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refactor: extract _DelimitedConverter base from DelimitedCollection - #82

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refactor: extract _DelimitedConverter base from DelimitedCollection#82
msto wants to merge 1 commit into
msto/delimited-collection-typesfrom
msto/delimited-converter-base

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@msto msto commented Jun 17, 2026

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Summary

This PR is the third in a stack to expand Metric's collection parsing behavior to support tuple, set, and dict along with the existing list support, to provide parity with fgpyo.

This PR is a pure refactor. It extracts a new _DelimitedConverter base class for DelimitedCollection and the planned DelimitedMapping mixin (added in the next PR). This was done to share the collection_delimiter class variable and field serializer.

Related Stack

Move the collection_delimiter class variable, the field-classification scan,
and the shared field validator/serializer into a non-exported
_DelimitedConverter base; DelimitedCollection becomes a thin subclass that
carries only the user-facing docstring.

This sets up the single field_serializer("*") on a shared base, which a second
delimited converter can build on without colliding (Pydantic permits only one
serializer per field across the MRO). The base dispatches on the classification
sets directly, so the test-only _is_collection_field predicate is dropped.

Pure refactor; no behavior change.

Relates to #76.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
@msto msto self-assigned this Jun 17, 2026
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Reviewing files that changed from the base of the PR and between 118656d and 2615c70.

📒 Files selected for processing (3)
  • fgmetric/converters/_delimited.py
  • fgmetric/converters/_delimited_collection.py
  • tests/test_delimited_collection.py

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@msto

msto commented Jun 17, 2026

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