fix(parser): reject non-finite numeric literals at the parse boundary - #3330
fix(parser): reject non-finite numeric literals at the parse boundary#3330BIMvoice wants to merge 7 commits into
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A STEP real whose exponent overflows the IEEE-754 double range (`1.0E400`) parses to `Infinity`, and `isNaN(Infinity)` is `false`, so the numeric guards in `entity-extractor` and `attribute-helpers` admitted it. The value then entered the property table and flowed to every writer, where `JSON.stringify(Infinity)` is `null` — the exported file lost the value with no diagnostic anywhere along the way. Every guard now tests `Number.isFinite`: - `parseAttributeValue`'s number branch falls through to the existing raw-token return, so the literal is preserved verbatim as `"1.0E400"` rather than dropped or clamped. Nothing the file contained is lost, and the `typeof x === 'number'` guards downstream now decline to use it instead of consuming an infinity. - An express-id reference with enough digits to overflow (`parseInt` of 400 digits is `Infinity`) resolves to `null`, and a record whose own id overflows is refused rather than keyed by `Infinity`. - `getNumber` and `getReference` return `undefined`, matching their `number | undefined` contracts. `iso8601-duration` and `entity-scanner` already guarded with `Number.isFinite`; `source-bytes`'s `clampRange` treats infinities deliberately and is unchanged.
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Included review availability: Your plan provides up to 2 included reviews per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe parser now rejects non-finite numeric values and unsafe EXPRESS IDs. Overflowing literals remain raw strings. Quantity, georeferencing, site, and material paths refuse invalid values instead of substituting zero. Tests cover parser and consumer behavior. ChangesNon-finite literal handling
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: 🟡 Moderate · up to The parser now preserves overflowing numeric literals and rejects overflowing entity IDs, but the worker path still accepts IDs that can be truncated by Uint32 storage and return the wrong entity reference. That bounded correctness risk should be fixed or explicitly accepted before merging. Sequence Diagram(s)sequenceDiagram
participant STEPParser
participant AttributeHelpers
participant NumericConsumers
participant GeoreferenceExtractor
STEPParser->>AttributeHelpers: parse identifier and numeric literal
AttributeHelpers-->>STEPParser: finite value, raw token, or undefined
STEPParser->>NumericConsumers: provide extracted attributes
NumericConsumers->>AttributeHelpers: validate numeric representability
NumericConsumers-->>STEPParser: retain value or refuse extraction
STEPParser->>GeoreferenceExtractor: provide map-conversion attributes
GeoreferenceExtractor->>AttributeHelpers: validate placement values
GeoreferenceExtractor-->>STEPParser: conversion, CRS-only result, or refusal
Suggested reviewers: Poem
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Title checkExplanation The title clearly and concisely describes the primary parser change: rejecting non-finite numeric literals at the parse boundary. It matches the main changeset despite not listing related downstream handling and express-ID safeguards. Full details: Docstring CoverageExplanation Docstring coverage is 63.64% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 33 functions across 14 files. (1 skipped: 1 unsupported.) Comment |
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Inline comments:
In `@packages/parser/src/attribute-helpers.ts`:
- Around line 21-28: Update the numeric branches of getNumber and getReference
to apply Number.isFinite before returning values, so direct NaN or Infinity
inputs return undefined. In packages/parser/src/attribute-helpers.ts lines 21-28
and 45-48, make the same finite-value guard in both affected sites.
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.changeset/parser-non-finite-numeric-literals.mdpackages/parser/src/attribute-helpers.tspackages/parser/src/entity-extractor.tspackages/parser/test/non-finite-numeric-literals.test.ts
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Viewer benchmark✅ No threshold regressions detected. 01_Snowdon_Towers_Sample_Structural(1).ifcBaseline recorded 2026-07-01T20:31:05.538Z on github-actions ubuntu-latest, viewer-benchmark-ci (headless Chrome, SwiftShader ANGLE), production build.
AC20-FZK-Haus.ifcBaseline recorded 2026-07-01T20:30:59.972Z on github-actions ubuntu-latest, viewer-benchmark-ci (headless Chrome, SwiftShader ANGLE), production build.
