Add darts exercise (#193)

* add darts exercise

* Fix inadvertent config formatting

config.json

@@ -310,6 +310,14 @@
         "prerequisites": [],
         "difficulty": 2
       },
+      {
+        "slug": "darts",
+        "name": "Darts",
+        "uuid": "85636c8c-55f6-4890-a6a6-5cbffcbbdd4c",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 2
+      },
       {
         "slug": "all-your-base",
         "name": "All Your Base",

exercises/practice/darts/.docs/instructions.md

@@ -0,0 +1,31 @@
+# Instructions
+
+Write a function that returns the earned points in a single toss of a Darts game.
+
+[Darts][darts] is a game where players throw darts at a [target][darts-target].
+
+In our particular instance of the game, the target rewards 4 different amounts of points, depending on where the dart lands:
+
+![Our dart scoreboard with values from a complete miss to a bullseye](https://assets.exercism.org/images/exercises/darts/darts-scoreboard.svg)
+
+- If the dart lands outside the target, player earns no points (0 points).
+- If the dart lands in the outer circle of the target, player earns 1 point.
+- If the dart lands in the middle circle of the target, player earns 5 points.
+- If the dart lands in the inner circle of the target, player earns 10 points.
+
+The outer circle has a radius of 10 units (this is equivalent to the total radius for the entire target), the middle circle a radius of 5 units, and the inner circle a radius of 1.
+Of course, they are all centered at the same point — that is, the circles are [concentric][] defined by the coordinates (0, 0).
+
+Write a function that given a point in the target (defined by its [Cartesian coordinates][cartesian-coordinates] `x` and `y`, where `x` and `y` are [real][real-numbers]), returns the correct amount earned by a dart landing at that point.
+
+## Credit
+
+The scoreboard image was created by [habere-et-dispertire][habere-et-dispertire] using [Inkscape][inkscape].
+
+[darts]: https://en.wikipedia.org/wiki/Darts
+[darts-target]: https://en.wikipedia.org/wiki/Darts#/media/File:Darts_in_a_dartboard.jpg
+[concentric]: https://mathworld.wolfram.com/ConcentricCircles.html
+[cartesian-coordinates]: https://www.mathsisfun.com/data/cartesian-coordinates.html
+[real-numbers]: https://www.mathsisfun.com/numbers/real-numbers.html
+[habere-et-dispertire]: https://exercism.org/profiles/habere-et-dispertire
+[inkscape]: https://en.wikipedia.org/wiki/Inkscape

exercises/practice/darts/.meta/Example.cfc

@@ -0,0 +1,27 @@
+/**
+* Your implementation of the Darts exercise
+*/
+component {
+
+	/**
+	* @returns 
+	*/
+	function score( x, y) {
+		abs_x = Abs(x)
+		abs_y = Abs(y)
+		distance = Sqr(abs_x * abs_x + abs_y * abs_y)
+		if (distance <= 1) {
+			return 10
+		}
+		else if (distance <= 5) {
+			return 5
+		}
+		else if (distance <= 10) {
+			return 1
+		}
+		else {
+			return 0
+		}
+	}
+
+}

exercises/practice/darts/.meta/ExampleTest.cfc

@@ -0,0 +1,7 @@
+component extends="DartsTest" {
+
+	function beforeAll(){
+	  SUT = createObject( 'Solution' );
+	}
+
+}

exercises/practice/darts/.meta/config.json

@@ -0,0 +1,19 @@
+{
+  "authors": [
+    "BNAndras"
+  ],
+  "files": {
+    "solution": [
+      "Darts.cfc"
+    ],
+    "test": [
+      "DartsTest.cfc"
+    ],
+    "example": [
+      ".meta/Example.cfc",
+      ".meta/ExampleTest.cfc"
+    ]
+  },
+  "blurb": "Write a function that returns the earned points in a single toss of a Darts game.",
+  "source": "Inspired by an exercise created by a professor Della Paolera in Argentina"
+}

