InputElement:
  WhiteSpace
  Comment
  Token

Token:
  Identifier
  Keyword
  Literal
  Separator
  Operator

Comment:
  TraditionalComment
  EndOfLineComment

TraditionalComment:
  / * CommentTail

CommentTail:
  * CommentTailStar
  NotStar CommentTail

CommentTailStar:
  /
  * CommentTailStar
  NotStarNotSlash CommentTail

NotStar:
  InputCharacter but not *
  LineTerminator

NotStarNotSlash:
  InputCharacter but not * or /
  LineTerminator

EndOfLineComment:
  / / {InputCharacter}

Identifier:
  IdentifierChars but not Keyword or BooleanLiteral or NullLiteral

IdentifierChars:
  JavaLetter {JavaLetterOrDigit}

Keyword:
  abstract
  continue
  for
  new
  switch
  assert
  default
  if
  package
  synchronized
  boolean
  do
  goto
  private
  this
  break
  double
  implements
  protected
  throw
  byte
  else
  import
  public
  throws
  case
  enum
  instanceof
  return
  transient
  catch
  extends
  int
  short
  try
  char
  final
  interface
  static
  void
  class
  finally
  long
  strictfp
  volatile
  const
  float
  native
  super
  while

Literal:
  IntegerLiteral
  FloatingPointLiteral
  BooleanLiteral
  CharacterLiteral
  StringLiteral
  NullLiteral

IntegerLiteral:
  DecimalIntegerLiteral
  HexIntegerLiteral
  OctalIntegerLiteral
  BinaryIntegerLiteral

DecimalIntegerLiteral:
  DecimalNumeral [IntegerTypeSuffix]

HexIntegerLiteral:
  HexNumeral [IntegerTypeSuffix]

OctalIntegerLiteral:
  OctalNumeral [IntegerTypeSuffix]

BinaryIntegerLiteral:
  BinaryNumeral [IntegerTypeSuffix]

IntegerTypeSuffix:
  l
  L

DecimalNumeral:
  0
  NonZeroDigit [Digits]
  NonZeroDigit Underscores Digits

NonZeroDigit:
  1
  2
  3
  4
  5
  6
  7
  8
  9

Digits:
  Digit
  Digit [DigitsAndUnderscores] Digit

Digit:
  0
  NonZeroDigit

DigitsAndUnderscores:
  DigitOrUnderscore {DigitOrUnderscore}

DigitOrUnderscore:
  Digit
  _

Underscores:
  _ {_}

HexNumeral:
  0 x HexDigits
  0 X HexDigits

HexDigits:
  HexDigit
  HexDigit [HexDigitsAndUnderscores] HexDigit

HexDigit:
  0
  1
  2
  3
  4
  5
  6
  7
  8
  9
  a
  b
  c
  d
  e
  f
  A
  B
  C
  D
  E
  F

HexDigitsAndUnderscores:
  HexDigitOrUnderscore {HexDigitOrUnderscore}

HexDigitOrUnderscore:
  HexDigit
  _

OctalNumeral:
  0 OctalDigits
  0 Underscores OctalDigits

OctalDigits:
  OctalDigit
  OctalDigit [OctalDigitsAndUnderscores] OctalDigit

OctalDigit:
  0
  1
  2
  3
  4
  5
  6
  7

OctalDigitsAndUnderscores:
  OctalDigitOrUnderscore {OctalDigitOrUnderscore}

OctalDigitOrUnderscore:
  OctalDigit
  _

BinaryNumeral:
  0 b BinaryDigits
  0 B BinaryDigits

BinaryDigits:
  BinaryDigit
  BinaryDigit [BinaryDigitsAndUnderscores] BinaryDigit

BinaryDigit:
  0
  1

BinaryDigitsAndUnderscores:
  BinaryDigitOrUnderscore {BinaryDigitOrUnderscore}

BinaryDigitOrUnderscore:
  BinaryDigit
  _

FloatingPointLiteral:
  DecimalFloatingPointLiteral
  HexadecimalFloatingPointLiteral

DecimalFloatingPointLiteral:
  Digits . [Digits] [ExponentPart] [FloatTypeSuffix]
  . Digits [ExponentPart] [FloatTypeSuffix]
  Digits ExponentPart [FloatTypeSuffix]
  Digits [ExponentPart] FloatTypeSuffix

ExponentPart:
  ExponentIndicator SignedInteger

ExponentIndicator:
  e
  E

SignedInteger:
  [Sign] Digits

Sign:
  +
  -

FloatTypeSuffix:
  f
  F
  d
  D

HexadecimalFloatingPointLiteral:
  HexSignificand BinaryExponent [FloatTypeSuffix]

HexSignificand:
  HexNumeral [.]
  0 x [HexDigits] . HexDigits
  0 X [HexDigits] . HexDigits

BinaryExponent:
  BinaryExponentIndicator SignedInteger

BinaryExponentIndicator:
  p
  P

BooleanLiteral:
  true
  false

CharacterLiteral:
  ' SingleCharacter '
  ' EscapeSequence '

SingleCharacter:
  InputCharacter but not ' or \

StringLiteral:
  " {StringCharacter} "

StringCharacter:
  InputCharacter but not " or \
  EscapeSequence

EscapeSequence:
  \ b
  \ t
  \ n
  \ f
  \ r
  \ "
  \ '
  \ \
  OctalEscape

OctalEscape:
  \ OctalDigit
  \ OctalDigit OctalDigit
  \ ZeroToThree OctalDigit OctalDigit

ZeroToThree:
  0
  1
  2
  3

NullLiteral:
  null

Separator:
  (
  )
  {
  }
  [
  ]
  ;
  ,
  .
  ...
  @
  ::

Operator:
  =
  >
  <
  !
  ~
  ?
  :
  ->
  ==
  >=
  <=
  !=
  &&
  ||
  ++
  --
  +
  -
  *
  /
  &
  |
  ^
  %
  <<
  >>
  >>>
  +=
  -=
  *=
  /=
  &=
  |=
  ^=
  %=
  <<=
  >>=
  >>>=