2010-01-05 03:51:02 +00:00
|
|
|
|
|
|
|
# Underscore.coffee
|
|
|
|
# (c) 2009 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
|
|
|
|
|
|
|
|
|
2010-01-10 20:52:23 +00:00
|
|
|
# Create a safe reference to the Underscore object forreference below.
|
2010-01-05 03:51:02 +00:00
|
|
|
_: 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.prototype.slice
|
|
|
|
unshift: Array.prototype.unshift
|
|
|
|
toString: Object.prototype.toString
|
|
|
|
hasOwnProperty: Object.prototype.hasOwnProperty
|
|
|
|
propertyIsEnumerable: Object.prototype.propertyIsEnumerable
|
|
|
|
|
|
|
|
|
|
|
|
# Current version.
|
|
|
|
_.VERSION: '0.5.3'
|
|
|
|
|
|
|
|
|
|
|
|
# ------------------------ 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]
|
2010-01-10 20:52:23 +00:00
|
|
|
iterator.call(context, val, key, obj) for key, val ino obj
|
2010-01-05 03:51:02 +00:00
|
|
|
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)
|
2010-01-10 20:52:23 +00:00
|
|
|
for key, val ino obj
|
2010-01-05 03:51:02 +00:00
|
|
|
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))
|
2010-01-04 03:25:38 +00:00
|
|
|
memo
|
|
|
|
|
2010-01-05 03:51:02 +00:00
|
|
|
|
|
|
|
# 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: =>
|
|
|
|
args: _.toArray(arguments)
|
|
|
|
length: _.max(_.pluck(args, 'length'))
|
|
|
|
results: new Array(length)
|
|
|
|
for i in [0...length]
|
|
|
|
results[i]: _.pluck(args, 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: _.toArray(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(_.toArray(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(_.toArray(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: _.toArray(arguments)
|
|
|
|
=>
|
|
|
|
args: _.toArray(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)
|
2010-01-10 20:52:23 +00:00
|
|
|
key for key, val ino obj
|
2010-01-05 03:51:02 +00:00
|
|
|
|
|
|
|
|
|
|
|
# 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 =>
|
2010-01-10 20:52:23 +00:00
|
|
|
for key, val ino source
|
2010-01-05 03:51:02 +00:00
|
|
|
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 !_.isArray(obj) and !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 => 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++
|
|
|
|
|
|
|
|
|
|
|
|
# JavaScript templating a-la ERB, pilfered from John Resig's
|
|
|
|
# "Secrets of the JavaScript Ninja", page 83.
|
|
|
|
_.template: str, data =>
|
|
|
|
`var fn = new Function('obj',
|
|
|
|
'var p=[],print=function(){p.push.apply(p,arguments);};' +
|
|
|
|
'with(obj){p.push(\'' +
|
|
|
|
str.
|
|
|
|
replace(/[\r\t\n]/g, " ").
|
|
|
|
split("<%").join("\t").
|
|
|
|
replace(/((^|%>)[^\t]*)'/g, "$1\r").
|
|
|
|
replace(/\t=(.*?)%>/g, "',$1,'").
|
|
|
|
split("\t").join("');").
|
|
|
|
split("%>").join("p.push('").
|
|
|
|
split("\r").join("\\'") +
|
|
|
|
"');}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]: =>
|
2010-01-10 20:52:23 +00:00
|
|
|
args: _.toArray(arguments)
|
|
|
|
unshift.call(args, this._wrapped)
|
|
|
|
result(method.apply(_, args), this._chain)
|
2010-01-05 03:51:02 +00:00
|
|
|
|
|
|
|
|
|
|
|
# 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.prototype.chain: =>
|
|
|
|
this._chain: true
|
|
|
|
this
|
|
|
|
|
|
|
|
|
|
|
|
# Extracts the result from a wrapped and chained object.
|
|
|
|
wrapper.prototype.value: => this._wrapped
|