feat(lang): Astro (.astro) — frontmatter on the TypeScript grammar, via one included range

[sclyde]

Closes #67.

Astro support, frontmatter-only, along the route @snrmwg and @joyful-ii-V-I converged on in the issue. No grammar is vendored and no Lang enumerator is added.

The three things the review is about

1. The parse rate (STEP 0)

Measured on 1902 real .astro files before any code: withastro/docs, withastro/astro, withastro/starlight, onwidget/astrowind, satnaing/astro-paper, and two private Astro sites. Clones are shallow and not committed, per bench/recalleval/extcorpus.lock's rationale.

config	files degraded	median ERROR-byte ratio
baseline (today)	— all 1902 invisible as unindexed="astro:N"	—
wholesale TypeScript grammar	1878 / 1902 (98.7%)	0.33 – 1.00
frontmatter-only (this PR)	1 / 1902 (0.05%)	0.000

.metal ships at 0.0081 ERROR bytes and the C grammar was rejected for CUDA at 0.123, so wholesale Astro is 27×–120× worse than the option already turned down — which is why the template is refused rather than error-recovered. The one degraded file is astro-frontmatter-syntax-error.astro, which Astro ships deliberately to test its own error reporting.

What it recovers: astrowind files=54→145, edges=88→137; astro-paper edges=40→75; starlight edges=1351→1381; docs edges=2276→2309.

2. The design

{ ".astro", Lang::TypeScript, &tree_sitter_typescript, "typescript" } — the same shape as .tsx/.mts and .metal/.cu. The parse is restricted to the --- frontmatter by the first ts_parser_set_included_ranges() call in this tree, applied at all three parse drivers so the symbol index, the span tiers and --ast-query cannot disagree.

Lang::TypeScript is load-bearing, not a shortcut: langCompatible() admits only same-Lang, C-family and JVM pairs, so a Lang::Astro would not resolve a frontmatter call into the .ts service it imports — which is the entire point of the issue. The cost is that an .astro file reports lang="ts", and that is disclosed.

.astro also joins includeLangOf (src/resolve.h) in the same commit, for the reason .metal/.cu/.cuh did: it is dependency-capable, so without that row it would enter the dep_files= denominator and never resolve. test/deplangscheck.sh arm (G) refuses that, and it caught it.

No Astro grammar. At the revision the issue pins (213f6e69, still HEAD), tree-sitter-astro lexes the whole frontmatter as one opaque external token (frontmatter_js_block) and ships no tags.scm — only highlights and injections — so it yields zero definitions through a tags-driven extractor. tree-sitter-astro-next is identical in design with no adoption.

3. The blind spots, disclosed

In README.md, docs/COMMANDS.md and docs/ARCHITECTURE.md#astro-extraction:

• the template half is not read at all — a <script> body, an { expression } interpolation or a client:* directive is invisible, so a call made only from the template produces no edge;
• an .astro file reports lang="ts";
• most recovered callers are <file-scope> (t="modscope"), because frontmatter is module-level code;
• a --- inside a template literal or comment in the frontmatter ends the block early — the scan is lexical, and a refused file contributes no symbols rather than a guess;
• .vue, .svelte and .mdx remain unindexed as code. The included-range primitive is what each would reuse.

The gate

test/astrocheck.sh was written red against the stock 0.6.2 binary (no .astro row, every fixture file unindexed, arm 1 asserts first, rc=1 — read, not inferred, and recorded in test/gateexitcheck.sh). Seven arms: frontmatter definitions and kinds · the template is not parsed · fenceless/unterminated/CRLF shapes · the cross-file frontmatter→.ts edge on absolute line numbers · the decoy wins nothing · the included range does not leak to the next file a worker draws · cold/warm determinism · well-formed XML · relative vs absolute root · a mutation drops exactly its own edge.

Two arms are worth singling out:

• Line numbers are asserted, not just symbol names. tree-sitter takes row/column from TSRange::start_point; a range carrying {0,0} still yields correct byte spans, so --expand would look right while every p="file:line" lied by the fence offset.
• The reset is measured on .ts files, not .astro ones. ts_parser_set_included_ranges is lexer state that ts_parser_reset does not clear, and a TSParser is reused per worker — a missed reset truncates some later file in another language, nondeterministically by work-stealing order. The arm interleaves 40 .astro files with 40 .ts files whose marker sits at the end.

