SWG-4A-06: level dispatch, root dispatch, and the level-2 skeleton by PhysShell · Pull Request #196 · PhysShell/griff

PhysShell · 2026-09-02T16:34:51Z

Scope

SWG-4A-06 only: admit language level 2, route on it, and ship the level-2 entry path complete enough that the level-1 line is provably untouched and the SWG-INF-06 budget is provably spent.

Base: main @ bff27ac663d6a00c2470001f4773cfa5f955c0d6.
Head: 0b40859de7b1149bf81d8e3a87f4faa49ea0c2a8.

header_level -> level dispatch -> root dispatch (pattern | score)

No exact scalar layer (4A-07), no structural tree (4A-08), no ScoreBuilder (4A-09), no error recovery (INF-05), no 4B/4C, no lifting, no UI. Level 2 is not frozen; Phase 4A stays open.

Commit evidence

Commit	Role	Evidence
`a8f7950`	RED	tests only; `E0432` on `parse_document`/`format_document`/`Document`, `E0433: could not find v2 in parser`, and `couldn't read parser/v2/lexer.rs`
`08a4be8`	GREEN	dispatcher, level-2 parser, level-2 lexer, level-2 formatter, `LANGUAGE_LEVEL = 2`, level-1 guard
`0a59d66`	review RED	the depth axis is wired but unfalsifiable; `E0603: function parse_score is private`
`76b77d0`	review FIX	the parse spends a budget its caller owns
`0b40859`	DOCS	slice boundary, prior-art survey, four decision entries

Five commits, each RED before its GREEN. Nothing rebased, squashed or amended after pushing.

What this slice accepts, exactly

swang 2

score {
    ppqn 960
}

ppqn is score's only 1 word and master_bar/track/source/loss are */? words (exact-score-text.md §6.4b), so the minimal empty score is a complete level-2 program rather than a stub. That is what makes "the parser may initially accept only a minimal empty score" a boundary rather than a shortcut.

Dispatch, and why level 1 is provably unmoved

Spec §5.4: "each released level owns its own parser and formatter entry point. A build routes to one of them and never mixes them: there is no single grammar with level-conditioned branches, because such a grammar has no way to prove that level 1's behaviour survived the addition of level 2."

syntax/document.rs is therefore a router and nothing else — no grammar, no token, no budget. It is deliberately absent from level_two_budget_boundary.rs's exempt list, because a budget consulted before the level branch is a level-1 bound whatever file it lives in.

Level 1's entry point gained a guard, and only for a level it does not own. Without it, header_level returning Ok(2) flowed into Level::new(2), a level-1 Program carried level 2, and the formatter emitted swang 2 above a pattern block — a document neither level would read back. It is SWG0401, the structural class level 1 already uses, not SWG0001: this build does support level 2, and §5.10 forbids one number carrying a second meaning. The arm cannot fire for a swang 1 source, so Law A is untouched by its existence, and law_a_baseline.rs's frozen 47-case artifact proves that rather than the claim resting on inspection.

Law A's invalid-body half is asserted, not assumed. swang 1 + a score root is compared diagnostic-for-diagnostic against the frozen entry point — identical code, message, span and order. The friendlier "score requires language level 2" that §5.5 warns about is exactly what this case forbids.

Law A's domain is not widened. The baseline deliberately excludes swang 2, so supporting level 2 is not a regression against it, and nothing here "repairs" the law by quietly enlarging its domain.

What it refuses, and who owns each refusal

master_bar, track, source and loss are real score words owned by SWG-4A-08. They are refused, with a message that says which task owns them — never skipped. A parser that ignores a word it does not implement is how exact text stops being exact.

Two registry codes are implemented, and only for ppqn: SWG0505 (leading zero) and SWG0506 (zero ppqn). The scalar layer proper — widths, non-zero types, rational tempo, ranges, pitch, velocity, meter, confidence, enums, escapes — stays 4A-07's, and SWG0507/SWG0508 are absent because no text this slice accepts can reach them. The alternative was parse_document("swang 2\n\nscore { ppqn 0 }") returning Ok — text §6.6 declares invalid, admitted into the accepted set of a level that has not frozen, which 4A-07 would then have to narrow. Refusing early is the cheaper mistake to correct.

Everything else fails closed: malformed root prefixes (scor, scores, bare score, truncated score {), trailing and concatenated material, an unknown field word, a repeated 1 word, a missing required word, values of the wrong shape, and a value that does not fit the field.

The three inherited SWG-INF-06 obligations, discharged

1 — budget wiring before the first successful swang 2 result. The budget is constructed in the level-2 entry and nowhere else, consulted before the work it bounds: source bytes pre-lex, tokens as each is retained, depth as the block is entered. level_two_budget_boundary.rs still passes, with parser/v2.rs and parser/v2/lexer.rs added to its exempt list one at a time exactly as its own comment requires.

2 — the end-to-end breach oracle. swang_parse gains the dispatched arm, so a fuzzed input reaching level 2 is held to Ok xor typed diagnostics and to the formatter laws. Two deterministic breaches drive the declared limits through the public path, with no scaling and no test-only reconstruction of the parser:

16 MiB of whitespace padding a grammatically valid minimal score — so the source would be accepted if the byte check were not consulted first, which is what makes it a witness that no successful swang 2 result precedes budget wiring, rather than a witness that a large string fails;
four million tokens plus one, spelled under the byte cap so the token axis is the one that fires.

