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-
- # Underscore.coffee
- # (c) 2010 Jeremy Ashkenas, DocumentCloud Inc.
- # Underscore is freely distributable under the terms of the MIT license.
- # Portions of Underscore are inspired by or borrowed from Prototype.js,
- # Oliver Steele's Functional, and John Resig's Micro-Templating.
- # For all details and documentation:
- # http://documentcloud.github.com/underscore/
-
-
- # ------------------------- Baseline setup ---------------------------------
-
- # Establish the root object, "window" in the browser, or "global" on the server.
- root: this
-
-
- # Save the previous value of the "_" variable.
- previousUnderscore: root._
-
-
- # If Underscore is called as a function, it returns a wrapped object that
- # can be used OO-style. This wrapper holds altered versions of all the
- # underscore functions. Wrapped objects may be chained.
- wrapper: (obj) ->
- this._wrapped: obj
- this
-
-
- # Establish the object that gets thrown to break out of a loop iteration.
- breaker: if typeof(StopIteration) is 'undefined' then '__break__' else StopIteration
-
-
- # Create a safe reference to the Underscore object forreference below.
- _: root._: (obj) -> new wrapper(obj)
-
-
- # Export the Underscore object for CommonJS.
- if typeof(exports) != 'undefined' then exports._: _
-
-
- # Create quick reference variables for speed access to core prototypes.
- slice: Array::slice
- unshift: Array::unshift
- toString: Object::toString
- hasOwnProperty: Object::hasOwnProperty
- propertyIsEnumerable: Object::propertyIsEnumerable
-
-
- # Current version.
- _.VERSION: '0.5.7'
-
-
- # ------------------------ Collection Functions: ---------------------------
-
- # The cornerstone, an each implementation.
- # Handles objects implementing forEach, arrays, and raw objects.
- _.each: (obj, iterator, context) ->
- index: 0
- try
- return obj.forEach(iterator, context) if obj.forEach
- if _.isArray(obj) or _.isArguments(obj)
- return iterator.call(context, obj[i], i, obj) for i in [0...obj.length]
- iterator.call(context, val, key, obj) for key, val of obj
- catch e
- throw e if e isnt breaker
- obj
-
-
- # Return the results of applying the iterator to each element. Use JavaScript
- # 1.6's version of map, if possible.
- _.map: (obj, iterator, context) ->
- return obj.map(iterator, context) if (obj and _.isFunction(obj.map))
- results: []
- _.each obj, (value, index, list) ->
- results.push(iterator.call(context, value, index, list))
- results
-
-
- # Reduce builds up a single result from a list of values. Also known as
- # inject, or foldl. Uses JavaScript 1.8's version of reduce, if possible.
- _.reduce: (obj, memo, iterator, context) ->
- return obj.reduce(_.bind(iterator, context), memo) if (obj and _.isFunction(obj.reduce))
- _.each obj, (value, index, list) ->
- memo: iterator.call(context, memo, value, index, list)
- memo
-
-
- # The right-associative version of reduce, also known as foldr. Uses
- # JavaScript 1.8's version of reduceRight, if available.
- _.reduceRight: (obj, memo, iterator, context) ->
- return obj.reduceRight(_.bind(iterator, context), memo) if (obj and _.isFunction(obj.reduceRight))
- _.each _.clone(_.toArray(obj)).reverse(), (value, index) ->
- memo: iterator.call(context, memo, value, index, obj)
- memo
-
-
- # Return the first value which passes a truth test.
- _.detect: (obj, iterator, context) ->
- result: null
- _.each obj, (value, index, list) ->
- if iterator.call(context, value, index, list)
- result: value
- _.breakLoop()
- result
-
-
- # Return all the elements that pass a truth test. Use JavaScript 1.6's
- # filter(), if it exists.
- _.select: (obj, iterator, context) ->
- if obj and _.isFunction(obj.filter) then return obj.filter(iterator, context)
- results: []
- _.each obj, (value, index, list) ->
- results.push(value) if iterator.call(context, value, index, list)
- results
-
-
- # Return all the elements for which a truth test fails.
