#Toy Robot Simulator

Having a go at the Toy Robot Test.

• Interface

  • Only exists to capture input and display menu

• Command

  • verifies command
    • resets instruction value
    • formats command
    • checks that the command is a valid one
    • if command is place, checks that the subsequent string is valid
    • if robot isn't yet placed, reject any other command
    • set command instruction value to valid command
  • executes command

• Robot

• can be placed

• can be turned

• can report whereabouts

• has a set of valid directions to validate against

• can move (where table allows)

• Table

  • has a min and max value for x and y coordinates
  • validates a position against the min / max x / y coordinates

• Messages

  • Formats and displays output from Robot (more user friendly)

Running the program

• Download
• Navigate to root directory
• run ruby run.rb

##Todo

• Write tests for interface.rb (didn't think they would really be required until I did it)

Description:

The application is a simulation of a toy robot moving on a square tabletop, of dimensions 5 units x 5 units. There are no other obstructions on the table surface. The robot is free to roam around the surface of the table, but must be prevented from falling to destruction. Any movement that would result in the robot falling from the table must be prevented, however further valid movement commands must still be allowed.

Create an application that can read in commands of the following form –

• PLACE X,Y,F
• MOVE
• LEFT
• RIGHT
• REPORT

PLACE will put the toy robot on the table in position X,Y and facing NORTH, SOUTH, EAST or WEST. The origin (0,0) can be considered to be the SOUTH WEST most corner. The first valid command to the robot is a PLACE command, after that, any sequence of commands may be issued, in any order, including another PLACE command. The application should discard all commands in the sequence until a valid PLACE command has been executed. MOVE will move the toy robot one unit forward in the direction it is currently facing. LEFT and RIGHT will rotate the robot 90 degrees in the specified direction without changing the position of the robot. REPORT will announce the X,Y and F of the robot. This can be in any form, but standard output is sufficient.

A robot that is not on the table can choose the ignore the MOVE, LEFT, RIGHT and REPORT commands. Input can be from a file, or from standard input, as the developer chooses. Provide test data to exercise the application.

Constraints:

The toy robot must not fall off the table during movement. This also includes the initial placement of the toy robot. Any move that would cause the robot to fall must be ignored.

Example Input and Output:

• a) PLACE 0,0,NORTH MOVE REPORT Output: 0,1,NORTH

• b) PLACE 0,0,NORTH LEFT REPORT Output: 0,0,WEST

• c) PLACE 1,2,EAST MOVE MOVE LEFT MOVE REPORT Output: 3,3,NORTH