3 — the wasm32 token-storage proof. The retained level-2 token is a kind and a Span: twelve bytes, no String, text sliced from the source on demand. The bound is a const assertion in the lexer rather than a host test, so it travels to every target the crate builds for — a runtime assertion on x86_64 proves x86_64. Level 1's String-owning Token is untouched; the two now differ on purpose.

admit_diagnostic is deliberately never called. The diagnostic cap governs what a recovering parser returns, and recovery is SWG-INF-05's. This parser stops at the first refusal, so it can no more exhaust that axis than level 1 can. INF-05 keeps that work whole.

Falsification

12 probes, 0 survivors at head. Five states, each decided by an actual observation.

Probe	Mutation	Result
P21	owned lexeme text on the level-2 token, on `wasm32`	CAUGHT-BY-COMPILE — the preregistered SWG-INF-06 probe
P22	the same, on the host	CAUGHT-BY-COMPILE
P23	the `const` size assertion removed	CAUGHT
P24	the source byte cap never consulted	CAUGHT
P25	the lexer retains tokens without admitting them	CAUGHT
P26	the parser never enters the block it opened	SURVIVED @ `08a4be8` → CAUGHT @ `76b77d0`
P27	an unimplemented `score` word silently skipped	CAUGHT
P28	trailing material after the root tolerated	CAUGHT
P29	the dispatcher sends level 2 to the level-1 parser	CAUGHT
P30	the level-1 entry point stops guarding its own level	CAUGHT
P31	`ppqn 0` accepted	CAUGHT
P32	a leading zero accepted	CAUGHT

P26 is the finding this round produced. Deleting enter_block was caught by nothing: the minimal score has one block, so depth can never approach 64 and no end-to-end breach can witness the counter. The wiring was correct and unfalsifiable, which is the state that rots. parse_score now spends a budget its caller owns, and the witness reads the counter after a refusal inside the block — where a depth still held is proof of entry, and a balanced parse would have returned zero either way and passed regardless.

That is not a side channel: there is no second entry that can succeed without spending the same budget, and Level2ResourceLimits still has private fields and declared() as its only production constructor, which INF-06 sealed for exactly this.

Inherited by 4A-08: when the structural tree makes nesting reachable from text, the depth cap earns an end-to-end breach of its own.

Public API added

pub enum Document { Pattern(Program), Score(ExactScore) }
pub fn parse_document(source: &str) -> Result<Document, Vec<Diagnostic>>
pub fn format_document(document: &Document) -> String
pub struct ExactScore   // opaque

ExactScore is opaque on purpose. SWG-4A-02 fenced ExactScoreDocument off the public surface so it could not quietly become a second durable model beside griff_core::Score, and the fence holds: exact_document_boundary.rs still passes all six of its tests, syntax.rs still names no part of the document, and 4A-02's own test anticipated this wiring by name. The handle exists so a level-2 parse has a public result at all — which is what lets the fuzz oracle reach the real path instead of a reconstruction.

Validation

Leg	Command	Result
swang	`cargo test -p griff-swang`	282 passed, 0 failed
core	`cargo test -p griff-core`	904 passed, 0 failed
pattern	`cargo test -p griff-pattern`	22 passed, 0 failed
cli	`cargo test -p griff-cli`	90 passed, 0 failed
ui-core	`cargo test -p griff-ui-core`	194 passed, 0 failed
format	`cargo fmt --all -- --check`	clean
lint	`cargo clippy --workspace --all-targets -- -D warnings`	exit 0
check	`cargo check --workspace --all-targets`	clean
wasm32	`cargo check -p griff-swang --target wasm32-unknown-unknown`	clean
wasm32	`cargo check -p griff-cockpit --target wasm32-unknown-unknown`	clean
fuzz	`cargo check` in `fuzz/`	clean — the new oracle arm type-checks

1490 tests, up from 1465 at bff27ac: +20 dispatch, +5 token storage, +2 depth accounting.

Two limitations, stated rather than worked around. cargo test --workspace cannot link in this container — rust-lld cannot find -lasound — and fails identically at the base commit; the per-package runs above cover the same tests, and CI is the acceptance source. cargo fuzz run needs nightly, which this container does not have; the fuzz crate is compile-checked on stable, and CI's twelve fuzz targets are the acceptance source for the corpus run.

Not in this diff

Verified by reading the complete diff, not by intention: no ScoreBuilder, no griff_core::Score construction, no canonical newtypes, no recovery logic. The five grep hits for those names across the production diff are all prose in doc comments and one test name. griff-core and cli/src are untouched.

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https://claude.ai/code/session_018vdRzztKXy8bA16tEzwgLE

Generated by Claude Code

Summary by CodeRabbit

New Features
- Added support for swang 2 documents with a minimal score { ppqn <n> } structure.
- Added automatic routing between level-1 and level-2 parsing and formatting.
- Added canonical formatting and source-map information for level-2 score documents.
Bug Fixes
- Level-1 parsing now clearly rejects unsupported level-2 documents.
- Improved diagnostics for invalid headers, duplicate or missing fields, invalid ppqn values, unsupported content, and resource-limit violations.
- Enforced valid language-level handling across parsing and AST validation.

