HelpProject/frontend/node_modules/micromark-factory-title/index.js

/**
 * @import {
 *   Code,
 *   Effects,
 *   State,
 *   TokenType
 * } from 'micromark-util-types'
 */

import { factorySpace } from 'micromark-factory-space';
import { markdownLineEnding } from 'micromark-util-character';
/**
 * Parse titles.
 *
 * ###### Examples
 *
 * ```markdown
 * "a"
 * 'b'
 * (c)
 * "a
 * b"
 * 'a
 *     b'
 * (a\)b)
 * ```
 *
 * @param {Effects} effects
 *   Context.
 * @param {State} ok
 *   State switched to when successful.
 * @param {State} nok
 *   State switched to when unsuccessful.
 * @param {TokenType} type
 *   Type of the whole title (`"a"`, `'b'`, `(c)`).
 * @param {TokenType} markerType
 *   Type for the markers (`"`, `'`, `(`, and `)`).
 * @param {TokenType} stringType
 *   Type for the value (`a`).
 * @returns {State}
 *   Start state.
 */
export function factoryTitle(effects, ok, nok, type, markerType, stringType) {
  /** @type {NonNullable<Code>} */
  let marker;
  return start;

  /**
   * Start of title.
   *
   * ```markdown
   * > | "a"
   *     ^
   * ```
   *
   * @type {State}
   */
  function start(code) {
    if (code === 34 || code === 39 || code === 40) {
      effects.enter(type);
      effects.enter(markerType);
      effects.consume(code);
      effects.exit(markerType);
      marker = code === 40 ? 41 : code;
      return begin;
    }
    return nok(code);
  }

  /**
   * After opening marker.
   *
   * This is also used at the closing marker.
   *
   * ```markdown
   * > | "a"
   *      ^
   * ```
   *
   * @type {State}
   */
  function begin(code) {
    if (code === marker) {
      effects.enter(markerType);
      effects.consume(code);
      effects.exit(markerType);
      effects.exit(type);
      return ok;
    }
    effects.enter(stringType);
    return atBreak(code);
  }

  /**
   * At something, before something else.
   *
   * ```markdown
   * > | "a"
   *      ^
   * ```
   *
   * @type {State}
   */
  function atBreak(code) {
    if (code === marker) {
      effects.exit(stringType);
      return begin(marker);
    }
    if (code === null) {
      return nok(code);
    }

    // Note: blank lines can’t exist in content.
    if (markdownLineEnding(code)) {
      // To do: use `space_or_tab_eol_with_options`, connect.
      effects.enter("lineEnding");
      effects.consume(code);
      effects.exit("lineEnding");
      return factorySpace(effects, atBreak, "linePrefix");
    }
    effects.enter("chunkString", {
      contentType: "string"
    });
    return inside(code);
  }

  /**
   *
   *
   * @type {State}
   */
  function inside(code) {
    if (code === marker || code === null || markdownLineEnding(code)) {
      effects.exit("chunkString");
      return atBreak(code);
    }
    effects.consume(code);
    return code === 92 ? escape : inside;
  }

  /**
   * After `\`, at a special character.
   *
   * ```markdown
   * > | "a\*b"
   *      ^
   * ```
   *
   * @type {State}
   */
  function escape(code) {
    if (code === marker || code === 92) {
      effects.consume(code);
      return inside;
    }
    return inside(code);
  }
}