lepu-test-platform-web/node_modules/vue-style-loader/lib/addStylesClient.js

223 lines
6.1 KiB
JavaScript

/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
Modified by Evan You @yyx990803
*/
var hasDocument = typeof document !== 'undefined'
if (typeof DEBUG !== 'undefined' && DEBUG) {
if (!hasDocument) {
throw new Error(
'vue-style-loader cannot be used in a non-browser environment. ' +
"Use { target: 'node' } in your Webpack config to indicate a server-rendering environment."
) }
}
var listToStyles = require('./listToStyles')
/*
type StyleObject = {
id: number;
parts: Array<StyleObjectPart>
}
type StyleObjectPart = {
css: string;
media: string;
sourceMap: ?string
}
*/
var stylesInDom = {/*
[id: number]: {
id: number,
refs: number,
parts: Array<(obj?: StyleObjectPart) => void>
}
*/}
var head = hasDocument && (document.head || document.getElementsByTagName('head')[0])
var singletonElement = null
var singletonCounter = 0
var isProduction = false
var noop = function () {}
var options = null
var ssrIdKey = 'data-vue-ssr-id'
// Force single-tag solution on IE6-9, which has a hard limit on the # of <style>
// tags it will allow on a page
var isOldIE = typeof navigator !== 'undefined' && /msie [6-9]\b/.test(navigator.userAgent.toLowerCase())
module.exports = function (parentId, list, _isProduction, _options) {
isProduction = _isProduction
options = _options || {}
var styles = listToStyles(parentId, list)
addStylesToDom(styles)
return function update (newList) {
var mayRemove = []
for (var i = 0; i < styles.length; i++) {
var item = styles[i]
var domStyle = stylesInDom[item.id]
domStyle.refs--
mayRemove.push(domStyle)
}
if (newList) {
styles = listToStyles(parentId, newList)
addStylesToDom(styles)
} else {
styles = []
}
for (var i = 0; i < mayRemove.length; i++) {
var domStyle = mayRemove[i]
if (domStyle.refs === 0) {
for (var j = 0; j < domStyle.parts.length; j++) {
domStyle.parts[j]()
}
delete stylesInDom[domStyle.id]
}
}
}
}
function addStylesToDom (styles /* Array<StyleObject> */) {
for (var i = 0; i < styles.length; i++) {
var item = styles[i]
var domStyle = stylesInDom[item.id]
if (domStyle) {
domStyle.refs++
for (var j = 0; j < domStyle.parts.length; j++) {
domStyle.parts[j](item.parts[j])
}
for (; j < item.parts.length; j++) {
domStyle.parts.push(addStyle(item.parts[j]))
}
if (domStyle.parts.length > item.parts.length) {
domStyle.parts.length = item.parts.length
}
} else {
var parts = []
for (var j = 0; j < item.parts.length; j++) {
parts.push(addStyle(item.parts[j]))
}
stylesInDom[item.id] = { id: item.id, refs: 1, parts: parts }
}
}
}
function createStyleElement () {
var styleElement = document.createElement('style')
styleElement.type = 'text/css'
head.appendChild(styleElement)
return styleElement
}
function addStyle (obj /* StyleObjectPart */) {
var update, remove
var styleElement = document.querySelector('style[' + ssrIdKey + '~="' + obj.id + '"]')
if (styleElement) {
if (isProduction) {
// has SSR styles and in production mode.
// simply do nothing.
return noop
} else {
// has SSR styles but in dev mode.
// for some reason Chrome can't handle source map in server-rendered
// style tags - source maps in <style> only works if the style tag is
// created and inserted dynamically. So we remove the server rendered
// styles and inject new ones.
styleElement.parentNode.removeChild(styleElement)
}
}
if (isOldIE) {
// use singleton mode for IE9.
var styleIndex = singletonCounter++
styleElement = singletonElement || (singletonElement = createStyleElement())
update = applyToSingletonTag.bind(null, styleElement, styleIndex, false)
remove = applyToSingletonTag.bind(null, styleElement, styleIndex, true)
} else {
// use multi-style-tag mode in all other cases
styleElement = createStyleElement()
update = applyToTag.bind(null, styleElement)
remove = function () {
styleElement.parentNode.removeChild(styleElement)
}
}
update(obj)
return function updateStyle (newObj /* StyleObjectPart */) {
if (newObj) {
if (newObj.css === obj.css &&
newObj.media === obj.media &&
newObj.sourceMap === obj.sourceMap) {
return
}
update(obj = newObj)
} else {
remove()
}
}
}
var replaceText = (function () {
var textStore = []
return function (index, replacement) {
textStore[index] = replacement
return textStore.filter(Boolean).join('\n')
}
})()
function applyToSingletonTag (styleElement, index, remove, obj) {
var css = remove ? '' : obj.css
if (styleElement.styleSheet) {
styleElement.styleSheet.cssText = replaceText(index, css)
} else {
var cssNode = document.createTextNode(css)
var childNodes = styleElement.childNodes
if (childNodes[index]) styleElement.removeChild(childNodes[index])
if (childNodes.length) {
styleElement.insertBefore(cssNode, childNodes[index])
} else {
styleElement.appendChild(cssNode)
}
}
}
function applyToTag (styleElement, obj) {
var css = obj.css
var media = obj.media
var sourceMap = obj.sourceMap
if (media) {
styleElement.setAttribute('media', media)
}
if (options.ssrId) {
styleElement.setAttribute(ssrIdKey, obj.id)
}
if (sourceMap) {
// https://developer.chrome.com/devtools/docs/javascript-debugging
// this makes source maps inside style tags work properly in Chrome
css += '\n/*# sourceURL=' + sourceMap.sources[0] + ' */'
// http://stackoverflow.com/a/26603875
css += '\n/*# sourceMappingURL=data:application/json;base64,' + btoa(unescape(encodeURIComponent(JSON.stringify(sourceMap)))) + ' */'
}
if (styleElement.styleSheet) {
styleElement.styleSheet.cssText = css
} else {
while (styleElement.firstChild) {
styleElement.removeChild(styleElement.firstChild)
}
styleElement.appendChild(document.createTextNode(css))
}
}