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