Refresh the baseline from a CI run: dispatch the Benchmark workflow with |
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Adversarial review. Everything below was run, in an isolated worktree at head What holds upThe RED reproduces, exactly as described. Reverting
" No token exists that yields Performance is neutral — measured, not assumed. Median of 5 full Microbench over 200k realistic tokens: Parser suite green on the branch: 81 files, 861 passed | 2 skipped. Finding 1 — two real consumers turn the preserved literal into a plausible
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Preserving an overflowing STEP real as its raw token is only honest where the
consumer's value type admits a string. Two consumers type the field `number`,
so the preserved string failed their `typeof x === 'number'` test and they fell
back to `0` — turning a detectably missing value into an undetectably wrong
one. Measured end-to-end through `parseLite`, the previous commit moved these
two rows the wrong way:
quantities old: value null new: value 0
georeferencing old: eastings null new: eastings 0
A null easting is visibly absent. An easting of 0 is a coordinate.
- `IfcElementQuantity` measures outside the double range are dropped with a
warning instead of reported as 0, matching what the sibling
`QuantityExtractor.extractQuantity` path already did for a non-numeric value.
- An `IfcMapConversion` whose Eastings/Northings/OrthogonalHeight is outside the
range is refused with a warning, leaving `mapConversion` and
`transformMatrix` absent rather than placing the model at a substituted
origin. The `IfcProjectedCRS` in the same file is still reported.
Both go through one shared `isOverflowingNumericLiteral` predicate, which
deliberately excludes NaN: a NaN token was already a raw string before
non-finite guarding, so it is an ordinary unparseable label rather than a
number that overflowed. A genuine 0.0 measure and a genuine 0 easting are
unaffected, and both directions are tested.
`getNumber` and `getReference` guarded only their string branch, so
`getNumber(Infinity)` returned `Infinity` and `getNumber(NaN)` returned `NaN` —
the changeset's claim that they "return undefined for non-finite input" was an
overclaim. Both branches are now guarded and the claim holds.
The express-id sweep entry was wrong about its own mechanism. `extractEntity`
returning null did not fix an overflowing id; it left a half-alive record —
`extractPropertiesOnDemand(store, Infinity)` still returned the pset while the
entity's own GlobalId and Name were unreadable. The overflow happens in the
digit accumulators, and all four were unguarded, so every overflowing id
collapsed onto the same Infinity and distinct records collided on one key
(`DISTINCT = 2 of 3`, reproduced). Guarded at each accumulator instead: both
`StepTokenizer` scans, the inline scan worker, and `readRefId` on the
byte-level relationship path. Re-measured: performance-neutral, 7.32 ms with
the guard vs 7.38 ms without (median of 25 runs over 1.81 MB).
`extractMapConversion` moves to `georef-map-conversion.ts` so
`georef-extractor.ts` stays under its recorded module-size budget rather than
raising it — the same split the transform side already uses.
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Adversarial review findings addressed in 07fb506. The PR body is rewritten; the short version: 1. This PR was making two paths worse. Confirmed the reproduction end-to-end through Preserving the literal as a string is only honest where the consumer's value type admits a string. Remedies, chosen on whether absence is expressible in the consumer's type:
Consumers now see a quantity missing from its set (finite siblings untouched), or "no usable georeference" — never a substituted number. Genuine The "nothing is silently dropped" justification was false on these two paths; it is corrected in the PR body and in the 2. 3. The express-id entry was wrong about its mechanism, and you were right that the branch was untested. Reproduced The half-alive record was worse than described: the surviving pset came from the byte-level Re-measured as you asked: 7.32 ms with the guard vs 7.38 ms without ( Tests. 886 passed | 2 skipped (861 before). Three mutation checks, each restored by inverse edit with an empty
Your call: |
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Second-round review at 1. Blocking: the IFC2x3
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…hs the fix armed Making `getNumber` answer `undefined` for an overflowing literal fixed the native `IfcMapConversion` path and armed every `?? 0` / `|| 0` downstream of it: while the answer was `Infinity` those fallbacks were unreachable, because `Infinity` is neither nullish nor falsy. The reported one is the IFC2x3 twin. `extractEPSetMapConversion` did `asNumber(values['Eastings']) ?? 0`, so a file that read back `eastings = Infinity` on main now reads back `eastings = 0`, with `hasGeoreference: true`, a transform matrix and no diagnostic — the exact failure this rework removed from the entity path, reintroduced on the property set path. It now refuses like its twin, keeps any `ePSet_ProjectedCRS`, and warns before the caller falls through to the legacy `IfcSite` fallback. Two more of the same shape were found by sweeping the fallbacks downstream of the changed helpers: an `IfcSite` whose `RefElevation` overflows was reported at the datum, and an `IfcMaterialLayer` whose `LayerThickness` overflows was reported as 0 thick and silently vanished from its set's total. The three optional `IfcMapConversion` components join the mandatory three in the refusal: `computeTransformMatrix` reads an absent `Scale` as `1.0` and an absent axis pair as no rotation, so dropping just the field substitutes the schema default for a value the file stated. The guard is shared and now covers a non-finite `number`, not only an overflowing token, so a value arriving as an actual `Infinity` cannot slip past it — `asNumber` short-circuited `getNumber` for exactly that case and no longer does. The ePSet reader and the material-layer reader move to their own modules; `georef-extractor.ts` was at its module-size budget and `material-extractor.ts` would have crossed the 400-line limit. `georef-extractor.ts` is now 383 lines, so its allowlist row is deleted and the digests re-pinned.
