 # Useful for temporary DOM ids.
    628 idCounter = 0
    629 _.uniqueId = (prefix) ->
    630   (prefix or '') + idCounter++
    631 
    632 
    633 # By default, Underscore uses **ERB**-style template delimiters, change the
    634 # following template settings to use alternative delimiters.
    635 _.templateSettings = {
    636   start: '<%'
    637   end: '%>'
    638   interpolate: /<%=(.+?)%>/g
    639 }
    640 
    641 
    642 # JavaScript templating a-la **ERB**, pilfered from John Resig's
    643 # *Secrets of the JavaScript Ninja*, page 83.
    644 # Single-quote fix from Rick Strahl.
    645 # With alterations for arbitrary delimiters, and to preserve whitespace.
    646 _.template = (str, data) ->
    647   c = _.templateSettings
    648   endMatch = new RegExp("'(?=[^"+c.end.substr(0, 1)+"]*"+escapeRegExp(c.end)+")","g")
    649   fn = new Function 'obj',
    650     'var p=[],print=function(){p.push.apply(p,arguments);};' +
    651     'with(obj||{}){p.push(\'' +
    652     str.replace(/\r/g, '\\r')
    653        .replace(/\n/g, '\\n')
    654        .replace(/\t/g, '\\t')
    655        .replace(endMatch,"���")
    656        .split("'").join("\\'")
    657        .split("���").join("'")
    658        .replace(c.interpolate, "',$1,'")
    659        .split(c.start).join("');")
    660        .split(c.end).join("p.push('") +
    661        "');}return p.join('');"
    662   if data then fn(data) else fn
    663 
    664 
    665 # Aliases
    666 # -------
    667 
    668 _.forEach = _.each
    669 _.foldl = _.inject = _.reduce
    670 _.foldr = _.reduceRight
    671 _.select = _.filter
    672 _.all = _.every
    673 _.any = _.some
    674 _.contains = _.include
    675 _.head = _.first
    676 _.tail = _.rest
    677 _.methods = _.functions
    678 
    679 
    680 # Setup the OOP Wrapper
    681 # ---------------------
    682 
    683 # If Underscore is called as a function, it returns a wrapped object that
    684 # can be used OO-style. This wrapper holds altered versions of all the
    685 # underscore functions. Wrapped objects may be chained.
    686 wrapper = (obj) ->
    687   this._wrapped = obj
    688   this
    689 
    690 
    691 # Helper function to continue chaining intermediate results.
    692 result = (obj, chain) ->
    693   if chain then _(obj).chain() else obj
    694 
    695 
    696 # A method to easily add functions to the OOP wrapper.
    697 addToWrapper = (name, func) ->
    698   wrapper.prototype[name] = ->
    699     args = _.toArray arguments
    700     unshift.call args, this._wrapped
    701     result func.apply(_, args), this._chain
    702 
    703 
    704 # Add all ofthe Underscore functions to the wrapper object.
    705 _.mixin _
    706 
    707 
    708 # Add all mutator Array functions to the wrapper.
    709 _.each ['pop', 'push', 'reverse', 'shift', 'sort', 'splice', 'unshift'], (name) ->
    710   method = Array.prototype[name]
    711   wrapper.prototype[name] = ->
    712     method.apply(this._wrapped, arguments)
    713     result(this._wrapped, this._chain)
    714 
    715 
    716 # Add all accessor Array functions to the wrapper.
    717 _.each ['concat', 'join', 'slice'], (name) ->
    718   method = Array.prototype[name]
    719   wrapper.prototype[name] = ->
    720     result(method.apply(this._wrapped, arguments), this._chain)
    721 
    722 
    723 # Start chaining a wrapped Underscore object.
    724 wrapper::chain = ->
    725   this._chain = true
    726   this
    727 
    728 
    729 # Extracts the result from a wrapped and chained object.
    730 wrapper::value = -> this._wrapped
    731 </textarea></form>
    732     <script>
    733       var editor = CodeMirror.fromTextArea(document.getElementById("code"), {});
    734     </script>
    735 
    736     <p><strong>MIME types defined:</strong> <code>application/vnd.coffeescript</code>, <code>text/coffeescript</code>, <code>text/x-coffeescript</code>.</p>
    737 
    738     <p>The CoffeeScript mode was written by Jeff Pickhardt.</p>
    739 
    740   </article>