websem: admit ordered declared font families - #127
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WalkthroughThe textlayout oracle advances to v5. Font selection now accepts ordered named and generic families, applies Unicode BMP simple-fold matching, and reports typed refusal reasons. SVG text, tests, fixture baking, manifests, and documentation now use the family-list contract. ChangesText family selection
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟡 Moderate · up to The current manifest formatting breaks the textlayout architecture test, so the PR should not merge until the dependency declaration or scanner is corrected. Sequence Diagram(s)sequenceDiagram
participant SVG
participant Websem
participant Textlayout
participant Environment
SVG->>Websem: computed ordered font-family list
Websem->>Textlayout: Style with FontFamily candidates
Textlayout->>Environment: match_family(candidate name)
Environment-->>Textlayout: unique match, no match, or ambiguity
Textlayout-->>Websem: resolved layout or typed refusal
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 72.06% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 68 functions across 19 files. (17 skipped: 16 unsupported, 1 too large.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Inline comments:
In `@crates/textlayout/Cargo.toml`:
- Around line 20-22: Update the regex-syntax dependency declaration in
Cargo.toml so its features list, including "unicode-case", remains on a single
line; preserve the pinned version and disabled default features to keep
architecture.rs dependency scanning and the existing configuration correct.
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⛔ Files ignored due to path filters (6)
Cargo.lockis excluded by!**/*.lockfixtures/web-first/text/chromium/svg-text-family-list-selection.pngis excluded by!**/*.pngfixtures/web-first/text/svg-text-family-list-selection.svgis excluded by!**/*.svgfixtures/web-first/unsupported/svg-text-family-ambiguous.svgis excluded by!**/*.svgfixtures/web-first/unsupported/svg-text-family-generic.svgis excluded by!**/*.svgfixtures/web-first/unsupported/svg-text-family-missing-glyph-fallback.svgis excluded by!**/*.svg
📒 Files selected for processing (36)
AGENTS.mdcrates/n0/src/text_join_spike.rscrates/n0_cli/README.mdcrates/n0_cli/src/main.rscrates/textlayout/Cargo.tomlcrates/textlayout/src/artifact.rscrates/textlayout/src/environment.rscrates/textlayout/src/lib.rscrates/textlayout/src/resolve.rscrates/textlayout/tests/architecture.rscrates/textlayout/tests/oracle_v5.rscrates/textlayout/tests/oracle_v5_family_selection.rscrates/websem/src/svg.rscrates/websem/src/svg_text.rscrates/websem/tests/best_effort.rscrates/websem/tests/groups_contract.rscrates/websem/tests/support/fixture_fonts.rscrates/websem/tests/svg_text.rscrates/websem/tests/svg_text_geometry.rscrates/websem/tests/unsupported_corpus.rscrates/websem/tests/use_contract.rsdocs/wg/consolidation/index.mddocs/wg/consolidation/svg-engine-of-record.mddocs/wg/consolidation/text-oracle.mddocs/wg/consolidation/web-checklist.mddocs/wg/feat-paragraph/text-layout.mdfixtures/web-first/README.mdfixtures/web-first/STATUS.mdfixtures/web-first/fonts/README.mdfixtures/web-first/justfilefixtures/web-first/text/README.mdfixtures/web-first/text/bake_chromium.tsfixtures/web-first/text/cases.jsonfixtures/web-first/text/geometry/add_case.pyfixtures/web-first/text/oracle-bake.jsonfixtures/web-first/unsupported/README.md
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Verdict
T5a is ADMIT/SPLIT, with no checklist closure.
websemnow preserves the complete computedfont-familylist from Stylo,including the named/generic distinction, and
textlayout-v5selects the firstunique host-declared named resource in request order. Missing names fall
through. Reached generics, same-name ambiguity, exhausted requests, synthesis,
descriptor matching, and missing-glyph fallback remain explicit boundaries.
The complete CSS and SVG presentation-attribute
font-familygrammars remainopen, so this PR ticks no checklist row.
Measured crux
Chromium 149.0.7827.55 establishes the bounded selection policy:
falls through.
Å/å, sigma/final-sigma, Kelvin/k, long-s/s, and the three Unicode 17 BMP
additions all reproduced.
Maße/MASSE, composed/decomposed names, and supplementary Deseret case donot match: there is no expansion, normalization, or supplementary folding.
"serif"is a name; unquotedserifis a generic and intercepts alater named family.
@font-facerules are stylesheet-source-ordersensitive. The host manifest carries no such descriptor/order contract, so
duplicate matches refuse rather than inheriting vector order.
delta 238. The new ten-branch family-list cell is pixel-exact to its
independent all-Ahem Chromium construction.
Every probe used
fixtures/web-first/probe_harness.tsand the sharedhash-pinned capture module. The committed cell also rendered through the
actual strict and best-effort
n0command; both decoded images equal theChromium oracle with zero differing channels.
Contract and evidence
textlayoutadvances to v5.Stylecarries orderedFontFamily::NamedandFontFamily::Genericcandidates; the immutable artifact retains the exactselected content key and face index.
three directly measured Unicode 17 BMP additions. No font discovery or I/O
enters the producer.
MissingGlyphand never retries the original family list.
those paths cannot select different faces. No text or font fact crosses
rframe.exercises presentation, inline style, stylesheet, inheritance,
unset,missing-name fallthrough, ASCII case, quoted syntax, CSS escape, and an
unreached generic.
same-family resources, and missing-glyph non-fallback.
exact text cells, eight exact-number real-font geometry witnesses, and 220
named refusals. The filter estate remains 453 cells.
No existing oracle was overwritten. The text manifest gained exactly one
sorted record; all eleven prior records and hashes stayed unchanged.
Gate sensitivity
I deliberately truncated the computed family list to its first candidate.
All 1,051 primitive cells stayed green, then the new exact text cell failed
loudly on its leading
Missingname. Restoring the complete list returnedevery primitive, text, geometry, and refusal gate to green.
Workflow review
This environment exposes no Workflow runner for
.agents/workflows/verify-rung.js. I therefore reproduced its two independentroles by hand:
font-familyrows; confirmedzero tick flips, audited each prose claim and count, kept probe-only facts
marked measured-not-celled, and verified no matcher bypasses Stylo and no
font fact enters
rframe. This pass found stale v4 wording in three existingtext patrol diagnostics; they were corrected to v5 and the generated status
record was refreshed.
strict/best CLI comparison, fixture closure, old-oracle preservation,
manifest hashes/order, stable refusal paths, status freshness, and the
deliberate sensitivity failure/restoration.
Verification
just bakejust text-bakejust text-geometry-bakejust gatejust statuscargo test --locked -p textlayout -p websem -p n0 -p n0_clicargo fmt --all -- --checkcargo clippy --no-depsgit diff --checkNo conformance score was produced or inspected. FLIP and its record, rule, and
baseline are unchanged.
Refs #43.
Refs #69.