/**
* The collapseWhitespace function is adapted from collapse-whitespace
* by Luc Thevenard.
*
* The MIT License (MIT)
*
* Copyright (c) 2014 Luc Thevenard <lucthevenard@gmail.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
/**
* collapseWhitespace(options) removes extraneous whitespace from an the given element.
*
* @param {Object} options
*/
function collapseWhitespace (options) {
var element = options.element
var isBlock = options.isBlock
var isVoid = options.isVoid
var isPre = options.isPre || function (node) {
return node.nodeName === 'PRE'
}
if (!element.firstChild || isPre(element)) return
var prevText = null
var prevVoid = false
var prev = null
var node = next(prev, element, isPre)
while (node !== element) {
if (node.nodeType === 3 || node.nodeType === 4) { // Node.TEXT_NODE or Node.CDATA_SECTION_NODE
var text = node.data.replace(/[ \r\n\t]+/g, ' ')
if ((!prevText || / $/.test(prevText.data)) &&
!prevVoid && text[0] === ' ') {
text = text.substr(1)
}
// `text` might be empty at this point.
if (!text) {
node = remove(node)
continue
}
node.data = text
prevText = node
} else if (node.nodeType === 1) { // Node.ELEMENT_NODE
if (isBlock(node) || node.nodeName === 'BR') {
if (prevText) {
prevText.data = prevText.data.replace(/ $/, '')
}
prevText = null
prevVoid = false
} else if (isVoid(node)) {
// Avoid trimming space around non-block, non-BR void elements.
prevText = null
prevVoid = true
}
} else {
node = remove(node)
continue
}
var nextNode = next(prev, node, isPre)
prev = node
node = nextNode
}
if (prevText) {
prevText.data = prevText.data.replace(/ $/, '')
if (!prevText.data) {
remove(prevText)
}
}
}
/**
* remove(node) removes the given node from the DOM and returns the
* next node in the sequence.
*
* @param {Node} node
* @return {Node} node
*/
function remove (node) {
var next = node.nextSibling || node.parentNode
node.parentNode.removeChild(node)
return next
}
/**
* next(prev, current, isPre) returns the next node in the sequence, given the
* current and previous nodes.
*
* @param {Node} prev
* @param {Node} current
* @param {Function} isPre
* @return {Node}
*/
function next (prev, current, isPre) {
if ((prev && prev.parentNode === current) || isPre(current)) {
return current.nextSibling || current.parentNode
}
return current.firstChild || current.nextSibling || current.parentNode
}
export default collapseWhitespace
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