Tachikoma
4e188b2794
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>
Co-Authored-By: Andrew Kesterson <andrew@aklabs.net>
55 lines
2.0 KiB
C
55 lines
2.0 KiB
C
/**
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* @file sink.h
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* @brief Declares the text sink: where PRINT goes and where INPUT comes from.
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*
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* The reference's Write() and Println() mirror every line to stdout *and* to an
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* SDL surface, and that mirror is the only reason its golden-file suite works.
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* Reproducing it as a hardcoded pair of calls would drag SDL into the core and
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* make the corpus unrunnable without a display, so it becomes a record of
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* function pointers instead -- the house pattern for anything that varies.
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*
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* akbasic_sink_init_stdio() is in the library. akbasic_sink_init_akgl() is in the
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* separate akbasic_akgl target and draws through whatever renderer the host game
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* already initialized; the interpreter never owns a window.
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*/
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#ifndef _AKBASIC_SINK_H_
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#define _AKBASIC_SINK_H_
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#include <stdio.h>
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#include <akerror.h>
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#include <akbasic/types.h>
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typedef struct akbasic_TextSink
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{
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void *self;
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akerr_ErrorContext AKERR_NOIGNORE *(*write)(struct akbasic_TextSink *self, const char *text);
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akerr_ErrorContext AKERR_NOIGNORE *(*writeln)(struct akbasic_TextSink *self, const char *text);
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/**
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* Read one line. Sets *eof true at end of input rather than raising, because
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* running off the end of a stream is how RUNSTREAM mode finishes normally.
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*/
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akerr_ErrorContext AKERR_NOIGNORE *(*readline)(struct akbasic_TextSink *self, char *dest, size_t len, bool *eof);
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akerr_ErrorContext AKERR_NOIGNORE *(*clear)(struct akbasic_TextSink *self);
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} akbasic_TextSink;
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/** @brief State for the stdio-backed sink. */
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typedef struct
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{
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FILE *out;
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FILE *in;
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} akbasic_StdioSink;
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/**
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* @brief Point a sink at a pair of stdio streams.
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* @param obj Object to initialize, inspect, or modify.
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* @param state Storage for the stream pair; must outlive the sink.
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* @param out Where write/writeln go; NULL selects stdout.
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* @param in Where readline reads; NULL selects stdin.
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*/
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akerr_ErrorContext AKERR_NOIGNORE *akbasic_sink_init_stdio(akbasic_TextSink *obj, akbasic_StdioSink *state, FILE *out, FILE *in);
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#endif // _AKBASIC_SINK_H_
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