530 lines
18 KiB
Text
530 lines
18 KiB
Text
/-
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Copyright (c) 2019 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: Sebastian Ullrich, Leonardo de Moura
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-/
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prelude
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import Init.Data.Array
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import Init.Lean.Data.Name
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import Init.Lean.Data.Format
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namespace Lean
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namespace SourceInfo
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def updateTrailing (info : SourceInfo) (trailing : Substring) : SourceInfo :=
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{ trailing := trailing, .. info }
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def truncateTrailing (info : SourceInfo) : SourceInfo :=
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{ trailing := { stopPos := info.trailing.startPos, .. info.trailing }, .. info }
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/- Update `info₁.trailing.stopPos` to `info₂.trailing.stopPos` -/
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def appendToTrailing (info₁ info₂ : SourceInfo) : SourceInfo :=
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{ trailing := { stopPos := info₂.trailing.stopPos, .. info₁.trailing }, .. info₁ }
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/- Update `info₁.leading.startPos` to `info₂.leading.startPos` -/
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def appendToLeading (info₁ info₂ : SourceInfo) : SourceInfo :=
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{ leading := { startPos := info₂.leading.startPos, .. info₁.leading }, .. info₁ }
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end SourceInfo
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/- Node kind generation -/
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@[matchPattern] def choiceKind : SyntaxNodeKind := `choice
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@[matchPattern] def nullKind : SyntaxNodeKind := `null
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def strLitKind : SyntaxNodeKind := `strLit
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def charLitKind : SyntaxNodeKind := `charLit
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def numLitKind : SyntaxNodeKind := `numLit
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def fieldIdxKind : SyntaxNodeKind := `fieldIdx
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/- Syntax AST -/
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def Syntax.isMissing : Syntax → Bool
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| Syntax.missing => true
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| _ => false
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inductive IsNode : Syntax → Prop
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| mk (kind : SyntaxNodeKind) (args : Array Syntax) : IsNode (Syntax.node kind args)
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def SyntaxNode : Type := {s : Syntax // IsNode s }
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def unreachIsNodeMissing {β} (h : IsNode Syntax.missing) : β := False.elim (nomatch h)
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def unreachIsNodeAtom {β} {info val} (h : IsNode (Syntax.atom info val)) : β := False.elim (nomatch h)
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def unreachIsNodeIdent {β info rawVal val preresolved} (h : IsNode (Syntax.ident info rawVal val preresolved)) : β := False.elim (nomatch h)
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namespace SyntaxNode
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@[inline] def getKind (n : SyntaxNode) : SyntaxNodeKind :=
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match n with
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| ⟨Syntax.node k args, _⟩ => k
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| ⟨Syntax.missing, h⟩ => unreachIsNodeMissing h
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| ⟨Syntax.atom _ _, h⟩ => unreachIsNodeAtom h
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| ⟨Syntax.ident _ _ _ _, h⟩ => unreachIsNodeIdent h
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@[inline] def withArgs {β} (n : SyntaxNode) (fn : Array Syntax → β) : β :=
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match n with
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| ⟨Syntax.node _ args, _⟩ => fn args
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| ⟨Syntax.missing, h⟩ => unreachIsNodeMissing h
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| ⟨Syntax.atom _ _, h⟩ => unreachIsNodeAtom h
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| ⟨Syntax.ident _ _ _ _, h⟩ => unreachIsNodeIdent h
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@[inline] def getNumArgs (n : SyntaxNode) : Nat :=
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withArgs n $ fun args => args.size
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@[inline] def getArg (n : SyntaxNode) (i : Nat) : Syntax :=
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withArgs n $ fun args => args.get! i
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@[inline] def getArgs (n : SyntaxNode) : Array Syntax :=
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withArgs n $ fun args => args
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@[inline] def modifyArgs (n : SyntaxNode) (fn : Array Syntax → Array Syntax) : Syntax :=
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match n with
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| ⟨Syntax.node kind args, _⟩ => Syntax.node kind (fn args)
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| ⟨Syntax.missing, h⟩ => unreachIsNodeMissing h
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| ⟨Syntax.atom _ _, h⟩ => unreachIsNodeAtom h
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| ⟨Syntax.ident _ _ _ _, h⟩ => unreachIsNodeIdent h
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end SyntaxNode
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namespace Syntax
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def setAtomVal : Syntax → String → Syntax
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| atom info _, v => (atom info v)
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| stx, _ => stx
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@[inline] def ifNode {β} (stx : Syntax) (hyes : SyntaxNode → β) (hno : Unit → β) : β :=
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match stx with
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| Syntax.node k args => hyes ⟨Syntax.node k args, IsNode.mk k args⟩
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| _ => hno ()
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@[inline] def ifNodeKind {β} (stx : Syntax) (kind : SyntaxNodeKind) (hyes : SyntaxNode → β) (hno : Unit → β) : β :=
