TRS: Toy Robot Simulator
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README.md

TRS

This is an implementation of the Toy Robot Simulator.

Installation (Local)

Build the gem from the gemspec:

$ gem build trs.gemspec

Install the gem:

$ gem install trs

Usage

Interactive Mode

Run interactively via command line input:

$ trs play

Specify table dimensions:

$ trs play -l=10 -w=10

Auto-report position after every command:

$ trs play -r=true

Commands while inside interactive mode:

  • PLACE - Specifies position of robot in X,Y,F format. i.e. : PLACE 1,1,SOUTH
  • MOVE - Moves robot X unit forward in the direction it is currently facing i.e. : MOVE or MOVE 2
  • LEFT - Rotates robot 90 degrees to the left
  • RIGHT - Rotates robot 90 degrees to the right
  • REPORT - Shouts the current position
Output Mode

Run by feeding a series of commands thru a file:

$ trs output [PATH TO FILE]

Specify table dimensions:

$ trs output [PATH TO FILE] -l=10 -w=10

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

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/katpadi/trs.

License

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