Will Hawkins
103 lines
2.9 KiB
Swift
103 lines
2.9 KiB
Swift
// p4rse, Copyright 2026, Will Hawkins
|
|
//
|
|
// This file is part of p4rse.
|
|
|
|
// This file is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// This program is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU General Public License
|
|
// along with this program. If not, see <https://www.gnu.org/licenses/>.
|
|
|
|
import SwiftCompilerPlugin
|
|
import SwiftSyntax
|
|
import SwiftSyntaxMacros
|
|
|
|
public struct UseOkResult: ExpressionMacro {
|
|
public static func expansion(
|
|
of node: some FreestandingMacroExpansionSyntax,
|
|
in context: some MacroExpansionContext
|
|
) throws -> ExprSyntax {
|
|
|
|
guard let argument = node.argumentList.first?.expression else {
|
|
throw Require.Error.SyntaxError
|
|
}
|
|
|
|
return """
|
|
{
|
|
if case Result.Ok(let __runtime) = \(argument) {
|
|
return __runtime
|
|
} else {
|
|
print("Oh no")
|
|
throw Require.Error.UnexpectedResult
|
|
}
|
|
}()
|
|
"""
|
|
}
|
|
}
|
|
|
|
public struct Require {
|
|
public enum Error: Swift.Error {
|
|
case UnexpectedResult
|
|
case SyntaxError
|
|
}
|
|
}
|
|
|
|
public struct RequireResult: ExpressionMacro {
|
|
public static func expansion(
|
|
of node: some FreestandingMacroExpansionSyntax,
|
|
in context: some MacroExpansionContext
|
|
) throws -> ExprSyntax {
|
|
|
|
guard let argument = node.argumentList.first?.expression else {
|
|
throw Require.Error.SyntaxError
|
|
}
|
|
|
|
return """
|
|
{
|
|
if case Result.Ok(_) = \(argument) {
|
|
true
|
|
} else {
|
|
false
|
|
}
|
|
}()
|
|
"""
|
|
}
|
|
}
|
|
|
|
public struct RequireErrorResult: ExpressionMacro {
|
|
public static func expansion(
|
|
of node: some FreestandingMacroExpansionSyntax,
|
|
in context: some MacroExpansionContext
|
|
) throws -> ExprSyntax {
|
|
|
|
let arguments = node.argumentList.indices
|
|
let expected_error = node.argumentList[arguments.startIndex]
|
|
let error_producer = node.argumentList[arguments.index(after: arguments.startIndex)]
|
|
|
|
return """
|
|
{
|
|
if case Result.Error(\(expected_error)) = \(error_producer) {
|
|
true
|
|
} else {
|
|
false
|
|
}
|
|
}()
|
|
"""
|
|
}
|
|
}
|
|
|
|
|
|
@main
|
|
struct P4Macros: CompilerPlugin {
|
|
var providingMacros: [Macro.Type] = [
|
|
RequireResult.self, RequireErrorResult.self, UseOkResult.self,
|
|
]
|
|
}
|