112 lines
2.7 KiB
Text
112 lines
2.7 KiB
Text
/-
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Copyright (c) 2014 Microsoft Corporation. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Authors: Leonardo de Moura
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Basic datatypes
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-/
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prelude
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notation `Prop` := Type.{0}
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notation [parsing-only] `Type'` := Type.{_+1}
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notation [parsing-only] `Type₊` := Type.{_+1}
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notation `Type₁` := Type.{1}
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notation `Type₂` := Type.{2}
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notation `Type₃` := Type.{3}
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set_option structure.eta_thm true
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set_option structure.proj_mk_thm true
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inductive unit.{l} : Type.{l} :=
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star : unit
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inductive true : Prop :=
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intro : true
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inductive false : Prop
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inductive empty : Type
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inductive eq {A : Type} (a : A) : A → Prop :=
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refl : eq a a
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inductive heq {A : Type} (a : A) : Π {B : Type}, B → Prop :=
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refl : heq a a
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structure prod (A B : Type) :=
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mk :: (pr1 : A) (pr2 : B)
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inductive and (a b : Prop) : Prop :=
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intro : a → b → and a b
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definition and.elim_left {a b : Prop} (H : and a b) : a :=
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and.rec (λa b, a) H
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definition and.left := @and.elim_left
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definition and.elim_right {a b : Prop} (H : and a b) : b :=
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and.rec (λa b, b) H
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definition and.right := @and.elim_right
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inductive sum (A B : Type) : Type :=
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inl {} : A → sum A B,
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inr {} : B → sum A B
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definition sum.intro_left [reducible] {A : Type} (B : Type) (a : A) : sum A B :=
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sum.inl a
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definition sum.intro_right [reducible] (A : Type) {B : Type} (b : B) : sum A B :=
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sum.inr b
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inductive or (a b : Prop) : Prop :=
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inl {} : a → or a b,
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inr {} : b → or a b
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definition or.intro_left {a : Prop} (b : Prop) (Ha : a) : or a b :=
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or.inl Ha
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definition or.intro_right (a : Prop) {b : Prop} (Hb : b) : or a b :=
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or.inr Hb
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-- pos_num and num are two auxiliary datatypes used when parsing numerals such as 13, 0, 26.
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-- The parser will generate the terms (pos (bit1 (bit1 (bit0 one)))), zero, and (pos (bit0 (bit1 (bit1 one)))).
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-- This representation can be coerced in whatever we want (e.g., naturals, integers, reals, etc).
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inductive pos_num : Type :=
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one : pos_num,
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bit1 : pos_num → pos_num,
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bit0 : pos_num → pos_num
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namespace pos_num
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definition succ (a : pos_num) : pos_num :=
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rec_on a (bit0 one) (λn r, bit0 r) (λn r, bit1 n)
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end pos_num
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inductive num : Type :=
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zero : num,
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pos : pos_num → num
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namespace num
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open pos_num
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definition succ (a : num) : num :=
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rec_on a (pos one) (λp, pos (succ p))
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end num
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inductive bool : Type :=
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ff : bool,
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tt : bool
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inductive char : Type :=
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mk : bool → bool → bool → bool → bool → bool → bool → bool → char
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inductive string : Type :=
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empty : string,
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str : char → string → string
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inductive nat :=
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zero : nat,
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succ : nat → nat
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inductive option (A : Type) : Type :=
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none {} : option A,
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some : A → option A
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