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| var stringify = require('css').stringify | |
| var parse = require('css').parse | |
| module.exports = filter | |
| function filter (css, selectors) { | |
| var tree = parse(css) | |
| var rules = tree.stylesheet.rules | |
| tree.stylesheet.rules = rules.reduce(reduce, []) | |
| var str = stringify(tree) | |
| return str.replace(/[\n]+?[\s]*/g, '') // remove all whitespace & newlines | |
| .replace(/ *[>] */g, '>') | |
| .replace(/ *[:] */g, ':') | |
| .replace(/ *\}/g, '}') | |
| .replace(/ *\{/g, '{') | |
| function reduce (arr, rule) { | |
| if (rule.type === 'media') { | |
| rule.rules = rule.rules.reduce(reduce, []) | |
| if (rule.rules.length) arr.push(rule) // Don't push empty media queries | |
| return arr | |
| } else if (rule.type === 'rule') { | |
| var matches = rule.selectors.some(function (select) { | |
| if (select === '*') return true | |
| var selector = select.match(/([.#]?[\w\d-_]+)/) | |
| if (selector) selector = selector[1] | |
| return selectors.indexOf(selector) !== -1 | |
| }) | |
| if (matches) { | |
| arr.push(rule) | |
| } | |
| } | |
| return arr | |
| } | |
| } |