An AKGL build of `basic` was a terminal program with unused SDL linked into
it. It now opens the reference's 800x600 window, draws BASIC output in the
Commodore font, pumps events, lets you type at it, and still mirrors every
byte to stdout.
The stdout mirror is a composing sink rather than a second write inside the
interpreter, and lives in the core library where it needs no SDL. The line
editor waits for a typed line by borrowing one frame at a time from the host,
so nothing blocks and nothing owns an event loop it should not.
The whole golden corpus now runs through the SDL binary as well as the stdio
one, byte for byte.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Rebasing the defect filing onto libakgl's origin/main brought two upstream
commits with it -- "Consume libakstdlib 0.2.0" and "Bump libakgl to 0.2.0" --
and libakgl's sources now use the 0.2.0 akstdlib API. Our CMakeLists declares
akstdlib::akstdlib from our own tree first, so libakgl was compiling 0.2.0-era
code against 0.1.0 headers and failing on aksl_fwrite, aksl_fread and
aksl_realpath. The two have to move together.
The code change is one call site. aksl_fwrite now takes a required size_t
*nmemb_out and reports a short transfer as AKERR_IO rather than a silent
success, so DSAVE onto a full disk is an error a program sees where before it
reported nothing. The count is passed and discarded on purpose: the library does
the noticing now.
The documentation change is larger, because libakstdlib 0.2.0 fixed all six of
the confirmed defects TODO.md section 1.9 was built around. That section was a
table of bans; leaving it would send an agent around a workaround for functions
that now work. The aksl_ato* family raises AKERR_VALUE on no digits or trailing
junk and ERANGE on overflow -- exactly the contract that section demanded --
aksl_list_append no longer truncates, aksl_list_iterate no longer skips the
first half, AKERR_ITERATOR_BREAK stops a tree traversal, and aksl_realpath no
longer reads uninitialised memory. One caveat survives: aksl_strhash_djb2 still
sign-extends char, which section 1.3 already covers and the symbol tables still
cannot reach.
src/convert.c has therefore outlived its reason, and is deliberately left in
place. Its own note said to delete it when libakstdlib grew the contract, and
that condition is now met -- but doing it touches four call sites, changes the
raised status from AKBASIC_ERR_VALUE to AKERR_VALUE where section 1.8 says
message text is part of the acceptance contract, and would silently gut the CI
mutation job, which is bounded to src/convert.c and src/symtab.c. Section 1.9
now lists all of that. Worth doing on purpose rather than as a side effect of a
version bump.
libakgl defect #14 is closed by its own 1066ac7, which bumped it to 0.2.0 while
this was being written. The requirement is no longer pinned by submodule commit
in the README, because AKGL_VERSION_AT_LEAST(0, 2, 0) finally means something.
70/70 core, 71/71 with libakgl, 70/70 under ASan+UBSan, clean under
-Wall -Wextra, doxygen clean.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Records the filing in TODO.md section 7 alongside the FILTER gap, and names the
four workarounds this repository carries against them -- the embedded-dependency
CMake trick, the akgl/actor.h include ahead of akgl/controller.h, and the
hand-populated render vtable with its NULL-deref hazard. Each is commented at its
site with the words "filed upstream" so it can be found and deleted when the
fixes land.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
All four capability gaps filed against libakgl have landed upstream, so nothing
in this repository is waiting on that library any more.
text measurement -> akgl_text_measure, akgl_text_measure_wrapped
immediate drawing -> akgl_draw_point/_line/_rect/_filled_rect/_circle/
_flood_fill/_copy_region/_paste_region
audio -> akgl_audio_init/_tone/_envelope/_waveform/_volume/
_stop/_voice_active/_mix
console input -> akgl_controller_poll_key, akgl_controller_flush_keys
The signatures came back close to what was filed, and two details are worth
recording for whoever writes src/sink_akgl.c next. The draw calls take an
akgl_RenderBackend * as their first argument rather than reaching for a global
renderer, which fits goal 3's rule that the interpreter draws through whatever
renderer the host already initialized. And the audio API is a synthesised-voice
one -- a tone on a numbered voice plus a separate ADSR envelope -- which is the
shape PLAY and ENVELOPE actually need, rather than the sample playback
SDL3_mixer would have offered.
Checked rather than assumed: libakgl's status band is still 256-260, so the
coordinated range map in CLAUDE.md is unaffected and akbasic's 512-767 does not
move.