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match stx with
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| Syntax.node k args => if k == kind then hyes ⟨Syntax.node k args, IsNode.mk k args⟩ else hno ()
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| _ => hno ()
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def isAtom : Syntax → Bool
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| atom _ _ => true
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| _ => false
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def isIdent : Syntax → Bool
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| ident _ _ _ _ => true
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| _ => false
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def getId : Syntax → Name
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| ident _ _ val _ => val
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| _ => Name.anonymous
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def asNode : Syntax → SyntaxNode
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| Syntax.node kind args => ⟨Syntax.node kind args, IsNode.mk kind args⟩
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| _ => ⟨Syntax.node nullKind #[], IsNode.mk nullKind #[]⟩
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def getNumArgs (stx : Syntax) : Nat :=
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stx.asNode.getNumArgs
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def setArgs (stx : Syntax) (args : Array Syntax) : Syntax :=
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match stx with
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| node k _ => node k args
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| stx => stx
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@[inline] def modifyArgs (stx : Syntax) (fn : Array Syntax → Array Syntax) : Syntax :=
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match stx with
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| node k args => node k (fn args)
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| stx => stx
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def setArg (stx : Syntax) (i : Nat) (arg : Syntax) : Syntax :=
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match stx with
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| node k args => node k (args.set! i arg)
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| stx => stx
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@[inline] def modifyArg (stx : Syntax) (i : Nat) (fn : Syntax → Syntax) : Syntax :=
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match stx with
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| node k args => node k (args.modify i fn)
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| stx => stx
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def getIdAt (stx : Syntax) (i : Nat) : Name :=
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(stx.getArg i).getId
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@[specialize] partial def mreplace {m : Type → Type} [Monad m] (fn : Syntax → m (Option Syntax)) : Syntax → m (Syntax)
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| stx@(node kind args) => do
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o ← fn stx;
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match o with
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| some stx => pure stx
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| none => do args ← args.mapM mreplace; pure (node kind args)
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| stx => do o ← fn stx; pure $ o.getD stx
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@[specialize] partial def mrewriteBottomUp {m : Type → Type} [Monad m] (fn : Syntax → m (Syntax)) : Syntax → m (Syntax)
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| node kind args => do
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args ← args.mapM mrewriteBottomUp;
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fn (node kind args)
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| stx => fn stx
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@[inline] def rewriteBottomUp (fn : Syntax → Syntax) (stx : Syntax) : Syntax :=
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Id.run $ stx.mrewriteBottomUp fn
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private def updateInfo : SourceInfo → String.Pos → SourceInfo
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| {leading := {str := s, startPos := _, stopPos := _}, pos := pos, trailing := trailing}, last =>
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{leading := {str := s, startPos := last, stopPos := pos}, pos := pos, trailing := trailing}
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/- Remark: the State `String.Pos` is the `SourceInfo.trailing.stopPos` of the previous token,
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or the beginning of the String. -/
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@[inline]
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private def updateLeadingAux : Syntax → StateM String.Pos (Option Syntax)
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| atom (some info) val => do
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last ← get;
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set info.trailing.stopPos;
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let newInfo := updateInfo info last;
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pure $ some (atom (some newInfo) val)
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| ident (some info) rawVal val pre => do
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last ← get;
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set info.trailing.stopPos;
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let newInfo := updateInfo info last;
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pure $ some (ident (some newInfo) rawVal val pre)
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| _ => pure none
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/-- Set `SourceInfo.leading` according to the trailing stop of the preceding token.
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The Result is a round-tripping Syntax tree IF, in the input Syntax tree,
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* all leading stops, atom contents, and trailing starts are correct
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* trailing stops are between the trailing start and the next leading stop.
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Remark: after parsing all `SourceInfo.leading` fields are Empty.
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The Syntax argument is the output produced by the Parser for `source`.
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This Function "fixes" the `source.leanding` field.
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Note that, the `SourceInfo.trailing` fields are correct.
