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HTMLView.js
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HTMLView.js
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/**
* Dumb HTML views. Mostly to demonstrate how the visitor pattern over these
* views works, as driven by validation. I'm not convinced it's actually a good
* idea to do validation.
*
* @provides javelin-view-html
* @requires javelin-install
* javelin-dom
* javelin-view-visitor
* javelin-util
*/
JX.install('HTMLView', {
extend: 'View',
members : {
render: function(rendered_children) {
return JX.$N(this.getName(), this.getAllAttributes(), rendered_children);
},
validate: function() {
this.accept(JX.HTMLView.getValidatingVisitor());
}
},
statics: {
getValidatingVisitor: function() {
return new JX.ViewVisitor(JX.HTMLView.validate);
},
validate: function(view) {
var spec = this._getHTMLSpec();
if (!(view.getName() in spec)) {
throw new Error('invalid tag');
}
var tag_spec = spec[view.getName()];
var attrs = view.getAllAttributes();
for (var attr in attrs) {
if (!(attr in tag_spec)) {
throw new Error('invalid attr');
}
var validator = tag_spec[attr];
if (typeof validator === 'function') {
return validator(attrs[attr]);
}
}
return true;
},
_validateRel: function(target) {
return target in {
'_blank': 1,
'_self': 1,
'_parent': 1,
'_top': 1
};
},
_getHTMLSpec: function() {
var attrs_any_can_have = {
className: 1,
id: 1,
sigil: 1
};
var form_elem_attrs = {
name: 1,
value: 1
};
var spec = {
a: { href: 1, target: JX.HTMLView._validateRel },
b: {},
blockquote: {},
br: {},
button: JX.copy({}, form_elem_attrs),
canvas: {},
code: {},
dd: {},
div: {},
dl: {},
dt: {},
em: {},
embed: {},
fieldset: {},
form: { type: 1 },
h1: {},
h2: {},
h3: {},
h4: {},
h5: {},
h6: {},
hr: {},
i: {},
iframe: { src: 1 },
img: { src: 1, alt: 1 },
input: JX.copy({}, form_elem_attrs),
label: {'for': 1},
li: {},
ol: {},
optgroup: {},
option: JX.copy({}, form_elem_attrs),
p: {},
pre: {},
q: {},
select: {},
span: {},
strong: {},
sub: {},
sup: {},
table: {},
tbody: {},
td: {},
textarea: {},
tfoot: {},
th: {},
thead: {},
tr: {},
ul: {}
};
for (var k in spec) {
JX.copy(spec[k], attrs_any_can_have);
}
return spec;
},
registerToInterpreter: function(view_interpreter) {
var spec = this._getHTMLSpec();
for (var tag in spec) {
view_interpreter.register(tag, JX.HTMLView);
}
return view_interpreter;
}
}
});

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