- _.reject: (obj, iterator, context) ->
- results: []
- _.each obj, (value, index, list) ->
- results.push(value) if not iterator.call(context, value, index, list)
- results
-
-
- # Determine whether all of the elements match a truth test. Delegate to
- # JavaScript 1.6's every(), if it is present.
- _.all: (obj, iterator, context) ->
- iterator ||= _.identity
- return obj.every(iterator, context) if obj and _.isFunction(obj.every)
- result: true
- _.each obj, (value, index, list) ->
- _.breakLoop() unless (result: result and iterator.call(context, value, index, list))
- result
-
-
- # Determine if at least one element in the object matches a truth test. Use
- # JavaScript 1.6's some(), if it exists.
- _.any: (obj, iterator, context) ->
- iterator ||= _.identity
- return obj.some(iterator, context) if obj and _.isFunction(obj.some)
- result: false
- _.each obj, (value, index, list) ->
- _.breakLoop() if (result: iterator.call(context, value, index, list))
- result
-
-
- # Determine if a given value is included in the array or object,
- # based on '==='.
- _.include: (obj, target) ->
- return _.indexOf(obj, target) isnt -1 if _.isArray(obj)
- for key, val of obj
- return true if val is target
- false
-
-
- # Invoke a method with arguments on every item in a collection.
- _.invoke: (obj, method) ->
- args: _.rest(arguments, 2)
- (if method then val[method] else val).apply(val, args) for val in obj
-
-
- # Convenience version of a common use case of map: fetching a property.
- _.pluck: (obj, key) ->
- _.map(obj, ((val) -> val[key]))
-
-
- # Return the maximum item or (item-based computation).
- _.max: (obj, iterator, context) ->
- return Math.max.apply(Math, obj) if not iterator and _.isArray(obj)
- result: {computed: -Infinity}
- _.each obj, (value, index, list) ->
- computed: if iterator then iterator.call(context, value, index, list) else value
- computed >= result.computed and (result: {value: value, computed: computed})
- result.value
-
-
- # Return the minimum element (or element-based computation).
- _.min: (obj, iterator, context) ->
- return Math.min.apply(Math, obj) if not iterator and _.isArray(obj)
- result: {computed: Infinity}
- _.each obj, (value, index, list) ->
- computed: if iterator then iterator.call(context, value, index, list) else value
- computed < result.computed and (result: {value: value, computed: computed})
- result.value
-
-
- # Sort the object's values by a criteria produced by an iterator.
- _.sortBy: (obj, iterator, context) ->
- _.pluck(((_.map obj, (value, index, list) ->
- {value: value, criteria: iterator.call(context, value, index, list)}
- ).sort((left, right) ->
- a: left.criteria; b: right.criteria
- if a < b then -1 else if a > b then 1 else 0
- )), 'value')
-
-
- # Use a comparator function to figure out at what index an object should
- # be inserted so as to maintain order. Uses binary search.
- _.sortedIndex: (array, obj, iterator) ->
- iterator ||= _.identity
- low: 0; high: array.length
- while low < high
- mid: (low + high) >> 1
- if iterator(array[mid]) < iterator(obj) then low: mid + 1 else high: mid
- low
-
-
- # Convert anything iterable into a real, live array.
- _.toArray: (iterable) ->
- return [] if (!iterable)
- return iterable.toArray() if (iterable.toArray)
- return iterable if (_.isArray(iterable))
- return slice.call(iterable) if (_.isArguments(iterable))
- _.values(iterable)
-
-
- # Return the number of elements in an object.
- _.size: (obj) -> _.toArray(obj).length
-
-
- # -------------------------- Array Functions: ------------------------------
-
- # Get the first element of an array. Passing "n" will return the first N
- # values in the array. Aliased as "head". The "guard" check allows it to work
- # with _.map.
- _.first: (array, n, guard) ->
- if n and not guard then slice.call(array, 0, n) else array[0]
-
-
- # Returns everything but the first entry of the array. Aliased as "tail".
- # Especially useful on the arguments object. Passing an "index" will return
- # the rest of the values in the array from that index onward. The "guard"
- # check allows it to work with _.map.
