4264f5f36f
Add swap + legality to the board model: - swap(board, a, b): in-place, self-inverse cell exchange (trial then revert). - adjacent(a, b): orthogonal-adjacency predicate (diagonal/gap = false). - swap_legal(board, a, b): legal iff adjacent AND, after the trial swap, either swapped cell participates in a 3+ match (reuses find_matches); leaves the board unchanged. Non-adjacent/diagonal rejected before any match check. - Cell/Swap structs + legal_swaps(board): all currently-legal swaps in a stable row-major, right-before-down order; dump_swaps for deterministic snapshotting. tests/swap_legality.sx asserts the predicate over hand-crafted boards (legal 3-run, no-match, non-adjacent, diagonal, only-the-other-gem-matches) and the non-mutating revert; locks legal_swaps over the seeded board as a golden.
57 lines
666 B
Plaintext
57 lines
666 B
Plaintext
== swap & legality ==
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== swap revert (non-mutating) ==
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before:
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OGOGOGOG
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GOGOGOGO
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OGOGOGOG
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RRBRGOGO
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OGOGOGOG
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GOGOGOGO
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OGOGOGOG
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GOGOGOGO
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after:
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OGOGOGOG
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GOGOGOGO
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OGOGOGOG
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RRBRGOGO
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OGOGOGOG
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GOGOGOGO
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OGOGOGOG
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GOGOGOGO
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== legal_swaps: seeded 1337 ==
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RRPPOGRG
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PGPOPRRO
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YYBBYRYB
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GBYYRGGP
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OGBRRORY
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BYRRPRBG
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YOYYROBB
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OROBPPRB
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--
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24 legal swaps
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(3,0)-(3,1)
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(4,0)-(4,1)
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(5,0)-(6,0)
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(1,2)-(1,3)
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(2,2)-(2,3)
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(4,2)-(5,2)
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(4,2)-(4,3)
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(5,2)-(6,2)
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(1,3)-(2,3)
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(3,3)-(4,3)
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(4,3)-(5,3)
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(2,4)-(2,5)
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(4,4)-(4,5)
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(5,4)-(6,4)
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(5,4)-(5,5)
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(1,5)-(1,6)
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(3,5)-(4,5)
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(4,5)-(5,5)
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(4,5)-(4,6)
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(6,5)-(7,5)
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(0,6)-(1,6)
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(1,6)-(1,7)
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(3,6)-(4,6)
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(6,7)-(7,7)
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ok: swap legality over hand-crafted boards
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