… skeleton The acceptance contract for the level-2 entry path, written before it exists. Spec §5.4 requires a build to route to one level's entry point and never branch inside a shared grammar, "because such a grammar has no way to prove that level 1's behaviour survived the addition of level 2". These tests are that proof obligation. RED, for the intended reasons: swang/tests/level_two_dispatch.rs E0432: unresolved imports `format_document`, `parse_document`, `Document` — the dispatched public path does not exist yet. swang/src/syntax/tests.rs E0433: could not find `v2` in `parser`, and `couldn't read swang/src/syntax/parser/v2/lexer.rs` — the level-2 lexer, and with it the retained-token representation, does not exist yet. The matrix pins, beyond the happy path: an unknown newer level still refused by the frozen pre-parser and now naming `1..=2`; a malformed or truncated header still `SWG0002`; a level-2 `pattern` root refused (§5.7); a level-1 `score` root keeping the *identical* frozen refusal, compared diagnostic-for-diagnostic against the frozen entry point (Law A's invalid-body half, §5.5); malformed root prefixes; trailing and concatenated material; the grammatical `score` words this slice does not implement failing closed rather than being skipped; and the two registry refusals reachable from the one scalar it reads. The three inherited SWG-INF-06 obligations are tests, not prose. The source-byte breach pads a *grammatically valid* minimal score with whitespace, so the source would be accepted if the byte check were not consulted first — which is what makes it a witness that no successful `swang 2` result precedes budget wiring, rather than a witness that a large string fails. The token breach spells four million tokens plus one under the byte cap. Both run the declared limits through the public path, with no scaling and no test-only reconstruction of the parser. The `wasm32` token-storage proof asserts the retained token fits twelve bytes, that its text is sliced from the source span rather than owned, and that the binding assertion is the compile-time one — a host-only runtime check would prove x86_64 and call it a platform proof. `level_two_budget_boundary.rs` gains the two level-2 modules on its EXEMPT list, one at a time as its own comment requires. `syntax.rs` and the dispatcher deliberately stay off it: a budget consulted before the level branch is a level-1 bound whatever file it lives in. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018vdRzztKXy8bA16tEzwgLE

`header_level -> level dispatch -> root dispatch (pattern | score)`. Spec §5.4 gives each released level its own parser and formatter entry point and forbids a shared grammar with level-conditioned branches. So the dispatcher in `syntax/document.rs` is a router and nothing else: it holds no grammar, no token, no budget, and decides only which parser to call. It is deliberately absent from `level_two_budget_boundary.rs`'s exempt list — a budget consulted before the level branch would be a level-1 bound whatever file it lived in. `LANGUAGE_LEVEL` becomes 2. The frozen §1.1 pre-parser is untouched; what moved is the range it reports, which has to be the range the build actually has or `SWG0001` would name a lie. Level 1's entry point gains a guard, and only for a level it does not own. Without it a `swang 2` header would flow into a level-1 `Program`, and the formatter would emit `swang 2` above a `pattern` block — a document neither level would read back. It is `SWG0401`, the structural class level 1 already uses, not `SWG0001`: this build does support level 2, and §5.10 forbids one number carrying a second meaning. The arm cannot fire for a `swang 1` source, so Law A is untouched by its existence. The level-2 lexer retains a token that is a kind and a `Span` — 12 bytes, no `String`, text sliced back out of the source on demand. The bound is a `const` assertion in the lexer rather than a host test, so it travels to every target this crate builds for; `cargo check -p griff-swang --target wasm32-unknown-unknown` and the cockpit's wasm build both compile it. The parser accepts exactly the minimal empty score, `score { ppqn <n> }`, and refuses everything else closed. `master_bar`, `track`, `source` and `loss` are real grammar owned by SWG-4A-08, and the refusal says so instead of pretending they are not words — but it is a refusal, because a parser that ignores a word it does not implement is how exact text stops being exact. The two registry codes implemented here, `SWG0505` and `SWG0506`, are the ones reachable from the single scalar this slice reads; the scalar layer proper stays SWG-4A-07's. Accepting `ppqn 0` — text §6.6 declares invalid — into an unfrozen level's accepted set was the alternative, and it is worse than implementing two lines of refusal. `admit_diagnostic` is deliberately never called: the diagnostic cap governs what a *recovering* parser returns, and recovery is SWG-INF-05's. This parser stops at the first refusal, so it can no more exhaust that axis than level 1 can. Local: 1490 tests green (904 core + 280 swang + 22 pattern + 90 cli + 194 ui-core), fmt clean, `clippy --workspace --all-targets -D warnings` exit 0, `check --workspace --all-targets` clean, wasm32 clean. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018vdRzztKXy8bA16tEzwgLE

…able A falsification probe found it the honest way. Deleting `enter_block` from the level-2 parser was caught by **nothing**: the minimal score has exactly one block, so nesting can never approach `MAX_NESTING_DEPTH` and no end-to-end breach can witness the accounting the backlog asks for ("structural-depth accounting during parsing"). Two witnesses that observe the counter directly, on the real parse function with the real budget rather than a reconstruction of it. The first is the one that can fail: a refusal *inside* the block returns before `leave_block`, so a depth of one proves the block was entered — where a balanced parse returns the counter to zero whether it was entered or not, and would have passed either way. RED: `E0603: function parse_score is private` — the witness needs the real entry to take the caller's budget, and it does not yet. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018vdRzztKXy8bA16tEzwgLE

`parse_score` takes `&mut Level2Budget` instead of constructing one it then drops. `parse_exact` is unchanged in behaviour: it builds the declared budget and hands it in, so the production path spends exactly what it spent before. What changes is that the accounting is now observable on the real function. The counters can be read after a parse — including after a refusal, which is the case that matters: a depth still held at one is proof the block was entered, where a balanced parse returns the counter to zero whether it was entered or not. This is not a side channel. There is no second entry that can succeed without consuming the same budget, and the budget cannot be weakened by the caller: `Level2ResourceLimits` has private fields and `declared()` as its only production constructor, which SWG-INF-06 sealed for exactly this. P26 the parser never enters the block it opened SURVIVED @ 08a4be8 → CAUGHT @ this commit 282 swang tests green, fmt clean, clippy -D warnings exit 0, wasm32 clean. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018vdRzztKXy8bA16tEzwgLE

