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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2023 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
//==========================================================================//
// IMPORTANT: The macros defined in this file are intended to test the //
// behavior of MacroSystem. Many of them do not serve as good examples of //
// how macros should be written. In particular, they often lack error //
// handling because it is not needed in the few test cases in which these //
// macros are invoked. //
//==========================================================================//
import SwiftDiagnostics
import SwiftSyntax
import SwiftSyntaxMacroExpansion
import SwiftSyntaxMacros
import SwiftSyntaxMacrosTestSupport
import XCTest
fileprivate struct DeclsFromStringsMacro: DeclarationMacro {
static func expansion(
of node: some FreestandingMacroExpansionSyntax,
in context: some MacroExpansionContext
) throws -> [DeclSyntax] {
var strings: [String] = []
for arg in node.arguments {
guard let value = arg.expression.as(StringLiteralExprSyntax.self)?.representedLiteralValue else {
continue
}
strings.append(value)
}
return strings.map { "\(raw: $0)" }
}
}
final class CodeItemMacroTests: XCTestCase {
private let indentationWidth: Trivia = .spaces(2)
func testUnwrap() {
struct UnwrapMacro: CodeItemMacro {
static func expansion(
of node: some FreestandingMacroExpansionSyntax,
in context: some MacroExpansionContext
) throws -> [CodeBlockItemSyntax] {
guard !node.arguments.isEmpty else {
throw SwiftSyntaxMacros.MacroExpansionErrorMessage("'#unwrap' requires arguments")
}
let errorThrower = node.trailingClosure
let identifiers = try node.arguments.map { argument in
guard let declReferenceExpr = argument.expression.as(DeclReferenceExprSyntax.self) else {
throw SwiftSyntaxMacros.MacroExpansionErrorMessage("Arguments must be identifiers")
}
return declReferenceExpr.baseName
}
func elseBlock(_ token: TokenSyntax) -> CodeBlockSyntax {
let expr: ExprSyntax
if let errorThrower {
expr = """
\(errorThrower)("\(raw: token.text)")
"""
} else {
expr = """
fatalError("'\(raw: token.text)' is nil")
"""
}
return .init(
statements: .init([
.init(
leadingTrivia: " ",
item: .expr(expr),
trailingTrivia: " "
)
])
)
}
return identifiers.map { (identifier) -> CodeBlockItemSyntax in
"guard let \(raw: identifier.text) else \(elseBlock(identifier))"
}
}
}
assertMacroExpansion(
#"""
let x: Int? = 1
let y: Int? = nil
let z: Int? = 3
#unwrap(x, y, z)
#unwrap(x, y, z) {
fatalError("nil is \\($0)")
}
"""#,
expandedSource: #"""
let x: Int? = 1
let y: Int? = nil
let z: Int? = 3
guard let x else {
fatalError("'x' is nil")
}
guard let y else {
fatalError("'y' is nil")
}
guard let z else {
fatalError("'z' is nil")
}
guard let x else {
{
fatalError("nil is \\($0)")
}("x")
}
guard let y else {
{
fatalError("nil is \\($0)")
}("y")
}
guard let z else {
{
fatalError("nil is \\($0)")
}("z")
}
"""#,
macros: ["unwrap": UnwrapMacro.self],
indentationWidth: indentationWidth
)
}
func testEmpty() {
struct TestMacro: CodeItemMacro {
static func expansion(
of node: some FreestandingMacroExpansionSyntax,
in context: some MacroExpansionContext
) throws -> [CodeBlockItemSyntax] {
return []
}
}
assertMacroExpansion(
"#test",
expandedSource: "",
macros: [
"test": TestMacro.self
]
)
}
}
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