Files

tomoaki ab76e39036 feat(parser): Phase 285A1.4 & A1.5 - Weak field sugar + Parser hang fix

A1.4: Add sugar syntax `public weak parent` ≡ `public { weak parent }`
A1.5: Fix parser hang on unsupported `param: Type` syntax

Key changes:
- A1.4: Extend visibility parser to handle weak modifier (fields.rs)
- A1.5: Shared helper `parse_param_name_list()` with progress-zero detection
- A1.5: Fix 6 vulnerable parameter parsing loops (methods, constructors, functions)
- Tests: Sugar syntax (OK/NG), parser hang (timeout-based)
- Docs: lifecycle.md, EBNF.md, phase-285a1-boxification.md

Additional changes:
- weak() builtin implementation (handlers/weak.rs)
- Leak tracking improvements (leak_tracker.rs)
- Documentation updates (lifecycle, types, memory-finalization, etc.)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

2025-12-24 07:44:50 +09:00

3.7 KiB

Raw Blame History

Nyash Quick Reference (MVP)

Purpose

One‑page practical summary for writing and implementing Nyash.
Keep grammar minimal; clarify rules that often cause confusion.

Keywords (reserved)

control: if, else, loop, match, case, break, continue, return
decl: static, box, local, using, as
lit: true, false, null, void

Expressions and Calls

Function call: f(a, b)
Method call: obj.m(a, b) — internally normalized to function form: Class.m(me: obj, a, b)
- Default‑ON（P4）: Known 受信者かつ関数が一意に存在する場合に正規化（userbox 限定）。
- それ以外（Unknown/core/user‑instance）は安全に BoxCall へフォールバック（挙動不変）。
- 環境で無効化: NYASH_REWRITE_KNOWN_DEFAULT=0（開発時の切替用）。
- バックエンド（VM/LLVM/Ny）は統一形状の呼び出しを受け取る。
Member: obj.field or obj.m

Display & Conversion

Human‑readable display: str(x)（推奨）/ x.str()
- 既存の toString() は str() に正規化（Builder早期リライト）。
- 互換: 既存の stringify() は当面エイリアス（内部で str() 相当へ誘導）。
Debug表示（構造的・安定）: repr(x)（将来導入、devのみ）
JSONシリアライズ: toJson(x)（文字列）/ toJsonNode(x)（構造）

Operators (precedence high→low)

Unary: ! ~ -
Multiplicative: * / %
Additive: + -
Compare: == != < <= > >=
Logical: && || (short‑circuit, side‑effect aware)

Semicolons and ASI (Automatic Semicolon Insertion)

Allowed to omit semicolon at:
- End of line, before } or at EOF, when the statement is syntactically complete.
Not allowed:
- Line break immediately after a binary operator (e.g., 1 +\n2)
- Ambiguous continuations; parser must Fail‑Fast with a clear message.

Truthiness (boolean context)

SSOT: reference/language/types.md（runtime truthiness）
実行上は Bool/Integer/Float/String/Void が中心。BoxRef は一部のコアBoxのみ許可され、その他は TypeError（Fail-Fast）。
null は void の別名（構文糖衣）。どちらも boolean context では TypeError。

Equality and Comparison

SSOT: reference/language/types.md（==/!= と < <= > >= の runtime 仕様）
== は一部の cross-kind（Integer↔Bool, Integer↔Float）を best-effort で扱う。その他は false。
< <= > >= は Integer/Float/String の 同型同士のみ（異型は TypeError）。

String and Numeric +

SSOT: reference/language/types.md（runtime + 仕様）
Integer+Integer, Float+Float は加算。片側が String なら文字列連結（相手は文字列化）。
それ以外（例: Integer+Bool, Integer+Float）は TypeError（Fail-Fast）。

Blocks and Control

if (cond) { ... } [else { ... }]
loop (cond) { ... } — minimal loop form
match (expr) { case ... } — MVP (literals and simple type patterns)

Using / SSOT

Dev/CI: file‑based using allowed for convenience.
Prod: nyash.toml only. Duplicate imports or alias rebinding is an error.

Errors (format)

Always: Error at line X, column Y: <message>
For tokenizer errors, add the reason and show one nearby line if possible.

Dev/Prod toggles (indicative)

NYASH_DEV=1 — developer defaults (diagnostics, tracing; behavior unchanged)
NYASH_ENABLE_USING=1 — enable using resolver
NYASH_ENTRY_ALLOW_TOPLEVEL_MAIN=1 — allow main as top‑level entry

Notes

Keep the language small. Prefer explicit conversions (int(x), str(x), bool(x)) in standard helpers over implicit coercions.
Builder rewrites method calls to keep runtime dispatch simple and consistent across backends.

3.7 KiB Raw Blame History Unescape Escape

Nyash Quick Reference (MVP)

3.7 KiB

Raw Blame History