Will Hawkins
104 lines
3.1 KiB
Swift
104 lines
3.1 KiB
Swift
// p4rse, Copyright 2026, Will Hawkins
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//
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// This file is part of p4rse.
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//
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// This file is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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import SwiftCompilerPlugin
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import SwiftSyntax
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import SwiftSyntaxMacros
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public struct UseOkResult: ExpressionMacro {
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public static func expansion(
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of node: some FreestandingMacroExpansionSyntax,
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in context: some MacroExpansionContext
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) throws -> ExprSyntax {
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guard let argument = node.argumentList.first?.expression else {
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throw Require.Error.SyntaxError
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}
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return """
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{
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switch \(argument) {
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case Result.Ok(let __good): return __good
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case Result.Error(let __error):
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print("Unexpected result: \\(__error)")
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throw Require.Error.UnexpectedResult
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}
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}()
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"""
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}
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}
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public struct Require {
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public enum Error: Swift.Error {
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case UnexpectedResult
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case SyntaxError
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}
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}
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public struct RequireResult: ExpressionMacro {
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public static func expansion(
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of node: some FreestandingMacroExpansionSyntax,
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in context: some MacroExpansionContext
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) throws -> ExprSyntax {
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guard let argument = node.argumentList.first?.expression else {
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throw Require.Error.SyntaxError
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}
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return """
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{
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switch \(argument) {
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case Result.Ok(let _): return true
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case Result.Error(let __error):
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print("Unexpected result: \\(__error)")
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return false
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}
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}()
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"""
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}
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}
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public struct RequireErrorResult: ExpressionMacro {
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public static func expansion(
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of node: some FreestandingMacroExpansionSyntax,
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in context: some MacroExpansionContext
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) throws -> ExprSyntax {
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let arguments = node.argumentList.indices
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let expected_error = node.argumentList[arguments.startIndex]
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let error_producer = node.argumentList[arguments.index(after: arguments.startIndex)]
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return """
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{
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if case Result.Error(\(expected_error)) = \(error_producer) {
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true
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} else {
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false
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}
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}()
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"""
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}
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}
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@main
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struct P4Macros: CompilerPlugin {
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var providingMacros: [Macro.Type] = [
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RequireResult.self, RequireErrorResult.self, UseOkResult.self,
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]
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}
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