maux_robot

Maux version of a Toy Robot Simulator in Ruby

• 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.

This is an application that can read in commands of the following form:

PLACE X,Y,F
MOVE
LEFT
RIGHT
REPORT [csv|json]
VERBOSE

• 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. If csv or json is passed, it formats the whereabouts accordingly. The default format is csv.

• VERBOSE will turn the error messages (talkative mode) on or off. The robot starts with talkative mode set to off.

• A robot that is not on the table ignores the MOVE, LEFT, RIGHT and REPORT commands.

The toy robot does 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 is ignored.

gem install maux_robot

Example Input and Output:

# Example a
echo "PLACE 0,0,NORTH
MOVE
REPORT" | maux_robot
# Output: 0,1,NORTH

# Example b
echo "PLACE 0,0,NORTH
LEFT
REPORT" | maux_robot
# Output: 0,0,WEST

# Example c
echo "PLACE 1,2,EAST
MOVE
MOVE
LEFT
MOVE
REPORT" | maux_robot
# Output: 3,3,NORTH

# Example d
cat script_file | maux_robot

The Toy Robot Challenge was originally formulated by Jon Eaves

Mauricio Vieira (mauriciovieira)

• http://mauriciovieira.net
• https://twitter.com/mauriciovieira
• https://github.com/mauriciovieira