| "use strict"; |
| |
| const mediaParser = require("postcss-media-query-parser").default; |
| const report = require("../../utils/report"); |
| const ruleMessages = require("../../utils/ruleMessages"); |
| const validateOptions = require("../../utils/validateOptions"); |
| const valueParser = require("postcss-value-parser"); |
| |
| const ruleName = "no-duplicate-at-import-rules"; |
| |
| const messages = ruleMessages(ruleName, { |
| rejected: atImport => `Unexpected duplicate @import rule ${atImport}` |
| }); |
| |
| const rule = function(actual) { |
| return (root, result) => { |
| const validOptions = validateOptions(result, ruleName, { actual }); |
| |
| if (!validOptions) { |
| return; |
| } |
| |
| const imports = {}; |
| |
| root.walkAtRules(/^import$/i, atRule => { |
| const params = valueParser(atRule.params).nodes; |
| |
| if (!params.length) { |
| return; |
| } |
| |
| // extract uri from url() if exists |
| const uri = |
| params[0].type === "function" && params[0].value === "url" |
| ? params[0].nodes[0].value |
| : params[0].value; |
| // extract media queries if any |
| const media = mediaParser(valueParser.stringify(params.slice(1))) |
| .nodes.map(n => n.value.replace(/\s/g, "")) |
| .filter(n => n.length); |
| |
| const isDuplicate = media.length |
| ? imports[uri] && media.some(q => imports[uri].indexOf(q) !== -1) |
| : imports[uri]; |
| |
| if (isDuplicate) { |
| report({ |
| message: messages.rejected(uri), |
| node: atRule, |
| result, |
| ruleName |
| }); |
| |
| return; |
| } |
| |
| if (!imports[uri]) imports[uri] = []; |
| |
| imports[uri] = imports[uri].concat(media); |
| }); |
| }; |
| }; |
| |
| rule.ruleName = ruleName; |
| rule.messages = messages; |
| module.exports = rule; |