… inherit The backlog entry records what this task accepts (`score { ppqn <n> }`, a complete level-2 program rather than a stub, because the structural blocks are `*`/`?` words), what it refuses and who owns each refusal, and the three inherited SWG-INF-06 obligations as discharged rather than claimed. One item is inherited by 4A-08 and was found by falsification rather than assumed: the depth axis cannot breach end-to-end in a grammar with one block. When the structural tree makes nesting reachable from text, the depth cap earns an end-to-end breach of its own. Four decision-log entries. The prior-art survey AGENTS.md requires covers the one genuinely new mechanism, the non-owning token: `rustc_lexer` keeps text in the source buffer behind a kind and a length, `rowan` interns rather than owning per occurrence, `logos` hands the caller a `Span` to slice. The twelve-byte bound is not theirs — it is §5.11's derivation from `MAX_TOKENS` and the cockpit's `wasm32` heap, and the compile-time assertion enforcing it is this task's. Recording a survey is not a licence to claim more inheritance than there is. The other three record the level-1 guard and why it is `SWG0401` and not `SWG0001`; why two of 4A-07's registry codes are implemented one task early for `ppqn` alone; and the survived probe that made the parse spend a budget its caller owns. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018vdRzztKXy8bA16tEzwgLE

coderabbitai · 2026-09-02T16:34:59Z

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docs/decisions.log.md
swang/src/syntax/document.rs
swang/src/syntax/format/v2.rs
swang/src/syntax/parser/v2.rs
swang/tests/level_two_dispatch.rs

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swang/src/syntax/format/v2.rs
docs/decisions.log.md

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📝 Walkthrough

Walkthrough

The syntax layer now supports level-2 document dispatch, parsing, formatting, diagnostics, source maps, and resource budgets. Level 1 remains separately parsed. Level 2 accepts the minimal score { ppqn <n> } grammar with bounded span-based tokens.

Changes

Level-two parser and dispatch

Layer / File(s)	Summary
Header and document dispatch `swang/src/syntax/document.rs`, `swang/src/syntax/header.rs`, `swang/src/syntax/parser/v1.rs`, `swang/src/syntax/ast/v1.rs`, `swang/src/syntax/source_map.rs`, `swang/src/syntax.rs`, `swang/tests/level_two_dispatch.rs`	The supported language level is 2. Document parsing routes level 1 and level 2 to separate implementations. The level-1 parser rejects level-2 input with `SWG0401`.
Level-two score parser and bounded lexer `swang/src/syntax/parser/v2.rs`, `swang/src/syntax/parser/v2/lexer.rs`, `swang/src/syntax/tests.rs`, `docs/decisions.log.md`	The parser accepts one `score` root with one canonical, non-zero `ppqn` value. The lexer retains token kinds and spans, enforces source and token budgets, and records depth changes. Unsupported words and malformed structures produce typed diagnostics.

Formatting and validation

Layer / File(s)	Summary
Canonical formatting and round-trip oracle `swang/src/syntax/format.rs`, `swang/src/syntax/format/v2.rs`, `fuzz/fuzz_targets/swang_parse.rs`, `swang/tests/level_two_dispatch.rs`	The formatter emits canonical `swang 2` score text. Tests and fuzzing validate reparsing, formatting fixed points, root preservation, and diagnostic spans.
Grammar, source-map, and budget validation `swang/src/syntax/tests.rs`, `swang/tests/level_two_dispatch.rs`, `swang/tests/level_two_budget_boundary.rs`, `docs/swang/foundation-backlog.md`	Tests cover grammar refusals, invalid `ppqn` values, source and token budget breaches, token storage bounds, depth accounting, source-map spans, and level-1 isolation. The SWG-4A-06 backlog entry is marked done.

Estimated code review effort: 4 (Complex) | ~45 minutes

Merge Risk: ⚪ Minimal · up to 08285

This change adds level-2 score parsing, formatting, source maps, and budgeted dispatch while retaining separate level-1 handling. No current merge-blocking risk remains.

Sequence Diagram(s)

sequenceDiagram
  participant Source
  participant HeaderParser
  participant DocumentParser
  participant LevelTwoParser
  participant Formatter
  Source->>HeaderParser: read language level
  HeaderParser->>DocumentParser: return level 2
  DocumentParser->>LevelTwoParser: parse score document
  LevelTwoParser-->>DocumentParser: return Score or diagnostics
  DocumentParser->>Formatter: format Score
  Formatter-->>Source: return canonical text

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Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main changes: level and root dispatch, plus the new level-2 parser skeleton.
Docstring Coverage	✅ Passed	Docstring coverage is 85.07% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 67 functions across 15 files. (1 skipped: 1…
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PhysShell · 2026-09-02T16:50:02Z

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PhysShell · 2026-09-02T16:50:24Z

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Inline comments:
In `@fuzz/fuzz_targets/swang_parse.rs`:
- Line 106: Update the Document::Score match arm in the reparsed AST comparison
to assert equality between the original and reparsed score values, using the
existing law-3 assertion message, so ppqn changes are detected.