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The implementation of this Function relies on this property. -/
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def updateLeading : Syntax → Syntax :=
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fun stx => (mreplace updateLeadingAux stx).run' 0
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partial def updateTrailing (trailing : Substring) : Syntax → Syntax
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| Syntax.atom (some info) val => Syntax.atom (some (info.updateTrailing trailing)) val
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| Syntax.ident (some info) rawVal val pre => Syntax.ident (some (info.updateTrailing trailing)) rawVal val pre
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| n@(Syntax.node k args) =>
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if args.size == 0 then n
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else
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let i := args.size - 1;
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let last := updateTrailing (args.get! i);
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let args := args.set! i last;
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Syntax.node k args
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| s => s
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/-- Retrieve the left-most leaf's info in the Syntax tree. -/
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partial def getHeadInfo : Syntax → Option SourceInfo
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| atom info _ => info
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| ident info _ _ _ => info
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| node _ args => args.find? getHeadInfo
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| _ => none
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def getPos (stx : Syntax) : Option String.Pos :=
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SourceInfo.pos <$> stx.getHeadInfo
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partial def getTailWithInfo : Syntax → Option Syntax
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| stx@(atom (some _) _) => some stx
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| stx@(ident (some _) _ _ _) => some stx
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| node _ args => args.findRev? getTailWithInfo
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| _ => none
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partial def getTailInfo : Syntax → Option SourceInfo
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| atom info _ => info
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| ident info _ _ _ => info
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| node _ args => args.findRev? getTailInfo
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| _ => none
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@[specialize] private partial def updateLast {α} [Inhabited α] (a : Array α) (f : α → Option α) : Nat → Option (Array α)
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| i =>
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if i == 0 then none
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else
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let i := i - 1;
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let v := a.get! i;
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match f v with
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| some v => some $ a.set! i v
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| none => updateLast i
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partial def setTailInfoAux (info : Option SourceInfo) : Syntax → Option Syntax
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| atom _ val => some $ atom info val
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| ident _ rawVal val pre => some $ ident info rawVal val pre
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| node k args =>
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match updateLast args setTailInfoAux args.size with
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| some args => some $ node k args
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| none => none
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| stx => none
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def setTailInfo (stx : Syntax) (info : Option SourceInfo) : Syntax :=
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match setTailInfoAux info stx with
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| some stx => stx
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| none => stx
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private def reprintLeaf : Option SourceInfo → String → String
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-- no source info => add gracious amounts of whitespace to definitely separate tokens
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-- Note that the proper pretty printer does not use this function.
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-- The parser as well always produces source info, so round-tripping is still
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-- guaranteed.
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| none, val => " " ++ val ++ " "
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| some info, val => info.leading.toString ++ val ++ info.trailing.toString
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partial def reprint : Syntax → Option String
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| atom info val => reprintLeaf info val
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| ident info rawVal _ _ => reprintLeaf info rawVal.toString
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| node kind args =>
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if kind == choiceKind then
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if args.size == 0 then failure
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else do
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s ← reprint (args.get! 0);
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args.foldlFromM (fun s stx => do s' ← reprint stx; guard (s == s'); pure s) s 1
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else args.foldlM (fun r stx => do s ← reprint stx; pure $ r ++ s) ""
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| _ => ""
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open Lean.Format
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partial def formatStxAux (maxDepth : Option Nat) : Nat → Syntax → Format
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| _, atom info val => format $ repr val
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| _, ident _ _ val pre => format "`" ++ format val
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| _, missing => "<missing>"
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| depth, node kind args =>
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let depth := depth + 1;
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if kind == `Lean.Parser.noKind then
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sbracket $
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if depth > maxDepth.getD depth then
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".."
