160 lines
4 KiB
JavaScript
Executable file
160 lines
4 KiB
JavaScript
Executable file
'use strict';
|
|
|
|
exports.type = 'full';
|
|
|
|
exports.active = true;
|
|
|
|
exports.description = 'minifies styles and removes unused styles based on usage data';
|
|
|
|
exports.params = {
|
|
// ... CSSO options goes here
|
|
|
|
// additional
|
|
usage: {
|
|
force: false, // force to use usage data even if it unsafe (document contains <script> or on* attributes)
|
|
ids: true,
|
|
classes: true,
|
|
tags: true
|
|
}
|
|
};
|
|
|
|
var csso = require('csso');
|
|
|
|
/**
|
|
* Minifies styles (<style> element + style attribute) using CSSO
|
|
*
|
|
* @author strarsis <strarsis@gmail.com>
|
|
*/
|
|
exports.fn = function(ast, options) {
|
|
options = options || {};
|
|
|
|
var minifyOptionsForStylesheet = cloneObject(options);
|
|
var minifyOptionsForAttribute = cloneObject(options);
|
|
var elems = findStyleElems(ast);
|
|
|
|
minifyOptionsForStylesheet.usage = collectUsageData(ast, options);
|
|
minifyOptionsForAttribute.usage = null;
|
|
|
|
elems.forEach(function(elem) {
|
|
if (elem.isElem('style')) {
|
|
// <style> element
|
|
var styleCss = elem.content[0].text || elem.content[0].cdata || [];
|
|
var DATA = styleCss.indexOf('>') >= 0 || styleCss.indexOf('<') >= 0 ? 'cdata' : 'text';
|
|
|
|
elem.content[0][DATA] = csso.minify(styleCss, minifyOptionsForStylesheet).css;
|
|
} else {
|
|
// style attribute
|
|
var elemStyle = elem.attr('style').value;
|
|
|
|
elem.attr('style').value = csso.minifyBlock(elemStyle, minifyOptionsForAttribute).css;
|
|
}
|
|
});
|
|
|
|
return ast;
|
|
};
|
|
|
|
function cloneObject(obj) {
|
|
var result = {};
|
|
|
|
for (var key in obj) {
|
|
result[key] = obj[key];
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
function findStyleElems(ast) {
|
|
|
|
function walk(items, styles) {
|
|
for (var i = 0; i < items.content.length; i++) {
|
|
var item = items.content[i];
|
|
|
|
// go deeper
|
|
if (item.content) {
|
|
walk(item, styles);
|
|
}
|
|
|
|
if (item.isElem('style') && !item.isEmpty()) {
|
|
styles.push(item);
|
|
} else if (item.isElem() && item.hasAttr('style')) {
|
|
styles.push(item);
|
|
}
|
|
}
|
|
|
|
return styles;
|
|
}
|
|
|
|
return walk(ast, []);
|
|
}
|
|
|
|
function shouldFilter(options, name) {
|
|
if ('usage' in options === false) {
|
|
return true;
|
|
}
|
|
|
|
if (options.usage && name in options.usage === false) {
|
|
return true;
|
|
}
|
|
|
|
return Boolean(options.usage && options.usage[name]);
|
|
}
|
|
|
|
function collectUsageData(ast, options) {
|
|
|
|
function walk(items, usageData) {
|
|
for (var i = 0; i < items.content.length; i++) {
|
|
var item = items.content[i];
|
|
|
|
// go deeper
|
|
if (item.content) {
|
|
walk(item, usageData);
|
|
}
|
|
|
|
if (item.isElem('script')) {
|
|
safe = false;
|
|
}
|
|
|
|
if (item.isElem()) {
|
|
usageData.tags[item.elem] = true;
|
|
|
|
if (item.hasAttr('id')) {
|
|
usageData.ids[item.attr('id').value] = true;
|
|
}
|
|
|
|
if (item.hasAttr('class')) {
|
|
item.attr('class').value.replace(/^\s+|\s+$/g, '').split(/\s+/).forEach(function(className) {
|
|
usageData.classes[className] = true;
|
|
});
|
|
}
|
|
|
|
if (item.attrs && Object.keys(item.attrs).some(function(name) { return /^on/i.test(name); })) {
|
|
safe = false;
|
|
}
|
|
}
|
|
}
|
|
|
|
return usageData;
|
|
}
|
|
|
|
var safe = true;
|
|
var usageData = {};
|
|
var hasData = false;
|
|
var rawData = walk(ast, {
|
|
ids: Object.create(null),
|
|
classes: Object.create(null),
|
|
tags: Object.create(null)
|
|
});
|
|
|
|
if (!safe && options.usage && options.usage.force) {
|
|
safe = true;
|
|
}
|
|
|
|
for (var key in rawData) {
|
|
if (shouldFilter(options, key)) {
|
|
usageData[key] = Object.keys(rawData[key]);
|
|
hasData = true;
|
|
}
|
|
}
|
|
|
|
return safe && hasData ? usageData : null;
|
|
}
|