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feat: enforce single-value invariant (ADR-0004) and expose recognition span - #24
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ADR-0004 single-value invariant (opt-in): - Grammar.single_value (default False) opts a grammar into the check. - Engine clusters candidate spans by overlap into mentions and fails fast with MultipleMentionsError when >=2 non-overlapping mentions resolve to distinct values. Cross-grammar multi-entity input (e.g. one number via E.164, another via national) is now caught; genuine single-mention ambiguity stays AMBIGUOUS. - All 26 shipped grammar classes opt in; seam probes stay exempt. Span exposure (previously None in the public result): - Candidate.span and ExecutionResult.span carry the half-open [start, end) source range, populated from the RecognitionMatch/RecognizedRep span. Docs/tests: ADR-0004 updated; README Recognition Span section added; new test_single_value_invariant.py and test_span_exposure.py; multi-entity assertions updated to expect MultipleMentionsError.
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Included review availability: Your plan includes up to 1 review per rolling hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe PR adds half-open recognition spans to candidates and execution results. It adds opt-in single-value validation for grammars, raises ChangesSingle-value recognition
Estimated code review effort: 3 (Moderate) | ~30 minutes Merge Risk: ⚪ Minimal · up to The change adds opt-in single-value enforcement and exposes recognition spans, with no actionable merge-blocking risk remaining after normal checks and review. Sequence Diagram(s)sequenceDiagram
participant Caller
participant run_capability
participant Grammar
participant Candidate
participant ExecutionResult
Caller->>run_capability: canonicalize input
run_capability->>Grammar: recognize spans
Grammar-->>run_capability: recognized values and spans
run_capability->>Candidate: create span-bearing candidates
run_capability->>run_capability: enforce single-value invariant
run_capability-->>ExecutionResult: return status, candidates, and winning span
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Inline comments:
In `@docs/adr/0004-single-value-invariant.md`:
- Around line 106-107: Update the public-surface consequence in the ADR to
acknowledge the new Candidate.span and ExecutionResult.span fields alongside
MultipleMentionsError, and remove the inaccurate claim that the ExecutionResult
shape is unchanged.
In `@paxman/core/domain.py`:
- Around line 174-179: Validate Candidate.span in the Candidate initializer
before storing it: allow None or a half-open range with non-negative start and
end greater than or equal to start, and reject invalid ranges such as negative
or descending bounds. Preserve valid spans and store the validated value through
the existing object.__setattr__ calls.
In `@paxman/engine/orchestrator.py`:
- Around line 394-399: Update the cluster-merging loop around _spans_overlap so
a span is merged into every overlapping cluster, not just the first match;
combine all matched clusters with the new span and remove the redundant cluster
entries, while preserving creation of a new singleton cluster when none overlap.
- Line 99: The orchestrator must not assign an arbitrary span from candidates[0]
when duplicate mentions resolve to the same value. Update the
_dedup_candidates() and ExecutionResult construction flow to return None
whenever validated source spans are not unique, or establish and document an
explicit representative-span policy; ensure the README’s “winning” span claim
matches the implemented behavior.