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else
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joinSep (args.toList.map (formatStxAux depth)) line
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else
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let shorterName := kind.replacePrefix `Lean.Parser Name.anonymous;
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let header := format shorterName;
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let body : List Format :=
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if depth > maxDepth.getD depth then [".."] else args.toList.map (formatStxAux depth);
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paren $ joinSep (header :: body) line
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def formatStx (stx : Syntax) (maxDepth : Option Nat := none) : Format :=
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formatStxAux maxDepth 0 stx
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instance : HasFormat (Syntax) := ⟨formatStx⟩
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instance : HasToString (Syntax) := ⟨toString ∘ format⟩
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end Syntax
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namespace SyntaxNode
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@[inline] def getIdAt (n : SyntaxNode) (i : Nat) : Name :=
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(n.getArg i).getId
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end SyntaxNode
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/- Helper functions for creating Syntax objects using C++ -/
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@[export lean_mk_syntax_atom]
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def mkSimpleAtom (val : String) : Syntax :=
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Syntax.atom none val
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@[export lean_mk_syntax_ident]
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def mkSimpleIdent (val : Name) : Syntax :=
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Syntax.ident none (toString val).toSubstring val []
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@[export lean_mk_syntax_list]
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def mkListNode (args : Array Syntax) : Syntax :=
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Syntax.node nullKind args
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def mkAtom (val : String) : Syntax :=
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Syntax.atom none val
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@[inline] def mkNode (k : SyntaxNodeKind) (args : Array Syntax) : Syntax :=
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Syntax.node k args
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@[inline] def mkNullNode (args : Array Syntax := #[]) : Syntax :=
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Syntax.node nullKind args
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def mkOptionalNode (arg : Option Syntax) : Syntax :=
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match arg with
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| some arg => Syntax.node nullKind #[arg]
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| none => Syntax.node nullKind #[]
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/- Helper functions for creating string and numeric literals -/
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def mkStxLit (kind : SyntaxNodeKind) (val : String) (info : Option SourceInfo := none) : Syntax :=
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let atom : Syntax := Syntax.atom info val;
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Syntax.node kind #[atom]
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def mkStxStrLit (val : String) (info : Option SourceInfo := none) : Syntax :=
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mkStxLit strLitKind (repr val) info
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def mkStxNumLit (val : String) (info : Option SourceInfo := none) : Syntax :=
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mkStxLit numLitKind val info
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@[export lean_mk_syntax_str_lit]
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def mkStxStrLitAux (val : String) : Syntax :=
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mkStxStrLit val
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@[export lean_mk_syntax_num_lit]
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def mkStxNumLitAux (val : Nat) : Syntax :=
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mkStxNumLit (toString val)
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namespace Syntax
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/- Recall that we don't have special Syntax constructors for storing numeric and string atoms.
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The idea is to have an extensible approach where embedded DSLs may have new kind of atoms and/or
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different ways of representing them. So, our atoms contain just the parsed string.
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The main Lean parser uses the kind `numLitKind` for storing natural numbers that can be encoded
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in binary, octal, decimal and hexadecimal format. `isNatLit` implements a "decoder"
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for Syntax objects representing these numerals. -/
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private partial def decodeBinLitAux (s : String) : String.Pos → Nat → Option Nat
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| i, val =>
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if s.atEnd i then some val
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else
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let c := s.get i;
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if c == '0' then decodeBinLitAux (s.next i) (2*val)
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else if c == '1' then decodeBinLitAux (s.next i) (2*val + 1)
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else none
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private partial def decodeOctalLitAux (s : String) : String.Pos → Nat → Option Nat
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| i, val =>
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if s.atEnd i then some val
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else
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let c := s.get i;
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if '0' ≤ c && c ≤ '7' then decodeOctalLitAux (s.next i) (8*val + c.toNat - '0'.toNat)
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else none
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private def decodeHexDigit (s : String) (i : String.Pos) : Option (Nat × String.Pos) :=
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let c := s.get i;