Fallout handled

test/blindspotcheck.sh and test/estchargecheck.sh both built their "a language no grammar reads" corpus out of .astro files — #66's own repro. Both now use .vue. estchargecheck had anticipated this in a comment ("if .astro ever became indexable … the two corpora would be identical and the comparison would prove nothing while staying green") and its presence guard fired correctly; this is the update it asked for.

kParserVer 119 → 120 with kIngestParserVerMirror in the same commit; test/qschemetrip.hash re-pinned with a dated RE-PIN LOG entry; test/printf_parity.manifest re-pinned, moved={help help_all} only. Both version numbers want re-deriving on the tree this merges onto — in-flight language lanes claim versions too.

Also confirmed

#60 is fixed on main, which is what makes this small: a frontmatter top-level call mints a real --callers edge. I could not reproduce @snrmwg's 3 unexplained API-route misses — every route spelling, path alias and workspace import I tried resolves on current main, and I believe #60 took them. Said in the issue rather than filed speculatively.

---

Verification on this branch: full gate suite gates=663 pass=660 skip=3 fail=0 (formatgatecheck skipped locally — no clang-format 22 here, so CI is the first real check on formatting); ASan+UBSan clean over test/astrofix, onwidget/astrowind and the 1585-file withastro/astro tree; --quality-delta gating=0 with no findings on the new code; determinism and xmllint clean.

🤖 Generated with Claude Code

https://claude.ai/code/session_015iWzVjDQ4jW6tN34bNMmDo

Summary by CodeRabbit

• New Features

  • Added support for indexing Astro files through their TypeScript frontmatter.
  • Astro imports and call sites now resolve consistently with TypeScript services.
  • Template-only content is excluded from indexing.

• Documentation

  • Updated language support guidance to describe Astro frontmatter and TypeScript file extensions.
  • Updated architecture, command, evaluation, and presentation materials.

• Tests

  • Added coverage for Astro frontmatter, templates, malformed files, caching, line endings, and import resolution.
  • Updated unsupported-file scenarios and increased the documented gate count to 648.

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Walkthrough

Changes

Astro support

Layer / File(s)	Summary
Frontmatter detection and parsing src/ingest_sidecap.h, src/ingest_crawl.h, src/ingest_parsepool.h, src/ingest_astquery.h	.astro files now parse only valid --- frontmatter as TypeScript. Template content is excluded, and parser range state is cleared after each file.
Language, resolution, and cache integration src/lintrules.h, src/resolve.h, src/ingest_cache.h, src/quality.h	Astro is classified as TypeScript, imports use TypeScript resolution, and the parser version increases from 119 to 120.
Astro fixtures and validation gates test/astrocheck.sh, test/astrofix/*, test/blindspotcheck.sh, test/estchargecheck.sh, test/gateexitcheck.sh, test/qschemetripcheck.sh, test/regression.sh	Tests cover extraction, excluded template symbols, call edges, invalid fences, CRLF input, parser reuse, cache determinism, XML output, and gate registration.
Documentation and catalog updates README.md, docs/ARCHITECTURE.md, docs/COMMANDS.md, docs/EVALS.md, present/deck5_ripwire_build.js, src/cli.h	Documentation and help text describe Astro frontmatter support. Gate-script references change from 647 to 648.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Feature · Severity of issue fixed: Medium

Suggested reviewers: joyful-ii-v-i

Merge Risk: 🟡 Moderate · up to 8cffe

Malformed Astro frontmatter can silently disappear from analysis, while two intended regression checks leave important behavior unprotected. Resolve these concerns before merging.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 61.11% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 18 functions across 18 files. (9 skipped:…	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: Astro files use TypeScript parsing for frontmatter through one included range.
Linked Issues check	✅ Passed	Issue #67 requests Astro support for TypeScript frontmatter and cross-file resolution to .ts services. The pull request maps .astro to Lang::TypeScript, extracts one --- frontmatter range, app…
Out of Scope Changes check	✅ Passed	The changed source files implement the frontmatter-only Astro scope from issue #67. The documentation, parser-version and schema artifacts, gate registration, and Astro fixtures support or verify that…

Full details: Docstring Coverage

Explanation

Docstring coverage is 61.11% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 18 functions across 18 files. (9 skipped: 9 unsupported.)

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Actionable comments posted: 4

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Inline comments:
In `@docs/COMMANDS.md`:
- Line 19: Update the README language-extension list near the TypeScript entry
to include .mts and .cts, keeping it consistent with docs/COMMANDS.md and
src/cli.h; alternatively, explicitly label the README list as non-exhaustive.

