'use strict';

const utils = require('./utils');
const constants = require('./constants');

/**
 * Constants
 */

const {
  MAX_LENGTH,
  POSIX_REGEX_SOURCE,
  REGEX_NON_SPECIAL_CHAR,
  REGEX_SPECIAL_CHARS_BACKREF,
  REPLACEMENTS
} = constants;

/**
 * Helpers
 */

const expandRange = (args, options) => {
  if (typeof options.expandRange === 'function') {
    return options.expandRange(...args, options);
  }

  args.sort();
  let value = `[${args.join('-')}]`;

  try {
    /* eslint-disable no-new */
    new RegExp(value);
  } catch (ex) {
    return args.map(v => utils.escapeRegex(v)).join('..');
  }

  return value;
};

const negate = state => {
  let count = 1;

  while (state.peek() === '!' && (state.peek(2) !== '(' || state.peek(3) === '?')) {
    state.advance();
    state.start++;
    count++;
  }

  if (count % 2 === 0) {
    return false;
  }

  state.negated = true;
  state.start++;
  return true;
};

/**
 * Create the message for a syntax error
 */

const syntaxError = (type, char) => {
  return `Missing ${type}: "${char}" - use "\\\\${char}" to match literal characters`;
};

/**
 * Parse the given input string.
 * @param {String} input
 * @param {Object} options
 * @return {Object}
 */

const parse = (input, options) => {
  if (typeof input !== 'string') {
    throw new TypeError('Expected a string');
  }

  input = REPLACEMENTS[input] || input;

  let opts = { ...options };
  let max = typeof opts.maxLength === 'number' ? Math.min(MAX_LENGTH, opts.maxLength) : MAX_LENGTH;
  let len = input.length;
  if (len > max) {
    throw new SyntaxError(`Input length: ${len}, exceeds maximum allowed length: ${max}`);
  }

  let bos = { type: 'bos', value: '', output: opts.prepend || '' };
  let tokens = [bos];

  let capture = opts.capture ? '' : '?:';
  let win32 = utils.isWindows(options);

  // create constants based on platform, for windows or posix
  const PLATFORM_CHARS = constants.globChars(win32);
  const EXTGLOB_CHARS = constants.extglobChars(PLATFORM_CHARS);

  const {
    DOT_LITERAL,
    PLUS_LITERAL,
    SLASH_LITERAL,
    ONE_CHAR,
    DOTS_SLASH,
    NO_DOT,
    NO_DOT_SLASH,
    NO_DOTS_SLASH,
    QMARK,
    QMARK_NO_DOT,
    STAR,
    START_ANCHOR
  } = PLATFORM_CHARS;

  const globstar = (opts) => {
    return `(${capture}(?:(?!${START_ANCHOR}${opts.dot ? DOTS_SLASH : DOT_LITERAL}).)*?)`;
  };

  let nodot = opts.dot ? '' : NO_DOT;
  let star = opts.bash === true ? globstar(opts) : STAR;
  let qmarkNoDot = opts.dot ? QMARK : QMARK_NO_DOT;

  if (opts.capture) {
    star = `(${star})`;
  }

  // minimatch options support
  if (typeof opts.noext === 'boolean') {
    opts.noextglob = opts.noext;
  }

  let state = {
    index: -1,
    start: 0,
    consumed: '',
    output: '',
    backtrack: false,
    brackets: 0,
    braces: 0,
    parens: 0,
    quotes: 0,
    tokens
  };

  let extglobs = [];
  let stack = [];
  let prev = bos;
  let value;

  /**
   * Tokenizing helpers
   */

  const eos = () => state.index === len - 1;
  const peek = state.peek = (n = 1) => input[state.index + n];
  const advance = state.advance = () => input[++state.index];
  const append = token => {
    state.output += token.output != null ? token.output : token.value;
    state.consumed += token.value || '';
  };

  const increment = type => {
    state[type]++;
    stack.push(type);
  };

  const decrement = type => {
    state[type]--;
    stack.pop();
  };

