Hi,
I've been playing around with macros and I found myself in a situation where I got attached accessor macro with 2 parameters - url and method. Both are strings.
It looks like this
public struct MyMacroMacro: AccessorMacro {
public static func expansion<Context, Declaration>(
of node: AttributeSyntax,
providingAccessorsOf declaration: Declaration,
in context: Context
) throws -> [AccessorDeclSyntax] where Context : MacroExpansionContext, Declaration : DeclSyntaxProtocol {
guard let expressions = node.argument?.as(TupleExprElementListSyntax.self) else {
//TODO throw error
return []
}
let segments = expressions.compactMap { $0.expression.as(StringLiteralExprSyntax.self)?.segments }
let params = segments.compactMap { $0.trimmedDescription }
guard params.count == 2 else {
//TODO throw error
return []
}
return [
"""
.init(url: url + "\(raw: params[0])", method: "\(raw: params[1])")
"""
]
}
}
Now, when I call it like:
struct MyStruct {
let url = "https://apple.com"
@MyMacro(url: "/test", method: "some") var myVar: MyCustomType
it produces something like this:
struct MyStruct {
let url = "https://apple.com"
var myVar: MyCustomType
{
.init(url: url + " /test", method: " some")
}
I have no idea why it adds those whitespaces. When debugging, before calling "return" there are no whitespaces in "/test" or "some".
Also - is there a way to create a macro that'll call another macro?
For example MySecondMacro(url: "/url") to call MyMacro(url: "/url", method: "second")?
3
0
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