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

test/lists-with-fenced-code.md

@@ -62,5 +62,5 @@ Text
 
 1. Text
    ```shell
-   fence {MD031:64} {MD031:65} {MD032:65} {MD040:66}
+   fence {MD031:64} {MD031:65} {MD031:66} {MD032:65} {MD040:66}
   ```

test/rules/every-n-lines.js

@@ -2,24 +2,19 @@
 
 "use strict";
 
-const { forEachLine, getLineMetadata } = require("../../helpers");
-
 /** @type import("../../lib/markdownlint").Rule */
 module.exports = {
   "names": [ "every-n-lines" ],
   "description": "Rule that reports an error every N lines",
   "tags": [ "test" ],
-  "parser": "markdownit",
+  "parser": "none",
   "function": (params, onError) => {
     const n = params.config.n || 2;
-    forEachLine(getLineMetadata(params), (line, lineIndex) => {
-      const lineNumber = lineIndex + 1;
-      if ((lineNumber % n) === 0) {
-        onError({
-          "lineNumber": lineNumber,
-          "detail": "Line number " + lineNumber
-        });
-      }
-    });
+    for (let lineNumber = n; lineNumber <= params.lines.length; lineNumber += n) {
+      onError({
+        "lineNumber": lineNumber,
+        "detail": "Line number " + lineNumber
+      });
+    }
   }
 };

test/snapshots/markdownlint-test-scenarios.js.md

@@ -35694,6 +35694,23 @@ Generated by [AVA](https://avajs.dev).
             'blanks-around-fences',
           ],
         },
+        {
+          errorContext: '```',
+          errorDetail: null,
+          errorRange: null,
+          fixInfo: {
+            insertText: `␊
+            `,
+            lineNumber: 66,
+          },
+          lineNumber: 66,
+          ruleDescription: 'Fenced code blocks should be surrounded by blank lines',
+          ruleInformation: 'https://github.com/DavidAnson/markdownlint/blob/v0.0.0/doc/md031.md',
+          ruleNames: [
+            'MD031',
+            'blanks-around-fences',
+          ],
+        },
         {
           errorContext: 'fence {MD031:64} {MD031:65} {M...',
           errorDetail: null,
@@ -35798,7 +35815,7 @@ Generated by [AVA](https://avajs.dev).
       1. Text␊
       ␊
          \`\`\`shell␊
-         fence {MD031:64} {MD031:65} {MD032:65} {MD040:66}␊
+         fence {MD031:64} {MD031:65} {MD031:66} {MD032:65} {MD040:66}␊
       ␊
         \`\`\`␊
       `,