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README.mddocs/adr/0004-single-value-invariant.mdpaxman/capabilities/Country/grammar/alpha2_recognition.pypaxman/capabilities/Country/grammar/alpha3_recognition.pypaxman/capabilities/Country/grammar/name_recognition.pypaxman/capabilities/Country/grammar/numeric_recognition.pypaxman/capabilities/Currency/grammar/code_recognition.pypaxman/capabilities/Currency/grammar/symbol_recognition.pypaxman/capabilities/Currency/grammar/word_recognition.pypaxman/capabilities/Date/grammar/european_recognition.pypaxman/capabilities/Date/grammar/iso8601_recognition.pypaxman/capabilities/Date/grammar/slash_iso_recognition.pypaxman/capabilities/Date/grammar/us_recognition.pypaxman/capabilities/Email/grammar/localhost_recognition.pypaxman/capabilities/Email/grammar/obfuscated_recognition.pypaxman/capabilities/Email/grammar/standard_recognition.pypaxman/capabilities/IP/grammar/ipv4_recognition.pypaxman/capabilities/IP/grammar/ipv6_recognition.pypaxman/capabilities/ISBN/grammar/isbn10_recognition.pypaxman/capabilities/ISBN/grammar/isbn13_recognition.pypaxman/capabilities/Money/grammar/code_recognition.pypaxman/capabilities/Money/grammar/symbol_recognition.pypaxman/capabilities/Money/grammar/word_recognition.pypaxman/capabilities/Phone/grammar/e164_recognition.pypaxman/capabilities/Phone/grammar/international_00_recognition.pypaxman/capabilities/Phone/grammar/national_recognition.pypaxman/capabilities/Phone/grammar/tel_uri_recognition.pypaxman/capabilities/URL/grammar/absolute_uri_recognition.pypaxman/core/__init__.pypaxman/core/domain.pypaxman/core/errors.pypaxman/engine/orchestrator.pytests/integration/test_ambiguity.pytests/integration/test_date_capability.pytests/integration/test_format_value_seam.pytests/integration/test_money_pipeline.pytests/integration/test_phone_pipeline.pytests/integration/test_pipeline.pytests/integration/test_single_value_invariant.pytests/integration/test_span_exposure.pytests/unit/test_candidate.py
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Candidate.span now enforces the same half-open [start, end) and raw_text-length invariants as RecognitionMatch, so a malformed recognition position cannot propagate into ExecutionResult. Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent) Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
_enforce_single_value_invariant now merges ALL clusters a span overlaps into one connected component. Previously only the first matching cluster was merged, which could split a single logical mention and raise a false MultipleMentionsError.
ExecutionResult.span is wired to the source span of the single resolved value (None for MISSING/INVALID/AMBIGUOUS), closing the gap where it was always None.
Scope notes (intentionally skipped / out of scope):
- Span is derived from the candidate value count (len({value}) == 1) rather than status == Resolution.SUCCESS. Deliberate: the project forbids Resolution.* access outside _determine_status / _extract_canonical_value (test_status_computed_only_in_determine_status), so the gate lives in run_capability without touching that invariant.
- The pre-existing candidate-doubling (multiple validation rules firing per recognition, collapsed by _dedup_candidates) is unchanged: altering rule firing is a separate concern and dedup already yields one candidate.
- The MultipleMentionsError message text is unchanged from the PR #24 implementation; only the clustering correctness was corrected.
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
README 'Recognition Span' section describes ExecutionResult.span and per-candidate Candidate.span; ADR-0004 wording aligns with the connected-component clustering behavior. Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent) Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
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Summary
Grammar.single_value(defaultFalse) opts a grammar into the check. The engine clusters candidate spans by overlap into "mentions" and fails fast withMultipleMentionsErrorwhen ≥2 non-overlapping mentions resolve to distinct values. Cross-grammar multi-entity input (e.g. one number via E.164, another via national) is now caught; genuine single-mention ambiguity staysAMBIGUOUS. All 26 shipped grammar classes opt in; span-bearing seam probes stay exempt.Candidate.spanandExecutionResult.spannow carry the half-open[start, end)source range (previouslyNonein the public result), populated from theRecognitionMatch/RecognizedRepspan.Test plan
tests/integration/test_single_value_invariant.pyandtests/integration/test_span_exposure.py.MultipleMentionsError.ruff check,pyright(0 errors), andimport-linter lintall green.Docs
docs/adr/0004-single-value-invariant.mdrewritten for the opt-in / overlap-clustering design.Risk / notes
Candidate.__eq__/ hashing now considerspan; test doubles that omit it getNoneand remain equal to each other.Summary by CodeRabbit
MultipleMentionsError.