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gw-basic-2026/docs/development.md

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Development

Development History

Version Commit Description
0.1.0 d8e8375 Expression calculator with direct mode
0.2.0 6162595 Variables, arrays, program storage, control flow
0.3.0 c2d73e9 File I/O, PRINT USING, SAVE/LOAD, MID$ assignment, graphics stubs
0.4.0 df5c308 CHAIN, RUN "file", random-access I/O (FIELD/PUT/GET), CVI/CVS/CVD/MKI$/MKS$/MKD$
0.5.0 ad21350 Full-screen TUI editor, KEY statement, Ctrl+Break, Sixel graphics, SOUND/BEEP/PLAY, DOSBox-X compat testing, project rename
0.6.0 ece018d DATE$/TIME$/TIMER, FILES, SHELL, CHDIR, MKDIR, RMDIR
0.7.0 da6b513 AUTO, RENUM (with GOTO/GOSUB patching), DELETE, COMMON, LIST range fix
0.8.0 c68167c Dynamic TUI screen buffer, --full flag, LPRINT/LLIST with --lpt
0.9.0 2a8f98b EDIT statement, ON TIMER/ON KEY event trapping, F-key escape parser fixes
0.10.0 Binary tokenized SAVE/LOAD, INKEY$ extended key sequences, golden-file regression tests, classic BASIC programs
0.11.0 DEF SEG / PEEK / POKE virtual memory, GET/PUT graphics sprites, PRINT USING fixes
0.12.0 BSAVE/BLOAD, TUI ANSI 16-color rendering, CGA graphics framebuffer PEEK/POKE, keyboard shift flags
0.13.0 VIEW/WINDOW/PALETTE graphics, PMAP function, MBF float format for CVS/CVD/MKS$/MKD$
0.14.0 MBF binary file compatibility (IEEE↔MBF at save/load boundary), fix binary loader null-byte truncation, fix DRAW M/S/A bugs, add TA/=var;/X substring
0.15.0 Hardware I/O simulator, gap-fill (100% token coverage), string pool + compacting GC, Jupyter kernel (Sixel graphics, INPUT, Pygments), ahead-of-time compiler Phase 1
0.16.0 AOT compiler: 69/69 tests pass (100%). CHAIN/COMMON/RUN "file" via runtime delegation, token embedding, string comparison, division-by-zero detection, FIELD read-back, graphics, file I/O delegation, RNG matching, dead code elimination

Tests

72 test programs in tests/programs/, plus 4 classic interactive programs in tests/classic/ (Hamurabi, Lunar Lander, Gunner, Diamond from David Ahl's BASIC Computer Games).

Run the full automated suite:

bash tests/run_tests.sh

Each test has a 5-second timeout. 67 tests have .expected golden files for output regression detection. Tests without golden comparison: datetime, on_timer, timer_stop (timing-dependent), color_test (visual), play_music (audio duration).

Compatibility Testing

Compare output against real GWBASIC.EXE running under DOSBox-X:

# Generate .expected files from GWBASIC.EXE (requires DOSBox-X Flatpak)
bash tests/run_compat.sh --generate

# Compare gwbasic output against .expected
bash tests/run_compat.sh

CI

GitHub Actions runs on every push to main and on pull requests. The workflow builds the project with PulseAudio support and runs all 66 test programs.

See .github/workflows/ci.yml.