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📒 Files selected for processing (15)

docs/decisions.log.md
docs/swang/foundation-backlog.md
fuzz/fuzz_targets/swang_parse.rs
swang/src/syntax.rs
swang/src/syntax/document.rs
swang/src/syntax/format.rs
swang/src/syntax/format/v2.rs
swang/src/syntax/header.rs
swang/src/syntax/parser.rs
swang/src/syntax/parser/v1.rs
swang/src/syntax/parser/v2.rs
swang/src/syntax/parser/v2/lexer.rs
swang/src/syntax/tests.rs
swang/tests/level_two_budget_boundary.rs
swang/tests/level_two_dispatch.rs

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chatgpt-codex-connector · 2026-09-02T16:57:06Z

+/// SWG-4A-06 raised this to 2. The pre-parser below is unchanged — that is
+/// what "frozen" means — and what moved is the range it reports, which has
+/// to be the range the build actually has or `SWG0001` would name a lie.
+pub const LANGUAGE_LEVEL: u32 = 2;


Keep the v1 AST level fixed at one

When callers construct the public level-1 Program directly, this global bump also makes Level::new(2) succeed because ast/v1.rs validates against LANGUAGE_LEVEL. format(&program) then emits a swang 2 header over a pattern root, while both the new v1 guard and parse_document reject that text, breaking the documented parse(format(ast)) == ast guarantee for every constructible AST. Keep the v1 Level constructor restricted to level 1 or otherwise make this mixed value unconstructible.

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chatgpt-codex-connector · 2026-09-02T16:57:06Z

+    let level = header_level(source).map_err(|d| vec![d])?;
+    match level {
+        1 => parser::v1::parse(source).map(Document::Pattern),
+        2 => parser::v2::parse_exact(source).map(Document::Score),


Add source-map support to the level-2 dispatch

The SWG-4A-06 acceptance contract in docs/swang/foundation-backlog.md:800-802 says the parser skeleton ships with a source map, and the existing Parsed<T> is explicitly generic so level 2 can use it. This arm instead returns only a bare ExactScore; the v2 parser builds no SourceMap, adds no score/PPQN AstId or FieldKind, and exposes no dispatched map-bearing entry point. Consequently a caller cannot locate successfully parsed level-2 constructs, and later builder diagnostics cannot point back to their source without reparsing.

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chatgpt-codex-connector · 2026-09-02T16:57:06Z

+    source: &str,
+    budget: &mut Level2Budget,
+) -> Result<ExactScoreDocument, Diagnostic> {
+    budget.admit_source(source, span_of(0, source.len()))?;


Point source-budget failures at the header

For every supported swang 2 source exceeding 16 MiB, this supplies 0..source.len() as the SWG0509 location, causing the diagnostic to highlight the entire oversized document. The breach-location contract in docs/swang/spec.md:921-928, repeated by Level2Budget::admit_source, requires a source-byte breach to point at the level/header span because no body token has been admitted. Pass the actual header-level span here instead.

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chatgpt-codex-connector · 2026-09-02T16:57:06Z

+                (Document::Pattern(a), Document::Pattern(b)) => {
+                    assert_eq!(a, b, "parse(format(ast)) == ast (law 3)");
+                }
+                (Document::Score(_), Document::Score(_)) => {}


Compare level-2 ASTs in the fuzz round trip

When format_exact changes or begins emitting the existing structural fields, a lossy formatter can still reparse to its own fixed point while changing the AST, but this branch accepts every Score/Score pair without comparing them. For example, a formatter that always emits ppqn 960 would pass this alleged law-3 oracle for an input containing ppqn 480. Since ExactScore derives Eq, assert a == b here so the mandatory format-adapter fuzzing detects score-data corruption.

AGENTS.md reference: AGENTS.md:L106-L107

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…rsed CodeRabbit, on 0b40859: the fuzz oracle's `Document::Score` arm checked only the root variant, so "a formatter that changes `ppqn` still passes this oracle". Verified by probe rather than by reading — replacing the interpolated `ppqn` with the literal 960 in `format_exact` **SURVIVED** the whole suite. Two reasons it survived, and both are fixed: * the fuzz arm asserted nothing about the value, where level 1's arm asserts `assert_eq!(a, b)`. It now does the same; * every level-2 fixture used `ppqn 960`, so a formatter emitting the literal 960 round-tripped through fixtures that could not tell the difference. The new case uses 1, 480 and 65535 — values the canonical text cannot supply by accident — and asserts the parsed documents are equal, not merely the same variant. This is the law-2/law-3 gap in miniature. A formatter emitting a constant *is* its own fixed point, so `format(parse(format(x))) == format(x)` held throughout; what failed was `parse(format(ast)) == ast`, which nothing asserted at level 2. P33 the formatter emits a constant ppqn, dropping the parsed value SURVIVED @ 0b40859 → CAUGHT @ this commit Also stated, for CodeRabbit's second observation — that a malformed parse can leave nesting state on a reused budget: **one budget, one parse**. A refusal returns with what it had spent, depth included, deliberately, since that is the evidence the block was entered; `parse_exact` constructs a fresh budget every time, so no production path reuses one. A future caller wanting to bound a *sequence* of parses is declaring a different bound than §5.11's per-source one, and should say so rather than inherit it by accident. The contract is now in `parse_score`'s doc instead of being relied upon. 283 swang tests green, fmt clean, clippy -D warnings exit 0, wasm32 clean, fuzz crate compile-checked. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018vdRzztKXy8bA16tEzwgLE

