websem: audit SVG line and gradient coordinates - #117
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Add Chromium-gated x1/y1/x2/y2 coverage, quarantine raw-number and zero-area paint gaps, and reopen opacity for the discovered line-coverage alias.
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WalkthroughThe change admits measured ChangesSVG coordinate and opacity contracts
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: 🟡 Moderate · up to The PR expands SVG coordinate support but currently has bounded correctness issues: some valid degenerate gradients may be refused, overflowed coordinates may silently use defaults, and product resolution logic is placed in a disallowed source path. These should be fixed or explicitly accepted before merge. Sequence Diagram(s)sequenceDiagram
participant SVGDocument
participant resolve
participant gradient_length
participant ResolvedPaintServer
SVGDocument->>resolve: resolve linear-gradient
resolve->>gradient_length: decode x1/y1/x2/y2
gradient_length-->>resolve: resolved coordinate or named error
resolve->>ResolvedPaintServer: create paint result
ResolvedPaintServer-->>SVGDocument: paint or refusal
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 73.08% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 26 functions across 5 files. (9 skipped: 8 unsupported, 1 too large.)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Actionable comments posted: 3
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Inline comments:
In `@crates/websem/src/svg_paint_server.rs`:
- Around line 373-387: Remove the product paint-resolution logic from the
zero-area handling in the gradient resolver, including the GradientUnits match
and ResolvedPaintServer results. Move this behavior to the approved
product-resolver location, or restrict this path to the permitted
contract-record changes only.
- Around line 373-387: The zero-area destination check currently rejects
user-space gradients before degenerate multi-stop ramps can resolve to
source-neutral solids. In the gradient resolution flow, including resolve_linear
and resolve_radial, perform degenerate endpoint or non-positive-radius
classification first, and apply the destination_box zero-area refusal only when
a live gradient still requires the inverse unit-box mapping; preserve
ObjectBoundingBox’s Nothing result and existing solid-resolution behavior.
- Around line 721-726: Update the numeric handling in gradient_length so
exponent-form tokens such as 1e999 and -1e999, which fail both f32 and f64
parsing but pass the existing unit validation, return the admitted Web
used-value range error. Ensure resolve_linear does not receive Ok(None) for
these overflowed values and apply the existing error message consistently.
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ℹ️ Review info
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Run ID: 5e5682f0-2afe-4b67-a18c-a482fbb6c921
⛔ Files ignored due to path filters (22)
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📒 Files selected for processing (14)
crates/n0_cli/README.mdcrates/websem/src/svg.rscrates/websem/src/svg_paint_server.rscrates/websem/tests/gradients_contract.rscrates/websem/tests/opacity_contract.rscrates/websem/tests/strokes_contract.rscrates/websem/tests/unsupported_corpus.rsdocs/wg/consolidation/svg-engine-of-record.mddocs/wg/consolidation/web-checklist.mdfixtures/web-first/README.mdfixtures/web-first/STATUS.mdfixtures/web-first/oracle-bake.jsonfixtures/web-first/primitives.jsonfixtures/web-first/unsupported/README.md
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Measure the object-box/user-space split, gate constant and degenerate ramps on zero-area line geometry, and pin overflow exponents to the existing range refusal.
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Verdict
SPLIT the shared SVG
x1/y1/x2/y2attribute rung. Six Chromium-gated cells admit the measured subset on<line>and<linearGradient>, but all four rows remain open: valid long-decimal values and CSS comments still need source provenance/tokenization that the raw attribute routes cannot recover, and neither gap has an independent checklist row.The required instance audit also found a pre-existing silent wrong pixel in partial element opacity on anti-aliased lines. That class now refuses by stable name, and both
opacitychecklist spellings reopen.What landed
viewBoxunits, transforms, stroke geometry, and same-document<use>.px, transformed gradient stroke, and independent coordinate inheritance through template chains.<line>through attribute, inline/stylesheet CSS, inherited-container, and<use>routes before it can alias stroke opacity.Measured boundary
Chromium 149.0.7827.55 and both actual n0 admissions agree at zero differing pixels on all eight committed cells. Every source/control candidate was also rendered through both n0 admissions; a clean process exit was not treated as pixel proof.