In `@src/ingest_sidecap.h`:
- Line 1276: The unterminated-fence path currently returns the same false status
as a genuine template-only file, causing frontmatter to be silently skipped.
Introduce a distinct unterminated status at the fence parser, handle it at every
extraction entry point by emitting DISCLOSE with the relevant reason, and retain
silent skipping only for the real template-only result.

In `@test/astrocheck.sh`:
- Around line 56-59: Add an assertion in the CRLF validation around the existing
astroTwice call collection to require a call record for astroTwice with p equal
to crlf.astro:3, while preserving the existing resolution assertion.
- Line 94: Update the reset fixtures generated by the test script so their
.astro files are larger than the generated m*.ts files, ensuring the cold parse
pool’s descending-size work order exercises an Astro-to-TypeScript transition.
Use template-only padding in the fixture content and preserve the existing reset
assertion.

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📒 Files selected for processing (27)

• README.md
• docs/ARCHITECTURE.md
• docs/COMMANDS.md
• docs/EVALS.md
• present/deck5_ripwire_build.js
• src/cli.h
• src/ingest_astquery.h
• src/ingest_cache.h
• src/ingest_crawl.h
• src/ingest_parsepool.h
• src/ingest_sidecap.h
• src/lintrules.h
• src/quality.h
• src/resolve.h
• test/astrocheck.sh
• test/astrofix/crlf.astro
• test/astrofix/decoy/svc.ts
• test/astrofix/leak.astro
• test/astrofix/page.astro
• test/astrofix/svc.ts
• test/astrofix/templateonly.astro
• test/astrofix/unterminated.astro
• test/blindspotcheck.sh
• test/estchargecheck.sh
• test/gateexitcheck.sh
• test/qschemetripcheck.sh
• test/regression.sh

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[sclyde]

Thanks — all four were real, and the first one was the good kind of catch.

The reset arm was vacuous. You were right that the work order decides this. ingest_parsepool.h sorts parseOrder longest-file-first (fileByteSize[a] > fileByteSize[b]), and my .ts files were ~1.5 KB against the .astro files' ~35 B — so every .ts was drawn before the first .astro and no worker ever performed the transition the arm exists to test. I checked rather than assumed: with the range reset deleted, the old fixture still reported 40/40 pass. It was pinning nothing.

Each .astro is now padded in its template, which keeps the included range tiny while the file is large, so it sorts ahead of every .ts. The arm also carries an explicit premise guard that fails loudly if that size relationship ever inverts, because the failure mode here is silence rather than a wrong answer. With the reset deleted it now loses all 40 markers; with it restored, 40/40.

The unterminated fence was a silent zero. Also right, and worse than it looked: the gate had asserted the silent behaviour, so the gap was pinned rather than caught. astroFrontmatterRange was returning one false for two different answers — a template-only .astro, which is ordinary and owes no disclosure, and a file whose frontmatter we can see the start of and cannot extract. It is a tri-state now (AstroFrontmatter::{Ok, None, Unterminated}), and Unterminated rides the existing ExtractShortfall channel into --skipped:

<skipped … extract_partial="1"><f p="unterminated.astro" why="extract-partial" bytes="53" ext=".astro"/></skipped>

I used ExtractShortfall rather than a new why= class deliberately: the file is indexed and its facts are partial, which is exactly what that channel already means, and nest-refused would have mislabelled it. The gate asserts both halves — the unterminated file is disclosed, and page/leak/crlf/templateonly are not, since a disclosure that fires on ordinary input means nothing.

CRLF line — fixed, it pins crlf.astro:3 now. That arm was weaker than the equivalent plain-.astro one for no reason, and CRLF is precisely where a row miscount would show up.

README extension list — fixed; the TypeScript row now lists every extension that Lang owns, .astro included.

No kParserVer bump: 120 already covers this extraction and has not shipped.

Verification on the new commit: full local suite green, ASan clean over test/astrofix (including the new disclosure path), onwidget/astrowind and the 1585-file withastro/astro tree, and --quality-delta gating=0. The previous commit's CI was green across the full matrix (34 pass / 2 schedule-only skips).

One note for whoever reviews next: test/g1freshcheck.sh caught me shipping a stale asan/ binary mid-round — I had built it before these edits — and cachefuzzcheck then failed comparing two binaries built from different sources. Rebuilt; both pass. The gate did its job.

[joyful-ii-V-I]

Thank you, @sclyde, and sorry this sat for two days. This is a careful PR. The STEP 0 measurement came before any code, the included-range reset has a guard on every exit path, and you found and fixed the vacuous reset arm yourself. That made it a pleasure to review. I rebuilt the branch merged onto our current integration train and checked it against fixtures I wrote myself, not only the gate's.

