add Expression readable string representations

Author: DivineDominion

SearchExpressionParser.xcodeproj/project.pbxproj

@@ -31,6 +31,7 @@
 		5048DFAC2078D0F900BAA4B0 /* AnyEquatable.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5048DFAB2078D0F900BAA4B0 /* AnyEquatable.swift */; };
 		5048DFAE2078D50500BAA4B0 /* TokenBuffer.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5048DFAD2078D50500BAA4B0 /* TokenBuffer.swift */; };
 		5048DFB02078D57D00BAA4B0 /* XCTAssertEqual+Expression.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5048DFAF2078D57D00BAA4B0 /* XCTAssertEqual+Expression.swift */; };
+		50765465207DEBC00090D5D2 /* Descriptions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 50765464207DEBC00090D5D2 /* Descriptions.swift */; };
 		50976269207937820002881A /* BalanceParenthesesTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 50976268207937820002881A /* BalanceParenthesesTests.swift */; };
 		5097626B207B44620002881A /* SearchExpressionParser.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5097626A207B44620002881A /* SearchExpressionParser.swift */; };
 		50976270207B47760002881A /* ExpressionTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5097626F207B47760002881A /* ExpressionTests.swift */; };
@@ -74,6 +75,7 @@
 		5048DFAB2078D0F900BAA4B0 /* AnyEquatable.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AnyEquatable.swift; sourceTree = "<group>"; };
 		5048DFAD2078D50500BAA4B0 /* TokenBuffer.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TokenBuffer.swift; sourceTree = "<group>"; };
 		5048DFAF2078D57D00BAA4B0 /* XCTAssertEqual+Expression.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "XCTAssertEqual+Expression.swift"; sourceTree = "<group>"; };
+		50765464207DEBC00090D5D2 /* Descriptions.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Descriptions.swift; sourceTree = "<group>"; };
 		50976268207937820002881A /* BalanceParenthesesTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = BalanceParenthesesTests.swift; sourceTree = "<group>"; };
 		5097626A207B44620002881A /* SearchExpressionParser.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SearchExpressionParser.swift; sourceTree = "<group>"; };
 		5097626F207B47760002881A /* ExpressionTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ExpressionTests.swift; sourceTree = "<group>"; };
@@ -136,6 +138,7 @@
 				5048DFA92078D00F00BAA4B0 /* ParserTests.swift */,
 				50976268207937820002881A /* BalanceParenthesesTests.swift */,
 				5097626F207B47760002881A /* ExpressionTests.swift */,
+				50765464207DEBC00090D5D2 /* Descriptions.swift */,
 				5048DF8520789FD300BAA4B0 /* TestHelpers.swift */,
 				5048DFAF2078D57D00BAA4B0 /* XCTAssertEqual+Expression.swift */,
 				5048DF8C2078A3C600BAA4B0 /* XCTAssertEqual+Token.swift */,
@@ -326,6 +329,7 @@
 				50976269207937820002881A /* BalanceParenthesesTests.swift in Sources */,
 				5048DFAA2078D00F00BAA4B0 /* ParserTests.swift in Sources */,
 				5048DF6D2078985800BAA4B0 /* TokenizerTests.swift in Sources */,
+				50765465207DEBC00090D5D2 /* Descriptions.swift in Sources */,
 				50976270207B47760002881A /* ExpressionTests.swift in Sources */,
 				5048DFB02078D57D00BAA4B0 /* XCTAssertEqual+Expression.swift in Sources */,
 				5048DF8D2078A3C600BAA4B0 /* XCTAssertEqual+Token.swift in Sources */,

SearchExpressionParserTests/Descriptions.swift

@@ -0,0 +1,29 @@
+//  Copyright © 2018 Christian Tietze. All rights reserved. Distributed under the MIT License.
+
+import SearchExpressionParser
+
+// Here are String representations that ease reading in failure statements
+
+extension ContainsNode: CustomStringConvertible {
+    public var description: String {
+        return "ContainsNode(\"\(self.string)\")"
+    }
+}
+
+extension NotNode: CustomStringConvertible {
+    public var description: String {
+        return "NotNode(\(self.expression))"
+    }
+}
+
+extension AndNode: CustomStringConvertible {
+    public var description: String {
+        return "AndNode(lhs: \(self.lhs), rhs: \(self.rhs))"
+    }
+}
+
+extension OrNode: CustomStringConvertible {
+    public var description: String {
+        return "OrNode(lhs: \(self.lhs), rhs: \(self.rhs))"
+    }
+}