Two valid source-number classes reproduce on every coordinate and both consumers:
8388608.5selects Chromium's lower adjacent binary32 value while the former direct parse selected the higher. Higher controls differ by 187–202 line pixels at maximum channel delta 170–185, and 1,840–2,008 gradient pixels at delta 6–7.57384.267578125007also selects Chromium's lower neighbour. Higher controls differ by 111–132 line pixels at delta 100–103 and 1,725–2,273 gradient pixels at delta 2–9. Its percentage spelling differs by 189–194 line pixels at delta 211 and 3,584 gradient pixels at delta 20–21.Every source was twice deterministic and exact to its lower control. On a ten-unit axis,
.5%separately value-measures Chromium's multiply-before-divide result; adjacent arithmetic controls are pixel-identical at this probe size, so no pixel claim is made for that sub-probe. These facts are recorded as measured, not celled.Exponent overflow does not silently default. Chromium maps
1e999/-1e999through its finite SVG-number extremes and fixed used-value clamps; under a discriminating transform each is exact to its clamp control and differs from default by 3,136 pixels at delta 202 and 1,568 pixels at delta 89. Current n0 already refused both by the exact used-range name; executable contracts now pin that behavior.The consumer split is explicit: case-insensitive
pxis admitted on gradients but remains a line-unit refusal. Wider units, CSS math,var(), CSS-wide values, comments, finite percentage overflow, and fixed used-range values all leave through focused stable names in strict and best-effort paths.The zero-area matrix found a unit-dependent precedence. A live user-space ramp differs from nothing by 384 pixels at delta 209 and remains a named contract refusal. User-space linear
pad/repeat, a concentric non-positive radial, and a one-stop ramp are exact to source-neutral controls. Object-box live, degenerate, and one-stop ramps are exact nothing; each tempting solid differs by 384 pixels at delta 211–226. A zero-radius off-center focal radial is measured nothing, while positive focal radius remains a live focal result under the existing focal-radial refusal.The opacity witness shows why the reopen is necessary. Chromium element opacity differs from stroke opacity by 62 pixels at maximum channel delta 11; the former n0 output matched the wrong control. A mapped
<use>instance reproduced 113–124 wrong pixels at delta 1–2. The refusal is deliberately line-specific and does not absorb the separately tracked fill-only or pattern-source boundaries.Gate sensitivity
svg-gradient-zero-area-degenerate-solidfail at its first stroke.svg-gradient-zero-area-unit-splitfail by 864 pixels at maximum delta 226.Restoring all three semantics returned the complete 1,043-cell gate to green. No tolerance was added.
Checklist and counts
x1,y1,x2,y2: remain open.opacityproperty and presentation attribute:[x]→[ ].Independent rung review
No Workflow runner is exposed in this environment, so
.agents/workflows/verify-rung.jscould not be invoked through itsscriptPath. I reproduced its two independent roles by hand from a self-contained ignored brief:The skeptical pass corrected a documentation overclaim about line
px, added a dedicated line-pxcontract/refusal witness, added the stylesheet opacity route, and clarified probe-only claims. PR review then found that the first zero-area guard preempted valid user-space degenerate solids. The follow-up Chromium matrix established the full object-box/user-space precedence, found the older object-box one-stop wrong pixel, added two external-oracle cells, and pinned overflow exponents to the already-correct range refusal. The requested product-location move did not apply:websemis the engine's semantic compiler, not product/editor code.Verification
cargo test -p websem -p n0_cli -p rframe -p n0cargo fmt --allandcargo fmt --all -- --checkcargo clippy --no-depscargo clippy --no-deps --workspace --exclude grida-canvas-wasm -- -D warningsjust bake(Chromium 149.0.7827.55; 1,043 oracles)just gatejust statuspnpm fmt:checkpnpm exec oxlint --deny-warningspnpm --filter www types:checkpnpm --filter www buildpnpm --filter @grida/reftest typecheckpnpm --filter @grida/reftest buildpnpm --filter @grida/reftest test(51 passed, 1 skipped)git diff --check