[Macros] Add API for expanding a macro defined in terms of another macro #1412
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@swift-ci please test |
Split the API for macro definition checking and expansion into two distinct parts: a definition-checking operation that can fail (producing error diagnostics) and an expansion operation that cannot fail (for expansion). This better matches the structure that clients (i.e., the compiler) should use.
We are likely to grow more of these utilities, and they might eventually be sunk down into a common library, so keep the factored out.
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@swift-ci please test |
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@swift-ci please test |
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@swift-ci please test Windows |
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I'm holding off on merging this until I have the compiler side of it implemented, to make sure we have the right API here. |
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Introduce APIs to help with expanding a macro that is defined in terms of another macro, e.g.,
There are effectively two new APIs:
MacroDeclSyntax.checkDefinition()checks that the definition of a macro is well-formed, producing a semantic representation suitable for expansion when it is, or produces error diagnostics when it isn't.MacroDeclSyntax.expandwhich takes that semantic representation and a (well-formed) argument list or syntax node and performs the actual expansion.