markdownlint/lib/md020.js

// @ts-check

"use strict";

const { addErrorContext, forEachLine, rangeFromRegExp } = require("../helpers");
const { lineMetadata } = require("./cache");

const atxClosedHeadingNoSpaceRe = /(?:^#+[^#\s])|(?:[^#\s]#+\s*$)/;

module.exports = {
  "names": [ "MD020", "no-missing-space-closed-atx" ],
  "description": "No space inside hashes on closed atx style heading",
  "tags": [ "headings", "headers", "atx_closed", "spaces" ],
  "function": function MD020(params, onError) {
    forEachLine(lineMetadata(), (line, lineIndex, inCode) => {
      if (!inCode && /^#+[^#]*[^\\]#+$/.test(line)) {
        const left = /^#+[^#\s]/.test(line);
        const right = /[^#\s]#+$/.test(line);
        if (left || right) {
          addErrorContext(onError, lineIndex + 1, line.trim(), left,
            right, rangeFromRegExp(line, atxClosedHeadingNoSpaceRe));
        }
      }
    });
  }
};