markdownlint/lib/md033.js

// @ts-check

"use strict";

const { addError } = require("../helpers");
const { filterByTypes, parse } = require("../helpers/micromark.cjs");

// eslint-disable-next-line regexp/optimal-quantifier-concatenation
const htmlTextRe = /^<([^!/\s>]+)[^\r\n>]*>?/;

module.exports = {
  "names": [ "MD033", "no-inline-html" ],
  "description": "Inline HTML",
  "tags": [ "html" ],
  "function": function MD033(params, onError) {
    let allowedElements = params.config.allowed_elements;
    allowedElements = Array.isArray(allowedElements) ? allowedElements : [];
    allowedElements = allowedElements.map((element) => element.toLowerCase());
    const pending = [ [ 0, params.parsers.micromark ] ];
    let current = null;
    while ((current = pending.shift())) {
      const [ offset, tokens ] = current;
      for (const token of filterByTypes(tokens, "htmlFlow", "htmlText")) {
        if (token.type === "htmlText") {
          const match = htmlTextRe.exec(token.text);
          if (match) {
            const [ tag, element ] = match;
            if (!allowedElements.includes(element.toLowerCase())) {
              addError(
                onError,
                token.startLine + offset,
                "Element: " + element,
                undefined,
                [ token.startColumn, tag.length ]
              );
            }
          }
        } else {
          // token.type === "htmlFlow"
          // Re-parse without "htmlFlow" to get only "htmlText" tokens
          const options = {
            "extensions": [
              {
                "disable": {
                  "null": [ "htmlFlow" ]
                }
              }
            ]
          };
          const flowTokens = parse(token.text, options);
          pending.push(
            [ token.startLine - 1, flowTokens ]
          );
        }
      }
    }
  }
};