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