40 lines
1.3 KiB
Text
40 lines
1.3 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 Lean.Attributes
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namespace Lean
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private def isValidCppId (id : String) : Bool :=
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let first := id.get 0;
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first.isAlpha && (id.toSubstring.drop 1).all (fun c => c.isAlpha || c.isDigit || c == '_')
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private def isValidCppName : Name → Bool
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| .str .anonymous s => isValidCppId s
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| .str p s => isValidCppId s && isValidCppName p
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| _ => false
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builtin_initialize exportAttr : ParametricAttribute Name ←
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registerParametricAttribute {
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name := `export,
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descr := "name to be used by code generators",
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getParam := fun _ stx => do
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let exportName ← Attribute.Builtin.getId stx
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unless isValidCppName exportName do
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throwError "invalid 'export' function name, is not a valid C++ identifier"
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return exportName
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}
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@[export lean_get_export_name_for]
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def getExportNameFor? (env : Environment) (n : Name) : Option Name :=
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exportAttr.getParam? env n
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def isExport (env : Environment) (n : Name) : Bool :=
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-- The main function morally is an exported function as well. In particular,
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-- it should not participate in borrow inference.
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(getExportNameFor? env n).isSome || n == `main
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end Lean
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