What I verified (on 8a5e205a merged onto integration/train-19, f84aceae)

1. Frontmatter extraction and cross-file edges. An .astro page that imports from ../lib/svc (extensionless .ts), ../lib/util.js and ../components/Card.astro resolves all three in --deps. --callers=fetchPosts lists localHelper at index.astro:7, which is the correct absolute line under a comment line and two imports. new Api() / api.get() and a component's slugify(title) land on <file-scope>, as the docs say they will.
2. Line numbers. They are correct inside the frontmatter, and a CRLF file reports crlf.astro:4.
3. No frontmatter, and template <script>. A template-only file, and a <script> block in the template of a page that does have frontmatter, both add no symbols and no edges (--callers=onlyFromScript count 0). Neither is disclosed per file, which matches the documented blind spot.
4. The tri-state. An unterminated fence shows up as <f why="extract-partial"> under --skipped, and the ordinary files do not. A --- inside a template literal ends the block early, and the file is flagged as degraded-parse.
5. The gate goes red when the feature is removed. I made four mutants and astrocheck failed on each: the range reset removed (40/40 .ts markers lost), start_point set to {0,0} (the line arm fails), Unterminated folded into None (the disclosure arm fails), and the range never applied (the frontmatter arm fails).
6. Cost. On a 2,100-file .astro corpus, ingest CPU time matches the same frontmatter saved as plain .ts files (0.39 s vs 0.45 s). On ripwire's own tree it is unchanged (−0.5% CPU, inside the noise).
7. --quality-delta gates 0 on both your range and the merged range. All 228 gates that name a file you changed pass on the merged tree, including deplangscheck, blindspotcheck, estchargecheck, gatecountcheck, printffmtparitycheck, docscommandscheck and formatgatecheck (clang-format 22).

Asks

• must: a CHANGELOG entry under ## [Unreleased]. The PR has none. Two or three sentences are enough: .astro frontmatter on the TypeScript grammar, the template not read, lang="ts", and kParserVer 121 → 122.
• must: the version and pin rebase below. It is our trains' doing, not yours.
• nice: a leading blank line before the opening ---. \n---\n…\n--- is currently read as template-only, with nothing disclosed. If Astro accepts leading whitespace before the fence (please check; I have not confirmed it), then either skip it or add one sentence to the blind-spot list. Either way, pin it with an arm.
• nice: the "ends the block early" wording. docs/ARCHITECTURE.md says an early --- "contributes no symbols rather than a guess". In fact the symbols before the stray fence are kept, the rest are lost, and the file is flagged degraded-parse. A half-sentence would make that accurate.

Version and rebase steps. When train 19 (#332) merges, main will be at kParserVer 121 / kCacheVersion 25 (#150 took 120 and moved the cache version to 25, and #310 took 121). So this PR becomes kParserVer 122, kCacheVersion 25. Your change adds no record-layout change (the new ExtractShortfall reason is not serialized), so the cache version must not move. The merge conflicts in six files:

1. src/ingest_cache.h, src/quality.h, test/qschemetrip.hash, test/qschemetripcheck.sh, test/printf_parity.manifest and test/regression.sh: take main's side of each file.
2. src/ingest_cache.h: set kParserVer = 122 and put a // 122 = … (#320/#67, .astro frontmatter …) … No record layout change: kCacheVersion stays 25 (NOT 24) entry above #310's 121 entry.
3. src/quality.h: set kIngestParserVerMirror = 122 with a one-line note, and leave kIngestCacheVersionMirror = 25.
4. test/qschemetripcheck.sh: add your RE-PIN LOG entry as "kParserVer 121 -> 122 … kCacheVersion stays 25". Then run UPDATE_GOLDEN=1 bash test/qschemetripcheck.sh build/ripwire. The pin must come out as 98afcd66a22ccaaa58bb671b517c58484ba382eb0f6755dd7f526c2123ebfc64. Any other hash means one of the two constants is wrong.
5. test/printf_parity.manifest: run UPDATE_GOLDEN=1 bash test/printffmtparitycheck.sh build/ripwire. Only help → 3a1ef339…2512b086 and help_all → bb1c9308…db5281e752 should move. Keep main's impact and clones.
6. test/regression.sh: keep main's absorb loop and add astrocheck in sorted order. Then python3 docs/gatecount_build.py rewrites the count (649 with train 19) in README, docs/EVALS.md and the deck.
7. docs/ARCHITECTURE.md: change "landed at revision 120" to 122.
8. The trap: don't take "theirs" (this branch) for both ingest_cache.h and quality.h. That gives 120/24. The mirror static_assert still passes and the build stays green, but it silently reverts #150's cache bump. If the pin in step 4 doesn't match, that is the sign.

