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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
}
}
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