- _.rest: (array, index, guard) ->
- slice.call(array, if _.isUndefined(index) or guard then 1 else index)
-
-
- # Get the last element of an array.
- _.last: (array) -> array[array.length - 1]
-
-
- # Trim out all falsy values from an array.
- _.compact: (array) -> array[i] for i in [0...array.length] when array[i]
-
-
- # Return a completely flattened version of an array.
- _.flatten: (array) ->
- _.reduce array, [], (memo, value) ->
- return memo.concat(_.flatten(value)) if _.isArray(value)
- memo.push(value)
- memo
-
-
- # Return a version of the array that does not contain the specified value(s).
- _.without: (array) ->
- values: _.rest(arguments)
- val for val in _.toArray(array) when not _.include(values, val)
-
-
- # Produce a duplicate-free version of the array. If the array has already
- # been sorted, you have the option of using a faster algorithm.
- _.uniq: (array, isSorted) ->
- memo: []
- for el, i in _.toArray(array)
- memo.push(el) if i is 0 || (if isSorted is true then _.last(memo) isnt el else not _.include(memo, el))
- memo
-
-
- # Produce an array that contains every item shared between all the
- # passed-in arrays.
- _.intersect: (array) ->
- rest: _.rest(arguments)
- _.select _.uniq(array), (item) ->
- _.all rest, (other) ->
- _.indexOf(other, item) >= 0
-
-
- # Zip together multiple lists into a single array -- elements that share
- # an index go together.
- _.zip: ->
- length: _.max(_.pluck(arguments, 'length'))
- results: new Array(length)
- for i in [0...length]
- results[i]: _.pluck(arguments, String(i))
- results
-
-
- # If the browser doesn't supply us with indexOf (I'm looking at you, MSIE),
- # we need this function. Return the position of the first occurence of an
- # item in an array, or -1 if the item is not included in the array.
- _.indexOf: (array, item) ->
- return array.indexOf(item) if array.indexOf
- i: 0; l: array.length
- while l - i
- if array[i] is item then return i else i++
- -1
-
-
- # Provide JavaScript 1.6's lastIndexOf, delegating to the native function,
- # if possible.
- _.lastIndexOf: (array, item) ->
- return array.lastIndexOf(item) if array.lastIndexOf
- i: array.length
- while i
- if array[i] is item then return i else i--
- -1
-
-
- # Generate an integer Array containing an arithmetic progression. A port of
- # the native Python range() function. See:
- # http://docs.python.org/library/functions.html#range
- _.range: (start, stop, step) ->
- a: arguments
- solo: a.length <= 1
- i: start: if solo then 0 else a[0];
- stop: if solo then a[0] else a[1];
- step: a[2] or 1
- len: Math.ceil((stop - start) / step)
- return [] if len <= 0
- range: new Array(len)
- idx: 0
- while true
- return range if (if step > 0 then i - stop else stop - i) >= 0
- range[idx]: i
- idx++
- i+= step
-
-
- # ----------------------- Function Functions: -----------------------------
-
- # Create a function bound to a given object (assigning 'this', and arguments,
- # optionally). Binding with arguments is also known as 'curry'.
- _.bind: (func, obj) ->
- args: _.rest(arguments, 2)
- -> func.apply(obj or root, args.concat(arguments))
-
-
- # Bind all of an object's methods to that object. Useful for ensuring that
- # all callbacks defined on an object belong to it.
- _.bindAll: (obj) ->
- funcs: if arguments.length > 1 then _.rest(arguments) else _.functions(obj)
- _.each(funcs, (f) -> obj[f]: _.bind(obj[f], obj))
- obj
-
-
- # Delays a function for the given number of milliseconds, and then calls
- # it with the arguments supplied.
- _.delay: (func, wait) ->
- args: _.rest(arguments, 2)
- setTimeout((-> func.apply(func, args)), wait)
-
-
- # Defers a function, scheduling it to run after the current call stack has
- # cleared.
