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css2html.js
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(function(css2html, root) {
var doc = 'document' in this ? document
: require('jsdom').jsdom('<html><body /></html>', null, { features: { QuerySelector: true }}),
parserlib = root.parserlib || require('parserlib'),
fragment = doc.createElement('div'),
id = css2html + (+new Date),
parser = new parserlib.css.Parser(),
defaults = {
// Automatically expand selectors into valid DOM trees.
// For example, a selector `li` would create a DOM tree of `UL > LI`.
// A selector `div td a` would create a DOM tree of `DIV > TABLE > TBODY > TR > TD > A`.
autoExpand: true,
// Whether to set a data-* attribute with the text selector for a given node.
// Intended to be used for presentation or behavior from within the generated HTML.
dataAttr: false,
// Toggle debug mode and log to the console.
debug: false,
// What the script should return. Specify either `nodes` to return a DOM fragment or `html` to return a HTML string.
out: 'nodes',
// Whether the script should populate the generated HTML with placeholder content.
populate: false
};
fragment.id = id;
parser.addListener('startrule', parseRuleSet);
parser.addListener('error', parseError);
// Test if we're running server-side.
if (typeof exports !== 'undefined') {
if (typeof module !== 'undefined' && module.exports) {
root = module;
}
css2html = 'exports';
}
// css2html
// --------------
// Return the public API.
// Takes a `css` stylesheet string and optional `options` object with one or more of the properties described in the `defaults`.
root[css2html] = function(css, options) {
options || (options = {});
for (var prop in options) {
if (options[prop] !== void 0) defaults[prop] = options[prop];
}
fragment.innerHTML = '';
parser.parse(css);
if (defaults.populate) {
populate(fragment);
}
return defaults.out === 'html' ? fragment.innerHTML
: [].slice.call(fragment.childNodes);
}
// createNode
// --------------
// Converts a SelectorPart `part` into a DOM `node`.
function createNode(part) {
var node = doc.createElement(tagName(part));
part.modifiers.forEach(function(modifier) {
var text = modifier.text;
switch (modifier.type) {
case 'attribute':
// Test for `[attr]` selector.
if (/^\[([^=]+)\]$/.test(text)) {
node.setAttribute(RegExp.$1, RegExp.$1);
}
// Test for `[attr="value"]` selector.
else if (/^\[([^=]+?)[~|^$*]?=(.+)\]$/.test(text)) {
var attr = RegExp.$1,
value = RegExp.$2.replace(/^['"]|['"]$/g, '');
// If the attribute is a class name add to the string of class names.
if (attr === 'className') {
node.className += (node.className ? ' ' : '') + value;
}
// If the attribute is an id, set to the node.
else if (attr === 'id') {
node.id = value;
}
// Otherwise set the attribute to the node.
else {
node.setAttribute(attr, value);
}
}
break;
case 'class':
node.className += (node.className ? ' ' : '') + text.substr(1);
break;
case 'id':
node.id = text.substr(1);
break;
case 'pseudo':
// Test for `:lang(code)` pseudo class.
if (/^:lang\((\w{2})\)$/.test(text)) {
node.setAttribute('lang', RegExp.$1);
}
// Test for other supported psuedo classes.
else if (/^:(checked|default|disabled|enabled|indeterminate|invalid|optional|required|valid)$/.test(text)) {
node.setAttribute(RegExp.$1, RegExp.$1);
}
break;
}
});
return node;
}
// expand
// --------------
// Expand selectors into valid DOM trees.
