util.coffee

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util.coffee
¶

Look what you make me do Javascript
```
slice = Array::slice
```

DOM simplifier (no jQuery dependency) NodeJS compatible

$ = (sel, root = document) ->
  return sel if typeof sel is "object" or exports?
  root.querySelector sel

class Util

Unique value utility

  @uniqid = do ->
    id = 0
    get: -> id++

Helper function that extends one object with all the properies of other objects

  @extend = (obj, src...) ->
    dest = obj

    for copy in src
      for own prop of copy
        dest[prop] = copy[prop]

    return dest

In order to stay true to the latest spec, RGB values must be clamped between 0 and 255. If we don't do this, weird things happen.

  @clampRGB = (val) ->
    switch val >> 8
      when 0 then val
      when -1 then 0
      when 1 then 255

  @copyAttributes: (from, to, opts={}) ->
    for attr in from.attributes
      continue if opts.except? and attr.nodeName in opts.except
      to.setAttribute(attr.nodeName, attr.nodeValue)

Support for browsers that don't know Uint8Array (such as IE9)

  @dataArray: (length = 0) ->
    return new Uint8Array(length) if Caman.NodeJS or window.Uint8Array?
    return new Array(length)