INPUT Translation – Variable Handling and Ending

To look up the appropriate input assign code, the process final operand routine is used, which calls the find code routine that checks the token on the done stack to see if the reference flag is set since the input assign codes have the reference flag (this should not be necessary since the INPUT command uses the recently implemented reference mode). The reference variable will be popped from the done stack and the input assign code will be appended to the output before returning.

The InputAssignInt and InputAssignStr are associated codes for the InputAssign code. Once the input assign code has been appended to the output, the appropriate input parse code needs to be inserted after the input begin code or last input parse code. The easiest way to get the appropriate input parse code was to have each (InputParse, InputParseInt, and InputParseStr) be associated codes to the input assign codes. The second associated code will be used for these.

When a final semicolon token is received, the stay on line command flag is set (the same flag used for the PRINT command) and the state is set to end statement. When an end statement token is received, the INPUT command handler check if the stay flag is set and sets the keep sub-code of the INPUT command token, which is then appended to the output.

If an end statement token is received with no semicolon, the INPUT command token is immediately appended to the output without the keep sub-code. The INPUT command handler has now been implemented and the code compiles, so debugging can begin...