9 Commits

Author	SHA1	Message	Date
Tachikoma	d219f80777	Port onto libakstdlib 2b79aca and convert the eight bool predicates ... akbasic's src/ now calls libakstdlib 313 times and raw libc 7 -- 2.2% bypassed, against 86.4% on the same tree before this. The submodule bump 669b2b3 -> 2b79aca needed no source change of its own: the release is drop-in for what akbasic already used. Seven of the eight sites the earlier port left on raw libc change their own signature rather than swallowing an error, per andrew's ruling on libakstdlib#38. word_is, the is_waiting_for pair, the scanner's is_at_end, peek, peek_next and match_next_char, format.c's overflow, and sink_akgl's scroll/newline/putchar_at/echo_line/edit_key chain all return an akerr_ErrorContext * and hand the answer back through an out parameter. is_waiting_for and is_waiting_for_any are a public header change; every call site that used one as a term in a condition hoists it into a statement first. verb_compare is the eighth and stays on strcmp. bsearch(3) fixes the comparator's signature, so there is no out parameter to report through -- which is what libakstdlib#38 concluded. It carries a comment saying so and saying why the bypass is safe there. Six snprintf sites stay raw because they want truncation as an answer rather than an error, and aksl_snprintf cannot express that until libakstdlib#34 hands the required length back. Each of the six says so at the site. Two of them, in host.c, are a latent defect rather than a decision: a host type name over 31 characters truncates silently and two sharing a prefix then collide, where structtype.c refuses the same case. DLOAD leaked a file descriptor. Its read loop sat inside an ATTEMPT and the PASS in it returned past CLEANUP, so a scan error left the file open. Hoisting the loop into its own helper to convert fgets fixes it. Refs libakstdlib#26, libakstdlib#38 Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>	2026-08-03 15:41:49 -04:00
Tachikoma	c5d13f00f6	Repoint the TODO.md citations that no longer resolve ... Its own SS0-SS9 structure survived the move to the tracker, so 133 citations still resolve and are left alone. Thirteen did not. Six named another repository's TODO.md by a section number: libakstdlib 1.6, 2.2.2 and 2.3, and libakgl's file. Those repositories dropped their numbering entirely, so each now names UPGRADING.md, an issue, or the tracker. Three cited 'TODO.md section 12', which has never existed here -- the defect list is SS6. TODO.md itself caught two others of that class earlier. The CMakeLists comment carried a stale premise with it: eleven defects 'deliberately reproduced and not yet fixed' stopped being the rule when SS0.1 retired the fidelity constraint. Four told a reader to record work in TODO.md; the scanner defect is issue #4, the audio_tables mutation gap is #25, and the UI gaps are libakgl #79 and #80. Verified: cmake --build build && ctest --test-dir build, 112/112. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Co-Authored-By: Andrew Kesterson <andrew@aklabs.net>	2026-08-02 22:01:28 -04:00
Tachikoma	748fb5f91c	Honour a subscript in SSHAPE and GSHAPE ... `shape_variable()` took the identifier off the leaf and looked the variable up without ever evaluating the subscript, and both verbs then addressed element zero with a literal. So `SSHAPE SH$(2), ...` wrote the handle into `SH$(0)` and `GSHAPE SH$(2)` stamped whatever was in `SH$(0)`. Ordinary assignment and `PRINT` honour the subscript, which is what made this expensive: a program keeping several saved shapes in an array got every one of them resolving to the same element, silently, and the only symptom was that every stamp came out as the last shape captured. The Breakout in examples/ keeps its six brick stamps in six separate scalars for exactly this reason. `SPRSAV` was the counter-example and is the model -- it evaluates its argument and handles an array element correctly. The subscript resolution itself is now shared: `collect_subscripts()` comes out of src/environment.c as `akbasic_environment_collect_subscripts()`, so a verb taking a variable by name resolves a subscript the same way assignment does rather than each verb deciding for itself. tests/graphics_verbs.c covers TODO.md's reduction -- which used to print "[SHAPE:0] []" and now prints "[] [SHAPE:0]" -- and the case a program actually wants: two shapes captured into two elements, each stamped back through its own, asserted against the device log so a fix that merely made the strings look right would not pass. Chapter 18's trap 4 becomes history, and Chapter 6 says an array works. TODO.md section 9 item 6, struck. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Co-Authored-By: Andrew Kesterson <andrew@aklabs.net>	2026-08-02 00:10:24 -04:00
