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Remove intermediate throws from lens reads and untyped scalar decode - #74

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@veewee veewee commented Oct 14, 2026 •

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Stacked on #73 (#73), which added the throw counting and the baseline. This PR removes the intermediate throws that come from this package's own code: the lookups for absent elements, attributes and properties, and the try chain in the untyped scalar decoder. Output does not change.

It requires the released veewee/reflecta ^1.1, which carries optional_index() and optional_property() (veewee/reflecta#39).

Absent elements and properties

ObjectAccess::build used reflecta's index() and property() as the built-in lenses. Both throw for every absent element, attribute or property, and the exception was caught again by optional() or by runLens and turned into null. They are now reflecta's optional_index() and optional_property() from veewee/reflecta#39, which have the same contract as optional(index()) and optional(property()) but return null without throwing. A miss already gives null, so I use them without the optional() wrapper, whether or not the property is nullable or an optional attribute. ObjectAccess keeps its shape and the ObjectEncoder loops are unchanged.

Custom lenses from ProvidesObjectEncoderLens and ProvidesObjectDecoderLens, AnyElementEncoder included, keep the optional() wrapping and the runLens catch exactly as before. A regression test registers an encoder whose custom lenses throw on a missing property and checks the encoded and decoded output next to an xsd:any.

I put the non throwing lenses in reflecta and added no lookup types to this package. The reads only fetch a mixed value that the per-property iso coerces anyway, so new types here would add a layer to the same pipeline, and in reflecta other users get the faster lenses too.

Untyped scalar decode

An untyped value went through Psl's int, float and bool coercion in turn, and every miss threw, so a plain word threw three or four times. The decoder now checks the same rules before deciding. The int and float checks repeat Psl's string coercion, including its trimming of leading zeros that decodes '0-5' as -5, which I kept on purpose. I did not put a cheap guard in front of the Psl calls: decimals and exponents are the common untyped values, and a check tight enough to let them through without a throw ends up reimplementing the rules.

The test uses Psl itself as the oracle: it compares the decoder with Type\int()->coerce() and Type\float()->coerce() over every string up to four characters from a set of digits, signs, dots, exponents and whitespace, plus the int boundaries, using var_export so that -0.0 against 0.0 and int against float differences fail. If a Psl upgrade changes the coercion rules, that test fails. It also passes with the lowest Psl version the constraints allow (6.1.0).

Throw report

composer throws:report on the branch suite:

Site #73 on reflecta 1.0.0 This PR on reflecta 1.1.0
reflecta UnreflectableException on stdClass hydration 202 0
Psl CoercionException and RestrictionException in the untyped scalar chain 98 0
reflecta ArrayAccessException for an absent element or attribute 36 1
reflecta UnreflectableException and Error for an absent or uninitialised property 37 1
engine MetadataException for a builtin soap-enc item type 23 25
Psl AssertException from a test encoder that calls veewee/xml 4 4

The one ArrayAccessException and UnreflectableException left come from the custom lens regression test, which throws on purpose. stdClass hydration also dropped to 0 without a change here, because reflecta 1.1.0 (veewee/reflecta#37) hydrates stdClass with a cast and looks properties up without throwing. The two extra engine throws come from soap-enc scenarios that run through the same lookup; #75 brings that row to 0. The assertNoThrows() tests cover every scenario from #73 except the soap-enc array, plus untyped values through SimpleListEncoder, ApacheMapEncoder and SoapObjectEncoder.

The total number of throws in the report goes up, because the scalar test calls Psl's throwing coercion as its oracle. Those throws are in the test, outside src/, and the report does not count them as intermediate.

Benchmarks

vendor/bin/phpbench run benchmarks/ --report=aggregate, Xdebug off, PHP 8.4.13 on macOS, against the baseline stored for #73:

