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Clone detection analyzer reference

The clone detection analyzer finds duplicate and near-duplicate functions across your entire codebase using MinHash signatures and Locality-Sensitive Hashing (LSH). It operates on the UAST representation and detects clones cross-file — not just within a single file.

For the conceptual model — the clone-type taxonomy, the methodology, and why MinHash + LSH — see Understanding clone detection. To run it, see the Quick start.

Configuration options

The clone detection analyzer uses the UAST directly and has no analyzer-specific configuration options.

Option Type Default Description
(none) -- -- Uses UAST; no analyzer-specific config

Example output

+----------------------------------------------+
|              CLONE DETECTION                  |
|               Score: 7/10                     |
|  Low duplication - few clone pairs detected   |
+----------------------------------------------+

Key Metrics
  Total Functions ....... 346
  Clone Pairs ........... 12
  Clone Ratio ........... 0.03

Distribution
  Type-1 (Exact) ....... 17%  (2)
  Type-2 (Renamed) ..... 50%  (6)
  Type-3 (Near-miss) ... 33%  (4)

Issues (sorted worst-first)
  pkg/a.go::Handler <-> pkg/b.go::Handler   Type-1   1.00
  cmd/run.go::Execute <-> cmd/serve.go::Execute   Type-2   0.92

{
  "total_functions": 346,
  "total_clone_pairs": 12,
  "clone_ratio": 0.035,
  "clone_pairs": [
    {
      "func_a": "pkg/a.go::Handler",
      "func_b": "pkg/b.go::Handler",
      "similarity": 1.0,
      "clone_type": "Type-1"
    },
    {
      "func_a": "cmd/run.go::Execute",
      "func_b": "cmd/serve.go::Execute",
      "similarity": 0.92,
      "clone_type": "Type-2"
    }
  ],
  "message": "Low duplication - few clone pairs detected"
}

The HTML plot output includes a Clone Type Distribution pie chart showing the breakdown of detected clones by type (Type-1, Type-2, Type-3).

See also