exercises/practice/darts/.meta/tests.toml

@@ -0,0 +1,49 @@
+# This is an auto-generated file.
+#
+# Regenerating this file via `configlet sync` will:
+# - Recreate every `description` key/value pair
+# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
+# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
+# - Preserve any other key/value pair
+#
+# As user-added comments (using the # character) will be removed when this file
+# is regenerated, comments can be added via a `comment` key.
+
+[9033f731-0a3a-4d9c-b1c0-34a1c8362afb]
+description = "Missed target"
+
+[4c9f6ff4-c489-45fd-be8a-1fcb08b4d0ba]
+description = "On the outer circle"
+
+[14378687-ee58-4c9b-a323-b089d5274be8]
+description = "On the middle circle"
+
+[849e2e63-85bd-4fed-bc3b-781ae962e2c9]
+description = "On the inner circle"
+
+[1c5ffd9f-ea66-462f-9f06-a1303de5a226]
+description = "Exactly on center"
+
+[b65abce3-a679-4550-8115-4b74bda06088]
+description = "Near the center"
+
+[66c29c1d-44f5-40cf-9927-e09a1305b399]
+description = "Just within the inner circle"
+
+[d1012f63-c97c-4394-b944-7beb3d0b141a]
+description = "Just outside the inner circle"
+
+[ab2b5666-b0b4-49c3-9b27-205e790ed945]
+description = "Just within the middle circle"
+
+[70f1424e-d690-4860-8caf-9740a52c0161]
+description = "Just outside the middle circle"
+
+[a7dbf8db-419c-4712-8a7f-67602b69b293]
+description = "Just within the outer circle"
+
+[e0f39315-9f9a-4546-96e4-a9475b885aa7]
+description = "Just outside the outer circle"
+
+[045d7d18-d863-4229-818e-b50828c75d19]
+description = "Asymmetric position between the inner and middle circles"

exercises/practice/darts/Darts.cfc

@@ -0,0 +1,13 @@
+/**
+* Your implementation of the Darts exercise
+*/
+component {
+
+	/**
+	* @returns 
+	*/
+	function score( x, y ) {
+		// Implement me here
+	}
+
+}

exercises/practice/darts/DartsTest.cfc

@@ -0,0 +1,67 @@
+component extends="testbox.system.BaseSpec" {
+
+	function beforeAll(){
+	  SUT = createObject( 'Darts' );
+	}
+
+	function run(){
+
+		describe( "My Darts class", function(){			
+
+			it( 'Missed target', function(){
+				expect( SUT.score( x=-9, y=9 ) ).toBe( 0 );
+			});
+
+			it( 'On the outer circle', function(){
+				expect( SUT.score( x=0, y=10 ) ).toBe( 1 );
+			});
+
+			it( 'On the middle circle', function(){
+				expect( SUT.score( x=-5, y=0 ) ).toBe( 5 );
+			});
+
+			it( 'On the inner circle', function(){
+				expect( SUT.score( x=0, y=-1 ) ).toBe( 10 );
+			});
+
+			it( 'Exactly on center', function(){
+				expect( SUT.score( x=0, y=0 ) ).toBe( 10 );
+			});
+
+			it( 'Near the center', function(){
+				expect( SUT.score( x=-0.1, y=-0.1 ) ).toBe( 10 );
+			});
+
+			it( 'Just within the inner circle', function(){
+				expect( SUT.score( x=0.7, y=0.7 ) ).toBe( 10 );
+			});
+
+			it( 'Just outside the inner circle', function(){
+				expect( SUT.score( x=0.8, y=-0.8 ) ).toBe( 5 );
+			});
+
+			it( 'Just within the middle circle', function(){
+				expect( SUT.score( x=-3.5, y=3.5 ) ).toBe( 5 );
+			});
+
+			it( 'Just outside the middle circle', function(){
+				expect( SUT.score( x=-3.6, y=-3.6 ) ).toBe( 1 );
+			});
+
+			it( 'Just within the outer circle', function(){
+				expect( SUT.score( x=-7.0, y=7.0 ) ).toBe( 1 );
+			});
+
+			it( 'Just outside the outer circle', function(){
+				expect( SUT.score( x=7.1, y=-7.1 ) ).toBe( 0 );
+			});
+
+			it( 'Asymmetric position between the inner and middle circles', function(){
+				expect( SUT.score( x=0.5, y=-4 ) ).toBe( 5 );
+			});
+
+		});
+
+	}
+
+}

