def digits_view.go

lawful-fields@0.1.1.0 · PROOF.bend:91

import Base
import lawful-bytes@0.1.1.0/defs.bend as D
import lawful-fields@0.1.1.0/defs.bend as F
import lawful-fields@0.1.1.0/fields.bend as C
import lawful-bytes@0.1.1.0/proof_core.bend as BC
import lawful-fields@0.1.1.0/proof_digits.bend as DG

91def digits_view.go(-b: D.Bytes, +d: Nat, +from: U32, +to: U32, h: {D.ok(b, d) == True{} : Bool}, hft: {U32.is_le(from, to) == True{} : Bool}, ht: {Nat.is_le(U32.to_nat(to), D.size(b)) == True{} : Bool}, m_b: BC.BMirror(b)) ->
92  {Pair.snd(D.Bytes, Bool, C.digits(b, from, to)) == F.all_digits(D.slice(D.view(b), U32.to_nat(from), Nat.sub(U32.to_nat(to), U32.to_nat(from)))) : Bool}:
93  (+l_b, m2_b) = m_b
94  (+t_b, +e_b) = m2_b
95  %e_b : {Pair.snd(D.Bytes, Bool, C.digits(_, from, to)) == F.all_digits(D.slice(D.view(_), U32.to_nat(from), Nat.sub(U32.to_nat(to), U32.to_nat(from)))) : Bool}
96  +h_t = BC.tr(x => {D.ok(x, d) == True{} : Bool}, b, l_b, t_b, e_b, h)
97  +ht_t = BC.tr(x => {Nat.is_le(U32.to_nat(to), D.size(x)) == True{} : Bool}, b, l_b, t_b, e_b, ht)
98  DG.digits_view_t(l_b, t_b, d, from, to, h_t, hft, ht_t)