  /**
   * Push tokens onto the tokens array. This helper speeds up
   * tokenizing by 1) helping us avoid backtracking as much as possible,
   * and 2) helping us avoid creating extra tokens when consecutive
   * characters are plain text. This improves performance and simplifies
   * lookbehinds.
   */

  const push = tok => {
    if (prev.type === 'globstar') {
      let isBrace = state.braces > 0 && (tok.type === 'comma' || tok.type === 'brace');
      let isExtglob = extglobs.length && (tok.type === 'pipe' || tok.type === 'paren');
      if (tok.type !== 'slash' && tok.type !== 'paren' && !isBrace && !isExtglob) {
        state.output = state.output.slice(0, -prev.output.length);
        prev.type = 'star';
        prev.value = '*';
        prev.output = star;
        state.output += prev.output;
      }
    }

    if (extglobs.length && tok.type !== 'paren' && !EXTGLOB_CHARS[tok.value]) {
      extglobs[extglobs.length - 1].inner += tok.value;
    }

    if (tok.value || tok.output) append(tok);
    if (prev && prev.type === 'text' && tok.type === 'text') {
      prev.value += tok.value;
      return;
    }

    tok.prev = prev;
    tokens.push(tok);
    prev = tok;
  };

  const extglobOpen = (type, value) => {
    let token = { ...EXTGLOB_CHARS[value], conditions: 1, inner: '' };

    token.prev = prev;
    token.parens = state.parens;
    token.output = state.output;
    let output = (opts.capture ? '(' : '') + token.open;

    push({ type, value, output: state.output ? '' : ONE_CHAR });
    push({ type: 'paren', extglob: true, value: advance(), output });
    increment('parens');
    extglobs.push(token);
  };

  const extglobClose = token => {
    let output = token.close + (opts.capture ? ')' : '');

    if (token.type === 'negate') {
      let extglobStar = star;

      if (token.inner && token.inner.length > 1 && token.inner.includes('/')) {
        extglobStar = globstar(opts);
      }

      if (extglobStar !== star || eos() || /^\)+$/.test(input.slice(state.index + 1))) {
        output = token.close = ')$))' + extglobStar;
      }

      if (token.prev.type === 'bos' && eos()) {
        state.negatedExtglob = true;
      }
    }

    push({ type: 'paren', extglob: true, value, output });
    decrement('parens');
  };

  if (opts.fastpaths !== false && !/(^[*!]|[/{[()\]}"])/.test(input)) {
    let backslashes = false;

    let output = input.replace(REGEX_SPECIAL_CHARS_BACKREF, (m, esc, chars, first, rest, index) => {
      if (first === '\\') {
        backslashes = true;
        return m;
      }

      if (first === '?') {
        if (esc) {
          return esc + first + (rest ? QMARK.repeat(rest.length) : '');
        }
        if (index === 0) {
          return qmarkNoDot + (rest ? QMARK.repeat(rest.length) : '');
        }
        return QMARK.repeat(chars.length);
      }

      if (first === '.') {
        return DOT_LITERAL.repeat(chars.length);
      }

      if (first === '*') {
        if (esc) {
          return esc + first + (rest ? star : '');
        }
        return star;
      }
      return esc ? m : '\\' + m;
    });

    if (backslashes === true) {
      if (opts.unescape === true) {
        output = output.replace(/\\/g, '');
      } else {
        output = output.replace(/\\+/g, m => {
          return m.length % 2 === 0 ? '\\\\' : (m ? '\\' : '');
        });
      }
    }

    state.output = output;
    return state;
  }

  /**
   * Tokenize input until we reach end-of-string
   */

  while (!eos()) {
    value = advance();

    if (value === '\u0000') {
      continue;
    }

    /**
     * Escaped characters
     */

    if (value === '\\') {
      let next = peek();

      if (next === '/' && opts.bash !== true) {
        continue;
      }

      if (next === '.' || next === ';') {
        continue;
      }

      if (!next) {
        value += '\\';
        push({ type: 'text', value });
        continue;
      }

      // collapse slashes to reduce potential for exploits
      let match = /^\\+/.exec(input.slice(state.index + 1));
      let slashes = 0;

      if (match && match[0].length > 2) {
        slashes = match[0].length;
        state.index += slashes;
        if (slashes % 2 !== 0) {
          value += '\\';
        }
      }

      if (opts.unescape === true) {
        value = advance() || '';
      } else {
        value += advance() || '';
      }

      if (state.brackets === 0) {
        push({ type: 'text', value });
        continue;
      }
    }

