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Phase 7h: string slicing s[a..b] (retire substr)

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`s[a..b]` is a fresh substring of the bytes [a, b) — the modern, end-based form
of the C-style `substr(s, start, count)`:

  substr(src, start, i - start)   -> src[start..i]
  substr(t, 2, len(t) - 2)        -> t[2..len(t)]
  substr(src, i, 2)               -> src[i..i + 2]

Mechanics: a new E_SLICE postfix (`base[lo..hi]`, distinct from `base[i]`
indexing) lowers to a @fn_str_slice prelude (malloc + copy + terminate), emitted
once into any program that slices. Two reseeds: add the syntax + prelude, then
migrate the 22 substr calls and delete substr. The migrator recognises the
common `count == end - start` shape and emits the clean `s[start..end]` rather
than `s[start..start + (end - start)]`.

examples/strings.ludic gains slicing (now prints 1..9). Reseeded (22673 lines);
C-free fixpoint holds; goldens identical; 18/18; vocab + doc-fences clean.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-08-28 01:35:24 +03:00
parent 0efa06dca2
commit 1b9789630a
14 changed files with 4049 additions and 3914 deletions
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4
test.sh
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@ -68,8 +68,8 @@ if ./selfhost/game-build.sh build/ludicc examples/toggle.ludic "/tmp/ludic_tog"
else bad "toggle: $(tail -1 /tmp/tog.out)"; fi
# String operators: ==/!= compare by content, + concatenates (str_* prelude).
if ./selfhost/game-build.sh build/ludicc examples/strings.ludic "/tmp/ludic_str" >/tmp/str.out 2>&1 \
&& [ "$(/tmp/ludic_str </dev/null | tr '\n' ' ')" = "1 2 3 4 5 6 7 " ]; then
ok "strings.ludic (str ==/!=/+ and `interpolation`)"
&& [ "$(/tmp/ludic_str </dev/null | tr '\n' ' ')" = "1 2 3 4 5 6 7 8 9 " ]; then
ok "strings.ludic (str ops, interpolation, slicing)"
else bad "strings: $(tail -1 /tmp/str.out)"; fi
# --- Toolchain-agent CLI smoke tests append below this line ---
echo "== self-hosted front-end binaries (ludicc / ludic) =="