--- /dev/null
+{getOuterSize, getBounds, getSize, extend, updateClasses, defer} = @Tether.Utils
+
+MIRROR_ATTACH =
+ left: 'right'
+ right: 'left'
+ top: 'bottom'
+ bottom: 'top'
+ middle: 'middle'
+
+BOUNDS_FORMAT = ['left', 'top', 'right', 'bottom']
+
+getBoundingRect = (tether, to) ->
+ if to is 'scrollParent'
+ to = tether.scrollParent
+ else if to is 'window'
+ to = [pageXOffset, pageYOffset, innerWidth + pageXOffset, innerHeight + pageYOffset]
+
+ if to is document
+ to = to.documentElement
+
+ if to.nodeType?
+ pos = size = getBounds to
+ style = getComputedStyle to
+
+ to = [pos.left, pos.top, size.width + pos.left, size.height + pos.top]
+
+ for side, i in BOUNDS_FORMAT
+ side = side[0].toUpperCase() + side.substr(1)
+ if side in ['Top', 'Left']
+ to[i] += parseFloat style["border#{ side }Width"]
+ else
+ to[i] -= parseFloat style["border#{ side }Width"]
+
+ to
+
+@Tether.modules.push
+ position: ({top, left, targetAttachment}) ->
+ return true unless @options.constraints
+
+ removeClass = (prefix) =>
+ @removeClass prefix
+ for side in BOUNDS_FORMAT
+ @removeClass "#{ prefix }-#{ side }"
+
+ {height, width} = @cache 'element-bounds', => getBounds @element
+
+ if width is 0 and height is 0 and @lastSize?
+ # Handle the item getting hidden as a result of our positioning without glitching
+ # the classes in and out
+ {width, height} = @lastSize
+
+ targetSize = @cache 'target-bounds', => @getTargetBounds()
+ targetHeight = targetSize.height
+ targetWidth = targetSize.width
+
+ tAttachment = {}
+ eAttachment = {}
+
+ allClasses = [@getClass('pinned'), @getClass('out-of-bounds')]
+ for constraint in @options.constraints
+ allClasses.push(constraint.outOfBoundsClass) if constraint.outOfBoundsClass
+ allClasses.push(constraint.pinnedClass) if constraint.pinnedClass
+
+ for cls in allClasses
+ for side in ['left', 'top', 'right', 'bottom']
+ allClasses.push "#{ cls }-#{ side }"
+
+ addClasses = []
+
+ tAttachment = extend {}, targetAttachment
+ eAttachment = extend {}, @attachment
+
+ for constraint in @options.constraints
+ {to, attachment, pin} = constraint
+
+ attachment ?= ''
+
+ if ' ' in attachment
+ [changeAttachY, changeAttachX] = attachment.split(' ')
+ else
+ changeAttachX = changeAttachY = attachment
+
+ bounds = getBoundingRect @, to
+
+ if changeAttachY in ['target', 'both']
+ if (top < bounds[1] and tAttachment.top is 'top')
+ top += targetHeight
+ tAttachment.top = 'bottom'
+
+ if (top + height > bounds[3] and tAttachment.top is 'bottom')
+ top -= targetHeight
+ tAttachment.top = 'top'
+
+ if changeAttachY is 'together'
+ if top < bounds[1] and tAttachment.top is 'top'
+ if eAttachment.top is 'bottom'
+ top += targetHeight
+ tAttachment.top = 'bottom'
+
+ top += height
+ eAttachment.top = 'top'
+ else if eAttachment.top is 'top'
+ top += targetHeight
+ tAttachment.top = 'bottom'
+
+ top -= height
+ eAttachment.top = 'bottom'
+
+ if top + height > bounds[3] and tAttachment.top is 'bottom'
+ if eAttachment.top is 'top'
+ top -= targetHeight
+ tAttachment.top = 'top'
+
+ top -= height
+ eAttachment.top = 'bottom'
+ else if eAttachment.top is 'bottom'
+ top -= targetHeight
+ tAttachment.top = 'top'
+
+ top += height
+ eAttachment.top = 'top'
+
+ if tAttachment.top is 'middle'
+ if top + height > bounds[3] and eAttachment.top is 'top'
+ top -= height
+ eAttachment.top = 'bottom'
+