    /**
     * If we're inside a regex character class, continue
     * until we reach the closing bracket.
     */

    if (state.brackets > 0 && (value !== ']' || prev.value === '[' || prev.value === '[^')) {
      if (opts.posix !== false && value === ':') {
        let inner = prev.value.slice(1);
        if (inner.includes('[')) {
          prev.posix = true;

          if (inner.includes(':')) {
            let idx = prev.value.lastIndexOf('[');
            let pre = prev.value.slice(0, idx);
            let rest = prev.value.slice(idx + 2);
            let posix = POSIX_REGEX_SOURCE[rest];
            if (posix) {
              prev.value = pre + posix;
              state.backtrack = true;
              advance();

              if (!bos.output && tokens.indexOf(prev) === 1) {
                bos.output = ONE_CHAR;
              }
              continue;
            }
          }
        }
      }

      if ((value === '[' && peek() !== ':') || (value === '-' && peek() === ']')) {
        value = '\\' + value;
      }

      if (value === ']' && (prev.value === '[' || prev.value === '[^')) {
        value = '\\' + value;
      }

      if (opts.posix === true && value === '!' && prev.value === '[') {
        value = '^';
      }

      prev.value += value;
      append({ value });
      continue;
    }

    /**
     * If we're inside a quoted string, continue
     * until we reach the closing double quote.
     */

    if (state.quotes === 1 && value !== '"') {
      value = utils.escapeRegex(value);
      prev.value += value;
      append({ value });
      continue;
    }

    /**
     * Double quotes
     */

    if (value === '"') {
      state.quotes = state.quotes === 1 ? 0 : 1;
      if (opts.keepQuotes === true) {
        push({ type: 'text', value });
      }
      continue;
    }

    /**
     * Parentheses
     */

    if (value === '(') {
      push({ type: 'paren', value });
      increment('parens');
      continue;
    }

    if (value === ')') {
      if (state.parens === 0 && opts.strictBrackets === true) {
        throw new SyntaxError(syntaxError('opening', '('));
      }

      let extglob = extglobs[extglobs.length - 1];
      if (extglob && state.parens === extglob.parens + 1) {
        extglobClose(extglobs.pop());
        continue;
      }

      push({ type: 'paren', value, output: state.parens ? ')' : '\\)' });
      decrement('parens');
      continue;
    }

    /**
     * Brackets
     */

    if (value === '[') {
      if (opts.nobracket === true || !input.slice(state.index + 1).includes(']')) {
        if (opts.nobracket !== true && opts.strictBrackets === true) {
          throw new SyntaxError(syntaxError('closing', ']'));
        }

        value = '\\' + value;
      } else {
        increment('brackets');
      }

      push({ type: 'bracket', value });
      continue;
    }

    if (value === ']') {
      if (opts.nobracket === true || (prev && prev.type === 'bracket' && prev.value.length === 1)) {
        push({ type: 'text', value, output: '\\' + value });
        continue;
      }

      if (state.brackets === 0) {
        if (opts.strictBrackets === true) {
          throw new SyntaxError(syntaxError('opening', '['));
        }

        push({ type: 'text', value, output: '\\' + value });
        continue;
      }

      decrement('brackets');

      let prevValue = prev.value.slice(1);
      if (prev.posix !== true && prevValue[0] === '^' && !prevValue.includes('/')) {
        value = '/' + value;
      }

      prev.value += value;
      append({ value });

      // when literal brackets are explicitly disabled
      // assume we should match with a regex character class
      if (opts.literalBrackets === false || utils.hasRegexChars(prevValue)) {
        continue;
      }

      let escaped = utils.escapeRegex(prev.value);
      state.output = state.output.slice(0, -prev.value.length);

      // when literal brackets are explicitly enabled
      // assume we should escape the brackets to match literal characters
      if (opts.literalBrackets === true) {
        state.output += escaped;
        prev.value = escaped;
        continue;
      }

      // when the user specifies nothing, try to match both
      prev.value = `(${capture}${escaped}|${prev.value})`;
      state.output += prev.value;
      continue;
    }

