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lib/ascii: add strlower/strupper

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Port ref/hare/ascii/string.ha strlower/strupper as the allocating entry
points: byte-wise ASCII case fold, equivalent to Hare's rune fold since
case-folding only touches bytes <0x80 and every UTF-8 multibyte byte is
>=0x80 (passes through unchanged, length-preserving). nomem arises only
from the allocation's `?`.

strlower_buf/strupper_buf are deferred: ww has no nomem-value form or
capacity-bounded static-append to express Hare's too-small-buffer path
(#230); restore the two-tier delegation when those land.

Divergence (rule 7): the empty-input fast path returns a nil/0 str
because ww's alloc([], 0) routes through nomem, whereas Hare allocs a
zero-length buffer and zero-loops; documented at the bypass site.

Test vectors mirror Hare's @test (ABC/abc/[[[/こ/empty/aB1z). Adds
lib/ascii/asciitest.ww + test/wcc/904_ascii_run.c (registered in the
Makefile TESTS list and a build rule). Regenerates the ascii-embedding
selfhost combined.ww amalgams (#110 freshness); the wwdump amalgam also
reorders the ascii block after strings to satisfy the new import edge.
This commit is contained in:
Hojun-Cho
2026-06-01 09:15:18 +09:00
parent 8481a05c3a
commit 07fed80fab
7 changed files with 558 additions and 275 deletions
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7
Makefile
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@@ -405,7 +405,8 @@ TESTS = $(BIN)/test_smoke $(BIN)/test_lex $(BIN)/test_parse $(BIN)/test_check \
$(BIN)/test_opaque_assign_cast_run \
$(BIN)/test_sort_run \
$(BIN)/test_bufio_run $(BIN)/test_random_run \
$(BIN)/test_asserttyped_gap
$(BIN)/test_asserttyped_gap \
$(BIN)/test_ascii_run
$(BIN)/test_smoke: test/wcc/000_smoke.c $(LIB)/libwcc.a | $(BIN)
$(CC) $(CFLAGS) $(INCS) -o $@ $< -L$(LIB) -lwcc
@@ -1376,6 +1377,10 @@ $(BIN)/test_bytes_run: test/wcc/967_bytes_run.c $(BIN)/ww $(BIN)/w6c \
$(BIN)/w6a $(BIN)/w6l $(LIB)/libwwrt.a | $(BIN)
$(CC) $(CFLAGS) -o $@ $<
$(BIN)/test_ascii_run: test/wcc/904_ascii_run.c $(BIN)/ww $(BIN)/w6c \
$(BIN)/w6a $(BIN)/w6l $(LIB)/libwwrt.a | $(BIN)
$(CC) $(CFLAGS) -o $@ $<
$(BIN)/test_decimal_run: test/wcc/922_decimal_run.c $(BIN)/ww $(BIN)/w6c \
$(BIN)/w6a $(BIN)/w6l $(LIB)/libwwrt.a | $(BIN)
$(CC) $(CFLAGS) -o $@ $<