92 lines
3.1 KiB
Text
92 lines
3.1 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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Authors: Leonardo de Moura, Sebastian Ullrich
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-/
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prelude
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import init.lean.message
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import init.lean.parser.command
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namespace Lean
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namespace Parser
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namespace Module
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def «prelude» := parser! "prelude"
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def importPath := parser! many (rawCh '.' true) >> ident
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def «import» := parser! "import " >> many1 importPath
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def header := parser! optional «prelude» >> many «import»
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def updateTokens (c : ParserContext) : ParserContext :=
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{ tokens := match header.info.updateTokens c.tokens with
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| Except.ok tables => tables
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| Except.error _ => {}, -- unreachable
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.. c }
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end Module
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structure ModuleParser :=
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(context : ParserContextCore)
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(pos : String.Pos := 0)
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(messages : MessageLog := {})
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(recovering : Bool := false)
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instance ModuleParser.inhabited : Inhabited ModuleParser :=
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⟨{context := default _}⟩
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private def mkErrorMessage (c : ParserContext) (pos : String.Pos) (errorMsg : String) : Message :=
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let pos := c.fileMap.toPosition pos;
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{ filename := c.filename, pos := pos, text := errorMsg }
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def mkModuleParser (env : Environment) (input : String) (fileName := "<input>") : Option Syntax × ModuleParser :=
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let c := mkParserContext env input fileName;
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let c := Module.updateTokens c;
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let s := mkParserState input;
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let s := whitespace c s;
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let s := Module.header.fn (0:Nat) c s;
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match s.errorMsg with
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| some errorMsg =>
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let msg := mkErrorMessage c s.pos errorMsg;
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(none, { context := c.toParserContextCore, pos := s.pos, messages := { MessageLog . }.add msg, recovering := true })
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| none =>
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let stx := s.stxStack.back;
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(stx, { context := c.toParserContextCore, pos := s.pos })
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private def mkEOI (pos : String.Pos) : Syntax :=
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let atom := Syntax.atom (some { pos := pos, trailing := "".toSubstring, leading := "".toSubstring }) "";
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Syntax.node `Lean.Parser.Module.eoi [atom].toArray []
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def isEOI (s : Syntax) : Bool :=
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s.isOfKind `Lean.Parser.Module.eoi
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private def consumeInput (c : ParserContext) (pos : String.Pos) : String.Pos :=
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let s : ParserState := { cache := initCacheForInput c.input, pos := pos };
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let s := tokenFn c s;
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match s.errorMsg with
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| some _ => pos + 1
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| none => s.pos
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partial def parseCommand (env : Environment) : ModuleParser → Syntax × ModuleParser
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| p :=
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if p.context.input.atEnd p.pos then
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(mkEOI p.pos, p)
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else
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let c : ParserContext := { env := env, .. p.context };
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let s : ParserState := { cache := initCacheForInput c.input, pos := p.pos };
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let s := (commandParser : Parser).fn (0:Nat) c s;
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match s.errorMsg with
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| none =>
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let stx := s.stxStack.back;
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let p := { pos := s.pos, recovering := false, .. p };
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(stx, p)
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| some errorMsg =>
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if p.recovering then
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let p := { pos := consumeInput c s.pos, .. p };
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parseCommand p
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else
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let msg := mkErrorMessage c s.pos errorMsg;
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let p := { pos := s.pos, recovering := true, messages := p.messages.add msg, .. p };
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parseCommand p
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end Parser
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end Lean
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