forked from enviPath/enviPy
61 lines
1.5 KiB
JavaScript
61 lines
1.5 KiB
JavaScript
import { VNode } from './vnode';
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import options from './options';
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const stack = [];
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const EMPTY_CHILDREN = [];
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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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*/
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export function h(nodeName, attributes) {
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let children=EMPTY_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!=null) {
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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()) && child.pop!==undefined) {
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for (i=child.length; i--; ) stack.push(child[i]);
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}
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else {
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if (child===true || child===false) child = null;
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if ((simple = typeof nodeName!=='function')) {
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if (child==null) child = '';
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else if (typeof child==='number') child = String(child);
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else if (typeof child!=='string') simple = false;
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}
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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 if (children===EMPTY_CHILDREN) {
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children = [child];
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}
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else {
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children.push(child);
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}
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lastSimple = simple;
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}
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}
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let p = new VNode();
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p.nodeName = nodeName;
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p.children = children;
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p.attributes = attributes==null ? undefined : attributes;
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p.key = attributes==null ? undefined : attributes.key;
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// if a "vnode hook" is defined, pass every created VNode to it
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if (options.vnode!==undefined) options.vnode(p);
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return p;
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}
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