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This went Same subject as this PR from the other end — that one stops non-finite values being written, this one stops them being read at the parse boundary. Two halves of the same problem landing within minutes, so a textual collision was likely. Needs a rebase onto For what it's worth, the pairing looks deliberate and worth keeping distinct: rejecting |
The overflow guards added earlier in this PR fire only when an accumulated
id reaches Infinity, which takes ~309 digits. Doubles lose integer precision
at 2^53, so two distinct ids collide onto one value from ~16 digits:
parseInt('100000000000000001', 10) === parseInt('100000000000000002', 10)
Both pass Number.isFinite. That is the same "two distinct records collide on
one key and one silently serves the other's data" hazard the readRefId
comment already described, at a threshold a real file can reach.
Number.isSafeInteger is a strict superset for this purpose -- it still
rejects NaN, Infinity and non-integers -- so nothing the old guard caught is
let back in. Applied to the six express-id / reference paths only:
StepTokenizer's two scans, the inline scan worker, readRefId, extractEntity's
own id parse, parseAttributeValue's '#' branch, and getReference.
The value paths keep Number.isFinite: a STEP real legitimately exceeds 2^53
and losing precision there is inherent to doubles, not a collision between
two keys. getNumber and the parseFloat branch are unchanged.
Claude-Session: https://claude.ai/code/session_01QPHChk3Ve9N519A4kY7436
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Inline comments:
In `@packages/parser/src/scan-worker-inline.ts`:
- Around line 89-95: Update the worker ID storage in scan-worker-inline.ts to
use Float64Array for the worker ID arrays and idArr, preserving every
Number.isSafeInteger(expressId) value without Uint32 truncation. Also change the
related trim-size calculation from count * 4 to count * 8, while leaving the
existing safe-integer validation and result behavior intact.
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.changeset/parser-non-finite-numeric-literals.mdpackages/parser/src/attribute-helpers.tspackages/parser/src/columnar-parser-attributes.tspackages/parser/src/entity-extractor.tspackages/parser/src/scan-worker-inline.tspackages/parser/src/tokenizer.tspackages/parser/test/non-finite-numeric-literals.test.ts
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Sole conflict was ALLOWLIST_DIGESTS in scripts/check-module-size.mjs, pinned hashes only. Resolved by re-deriving every digest from the merged tree with 'node scripts/check-module-size.mjs --update', the documented regeneration path, rather than picking a side. Reported 7 lowered, 0 raised, 0 removed, 0 added -- no budget raise, so nothing is masked.
The merge commit's message says the digests were re-derived with 'check-module-size.mjs --update'. They were, but --update ran AFTER the conflict resolution was staged, so neither the rewritten allowlist nor the re-pinned ALLOWLIST_DIGESTS entered that commit. The tree CI received still carried the pre-merge pins, and 'Check TypeScript module size ratchet' failed on it while passing locally against the unstaged working tree. This commit adds what that one should have carried. Still 7 lowered, 0 raised, 0 removed, 0 added.
The guard added in this PR admits any safe integer, but the inline scan worker stored each id in a Uint32Array. 4294967297 (2^32 + 1) is a safe integer, so it passed the guard and then wrapped to 1 -- a distinct record silently serving entity #1's data. That is the same hazard the rest of this PR closes, one layer further down: the guard promised to reject ids it cannot represent, while this path quietly truncated them instead. `ids` and the receiving `idArr` are now Float64Array, which holds every safe integer exactly. The trim predicate moves from `count * 4` to `count * 8` for the wider element; it still covers the other three arrays, since "capacity > count" is the same test at either width. offsets/lengths/lines stay Uint32Array. Those are byte positions, bounded by file size rather than by the id space, and widening them is a separate question. The existing test helper read the transferred buffer as Uint32Array, which would reinterpret the doubles as garbage (2.1e-314), so it moves to Float64Array in the same commit. Reported by CodeRabbit; verified before fixing -- `new Uint32Array(1)` with 4294967297 written to it reads back 1.
