Translator – End Statement State

Once a semicolon is received at the end of an INPUT statement, no more tokens should be received except for an end-of-statement token. If another token is received, then an error should be reported. To accomplish this, a new end statement state similar to the end expression state is needed. While the end expression state only needs to be checked when operators are expected, the end statement state needs to be checked for all tokens.

The end statement state check was added just before the check for operand or first operand state in the main translator add token routine. When in end statement state, if the token does not have the end statement flag set in its table entry, then an “expected end-of-statement” error is reported against the token.

The access function for getting the table entry flags for a token already checks if the token has a table entry, and if there is not table entry, then zero (no flags) is returned. Currently only the EOL code has the end statement flag set, but eventually the Colon, ELSE and ENDIF tokens will also and possibly other codes.