80 lines
3.4 KiB
Lua
80 lines
3.4 KiB
Lua
function display_type(env, t)
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print(tostring(t) .. " : " .. tostring(env:normalize(env:type_check(t))))
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end
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local env = environment()
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local nat = Const("nat")
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local zero = Const("zero")
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local succ = Const("succ")
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env = add_inductive(env,
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"nat", Type,
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"zero", nat,
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"succ", mk_arrow(nat, nat))
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local a = Local("a", nat)
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local b = Local("b", nat)
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local n = Local("n", nat)
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local r = Local("r", nat)
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local nat_rec_nat = Const("nat_rec", {1})(Fun(a, nat))
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local add = Fun(a, b, nat_rec_nat(b, Fun(n, r, succ(r)), a))
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local tc = type_checker(env)
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assert(tc:is_def_eq(add(succ(succ(zero)), succ(zero)),
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succ(succ(succ(zero)))))
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print(env:normalize(add(succ(succ(zero)), succ(succ(succ(zero))))))
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local l = param_univ("l")
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local U_l = mk_sort(l)
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local U_l1 = mk_sort(max_univ(l, 1))
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local tree_l = Const("tree", {l})
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local tree_list_l = Const("tree_list", {l})
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local A = Local("A", U_l)
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local v = Local("v", A)
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local children = Local("children", tree_list_l(A))
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local head = Local("head", tree_l(A))
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local tail = Local("tail", tree_list_l(A))
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env = add_inductive(env, {l}, 1,
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{"tree", Pi(A, U_l1),
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"leaf", Pi(A, tree_l(A)),
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"node", Pi(A, v, children, tree_l(A))
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},
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{"tree_list", Pi(A, U_l1),
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"nil", Pi(A, tree_list_l(A)),
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"cons", Pi(A, head, tail, tree_list_l(A))})
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local tree_nat = Const("tree", {1})(nat)
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local tree_list_nat = Const("tree_list", {1})(nat)
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local t = Local("t", tree_nat)
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local tl = Local("tl", tree_list_nat)
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local tree_rec_nat = Const("tree_rec", {1, 1})(nat, Fun(t, nat), Fun(tl, nat))
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local r1 = Local("r1", nat)
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local r2 = Local("r2", nat)
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local length_tree_nat = Fun(t, tree_rec_nat(zero,
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Fun(a, tl, r, succ(r)),
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zero,
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Fun(t, tl, r1, r2, add(r1, r2)),
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t))
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display_type(env, length_tree_nat)
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local leaf_nat = Const("leaf", {1})(nat)
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local node_nat = Const("node", {1})(nat)
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local nil_nat = Const("nil", {1})(nat)
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local cons_nat = Const("cons", {1})(nat)
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local one = succ(zero)
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local two = succ(one)
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local tree1 = node_nat(one, nil_nat)
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local tree2 = node_nat(two, cons_nat(leaf_nat, cons_nat(leaf_nat, nil_nat)))
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local tree3 = node_nat(one, cons_nat(tree1, cons_nat(tree2, nil_nat)))
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local tree4 = node_nat(one, cons_nat(tree3, cons_nat(tree3, nil_nat)))
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display_type(env, tree4)
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print("norm(tree1): " .. tostring(env:normalize(length_tree_nat(tree1))))
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print("norm(tree2): " .. tostring(env:normalize(length_tree_nat(tree2))))
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print("norm(tree3): " .. tostring(env:normalize(length_tree_nat(tree3))))
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print("norm(tree4): " .. tostring(env:normalize(length_tree_nat(tree4))))
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assert(env:normalize(length_tree_nat(tree1)) == succ(zero))
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assert(env:normalize(length_tree_nat(tree2)) == succ(zero))
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assert(env:normalize(length_tree_nat(tree3)) == succ(succ(succ(zero))))
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assert(env:normalize(length_tree_nat(tree4)) == succ(succ(succ(succ(succ(succ(succ(zero))))))))
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