67 lines
2.4 KiB
Text
67 lines
2.4 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
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-/
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prelude
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import Init.Lean.Environment
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import Init.Lean.Attributes
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namespace Lean
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private def getIOTypeArg : Expr → Option Expr
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| Expr.app (Expr.const `IO _ _) arg _ => some arg
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| _ => none
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private def isUnitType : Expr → Bool
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| Expr.const `Unit _ _ => true
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| _ => false
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private def isIOUnit (type : Expr) : Bool :=
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match getIOTypeArg type with
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| some type => isUnitType type
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| _ => false
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def mkInitAttr : IO (ParametricAttribute Name) :=
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registerParametricAttribute `init "initialization procedure for global references" $ fun env declName stx =>
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match env.find declName with
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| none => Except.error "unknown declaration"
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| some decl =>
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match attrParamSyntaxToIdentifier stx with
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| some initFnName =>
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match env.find initFnName with
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| none => Except.error ("unknown initialization function '" ++ toString initFnName ++ "'")
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| some initDecl =>
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match getIOTypeArg initDecl.type with
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| none => Except.error ("initialization function '" ++ toString initFnName ++ "' must have type of the form `IO <type>`")
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| some initTypeArg =>
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if decl.type == initTypeArg then Except.ok initFnName
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else Except.error ("initialization function '" ++ toString initFnName ++ "' type mismatch")
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| _ => match stx with
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| Syntax.missing =>
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if isIOUnit decl.type then Except.ok Name.anonymous
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else Except.error "initialization function must have type `IO Unit`"
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| _ => Except.error "unexpected kind of argument"
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@[init mkInitAttr]
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constant initAttr : ParametricAttribute Name := arbitrary _
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def isIOUnitInitFn (env : Environment) (fn : Name) : Bool :=
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match initAttr.getParam env fn with
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| some Name.anonymous => true
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| _ => false
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@[export lean_get_init_fn_name_for]
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def getInitFnNameFor (env : Environment) (fn : Name) : Option Name :=
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match initAttr.getParam env fn with
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| some Name.anonymous => none
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| some n => some n
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| _ => none
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def hasInitAttr (env : Environment) (fn : Name) : Bool :=
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(getInitFnNameFor env fn).isSome
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def setInitAttr (env : Environment) (declName : Name) (initFnName : Name := Name.anonymous) : Except String Environment :=
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initAttr.setParam env declName initFnName
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end Lean
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