    /**
     * Braces
     */

    if (value === '{' && opts.nobrace !== true) {
      push({ type: 'brace', value, output: '(' });
      increment('braces');
      continue;
    }

    if (value === '}') {
      if (opts.nobrace === true || state.braces === 0) {
        push({ type: 'text', value, output: '\\' + value });
        continue;
      }

      let output = ')';

      if (state.dots === true) {
        let arr = tokens.slice();
        let range = [];

        for (let i = arr.length - 1; i >= 0; i--) {
          tokens.pop();
          if (arr[i].type === 'brace') {
            break;
          }
          if (arr[i].type !== 'dots') {
            range.unshift(arr[i].value);
          }
        }

        output = expandRange(range, opts);
        state.backtrack = true;
      }

      push({ type: 'brace', value, output });
      decrement('braces');
      continue;
    }

    /**
     * Pipes
     */

    if (value === '|') {
      if (extglobs.length > 0) {
        extglobs[extglobs.length - 1].conditions++;
      }
      push({ type: 'text', value });
      continue;
    }

    /**
     * Commas
     */

    if (value === ',') {
      let output = value;

      if (state.braces > 0 && stack[stack.length - 1] === 'braces') {
        output = '|';
      }

      push({ type: 'comma', value, output });
      continue;
    }

    /**
     * Slashes
     */

    if (value === '/') {
      // if the beginning of the glob is "./", advance the start
      // to the current index, and don't add the "./" characters
      // to the state. This greatly simplifies lookbehinds when
      // checking for BOS characters like "!" and "." (not "./")
      if (prev.type === 'dot' && state.index === 1) {
        state.start = state.index + 1;
        state.consumed = '';
        state.output = '';
        tokens.pop();
        prev = bos; // reset "prev" to the first token
        continue;
      }

      push({ type: 'slash', value, output: SLASH_LITERAL });
      continue;
    }

    /**
     * Dots
     */

    if (value === '.') {
      if (state.braces > 0 && prev.type === 'dot') {
        if (prev.value === '.') prev.output = DOT_LITERAL;
        prev.type = 'dots';
        prev.output += value;
        prev.value += value;
        state.dots = true;
        continue;
      }

      push({ type: 'dot', value, output: DOT_LITERAL });
      continue;
    }

    /**
     * Question marks
     */

    if (value === '?') {
      if (prev && prev.type === 'paren') {
        let next = peek();
        let output = value;

        if (next === '<' && !utils.supportsLookbehinds()) {
          throw new Error('Node.js v10 or higher is required for regex lookbehinds');
        }

        if (prev.value === '(' && !/[!=<:]/.test(next) || (next === '<' && !/[!=]/.test(peek(2)))) {
          output = '\\' + value;
        }

        push({ type: 'text', value, output });
        continue;
      }

      if (opts.noextglob !== true && peek() === '(' && peek(2) !== '?') {
        extglobOpen('qmark', value);
        continue;
      }

      if (opts.dot !== true && (prev.type === 'slash' || prev.type === 'bos')) {
        push({ type: 'qmark', value, output: QMARK_NO_DOT });
        continue;
      }

      push({ type: 'qmark', value, output: QMARK });
      continue;
    }

    /**
     * Exclamation
     */

    if (value === '!') {
      if (opts.noextglob !== true && peek() === '(') {
        if (peek(2) !== '?' || !/[!=<:]/.test(peek(3))) {
          extglobOpen('negate', value);
          continue;
        }
      }

      if (opts.nonegate !== true && state.index === 0) {
        negate(state);
        continue;
      }
    }

    /**
     * Plus
     */

    if (value === '+') {
      if (opts.noextglob !== true && peek() === '(' && peek(2) !== '?') {
        extglobOpen('plus', value);
        continue;
      }

      if (prev && (prev.type === 'bracket' || prev.type === 'paren' || prev.type === 'brace')) {
        let output = prev.extglob === true ? '\\' + value : value;
        push({ type: 'plus', value, output });
        continue;
      }

      // use regex behavior inside parens
      if (state.parens > 0 && opts.regex !== false) {
        push({ type: 'plus', value });
        continue;
      }

      push({ type: 'plus', value: PLUS_LITERAL });
      continue;
    }

    /**
     * Plain text
     */

    if (value === '@') {
      if (opts.noextglob !== true && peek() === '(' && peek(2) !== '?') {
        push({ type: 'at', value, output: '' });
        continue;
      }

      push({ type: 'text', value });
      continue;
    }

    /**
     * Plain text
     */

    if (value !== '*') {
      if (value === '$' || value === '^') {
        value = '\\' + value;
      }

