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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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5
LANGUAGE.md
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@ -598,7 +598,10 @@ let msg = `hello {name}, you have {count + 1} messages`
```
`str(x)` is the same conversion on its own. Write a literal brace as `{{` / `}}`.
`expr with { field: … }`
**Slicing.** `s[a..b]` is a fresh substring of the bytes `[a, b)`, and `len(s)`
is a string's byte length — so `path[0..len(path) - 6]` trims an extension and
`s[i]` still indexes a single byte. `expr with { field: … }`
is not implemented; records appear only in `spawn`. Char literals (`'w'`) are
`int` code points; colors are hex ints (`0xff8800`). `null` is the null-pointer
literal; test any pointer/record/slice with `x == null` / `x != null` (an unset