Benchmark Subject Baseline This PR Diff
EncodeBench benchLiteral_x1 73.205μs 71.966μs -1.69%
EncodeBench benchLiteral_x500 35.620ms 33.078ms -7.14%
EncodeBench benchEncoded_x1 116.652μs 111.497μs -4.42%
EncodeBench benchEncoded_x500 57.515ms 58.319ms +1.40%
EncodeBench benchExtSoapLiteral_x1 7.117μs 7.384μs +3.76%
EncodeBench benchExtSoapLiteral_x500 3.768ms 3.857ms +2.35%
EncodeBench benchExtSoapEncoded_x1 11.428μs 12.131μs +6.15%
EncodeBench benchExtSoapEncoded_x500 5.904ms 6.217ms +5.29%
DecodeBench benchLiteral_x1 85.347μs 60.405μs -29.22%
DecodeBench benchLiteral_x500 39.891ms 31.846ms -20.17%
DecodeBench benchLiteralSparse_x1 76.028μs 47.160μs -37.97%
DecodeBench benchLiteralSparse_x500 38.164ms 22.946ms -39.87%
DecodeBench benchEncoded_x1 116.398μs 97.900μs -15.89%
DecodeBench benchEncoded_x500 57.570ms 46.002ms -20.09%
DecodeBench benchExtSoapLiteral_x1 10.434μs 11.420μs +9.45%
DecodeBench benchExtSoapLiteral_x500 5.532ms 5.356ms -3.19%
DecodeBench benchExtSoapEncoded_x1 15.006μs 16.363μs +9.05%
DecodeBench benchExtSoapEncoded_x500 8.055ms 7.737ms -3.94%

The ExtSoap subjects run ext-soap and none of this code, so their -4% to +9% is the noise on this machine. Encode stays within that noise, which is expected because the encode fixture threw 0 times before. On decode, a run in one session with only the reflecta branch and no src change shows where the gain comes from: the complete fixture's gain is reflecta#37 (benchLiteral_x1 at 64μs without the changes here, 61μs with them), and the lens change in this PR takes the sparse decode from 63μs to 47μs and from 29.6ms to 24.5ms for x500.

Left for the next PR

The engine type lookup for soap-enc arrays of a builtin item type still throws once per array. It needs a non throwing lookup in php-soap/engine, so the next PR bumps the engine and reflecta releases, brings that to 0 and adds a guard job that fails on any intermediate throw over the whole suite. That guard also has to decide what to do with the AssertException from the test encoder. #75 also has the end to end comparison on 3MB responses against main and #70.

Summary by CodeRabbit

  • Bug Fixes
    • Encoding and decoding now better handle optional or missing properties when custom accessors are used, reducing failures for absent values.
    • Untyped scalar decoding more consistently recognizes integers, decimal and exponent-form numbers, and lowercase boolean values while preserving other strings.
  • Compatibility
    • Improved support for custom object and array accessors, including accessors provided through decorating encoders.

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📒 Files selected for processing: 10
  • composer.json
  • src/Coerce/Scalar.php
  • src/Encoder/ObjectAccess.php
  • src/Encoder/SimpleType/ScalarTypeEncoder.php
  • tests/Fixture/Encoder/ThrowingLensEncoder.php
  • tests/Integration/IntermediateThrowScenariosTest.php
  • tests/Integration/NoIntermediateThrowsTest.php
  • tests/Unit/Coerce/ScalarTest.php
  • tests/Unit/Encoder/ObjectEncoderCustomLensTest.php
  • tests/Unit/Encoder/SimpleType/ScalarTypeEncoderUntypedDecodeTest.php
📝 Walkthrough

The change updates object property lens access and untyped scalar decoding. It also updates the Reflecta dependency and adds fixtures and tests for these behaviors.

Changes: Optional object lenses

Layer / File(s) Summary
Custom and optional object access
composer.json, src/Encoder/ObjectAccess.php, tests/Fixture/Encoder/ThrowingLensEncoder.php, tests/Unit/Encoder/ObjectEncoderCustomLensTest.php, tests/Integration/IntermediateThrowScenariosTest.php
The project uses Reflecta’s dev-feature/optional-lenses branch, aliased as 1.1.0. ObjectAccess uses custom object lenses when available and falls back to optional property or index access. Tests cover custom lenses with present and missing values. An integration scenario encodes an object that omits schema properties.

Untyped scalar decoding

Layer / File(s) Summary
Scalar conversions and validation
src/Encoder/SimpleType/ScalarTypeEncoder.php, tests/Unit/Encoder/SimpleType/ScalarTypeEncoderUntypedDecodeTest.php, tests/Integration/NoIntermediateThrowsTest.php
ScalarTypeEncoder uses explicit integer, float, and boolean conversion rules for untyped values, and returns other strings unchanged. Unit tests compare the results with a Psl-based oracle. Integration tests check decode results and internal throws.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix

Merge Risk: 🟡 Moderate · up to a46d7

The code changes look sound, but the library depends on an unreleased Reflecta branch. Projects that install this version would fail to resolve the dependency. Wait for a tagged Reflecta release that includes the optional lenses, then require that version before merging.

