import listToStyles from './listToStyles'
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export default function addStylesServer (parentId, list, isProduction, context) {
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if (!context && typeof __VUE_SSR_CONTEXT__ !== 'undefined') {
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context = __VUE_SSR_CONTEXT__
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}
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if (context) {
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if (!context.hasOwnProperty('styles')) {
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Object.defineProperty(context, 'styles', {
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enumerable: true,
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get: function() {
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return renderStyles(context._styles)
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}
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})
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// expose renderStyles for vue-server-renderer (vuejs/#6353)
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context._renderStyles = renderStyles
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}
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var styles = context._styles || (context._styles = {})
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list = listToStyles(parentId, list)
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if (isProduction) {
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addStyleProd(styles, list)
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} else {
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addStyleDev(styles, list)
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}
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}
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}
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// In production, render as few style tags as possible.
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// (mostly because IE9 has a limit on number of style tags)
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function addStyleProd (styles, list) {
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for (var i = 0; i < list.length; i++) {
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var parts = list[i].parts
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for (var j = 0; j < parts.length; j++) {
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var part = parts[j]
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// group style tags by media types.
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var id = part.media || 'default'
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var style = styles[id]
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if (style) {
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if (style.ids.indexOf(part.id) < 0) {
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style.ids.push(part.id)
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style.css += '\n' + part.css
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}
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} else {
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styles[id] = {
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ids: [part.id],
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css: part.css,
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media: part.media
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}
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}
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}
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}
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}
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// In dev we use individual style tag for each module for hot-reload
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// and source maps.
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function addStyleDev (styles, list) {
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for (var i = 0; i < list.length; i++) {
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var parts = list[i].parts
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for (var j = 0; j < parts.length; j++) {
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var part = parts[j]
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styles[part.id] = {
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ids: [part.id],
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css: part.css,
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media: part.media
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}
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}
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}
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}
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function renderStyles (styles) {
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var css = ''
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for (var key in styles) {
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var style = styles[key]
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css += '<style data-vue-ssr-id="' + style.ids.join(' ') + '"' +
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(style.media ? ( ' media="' + style.media + '"' ) : '') + '>' +
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style.css + '</style>'
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}
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return css
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}
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