With those steps applied, the build has 0 warnings, astrocheck, qschemetripcheck, printffmtparitycheck and qextractionkeycheck pass, and --quality-delta=integration/train-19..HEAD gates 0.

How it lands. Unless you'd rather do it yourself, we'll merge your branch as it stands into the next integration train after train 19 and apply steps 1–8 in the merge commit. Your commits stay yours. If you add the CHANGELOG entry as a new commit on the branch, we'll carry it the same way. If you prefer to push the rebase, rebase onto main once train 19 has merged and use the steps above. 122 is yours either way.

Thanks again. The included-range primitive is a clean base for .vue and .svelte later.

[sclyde]

Thanks @joyful-ii-V-I, that was a thorough review, and the four mutants are a better test of the gate than anything I did.

Pushed 03d17b6d with the CHANGELOG entry and both nice-to-haves:

• CHANGELOG: an [Unreleased] entry, written as kParserVer 121 → 122 / kCacheVersion unchanged. That's what lands after train 19, though the branch itself still carries 120. main already has an [Unreleased] heading, so this hunk will conflict in the merge.
• A blank line before the opening fence: Astro does accept it. Checked with @astrojs/compiler 4.0.0, both parse() and transform(), for blank lines and whitespace-only lines, LF and CRLF. The scan now skips those lines and carries the skipped rows into TSRange::start_point. New arm (6d) pins an LF and a CRLF file by absolute line and checks that neither shows up under --skipped. It fails on 8a5e205a.
• The early---- wording: docs/ARCHITECTURE.md now says the symbols before the stray fence are kept, the rest are lost, and the file is flagged degraded-parse.

The same compiler check turned up two more shapes Astro accepts that this still doesn't read. I left them out to keep this minimal, but they could be follow-ups:

• an indented --- on either fence. An indented closing fence is disclosed as extract-partial; an indented opening fence reads as template-only.
• text or an HTML comment before the opening fence, which reads as template-only.

Please go ahead with the version rebase in the train merge commit as you offered, following your steps 1–8. Thanks for writing out the pin hash and the 120/24 trap.

🤖 Generated with Claude Code

[joyful-ii-V-I]

Thanks, @sclyde. This follow-up closes everything we asked for, and you added more than we asked. We said a leading blank line was worth checking. You checked it against Astro's own compiler, fixed it, and pinned it with a new arm, written red against the old head. I re-reviewed 03d17b6d on its own and merged onto the current integration train.

What I verified

1. Leading blank lines. A file that starts with blank or whitespace-only lines before --- (LF, CRLF, and a UTF-8 BOM followed by a \t line) now reports its frontmatter call on the correct absolute line: leadblank.astro:4 and bom.astro:5. A file of only blank lines, and a file whose first real line is template markup, stay silent. An unterminated fence after blank lines is still disclosed as extract-partial.
2. The new arm catches the bug. I made two mutants and astrocheck failed on each: the blank-line skip removed, and start_point left at row 1. It passes when both are restored.
3. The earlier checks still hold. --callers=fetchPosts lists localHelper @ index.astro:7 and crlf.astro:4, and --deps resolves each page's imports into the .ts service and the .astro component.
4. Checks. --quality-delta gates 0 on your range, on the merge onto main, and on the merge onto the train. The build has 0 warnings. astrocheck, qschemetripcheck, printffmtparitycheck, gatecountcheck, blindspotcheck, deplangscheck and formatgatecheck (clang-format 22) all pass on the merged tree, along with the other gates that name a file you changed.
5. CHANGELOG and ARCHITECTURE. Both are right: the entry is under ## [Unreleased], and the stray---- wording now matches what the code does.

How it lands. You don't need to push anything more. We'll merge your branch as it stands into the next integration train, with your commits kept as yours. In the merge commit we'll do the version renumbering from last time: kParserVer 122, kCacheVersion stays 25, the qschemetrip pin re-derived, and ARCHITECTURE's "revision 120" changed to 122. We'll also put your [Unreleased] entry above the 0.6.3 release that shipped since your branch. I'll link the train PR here when it opens.

Thank you again for a careful, well-tested PR.

[joyful-ii-V-I]

Your branch is now in integration train 20: #336. It's merged as-is, with your commits kept, and the version renumbering (kParserVer 122, kCacheVersion 25) is done in the merge commit. Once CI and review pass, it ships in 0.6.4. Thank you, @sclyde!