[Parser] Token classification (#4699)

Add methods to `Token` for determining whether the token can be interpreted as a
particular token type, returning the interpreted value as appropriate. These
methods perform additional bounds checks for integers and NaN payloads that
could not be done during the initial lexing because the lexer did not know what
the intended token type was. The float methods also reinterpret integer tokens
as floating point tokens since the float grammar is a superset of the integer
grammar and inject the NaN payloads into parsed NaN values.

Move all bounds checking to these new classifier functions to have it in one
place.

0 files changed, 0 insertions, 0 deletions