ce4c83ff
 wxy
初始提交
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'use strict';
Object.defineProperty(exports, "__esModule", {
value: true
});
var _postcss = require('postcss');
var _postcss2 = _interopRequireDefault(_postcss);
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
var OVERRIDABLE_RULES = ['keyframes', 'counter-style'];
var SCOPE_RULES = ['media', 'supports'];
function isOverridable(name) {
return OVERRIDABLE_RULES.indexOf(_postcss2.default.vendor.unprefixed(name)) !== -1;
}
function isScope(name) {
return SCOPE_RULES.indexOf(_postcss2.default.vendor.unprefixed(name)) !== -1;
}
function getScope(node) {
var current = node.parent;
var chain = [node.name, node.params];
do {
if (current.type === 'atrule' && isScope(current.name)) {
chain.unshift(current.name + ' ' + current.params);
}
current = current.parent;
} while (current);
return chain.join('|');
}
exports.default = _postcss2.default.plugin('postcss-discard-overridden', function () {
return function (css) {
var cache = {};
var rules = [];
css.walkAtRules(function (rule) {
if (rule.type === 'atrule' && isOverridable(rule.name)) {
var scope = getScope(rule);
cache[scope] = rule;
rules.push({
node: rule,
scope: scope
});
}
});
rules.forEach(function (rule) {
if (cache[rule.scope] !== rule.node) {
rule.node.remove();
}
});
};
});
module.exports = exports['default'];
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