- _.defer: (func) ->
- _.delay.apply(_, [func, 1].concat(_.rest(arguments)))
-
-
- # Returns the first function passed as an argument to the second,
- # allowing you to adjust arguments, run code before and after, and
- # conditionally execute the original function.
- _.wrap: (func, wrapper) ->
- -> wrapper.apply(wrapper, [func].concat(arguments))
-
-
- # Returns a function that is the composition of a list of functions, each
- # consuming the return value of the function that follows.
- _.compose: ->
- funcs: arguments
- ->
- args: arguments
- for i in [(funcs.length - 1)..0]
- args: [funcs[i].apply(this, args)]
- args[0]
-
-
- # ------------------------- Object Functions: ----------------------------
-
- # Retrieve the names of an object's properties.
- _.keys: (obj) ->
- return _.range(0, obj.length) if _.isArray(obj)
- key for key, val of obj
-
-
- # Retrieve the values of an object's properties.
- _.values: (obj) ->
- _.map(obj, _.identity)
-
-
- # Return a sorted list of the function names available in Underscore.
- _.functions: (obj) ->
- _.select(_.keys(obj), (key) -> _.isFunction(obj[key])).sort()
-
-
- # Extend a given object with all of the properties in a source object.
- _.extend: (destination, source) ->
- for key, val of source
- destination[key]: val
- destination
-
-
- # Create a (shallow-cloned) duplicate of an object.
- _.clone: (obj) ->
- return obj.slice(0) if _.isArray(obj)
- _.extend({}, obj)
-
-
- # Invokes interceptor with the obj, and then returns obj.
- # The primary purpose of this method is to "tap into" a method chain, in order to perform operations on intermediate results within the chain.
- _.tap: (obj, interceptor) ->
- interceptor(obj)
- obj
-
-
- # Perform a deep comparison to check if two objects are equal.
- _.isEqual: (a, b) ->
- # Check object identity.
- return true if a is b
- # Different types?
- atype: typeof(a); btype: typeof(b)
- return false if atype isnt btype
- # Basic equality test (watch out for coercions).
- return true if `a == b`
- # One is falsy and the other truthy.
- return false if (!a and b) or (a and !b)
- # One of them implements an isEqual()?
- return a.isEqual(b) if a.isEqual
- # Check dates' integer values.
- return a.getTime() is b.getTime() if _.isDate(a) and _.isDate(b)
- # Both are NaN?
- return true if _.isNaN(a) and _.isNaN(b)
- # Compare regular expressions.
- if _.isRegExp(a) and _.isRegExp(b)
- return a.source is b.source and
- a.global is b.global and
- a.ignoreCase is b.ignoreCase and
- a.multiline is b.multiline
- # If a is not an object by this point, we can't handle it.
- return false if atype isnt 'object'
- # Check for different array lengths before comparing contents.
- return false if a.length and (a.length isnt b.length)
- # Nothing else worked, deep compare the contents.
- aKeys: _.keys(a); bKeys: _.keys(b)
- # Different object sizes?
- return false if aKeys.length isnt bKeys.length
- # Recursive comparison of contents.
- # for (var key in a) if (!_.isEqual(a[key], b[key])) return false;
- return true
-
-
- # Is a given array or object empty?
- _.isEmpty: (obj) -> _.keys(obj).length is 0
-
-
- # Is a given value a DOM element?
- _.isElement: (obj) -> obj and obj.nodeType is 1
-
-
- # Is a given value an array?
- _.isArray: (obj) -> !!(obj and obj.concat and obj.unshift)
-
-
- # Is a given variable an arguments object?
- _.isArguments: (obj) -> obj and _.isNumber(obj.length) and not obj.concat and
- not obj.substr and not obj.apply and not propertyIsEnumerable.call(obj, 'length')
-
-
- # Is the given value a function?
- _.isFunction: (obj) -> !!(obj and obj.constructor and obj.call and obj.apply)
-
-
- # Is the given value a string?
- _.isString: (obj) -> !!(obj is '' or (obj and obj.charCodeAt and obj.substr))
-
-
- # Is a given value a number?
- _.isNumber: (obj) -> (obj is +obj) or toString.call(obj) is '[object Number]'
-
-
- # Is a given value a Date?
