6ca56b0652
- ArrayLiteral/MapLiteralのAST定義追加
- パーサーで[...]と{...}構文をサポート
- MIR Builderでnew Box() + push/setへのdesugaring実装
- テストケースとスモークスクリプト追加
- CURRENT_TASK.mdにネームスペース解決Phase-1計画を追記
- 3段階解決順序（ローカル→エイリアス→プラグイン）の設計合意
111 lines
4.1 KiB
Markdown
111 lines
4.1 KiB
Markdown
# using — Imports and Namespaces (Phase 15+)
|
||
|
||
Status: Accepted (Runner‑side resolution). Selfhost parser accepts using as no‑op and attaches `meta.usings` for future use.
|
||
|
||
Policy
|
||
- Accept `using` lines at the top of the file to declare module namespaces or file imports.
|
||
- Resolution is performed by the Rust Runner when `NYASH_ENABLE_USING=1`.
|
||
- Runner strips `using` lines from the source before parsing/execution.
|
||
- Registers modules into an internal registry for path/namespace hints.
|
||
- Selfhost compiler (Ny→JSON v0) collects using lines and emits `meta.usings` when present. The bridge currently ignores this meta field.
|
||
|
||
## Namespace Resolution (Runner‑side)
|
||
- Goal: keep IR/VM/JIT untouched. All resolution happens in Runner/Registry.
|
||
- Default search order (3 stages, deterministic):
|
||
1) Local/Core Boxes (nyrt)
|
||
2) Aliases (nyash.toml [imports] / `needs … as …`)
|
||
3) Plugins (short name if unique, otherwise qualified `pluginName.BoxName`)
|
||
- On ambiguity: error with candidates and remediation (qualify or define alias).
|
||
- Modes:
|
||
- Relaxed (default): short names allowed when unique.
|
||
- Strict: require plugin prefix (env `NYASH_PLUGIN_REQUIRE_PREFIX=1` or nyash.toml `[plugins] require_prefix=true`).
|
||
- Aliases:
|
||
- nyash.toml `[imports] HttpClient = "network.HttpClient"`
|
||
- needs sugar: `needs plugin.network.HttpClient as HttpClient` (file‑scoped alias)
|
||
|
||
## Plugins
|
||
- Unified namespace with Boxes. Prefer short names when unique.
|
||
- Qualified form: `network.HttpClient`
|
||
- Per‑plugin control (nyash.toml): `prefix`, `require_prefix`, `expose_short_names`
|
||
|
||
## `needs` sugar (optional)
|
||
- Treated as a synonym to `using` on the Runner side; registers aliases only.
|
||
- Examples: `needs utils.StringHelper`, `needs plugin.network.HttpClient as HttpClient`, `needs plugin.network.*`
|
||
|
||
## nyash.toml keys (MVP)
|
||
- `[imports]`/`[aliases]`: short name → fully qualified
|
||
- `[plugins.<name>]`: `path`, `prefix`, `require_prefix`, `expose_short_names`
|
||
|
||
## Index and Cache (Runner)
|
||
- Build a Box index once per run to make resolution fast and predictable:
|
||
```
|
||
struct BoxIndex {
|
||
local_boxes: HashMap<String, PathBuf>,
|
||
plugin_boxes: HashMap<String, Vec<PluginBox>>,
|
||
aliases: HashMap<String, String>,
|
||
}
|
||
```
|
||
- Maintain a small resolve cache per thread:
|
||
```
|
||
thread_local! {
|
||
static RESOLVE_CACHE: RefCell<HashMap<String, ResolvedBox>> = /* ... */;
|
||
}
|
||
```
|
||
- Trace: `NYASH_RESOLVE_TRACE=1` prints resolution steps (for debugging/CI logs).
|
||
|
||
Syntax
|
||
- Namespace: `using core.std` or `using core.std as Std`
|
||
- File path: `using "apps/examples/string_p0.nyash" as Strings`
|
||
- Relative path is allowed; absolute paths are discouraged.
|
||
|
||
Style
|
||
- Place all `using` lines at the top of the file, before any code.
|
||
- One using per line; avoid trailing semicolons. Newline separation is preferred.
|
||
- Order: sort alphabetically by target. Group namespaces before file paths.
|
||
- Prefer an explicit alias (`as ...`) when the target is long. Suggested alias style is `PascalCase` (e.g., `Std`, `Json`, `UI`).
|
||
|
||
Examples
|
||
```nyash
|
||
using core.std as Std
|
||
using "apps/examples/string_p0.nyash" as Strings
|
||
|
||
static box Main {
|
||
main(args) {
|
||
local console = new ConsoleBox()
|
||
console.println("hello")
|
||
return 0
|
||
}
|
||
}
|
||
```
|
||
|
||
Qualified/Plugins/Aliases examples
|
||
```nyash
|
||
# nyash.toml
|
||
[plugins.network]
|
||
path = "plugins/network.so"
|
||
prefix = "network"
|
||
require_prefix = false
|
||
|
||
[imports]
|
||
HttpClient = "network.HttpClient"
|
||
|
||
# code
|
||
needs plugin.network.HttpClient as HttpClient
|
||
|
||
static box Main {
|
||
main(args) {
|
||
let a = new HttpClient() # alias
|
||
let b = new network.HttpClient() # qualified
|
||
}
|
||
}
|
||
```
|
||
|
||
Runner Configuration
|
||
- Enable using pre‑processing: `NYASH_ENABLE_USING=1`
|
||
- Selfhost pipeline keeps child stdout quiet and extracts JSON only: `NYASH_JSON_ONLY=1` (set by Runner automatically for child)
|
||
- Selfhost emits `meta.usings` automatically when present; no additional flags required.
|
||
|
||
Notes
|
||
- Phase 15 keeps resolution in the Runner to minimize parser complexity. Future phases may leverage `meta.usings` for compiler decisions.
|
||
- Unknown fields in the top‑level JSON (like `meta`) are ignored by the current bridge.
|