Operator

Operator      = operator_char+

operator_char = "+" | "-" | "=" | "*" | "!" | "/" | "|"
              | "@" | "#" | "$" | "~" | "%" | "&" | "?"
              | "<" | ">" | "^" | "." | ":"

+ - / * % < > <= >= -> =>thp

Syntax error: Expected an statement or an expresion at the top level. at line 1:0

These are all the characters that can make an operator.

The lexer doesn’t know about any operator in particular. In other languages something like +-1 would be interpreted as + - 1. In THP, this is always +- 1, and that would throw an error because the operator +- doesn’t exist.

Comma

Comma is its own token: ,.