- _.isDate: (obj) -> !!(obj and obj.getTimezoneOffset and obj.setUTCFullYear)
-
-
- # Is the given value a regular expression?
- _.isRegExp: (obj) -> !!(obj and obj.exec and (obj.ignoreCase or obj.ignoreCase is false))
-
-
- # Is the given value NaN -- this one is interesting. NaN != NaN, and
- # isNaN(undefined) == true, so we make sure it's a number first.
- _.isNaN: (obj) -> _.isNumber(obj) and window.isNaN(obj)
-
-
- # Is a given value equal to null?
- _.isNull: (obj) -> obj is null
-
-
- # Is a given variable undefined?
- _.isUndefined: (obj) -> typeof obj is 'undefined'
-
-
- # -------------------------- Utility Functions: --------------------------
-
- # Run Underscore.js in noConflict mode, returning the '_' variable to its
- # previous owner. Returns a reference to the Underscore object.
- _.noConflict: ->
- root._: previousUnderscore
- this
-
-
- # Keep the identity function around for default iterators.
- _.identity: (value) -> value
-
-
- # Break out of the middle of an iteration.
- _.breakLoop: -> throw breaker
-
-
- # Generate a unique integer id (unique within the entire client session).
- # Useful for temporary DOM ids.
- idCounter: 0
- _.uniqueId: (prefix) ->
- (prefix or '') + idCounter++
-
-
- # By default, Underscore uses ERB-style template delimiters, change the
- # following template settings to use alternative delimiters.
- _.templateSettings: {
- start: '<%'
- end: '%>'
- interpolate: /<%=(.+?)%>/g
- }
-
-
- # JavaScript templating a-la ERB, pilfered from John Resig's
- # "Secrets of the JavaScript Ninja", page 83.
- # Single-quotea fix from Rick Strahl's version.
- _.template: (str, data) ->
- c: _.templateSettings
- fn: new Function 'obj',
- 'var p=[],print=function(){p.push.apply(p,arguments);};' +
- 'with(obj){p.push(\'' +
- str.replace(/[\r\t\n]/g, " ")
- .replace(new RegExp("'(?=[^"+c.end[0]+"]*"+c.end+")","g"),"\t")
- .split("'").join("\\'")
- .split("\t").join("'")
- .replace(c.interpolate, "',$1,'")
- .split(c.start).join("');")
- .split(c.end).join("p.push('") +
- "');}return p.join('');"
- if data then fn(data) else fn
-
-
- # ------------------------------- Aliases ----------------------------------
-
- _.forEach: _.each
- _.foldl: _.inject: _.reduce
- _.foldr: _.reduceRight
- _.filter: _.select
- _.every: _.all
- _.some: _.any
- _.head: _.first
- _.tail: _.rest
- _.methods: _.functions
-
-
- # /*------------------------ Setup the OOP Wrapper: --------------------------*/
-
- # Helper function to continue chaining intermediate results.
- result: (obj, chain) ->
- if chain then _(obj).chain() else obj
-
-
- # Add all of the Underscore functions to the wrapper object.
- _.each _.functions(_), (name) ->
- method: _[name]
- wrapper.prototype[name]: ->
- unshift.call(arguments, this._wrapped)
- result(method.apply(_, arguments), this._chain)
-
-
- # Add all mutator Array functions to the wrapper.
- _.each ['pop', 'push', 'reverse', 'shift', 'sort', 'splice', 'unshift'], (name) ->
- method: Array.prototype[name]
- wrapper.prototype[name]: ->
- method.apply(this._wrapped, arguments)
- result(this._wrapped, this._chain)
-
-
- # Add all accessor Array functions to the wrapper.
- _.each ['concat', 'join', 'slice'], (name) ->
- method: Array.prototype[name]
- wrapper.prototype[name]: ->
- result(method.apply(this._wrapped, arguments), this._chain)
-
-
- # Start chaining a wrapped Underscore object.
- wrapper::chain: ->
- this._chain: true
- this
-
-
- # Extracts the result from a wrapped and chained object.
- wrapper::value: -> this._wrapped
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