fix(parser): apply every delta section header - #1802
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Included review availability: Your plan provides up to 10 included reviews per hour; 9 remain after this review. 📝 WalkthroughWalkthroughThe delta parser now preserves repeated and case-variant section headers. It processes every matching section body and retains each body’s source line. Tests cover parsing and rebuilding specifications from repeated sections. ChangesDelta section handling
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to Repeated and case-variant delta headers now retain and apply all authored requirements instead of silently discarding sections. Covered parsing and rebuild behaviors indicate no remaining merge-blocking risk. Suggested reviewers: Sequence Diagram(s)sequenceDiagram
participant parseDeltaSpec
participant getSectionsCaseInsensitive
participant parseRequirementBlocksFromSection
participant parseRemovedNames
participant parseRenamedPairs
parseDeltaSpec->>getSectionsCaseInsensitive: find all matching section bodies
getSectionsCaseInsensitive-->>parseDeltaSpec: return bodies in document order
parseDeltaSpec->>parseRequirementBlocksFromSection: parse each matching body
parseDeltaSpec->>parseRemovedNames: collect names from each matching body
parseDeltaSpec->>parseRenamedPairs: collect pairs from each matching body
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In `@test/core/parsers/delta-section-collision.test.ts`:
- Around line 220-224: Update the test using parseDeltaSpec so it exercises a
later added section: include a preceding non-matching top-level section in the
fixture and assert plan.sectionPresence.added is true. Remove the existing
removed assertion, since it does not validate the condition described by the
test.
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src/core/parsers/requirement-blocks.tstest/core/parsers/delta-section-collision.test.ts
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alfred-openspec
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Reviewed the section collection change and ran the focused 15-test suite locally. Repeated and case-variant sections are retained in document order without weakening duplicate checks. Approved.
Closes #1801.
Why
A change's delta file that writes the same delta header twice — two
## ADDED Requirementssections, say — silently kept only one of them. Everyrequirement under the discarded copy was gone before validation or the merge
could see it, so
openspec validatereported the change valid with zero issuesand
openspec archiveexited 0 saying "Specs updated successfully" havingapplied less than the author wrote. The change then moved to
openspec/changes/archive/, so the active change disappeared while the livespec quietly diverged from what was authored and reviewed.
Two separate mechanisms produced it:
splitTopLevelSectionscollected sections into aRecord<string, SectionBody>keyed by title, so a repeated title overwrote the earlier body (last wins).
getSectionCaseInsensitivereturned the first entry whose title folded tothe target, so
## ADDED Requirementsand## Added Requirements— distinctobject keys — left the second one unread (first wins).
Neither path counted or recorded what it dropped, which is why every downstream
guard (duplicate detection, cross-section conflicts, the scenario-loss check,
the archive preflight, and archive's post-merge spec validation) was blind to it:
they all work from the already-truncated
DeltaPlan.The author does not have to repeat a header on purpose to hit this. A delta that
documents OpenSpec's own syntax inside a fenced example produces the duplicate on
its own, because an inner ``` closes the outer fence and leaves the
## ADDED Requirementsline inside the example unmasked.What Changes
splitTopLevelSectionsreturns a list of{ title, body }in documentorder instead of a title-keyed record, so every occurrence survives.
getSectionCaseInsensitivebecomesgetSectionsCaseInsensitiveand returnsevery body whose title folds to the target, in document order.
parseDeltaSpecreads each matching body and concatenates the results, soADDED / MODIFIED / REMOVED / RENAMED all apply in full.
bodyStartLine, soskippedHeadersline numbers arenow correct for the copy the header actually came from (previously the lookup
handed one section's start line to whichever body won).
FROM:in one copy can never pairwith a
TO:in another.No behaviour changes for a delta that writes each header once — that path is
covered by a regression test in this PR.
Testing
test/core/parsers/delta-section-collision.test.ts— 15 tests, written first andwatched fail (11 failed / 4 passed before the change, 15 passed after).
Edge cases covered:
ADDED; case-variantADDED; the header three times in three casingsREMOVED(both names and blocks) and repeatedRENAMEDFROM:in one section and aTO:in another must not pairskippedHeadersline numbers resolve against the correct copysectionPresenceduplicate error rather than silently winning
Full suite green on this branch.
Changeset
Not added. Per
.changeset/README.mdthe default path is the normal releasecadence; happy to run
pnpm changesetif a maintainer wants dedicated releasenotes for this fix.
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