Documentation that described these as open is corrected in the same commit --
section 7's gap list, section 3's "known gap" note, the priority list, the
dependency table, and the README's unimplemented-verbs section all said blocked
and no longer are. Section 3 also gains the thing that replaced the gap: the
character grid comes from akgl_text_measure(font, "A", &w, &h), the direct
equivalent of the font.SizeUTF8("A") at basicruntime.go:96, and
akgl_text_measure_wrapped takes the same wraplength argument
akgl_text_rendertextat does so the measurement and the draw cannot disagree
about where a line breaks.
One caveat recorded rather than papered over: -DAKBASIC_WITH_AKGL=ON has never
been configured in this repository, because until now there was nothing to build
against. The akbasic_akgl target is unproven and needs libakgl's own submodules
present. Expect to fix something there on the first attempt.
Default build unaffected: ctest 61/61, doxygen exits 0, no warnings.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Both bumps are TODO.md only -- no code, no headers, no build files -- so nothing
akbasic links against changed and the suite is unaffected.
libakgl 6dfe748 -> 5f03475 records the four API gaps blocking this port: text
measurement (which blocks the akgl text sink outright), immediate-mode drawing,
audio, and a non-blocking keystroke read.
libakstdlib 95e5002 -> fd71bcc records what this port had to work around,
including the measurement that akbasic makes 10 calls into that library against
116 to raw libc.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Reproduces deps/basicinterpret in C, in the idiom of the ak* libraries. All 41
.bas files in the reference's corpus produce byte-identical stdout, including
the trailing double newline on an error line -- that comes from basicError
building a string ending in \n and handing it to Println, and
array_outofbounds.txt encodes it.
The corpus is driven in place from the submodule as 41 individual CTest cases
rather than copied, so it cannot drift from upstream. Eighteen unit tests cover
what the corpus cannot reach.
Three structural changes carry most of the work. Go's three reflection lookups
(Command*, Function*, ParseCommand*) become one sorted dispatch table in
src/verbs.c searched with bsearch; adding a verb is a row and two functions. The
five Go maps become one fixed open-addressed table over aksl_strhash_djb2. And
run(), which owned the process until MODE_QUIT, splits into step() plus a
bounded run() -- goal 3 requires a host game to be able to bound execution, and
nothing in the library now terminates the process or touches SDL.
Output goes through an akbasic_TextSink vtable. src/sink_stdio.c is what makes
the corpus runnable with no SDL present; the akgl-backed sink is still to come
and is blocked on libakgl having no text-measurement call.
src/convert.c exists because libakstdlib's aksl_ato* family cannot report a
conversion failure (its TODO.md 2.1.5). The reference checks strconv's error at
four sites and turns it into a BASIC error; routing those through aksl_atoi
would have turned four diagnosable errors into wrong answers, with VAL("garbage")
quietly returning 0. TODO.md 1.9 records which libakstdlib calls are cleared for
use here and which are not.
Reference defects are reproduced, not fixed: the golden files encode the observed
behaviour and a silent correction is a behaviour change. TODO.md section 6 lists
sixteen, and tests/known_reference_defects.c asserts the *correct* contract for
six of them under AKBASIC_KNOWN_FAILING_TESTS, so a fix shows up as
"unexpectedly passed". Five of the sixteen were found by this port and are new:
subtraction stops after one operator so 1-2-3 computes 1-2 and abandons the rest
of the line (a wrong answer, not a refused one); a unary-minus argument inflates
a function's arity so ABS(-9) is rejected; a comparison operator in a line's
final column is dropped; hex literals never survive the scanner; and the
"Reserved word in variable name" check is dead code.
Where the reference reaches undefined behaviour by a route that is defined in Go
-- an out-of-range shift, a negative string multiplier, integer division by zero
-- this raises instead of inheriting the UB. No golden case exercises any of
them.
The top-level CMakeLists shadows add_test, set_tests_properties and
add_custom_target around all three add_subdirectory calls. Without it libakerror's
tests land in our suite as Not Run, and its un-namespaced `coverage` target stops
a coverage build from configuring at all. Test targets are akbasic_test_<name>:
bare test_<name> collides with libakstdlib's, which is what broke libakgl's
configure in c2b16d3.
ctest 59/59; ASan+UBSan 59/59; 92.3% line and 96.9% function coverage; no
warnings under -Wall -Wextra. Branch coverage is not a target, for the reason
libakstdlib and libakgl both record: the akerror macros expand into large branch
trees at every call site.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
