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h.js
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h.js
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/*
* Element
*/
/**
* General tree
*
* /** @jsx h * /
*
* @name h
* @function
* @access public
*/
var H = function (argv) {
if (!(this instanceof H)) {
if (typeof argv === 'function') {
return argv.apply(argv, [].slice.call(arguments, 1, arguments.length));
}
return new H(arguments);
}
if (argv[0] instanceof H) {
return argv[0];
}
this.tag = argv[0].toLowerCase();
this.props = argv[1] || {};
if (argv[2] === null || argv[2] === undefined) {
return;
}
if (argv.length > 2) {
if (typeof argv[2] !== 'object' && argv.length === 3) {
this.children = [_createTextNode(argv[2])];
} else if (Array.isArray(argv[2])) {
this.children = argv[2];
} else {
this.children = [].concat.apply([], [].slice.call(argv, 2, argv.length))
.filter(function (n) {
return n !== null && n !== undefined && n !== false;
})
.map(function (n) {
if (!(n instanceof H)) {
return _createTextNode(n);
} else {
return n;
}
});
}
}
};
/**
* Tree renderer
*
* @name render
* @function
* @access public
* @param {Boolean} fasle - do not save DOM into tree
*/
H.prototype.render = function (node, parent) {
node = node || this;
node.el = createElement(node.tag ? node : this, parent);
var children = node.children;
if (typeof children === 'object') {
for (var i = 0; i < children.length; i++) {
node.el.appendChild(this.render(children[i], node.el));
}
}
return node.el;
};
H.prototype.setProp = function (name, value) {
if (typeof this.el !== 'undefined') {
if (name === 'className') {
this.el.setAttribute('class', value);
} else if (name === 'style' && typeof value !== 'string') {
this.el.setAttribute('style', _stylePropToString(value));
} else if (name.match(/^on/)) {
this.addEvent(name, value);
} else if (name === 'ref') {
if (typeof value === 'function') {
value(this.el);
}
} else if (typeof value === 'boolean' || value === 'true') {
this.el.setAttribute(name, value);
this.el[name] = Boolean(value);
} else {
this.el.setAttribute(name, value);
}
}
this.props[name] = value;
};
H.prototype.setProps = function (props) {
var propNames = Object.keys(props);
for (var i = 0; i < propNames.length; i++) {
var prop = propNames[i];
this.setProp(prop, props[prop]);
}
};
H.prototype.rmProp = function (name) {
if (typeof this.el !== 'undefined') {
if (name === 'className') {
this.el.removeAttribute('class');
} else if (name.match(/^on/)) {
this.removeEvent(name);
} else if (name === 'ref') {
/* Nothing to do */
} else if (typeof value === 'boolean') {
this.el.removeAttribute(name);
delete this.el[name];
} else {
this.el.removeAttribute(name);
}
}
delete this.props[name];
};
H.prototype.addEvent = function (name, listener) {
name = name.slice(2).toLowerCase();
this.listeners = this.listeners || {};
if (name in this.listeners) {
this.removeEvent(name);
}
this.listeners[name] = listener;
this.el.addEventListener(name, listener);
};
H.prototype.removeEvent = function (name) {
name = name.replace(/^on/, '').toLowerCase();
if (name in this.listeners) {
this.el.removeEventListener(name, this.listeners[name]);
delete this.listeners[name];
}
};
H.prototype.clone = function () {
var node = {
tag: String(this.tag),
props: _cloneProps(this.props)
};
if (typeof this.children !== 'undefined') {
node.children = this.tag === 'text'
? String(this.children)
: this.children.map(function (child) {
return child.tag === 'text' ? _createTextNode(child.children) : child.clone();
});
}
return H(node.tag, node.props, node.children);
};
var _cloneProps = function (props, keepRefs) {
if (typeof keepRefs === 'undefined') {
keepRefs = true;
}
var attrs = Object.keys(props);
var i;
var name;
var cloned = {};
for (i = 0; i < attrs.length; i++) {
name = attrs[i];
if (typeof props[name] === 'string') {
cloned[name] = String(props[name]);
} else if (typeof props[name] === 'function' && keepRefs === true) {
cloned[name] = props[name];
} else if (typeof props[name] === 'boolean') {
cloned[name] = Boolean(props[name]);
} else if (typeof props[name] === 'object') {
cloned[name] = _cloneProps(props[name]);
}
}
return cloned;
};
var _stylePropToString = function (props) {
var out = '';
var attrs = Object.keys(props);
for (var i = 0; i < attrs.length; i++) {
out += attrs[i].replace(/([A-Z])/g, '-$1').toLowerCase();
out += ':';
out += props[attrs[i]];
out += ';';
}
return out;
};
var _createTextNode = function (text) {
return {
tag: 'text',
children: String(text)
};
};
var createElement = function (node, parent) {
node.el = node.tag === 'text'
? document.createTextNode(node.children)
: document.createElement(node.tag);
if (typeof node.props !== 'undefined') {
node.setProps(node.props);
}
if (typeof parent !== 'undefined') {
parent.appendChild(node.el);
}
return node.el;
};
exports.h = H;
exports.createElement = createElement;