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------------------------------------------------------------------------
-- Agda Helium
--
-- Definition of assertions used in correctness triples
------------------------------------------------------------------------
{-# OPTIONS --safe --without-K #-}
open import Helium.Data.Pseudocode.Algebra using (RawPseudocode)
module Helium.Semantics.Axiomatic.Assertion
{b₁ b₂ i₁ i₂ i₃ r₁ r₂ r₃}
(rawPseudocode : RawPseudocode b₁ b₂ i₁ i₂ i₃ r₁ r₂ r₃)
where
open RawPseudocode rawPseudocode
open import Data.Bool as Bool using (Bool)
open import Data.Empty.Polymorphic using (⊥)
open import Data.Fin as Fin using (suc)
open import Data.Fin.Patterns
open import Data.Nat using (ℕ; suc)
import Data.Nat.Properties as ℕₚ
open import Data.Product using (∃; _×_; _,_; proj₁; proj₂)
open import Data.Sum using (_⊎_)
open import Data.Unit.Polymorphic using (⊤)
open import Data.Vec as Vec using (Vec; []; _∷_; _++_)
open import Data.Vec.Relation.Unary.All as All using (All; []; _∷_)
open import Function using (_$_)
open import Helium.Data.Pseudocode.Core
open import Helium.Semantics.Axiomatic.Core rawPseudocode
open import Helium.Semantics.Axiomatic.Term rawPseudocode as Term using (Term)
open import Level using (_⊔_; Lift; lift; lower) renaming (suc to ℓsuc)
private
variable
t t′ : Type
m n o : ℕ
Γ Δ Σ ts : Vec Type m
open Term.Term
data Assertion (Σ : Vec Type o) (Γ : Vec Type n) (Δ : Vec Type m) : Set (ℓsuc (b₁ ⊔ i₁ ⊔ r₁))
data Assertion Σ Γ Δ where
all : Assertion Σ Γ (t ∷ Δ) → Assertion Σ Γ Δ
some : Assertion Σ Γ (t ∷ Δ) → Assertion Σ Γ Δ
pred : Term Σ Γ Δ bool → Assertion Σ Γ Δ
comb : ∀ {n} → (Vec (Set (b₁ ⊔ i₁ ⊔ r₁)) n → Set (b₁ ⊔ i₁ ⊔ r₁)) → Vec (Assertion Σ Γ Δ) n → Assertion Σ Γ Δ
substVars : Assertion Σ Γ Δ → All (Term Σ ts Δ) Γ → Assertion Σ ts Δ
substVars (all P) ts = all (substVars P (Term.wknMeta′ ts))
substVars (some P) ts = some (substVars P (Term.wknMeta′ ts))
substVars (pred p) ts = pred (Term.substVars p ts)
substVars (comb f Ps) ts = comb f (helper Ps ts)
where
helper : ∀ {n m ts} → Vec (Assertion Σ _ Δ) n → All (Term {n = m} Σ ts Δ) Γ → Vec (Assertion Σ ts Δ) n
helper [] ts = []
helper (P ∷ Ps) ts = substVars P ts ∷ helper Ps ts
elimVar : Assertion Σ (t ∷ Γ) Δ → Term Σ Γ Δ t → Assertion Σ Γ Δ
elimVar (all P) t = all (elimVar P (Term.wknMeta t))
elimVar (some P) t = some (elimVar P (Term.wknMeta t))
elimVar (pred p) t = pred (Term.elimVar p t)
elimVar (comb f Ps) t = comb f (helper Ps t)
where
helper : ∀ {n} → Vec (Assertion Σ (_ ∷ Γ) Δ) n → Term Σ Γ Δ _ → Vec (Assertion Σ Γ Δ) n
helper [] t = []
helper (P ∷ Ps) t = elimVar P t ∷ helper Ps t
wknVar : Assertion Σ Γ Δ → Assertion Σ (t ∷ Γ) Δ
wknVar (all P) = all (wknVar P)
wknVar (some P) = some (wknVar P)
wknVar (pred p) = pred (Term.wknVar p)
wknVar (comb f Ps) = comb f (helper Ps)
where
helper : ∀ {n} → Vec (Assertion Σ Γ Δ) n → Vec (Assertion Σ (_ ∷ Γ) Δ) n
helper [] = []
helper (P ∷ Ps) = wknVar P ∷ helper Ps
wknVars : (ts : Vec Type n) → Assertion Σ Γ Δ → Assertion Σ (ts ++ Γ) Δ
wknVars τs (all P) = all (wknVars τs P)
wknVars τs (some P) = some (wknVars τs P)
wknVars τs (pred p) = pred (Term.wknVars τs p)
wknVars τs (comb f Ps) = comb f (helper Ps)
where
helper : ∀ {n} → Vec (Assertion Σ Γ Δ) n → Vec (Assertion Σ (τs ++ Γ) Δ) n
helper [] = []
helper (P ∷ Ps) = wknVars τs P ∷ helper Ps
addVars : Assertion Σ [] Δ → Assertion Σ Γ Δ
addVars (all P) = all (addVars P)
addVars (some P) = some (addVars P)
addVars (pred p) = pred (Term.addVars p)
addVars (comb f Ps) = comb f (helper Ps)
where
helper : ∀ {n} → Vec (Assertion Σ [] Δ) n → Vec (Assertion Σ Γ Δ) n
helper [] = []
helper (P ∷ Ps) = addVars P ∷ helper Ps
wknMetaAt : ∀ i → Assertion Σ Γ Δ → Assertion Σ Γ (Vec.insert Δ i t)
wknMetaAt i (all P) = all (wknMetaAt (suc i) P)
wknMetaAt i (some P) = some (wknMetaAt (suc i) P)
wknMetaAt i (pred p) = pred (Term.wknMetaAt i p)
wknMetaAt i (comb f Ps) = comb f (helper i Ps)
where
helper : ∀ {n} i → Vec (Assertion Σ Γ Δ) n → Vec (Assertion Σ Γ (Vec.insert Δ i _)) n
helper i [] = []
helper i (P ∷ Ps) = wknMetaAt i P ∷ helper i Ps
-- NOTE: better to induct on P instead of ts?
