Translation – INPUT Debugging

Several minor issues were found and corrected. When the end of the INPUT command occurs, the last input parse code has to be marked with the end sub-code. Support for reference mode also needed to be added to comma token handler.

When the EOL token was received by the INPUT command handler, it reused the token for the input assign code for the variable. Upon return from command handler, the EOL token handler proceeded to delete the EOL token (which was not the EOL token anymore). To prevent this, a check was added that if the token no longer contains an EOL code, it is assumed to have been used by the command handler and will not be deleted.

The InputBegin code was just being appended to the output, but the first variable had already been added to the output, so it was after the variable instead of at the start of the statement. This code could be inserted at the beginning of the output list, however, this would only work if the INPUT command was at the beginning of the line, which may not be the case (multiple statements per line will be supported).

So instead, the element pointer in the command item will be set to the current last item in the output list when a command is pushed to the command stack. Since this pointer can no longer be checked for null to determine if an input begin code has been added, a new input begin command flag was added, which is set once an input begin code has been added to the output.

Another problem found was that none of the input variables had their reference flag set once added to the output. The find code routine was not checking for a reference (not important) but was clearing the reference flag (a problem) since the token being checked (the input assign code) did not have its reference flag set. The reference flag of the input assign token was set before calling the process final operand routine to make the find code routine work as desired, and then cleared upon return.

The valid INPUT test statements are now working, now on to the INPUT PROMPT statements, which are not working...