exercises/practice/darts/TestRunner.cfc

@@ -0,0 +1,103 @@
+/**
+* I am a CommandBox task runner which you can use to test your implementation of this exercise against the 
+* provided test suite.  To use me, open the CommandBox CLI and run this:
+* 
+* CommandBox> task run TestRunner
+*
+* To start up a test watcher that will automatically rerun the test suite every time you save a file change, run this:
+*
+* CommandBox> task run TestRunner --watcher
+*
+*/
+component {
+
+	/**
+	* @solution Runs the tests against the solution
+	* @watcher Start up a file watch that re-runs the tests on file changes. Use Ctrl-C to stop
+	*/
+	function run( boolean solution=false, boolean watcher=false ) {
+
+		ensureTestBox();
+
+		if( watcher ) {
+
+			// Tabula rasa
+			command( 'cls' ).run();
+
+			// Start watcher
+			watch()
+				.paths( '*.cfc' )
+				.inDirectory( getCWD() )
+				.withDelay( 500 )
+				.onChange( function() {
+
+					// Clear the screen
+					command( 'cls' )
+						.run();
+
+					// This is neccessary so changes to tests get picked up right away.
+					pagePoolClear();	
+
+					runTests( solution );
+
+				} )
+				.start();
+
+		} else {
+			runTests( solution );
+		}			
+
+	}
+
+	/**
+	* Make sure the TestBox framework is installed
+	*/
+	private function ensureTestBox() {
+		var excerciseRoot = getCWD();
+		var testBoxRoot = excerciseRoot & '/testbox';
+
+		if( !directoryExists( testBoxRoot ) ) {
+
+			print.boldYellowLine( 'Installing some missing dependencies for you!' ).toConsole();
+			command( 'install' )
+				.inWorkingDirectory( excerciseRoot )
+				.run();
+		}
+
+		// Bootstrap TestBox framework
+		filesystemUtil.createMapping( '/testbox', testBoxRoot );
+	}
+
+	/**
+	* Invoke TestBox to run the test suite
+	*/
+	private function runTests( boolean solution=false ) {
+
+		// Create TestBox and run the tests
+		testData = new testbox.system.TestBox()
+			.runRaw( directory = {
+				// Find all CFCs...
+				mapping = filesystemUtil.makePathRelative( getCWD() ),
+				// ... in this directory ...
+				recurse = false,
+				// ... whose name ends in "test"
+				filter = function( path ) {
+					return path.reFind( ( solution ? 'Solution' : '' ) & 'Test.cfc$' );
+				 }
+			} )
+			.getMemento();
+
+		// Print out the results with ANSI formatting for the CLI
+		getInstance( 'CLIRenderer@testbox-commands' )
+			.render( print, testData, true );
+
+		print.toConsole();
+
+		// Set proper exit code
+		if( testData.totalFail || testData.totalError ) {
+			setExitCode( 1 );
+		}
+	}
+
+}
+

exercises/practice/darts/box.json

@@ -0,0 +1,8 @@
+{
+    "dependencies":{
+        "testbox":"^2.5.0+107"
+    },
+    "installPaths":{
+        "testbox":"testbox/"
+    }
+}

exercises/practice/darts/index.cfm

@@ -0,0 +1,37 @@
+<!--- 
+
+This file will only be used if you want to start up a web server in this directory.  You can do so by running:
+
+$> box
+CommandBox> install
+CommandBox> server start
+
+However, this is not necessary unless you really just want to use the HTML reporters on TestBox.  
+Ideally, you'll skip the need for this file entirely and just run the tests directly frm the CLI like this:
+
+CommandBox> task run TestRunner
+
+ --->
+<cfsetting showDebugOutput="false">
+<cfparam name="url.reporter" 		default="simple">
+<cfscript>
+	// get a list of all CFCs in this folder whose name looks like "XXXTest.cfc"
+	// And turn it into compnent path relative to the web root
+	url.bundles = directoryList(
+			path=expandPath( '/' ),
+			filter='*Test.cfc' )
+		.map( function( path ) {
+			return path
+					.replaceNoCase( expandPath( '/' ), '' )
+					.left( -4 )
+		} )
+		.toList();
+</cfscript>
+
+<!--- Ensure TestBox --->
+<cfif fileExists( "/testbox/system/runners/HTMLRunner.cfm" )>
+	<!--- Include the TestBox HTML Runner --->
+	<cfinclude template="/testbox/system/runners/HTMLRunner.cfm">
+<cfelse>
+	Oops, you don't have TestBox installed yet! Please run <b>box install</b> from the root of your excercise folder and refresh this page.	
+</cfif>