all files / src/ h.js

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'use strict';
 
exports.__esModule = true;
exports.h = h;
 
var _vnode = require('./vnode');
 
var _hooks = require('./hooks');
 
var _util = require('./util');
 
var SHARED_TEMP_ARRAY = [];
 
/** JSX/hyperscript reviver
 *	@see http://jasonformat.com/wtf-is-jsx
 *	@public
 *  @example
 *  /** @jsx h *\/
 *  import { render, h } from 'preact';
 *  render(<span>foo</span>, document.body);
 */
 
function h(nodeName, attributes, firstChild) {
	var len = arguments.length,
	    children = undefined,
	    arr = undefined,
	    lastSimple = undefined;
 
	if (len > 2) {
		var type = typeof firstChild;
		if (len === 3 && type !== 'object' && type !== 'function') {
			if (!_util.falsey(firstChild)) {
				children = [String(firstChild)];
			}
		} else {
			children = [];
			for (var i = 2; i < len; i++) {
				var _p = arguments[i];
				if (_util.falsey(_p)) continue;
				if (_p.join) {
					arr = _p;
				} else {
					arr = SHARED_TEMP_ARRAY;
					arr[0] = _p;
				}
				for (var j = 0; j < arr.length; j++) {
					var child = arr[j],
					    simple = !(_util.falsey(child) || _util.isFunction(child) || child instanceof _vnode.VNode);
					if (simple && !_util.isString(child)) child = String(child);
					if (simple && lastSimple) {
						children[children.length - 1] += child;
					} else Eif (!_util.falsey(child)) {
						children.push(child);
					}
					lastSimple = simple;
				}
			}
		}
	} else if (attributes && attributes.children) {
		return h(nodeName, attributes, attributes.children);
	}
 
	var p = new _vnode.VNode(nodeName, attributes || undefined, children);
	_hooks.optionsHook('vnode', p);
	return p;
}