Tachikoma	cd038a55a2	Share a host program's own C structures with a script ... A BASIC TYPE and a host C struct are the same thing seen from two sides, so both go in one type table and everything the language already does with a structure works across the boundary with no second set of rules. The host describes its struct once as a table of field descriptors and binds an instance: akbasic_host_bind(&SCRIPT, "FOE@", "ENEMY", &GOBLIN); after which `FOE@.HP# = FOE@.HP# - 10` decrements GOBLIN.hp in place, with no marshalling step the host has to remember to run. The sharing is done with shadow slots: a binding takes a run from the same value pool a DIMmed record uses, a field read refreshes its slot from host memory first, and a write converts back and stores. So the script always sees current values and its writes always land, while the rest of the interpreter goes on seeing one storage model instead of two. AKBASIC_HOST_FIELD takes the offset and the width from the same member, which is the only reason it is a macro: writing offsetof and sizeof out by hand is two chances to name the wrong member and no way to notice. A field name's suffix must agree with the C type it describes, refused at registration -- a host writing "HP%" over an int32_t has said two different things about one field and the script would believe the suffix. Conversion refuses rather than truncates. 200 into an int8_t, 70000 into an int16_t, -1 into a uint8_t and thirteen characters into a char[8] are each an error naming the field, because a silent wrap is found three frames later in code that did nothing wrong. Each width is tested separately, since a range check is exactly the thing that is right for int32_t and wrong for int8_t when only one of them is covered. The language's own distinction turns out to be the one a host needs, so there is one API rather than two: assignment copies and gives a script a private snapshot, POINT shares and lets it change the game, and which one happened is visible in the listing. Two things the work required. The prescan runs again on every RUN and used to wipe the whole type table, unregistering the host's types the first time a script ran; it now keeps what the host registered and drops only what the script declared. And akbasic_runtime_start() did not rewind, which cost nothing while a host started a script once and cost everything to a host running one per enemy -- the second start began past the end and silently did nothing. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Co-Authored-By: Andrew Kesterson <andrew@aklabs.net>	2026-08-01 11:56:04 -04:00
Tachikoma	4f86a9ca44	Add records: TYPE, DIM ... AS, field access, copy on assign ... BASIC 7.0 has no records at all, so none of this is a port. The `@` suffix was not invented either: the Go reference reserved IDENTIFIER_STRUCT and never used it, and src/grammar.c rendered such a leaf as "NOT IMPLEMENTED" until now. Declaring the type is what buys the storage model. A TYPE states its fields, so an instance has a known slot count and is laid out exactly as an array is -- one contiguous run from the same value pool DIM already draws from, with field access as offset arithmetic. No new pool holds data; the only new table holds descriptors. A nested value flattens into its container's run, which is why LINE with two POINTs and a string is five slots rather than three. Each field takes its type from its own suffix, the same rule every other name here follows, so a field list needs no type column. An `@` field is the exception and has to name its type, because three primitive types fit in three suffix characters and N declared types do not fit in one. The declaration is prescanned before the program runs, like labels and DATA and for the same reason: it has to be in effect wherever control goes. Three passes, each for a case the one before cannot do -- names first so a field can refer to a type declared later, then field lists, then sizes by repeated resolution. What never resolves is a cycle of by-value containment, so "a TYPE cannot contain itself by value" is a diagnosis rather than an assumption, and the message says to use PTR TO instead. Assignment copies. That interception is the whole feature and it cannot live in akbasic_value_clone(), which copies one slot -- and one slot holds a *reference* to an instance rather than the instance, so going through it would alias. A structure is intercepted before that path and its slots are copied one at a time, walking the descriptor rather than memcpy-ing the run, because a pointer field must copy its reference where a value field must copy its slots. Two smaller things the work required. All three prescans now sit inside one ATTEMPT: a malformed declaration is the program's mistake, and it was printing a stack trace and taking the driver with it, which is the boundary goal 3 exists to draw. And a fresh variable's structtype is -1 rather than the 0 a memset leaves, because 0 is a valid type index and every new variable was claiming to be the first type declared. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Co-Authored-By: Andrew Kesterson <andrew@aklabs.net>	2026-08-01 11:39:47 -04:00
