MZC/KnowMathBot/frontend/node_modules/micromark-factory-label/index.js

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

import { markdownLineEnding, markdownSpace } from 'micromark-util-character';
/**
 * Parse labels.
 *
 * > 👉 **Note**: labels in markdown are capped at 999 characters in the string.
 *
 * ###### Examples
 *
 * ```markdown
 * [a]
 * [a
 * b]
 * [a\]b]
 * ```
 *
 * @this {TokenizeContext}
 *   Tokenize context.
 * @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 label (`[a]`).
 * @param {TokenType} markerType
 *   Type for the markers (`[` and `]`).
 * @param {TokenType} stringType
 *   Type for the identifier (`a`).
 * @returns {State}
 *   Start state.
 */
export function factoryLabel(effects, ok, nok, type, markerType, stringType) {
  const self = this;
  let size = 0;
  /** @type {boolean} */
  let seen;
  return start;

  /**
   * Start of label.
   *
   * ```markdown
   * > | [a]
   *     ^
   * ```
   *
   * @type {State}
   */
  function start(code) {
    effects.enter(type);
    effects.enter(markerType);
    effects.consume(code);
    effects.exit(markerType);
    effects.enter(stringType);
    return atBreak;
  }

  /**
   * In label, at something, before something else.
   *
   * ```markdown
   * > | [a]
   *      ^
   * ```
   *
   * @type {State}
   */
  function atBreak(code) {
    if (size > 999 || code === null || code === 91 || code === 93 && !seen ||
    // To do: remove in the future once we’ve switched from
    // `micromark-extension-footnote` to `micromark-extension-gfm-footnote`,
    // which doesn’t need this.
    // Hidden footnotes hook.
    /* c8 ignore next 3 */
    code === 94 && !size && '_hiddenFootnoteSupport' in self.parser.constructs) {
      return nok(code);
    }
    if (code === 93) {
      effects.exit(stringType);
      effects.enter(markerType);
      effects.consume(code);
      effects.exit(markerType);
      effects.exit(type);
      return ok;
    }

    // To do: indent? Link chunks and EOLs together?
    if (markdownLineEnding(code)) {
      effects.enter("lineEnding");
      effects.consume(code);
      effects.exit("lineEnding");
      return atBreak;
    }
    effects.enter("chunkString", {
      contentType: "string"
    });
    return labelInside(code);
  }

  /**
   * In label, in text.
   *
   * ```markdown
   * > | [a]
   *      ^
   * ```
   *
   * @type {State}
   */
  function labelInside(code) {
    if (code === null || code === 91 || code === 93 || markdownLineEnding(code) || size++ > 999) {
      effects.exit("chunkString");
      return atBreak(code);
    }
    effects.consume(code);
    if (!seen) seen = !markdownSpace(code);
    return code === 92 ? labelEscape : labelInside;
  }

  /**
   * After `\`, at a special character.
   *
   * ```markdown
   * > | [a\*a]
   *        ^
   * ```
   *
   * @type {State}
   */
  function labelEscape(code) {
    if (code === 91 || code === 92 || code === 93) {
      effects.consume(code);
      size++;
      return labelInside;
    }
    return labelInside(code);
  }
}