38 lines
914 B
Text
38 lines
914 B
Text
/-
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Copyright (c) 2020 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, Mario Carneiro
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-/
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module
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prelude
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import Init.Data.Array.Set
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/-!
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# Helper functions for `Syntax`.
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These are delayed here to allow some time to bootstrap `Array`.
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-/
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namespace Lean.Syntax
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/--
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Updates the argument list without changing the node kind.
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Does nothing for non-`node` nodes.
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-/
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def setArgs (stx : Syntax) (args : Array Syntax) : Syntax :=
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match stx with
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| node info k _ => node info k args
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| stx => stx
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/--
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Updates the `i`'th argument of the syntax.
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Does nothing for non-`node` nodes, or if `i` is out of bounds of the node list.
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-/
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def setArg (stx : Syntax) (i : Nat) (arg : Syntax) : Syntax :=
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match stx with
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| node info k args => node info k (args.setIfInBounds i arg)
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| stx => stx
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end Lean.Syntax
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