Tachikoma	4e7d2cff6c	Finish the language: every remaining verb group, and the defects that blocked them ... Closes groups A, C, D, E, F, H and J of TODO.md section 4, plus RESTORE and RENUMBER, and closes section 6 -- all seventeen reference defects. Seven of those turned out to have been fixed or never ported and nobody had written it down; the audit records the evidence for each. Two of the seventeen were real. math_plus mutated its left operand when the operand was mutable, so A# + 1 could modify A#; it was gated on FOR/NEXT coverage because NEXT relied on the mutation, so tests/for_next.c came first and NEXT now writes the counter back itself. And the binary operators summed both numeric fields of their right operand, which no BASIC program can reach -- that one needed a test written against the value API. Writing the tests turned up eight defects nobody had listed. Seven are fixed: IF A = 2 THEN was a parse error; only == worked IF ... AND ... was a parse error, because a condition parsed as one relation IF A = 1 OR B = 2 THEN was silently always false, and so was IF A THEN EXIT before any NEXT restarted the program and exhausted the variable pool READ never found a DATA line above it, and swallowed the lines between PRINT 2 + 2 at the prompt was filed as program text instead of answering a short read discarded its bytes, so COPY produced empty files every verb taking an argument list said "peek() returned nil token!" on none The eighth is not fixed and cannot be quietly: a FOR whose step overshoots runs its body one extra time, and FOR I = 1 TO 1 runs it zero times. The two errors cancel for a step of 1, which is why neither was noticed. Correcting them changes the expected output of a checked-in acceptance file, and tests/reference/README.md forbids editing one to suit this interpreter. It is tests/for_semantics.c in AKBASIC_KNOWN_FAILING_TESTS, asserting the correct contract, and TODO.md items 19 and 20. Sprites are real libakgl actors with a renderfunc of their own, because akgl_actor_render draws every sprite square and an actor has no per-axis scale. Both are filed upstream. SPRSAV takes an image file, an SSHAPE handle or a 63-element integer array -- a string here cannot hold a zero byte. Verbs that need hardware that does not exist are refused by name with the reason rather than faked: SYS, HEADER, COLLECT, BACKUP, BOOT, FILTER, and DIRECTORY, which is refused for a missing libakstdlib wrapper filed upstream. 94 tests in the default build, 93 with SDL, 94 under ASan and UBSan, doxygen clean. The Go acceptance corpus stayed green throughout. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Co-Authored-By: Andrew Kesterson <andrew@aklabs.net>	2026-07-31 21:50:37 -04:00
Tachikoma	4e98dba423	Give argument lists their own link, not each argument's .right ... An identifier's subscript list, a unary's operand and a binary's right-hand side all lived in the same field the argument chain used, so ABS(-9), MOD(A#, B# + 12) and any array reference in a parameter list were counted as extra arguments and refused. Subscript lists move to .expr and arguments now chain through a dedicated .next. This is the third time the same collision was fixed; the first two moved it along rather than removing it. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Co-Authored-By: Andrew Kesterson <andrew@aklabs.net>	2026-07-31 11:58:15 -04:00
Tachikoma	e7ef48f1ca	Add akbasic_runtime_global: a host variable lands in the script's root scope ... A host creating a variable while a script was suspended got it in whatever scope was active -- usually a FOR or GOSUB body -- and it died when the body popped, silently. Reaching for the root by hand returned NULL without raising, because environment_get only auto-creates in the active environment. Both are still true of environment_get, which is correct for what the interpreter uses it for. The README and the example now point somewhere else. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Co-Authored-By: Andrew Kesterson <andrew@aklabs.net>	2026-07-31 11:53:05 -04:00
Tachikoma	4e188b2794	Port the BASIC interpreter from Go to C ... 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>	2026-07-30 23:53:56 -04:00