2 participants
The defect
packages/parser/src/entity-extractor.tsguarded its number branch with!isNaN(num). A STEP real whose exponent overflows the IEEE-754 double range parses toInfinity, andisNaN(Infinity)isfalse— so it passed.Reproduced through the real parse path (
parseColumnar+extractPropertiesOnDemand, the API the writers use), before the fix:Raw attributes of
#7=IFCCARTESIANPOINT((1.0E400,-1.0E400,0.));came back as[Infinity, -Infinity, 0], andJSON.stringifyof exactly that array is:That is the corruption shape: the exported file loses the value, with no diagnostic anywhere along the way.
NaNdoes not reproduce —parseFloatreturnsNaNonly for tokens the old guard already rejected. Only the infinities slipped through.Behaviour chosen
Preserve the literal as its raw token, rather than rejecting the attribute or clamping.
parseAttributeValuealready ends withreturn value— the raw token — for every token it cannot represent as a number (enumerations, identifiers). TestingNumber.isFiniteinstead of!isNaNlets an overflowing literal fall through to that same branch, so1.0E400survives as the string"1.0E400".0at their own write boundary, which is a different decision — a writer must emit something; a reader need not.)Correction: preservation is not enough on its own
An earlier revision of this PR justified emitting no warning with "nothing is silently dropped". That was false on two paths, and this PR made them worse before fixing them. Preserving the literal as a string only helps a consumer whose value type admits a string — the property table's
PropertyValueunion does. Where the field is typednumber, the preserved string fails the consumer'stypeof x === 'number'test and it falls back to whatever default it has. Measured end-to-end throughparseLite:value nullvalue "1.0E400"value "1.0E400"value nullvalue 0⟵ worseeastings nulleastings 0⟵ worsemapConversionabsent + warning(
nullin the first column isJSON.stringifyrendering the in-memoryInfinity.)A null easting is detectably missing; an easting of
0is a plausible coordinate — it silently places the model at the projection origin, and nothing downstream can tell that apart from a model that really sits there. That is a harder defect to notice, not an easier one.Remedy chosen per path, on the principle absence must be expressible or the value must be refused:
CollectedQuantity.valueis typednumberand consumers do arithmetic on it, so absence cannot be expressed in the field. The quantity is dropped with a warning. This is not a new policy: the siblingQuantityExtractor.extractQuantityalready returnsnulland warns when slot 3 is not a number, and both walk the sameQuantitieslist, so they must agree.eastings/northings/orthogonalHeightare typednumberand feedtransformMatrix, the STEP writer and the viewer's placement editor. ButGeoreferenceInfo.mapConversionis optional and every consumer already reaches it asgeoref.mapConversion?.eastings, so the whole map conversion is refused with a warning. A caller now sees "this file has no usable georeference", which is true. TheIfcProjectedCRSin the same file is still reported.What a downstream consumer sees: an overflowing quantity is missing from its quantity set (its finite siblings are untouched); an overflowing map conversion yields
mapConversion: undefinedand notransformMatrix. Both emit oneconsole.warnnaming the entity and the offending literal, so neither is silent. A genuine0.0measure and a genuine0easting are unaffected — both directions are tested.material-resolver.tsproduced0before this PR and is unchanged, so it is out of scope here.Both paths share one
isOverflowingNumericLiteralpredicate, which deliberately excludesNaN: aNaNtoken was already a raw string before non-finite guarding, so it is an ordinary unparseable label, not a number that overflowed.No warning is emitted on the
parseAttributeValuepath itself: the literal really is right there in the output, and it is the hottest loop in the parser.Sibling sweep (
isNaN/parseFloat/parseInt/Numberacrosspackages/parser/src)entity-extractor.tsnumber branchentity-extractor.ts#refbranchparseInt('1'.repeat(400), 10)isInfinity, notNaN, so anisNaNguard passed it. Now resolves tonull.tokenizer.tsscanEntitiesFastexpress idextractEntity, which was wrong — see below.) The id is accumulated asexpressId*10+digit, which overflows itself; every overflowing id lands on the sameInfinity, so distinct records collide on one key. Reproduced: three records, two of them overflowing, gaveDISTINCT = 2 of 3. Now refused at the accumulator.tokenizer.tsreadExpressIdscanEntitiestwin.scan-worker-inline.tsexpress idcolumnar-parser-attributes.tsreadRefId-1sentinel.entity-extractor.tsown express idextractPropertiesOnDemand(store, Infinity)still returned the pset, while the entity's ownGlobalId/Namewere unreadable. It is retained because it also covers ids arriving from a non-TypeScript scan path.attribute-helpers.tsgetNumbergetNumber(Infinity)returnedInfinityandgetNumber(NaN)returnedNaN.attribute-helpers.tsgetReferencenumberbranch returned the value untouched.quantity-collect.tsvalue slot0for the preserved literal.georef-extractor.tsmap conversiongetNumber(...) || 0substituted a0origin.material-resolver.ts0before this PR; out of scope.source-bytes.tsclampRangeNaNfalls back to0, infinities are clamped sodecodeUtf8(2, Infinity)means "to the end".entity-scanner.tsreadNumberNumber.isFinite.schedule-extractor.tsasNumberNumber.isFinite.iso8601-duration.tsmagnitude!Number.isFinite(magnitude)before applying the sign.iso8601-duration.tsparseInt(expStr, 10)Number#toString's own output, bounded by ±324.spatial-hierarchy-builder.tsextractNumbertypeof val === 'number'fromentity-extractor.Express-id decision, and performance
The half-alive state was not acceptable: a record present enough to answer a property query but unreadable as itself, plus a genuine key collision between distinct records. The id is now rejected at each digit accumulator, so no overflowing record is ever indexed. All four accumulators are guarded together — guarding one would only have moved which scan path produced the collision.
