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[experiment] Performance improvements for SSR#136
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155 changes: 155 additions & 0 deletionssrc/ssr.js
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,155 @@ | ||
| import { encodeEntities, styleObjToCss, assign } from './util'; | ||
| import { options } from 'preact'; | ||
| const VOID_ELEMENTS = /^(area|base|br|col|embed|hr|img|input|link|meta|param|source|track|wbr)$/; | ||
| const UNSAFE_NAME = /[\s\n\\/='"\0<>]/; | ||
| /** | ||
| * Render Preact JSX + Components to an HTML string. | ||
| * @param {import('preact').VNode|string|number|null|boolean} vnode any renderable value | ||
| * @param {object} context context object, forks throughout the tree | ||
| * @param {any} selectValue the current select value, passed down through the tree to set <options selected> | ||
| */ | ||
| export default function renderToString(vnode, context, selectValue) { | ||
| if (vnode == null || vnode === false || vnode === true) { | ||
| return ''; | ||
| } | ||
| if (typeof vnode !== 'object') { | ||
| return encodeEntities(vnode); | ||
| } | ||
| context = context || {}; | ||
| if (Array.isArray(vnode)) { | ||
| let s = ''; | ||
| for (let i=0; i<vnode.length; i++) { | ||
| s += renderToString(vnode[i], context, selectValue); | ||
| } | ||
| return s; | ||
| } | ||
| let nodeName = vnode.type, | ||
| props = vnode.props; | ||
| // components | ||
| if (typeof nodeName === 'function') { | ||
| let rendered; | ||
| let c = vnode.__c = { __v: vnode, context, props: vnode.props, __h: [] }; | ||
| // options.render | ||
| if (options.__r) options.__r(vnode); | ||
| // Necessary for createContext api. Setting this property will pass | ||
| // the context value as `this.context` just for this component. | ||
| let cxType = nodeName.contextType; | ||
| let provider = cxType && context[cxType.__c]; | ||
| let cctx = cxType != null ? (provider ? provider.props.value : cxType.__) : context; | ||
| if (nodeName.prototype && nodeName.prototype.render) { | ||
| c = vnode.__c = new nodeName(props, cctx); | ||
| c.__v = vnode; | ||
| // turn off stateful re-rendering: | ||
| c._dirty = c.__d = true; | ||
| c.props = props; | ||
| if (c.state==null) c.state = {}; | ||
| if (c._nextState==null && c.__s==null) { | ||
| c._nextState = c.__s = c.state; | ||
| } | ||
| c.context = cctx; | ||
| if (nodeName.getDerivedStateFromProps) { | ||
| c.state = assign(assign({}, c.state), nodeName.getDerivedStateFromProps(c.props, c.state)); | ||
| } | ||
| else if (c.componentWillMount) { | ||
| c.componentWillMount(); | ||
| } | ||
| // If the user called setState in cWM we need to flush pending, | ||
| // state updates. This is the same behaviour in React. | ||
| c.state = c._nextState !== c.state | ||
| ? c._nextState : c.__s!==c.state | ||
| ? c.__s : c.state; | ||
| rendered = c.render(c.props, c.state, c.context); | ||
| } | ||
| else { | ||
| // stateless functional components | ||
| rendered = nodeName.call(c, props, cctx); | ||
| } | ||
| if (c.getChildContext) { | ||
| context = assign(assign({}, context), c.getChildContext()); | ||
| } | ||
| return renderToString(rendered, context, selectValue); | ||
| } | ||
| if (UNSAFE_NAME.test(nodeName)) return ''; | ||
| let html = ''; | ||
| let s = '<'; | ||
| s += nodeName; | ||
| if (props) { | ||
| for (let name in props) { | ||
| let v = props[name]; | ||
| let type; | ||
| if (name === 'children' || name === 'key' || name === 'ref' || UNSAFE_NAME.test(name)) { | ||
| // skip | ||
| } | ||
| else if (nodeName === 'option' && name === 'value' && selectValue === v) { | ||
| s += ' selected'; | ||
| selectValue = undefined; | ||
| } | ||
| else if (nodeName === 'select' && name === 'value') { | ||
| selectValue = v; | ||
| } | ||
| else if (name === 'dangerouslySetInnerHTML') { | ||
| html = v && v.__html; | ||
| } | ||
| else if ((v || v===0) && (type = typeof v) !== 'function') { | ||
| if (name === 'style' && type === 'object') { | ||
| v = styleObjToCss(v); | ||
| } | ||
| else if (name.substring(0,5) === 'xlink') { | ||
| // this doesn't actually need to be limited to SVG, since attributes "xlinkHref" are invalid anyway | ||
| name = name.replace(/^xlink([A-Z])/, 'xlink:$1'); | ||
| } | ||
| s += ' '; | ||
| s += name; | ||
| if (v !== true && v !== '') { | ||
| s += '="'; | ||
| s += encodeEntities(v); | ||
| s += '"'; | ||
| } | ||
| } | ||
| } | ||
| } | ||
| let isVoid = VOID_ELEMENTS.test(nodeName); | ||
| if (isVoid) { | ||
| s += ' />'; | ||
| } | ||
| else { | ||
| s += '>'; | ||
| } | ||
| if (html) { | ||
| s += html; | ||
| } | ||
| else if (props && props.children) { | ||
| s += renderToString(props.children, context, selectValue); | ||
| } | ||
| if (!isVoid) { | ||
| s += '</'; | ||
| s += nodeName; | ||
| s += '>'; | ||
| } | ||
| return s; | ||
| } |
16 changes: 11 additions & 5 deletionssrc/util.js
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