      let match = REGEX_NON_SPECIAL_CHAR.exec(input.slice(state.index + 1));
      if (match) {
        value += match[0];
        state.index += match[0].length;
      }

      push({ type: 'text', value });
      continue;
    }

    /**
     * Stars
     */

    if (prev && (prev.type === 'globstar' || prev.star === true)) {
      prev.type = 'star';
      prev.star = true;
      prev.value += value;
      prev.output = star;
      state.backtrack = true;
      state.consumed += value;
      continue;
    }

    if (opts.noextglob !== true && peek() === '(' && peek(2) !== '?') {
      extglobOpen('star', value);
      continue;
    }

    if (prev.type === 'star') {
      if (opts.noglobstar === true) {
        state.consumed += value;
        continue;
      }

      let prior = prev.prev;
      let before = prior.prev;
      let isStart = prior.type === 'slash' || prior.type === 'bos';
      let afterStar = before && (before.type === 'star' || before.type === 'globstar');

      if (opts.bash === true && (!isStart || (!eos() && peek() !== '/'))) {
        push({ type: 'star', value, output: '' });
        continue;
      }

      let isBrace = state.braces > 0 && (prior.type === 'comma' || prior.type === 'brace');
      let isExtglob = extglobs.length && (prior.type === 'pipe' || prior.type === 'paren');
      if (!isStart && prior.type !== 'paren' && !isBrace && !isExtglob) {
        push({ type: 'star', value, output: '' });
        continue;
      }

      // strip consecutive `/**/`
      while (input.slice(state.index + 1, state.index + 4) === '/**') {
        let after = input[state.index + 4];
        if (after && after !== '/') {
          break;
        }
        state.consumed += '/**';
        state.index += 3;
      }

      if (prior.type === 'bos' && eos()) {
        prev.type = 'globstar';
        prev.value += value;
        prev.output = globstar(opts);
        state.output = prev.output;
        state.consumed += value;
        continue;
      }

      if (prior.type === 'slash' && prior.prev.type !== 'bos' && !afterStar && eos()) {
        state.output = state.output.slice(0, -(prior.output + prev.output).length);
        prior.output = '(?:' + prior.output;

        prev.type = 'globstar';
        prev.output = globstar(opts) + '|$)';
        prev.value += value;

        state.output += prior.output + prev.output;
        state.consumed += value;
        continue;
      }

      let next = peek();
      if (prior.type === 'slash' && prior.prev.type !== 'bos' && next === '/') {
        let end = peek(2) !== void 0 ? '|$' : '';

        state.output = state.output.slice(0, -(prior.output + prev.output).length);
        prior.output = '(?:' + prior.output;

        prev.type = 'globstar';
        prev.output = `${globstar(opts)}${SLASH_LITERAL}|${SLASH_LITERAL}${end})`;
        prev.value += value;

        state.output += prior.output + prev.output;
        state.consumed += value + advance();

        push({ type: 'slash', value, output: '' });
        continue;
      }

      if (prior.type === 'bos' && next === '/') {
        prev.type = 'globstar';
        prev.value += value;
        prev.output = `(?:^|${SLASH_LITERAL}|${globstar(opts)}${SLASH_LITERAL})`;
        state.output = prev.output;
        state.consumed += value + advance();
        push({ type: 'slash', value, output: '' });
        continue;
      }

      // remove single star from output
      state.output = state.output.slice(0, -prev.output.length);

      // reset previous token to globstar
      prev.type = 'globstar';
      prev.output = globstar(opts);
      prev.value += value;

      // reset output with globstar
      state.output += prev.output;
      state.consumed += value;
      continue;
    }

    let token = { type: 'star', value, output: star };

    if (opts.bash === true) {
      token.output = '.*?';
      if (prev.type === 'bos' || prev.type === 'slash') {
        token.output = nodot + token.output;
      }
      push(token);
      continue;
    }

    if (prev && (prev.type === 'bracket' || prev.type === 'paren') && opts.regex === true) {
      token.output = value;
      push(token);
      continue;
    }

    if (state.index === state.start || prev.type === 'slash' || prev.type === 'dot') {
      if (prev.type === 'dot') {
        state.output += NO_DOT_SLASH;
        prev.output += NO_DOT_SLASH;

      } else if (opts.dot === true) {
        state.output += NO_DOTS_SLASH;
        prev.output += NO_DOTS_SLASH;

