27 lines
779 B
Idris
27 lines
779 B
Idris
module Quox.Thin.Cover
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import public Quox.Thin.Base
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import public Quox.Thin.List
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%default total
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||| an OPE list is a cover if at least one of the OPEs has `Keep` as the head,
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||| and the tails are also a cover
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||| in @egtbs it is a binary relation which is fine for ×ᵣ but i don't want to
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||| write my AST in universe-of-syntaxes style. sorry
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public export data Cover : OPEList n -> Type
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||| the "`Keep` in the head" condition of a cover
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public export data Cover1 : OPEList n -> Type
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data Cover where
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Nil : Cover opes {n = 0}
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(::) : Cover1 opes -> All2 IsTail opes tails => Cover tails -> Cover opes
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%name Cover cov
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data Cover1 where
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Here : Cover1 (Keep ope eq :: opes)
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There : Cover1 opes -> Cover1 (ope :: opes)
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%name Cover1 cov1
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%builtin Natural Cover1
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