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Filename : constants.js
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'use strict';

const path = require('path');
const WIN_SLASH = '\\\\/';
const WIN_NO_SLASH = `[^${WIN_SLASH}]`;

/**
 * Posix glob regex
 */

const DOT_LITERAL = '\\.';
const PLUS_LITERAL = '\\+';
const QMARK_LITERAL = '\\?';
const SLASH_LITERAL = '\\/';
const ONE_CHAR = '(?=.)';
const QMARK = '[^/]';
const END_ANCHOR = `(?:${SLASH_LITERAL}|$)`;
const START_ANCHOR = `(?:^|${SLASH_LITERAL})`;
const DOTS_SLASH = `${DOT_LITERAL}{1,2}${END_ANCHOR}`;
const NO_DOT = `(?!${DOT_LITERAL})`;
const NO_DOTS = `(?!${START_ANCHOR}${DOTS_SLASH})`;
const NO_DOT_SLASH = `(?!${DOT_LITERAL}{0,1}${END_ANCHOR})`;
const NO_DOTS_SLASH = `(?!${DOTS_SLASH})`;
const QMARK_NO_DOT = `[^.${SLASH_LITERAL}]`;
const STAR = `${QMARK}*?`;

const POSIX_CHARS = {
  DOT_LITERAL,
  PLUS_LITERAL,
  QMARK_LITERAL,
  SLASH_LITERAL,
  ONE_CHAR,
  QMARK,
  END_ANCHOR,
  DOTS_SLASH,
  NO_DOT,
  NO_DOTS,
  NO_DOT_SLASH,
  NO_DOTS_SLASH,
  QMARK_NO_DOT,
  STAR,
  START_ANCHOR
};

/**
 * Windows glob regex
 */

const WINDOWS_CHARS = {
  ...POSIX_CHARS,

  SLASH_LITERAL: `[${WIN_SLASH}]`,
  QMARK: WIN_NO_SLASH,
  STAR: `${WIN_NO_SLASH}*?`,
  DOTS_SLASH: `${DOT_LITERAL}{1,2}(?:[${WIN_SLASH}]|$)`,
  NO_DOT: `(?!${DOT_LITERAL})`,
  NO_DOTS: `(?!(?:^|[${WIN_SLASH}])${DOT_LITERAL}{1,2}(?:[${WIN_SLASH}]|$))`,
  NO_DOT_SLASH: `(?!${DOT_LITERAL}{0,1}(?:[${WIN_SLASH}]|$))`,
  NO_DOTS_SLASH: `(?!${DOT_LITERAL}{1,2}(?:[${WIN_SLASH}]|$))`,
  QMARK_NO_DOT: `[^.${WIN_SLASH}]`,
  START_ANCHOR: `(?:^|[${WIN_SLASH}])`,
  END_ANCHOR: `(?:[${WIN_SLASH}]|$)`
};

/**
 * POSIX Bracket Regex
 */

const POSIX_REGEX_SOURCE = {
  alnum: 'a-zA-Z0-9',
  alpha: 'a-zA-Z',
  ascii: '\\x00-\\x7F',
  blank: ' \\t',
  cntrl: '\\x00-\\x1F\\x7F',
  digit: '0-9',
  graph: '\\x21-\\x7E',
  lower: 'a-z',
  print: '\\x20-\\x7E ',
  punct: '\\-!"#$%&\'()\\*+,./:;<=>?@[\\]^_`{|}~',
  space: ' \\t\\r\\n\\v\\f',
  upper: 'A-Z',
  word: 'A-Za-z0-9_',
  xdigit: 'A-Fa-f0-9'
};

module.exports = {
  MAX_LENGTH: 1024 * 64,
  POSIX_REGEX_SOURCE,

  // regular expressions
  REGEX_BACKSLASH: /\\(?![*+?^${}(|)[\]])/g,
  REGEX_NON_SPECIAL_CHARS: /^[^@![\].,$*+?^{}()|\\/]+/,
  REGEX_SPECIAL_CHARS: /[-*+?.^${}(|)[\]]/,
  REGEX_SPECIAL_CHARS_BACKREF: /(\\?)((\W)(\3*))/g,
  REGEX_SPECIAL_CHARS_GLOBAL: /([-*+?.^${}(|)[\]])/g,
  REGEX_REMOVE_BACKSLASH: /(?:\[.*?[^\\]\]|\\(?=.))/g,

