Identifiers & Datatypes

Upper and lowercase letters carry different meaning when at the start of a word.

A Datatype must always start with an uppercase letter, and an identifier must start with either a lowercase letter or an underscore.

Identifier

Identifier        = (underscore | lowercase_letter), identifier_letter*

identifier_letter = underscore | lowercase_letter | uppercase_letter | decimal_digit

identifier
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_identifier
_123
_many_letters
camelCase
thp

Datatype

Datatype = uppercase_letter, indentifier_letter*

Datatype
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PDO
WEIRD_DATATYPE
thp

Keywords

The following are (currently) THP keywords:

val     var     fun
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thp

Keywords are scanned first as identifiers, then transformed to their respective tokens.