dimgigov
f619316470
Lower match to if-else for literals, ranges, enum tags, and wildcards. Fix bootstrap literal arms that always matched; port real arm AST/parser and Lcx_LowerMatch to selfhost with last-expression return. Expand pattern_matching example and add parse/use-after-move/double-mut golden diagnostics. Selfhost-loop remains binary-identical.
214 lines
11 KiB
Markdown
214 lines
11 KiB
Markdown
# Bux — План към „добър“ език (v0.5 → v1.0)
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> **Дата:** 2026-07-16 (вечерта)
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> **Текущо:** v0.5.x — selfhost loop, gradual ownership, green threads, **40+ examples**, match expr **bootstrap+selfhost** ✅
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> **Цел:** Език, с който се пишат реални проекти комфортно, безопасно (по избор) и с надежден toolchain.
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---
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## Диагноза (къде сме)
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| Слой | Състояние | Оценка |
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|------|-----------|--------|
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| Frontend (lex/parse) | Пълен Pratt parser, recovery | ★★★★☆ |
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| Sema / generics | Monomorphization, trait bounds basic | ★★★★☆ |
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| HIR → C | Tuples + fat `func` ABI в bootstrap **и** selfhost | ★★★★☆ |
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| Selfhost (`src/`) | ~12k LOC, binary-identical loop, closures+tuples | ★★★★★ |
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| Gradual ownership | `@[Checked]`, `&`/`&mut`, move, Drop | ★★★☆☆ (basic) |
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| Concurrency | M:N tasks + channels + async | ★★★★☆ |
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| Stdlib | Array/Map/Set/String/Iter HOF разширени | ★★★★☆ |
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| Tooling | `test-errors`, LSP diagnostics via `buxc check` | ★★★☆☆ |
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| Ecosystem / registry | path+git deps; няма централен registry | ★☆☆☆☆ |
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| Документация | README + QUALITY_PLAN синхронизирани (2026-07-15) | ★★★★☆ |
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**Силна ниша:** gradual ownership (C-скорост на писане + opt-in Rust-safety).
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**Слабо място:** ergonomics на stdlib + maturity на tooling + пълнота на borrow checker.
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---
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## Какво значи „добър“ за Bux
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1. **Ежедневен DX** — колекции, string, assert, грешки, които разбираш за секунди.
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2. **Предвидима безопасност** — `@[Checked]` да хваща 80% от UAF/double-borrow без lifetime hell.
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3. **Selfhost като dogfood** — компилаторът и apps (`nexus`, `boko`) са proof.
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4. **Инструменти** — fmt, test, LSP, package install без ръчна магия.
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5. **Стабилна спецификация** — LanguageRef = реалното поведение.
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Не целим „по-добър Rust“. Целим **единствения език с gradual safety + Go-стил concurrency без GC**.
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---
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## Фази
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### A — Ergonomics & Stdlib (P0) ✅ (core done)
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| # | Задача | Защо | Статус |
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|---|--------|------|--------|
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| A.1 | Array: Pop, Clear, IsEmpty, First, Last, Cap, Reserve | Без това колекциите са неудобни | ✅ (тази сесия) |
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| A.2 | String: IsEmpty, ReplaceAll | Чести операции; само first-replace досега | ✅ (тази сесия) |
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| A.3 | Os_Exit + Test_AssertEqString / richer asserts | Тестове и CLI без raw `bux_exit` | ✅ (тази сесия) |
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| A.4 | Map_Remove / Set polish | Completeness на колекциите | ✅ (тази сесия) |
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| A.5 | Iter: map/filter/fold върху closures | Higher-order без boilerplate | ✅ Iter_Map/Filter/FoldInt |
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| A.6 | Result helpers: Expect, UnwrapErr, Or | По-малко match boilerplate | ✅ (тази сесия) |
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### B — Compiler Correctness (P0)
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| # | Задача | Защо | Статус |
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|---|--------|------|--------|
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| B.1 | Proper tuple types в C backend | `(T,U)` → `Tuple_T_U` struct + `.0`/`.1` | ✅ bootstrap + selfhost |
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| B.2 | Function pointer types | `func(T)->U` fat ABI | ✅ bootstrap + selfhost |
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| B.3 | Match expression lowering (literals, ranges, enums) | Expression-context match → if-else | ✅ bootstrap + selfhost |
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| B.4 | Closures multi-instance | Fat `BuxFn` + heap env | ✅ bootstrap + selfhost |
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| B.4b | Closures: loop/return edge cases in body | По-сложни body control-flow | ⏳ |
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| B.5 | По-добри diagnostics (snippet + hint) | DX #1 за нови потребители | ✅ |
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| B.6 | Bootstrap ↔ selfhost feature parity | Tuples/closures/**match** done; string interp / some ops still bootstrap-heavy | 🔄 |
