From 415816c78b6e3d6a8baeee2aba56adfb1ecc7a53 Mon Sep 17 00:00:00 2001
From: Eugene <e@egeek.me>
Date: Fri, 18 Jun 2021 07:40:07 +0300
Subject: [PATCH] Return the first step from `ConjunctionBuilder`

The result builder and its tests are only supported in swift 5.4+.
---
 .../project.pbxproj                           |  8 +++++++
 .../ConjunctionBuilder.swift                  | 24 +++++++++++++++++++
 .../ConjunctionBuilderTests.swift             | 21 ++++++++++++++++
 3 files changed, 53 insertions(+)
 create mode 100644 LightweightValidation/ConjunctionBuilder.swift
 create mode 100644 LightweightValidationTests/ConjunctionBuilderTests.swift

diff --git a/LightweightValidation.xcodeproj/project.pbxproj b/LightweightValidation.xcodeproj/project.pbxproj
index 0603264..fb5a33f 100644
--- a/LightweightValidation.xcodeproj/project.pbxproj
+++ b/LightweightValidation.xcodeproj/project.pbxproj
@@ -7,6 +7,8 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
+		071DDA9F267DAACE00369489 /* ConjunctionBuilder.swift in Sources */ = {isa = PBXBuildFile; fileRef = 071DDA9E267DAACE00369489 /* ConjunctionBuilder.swift */; };
+		071DDAA3267DAAFF00369489 /* ConjunctionBuilderTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 071DDAA2267DAAFF00369489 /* ConjunctionBuilderTests.swift */; };
 		14BE424E2441BD8800636D18 /* ResponseValidator.swift in Sources */ = {isa = PBXBuildFile; fileRef = 14BE424D2441BD8800636D18 /* ResponseValidator.swift */; };
 		7500D2F18796472EB6193460 /* ResponseValidatorTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 75DD6FD50157DE481178EEC5 /* ResponseValidatorTests.swift */; };
 		751856E71195D54F38792660 /* V.swift in Sources */ = {isa = PBXBuildFile; fileRef = 75A5B579658152CC9DDDFF0A /* V.swift */; };
@@ -25,6 +27,8 @@
 /* End PBXContainerItemProxy section */
 
 /* Begin PBXFileReference section */
+		071DDA9E267DAACE00369489 /* ConjunctionBuilder.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ConjunctionBuilder.swift; sourceTree = "<group>"; };
+		071DDAA2267DAAFF00369489 /* ConjunctionBuilderTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ConjunctionBuilderTests.swift; sourceTree = "<group>"; };
 		14BE424D2441BD8800636D18 /* ResponseValidator.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ResponseValidator.swift; sourceTree = "<group>"; };
 		7516E37763624BA4003C45E4 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.info; path = Info.plist; sourceTree = "<group>"; };
 		755F66236AF76130A0A3DDA4 /* StringError.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = StringError.swift; sourceTree = "<group>"; };
@@ -68,6 +72,7 @@
 			children = (
 				75ACF14D556F65F52C437423 /* Info.plist */,
 				14BE424D2441BD8800636D18 /* ResponseValidator.swift */,
+				071DDA9E267DAACE00369489 /* ConjunctionBuilder.swift */,
 				75A5B579658152CC9DDDFF0A /* V.swift */,
 				755F66236AF76130A0A3DDA4 /* StringError.swift */,
 			);
@@ -88,6 +93,7 @@
 			children = (
 				7516E37763624BA4003C45E4 /* Info.plist */,
 				75DD6FD50157DE481178EEC5 /* ResponseValidatorTests.swift */,
+				071DDAA2267DAAFF00369489 /* ConjunctionBuilderTests.swift */,
 			);
 			path = LightweightValidationTests;
 			sourceTree = "<group>";
@@ -195,6 +201,7 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				071DDA9F267DAACE00369489 /* ConjunctionBuilder.swift in Sources */,
 				14BE424E2441BD8800636D18 /* ResponseValidator.swift in Sources */,
 				751856E71195D54F38792660 /* V.swift in Sources */,
 				753FD777795B093E3ED5A224 /* StringError.swift in Sources */,
@@ -205,6 +212,7 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				071DDAA3267DAAFF00369489 /* ConjunctionBuilderTests.swift in Sources */,
 				7500D2F18796472EB6193460 /* ResponseValidatorTests.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
diff --git a/LightweightValidation/ConjunctionBuilder.swift b/LightweightValidation/ConjunctionBuilder.swift
new file mode 100644
index 0000000..57ea8f9
--- /dev/null
+++ b/LightweightValidation/ConjunctionBuilder.swift
@@ -0,0 +1,24 @@
+//
+//  ConjunctionBuilder.swift
+//  LightweightValidation
+//
+//  Created by user on 19.06.2021.
+//  Copyright © 2021 yes. All rights reserved.
+//
+
+#if swift(>=5.4)
+import Foundation
+
+@resultBuilder
+public struct ConjunctionBuilder {
+    public static func buildBlock <T, E> (_ validations: V<T, E>...) -> V<T, E> {
+        validations[0]
+    }
+}
+
+public extension V {
+    static func all(@ConjunctionBuilder _ validations: () -> V<T, E>) -> V<T, E> {
+        validations()
+    }
+}
+#endif
diff --git a/LightweightValidationTests/ConjunctionBuilderTests.swift b/LightweightValidationTests/ConjunctionBuilderTests.swift
new file mode 100644
index 0000000..9adae29
--- /dev/null
+++ b/LightweightValidationTests/ConjunctionBuilderTests.swift
@@ -0,0 +1,21 @@
+//
+//  ConjunctionBuilderTests.swift
+//  LightweightValidationTests
+//
+//  Created by user on 19.06.2021.
+//  Copyright © 2021 yes. All rights reserved.
+//
+
+#if swift(>=5.4)
+import LightweightValidation
+import XCTest
+
+class ConjunctionBuilderTests: XCTestCase {
+    func testValidStepShouldReturnItself() {
+        let sut = Response.SimpleValidationResult.all {
+            true <?> StringError("never happens")
+        }
+        XCTAssertTrue(sut.isValue)
+    }
+}
+#endif