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Fix CaseDetectionMacro to handle multiple elements and improve casing #3061

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Fix CaseDetectionMacro to handle multiple elements and improve casing #3061

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31 changes: 15 additions & 16 deletions Examples/Sources/MacroExamples/Implementation/Member/CaseDetectionMacro.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -22,29 +22,28 @@ public enum CaseDetectionMacro: MemberMacro {
) throws -> [DeclSyntax] {
declaration.memberBlock.members
.compactMap { $0.decl.as(EnumCaseDeclSyntax.self) }
.map { $0.elements.first!.name }
.map { ($0, $0.initialUppercased) }
.map { original, uppercased in
.map { $0.elements }
.flatMap { $0 }
.map { $0.name }
.map { ($0, $0.pascalcased) }
.map { original, pascalcased in
"""
var is\(raw: uppercased): Bool {
if case .\(raw: original) = self {
return true
}

return false
var is\(raw: pascalcased): Bool {
self == .\(raw: original)
}
"""
}
}
}

extension TokenSyntax {
fileprivate var initialUppercased: String {
let name = self.text
guard let initial = name.first else {
return name
fileprivate var pascalcased: String {
self.text
.replacingOccurrences(of: "_", with: " ")
.replacingOccurrences(of: "(?<=.)([A-Z])", with: " $1", options: .regularExpression)
.lowercased()
.split(separator: " ")
.map { $0.capitalized }
.joined()
}

return "\(initial.uppercased())\(name.dropFirst())"
}
}