index.js
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'use strict';
exports.__esModule = true;
var _postcss = require('postcss');
var _alphanumSort = require('alphanum-sort');
var _alphanumSort2 = _interopRequireDefault(_alphanumSort);
var _has = require('has');
var _has2 = _interopRequireDefault(_has);
var _postcssSelectorParser = require('postcss-selector-parser');
var _postcssSelectorParser2 = _interopRequireDefault(_postcssSelectorParser);
var _unquote = require('./lib/unquote');
var _unquote2 = _interopRequireDefault(_unquote);
var _canUnquote = require('./lib/canUnquote');
var _canUnquote2 = _interopRequireDefault(_canUnquote);
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
var pseudoElements = ['::before', '::after', '::first-letter', '::first-line'];
function getParsed(selectors, callback) {
return (0, _postcssSelectorParser2.default)(callback).process(selectors).result;
}
function attribute(selector) {
if (selector.value) {
// Join selectors that are split over new lines
selector.value = selector.value.replace(/\\\n/g, '').trim();
if ((0, _canUnquote2.default)(selector.value)) {
selector.value = (0, _unquote2.default)(selector.value);
}
selector.operator = selector.operator.trim();
}
if (selector.raws && selector.raws.insensitive) {
selector.raws.insensitive = '';
}
selector.attribute = selector.attribute.trim();
}
function combinator(selector) {
var value = selector.value.trim();
selector.value = value.length ? value : ' ';
}
var pseudoReplacements = {
':nth-child': ':first-child',
':nth-of-type': ':first-of-type',
':nth-last-child': ':last-child',
':nth-last-of-type': ':last-of-type'
};
function pseudo(selector) {
if (selector.nodes.length === 1 && pseudoReplacements[selector.value]) {
var first = selector.at(0);
var one = first.at(0);
if (first.length === 1) {
if (one.value === '1') {
selector.replaceWith(_postcssSelectorParser2.default.pseudo({
value: pseudoReplacements[selector.value]
}));
}
if (one.value === 'even') {
one.value = '2n';
}
}
if (first.length === 3) {
var two = first.at(1);
var three = first.at(2);
if (one.value === '2n' && two.value === '+' && three.value === '1') {
one.value = 'odd';
two.remove();
three.remove();
}
}
return;
}
var uniques = [];
selector.walk(function (child) {
if (child.type === 'selector') {
var childStr = String(child);
if (!~uniques.indexOf(childStr)) {
uniques.push(childStr);
} else {
child.remove();
}
}
});
if (~pseudoElements.indexOf(selector.value)) {
selector.value = selector.value.slice(1);
}
}
var tagReplacements = {
from: '0%',
'100%': 'to'
};
function tag(selector) {
var value = selector.value;
if ((0, _has2.default)(tagReplacements, value)) {
selector.value = tagReplacements[value];
}
}
function universal(selector) {
var next = selector.next();
if (next && next.type !== 'combinator') {
selector.remove();
}
}
var reducers = {
attribute: attribute,
combinator: combinator,
pseudo: pseudo,
tag: tag,
universal: universal
};
function optimise(rule) {
var selector = rule.raws.selector && rule.raws.selector.value === rule.selector ? rule.raws.selector.raw : rule.selector;
// If the selector ends with a ':' it is likely a part of a custom mixin,
// so just pass through.
if (selector[selector.length - 1] === ':') {
return;
}
rule.selector = getParsed(selector, function (selectors) {
selectors.nodes = (0, _alphanumSort2.default)(selectors.nodes, { insensitive: true });
var uniqueSelectors = [];
selectors.walk(function (sel) {
var type = sel.type;
// Trim whitespace around the value
sel.spaces.before = sel.spaces.after = '';
if ((0, _has2.default)(reducers, type)) {
reducers[type](sel);
return;
}
var toString = String(sel);
if (type === 'selector' && sel.parent.type !== 'pseudo') {
if (!~uniqueSelectors.indexOf(toString)) {
uniqueSelectors.push(toString);
} else {
sel.remove();
}
}
});
});
}
exports.default = (0, _postcss.plugin)('postcss-minify-selectors', function () {
return function (css) {
return css.walkRules(optimise);
};
});
module.exports = exports['default'];