      } else {
        state.output += nodot;
        prev.output += nodot;
      }

      if (peek() !== '*') {
        state.output += ONE_CHAR;
        prev.output += ONE_CHAR;
      }
    }

    push(token);
  }

  while (state.brackets > 0) {
    if (opts.strictBrackets === true) throw new SyntaxError(syntaxError('closing', ']'));
    state.output = utils.escapeLast(state.output, '[');
    decrement('brackets');
  }

  while (state.parens > 0) {
    if (opts.strictBrackets === true) throw new SyntaxError(syntaxError('closing', ')'));
    state.output = utils.escapeLast(state.output, '(');
    decrement('parens');
  }

  while (state.braces > 0) {
    if (opts.strictBrackets === true) throw new SyntaxError(syntaxError('closing', '}'));
    state.output = utils.escapeLast(state.output, '{');
    decrement('braces');
  }

  if (opts.strictSlashes !== true && (prev.type === 'star' || prev.type === 'bracket')) {
    push({ type: 'maybe_slash', value: '', output: `${SLASH_LITERAL}?` });
  }

  // rebuild the output if we had to backtrack at any point
  if (state.backtrack === true) {
    state.output = '';

    for (let token of state.tokens) {
      state.output += token.output != null ? token.output : token.value;

      if (token.suffix) {
        state.output += token.suffix;
      }
    }
  }

  return state;
};

/**
 * Fast paths for creating regular expressions for common glob patterns.
 * This can significantly speed up processing and has very little downside
 * impact when none of the fast paths match.
 */

parse.fastpaths = (input, options) => {
  let opts = { ...options };
  let max = typeof opts.maxLength === 'number' ? Math.min(MAX_LENGTH, opts.maxLength) : MAX_LENGTH;
  let len = input.length;
  if (len > max) {
    throw new SyntaxError(`Input length: ${len}, exceeds maximum allowed length: ${max}`);
  }

  input = REPLACEMENTS[input] || input;
  let win32 = utils.isWindows(options);

  // create constants based on platform, for windows or posix
  const {
    DOT_LITERAL,
    SLASH_LITERAL,
    ONE_CHAR,
    DOTS_SLASH,
    NO_DOT,
    NO_DOTS,
    NO_DOTS_SLASH,
    STAR,
    START_ANCHOR
  } = constants.globChars(win32);

  let capture = opts.capture ? '' : '?:';
  let star = opts.bash === true ? '.*?' : STAR;
  let nodot = opts.dot ? NO_DOTS : NO_DOT;
  let slashDot = opts.dot ? NO_DOTS_SLASH : NO_DOT;

  if (opts.capture) {
    star = `(${star})`;
  }

  const globstar = (opts) => {
    return `(${capture}(?:(?!${START_ANCHOR}${opts.dot ? DOTS_SLASH : DOT_LITERAL}).)*?)`;
  };

  const create = str => {
    switch (str) {
      case '*':
        return `${nodot}${ONE_CHAR}${star}`;

      case '.*':
        return `${DOT_LITERAL}${ONE_CHAR}${star}`;

      case '*.*':
        return `${nodot}${star}${DOT_LITERAL}${ONE_CHAR}${star}`;

      case '*/*':
        return `${nodot}${star}${SLASH_LITERAL}${ONE_CHAR}${slashDot}${star}`;

      case '**':
        return nodot + globstar(opts);

      case '**/*':
        return `(?:${nodot}${globstar(opts)}${SLASH_LITERAL})?${slashDot}${ONE_CHAR}${star}`;

      case '**/*.*':
        return `(?:${nodot}${globstar(opts)}${SLASH_LITERAL})?${slashDot}${star}${DOT_LITERAL}${ONE_CHAR}${star}`;

      case '**/.*':
        return `(?:${nodot}${globstar(opts)}${SLASH_LITERAL})?${DOT_LITERAL}${ONE_CHAR}${star}`;

      default: {
        let match = /^(.*?)\.(\w+)$/.exec(str);
        if (!match) return;

        let source = create(match[1], options);
        if (!source) return;

        return source + DOT_LITERAL + match[2];
      }
    }
  };

  let output = create(input);
  if (output && opts.strictSlashes !== true) {
    output += `${SLASH_LITERAL}?`;
  }

  return output;
};

module.exports = parse;