Loki/frontend/node_modules/micromark-factory-destination/index.js

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

import { asciiControl, markdownLineEndingOrSpace, markdownLineEnding } from 'micromark-util-character';
/**
 * Parse destinations.
 *
 * ###### Examples
 *
 * ```markdown
 * <a>
 * <a\>b>
 * <a b>
 * <a)>
 * a
 * a\)b
 * a(b)c
 * 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 for whole (`<a>` or `b`).
 * @param {TokenType} literalType
 *   Type when enclosed (`<a>`).
 * @param {TokenType} literalMarkerType
 *   Type for enclosing (`<` and `>`).
 * @param {TokenType} rawType
 *   Type when not enclosed (`b`).
 * @param {TokenType} stringType
 *   Type for the value (`a` or `b`).
 * @param {number | undefined} [max=Infinity]
 *   Depth of nested parens (inclusive).
 * @returns {State}
 *   Start state.
 */
export function factoryDestination(effects, ok, nok, type, literalType, literalMarkerType, rawType, stringType, max) {
  const limit = max || Number.POSITIVE_INFINITY;
  let balance = 0;
  return start;

  /**
   * Start of destination.
   *
   * ```markdown
   * > | <aa>
   *     ^
   * > | aa
   *     ^
   * ```
   *
   * @type {State}
   */
  function start(code) {
    if (code === 60) {
      effects.enter(type);
      effects.enter(literalType);
      effects.enter(literalMarkerType);
      effects.consume(code);
      effects.exit(literalMarkerType);
      return enclosedBefore;
    }

    // ASCII control, space, closing paren.
    if (code === null || code === 32 || code === 41 || asciiControl(code)) {
      return nok(code);
    }
    effects.enter(type);
    effects.enter(rawType);
    effects.enter(stringType);
    effects.enter("chunkString", {
      contentType: "string"
    });
    return raw(code);
  }

  /**
   * After `<`, at an enclosed destination.
   *
   * ```markdown
   * > | <aa>
   *      ^
   * ```
   *
   * @type {State}
   */
  function enclosedBefore(code) {
    if (code === 62) {
      effects.enter(literalMarkerType);
      effects.consume(code);
      effects.exit(literalMarkerType);
      effects.exit(literalType);
      effects.exit(type);
      return ok;
    }
    effects.enter(stringType);
    effects.enter("chunkString", {
      contentType: "string"
    });
    return enclosed(code);
  }

  /**
   * In enclosed destination.
   *
   * ```markdown
   * > | <aa>
   *      ^
   * ```
   *
   * @type {State}
   */
  function enclosed(code) {
    if (code === 62) {
      effects.exit("chunkString");
      effects.exit(stringType);
      return enclosedBefore(code);
    }
    if (code === null || code === 60 || markdownLineEnding(code)) {
      return nok(code);
    }
    effects.consume(code);
    return code === 92 ? enclosedEscape : enclosed;
  }

  /**
   * After `\`, at a special character.
   *
   * ```markdown
   * > | <a\*a>
   *        ^
   * ```
   *
   * @type {State}
   */
  function enclosedEscape(code) {
    if (code === 60 || code === 62 || code === 92) {
      effects.consume(code);
      return enclosed;
    }
    return enclosed(code);
  }

  /**
   * In raw destination.
   *
   * ```markdown
   * > | aa
   *     ^
   * ```
   *
   * @type {State}
   */
  function raw(code) {
    if (!balance && (code === null || code === 41 || markdownLineEndingOrSpace(code))) {
      effects.exit("chunkString");
      effects.exit(stringType);
      effects.exit(rawType);
      effects.exit(type);
      return ok(code);
    }
    if (balance < limit && code === 40) {
      effects.consume(code);
      balance++;
      return raw;
    }
    if (code === 41) {
      effects.consume(code);
      balance--;
      return raw;
    }

    // ASCII control (but *not* `\0`) and space and `(`.
    // Note: in `markdown-rs`, `\0` exists in codes, in `micromark-js` it
    // doesn’t.
    if (code === null || code === 32 || code === 40 || asciiControl(code)) {
      return nok(code);
    }
    effects.consume(code);
    return code === 92 ? rawEscape : raw;
  }

  /**
   * After `\`, at special character.
   *
   * ```markdown
   * > | a\*a
   *       ^
   * ```
   *
   * @type {State}
   */
  function rawEscape(code) {
    if (code === 40 || code === 41 || code === 92) {
      effects.consume(code);
      return raw;
    }
    return raw(code);
  }
}