…inned All three checked against primary sources before writing a line, and all three hold. **P1 — a level-1 AST can carry level 2.** `ast::v1::Level::new` validates against `LANGUAGE_LEVEL`, so raising the constant silently made `Level::new(2)` succeed. `Program`'s fields are `pub`, so a caller can build one and `format` renders `swang 2` above a `pattern` root — text both the new v1 guard and `parse_document` refuse. `parse(format(ast)) == ast` is therefore broken for an AST anyone can construct. The parser guard I added closed the parse path and left the construction path open; this closes it. **P2 — the source map is in the acceptance contract and was skipped.** `docs/swang/foundation-backlog.md:800-802`: "the skeleton ships complete: a typed root enum, the source map, deterministic diagnostics, resource budgets, and formatter dispatch." `Parsed<T>` is generic precisely so level 2 can use it. Without it a caller cannot locate a parsed level-2 construct and 4A-09's builder would have to reparse to point anywhere. **P2 — the source-byte breach points at the whole document.** Spec §5.11's breach-location table is explicit: "source bytes → the level/header span — no body token has been admitted". I passed `0..source.len()`, which highlights sixteen megabytes and calls it a location — and I quoted that same table in the PR body while violating it. The fourth finding, comparing level-2 ASTs in the fuzz round trip, is the one CodeRabbit raised independently and is already fixed at 3a3e141. RED, for the intended reasons: `E0432` on `parse_document_with_source_map`, `E0599` on `AstId::Score` and `FieldKind::Ppqn`. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018vdRzztKXy8bA16tEzwgLE

Three Codex findings, all verified against primary sources first. **P1 — the level-1 AST now spells level 1.** `ast::v1::Level::new` compared against `LANGUAGE_LEVEL`, so raising the constant silently admitted `Level::new(2)`; `Program`'s fields are `pub`, so the mixed value was constructible and `format` rendered `swang 2` above a `pattern` root. Both entry points refuse that text, so `parse(format(ast)) == ast` failed for an AST anyone could build. The guard I added last round closed the parse path and left this one open — a narrower fix than the defect. The value is now unconstructible rather than merely unreachable. **P2 — the source-byte breach points at the level digits.** Spec §5.11: "source bytes → the level/header span — no body token has been admitted". It was `0..source.len()`, which highlights sixteen megabytes and calls it a location. Doubly worth fixing because the PR body quoted that table while the code contradicted it. **P2 — the source map the skeleton contract asked for.** `AstId::Score` and `FieldKind::Ppqn` join the enums additively; the parser records the root as its keyword through its closing brace and `ppqn` as the value rather than the word introducing it, the convention level 1's map already follows. `parse_document_with_source_map` dispatches like its unmapped twin, and each level contributes its own level's map, because a location belongs to the grammar that read it. `parse_exact` is now the mapped parser with the map dropped, so the two cannot drift in what they accept. P34 the AST validates against LANGUAGE_LEVEL again → CAUGHT P35 the breach points at the whole document again → CAUGHT P36 the parser records no score node → CAUGHT P37 the parser records no ppqn field → CAUGHT 286 swang tests green, fmt clean, clippy -D warnings exit 0, wasm32 clean, fuzz crate compile-checked. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018vdRzztKXy8bA16tEzwgLE

PhysShell · 2026-09-02T20:15:43Z

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PhysShell · 2026-09-02T20:15:48Z

@codex review

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coderabbitai · 2026-09-02T20:15:57Z

@PhysShell I will review the current changes in PR #196.

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chatgpt-codex-connector

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Reviewed commit: 6d1775dab9

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chatgpt-codex-connector · 2026-09-02T20:19:21Z

+        if level != LEVEL_ONE {
            return Err(AstError::UnsupportedLevel { level });


Report the v1-only level constraint accurately

When a public caller invokes Level::new(2), this correctly returns UnsupportedLevel, but that error's Display now says language level 2 is not supported (1..=2), and the type-level rustdoc still describes every level through LANGUAGE_LEVEL as valid. Since this commit raises LANGUAGE_LEVEL to 2 while restricting this constructor to 1, the resulting public error and API documentation are self-contradictory; describe the constraint as “level 1 only” rather than using the build-wide supported range.

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Codex, on 6d1775d: the previous fix pinned `ast::v1::Level::new` to level 1 but left its refusal printing the *build's* supported range. With `LANGUAGE_LEVEL` raised to 2 the public error now reads language level 2 is not supported (1..=2) — it refuses a level and, in the same breath, lists that level as supported. Nothing in the suite noticed, because every existing assertion checks the *verdict* (`is_err`) and none reads the message. RED: for every level the constructor refuses, the message must name that level and must not present a supported range containing it. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018vdRzztKXy8bA16tEzwgLE

The constructor was already right; only what it said about itself was wrong. `AstError::UnsupportedLevel`'s `Display` interpolated the build's `LANGUAGE_LEVEL`, so raising that constant to 2 turned the refusal of level 2 into "language level 2 is not supported (1..=2)". The two doc comments carried the same stale claim: the variant said "newer than LANGUAGE_LEVEL" and the type said "at most LANGUAGE_LEVEL", when the constraint this AST enforces — and has to enforce, per spec §5.4 — is level 1 and nothing else. The message now names the constraint the code has: the level-1 AST spells level 1; it cannot carry level {level} `LANGUAGE_LEVEL` is no longer imported here at all, which is the point: the level-1 tree does not consult the build's range to decide what it can spell. The two doc comments still link to it, now by path, to say exactly that — a build understanding a level says nothing about which tree carries it. Scope: message and prose only. The verdicts are unchanged, and the existing `a_level_one_ast_cannot_carry_level_two` still pins them. The doc-comment half of the change is prose and is not machine-pinned; the message half is, by the RED above. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018vdRzztKXy8bA16tEzwgLE

…range Records the decision behind the message fix: the level-1 tree asking the build what it may spell is the same error as the constructor bug, one layer out. `SWG0001` in the header stays the one place the build-wide range is named, because there the range is the subject. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018vdRzztKXy8bA16tEzwgLE

PhysShell · 2026-09-03T05:02:35Z

@coderabbitai review

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PhysShell · 2026-09-03T05:02:39Z

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coderabbitai · 2026-09-03T05:02:47Z

@PhysShell I will review the current changes in PR #196.