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### C — Gradual Ownership 2.0 (P1)
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| # | Задача | Защо |
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|---|--------|------|
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| C.1 | Lifetime elision за common cases | Без `'a` в 90% от API-тата |
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| C.2 | Exclusive `&mut` vs shared `&` data-flow | По-малко false negatives |
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| C.3 | Auto-drop edge cases (early return, branches) | RAII да е надежден |
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| C.4 | `@[Release]` zero-cost path документация + golden tests | Killer story: safe default, free hot path |
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### D — Tooling (P1)
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| # | Задача | Защо |
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|---|--------|------|
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| D.1 | LSP: hover, go-to-def, diagnostics (wire към sema) | IDE = adoption |
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| D.2 | `bux fmt` стабилен + CI check | Единен style |
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| D.3 | `bux test` с `--filter`, exit codes, summary table | CI-friendly |
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| D.4 | `bux doc` от `///` comments | Самодокументиращ се stdlib |
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| D.5 | Golden tests за stdlib modules | Регресии без изненади |
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### E — Ecosystem & v1.0 (P2)
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| # | Задача | Защо |
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|---|--------|------|
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| E.1 | Package registry protocol (git/HTTP) | `bux add foo` без path hacks |
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| E.2 | 3–5 production-quality apps в `apps/` | Showcase |
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| E.3 | Language freeze + semver policy | Trust |
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| E.4 | Debugger/DWARF basics | Systems audience |
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| E.5 | Benchmarks vs C/Zig/Nim (micro + nexus) | Marketing + regression |
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---
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## Препоръчан ред на работа
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```
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A (stdlib ergonomics) → B (compiler holes) → C (ownership depth)
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↓ ↓
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D (tooling) ←────────── dogfood apps
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↓
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E (v1.0 ecosystem)
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```
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**Правило:** всяка сесия ship-ва нещо runnable (stdlib API, fix, example), не само docs.
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---
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## Acceptance criteria за „добър v1.0“
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- [ ] Всички examples + selfhost-loop + 3 apps минават на CI
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- [ ] Array/Map/String/Test API покрива 90% от ежедневните нужди
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- [ ] `@[Checked]` хваща use-after-move + double `&mut` в documented subset
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- [ ] `bux test` + `bux fmt` + `bux check` са default developer loop
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- [ ] LanguageRef синхронизиран с компилатора
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- [ ] Поне един външен проект (не в monorepo) build-ва с git dep
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---
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## Сесия 1 (stdlib ergonomics)
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1. `Array_Pop`, `Array_Clear`, `Array_IsEmpty`, `Array_First`, `Array_Last`, `Array_Cap`, `Array_Reserve`
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2. `String_IsEmpty`, `String_ReplaceAll`
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3. `Os_Exit`
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4. `Test_AssertEqString`, `Test_AssertNeqInt`, `Test_AssertEqBool`
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5. Example + docs update
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## Сесия 2 (collections + tuples)
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1. `Map_Remove` / `Map_Clear` / `Map_IsEmpty` (+ StringMap)
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2. `Set_Remove` / `Set_Clear` / `Set_IsEmpty`
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3. `Result_Expect` / `Result_UnwrapErr` / `Result_Or`
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4. `Option_Expect` / `Option_Or`
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5. **Tuples:** `(T, U)` → `typedef struct { T _0; U _1; } Tuple_T_U` + field access `.0`/`.1`
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6. Examples: `tuples`, `func_ptr`, `map_remove`
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## Сесия 3 (diagnostics + collections)
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1. **Rust-style errors** in bootstrap CLI: `--> file:line:col`, source snippet, `^` caret, `= help:` hints
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2. `SourceLocation.file` propagated from lexer
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3. Better caret for type-mismatch on `let` (points at initializer)
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4. `Array_Contains` / `Array_IndexOf` / `Array_Extend`
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5. `Iter_AnyEq` / `Iter_AllEq` / `Iter_Collect`
