Mrrobot - toy robot simulator

• The application was written as an exercise and 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.

Installation

Build the gem:

$ gem build mrrobot.gemspec

Install the gem:

$ gem install --local mrrobot-0.1.0.gem

Usage

mrrobot -f <path_to_example_file>

Examples

Example files are located inside examples directory.

Specs and style

rake spec

rubocop

Documentation

As a project I am pretty unhappy because I'm lacking documentation :( I'm going to have a serious discussion with the developer regarding this matter!

Application requirements

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 to ignore the MOVE, LEFT, RIGHT and REPORT commands.

• Input is taken from a file.

• Provide test data to exercise the application.

• It is not required to provide any graphical output showing the movement of the toy robot.

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:

# Example a
PLACE 0,0,NORTH
MOVE
REPORT
# Output: 0,1,NORTH

# Example b
PLACE 0,0,NORTH
LEFT
REPORT
# Output: 0,0,WEST

# Example c
PLACE 1,2,EAST
MOVE
MOVE
LEFT
MOVE
REPORT
# Output: 3,3,NORTH

Acknowledgement

The Toy Robot Challenge was originally formulated by Jon Eaves

License

The gem is available as open source under the terms of the MIT License.