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chatgpt-codex-connector · 2026-09-03T05:05:34Z

Codex Review: Didn't find any major issues. Can't wait for the next one!

Reviewed commit: fd8370ce63

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PhysShell · 2026-09-03T05:07:57Z

State at `fd8370c` — the description above describes `0b40859`

Six commits landed after the description was written, all of them review rounds. This comment carries the delta rather than rewriting the body, so the original evidence stays readable as what it was when it was written.

Commits

Eleven, each RED before its GREEN. Nothing rebased, squashed or amended after pushing — the order is the evidence.

Commit	Role	Evidence
`a8f7950`	RED	tests only; `E0432` on `parse_document`/`format_document`/`Document`, `E0433: could not find v2 in parser`
`08a4be8`	GREEN	dispatcher, level-2 parser, lexer, formatter, `LANGUAGE_LEVEL = 2`, level-1 guard
`0a59d66`	review RED	the depth axis is wired but unfalsifiable; `E0603: function parse_score is private`
`76b77d0`	review FIX	the parse spends a budget its caller owns
`0b40859`	DOCS	slice boundary, prior-art survey, four decision entries
`3a3e141`	review	law 3 at level 2, and the value it parsed
`55f989f`	review RED	three Codex findings, verified against the spec then pinned
`6d1775d`	review FIX	the AST's level, the breach span, the dispatched source map
`5645ee1`	review RED	a refusal that lists what it refuses
`3ac4d2f`	review FIX	the level-1 AST's refusal says level 1, not the build's range
`fd8370c`	DOCS	why the level-1 AST stops quoting the build range

Falsification — 19 probes, 0 survivors at head

P21–P32 are in the description. Added since:

Probe	Mutation	Result
P33	the formatter emits a constant `ppqn`	SURVIVED @ `0b40859` → CAUGHT @ `3a3e141`
P34	the level-1 AST accepts any level the build supports	CAUGHT
P35	the source-byte breach points at the whole document	CAUGHT
P36	the level-2 parse records no `score` node	CAUGHT
P37	the level-2 parse records no `ppqn` field	CAUGHT
P38	the level-1 AST's refusal quotes the build's range again	CAUGHT
P39	that refusal stops naming the level it rejected	CAUGHT

P33 is the second survivor this branch produced. The fuzz arm read (Document::Score(_), Document::Score(_)) and every fixture used ppqn 960, so a formatter emitting a constant would have been its own fixed point and passed law 2 and law 3 alike. The arm now compares the values, and the round trip is exercised at ppqn 1, 480 and 65535.

Review rounds

Every finding was checked against docs/swang/spec.md and the code before anything changed; none was accepted on authority.

Round	Reporter	On	Outcome
1	CodeRabbit	`0b40859`	1 finding — the level-2 fuzz arm compared roots, not scores. Confirmed; it is P33.
1	Codex	`0b40859`	4 findings, all confirmed; one already fixed by P33's commit. Two were defects this slice introduced that its own probe matrix had missed.
2	Codex	`6d1775d`	1 finding — `Level::new` was pinned to level 1 but its `Display` still interpolated `LANGUAGE_LEVEL`, so refusing level 2 read `language level 2 is not supported (1..=2)`. Confirmed; it is P38/P39.
2	CodeRabbit	`6d1775d`	No actionable comments.
3	Codex	`fd8370c`	No major issues.
3	CodeRabbit	`fd8370c`	No actionable comments.

CodeRabbit reviews incrementally, so its clean result on fd8370c is the union of three runs — 0b40859 (15 files), 6d1775d (8 files, 2 skipped as similar to previous changes) and fd8370c (3 files, 1 skipped) — not a single pass over the whole diff. Codex re-read the full PR on each explicit trigger.

One observation was reported and deliberately not "fixed." CodeRabbit's merge-risk note on 6d1775d said a malformed level-2 document leaves a reused budget's nesting depth partially consumed. That is accurate and intentional: the residue after a refusal is P26's witness, since a balanced parse returns to zero whether or not the block was entered. parse_score's doc comment states the contract — one budget, one parse — and parse_exact_with_source_map builds a fresh Level2Budget::declared() on every call, so no production path can reuse one. Resetting depth on the error path would put P26 straight back to SURVIVED. Making a second admit_source on a spent budget fail closed would seal it without losing the witness; that is a candidate follow-up, not a change made here. The note's absence from the latest summary is a per-run recomputation over three files, not a retraction.

Public API added

pub enum Document { Pattern(Program), Score(ExactScore) }
pub fn parse_document(source: &str) -> Result<Document, Vec<Diagnostic>>
pub fn parse_document_with_source_map(source: &str) -> Result<Parsed<Document>, Vec<Diagnostic>>
pub fn format_document(document: &Document) -> String
pub struct ExactScore   // opaque

parse_document_with_source_map is new since the description — it discharges Codex's round-1 P2, which read the acceptance contract's "the skeleton ships with a source map" against a dispatch that returned a bare ExactScore.

