Table – Command Type

The only uses of code enumerators remaining are those that will become code type enumerators and for the temporary initializers of additional alternate codes.  The replacement of the type enumerators can now begin.  As mentioned previously (see January 3), table flags will be used to identify commands, operators and functions since some of these codes will need their own code type enumerator (for example, LET, Equal, Comma and Semicolon).

The command type was first to be replaced with use of a table flag.  A Command table flag already exists and was being used for the Comma, Semicolon, and the assignment codes.  The purpose this flag is to identify that these codes can have the Colon sub-code like command codes and not the Parentheses sub-code that operators can have.  Both of these sub-codes share the same sub-code bit.

For the purposes of checking for a command type code, these other codes needed to be excluded.  An is command table entry access function was added to do this check, which first checks if the Command table flag is set.  The assignment codes all have the Reference table flag, so these are excluded by checking if this flag is not set.  For Comma and Semicolon (used as commands for PRINT statements) are treated as special operators allowing them in expressions where an operator is expected.  These are excluded by checking if the code is not an operator, which for now checks for an Operator type but will be changed to checking the new Operator flag.

A token is command table pass-through access function was also added.  When checking for the Colon and Parentheses sub-codes (in the program word stream insert operator and recreator operator functions), just the Command table flag is checked, otherwise the is command function is used (throughout the translator and tester classes).

For all of the command code table entries where the Command table flag was added, the current type initializer was changed to the default type (null).  This was necessary since the Command type was removed.  The type initializers will be replaced with code type enumerators.

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