Andrew Kesterson
9845e77a5c
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>
34 lines
748 B
QBasic
34 lines
748 B
QBasic
10 REM DO/LOOP in all four shapes, plus ON and a multi-line IF block.
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20 I# = 0
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30 DO WHILE I# < 3
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40 PRINT "WHILE " + I#
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50 I# = I# + 1
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60 LOOP
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70 I# = 0
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80 DO
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90 PRINT "UNTIL " + I#
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100 I# = I# + 1
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110 LOOP UNTIL I# = 2
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120 REM A condition already false runs no body at all.
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130 DO WHILE 1 == 2
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140 PRINT "NEVER SEEN"
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150 LOOP
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160 REM ON picks the nth target, one-based, and falls through past the end.
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170 X# = 2
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180 ON X# GOSUB 500, 600
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190 X# = 7
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200 ON X# GOTO 500, 600
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210 PRINT "FELL THROUGH"
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220 REM BEGIN/BEND makes an IF span lines.
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230 IF I# = 2 THEN BEGIN
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240 PRINT "IN BLOCK"
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250 BEND
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260 IF I# = 99 THEN BEGIN
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270 PRINT "NEVER SEEN EITHER"
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280 BEND
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290 END
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500 PRINT "SUB ONE"
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510 RETURN
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600 PRINT "SUB TWO"
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610 RETURN
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