my-idlers/node_modules/clean-css/lib/optimizer/level-2/remove-duplicate-font-at-rules.js

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var Token = require('../../tokenizer/token');
var serializeAll = require('../../writer/one-time').all;
var FONT_FACE_SCOPE = '@font-face';
function removeDuplicateFontAtRules(tokens) {
var fontAtRules = [];
var token;
var key;
var i, l;
for (i = 0, l = tokens.length; i < l; i++) {
token = tokens[i];
if (token[0] != Token.AT_RULE_BLOCK && token[1][0][1] != FONT_FACE_SCOPE) {
continue;
}
key = serializeAll([token]);
if (fontAtRules.indexOf(key) > -1) {
token[2] = [];
} else {
fontAtRules.push(key);
}
}
}
module.exports = removeDuplicateFontAtRules;