markdownlint/lib/md007.js

// @ts-check

"use strict";

const { addErrorDetailIf } = require("../helpers");
const { filterByTypes } = require("../helpers/micromark.cjs");

/**
 * @typedef {import("../helpers/micromark.cjs").Token} Token
 */

module.exports = {
  "names": [ "MD007", "ul-indent" ],
  "description": "Unordered list indentation",
  "tags": [ "bullet", "ul", "indentation" ],
  "function": function MD007(params, onError) {
    const indent = Number(params.config.indent || 2);
    const startIndented = !!params.config.start_indented;
    const startIndent = Number(params.config.start_indent || indent);
    const unorderedListNesting = new Map();
    let lastBlockQuotePrefix = null;
    const tokens = filterByTypes(
      params.parsers.micromark.tokens,
      [ "blockQuotePrefix", "listItemPrefix", "listUnordered" ]
    );
    for (const token of tokens) {
      const { parent, startColumn, startLine, type } = token;
      if (type === "blockQuotePrefix") {
        lastBlockQuotePrefix = token;
      } else if (type === "listUnordered") {
        let nesting = 0;
        /** @type {Token | null} */
        let current = token;
        while ((current = current.parent)) {
          if (current.type === "listUnordered") {
            nesting++;
          } else if (current.type === "listOrdered") {
            nesting = -1;
            break;
          } else if (current.type === "blockQuote") {
            break;
          }
        }
        if (nesting >= 0) {
          unorderedListNesting.set(token, nesting);
        }
      } else {
        // listItemPrefix
        const nesting = unorderedListNesting.get(parent);
        if (nesting !== undefined) {
          // listItemPrefix for listUnordered
          const expectedIndent =
            (startIndented ? startIndent : 0) + (nesting * indent);
          const blockQuoteAdjustment =
            (lastBlockQuotePrefix?.endLine === startLine) ?
              (lastBlockQuotePrefix.endColumn - 1) :
              0;
          const actualIndent = startColumn - 1 - blockQuoteAdjustment;
          const range = [ 1, startColumn + 1 ];
          const fixInfo = {
            "editColumn": startColumn - actualIndent,
            "deleteCount": Math.max(actualIndent - expectedIndent, 0),
            "insertText": "".padEnd(Math.max(expectedIndent - actualIndent, 0))
          };
          addErrorDetailIf(
            onError,
            startLine,
            expectedIndent,
            actualIndent,
            undefined,
            undefined,
            range,
            fixInfo
          );
        }
      }
    }
  }
};