Enable QBasic console mode usage and fix bugs in newline handling
differences with C64 basic (cbm). To enable console mode for QBasic
programs, have basicpp.py prefix the output with the QB64 specific
console activation variables/functions.
One change to basicpp.py to make this change more straightfowards is
recursive includes so that includes can appear in more than just the
top level step files. This allows us to conditionally include the
right readline implementation. For QBasic in the special console mode
(instead of the default full-screen UI mode) we need to use the LINE
INPUT command in order to read input.
- simplify DO_CONCAT.
- inline MAL_READ/PRINT.
- comment out memory debug/sanity checks.
- more aggressive space removal.
Saves over 900 bytes.
Increase Z% value memory by 374 to 9216 (8192+1024).
Uses stack PUSH*/POP*/PEEK* routines instead of direct X% and Y%
access. Seems to be about the same performance (maybe a 5% performance
hit at most).
This gives us a larger stack (1920 2-byte words of $C000 rather
than 200 words as before). The release stack at $CF00 stays the same
size (64 4-byte addr/level entries).
Also saves over 1K or program and array space. So take the opportunity
to expand Z% entry space from 3712 to 3950.
- Do the pop of CALL return value at the end of the subroutine
(callee) rather than at the call point (caller)
- shorten some character variables (CH$->C$, CH->C)
- remove spaces after OPEN, GET
- print REPL header directly in BASIC code
Together saves 404 bytes of memory.
step4 runs out of space attempting to load the program. Step2 and
step3 run out of memory (stack exhaustion) for more complicated forms.
- Use GOTO with return label on our stack instead of GOSUB for:
- APPLY function in types.in.bas
- "apply", "map" and "swap!" core functions
- Implement DO TCO. Change EVAL_AST to detect if we are called from DO
and exit one element early.
- Remove GOSUB recursion from EQUAL_Q
- Inline PAIR_Q. Reduce REPLACE stack use.
- Remove one level of GOSUB/stack by calling REP with GOTO
- Simplify mal/step2_eval.mal to remove use of (or ) macro in
eval_ast.
- Fix ON GOTO/GOSUB line detection in basicpp
- Add read-file which is similar to read-string but from a file name
rather than a string. This allows steps 0-2 to load although each
one eventuall crashes with out of memory after evaluating "123"
a few times.
- basicpp:
- Renumber the line numbers so they are ordinally increasing. This
saves 150 or so bytes because GOTO/GOSUB calls have smaller line
numbers.
- Shrink 'IF 123' -> 'IF123' for almost 300 byte savings.[:w
- Simplify PR_MEMORY_SUMMARY output. Save 75 bytes
- Add missing runtest.py change that allows basic tests to pass.