Validation at `fd8370c`

Leg	Command	Result
swang	`cargo test -p griff-swang`	287 passed, 0 failed
core	`cargo test -p griff-core`	904 passed, 0 failed
pattern	`cargo test -p griff-pattern`	22 passed, 0 failed
cli	`cargo test -p griff-cli`	90 passed, 0 failed
ui-core	`cargo test -p griff-ui-core`	194 passed, 0 failed
format	`cargo fmt --all -- --check`	clean
lint	`cargo clippy --workspace --all-targets -- -D warnings`	exit 0
wasm32	`cargo check -p griff-swang --target wasm32-unknown-unknown`	clean
wasm32	`cargo check -p griff-cockpit --target wasm32-unknown-unknown`	clean
fuzz	`cargo check` in `fuzz/`	clean
docs	`cargo doc -p griff-swang --no-deps`	no new warnings — the two reported are pre-existing in `eval.rs` and `syntax.rs`

1497 tests, up from 1465 at bff27ac. CI green 14/14 on fd8370c (run 33679584400).

The two limitations in the description still hold and are unchanged: cargo test --workspace cannot link in this container (rust-lld cannot find -lasound, identically at the base commit), and cargo fuzz run needs nightly, so CI's twelve fuzz targets remain the acceptance source for the corpus run.

Level 2 is not frozen and Phase 4A stays open.

Generated by Claude Code

`parse_document_with_source_map`'s doc says `parse_document` "is this function with the map dropped, so the two cannot drift in what they accept or how they refuse". No such delegation exists: `document.rs` holds two independent dispatches, each calling `header_level` for itself. The sentence is true one layer down — `v1::parse` and `v2::parse_exact` really are their map-bearing twin with the map dropped — and appears to have travelled up to a module where nothing implements it. Two probes say the *behaviour* is well covered, so this is prose overclaiming rather than a live bug: P40 the plain router alone diverges on the invalid level-1 path CAUGHT — by the Law A refusal test, which guards level 1 only P41 the plain router alone diverges on the invalid level-2 path CAUGHT — 10 tests, including the sampling test below But both probes are gross divergences. What no test can observe is the structural claim itself: that there is one decision point. A behavioural test only samples inputs, and two routers agreeing on every input a suite happens to try is what a second router looks like until it isn't. RED: the level is read exactly once in `document.rs`. Lexical, because the claim is structural — the same instrument `level_two_budget_boundary.rs` and the retained-token size assertion already use for claims of this kind. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018vdRzztKXy8bA16tEzwgLE

`parse_document` now is what its neighbour's doc always said it was: `parse_document_with_source_map` with the map dropped. The duplicate `match level` and the second `header_level` call are gone, so the level is decided once and the two entry points cannot drift because there are no longer two things to keep in step. P42 the second router is reintroduced, behaviour identical CAUGHT — and only by `the_router_decides_the_level_once` That probe is the argument for a lexical test. With the duplicate restored the suite ran 287 passed / 1 failed under `--no-fail-fast`: every behavioural test agreed, because a freshly duplicated router does agree. It agrees until someone edits one copy. `v2::parse_exact` was the casualty and is deleted rather than kept alive for symmetry: the router took its only caller, and `-D dead-code` is right that a `pub(crate)` wrapper with no one behind it is not an API. Level 1 keeps `v1::parse`, which has callers. The doc links that pointed at `parse_exact` now point at `parse_exact_with_source_map`, and `format/v2.rs` states its two laws over the level-2 parse rather than over a function that no longer exists. The sampling test keeps its job and gains an honest description: it samples the agreement, and the structural test is what makes that agreement more than a coincidence this corpus happens to confirm. 288 swang tests green, fmt clean, clippy -D warnings exit 0, wasm32 clean, fuzz crate compile-checked, no new rustdoc warnings. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018vdRzztKXy8bA16tEzwgLE

…exical Records why the duplicate router was invisible to 287 behavioural tests: a freshly copied router agrees with its original, so only the structure distinguishes them. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018vdRzztKXy8bA16tEzwgLE

PhysShell · 2026-09-03T08:36:51Z

@coderabbitai review

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PhysShell · 2026-09-03T08:36:55Z

@codex review

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coderabbitai · 2026-09-03T08:37:05Z

@PhysShell I will review the current changes in PR #196.

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chatgpt-codex-connector · 2026-09-03T08:37:07Z

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claude added 5 commits September 2, 2026 16:22

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claude added 3 commits September 2, 2026 16:59

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claude added 3 commits September 2, 2026 20:21

claude added 3 commits September 3, 2026 05:27

PhysShell merged commit 7c0c328 into main Sep 3, 2026
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		if level != LEVEL_ONE {
		return Err(AstError::UnsupportedLevel { level });

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Scope

Commit evidence

What this slice accepts, exactly

Dispatch, and why level 1 is provably unmoved

What it refuses, and who owns each refusal

The three inherited SWG-INF-06 obligations, discharged

Falsification

Public API added

Validation

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Summary by CodeRabbit

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Sequence Diagram(s)

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PhysShell commented Sep 3, 2026

State at fd8370c — the description above describes 0b40859

Commits

Falsification — 19 probes, 0 survivors at head

Review rounds

Public API added

Validation at fd8370c

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