  // Replace globs with equivalent patterns to reduce parsing time.
  REPLACEMENTS: {
    '***': '*',
    '**/**': '**',
    '**/**/**': '**'
  },

  // Digits
  CHAR_0: 48, /* 0 */
  CHAR_9: 57, /* 9 */

  // Alphabet chars.
  CHAR_UPPERCASE_A: 65, /* A */
  CHAR_LOWERCASE_A: 97, /* a */
  CHAR_UPPERCASE_Z: 90, /* Z */
  CHAR_LOWERCASE_Z: 122, /* z */

  CHAR_LEFT_PARENTHESES: 40, /* ( */
  CHAR_RIGHT_PARENTHESES: 41, /* ) */

  CHAR_ASTERISK: 42, /* * */

  // Non-alphabetic chars.
  CHAR_AMPERSAND: 38, /* & */
  CHAR_AT: 64, /* @ */
  CHAR_BACKWARD_SLASH: 92, /* \ */
  CHAR_CARRIAGE_RETURN: 13, /* \r */
  CHAR_CIRCUMFLEX_ACCENT: 94, /* ^ */
  CHAR_COLON: 58, /* : */
  CHAR_COMMA: 44, /* , */
  CHAR_DOT: 46, /* . */
  CHAR_DOUBLE_QUOTE: 34, /* " */
  CHAR_EQUAL: 61, /* = */
  CHAR_EXCLAMATION_MARK: 33, /* ! */
  CHAR_FORM_FEED: 12, /* \f */
  CHAR_FORWARD_SLASH: 47, /* / */
  CHAR_GRAVE_ACCENT: 96, /* ` */
  CHAR_HASH: 35, /* # */
  CHAR_HYPHEN_MINUS: 45, /* - */
  CHAR_LEFT_ANGLE_BRACKET: 60, /* < */
  CHAR_LEFT_CURLY_BRACE: 123, /* { */
  CHAR_LEFT_SQUARE_BRACKET: 91, /* [ */
  CHAR_LINE_FEED: 10, /* \n */
  CHAR_NO_BREAK_SPACE: 160, /* \u00A0 */
  CHAR_PERCENT: 37, /* % */
  CHAR_PLUS: 43, /* + */
  CHAR_QUESTION_MARK: 63, /* ? */
  CHAR_RIGHT_ANGLE_BRACKET: 62, /* > */
  CHAR_RIGHT_CURLY_BRACE: 125, /* } */
  CHAR_RIGHT_SQUARE_BRACKET: 93, /* ] */
  CHAR_SEMICOLON: 59, /* ; */
  CHAR_SINGLE_QUOTE: 39, /* ' */
  CHAR_SPACE: 32, /*   */
  CHAR_TAB: 9, /* \t */
  CHAR_UNDERSCORE: 95, /* _ */
  CHAR_VERTICAL_LINE: 124, /* | */
  CHAR_ZERO_WIDTH_NOBREAK_SPACE: 65279, /* \uFEFF */

  SEP: path.sep,

  /**
   * Create EXTGLOB_CHARS
   */

  extglobChars(chars) {
    return {
      '!': { type: 'negate', open: '(?:(?!(?:', close: `))${chars.STAR})` },
      '?': { type: 'qmark', open: '(?:', close: ')?' },
      '+': { type: 'plus', open: '(?:', close: ')+' },
      '*': { type: 'star', open: '(?:', close: ')*' },
      '@': { type: 'at', open: '(?:', close: ')' }
    };
  },

  /**
   * Create GLOB_CHARS
   */

  globChars(win32) {
    return win32 === true ? WINDOWS_CHARS : POSIX_CHARS;
  }
};