65 lines
3.1 KiB
Text
65 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.Parser.Command
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namespace Lean
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namespace Parser
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@[init] def regBuiltinSyntaxParserAttr : IO Unit :=
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let leadingIdentAsSymbol := true;
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registerBuiltinParserAttribute `builtinSyntaxParser `syntax leadingIdentAsSymbol
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@[inline] def syntaxParser {k : ParserKind} (rbp : Nat := 0) : Parser k :=
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categoryParser `syntax rbp
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namespace Syntax
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def maxPrec := parser! nonReservedSymbol "max"
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def precedenceLit : Parser := numLit <|> maxPrec
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def «precedence» := parser! " : " >> precedenceLit
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@[builtinSyntaxParser] def paren := parser! "(" >> many1 syntaxParser >> ")"
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@[builtinSyntaxParser] def cat := parser! ident >> optional «precedence»
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@[builtinSyntaxParser] def atom := parser! strLit >> optional «precedence»
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@[builtinSyntaxParser] def num := parser! nonReservedSymbol "num"
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@[builtinSyntaxParser] def str := parser! nonReservedSymbol "str"
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@[builtinSyntaxParser] def char := parser! nonReservedSymbol "char"
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@[builtinSyntaxParser] def ident := parser! nonReservedSymbol "ident"
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@[builtinSyntaxParser] def try := parser! nonReservedSymbol "try " >> syntaxParser
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@[builtinSyntaxParser] def lookahead := parser! nonReservedSymbol "lookahead " >> syntaxParser
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@[builtinSyntaxParser] def optional := parser! nonReservedSymbol "optional " >> syntaxParser
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@[builtinSyntaxParser] def sepBy := parser! nonReservedSymbol "sepBy " >> syntaxParser >> syntaxParser
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@[builtinSyntaxParser] def sepBy1 := parser! nonReservedSymbol "sepBy1 " >> syntaxParser >> syntaxParser
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@[builtinSyntaxParser] def many := tparser! pushLeading >> symbolAux "*" none
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@[builtinSyntaxParser] def many1 := tparser! pushLeading >> symbolAux "+" none
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@[builtinSyntaxParser] def orelse := tparser! pushLeading >> " <|> " >> syntaxParser 1
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end Syntax
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namespace Command
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def quotedSymbolPrec := parser! quotedSymbol >> optional Syntax.precedence
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def «prefix» := parser! "prefix"
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def «infix» := parser! "infix"
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def «infixl» := parser! "infixl"
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def «infixr» := parser! "infixr"
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def «postfix» := parser! "postfix"
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def mixfixKind := «prefix» <|> «infix» <|> «infixl» <|> «infixr» <|> «postfix»
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-- TODO delete reserve
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@[builtinCommandParser] def «reserve» := parser! "reserve " >> mixfixKind >> quotedSymbolPrec
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def mixfixSymbol := quotedSymbolPrec <|> unquotedSymbol
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@[builtinCommandParser] def «mixfix» := parser! mixfixKind >> mixfixSymbol >> " := " >> termParser
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def strLitPrec := parser! strLit >> optional Syntax.precedence
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def identPrec := parser! ident >> optional Syntax.precedence
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@[builtinCommandParser] def «notation» := parser! "notation" >> many (strLitPrec <|> quotedSymbolPrec <|> identPrec) >> " := " >> termParser
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@[builtinCommandParser] def «macro» := parser! "macro" >> many1Indent Term.matchAlt "'match' alternatives must be indented"
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@[builtinCommandParser] def «syntax» := parser! "syntax " >> optional ("[" >> ident >> "]") >> many1 syntaxParser >> " : " >> ident
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end Command
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end Parser
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end Lean
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