Refactor to remove forEachLine and getLineMetadata helpers, reimplement MD012/MD018/MD020/MD031 using micromark tokens.

lib/md018.js

@@ -2,8 +2,8 @@
 
 "use strict";
 
-const { addErrorContext, forEachLine } = require("../helpers");
-const { lineMetadata } = require("./cache");
+const { addErrorContext } = require("../helpers");
+const { addRangeToSet, filterByTypes } = require("../helpers/micromark.cjs");
 
 // eslint-disable-next-line jsdoc/valid-types
 /** @type import("./markdownlint").Rule */
@@ -11,22 +11,28 @@ module.exports = {
   "names": [ "MD018", "no-missing-space-atx" ],
   "description": "No space after hash on atx style heading",
   "tags": [ "headings", "atx", "spaces" ],
-  "parser": "none",
+  "parser": "micromark",
   "function": function MD018(params, onError) {
-    forEachLine(lineMetadata(), (line, lineIndex, inCode, inFence, inTable, inItem, inBreak, inHtml) => {
-      if (!inCode &&
-        !inHtml &&
+    const { lines, parsers } = params;
+    const ignoreBlockLineNumbers = new Set();
+    for (const ignoreBlock of filterByTypes(parsers.micromark.tokens, [ "codeIndented", "codeFenced", "htmlFlow" ])) {
+      addRangeToSet(ignoreBlockLineNumbers, ignoreBlock.startLine, ignoreBlock.endLine);
+    }
+    for (const [ lineIndex, line ] of lines.entries()) {
+      if (
+        !ignoreBlockLineNumbers.has(lineIndex + 1) &&
         /^#+[^# \t]/.test(line) &&
         !/#\s*$/.test(line) &&
-        !line.startsWith("#️⃣")) {
+        !line.startsWith("#️⃣")
+      ) {
         // @ts-ignore
         const hashCount = /^#+/.exec(line)[0].length;
         addErrorContext(
           onError,
           lineIndex + 1,
           line.trim(),
-          null,
-          null,
+          undefined,
+          undefined,
           [ 1, hashCount + 1 ],
           {
             "editColumn": hashCount + 1,
@@ -34,6 +40,6 @@ module.exports = {
           }
         );
       }
-    });
+    }
   }
 };