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feat(signature): the change_signature operation (#1533, 4/9) - #2166
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| Check name | Status | Explanation |
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| Linked Issues check |  |
Check skipped because no linked issues were found for this pull request. |
| Out of Scope Changes check | |
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The title is concise, follows Conventional Commits format, and accurately identifies the main change: adding the change_signature operation. |
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The description is complete and relevant. It covers the implementation, user-visible status, change type, related issues, tests, manual validation, dependencies, and known unchecked items. |
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Inline comments:
Review comments at @codebase_rag/editing/signature.py:
- Around line 383-388: Update plan and _stage so _stage reuses the source bytes
read by the planning Patcher as its overlay, rather than rereading files to
apply spans. Before staging edits, compare each planned source with the current
disk content through EditTransaction and refuse the change with the existing
edit-conflict error if any file differs.
- Around line 371-372: Update the method-call binding path around
`_bind_arguments` to exclude the explicit receiver for class-qualified calls
when the method header has a receiver, before binding arguments; if the receiver
cannot be safely excluded, mark the site `_Unmapped` so `_render_site` cannot
rewrite shifted arguments.
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codebase_rag/editing/signature.py
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Fixed in ff89d3d. Generated by Claude Code |
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@greptile review |
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 [Medium impact] The PR appears safe to merge, with no outstanding high-severity findings. SummaryAdds
Diagram%%{init: {'theme': 'neutral'}}%%
flowchart TD
A[Read definitions and callers] --> B[Plan headers and call edits]
B --> C[Report unmapped callers]
B --> D[Stage edits]
D --> E{Files unchanged and edits parse?}
E -->|No| F[Refuse or roll back]
E -->|Yes| G[Commit transaction]
G --> H{Re-ingestion available?}
H -->|No| I[Return report]
H -->|Yes| J[Check post-change contract]
J -->|Pass| I
J -->|Fail| F
Reviews (3) · Last reviewed commit: "fix(signature): refuse a new parameter t..." · Reviewed by Greptile |
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… the planned bytes A call that reaches an instance method through its class, `Base.f(obj, a)` (or `cls.f`, `type(obj).f`, `obj.__class__.f`), passes the receiver as its first argument; binding it to the first declared parameter shifted every value one slot. Such a site is now listed as unmapped. `_stage` re-read every file from disk, so a file changed after planning had the edits spliced at offsets measured in other bytes. The edits are now applied to the planning patcher's own sources, and a file whose disk content no longer matches them is refused. Adds tests for the operation: apply under the contract, preview, plan, parse-failure rollback, the refusals, the sites it cannot read, and a regression test for each fix.
…o returns the guessed set
#2162 now spells reordered values by keyword in their written order, so the dry run renders `helper(a=3, b='z')` rather than `helper('z', 3)`.
…ents #2162 reorders a site positionally again when its values are only names and plain literals, so the dry run renders `helper('z', 3)` once more.
Windows' monotonic clock advances in coarse steps, so Deadline.after(60) and seconds_left() can read the same value t, and (t + 60) - t then rounds above 60 (60.00000000000006 on the windows py3.12 shard). Allow that rounding instead of requiring an exact upper bound.
… aliases Two ways the operation could report success and leave broken code: - An override keeps its own defaults and the receiver is put back after the new list is checked, so reordering `a, c, b` across `Base.f(self, a, b=1, c=2)` and `Sub.f(self, a, b, c=2)` wrote `def f(self, a, c=2, b)`, and a new `self=None` repeated the receiver. Tree-sitter parses both. Each rewritten header now goes through the compiler's symbol-table pass and is refused when Python would reject it. - `from pkg.shapes import Base as base` made `base.f(obj, 5)` read as an instance call, so the receiver bound to the first parameter and every value shifted a slot. A name a `from` import binds is now read as the name it imports before deciding whether the call goes through a class.
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@greptile review |
…p dropped calls A genuinely new parameter shadows whatever the body read under that name: adding `len=None` to `def f(a): return len(a)` made the body call the parameter. The plan now refuses it, as it already did for a rename target. A call site whose value for a dropped parameter runs code is left unmapped instead of losing that code: `f(1, save())` no longer becomes `f(1)`.
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@greptile review |
…ws line endings pass
Brings main's security fixes onto the branch: certifi 2026.10.23 and grpcio 1.84.1 (PYSEC-2026-4320 and the distrusted eMudhra/emSign roots), the emSign root distrust in the build images and CI, virtualenv 21.14.13, opentelemetry-api 1.45.1 and mcp 1.30.0. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_013XGhW4XyyMT6RuWcNtbGwC
Brings in the repair of red main (#3448). The one conflict, the seconds-left deadline test, takes main's frozen-clock version, which replaces this branch's rounding tolerance for the same Windows flake. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01NVdycfDFvbqaoyHWVWHJ1N
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Update: the CodeQL, OSV-Scanner and NuGet jobs each passed on their one re-run at The original note follows. Three checks failed on
Generated by Claude Code |
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Summary
codebase_rag/editing/signature.py.SignatureChangerplans a parameter-list change over the override hierarchy and every graph-known call site, stages it in an edit transaction and applies it. With a re-ingest available, it enforces the postcondition contract and rolls back on failure.change_signature()is the entry point. A call site the mapping cannot complete is listed as unmapped and left untouched.Demo
No user-visible change: adds the
change_signatureoperation as an internal API, which #2164 exposes through the CLI and MCP.Type of Change
Related Issues
Part of #1533 (split from #1912; stack: #2163 → #2161 → #2162 → #2166 → #2164 → #2169 → #2168 → #2165 → #2167).
Test Plan
Unit tests pass (
make test-paralleloruv run pytest -n auto -m "not integration")New tests added
Integration tests pass (
make test-integration, requires Docker)Manual testing (describe below)
uv run python -m pytest codebase_rag/tests/test_signature_changer.py -p no:randomly -qat025a7976b: 39 passed.The full suite was not run locally. The CI Unit Tests run at
025a7976bwas cancelled before it finished.Manual, at
025a7976bagainst Memgraph 3.3.0: a script calledchange_signature(..., ["price", "pct", "currency: str"], mapping={"currency": '="EUR"'}, dry_run=True)on a smallshoprepo whosediscount(price, pct)has three callers. It reported 2 sites to rewrite (discount(p, 10, "EUR")anddiscount(price=p, pct=25, currency="EUR")) and listed thediscount(*args)caller as unmapped.Checklist
make pre-commit)# type: ignore,cast(),Any, orobjecttype hintsSKIP=no-commit-to-branch pre-commit run --from-ref b798f5720 --to-ref 025a7976b(ruff, ruff-format, ty, bandit, generate-readme and the file hygiene hooks): passed. The unit-suite step ofmake pre-commitwas not run locally.Unchecked items:
signature.pyreads graph rows by inline keys (definition["path"],row["line"]and similar).test_signature_changer.pyhas three# type: ignorecomments andobjecthints on two test helpers.Files changed
codebase_rag/constants/ast_python.pycodebase_rag/constants/cli.pycodebase_rag/editing/signature.pycodebase_rag/tests/test_signature_changer.pyDiff stats
+1020 additions, -0 deletions (1020 LOC)
Dependencies
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pr-3Dependency graph
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