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{-# OPTIONS --without-K --safe #-}
open import Relation.Binary as B using (Setoid)
module Cfe.Language.Indexed.Homogeneous
{c ℓ} (over : Setoid c ℓ)
where
open import Cfe.Language over
open import Level
open import Data.List
open import Data.Product
open import Relation.Binary.Indexed.Heterogeneous
open _≈_
open Setoid over using () renaming (Carrier to C)
record IndexedLanguage i iℓ a aℓ : Set (ℓ ⊔ suc (c ⊔ i ⊔ iℓ ⊔ a ⊔ aℓ)) where
field
Carrierᵢ : Set i
_≈ᵢ_ : B.Rel Carrierᵢ iℓ
isEquivalenceᵢ : B.IsEquivalence _≈ᵢ_
F : Carrierᵢ → Language a aℓ
cong : F B.Preserves _≈ᵢ_ ⟶ _≈_
open B.IsEquivalence isEquivalenceᵢ using () renaming (refl to reflᵢ; sym to symᵢ; trans to transᵢ) public
Tagged : List C → Set (i ⊔ a)
Tagged l = ∃[ i ] l ∈ F i
_≈ᵗ_ : IRel Tagged (iℓ ⊔ aℓ)
_≈ᵗ_ (i , l∈Fi) (j , m∈Fj) = Σ (i ≈ᵢ j) λ i≈j → ≈ᴸ (F j) (f (cong i≈j) l∈Fi) m∈Fj
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