import { VNode } from './vnode'; import options from './options'; let 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(foo, 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 { if (children) children.push(child); else children = [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; }