140 lines
4.6 KiB
Text
140 lines
4.6 KiB
Text
/-
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Copyright (c) 2016 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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-/
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prelude
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import init.meta.options
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universe variables u v
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inductive format.color
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| red | green | orange | blue | pink | cyan | grey
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meta constant format : Type 1
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meta constant format.line : format
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meta constant format.space : format
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meta constant format.nil : format
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meta constant format.compose : format → format → format
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meta constant format.nest : nat → format → format
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meta constant format.highlight : format → color → format
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meta constant format.group : format → format
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meta constant format.of_string : string → format
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meta constant format.of_nat : nat → format
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meta constant format.flatten : format → format
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meta constant format.to_string : format → options → string
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meta constant format.of_options : options → format
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meta constant format.is_nil : format → bool
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meta constant trace_fmt {A : Type u} : format → (unit → A) → A
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meta instance : inhabited format :=
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⟨format.space⟩
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meta instance : has_append format :=
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⟨format.compose⟩
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meta instance : has_to_string format :=
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⟨λ f, format.to_string f options.mk⟩
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meta class has_to_format (A : Type u) :=
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(to_format : A → format)
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meta instance : has_to_format format :=
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⟨id⟩
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meta def to_fmt {A : Type u} [has_to_format A] : A → format :=
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has_to_format.to_format
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meta instance nat_to_format : has_coe nat format :=
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⟨format.of_nat⟩
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meta instance string_to_format : has_coe string format :=
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⟨format.of_string⟩
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open format list
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meta def format.indent (f : format) (n : nat) : format :=
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nest n (line ++ f)
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meta def format.when {A : Type u} [has_to_format A] : bool → A → format
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| tt a := to_fmt a
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| ff a := nil
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meta instance : has_to_format options :=
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⟨λ o, format.of_options o⟩
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meta instance : has_to_format bool :=
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⟨λ b, if b then of_string "tt" else of_string "ff"⟩
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meta instance {p : Prop} : has_to_format (decidable p) :=
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⟨λ b : decidable p, @ite p b _ (of_string "tt") (of_string "ff")⟩
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meta instance : has_to_format string :=
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⟨λ s, format.of_string s⟩
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meta instance : has_to_format nat :=
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⟨λ n, format.of_nat n⟩
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meta instance : has_to_format char :=
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⟨λ c : char, format.of_string [c]⟩
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meta def list.to_format_aux {A : Type u} [has_to_format A] : bool → list A → format
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| b [] := to_fmt ""
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| tt (x::xs) := to_fmt x ++ list.to_format_aux ff xs
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| ff (x::xs) := to_fmt "," ++ line ++ to_fmt x ++ list.to_format_aux ff xs
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meta def list.to_format {A : Type u} [has_to_format A] : list A → format
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| [] := to_fmt "[]"
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| (x::xs) := to_fmt "[" ++ group (nest 1 (list.to_format_aux tt (x::xs))) ++ to_fmt "]"
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meta instance {A : Type u} [has_to_format A] : has_to_format (list A) :=
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⟨list.to_format⟩
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attribute [instance] string.has_to_format
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meta instance : has_to_format name :=
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⟨λ n, to_fmt (to_string n)⟩
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meta instance : has_to_format unit :=
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⟨λ u, to_fmt "()"⟩
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meta instance {A : Type u} [has_to_format A] : has_to_format (option A) :=
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⟨λ o, option.cases_on o
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(to_fmt "none")
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(λ a, to_fmt "(some " ++ nest 6 (to_fmt a) ++ to_fmt ")")⟩
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meta instance {A : Type u} {B : Type v} [has_to_format A] [has_to_format B] : has_to_format (sum A B) :=
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⟨λ s, sum.cases_on s
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(λ a, to_fmt "(inl " ++ nest 5 (to_fmt a) ++ to_fmt ")")
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(λ b, to_fmt "(inr " ++ nest 5 (to_fmt b) ++ to_fmt ")")⟩
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open prod
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meta instance {A : Type u} {B : Type v} [has_to_format A] [has_to_format B] : has_to_format (prod A B) :=
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⟨λ p, group (nest 1 (to_fmt "(" ++ to_fmt (fst p) ++ to_fmt "," ++ line ++ to_fmt (snd p) ++ to_fmt ")"))⟩
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open sigma
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meta instance {A : Type u} {B : A → Type v} [has_to_format A] [s : ∀ x, has_to_format (B x)]
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: has_to_format (sigma B) :=
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⟨λ p, group (nest 1 (to_fmt "⟨" ++ to_fmt (fst p) ++ to_fmt "," ++ line ++ to_fmt (snd p) ++ to_fmt "⟩"))⟩
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open subtype
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meta instance {A : Type u} {P : A → Prop} [has_to_format A] : has_to_format (subtype P) :=
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⟨λ s, to_fmt (elt_of s)⟩
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meta def format.bracket : string → string → format → format
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| o c f := to_fmt o ++ nest (utf8_length o) f ++ to_fmt c
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meta def format.paren (f : format) : format :=
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format.bracket "(" ")" f
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meta def format.cbrace (f : format) : format :=
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format.bracket "{" "}" f
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meta def format.sbracket (f : format) : format :=
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format.bracket "[" "]" f
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meta def format.dcbrace (f : format) : format :=
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to_fmt "⦃" ++ nest 1 f ++ to_fmt "⦄"
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