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wapper.js
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wapper.js
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// Wapper version 0.1.0
// (c) 2011 Ben Pickles
//
// http://benpickles.github.com/wapper
//
// Released under MIT license.
var Wapper = {
split: function(range) {
var startParent = range.startContainer
var endParent = range.endContainer
if (startParent == endParent) {
// Achtung! Zero-length selection.
if (range.startOffset == range.endOffset) return []
endParent.splitText(range.endOffset)
var middle = startParent.splitText(range.startOffset)
return [middle]
} else {
var commonAncestor = range.commonAncestorContainer
var between = []
if (commonAncestor == startParent.parentNode && commonAncestor == endParent.parentNode) {
// Common scenario where selection contains a few text and element
// nodes within a block-level element - a <p> for instance.
var current = startParent.splitText(range.startOffset)
var after = endParent.splitText(range.endOffset)
for (current; current != after; current = current.nextSibling) {
between.push(current)
}
} else {
// More complex scenario where the selection spans multiple elements.
endParent.splitText(range.endOffset)
var start = startParent.splitText(range.startOffset)
var end = endParent
function nextViaParent(node) {
return node.nextSibling || nextViaParent(node.parentNode)
}
function previousViaParent(node) {
return node.previousSibling || previousViaParent(node.parentNode)
}
// Ascend the DOM until finding a direct child of the common ancestor.
function rootNode(node) {
while (node.parentNode != commonAncestor) {
node = node.parentNode
}
return node
}
var startRoot = rootNode(start)
var endRoot = rootNode(end)
var current = start
// Start.
if (startRoot == start) {
between.push(startRoot)
} else {
while (current.parentNode != commonAncestor) {
between.push(current)
current = nextViaParent(current)
}
}
var tail = []
// End.
if (endRoot == endParent) {
tail.push(endRoot)
} else {
current = endParent
while (current.parentNode != commonAncestor) {
tail.unshift(current)
current = previousViaParent(current)
}
}
current = startRoot
// Middle.
while (current.nextSibling != endRoot) {
between.push(current = current.nextSibling)
}
between = between.concat(tail)
}
return between
}
},
wrap: function(range, nodeName) {
nodeName = nodeName || "SPAN"
var elems = this.split(range)
var currentParent
var groups = []
var wrapped = []
function createWrapper() {
return document.createElement(nodeName)
}
function display(elem) {
if (elem.nodeType != 1) return
var style = window.getComputedStyle(elem, null)
return style && style.getPropertyValue("display")
}
// Group nodes by shared parent.
for (var i = 0; i < elems.length; i++) {
var elem = elems[i]
if (elem.parentNode == currentParent) {
groups[groups.length - 1].push(elem)
} else {
groups.push([elem])
}
currentParent = elem.parentNode
}
for (var g = 0; g < groups.length; g++) {
var children = groups[g]
if (display(children[0]) == "block") {
// Wrap a block-element's children not the block element itself.
for (var c = 0; c < children.length; c++) {
var wrapper = createWrapper()
wrapped.push(wrapper)
while (children[0].childNodes.length) {
wrapper.appendChild(children[0].firstChild)
}
children[0].appendChild(wrapper)
}
} else {
var wrapper = createWrapper()
wrapped.push(wrapper)
// Insert the wrapper before the first element.
children[0].parentNode.insertBefore(wrapper, children[0])
// Move the contained elements into the wrapper.
for (var c = 0; c < children.length; c++) {
wrapper.appendChild(children[c])
}
}
}
return wrapped
}
}