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)[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 if (!_util.falsey(child)) {
						children.push(child);
						lastSimple = simple;
					}
				}
			}
		}
	} else if (attributes && attributes.children) {
		return h(nodeName, attributes, attributes.children);
	}
 
	if (attributes) {
		if (attributes.children) {
			delete attributes.children;
		}
 
		if (!_util.isFunction(nodeName)) {
			// normalize className to class.
			if ('className' in attributes) {
				attributes['class'] = attributes.className;
				delete attributes.className;
			}
 
			lastSimple = attributes['class'];
			if (lastSimple && !_util.isString(lastSimple)) {
				attributes['class'] = _util.hashToClassName(lastSimple);
			}
 
			lastSimple = attributes.style;
			if (lastSimple && !_util.isString(lastSimple)) {
				attributes.style = _util.styleObjToCss(lastSimple);
			}
		}
	}
 
	var p = new _vnode.VNode(nodeName, attributes || undefined, children);
	_hooks.optionsHook('vnode', p);
	return p;
}