added float rule with tests

Author: cameronmccord2

Validator.xcodeproj/project.pbxproj

@@ -26,6 +26,7 @@
 		62DC8D6E1AAA42CE0095DFA7 /* PasswordRule.swift in Sources */ = {isa = PBXBuildFile; fileRef = 62DC8D6B1AAA42CE0095DFA7 /* PasswordRule.swift */; };
 		62DC8D711AAA43110095DFA7 /* ZipCodeRule.swift in Sources */ = {isa = PBXBuildFile; fileRef = 62DC8D701AAA43110095DFA7 /* ZipCodeRule.swift */; };
 		62E9E2AD1ACFB336000A939C /* RegexRule.swift in Sources */ = {isa = PBXBuildFile; fileRef = 62E9E2AC1ACFB336000A939C /* RegexRule.swift */; };
+		DC5A35EC1AF99BA60013FE6B /* FloatRule.swift in Sources */ = {isa = PBXBuildFile; fileRef = DC5A35EB1AF99BA60013FE6B /* FloatRule.swift */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXContainerItemProxy section */
@@ -62,6 +63,7 @@
 		62DC8D6B1AAA42CE0095DFA7 /* PasswordRule.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = PasswordRule.swift; sourceTree = "<group>"; };
 		62DC8D701AAA43110095DFA7 /* ZipCodeRule.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ZipCodeRule.swift; sourceTree = "<group>"; };
 		62E9E2AC1ACFB336000A939C /* RegexRule.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = RegexRule.swift; sourceTree = "<group>"; };
+		DC5A35EB1AF99BA60013FE6B /* FloatRule.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = FloatRule.swift; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -171,6 +173,7 @@
 				62DC8D701AAA43110095DFA7 /* ZipCodeRule.swift */,
 				628637271AAA49E300BC8FCF /* ConfirmRule.swift */,
 				62E9E2AC1ACFB336000A939C /* RegexRule.swift */,
+				DC5A35EB1AF99BA60013FE6B /* FloatRule.swift */,
 			);
 			name = Rules;
 			sourceTree = "<group>";
@@ -283,6 +286,7 @@
 				628637281AAA49E300BC8FCF /* ConfirmRule.swift in Sources */,
 				62DC8D651AAA42520095DFA7 /* Rule.swift in Sources */,
 				62D1AE1F1A1E6D4400E4DFF8 /* ViewController.swift in Sources */,
+				DC5A35EC1AF99BA60013FE6B /* FloatRule.swift in Sources */,
 				62DC8D6D1AAA42CE0095DFA7 /* RequiredRule.swift in Sources */,
 				62D1AE1D1A1E6D4400E4DFF8 /* AppDelegate.swift in Sources */,
 				62D1AE581A1E700200E4DFF8 /* Validator.swift in Sources */,

Validator/FloatRule.swift

@@ -0,0 +1,29 @@
+//
+//  FloatRule.swift
+//  Validator
+//
+//  Created by Cameron McCord on 5/5/15.
+//  Copyright (c) 2015 jpotts18. All rights reserved.
+//
+
+import Foundation
+
+public class FloatRule:Rule {
+    
+    public init(){
+        
+    }
+    
+    public func validate(value: String) -> Bool {
+        let regex = NSRegularExpression(pattern: "[-+]?(\\d*[.])?\\d+", options: nil, error: nil)
+        if let regex = regex {
+            let match = regex.numberOfMatchesInString(value, options: nil, range: NSRange(location: 0, length: count(value)))
+            return match == 1
+        }
+        return false
+    }
+    
+    public func errorMessage() -> String {
+        return "This must be a number with or without a decimal"
+    }
+}

ValidatorTests/ValidatorTests.swift

@@ -27,6 +27,9 @@ class ValidatorTests: XCTestCase {
     let VALID_PASSWORD = "Super$ecret"
     let INVALID_PASSWORD = "abc"
 
+    let VALID_FLOAT = "1234.444"
+    let INVALID_FLOAT = "1234.44.44"
+    
     let LEN_3 = "hey"
     let LEN_5 = "Howdy"
     let LEN_20 = "Paint the cat orange"
@@ -94,6 +97,17 @@ class ValidatorTests: XCTestCase {
         XCTAssertFalse(EmailRule().validate(INVALID_EMAIL), "Email should be invalid")
     }
 
+    // MARK: Float
+    
+    func testFloat() {
+        XCTAssert(FloatRule().validate(VALID_FLOAT), "Float should be valid")
+    }
+    
+    func testFloatInvalid() {
+        XCTAssert(!FloatRule().validate(INVALID_FLOAT), "Float should be invalid")
+        XCTAssert(!FloatRule().validate(VALID_EMAIL), "Float should be invalid")
+    }
+    
     // MARK: Confirm against field
 
     func testConfirmSame(){