fix(resolve): type Python locals built through a module and resolve calls through their fields

[bompus]

Two gaps found while tracing why Flask's tests had no call edge for bp.add_app_template_test(...) and app.config.from_mapping(...) (survey §6.3).

Gap 1. The Python local-type pattern required the constructor to start with a capital letter, so bp = pkg.Blueprint(), pkg.core.Blueprint(), c.Blueprint() (aliased module) and core.Blueprint() (module imported by name) left bp untyped. The pattern now accepts a lowercase module prefix. The type is still resolved against the file's imports, so factory.Blueprint() on a plain local names no project class (tested).

Gap 2. A chain through a typed local (app.config.from_mapping()) was never followed; self.config.from_mapping() was. python_self_field_call is split so the field logic takes an owner class, and a new python_local_field_call supplies the owner from the local's declared type. Unknown local types, unassigned fields and same-named methods of unrelated classes still resolve to nothing (tested).

Effect, installed build before vs this branch (Python call edges): Flask 856 to 954 (+98, 94 from tests), requests 607 to 710 (+103, 102 from tests), none removed on either. Unresolved unknown-receiver Python call refs: Flask 1,677 to 1,532, requests 991 to 865. A 30-edge sample (15 per repository, every Nth new edge) was all correct on reading each receiver's declaration; two rest on explicit annotations (connection: HTTPAdapter, app: App). The "before" build is 1.6.2+d0fe0bdf, which predates #454 and #455; neither touches Python receivers. No compiler oracle exists for Python here, so the precision check is a sample, not a measurement.

Checks. New __tests__/python-module-qualified-receiver.test.ts: 11 tests, 7 fail on the unfixed kernel and all pass with it (the 4 negative cases pass on both). Full suite: 689 files, 8,789 tests passed, 39 skipped. cargo clippy -D warnings clean through build:kernel.

Not done. Other causes of unresolved test receivers in Flask (pytest fixtures, client = app.test_client() return types, flask.<fn>()) are untouched.

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Summary by cubic

Fixes two gaps in Python local type inference so calls through module-qualified constructors and their fields resolve like class-imported ones already did.

• bp = pkg.Blueprint(), c.Blueprint(), and core.Blueprint() now type the local, just like bp = Blueprint() from a name import; the type is still resolved against the file's imports, so factory.Blueprint() on another local object still resolves to nothing.
• A parameter that shadows the imported module (e.g. def t(pkg): after import pkg) blocks both typing and field-chain resolution through that name.
• app.config.from_mapping() now resolves on the class the local's declared type holds, matching the existing self.config.from_mapping() handling; unknown local types, unassigned fields, and same-named methods of unrelated classes still resolve to nothing.
• Adds 98 call edges to Flask and 103 to requests (almost all in tests); a 30-edge manual sample (15 per repository) was all correct, with two resting on explicit annotations.

^{Written for commit 255a67a. Summary will update on new commits.}

Summary by CodeRabbit

• Bug Fixes
  • Python calls through dotted, aliased, or re-exported module paths now resolve constructors to the imported class.
  • Calls to methods through fields of typed local objects now resolve to the appropriate class methods, including inherited methods.
  • Calls with unknown, unrelated, or unassigned receiver types remain unresolved. These changes add accurate call relationships in projects such as Flask and requests.

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📒 Files selected for processing (2)

• __tests__/python-module-qualified-receiver.test.ts
• codegraph-kernel/src/resolve/member_fn_ref.rs

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📝 Walkthrough

Walkthrough

Python call resolution now recognizes module-qualified class constructors and uses inferred local field types to resolve method calls. Tests cover supported import forms, inherited methods, and cases where receiver or field types cannot be resolved.

Changes

Python receiver resolution

Layer / File(s)	Summary
Recognize qualified constructors codegraph-kernel/src/resolve/affix.rs, __tests__/python-module-qualified-receiver.test.ts	The constructor-call pattern accepts dotted module prefixes before class names. Tests cover constructor forms and expected call targets.
Resolve methods through local fields codegraph-kernel/src/resolve/member_fn_ref.rs, codegraph-kernel/src/resolve/method_call.rs, __tests__/python-module-qualified-receiver.test.ts, CHANGELOG.md	For dotted Python calls, the resolver infers the local receiver’s class and resolves a field method when its type is known. Tests cover resolved and unresolved cases. The changelog records the change.

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Priority: ➖ Normal

Merge Risk: ⚪ Minimal · up to 255a6

No concrete merge-blocking risk remains in the reviewed changes.

Pre-merge checks | 6

✅ Passed checks (6 passed)

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely describes the main changes: resolving Python locals constructed through modules and resolving calls through their fields.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.
Suppressions Explained		The pull request adds no lint, type-check, or compiler-suppression directive. The changed files contain code, tests, and explanatory comments only; no eslint-disable, TypeScript suppression, Rust `#…
User-Visible Changes Documented		PASS. The diff changes Python receiver resolution, adds tests, and updates CHANGELOG.md. It does not add, remove, or rename a CLI command or flag, MCP tool or argument, supported language or framework…

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Actionable comments posted: 1

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Inline comments:
Review comments at @codegraph-kernel/src/resolve/affix.rs:
- Line 253: Update the import-root check in python_ref_class to resolve a module
root only when it matches an import mapping and is_shadowed_import confirms it
is not shadowed in the current scope; leave shadowed roots out of import-based
class resolution.

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• Configuration used: Repository YAML (base), Organization UI (inherited)
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📥 Commits

Reviewing files that changed from the base of the PR and between 94afb88 and ad48de7.

📒 Files selected for processing (5)

• CHANGELOG.md
• __tests__/python-module-qualified-receiver.test.ts
• codegraph-kernel/src/resolve/affix.rs
• codegraph-kernel/src/resolve/member_fn_ref.rs
• codegraph-kernel/src/resolve/method_call.rs

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[cubic-dev-ai]

All reported issues were addressed across 5 files

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