154 lines
5.4 KiB
Text
154 lines
5.4 KiB
Text
/-
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Copyright (c) 2018 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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Author: Leonardo de Moura
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-/
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prelude
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import init.control.except init.control.reader init.control.state
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universes u v
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namespace lean
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inductive format
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| nil : format
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| line : format
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| text : string → format
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| nest : nat → format → format
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| compose : bool → format → format → format
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| choice : format → format → format
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namespace format
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instance : hasAppend format := ⟨compose ff⟩
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instance : hasCoe string format := ⟨text⟩
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def join (xs : list format) : format :=
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xs.foldl (++) ""
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def flatten : format → format
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| nil := nil
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| line := text " "
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| f@(text _) := f
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| (nest _ f) := flatten f
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| (choice f _) := flatten f
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| f@(compose tt _ _) := f
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| f@(compose ff f₁ f₂) := compose tt (flatten f₁) (flatten f₂)
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def group : format → format
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| nil := nil
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| f@(text _) := f
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| f@(compose tt _ _) := f
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| f := choice (flatten f) f
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structure spaceResult :=
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(found := ff)
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(exceeded := ff)
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(space := 0)
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/-
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TODO: mark as `@[inline]` as soon as we fix the code inliner.
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-/
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private def merge (w : nat) (r₁ : spaceResult) (r₂ : thunk spaceResult) : spaceResult :=
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if r₁.exceeded || r₁.found then r₁
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else let y := r₂.get in
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if y.exceeded || y.found then y
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else let newSpace := r₁.space + y.space in
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{ space := newSpace, exceeded := newSpace > w }
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def spaceUptoLine : format → nat → spaceResult
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| nil w := {}
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| line w := { found := tt }
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| (text s) w := { space := s.length, exceeded := s.length > w }
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| (compose _ f₁ f₂) w := merge w (spaceUptoLine f₁ w) (spaceUptoLine f₂ w)
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| (nest _ f) w := spaceUptoLine f w
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| (choice f₁ f₂) w := spaceUptoLine f₂ w
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def spaceUptoLine' : list (nat × format) → nat → spaceResult
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| [] w := {}
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| (p::ps) w := merge w (spaceUptoLine p.2 w) (spaceUptoLine' ps w)
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def be : nat → nat → string → list (nat × format) → string
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| w k out [] := out
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| w k out ((i, nil)::z) := be w k out z
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| w k out ((i, (compose _ f₁ f₂))::z) := be w k out ((i, f₁)::(i, f₂)::z)
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| w k out ((i, (nest n f))::z) := be w k out ((i+n, f)::z)
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| w k out ((i, text s)::z) := be w (k + s.length) (out ++ s) z
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| w k out ((i, line)::z) := be w i ((out ++ "\n").pushn ' ' i) z
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| w k out ((i, choice f₁ f₂)::z) :=
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let r := merge w (spaceUptoLine f₁ w) (spaceUptoLine' z w) in
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if r.exceeded then be w k out ((i, f₂)::z) else be w k out ((i, f₁)::z)
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def pretty (f : format) (w : nat := 80) : string :=
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be w 0 "" [(0, f)]
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@[inline] def bracket (l : string) (f : format) (r : string) : format :=
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group (nest l.length $ l ++ f ++ r)
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@[inline] def paren (f : format) : format :=
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bracket "(" f ")"
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@[inline] def sbracket (f : format) : format :=
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bracket "[" f "]"
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end format
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open lean.format
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class hasToFormat (α : Type u) :=
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(toFormat : α → format)
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export lean.hasToFormat (toFormat)
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def toFmt {α : Type u} [hasToFormat α] : α → format :=
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toFormat
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instance toStringToFormat {α : Type u} [hasToString α] : hasToFormat α :=
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⟨text ∘ toString⟩
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-- note: must take precendence over the above instance to avoid premature formatting
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instance formatHasToFormat : hasToFormat format :=
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⟨id⟩
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instance stringHasToFormat : hasToFormat string := ⟨format.text⟩
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def format.joinSep {α : Type u} [hasToFormat α] : list α → format → format
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| [] sep := nil
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| [a] sep := toFmt a
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| (a::as) sep := toFmt a ++ sep ++ format.joinSep as sep
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def format.prefixJoin {α : Type u} [hasToFormat α] (pre : format) : list α → format
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| [] := nil
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| (a::as) := pre ++ toFmt a ++ format.prefixJoin as
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def format.joinSuffix {α : Type u} [hasToFormat α] : list α → format → format
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| [] suffix := nil
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| (a::as) suffix := toFmt a ++ suffix ++ format.joinSuffix as suffix
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def list.toFormat {α : Type u} [hasToFormat α] : list α → format
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| [] := "[]"
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| xs := sbracket $ format.joinSep xs ("," ++ line)
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instance listHasToFormat {α : Type u} [hasToFormat α] : hasToFormat (list α) :=
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⟨list.toFormat⟩
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instance prodHasToFormat {α : Type u} {β : Type v} [hasToFormat α] [hasToFormat β] : hasToFormat (prod α β) :=
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⟨λ ⟨a, b⟩, paren $ toFormat a ++ "," ++ line ++ toFormat b⟩
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instance natHasToFormat : hasToFormat nat := ⟨λ n, toString n⟩
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instance uint16HasToFormat : hasToFormat uint16 := ⟨λ n, toString n⟩
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instance uint32HasToFormat : hasToFormat uint32 := ⟨λ n, toString n⟩
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instance uint64HasToFormat : hasToFormat uint64 := ⟨λ n, toString n⟩
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instance usizeHasToFormat : hasToFormat usize := ⟨λ n, toString n⟩
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instance formatHasToString : hasToString format := ⟨pretty⟩
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protected def format.repr : format → format
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| nil := "format.nil"
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| line := "format.line"
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| (text s) := paren $ "format.text" ++ line ++ repr s
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| (nest n f) := paren $ "format.nest" ++ line ++ repr n ++ line ++ format.repr f
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| (compose b f₁ f₂) := paren $ "format.compose " ++ repr b ++ line ++ format.repr f₁ ++ line ++ format.repr f₂
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| (choice f₁ f₂) := paren $ "format.choice" ++ line ++ format.repr f₁ ++ line ++ format.repr f₂
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instance : hasRepr format := ⟨format.pretty ∘ format.repr⟩
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end lean
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