@fastly/as-url/assembly/charcode.ts

// Copyright 2021 Fastly, Inc.

/**
 * Define our charcodes that will be used to determine if a character needs to be URL encoded
 * See the Percent encode set in the WHatWG URL Pecent Encoding: https://url.spec.whatwg.org/#path-percent-encode-set
 * These charcodes can be found in the man pages for ascii(7)
 */
export class CHARCODE {
  static NULL: i32 = 0;
  static TAB: i32 = 9;
  static LINE_FEED: i32 = 10;
  static CARRIAGE_RETURN: i32 = 13;
  static UNIT_SEPERATOR: i32 = 31;
  static SPACE: i32 = 32;
  static EXCLAMATION_POINT: i32 = 33;
  static DOUBLE_QUOTE: i32 = 34;
  static HASHTAG: i32 = 35;
  static PERCENT: i32 = 37;
  static SINGLE_QUOTE: i32 = 39;
  static ASTERISK: i32 = 42;
  static PERIOD: i32 = 46;
  static SLASH: i32 = 47;
  static ZERO: i32 = 48;
  static NINE: i32 = 57;
  static COLON: i32 = 58;
  static SEMI_COLON: i32 = 59;
  static LESS_THAN: i32 = 60;
  static EQUALS: i32 = 61;
  static GREATER_THAN: i32 = 62;
  static QUESTION_MARK: i32 = 63;
  static AT_SIGN: i32 = 64;
  static UPPERCASE_A: i32 = 65;
  static UPPERCASE_Z: i32 = 90;
  static LEFT_BRACKET: i32 = 91;
  static BACKSLASH: i32 = 92;
  static CARET: i32 = 94;
  static GRAVE_ACCENT: i32 = 96;
  static LOWERCASE_A: i32 = 97;
  static LOWERCASE_Z: i32 = 122;
  static LEFT_CURLY_BRACKET: i32 = 123;
  static VERTICAL_BAR: i32 = 124;
  static RIGHT_CURLY_BRACKET: i32 = 125;
  static TILDE: i32 = 126;
}

export function isCZeroControlPercentEncodeSet(charcode: i32): boolean {
  if (charcode <= CHARCODE.UNIT_SEPERATOR) {
    return true;
  } else if (charcode > CHARCODE.TILDE) {
    return true;
  }

  return false;
}

export function isFragmentPercentEncodeSet(charcode: i32): boolean {
  if (isCZeroControlPercentEncodeSet(charcode)) {
    return true;
  } else if (
    charcode === CHARCODE.SPACE ||
    charcode === CHARCODE.DOUBLE_QUOTE ||
    charcode === CHARCODE.LESS_THAN ||
    charcode === CHARCODE.GREATER_THAN ||
    charcode === CHARCODE.GRAVE_ACCENT
  ) {
    return true;
  }
  return false;
}

export function isQueryPercentEncodeSet(charcode: i32): boolean {
  if (isCZeroControlPercentEncodeSet(charcode)) {
    return true;
  } else if (
    charcode === CHARCODE.SPACE ||
    charcode === CHARCODE.DOUBLE_QUOTE ||
    charcode === CHARCODE.HASHTAG ||
    charcode === CHARCODE.LESS_THAN ||
    charcode === CHARCODE.GREATER_THAN
  ) {
    return true;
  }

  return false;
}

export function isPathPercentEncodeSet(charcode: i32): boolean {
  if (isQueryPercentEncodeSet(charcode)) {
    return true;
  } else if (
    charcode === CHARCODE.QUESTION_MARK ||
    charcode === CHARCODE.GRAVE_ACCENT ||
    charcode === CHARCODE.LEFT_CURLY_BRACKET ||
    charcode === CHARCODE.RIGHT_CURLY_BRACKET
  ) {
    return true;
  }

  return false;
}

export function isUserInfoPercentEncodeSet(charcode: i32): boolean {
  if (isPathPercentEncodeSet(charcode)) {
    return true;
  } else if (
    charcode === CHARCODE.SLASH ||
    charcode === CHARCODE.COLON ||
    charcode === CHARCODE.SEMI_COLON ||
    charcode === CHARCODE.EQUALS ||
    charcode === CHARCODE.AT_SIGN ||
    charcode === CHARCODE.CARET ||
    charcode === CHARCODE.VERTICAL_BAR
  ) {
    return true;
  }

  return false;
}