Pre-merge checks: Passed 4 · Failed 1

Failed Failed checks: 1 warning

Check name Status Explanation Resolution
Docstring Coverage Warning Docstring coverage is 61.54% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 26 functions across 7 files. (1 skipped: … Write docstrings for the functions missing them to satisfy the coverage threshold.
Passed Passed checks: 4 passed
Check name Status Explanation
Linked Issues check Passed Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check Passed Check skipped because no linked issues were found for this pull request.
Description Check Passed Check skipped - CodeRabbit’s high-level summary is enabled.
Title check Passed The title clearly and concisely describes the two main changes: removing intermediate throws from lens reads and changing untyped scalar decoding.
Full details: Docstring Coverage

Explanation

Docstring coverage is 61.54% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 26 functions across 7 files. (1 skipped: 1 unsupported.)

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Actionable comments posted: 1


  • 🪄 Fix comments: Fix CodeRabbit comments on this PR
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Review comments at @composer.json:
- Line 43: Update the veewee/reflecta requirement in composer.json to use a
published version that includes both optional-lens functions; do not retain the
unresolved development-branch alias when releasing this change.

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📒 Files selected for processing: 8
  • composer.json
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  • src/Encoder/SimpleType/ScalarTypeEncoder.php
  • tests/Fixture/Encoder/ThrowingLensEncoder.php
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Comment thread composer.json Outdated
"php-standard-library/type": "^6.1",
"php-standard-library/vec": "^6.1",
"veewee/reflecta": "^1.0.0",
"veewee/reflecta": "dev-feature/optional-lenses as 1.1.0",

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🎯 Functional Correctness | 🟠 Major | 🏗️ Heavy lift

Require a Reflecta release that consumers can resolve.

If a project installs this library before the optional lenses are released, Composer ignores this library’s VCS repository and retains only 1.1.0 from the inline alias. The consuming project then cannot resolve the required implementation without its own override. Reflecta’s optional-lens PR remains open. Replace the branch alias with a published version that contains both functions before releasing this change. (getcomposer.org)

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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
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Review comment at @composer.json at line 43:
Update the veewee/reflecta requirement in composer.json to use a published
version that includes both optional-lens functions; do not retain the unresolved
development-branch alias when releasing this change.

After applying the fix, consider running `coderabbit review --agent` for local
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Agreed, and this is intentional for now: the branch alias only exists so CI can run against veewee/reflecta#39 before it is released. The PR description lists it as a merge blocker, and the constraint goes back to a released ^1.1 before this is merged.

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@veewee Thanks for clarifying. The temporary CI dependency is intentional, and the documented merge blocker covers the release concern. No additional change is needed now.

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@veewee
veewee added this pull request to stack #77 October 15, 2026 06:54
Base automatically changed from throwless/01-throw-counter-and-baseline to main October 15, 2026 06:56
@veewee
veewee force-pushed the throwless/02-throwless-own-code branch from 685413d to b6f29dc Compare October 15, 2026 06:56
veewee/reflecta#39 adds optional_index() and optional_property(), stacked on #37. Until 1.1.0 is tagged the branch comes in through a VCS repository aliased as 1.1.0, so this cannot be merged before the constraint is back on a release.
The built-in lenses were index() and property(), which throw for every absent element, attribute or property, and the exception was caught again by optional() or runLens. reflecta's optional_index() and optional_property() return null in those cases without throwing, which is what the caught exception turned into before, so they replace the built-in lenses unwrapped whether or not the property is optional.

Custom lenses from ProvidesObjectEncoderLens and ProvidesObjectDecoderLens keep the optional() wrapping and the runLens catch.
An untyped value went through Psl's int, float and bool coercion in turn and every miss threw a CoercionException, so a plain string threw three or four times. The decoder now checks the same rules up front: the int and float checks repeat Psl's string coercion, including its trimming of leading zeros that decodes '0-5' as -5. The test compares the result with Psl itself over every short string, so a Psl upgrade that changes those rules shows up as a failure.
The untyped decode lived as a private method on ScalarTypeEncoder. As its own
class the int, float and bool steps can be reused by other encoders and tested
one by one against their Psl counterparts. The class is internal, so it adds
no BC surface.
@veewee
veewee force-pushed the throwless/02-throwless-own-code branch from bea67a3 to 6566d77 Compare October 15, 2026 07:24
@veewee
veewee merged commit bb3ad0e into main Oct 15, 2026
24 checks passed
@veewee
veewee deleted the throwless/02-throwless-own-code branch October 16, 2026 08:49
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