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6. Selfhost `Diagnostic_Hint` for common messages
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## Сесия 4 (diagnostics depth + LSP + strings)
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1. **Multi-char underlines** (`^^^^^^^` under tokens/strings/idents)
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2. Quoted-name highlighting for `undeclared identifier 'x'`
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3. **Golden error tests** (`tests/error_golden/`, `make test-errors`)
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4. **LSP** runs `buxc check` and publishes real diagnostics
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5. `String_IsBlank` / `String_Repeat`
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## Сесия 5 (multi-instance closures)
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1. **Fat function pointers** for all `func(...)` types: `BuxFn { code(env, args...), env }`
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2. Capturing closures: heap-allocate env per creation site (independent instances)
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3. Capture-less closures + named funcs: adapters with `env = NULL`
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4. Calls through func values: `f.code(f.env, args...)`
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5. Example `multi_closure.bux` — MakeAdder(10)/MakeAdder(20) yield 11 and 21
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6. **Selfhost parity:** same fat ABI in `src/hir_lower.bux` + `src/c_backend.bux` (makers, adapters)
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## Сесия 6 (selfhost tuples)
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1. Parser: `(T, U)` types, `(a, b)` exprs, field access `.0`/`.1`
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2. Sema: tekTuple / ekTuple
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3. HIR lower → `hStructInit` of `Tuple_int_int`
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4. C backend: `typedef struct Tuple_int_int { int _0; int _1; }`
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5. Verified with `buxc2` on `examples/tuples.bux`
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## Сесия 7 (Iter HOF)
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1. `Iter_MapInt` / `FilterInt` / `FoldInt` / `ForEachInt` / `AnyInt` / `AllInt` / `SumInt`
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2. Named funcs + capturing closures (fat ABI)
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3. Example `iter_hof.bux` (sum=15, product=120)
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4. Selfhost fix: pointer `->` field access; no bogus bounds check on `arr.data[len]` (Push)
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## Сесия 8 (match expression + error goldens)
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1. **Match expression lowering** (B.3): `pkLiteral`, `pkRange` (`a..b` / `a..=b`), enum tags, wildcard
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- Bugfix: literal arms were always-true (`else` branch) → `match 1 { 1=>10, 2=>20 }` returned 10 for all
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- `skMatch` now also lowers via `lowerMatch` (void result)
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2. Expanded `examples/pattern_matching.bux` (enums + classify ranges + string arms)
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3. **Error golden cases** (`tests/error_golden/`):
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- `parse_error` — incomplete `let x = ;`
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- `use_after_move` — `@[Checked]` + `own String`
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- `double_mut_borrow` — two `&mut` of same var
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4. `run.sh` normalize: absolute paths in "parse errors in …" lines
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## Сесия 9 (selfhost match — B.6 parity)
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1. **AST:** `MatchArm` linked list; `Pattern.patChild1/2` for ranges; `Expr.matchArms`
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2. **Parser:** full `parserParsePattern` / `parserParseMatchExpr` (was skip-arms stub)
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- literals, `_`, ident, `Enum::Variant` / `Enum::Variant(...)`, ranges
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- statement `match` → `skExpr` + `ekMatch`
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3. **Sema:** type-check subject + arms; propagate first-arm type to `expr.refType`
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4. **HIR lower:** `Lcx_LowerMatch` → alloca result + if-else stores (enum `.tag` / simple / literal / range)
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5. **Last-expr return:** `Lcx_LowerBlock` converts final `skExpr` into `return` (needed for `func F() -> T { match ... }`)
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6. Verified: `pattern_matching` via **buxc2**; simple enum + ranges; **selfhost-loop IDENTICAL ✓**
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---
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## Следващи стъпки
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1. **LSP hover / go-to-def** (над текущите diagnostics)
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2. **Generic Iter map** (не само int), ако monomorphization с `func` params е стабилна
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3. **Closures B.4b** — loop/return edge cases in closure body
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4. Struct/tuple patterns + pattern bindings (`Some(value)` binds `value`)
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5. `let x = match ...` multi-stmt yield (beyond tail-position return)
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6. String interpolation / remaining bootstrap-only features (B.6)
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