The guard is one check per entity, not per digit. Re-measured on
scanEntitiesFastover a 1.81 MB synthetic file, median of 25 runs after warmup: 7.32 ms with the guard, 7.38 ms without — neutral, consistent with the earlier 52.5 / 52.4 ms measurement.extractMapConversionmoved to a newgeoref-map-conversion.tssogeoref-extractor.tsstays under its recorded module-size budget instead of raising it — the same split the transform side already uses.Tests
packages/parser/test/non-finite-numeric-literals.test.ts.NaN,Infinityand-Infinityare asserted separately throughout — they behave differently under the guard.Full parser suite: 886 passed | 2 skipped across 81 files (861 before this PR's new tests).
Negative controls:
2.5/-2.5/0.round-trip unchanged;1.0E308,-1.0E308and1.0E-308stay numbers (the guard rejects overflow, not magnitude);#42still resolves to42;readRefId('#0,')still returns0, not the-1sentinel; a genuine0.0quantity and a genuine0easting both survive; ordinary ids still tokenize on both scan paths; a normal element still resolves its pset. Anti-vacuity: every fixture first asserts the thing it later expects to be missing was actually produced — the finite quantity sibling, theIfcProjectedCRSalongside a refused map conversion, andparseInt(huge, 10) === Infinitybefore relying on it.Mutation checks — each broke the guard, showed the specific failure, was restored by inverse edit, and
diffagainst the pre-mutation copy was empty.isOverflowingNumericLiteralpredicate inverted (||→&&) — 8 failed: both quantity cases and all six map-conversion cases (Eastings/Northings/OrthogonalHeight × ±Infinity), e.g.expected { id: 7, sourceCRS: 5, …(7) } to be undefined.numberbranches reverted toreturn value— 6 failed:expected Infinity to be undefined,expected -Infinity to be undefined,expected NaN to be undefined, for each ofgetNumberandgetReference.expected [ Infinity, Infinity, 3 ] to deeply equal [ 3 ](the collision) andexpected [ { name: 'Pset_Test', …(2) } ] to deeply equal [](the half-alive pset).Reverting the original number branch to
!isNaN(num)still fails exactly the three infinity assertions while theNaNone passes — which is the point of splitting them.Open question for the maintainer:
patchorminor?A reviewer raised this, since an attribute's type can change
number → stringin a published package's parse output. Recommendation: keeppatch, with the precedent noted — but this is yours to call.AGENTS.md: "Bump level = biggest API change: removing/renaming an export ismajor(>=1.0 pkg) orminor(0.x), neverpatchwhen the surface shrank." The rule is about the declared export surface, which does not shrink here.patchfor bug fixes that change observed output shape:packages/parserCHANGELOG 4.2.0 (fix(parser): extract grouped RelatingPropertyDefinition instead of dropping the relationship #2887) shippedextractPropertyRelFastreturningrelatingDefs: number[]instead of a singlerelatingDef: numberas a patch; pending changesetsempty-quantity-set-parity(a quantity set that used to be present is now absent) andcomplex-quantity-phantom-countare both patch.secondsToIso8601Durationnow returnsundefinedfor non-finite input... instead ofPT0S" as a minor. If that is the governing precedent, this should beminortoo.@ifc-lite/parseris at 4.3.1, so post-1.0 semver applies. Happy to switch tominoron your word.Summary by CodeRabbit
New Features
Bug Fixes
Tests