54 lines
2.1 KiB
Markdown
54 lines
2.1 KiB
Markdown
# Iteration 3 — compiler front (`woc`)
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> Format: `product/story-iteration-template`. Part of
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> [Story — one language, one runtime, one database, one binary](00-story.md).
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## Goals
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- An OCaml, stdlib-only compiler front end: `.wo` source becomes a typed
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AST with ownership annotations, or plain, precise diagnostics — the
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half of the language the developer converses with.
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- Ownership errors read like sentences naming both sites ("moved at
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pricing.wo:14, used at pricing.wo:17") — the ergonomics bet that makes
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MVS beat Rust for this audience.
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## Acceptance Criteria
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- What to achieve?
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- **Given** the pricing-demo classes,
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- **when** `woc` runs its front pipeline (lex → parse → typecheck →
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ownership),
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- **then** `--dump-ast` output matches the golden file and zero
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diagnostics are emitted.
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- What to achieve?
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- **Given** a file violating ownership rules (move-after-use, borrow
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escape, double exclusive borrow),
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- **when** it compiles,
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- **then** each violation reports a stable `WO-E###` code with both
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source sites, and one bad declaration does not stop diagnosis of the
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rest of the file.
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- What to achieve?
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- **Given** a class that satisfies an interface structurally,
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- **when** typechecking runs,
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- **then** satisfaction is recognized with no `implements` declaration,
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and per-method `self` mutability is inferred (reads shared, writes
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exclusive).
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## Out Of Scope
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- Bytecode emission and running anything (iteration 4).
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- The Haxe-parity adoptions (iteration 5) — milestone grammar only.
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## Info
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- Newline-significant lexing and the identifier gotchas mirror
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`crates/rt`'s lexer — grammar parity is a stated contract.
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- Architecture map: `compiler/plan/architecture.md` (pipeline, module
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contracts, study references).
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## Proposed Solution
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- Execute the existing plan: `compiler/plan/2026-08-01-woc-compiler-front.md`
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(diagnostics module, lexer, declaration/statement/expression parsers with
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skip-on-block, typechecker with field-kind derivation, MVS ownership pass
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producing the four emitter tables, driver + error catalog).
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