c8063c9e41
net-plugin: modularize constants (consts.rs) and sockets (sockets.rs); remove legacy commented socket code; fix unused imports mir: move instruction unit tests to tests/mir_instruction_unit.rs (file lean-up); no semantic changes runner/pyvm: ensure using pre-strip; misc docs updates Build: cargo build ok; legacy cfg warnings remain as before
50 lines
2.4 KiB
Markdown
50 lines
2.4 KiB
Markdown
# Nyash Core Principles — Minimal Syntax, Zero Runtime, Visual Flow
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Status: design-only during freeze (no implementation changes)
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Core (one page summary)
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- Minimal syntax: `{ … }` + `->` + `|args|` or `_` for flow; guard chains as the canonical first-match form. No new `match` construct; normalize instead.
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- Zero-runtime lowering: always desugar to `let/if/call/ret/phi`. No new opcodes, no implicit closures.
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- Capture policy: capture by reference by default; mutation requires `mut` on the captured binding. Captures remain within the defining scope.
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- ASI/format: treat `->` as a low-precedence line-continue. Formatter aligns arrows vertically.
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Before/After (normalize view)
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- Each example documents Ny → normalized Ny → MIR intent (design-only):
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1) Flow serial: `{read} -> { |x| validate(x) } -> { |x| save(x) }`
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2) Guard chain: `guard c1 -> {A}; guard c2 -> {B}; else -> {C}`
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3) If horizontal: `if cond -> {A} else -> {B}`
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4) Range pattern: `guard ch in '0'..'9' -> { ... }`
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5) Digit helper: `acc = acc*10 + ch.toDigitOrNull()` (null-guarded)
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nyfmt alignment (visual flow)
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```
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{ fetch() }
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-> { validate(_) }
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-> { save(_) }
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```
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Domain demos (≤20 lines each)
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- ETL pipeline: `read -> validate -> normalize -> save`
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- Text/number parse: `guard ch in '0'..'9' -> { acc = acc*10 + ch.toDigitOrNull() }`
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- Mini state machine: guard-first horizontal description with `else` fallback
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Observability (spec hooks; design-only)
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- `NYASH_SCOPE_TRACE=1|json`: enter/exit + captures (JSONL: `sid`, `caps`, `ret`).
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- `NYASH_FLOW_TRACE=1`: desugared steps like `t0=B0(); t1=B1(t0);`.
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Runtime/API additions (docs-only at freeze)
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- `StringBox/Utf8Cursor`: `toDigitOrNull(base=10)`, `toIntOrNull()` — compile to simple comparisons/arithmetic.
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- Guard sugar: Range (`'0'..'9'`) and CharClass (`Digit`, `AZ`, `az`, `Alnum`, `Space`) — compile to bound checks.
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Acceptance & guardrails (freeze)
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- “No new grammar beyond sugar” and “no new VM opcodes” as hard rules during freeze.
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- Golden texts (Ny → MIR fragments) to lock compatibility where practical.
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- Lint proposals are documentation-only: single-use scope, long `->` chains, duplicated side effects.
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Related docs
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- proposals/scope-reuse.md — local scope reuse blocks (MVP)
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- design/flow-blocks.md — arrow flow + anonymous blocks
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- reference/language/match-guards.md — guard chains + range/charclass sugar
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- reference/language/strings.md — UTF‑8 first; proposed digit helpers
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