+ else if top < bounds[1] and eAttachment.top is 'bottom'
+ top += height
+ eAttachment.top = 'top'
+
+ if changeAttachX in ['target', 'both']
+ if (left < bounds[0] and tAttachment.left is 'left')
+ left += targetWidth
+ tAttachment.left = 'right'
+
+ if (left + width > bounds[2] and tAttachment.left is 'right')
+ left -= targetWidth
+ tAttachment.left = 'left'
+
+ if changeAttachX is 'together'
+ if left < bounds[0] and tAttachment.left is 'left'
+ if eAttachment.left is 'right'
+ left += targetWidth
+ tAttachment.left = 'right'
+
+ left += width
+ eAttachment.left = 'left'
+
+ else if eAttachment.left is 'left'
+ left += targetWidth
+ tAttachment.left = 'right'
+
+ left -= width
+ eAttachment.left = 'right'
+
+ else if left + width > bounds[2] and tAttachment.left is 'right'
+ if eAttachment.left is 'left'
+ left -= targetWidth
+ tAttachment.left = 'left'
+
+ left -= width
+ eAttachment.left = 'right'
+
+ else if eAttachment.left is 'right'
+ left -= targetWidth
+ tAttachment.left = 'left'
+
+ left += width
+ eAttachment.left = 'left'
+
+ else if tAttachment.left is 'center'
+ if left + width > bounds[2] and eAttachment.left is 'left'
+ left -= width
+ eAttachment.left = 'right'
+
+ else if left < bounds[0] and eAttachment.left is 'right'
+ left += width
+ eAttachment.left = 'left'
+
+ if changeAttachY in ['element', 'both']
+ if (top < bounds[1] and eAttachment.top is 'bottom')
+ top += height
+ eAttachment.top = 'top'
+
+ if (top + height > bounds[3] and eAttachment.top is 'top')
+ top -= height
+ eAttachment.top = 'bottom'
+
+ if changeAttachX in ['element', 'both']
+ if (left < bounds[0] and eAttachment.left is 'right')
+ left += width
+ eAttachment.left = 'left'
+
+ if (left + width > bounds[2] and eAttachment.left is 'left')
+ left -= width
+ eAttachment.left = 'right'
+
+ if typeof pin is 'string'
+ pin = (p.trim() for p in pin.split ',')
+ else if pin is true
+ pin = ['top', 'left', 'right', 'bottom']
+
+ pin or= []
+
+ pinned = []
+ oob = []
+ if top < bounds[1]
+ if 'top' in pin
+ top = bounds[1]
+ pinned.push 'top'
+ else
+ oob.push 'top'
+
+ if top + height > bounds[3]
+ if 'bottom' in pin
+ top = bounds[3] - height
+ pinned.push 'bottom'
+ else
+ oob.push 'bottom'
+
+ if left < bounds[0]
+ if 'left' in pin
+ left = bounds[0]
+ pinned.push 'left'
+ else
+ oob.push 'left'
+
+ if left + width > bounds[2]
+ if 'right' in pin
+ left = bounds[2] - width
+ pinned.push 'right'
+ else
+ oob.push 'right'
+
+ if pinned.length
+ pinnedClass = @options.pinnedClass ? @getClass('pinned')
+ addClasses.push pinnedClass
+ for side in pinned
+ addClasses.push "#{ pinnedClass }-#{ side }"
+
+ if oob.length
+ oobClass = @options.outOfBoundsClass ? @getClass('out-of-bounds')
+ addClasses.push oobClass
+ for side in oob
+ addClasses.push "#{ oobClass }-#{ side }"
+
+ if 'left' in pinned or 'right' in pinned
+ eAttachment.left = tAttachment.left = false
+ if 'top' in pinned or 'bottom' in pinned
+ eAttachment.top = tAttachment.top = false
+
+ if tAttachment.top isnt targetAttachment.top or tAttachment.left isnt targetAttachment.left or eAttachment.top isnt @attachment.top or eAttachment.left isnt @attachment.left
+ @updateAttachClasses eAttachment, tAttachment
+
+ defer =>
+ updateClasses @target, addClasses, allClasses
+ updateClasses @element, addClasses, allClasses
+
+ {top, left}
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