3 const remark = require("remark");
4 const findAllAfter = require("unist-util-find-all-after");
6 module.exports = function (source, opts) {
7 // Skip known non-markdown files.
8 if (opts.from && !/\.(?:md|markdown)(?:\?.+)?$/i.test(opts.from)) {
11 let isStructureMD = false;
12 const ast = remark().parse(source);
13 const blocks = findAllAfter(ast, 0, (node) => {
14 if (node.type === "code" && node.lang) {
16 return /^(?:(?:[ps]?c)|le|wx|sa?|sugar)ss$/i.test(node.lang);
24 return blocks.map((block) => {
25 const startIndex = source.indexOf(block.value, block.position.start.offset);
26 const content = source.slice(startIndex, block.position.end.offset).replace(/[ \t]*`*$/, "");
28 startIndex: startIndex,
29 lang: block.lang.toLowerCase(),