52 lines
1.3 KiB
JavaScript
52 lines
1.3 KiB
JavaScript
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import { VNode } from './vnode';
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import options from './options';
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let stack = [];
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/** JSX/hyperscript reviver
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* Benchmarks: https://esbench.com/bench/57ee8f8e330ab09900a1a1a0
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* @see http://jasonformat.com/wtf-is-jsx
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* @public
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* @example
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* /** @jsx h *\/
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* import { render, h } from 'preact';
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* render(<span>foo</span>, document.body);
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*/
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export function h(nodeName, attributes) {
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let children, lastSimple, child, simple, i;
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for (i=arguments.length; i-- > 2; ) {
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stack.push(arguments[i]);
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}
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if (attributes && attributes.children) {
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if (!stack.length) stack.push(attributes.children);
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delete attributes.children;
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}
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while (stack.length) {
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if ((child = stack.pop()) instanceof Array) {
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for (i=child.length; i--; ) stack.push(child[i]);
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}
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else if (child!=null && child!==false) {
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if (typeof child=='number' || child===true) child = String(child);
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simple = typeof child=='string';
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if (simple && lastSimple) {
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children[children.length-1] += child;
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}
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else {
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if (children) children.push(child);
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else children = [child];
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lastSimple = simple;
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}
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}
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}
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let p = new VNode(nodeName, attributes || undefined, children);
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// if a "vnode hook" is defined, pass every created VNode to it
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if (options.vnode) options.vnode(p);
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return p;
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}
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