Handle user inputs and ensure that commands are valid. Update robot_spec

Author: SelenaSmall

lib/handle_input.rb

@@ -0,0 +1,44 @@
+# HandleInput class
+class HandleInput
+  attr_accessor :robot, :table
+
+  def initialize(robot, table)
+    @robot = robot
+    @table = table
+  end
+
+  # Interpret user Command
+  def interpret(command)
+    # Valid command patterns
+    # TODO: Add direction to place command
+    place = /^PLACE\s+\d+\s*,\s*\d+\s*$/
+    move = /^MOVE$/
+    left = /^LEFT$/
+    right = /^RIGHT$/
+    report = /^REPORT$/
+
+    if place.match?(command)
+      command, x, y = command.tr(',', ' ').split
+
+      position = @robot.place(x.to_i, y.to_i)
+
+      # Only update robot if the position is valid on the table
+      robot.update_robot(position) if @table.valid_position?(position.x, position.y)
+
+      puts "CMD: #{command} #{position.x},#{position.y}"
+
+      return "#{command} #{position.x},#{position.y}" unless robot.not_in_place?
+          end
+
+    # PLACE is the only valid command unless robot is in place
+    return if robot.not_in_place?
+
+    puts 'moving' if move.match?(command)
+
+    puts 'turn left' if left.match?(command)
+
+    puts 'turn right' if right.match?(command)
+
+    puts 'reporting' if report.match?(command)
+  end
+end

lib/robot.rb

@@ -9,14 +9,8 @@ def intialize
   end
 
   # Place the robot
-  def place(command)
-    place = /^PLACE\s+\d+\s*,\s*\d+\s*$/
-
-    if place.match?(command)
-      command, x, y = command.tr(',', ' ').split
-
-      Position.new(x.to_i, y.to_i)
-    end
+  def place(x, y)
+    Position.new(x, y)
   end
 
   # Update the robot's position

spec/handle_input_spec.rb

@@ -0,0 +1,36 @@
+require 'rspec'
+require 'spec_helper'
+require './lib/handle_input'
+
+describe HandleInput do
+  describe '#initialize' do
+    it 'should have a robot attribute which is nil' do
+      instance = HandleInput.new(@robot, @table)
+
+      expect(instance.robot).to be_nil
+    end
+
+    it 'should have a table attribute which is nil' do
+      instance = HandleInput.new(@robot, @table)
+
+      expect(instance.table).to be_nil
+    end
+  end
+
+  describe '#interpret' do
+    it 'should return a string if command matches place pattern' do
+      instance = HandleInput.new(Robot.new, Table.new)
+      command = 'PLACE 1,2'
+
+      expect(instance.interpret(command)).to be_a String
+      expect(instance.interpret(command)).to match(/^PLACE\s+\d+\s*,\s*\d+\s*$/)
+    end
+
+    it 'should return nil if command does not match a valid pattern' do
+      instance = HandleInput.new(Robot.new, Table.new)
+      command = 'hello'
+
+      expect(instance.interpret(command)).to be_nil
+    end
+  end
+end

spec/robot_spec.rb

@@ -15,22 +15,7 @@
     it 'should return an instance of Position' do
       instance = Robot.new
       command = 'PLACE 1,2'
-
-      expect(instance.place(command)).to be_a Position
-    end
-
-    it 'should return nil if command is empty' do
-      instance = Robot.new
-      command = ''
-
-      expect(instance.place(command)).to be_nil
-    end
-
-    it 'should return nil if command does not match the place pattern' do
-      instance = Robot.new
-      command = 'get'
-
-      expect(instance.place(command)).to be_nil
+      expect(instance.place(0, 0)).to be_a Position
     end
   end
 

toy_robot.rb

@@ -2,6 +2,7 @@
 
 require_relative './lib/table'
 require_relative './lib/robot'
+require_relative './lib/handle_input'
 
 table = Table.new
 robot = Robot.new
@@ -11,14 +12,10 @@
   puts 'Select your command'
   input = gets.chomp
 
-  unless input == 'EXIT'
-    position = robot.place(input)
-    # Only update robot if the position is valid on the table
-    robot.update_robot(position) if table.valid_position?(position.x, position.y)
+  unless /^EXIT$/.match?(input)
+    command = HandleInput.new(robot, table)
 
-    puts "Position: #{position.x},#{position.y}"
-
-    puts 'placed' unless robot.not_in_place?
+    command.interpret(input)
     next
   end