ossuminc / riddl / 28683473913
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reid-spencer 
Add compareRoots — Root-AST structural similarity API

Adds a deterministic, model-free similarity/diff API for comparing two
RIDDL Root ASTs, requested by ossum-gen for its compositional-fidelity
benchmark (regression guard: does a model generated from a README have
the same rough shape as the hand-authored corpus model?).

New in passes/analysis/RootComparison.scala (Native-safe, no regex or
java formatting):
- compareRoots(a, b) -> RootSimilarity: per-kind counts (Map[String,
  (Int,Int)]), fuzzy matched/unmatched name pairs per kind, structural
  metrics (max depth, breadth), and an overall weighted score in
  [0.0, 1.0] (exactly 1.0 for identical roots).
- similarityMarkdown(a, b): human/AI-readable report.
- Both surfaced on the RiddlLib trait and object (additive only; no
  existing signature changed).

Counts/names/breadth are taken from OutlinePass (records containers AND
leaves, so leaf kinds such as Invariant/Constant are included, and
counts stay consistent with the names being matched); depth is taken
from StatsPass.maximum_depth. Structural wrappers (Root, Nebula) are
excluded so breadth reflects real top-level containers. Matching is on
kind + fuzzy name (lowercase-alphanumeric normalization, greedy best
Levenshtein-ratio pairing) — location- and case-independent — never on
Definition.equals/hashCode (which include loc).

Scoring: per kind 0.6*countComparability + 0.4*nameOverlap; overall
0.7*weightedMean + 0.3*countVectorCosine, weighting DDD-structural
kinds above incidental ones.

10 tests (JVM + Native): identical=1.0, empty=1.0, counts match a manual
StatsPass reading, breadth counts domains not Root, depth matches
StatsPass, case/location independence, renamed-but-equal stays high,
ordering identical > case-only > renamed > unrelated, markdown render,
and a real-model pair (dokn vs rbbq).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

147 of 156 new or added lines in 1 file covered. (94.23%)

39 existing lines in 20 files now uncovered.

7679 of 11769 relevant lines covered (65.25%)

0.65 hits per line

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 passes/shared/src/main/scala/com/ossuminc/riddl/passes/analysis/RootComparison.scala

Coverage Regressions

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Jobs
ID Job ID Ran Files Coverage
1 28683473913.1 140
65.25
Source Files on build 28683473913