| "use strict"; |
| const path = require("path"); |
| const reSyntaxCSS = /^(?:post)?css$/i; |
| |
| function cssSyntax () { |
| return { |
| stringify: require("postcss/lib/stringify"), |
| parse: require("postcss/lib/parse"), |
| }; |
| } |
| |
| function normalize (syntax) { |
| if (!syntax.parse) { |
| syntax = { |
| parse: syntax, |
| }; |
| } |
| return syntax; |
| } |
| |
| function requireSyntax (syntax) { |
| if (reSyntaxCSS.test(syntax)) { |
| return cssSyntax(); |
| } else if (/^sugarss$/i.test(syntax)) { |
| syntax = "sugarss"; |
| } else if (path.isAbsolute(syntax) || syntax[0] === ".") { |
| syntax = path.resolve(syntax); |
| } else { |
| syntax = syntax.toLowerCase().replace(/^(?:postcss-)?(\w+)/i, "postcss-$1"); |
| } |
| return normalize(require(syntax)); |
| } |
| |
| function getSyntax (lang, opts) { |
| let syntax; |
| lang = lang || "css"; |
| if (opts.syntax.config[lang]) { |
| syntax = opts.syntax.config[lang]; |
| if (typeof syntax === "string") { |
| if (syntax !== lang && opts.syntax.config[syntax]) { |
| return getSyntax(syntax, opts); |
| } |
| syntax = requireSyntax(syntax); |
| } else { |
| syntax = normalize(syntax); |
| } |
| } else if (reSyntaxCSS.test(lang)) { |
| syntax = cssSyntax(); |
| } else { |
| return requireSyntax(lang); |
| } |
| if (!syntax.stringify) { |
| if (reSyntaxCSS.test(lang)) { |
| syntax.stringify = require("postcss/lib/stringify"); |
| } else { |
| syntax.stringify = getSyntax(null, opts).stringify; |
| } |
| } |
| opts.syntax.config[lang] = syntax; |
| return syntax; |
| } |
| |
| module.exports = getSyntax; |