func IsId(tkn Token) bool
func IsUnreservedWord(tkn Token) bool
Token is the set of lexical tokens in JavaScript (ECMA5).
type Token int
const (
ILLEGAL Token
EOF
COMMENT
STRING
NUMBER
PLUS // +
MINUS // -
MULTIPLY // *
EXPONENT // **
SLASH // /
REMAINDER // %
AND // &
OR // |
EXCLUSIVE_OR // ^
SHIFT_LEFT // <<
SHIFT_RIGHT // >>
UNSIGNED_SHIFT_RIGHT // >>>
ADD_ASSIGN // +=
SUBTRACT_ASSIGN // -=
MULTIPLY_ASSIGN // *=
EXPONENT_ASSIGN // **=
QUOTIENT_ASSIGN // /=
REMAINDER_ASSIGN // %=
AND_ASSIGN // &=
OR_ASSIGN // |=
EXCLUSIVE_OR_ASSIGN // ^=
SHIFT_LEFT_ASSIGN // <<=
SHIFT_RIGHT_ASSIGN // >>=
UNSIGNED_SHIFT_RIGHT_ASSIGN // >>>=
LOGICAL_AND // &&
LOGICAL_OR // ||
COALESCE // ??
INCREMENT // ++
DECREMENT // --
EQUAL // ==
STRICT_EQUAL // ===
LESS // <
GREATER // >
ASSIGN // =
NOT // !
BITWISE_NOT // ~
NOT_EQUAL // !=
STRICT_NOT_EQUAL // !==
LESS_OR_EQUAL // <=
GREATER_OR_EQUAL // >=
LEFT_PARENTHESIS // (
LEFT_BRACKET // [
LEFT_BRACE // {
COMMA // ,
PERIOD // .
RIGHT_PARENTHESIS // )
RIGHT_BRACKET // ]
RIGHT_BRACE // }
SEMICOLON // ;
COLON // :
QUESTION_MARK // ?
QUESTION_DOT // ?.
ARROW // =>
ELLIPSIS // ...
BACKTICK // `
PRIVATE_IDENTIFIER
IDENTIFIER
KEYWORD
BOOLEAN
NULL
IF
IN
OF
DO
VAR
FOR
NEW
TRY
THIS
ELSE
CASE
VOID
WITH
CONST
WHILE
BREAK
CATCH
THROW
CLASS
SUPER
RETURN
TYPEOF
DELETE
SWITCH
DEFAULT
FINALLY
EXTENDS
FUNCTION
CONTINUE
DEBUGGER
INSTANCEOF
ESCAPED_RESERVED_WORD
LET
STATIC
ASYNC
AWAIT
YIELD
)
func IsKeyword(literal string) (Token, bool)
IsKeyword returns the keyword token if literal is a keyword, a KEYWORD token if the literal is a future keyword (const, let, class, super, ...), or 0 if the literal is not a keyword.
If the literal is a keyword, IsKeyword returns a second value indicating if the literal is considered a future keyword in strict-mode only.
7.6.1.2 Future Reserved Words:
const class enum export extends import super
7.6.1.2 Future Reserved Words (strict):
implements interface let package private protected public static
func (tkn Token) String() string
String returns the string corresponding to the token. For operators, delimiters, and keywords the string is the actual token string (e.g., for the token PLUS, the String() is "+"). For all other tokens the string corresponds to the token name (e.g. for the token IDENTIFIER, the string is "IDENTIFIER").