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Add #printArguments macro
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,49 @@ | ||
| // | ||
| // PrintArgumentsMacro.swift | ||
| // MacroExamplesPlugin | ||
| // | ||
| // Created by Stephen Kockentiedt on 18.12.22. | ||
| // | ||
|
|
||
| import SwiftSyntax | ||
| import SwiftSyntaxBuilder | ||
| import _SwiftSyntaxMacros | ||
|
|
||
| public struct PrintArgumentsMacro: ExpressionMacro { | ||
| public static func expansion( | ||
| of node: MacroExpansionExprSyntax, in context: inout MacroExpansionContext | ||
| ) -> ExprSyntax { | ||
| var syntax = node.as(Syntax.self) | ||
| while syntax != nil && syntax!.as(FunctionDeclSyntax.self) == nil { | ||
| syntax = syntax!.parent | ||
| } | ||
|
|
||
| guard let functionSyntax = syntax!.as(FunctionDeclSyntax.self) else { return "" } | ||
| let signature: FunctionSignatureSyntax = functionSyntax.signature | ||
| let parameterList = signature.input.parameterList | ||
|
|
||
| // For a function `doSomething(_ a: Int, b: String, c: Double)`, the expanded epression shall be `print("doSomething(\(a), b: \(b), c: \(c))")` | ||
|
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| let parameters = parameterList.map { parameter -> String in | ||
| let potentialLabel = parameter.firstName!.withoutTrivia().description | ||
| let label = potentialLabel == "_" ? nil : potentialLabel | ||
| let potentialName = parameter.secondName?.withoutTrivia().description ?? potentialLabel | ||
| let name = potentialName == "_" ? nil : potentialName | ||
| var string: String | ||
| if let label { | ||
| string = "\(label): " | ||
| } else { | ||
| string = "" | ||
| } | ||
| if let name { | ||
| string += "\\(\(name))" | ||
| } else { | ||
| string += "_" | ||
| } | ||
| return string | ||
| } | ||
| let parametersString = parameters.joined(separator: ", ") | ||
|
|
||
| return "print(\"\(raw: functionSyntax.identifier.description)(\(raw: parametersString))\")" | ||
| } | ||
| } | ||
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Now that macro implementations are getting "detached" nodes, the parent of the main syntax node will always be
nil, so#printArgumentswill always return the empty string.There was a problem hiding this comment.
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That's a little unfortunate. So the solution of providing a 'spine' of the hierarchy is not the way to go?