wknMetas : (ts : Vec Type n) → Assertion Σ Γ Δ → Assertion Σ Γ (ts ++ Δ)
wknMetas [] P = P
wknMetas (_ ∷ ts) P = wknMetaAt 0F (wknMetas ts P)
module _ (2≉0 : Term.2≉0) where
-- NOTE: better to induct on e here than in Term?
subst : Assertion Σ Γ Δ → {e : Code.Expression Σ Γ t} → Code.CanAssign Σ e → Term Σ Γ Δ t → Assertion Σ Γ Δ
subst (all P) e t = all (subst P e (Term.wknMeta t))
subst (some P) e t = some (subst P e (Term.wknMeta t))
subst (pred p) e t = pred (Term.subst 2≉0 p e t)
subst (comb f Ps) e t = comb f (helper Ps e t)
where
helper : ∀ {t n} → Vec (Assertion Σ Γ Δ) n → {e : Code.Expression Σ Γ t} → Code.CanAssign Σ e → Term Σ Γ Δ t → Vec (Assertion Σ Γ Δ) n
helper [] e t = []
helper (P ∷ Ps) e t = subst P e t ∷ helper Ps e t
module Construct where
infixl 6 _∧_
infixl 5 _∨_
true : Assertion Σ Γ Δ
true = comb (λ _ → ⊤) []
false : Assertion Σ Γ Δ
false = comb (λ _ → ⊥) []
_∧_ : Assertion Σ Γ Δ → Assertion Σ Γ Δ → Assertion Σ Γ Δ
P ∧ Q = comb (λ { (P ∷ Q ∷ []) → P × Q }) (P ∷ Q ∷ [])
_∨_ : Assertion Σ Γ Δ → Assertion Σ Γ Δ → Assertion Σ Γ Δ
P ∨ Q = comb (λ { (P ∷ Q ∷ []) → P ⊎ Q }) (P ∷ Q ∷ [])
equal : Term Σ Γ Δ t → Term Σ Γ Δ t → Assertion Σ Γ Δ
equal {t = bool} x y = pred Term.[ bool ][ x ≟ y ]
equal {t = int} x y = pred Term.[ int ][ x ≟ y ]
equal {t = fin n} x y = pred Term.[ fin ][ x ≟ y ]
equal {t = real} x y = pred Term.[ real ][ x ≟ y ]
equal {t = bit} x y = pred Term.[ bit ][ x ≟ y ]
equal {t = bits n} x y = pred Term.[ bits ][ x ≟ y ]
equal {t = tuple _ []} x y = true
equal {t = tuple _ (t ∷ ts)} x y = equal {t = t} (Term.func₁ proj₁ x) (Term.func₁ proj₁ y) ∧ equal (Term.func₁ proj₂ x) (Term.func₁ proj₂ y)
equal {t = array t 0} x y = true
equal {t = array t (suc n)} x y = all (equal {t = t} (index x) (index y))
where
index = λ v → Term.unbox (array t) $
Term.func₁ proj₁ $
Term.cut (array t)
(Term.cast (array t) (ℕₚ.+-comm 1 n) (Term.wknMeta v))
(meta 0F)
open Construct public
⟦_⟧ : Assertion Σ Γ Δ → ⟦ Σ ⟧ₜ′ → ⟦ Γ ⟧ₜ′ → ⟦ Δ ⟧ₜ′ → Set (b₁ ⊔ i₁ ⊔ r₁)
⟦_⟧′ : Vec (Assertion Σ Γ Δ) n → ⟦ Σ ⟧ₜ′ → ⟦ Γ ⟧ₜ′ → ⟦ Δ ⟧ₜ′ → Vec (Set (b₁ ⊔ i₁ ⊔ r₁)) n
⟦ all P ⟧ σ γ δ = ∀ x → ⟦ P ⟧ σ γ (x , δ)
⟦ some P ⟧ σ γ δ = ∃ λ x → ⟦ P ⟧ σ γ (x , δ)
⟦ pred p ⟧ σ γ δ = Lift (b₁ ⊔ i₁ ⊔ r₁) (Bool.T (lower (Term.⟦ p ⟧ σ γ δ)))
⟦ comb f Ps ⟧ σ γ δ = f (⟦ Ps ⟧′ σ γ δ)
⟦ [] ⟧′ σ γ δ = []
⟦ P ∷ Ps ⟧′ σ γ δ = ⟦ P ⟧ σ γ δ ∷ ⟦ Ps ⟧′ σ γ δ
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