function expand(parts) {
var relations = {
caption: 'table', command: 'menu', dd: 'dl', dt: 'dl', figcaption: 'figure', li: 'ul', option: 'select', summary: 'details', td: 'tr', th: 'tr', tr: 'tbody', tbody: 'table', tfoot: 'table', thead: 'table'
},
expandedParts = [],
parent,
child,
relation,
missing;
parts.forEach(function(part) {
if (part instanceof parserlib.css.SelectorPart) {
parent = child;
child = tagName(part);
relation = relations[child];
missing = [];
while (relation && relation != parent) {
missing.push(new parserlib.css.Combinator('>'));
missing.push(new parserlib.css.SelectorPart({ text: relation }, [], relation));
parent = relation;
relation = relations[relation];
}
expandedParts.push.apply(expandedParts, missing.reverse());
}
expandedParts.push(part);
});
return expandedParts;
}
// parseError
// --------------
function parseError(error) {
report(error.message);
}
// parseRuleSet
// --------------
// Parses a `ruleset` collection of selectors, creating DOM nodes.
function parseRuleSet(ruleset) {
ruleset.selectors.forEach(function(selector) {
var queryString = '',
nodes = [],
targets = [fragment],
parts = defaults.autoExpand ? expand(selector.parts) : selector.parts;
parts.forEach(function(part) {
var text = part.text
// Strip browser specific selectors.
.replace(/(:[:\-])(?![^\[]+[\]])[^ >+~]+/g, '')
// Strip pseudo elements and classes.
.replace(/:(active|after|before|empty|first-letter|first-line|focus|hover|link|visited)(?![^\[]+[\]])/g, '')
// Strip html (root) and body selectors.
.replace(/^((:root|html)([ >]body|)|body)/g, '');
if (!text) {
return;
}
queryString += text;
if (part instanceof parserlib.css.SelectorPart) {
try {
nodes = fragment.querySelectorAll('#' + id + '>' + queryString);
}
catch(error) {
error.queryString = queryString;
report(error);
}
if (!nodes.length) {
var node = createNode(part);
if (defaults.dataAttr) {
node.setAttribute('data-selector', queryString);
}
// Test for various child pseudo classes and ensure enough nodes exist to match the selectors.
// Plus one more to illustrate variation.
var n = (text.match(/:nth[^(]+\(([^)]+)\)(?![^\[]+[\]])/));
n = n ? (parseInt(n[1], 10) || 1) + 1
: /:(first|last)-(of|child)(?![^\[]+[\]])/.test(text) ? 2
: 1;
nodes = [];
targets.forEach(function(target) {
var i = n;
while (i--) {
var clone = node.cloneNode(false);
// Remember the selector for populating the node.
clone.__selectorPart__ = text;
target.appendChild(clone);
nodes.push(clone);
}
});
}
}
else if (part instanceof parserlib.css.Combinator) {
if (/[> ]/.test(text)) {
// If it's a `descendant` or `child` combinator
// then the current nodes become the next targets.
targets = [].slice.call(nodes);
}
}
});
});
}
// populate
// --------------
// Optionally populates the leaf nodes of a fragment with content.
function populate(node) {
var childNodes = [].slice.call(node.childNodes);
childNodes.forEach(function(childNode) {
if (childNode.childNodes.length) {
populate(childNode);
}
else {
var part = childNode.__selectorPart__,
tag = childNode.tagName;
if ((/input/i).test(tag)) {
childNode.value = part;
}
else if ((/img/i).test(tag)) {
childNode.src = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABAQMAAAAl21bKAAAAA1BMVEX///+nxBvIAAAAAXRSTlMAQObYZgAAABJJREFUeF4FwIEIAAAAAKD9qY8AAgABdDtSRwAAAABJRU5ErkJggg==';
}
else if (!(/(area|br|col|hr|param)/i).test(tag)) {
childNode.innerHTML = part;
}
}
});
}
// report
// --------------
// Helper for logging to the console.
function report(message) {
if (defaults.debug && 'console' in this) {
console.log(message);
}
}
// tagName
// --------------
// Helper for parsing out the tagName of a selector part.
function tagName(part) {
var tag = part.elementName && part.elementName !== '*' ? part.elementName.text : 'div';
return tag.toLowerCase();
}
})('css2html', this);