[Utils] Add token-based duplicate code detector with CI gate - #8482
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Adds utils/duplicates, a minimal phpcpd clone (token_get_all + Rabin-Karp), a plain PHP bin script, unit tests, and a Duplicated Code CI job that fails when a copy-pasted block >= 400 tokens is added.
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Adds
utils/duplicates, a minimal phpcpd clone, plus a CI gate.How it works
token_get_all()(no php-parser dependency).--min-tokenswindow, filtered by--min-lines.Usage
Options:
--min-lines(default 5),--min-tokens(default 70),--fuzzy. Exit code is 1 when clones are found.CI
A
Duplicated Codeworkflow runscomposer duplicated-codeand fails when a copy-pasted block >= 400 tokens is added. 400 is the clean floor on currentmain; once the rule de-duplication in #8486 lands, this can be tightened to 150.Covered by
CloneDetectorTest.