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let i := s.next i;
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if '0' ≤ c && c ≤ '9' then some (c.toNat - '0'.toNat, i)
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else if 'a' ≤ c && c ≤ 'f' then some (10 + c.toNat - 'a'.toNat, i)
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else if 'A' ≤ c && c ≤ 'F' then some (10 + c.toNat - 'A'.toNat, i)
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else none
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private partial def decodeHexLitAux (s : String) : String.Pos → Nat → Option Nat
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| i, val =>
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if s.atEnd i then some val
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else match decodeHexDigit s i with
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| some (d, i) => decodeHexLitAux i (16*val + d)
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| none => none
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private partial def decodeDecimalLitAux (s : String) : String.Pos → Nat → Option Nat
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| i, val =>
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if s.atEnd i then some val
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else
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let c := s.get i;
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if '0' ≤ c && c ≤ '9' then decodeDecimalLitAux (s.next i) (10*val + c.toNat - '0'.toNat)
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else none
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private def decodeNatLitVal (s : String) : Option Nat :=
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let len := s.length;
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if len == 0 then none
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else
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let c := s.get 0;
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if c == '0' then
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if len == 1 then some 0
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else
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let c := s.get 1;
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if c == 'x' || c == 'X' then decodeHexLitAux s 2 0
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else if c == 'b' || c == 'B' then decodeBinLitAux s 2 0
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else if c == 'o' || c == 'O' then decodeOctalLitAux s 2 0
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else if c.isDigit then decodeDecimalLitAux s 0 0
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else none
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else if c.isDigit then decodeDecimalLitAux s 0 0
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else none
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def isNatLitAux (nodeKind : SyntaxNodeKind) : Syntax → Option Nat
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| Syntax.node k args =>
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if k == nodeKind && args.size == 1 then
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match args.get! 0 with
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| (Syntax.atom _ val) => decodeNatLitVal val
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| _ => none
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else
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none
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| _ => none
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def isNatLit? (s : Syntax) : Option Nat :=
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isNatLitAux numLitKind s
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def isFieldIdx? (s : Syntax) : Option Nat :=
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isNatLitAux fieldIdxKind s
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def isIdOrAtom? : Syntax → Option String
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| Syntax.atom _ val => some val
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| Syntax.ident _ rawVal _ _ => some rawVal.toString
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| _ => none
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def toNat (stx : Syntax) : Nat :=
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match stx.isNatLit? with
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| some val => val
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| none => 0
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private def decodeQuotedChar (s : String) (i : String.Pos) : Option (Char × String.Pos) :=
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let c := s.get i;
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||
let i := s.next i;
|
||
if c == '\\' then pure ('\\', i)
|
||
else if c = '\"' then pure ('\"', i)
|
||
else if c = '\'' then pure ('\'', i)
|
||
else if c = 'n' then pure ('\n', i)
|
||
else if c = 't' then pure ('\t', i)
|
||
else if c = 'x' then do
|
||
(d₁, i) ← decodeHexDigit s i;
|
||
(d₂, i) ← decodeHexDigit s i;
|
||
pure (Char.ofNat (16*d₁ + d₂), i)
|
||
else if c = 'u' then do
|
||
(d₁, i) ← decodeHexDigit s i;
|
||
(d₂, i) ← decodeHexDigit s i;
|
||
(d₃, i) ← decodeHexDigit s i;
|
||
(d₄, i) ← decodeHexDigit s i;
|
||
pure $ (Char.ofNat (16*(16*(16*d₁ + d₂) + d₃) + d₄), i)
|
||
else
|
||
none
|
||
|
||
partial def decodeStrLitAux (s : String) : String.Pos → String → Option String
|
||
| i, acc => do
|
||
let c := s.get i;
|
||
let i := s.next i;
|
||
if c == '\"' then
|
||
pure acc
|
||
else if c == '\\' then do
|
||
(c, i) ← decodeQuotedChar s i;
|
||
decodeStrLitAux i (acc.push c)
|
||
else
|
||
decodeStrLitAux i (acc.push c)
|
||
|
||
def decodeStrLit (s : String) : Option String :=
|
||
decodeStrLitAux s 1 ""
|
||
|
||
def isStrLit? : Syntax → Option String
|
||
| Syntax.node k args =>
|
||
if k == strLitKind && args.size == 1 then
|
||
match args.get! 0 with
|
||
| (Syntax.atom _ val) => decodeStrLit val
|
||
| _ => none
|
||
else
|
||
none
|
||
| _ => none
|
||
|
||
def decodeCharLit (s : String) : Option Char :=
|
||
let c := s.get 1;
|
||
if c == '\\' then do
|
||
(c, _) ← decodeQuotedChar s 2;
|
||
pure c
|
||
else
|
||
pure c
|
||
|
||
def isCharLit? : Syntax → Option Char
|
||
| Syntax.node k args =>
|
||
if k == charLitKind && args.size == 1 then
|
||
match args.get! 0 with
|
||
| (Syntax.atom _ val) => decodeCharLit val
|
||
| _ => none
|
||
else
|
||
none
|
||
| _ => none
|
||
|
||
def hasArgs : Syntax → Bool
|
||
| Syntax.node _ args => args.size > 0
|
||
| _ => false
|
||
|
||
end Syntax
|
||
|
||
/-- Create an identifier using `SourceInfo` from `src` -/
|
||
def mkIdentFrom (src : Syntax) (val : Name) : Syntax :=
|
||
let info := src.getHeadInfo;
|
||
Syntax.ident info (toString val).toSubstring val []
|
||
|
||
def mkAtomFrom (src : Syntax) (val : String) : Syntax :=
|
||
let info := src.getHeadInfo;
|
||
Syntax.atom info val
|
||
|
||
end Lean
|