40 lines
1.4 KiB
Text
40 lines
1.4 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.parser
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namespace Lean
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namespace Parser
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@[init mkBuiltinParsingTablesRef]
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constant builtinLevelParsingTable : IO.Ref ParsingTables := default _
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@[init] def regBuiltinLevelParserAttr : IO Unit :=
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registerBuiltinParserAttribute `builtinLevelParser `Lean.Parser.builtinLevelParsingTable
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def mkLevelParserAttribute : IO ParserAttribute :=
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registerParserAttribute `levelParser "level" "universe level parser" (some builtinLevelParsingTable)
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@[init mkLevelParserAttribute]
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constant levelParserAttribute : ParserAttribute := default _
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@[inline] def levelParser {k : ParserKind} (rbp : Nat := 0) : Parser k :=
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{ fn := fun _ => levelParserAttribute.runParser rbp }
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namespace Level
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@[builtinLevelParser] def paren := parser! symbol "(" appPrec >> levelParser >> ")"
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@[builtinLevelParser] def max := parser! symbolOrIdent "max" >> many1 (levelParser appPrec)
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@[builtinLevelParser] def imax := parser! symbolOrIdent "imax" >> many1 (levelParser appPrec)
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@[builtinLevelParser] def hole := parser! "_"
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@[builtinLevelParser] def num := parser! numLit
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@[builtinLevelParser] def ident := parser! ident
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@[builtinLevelParser] def addLit := tparser! pushLeading >> symbol "+" (65:Nat) >> numLit
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end Level
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end Parser
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end Lean
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