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 orientation of the robot.
A robot that is not on the table can choose to ignore the MOVE, LEFT, RIGHT and REPORT commands.
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
Deliverables: The source files, the test data and any test code.
Add this line to your application's Gemfile:
gem 'toy_robot'And then execute:
$ bundle
Or install it yourself as:
$ gem install toy_robot
The application also reads a file using a name passed in the command line.
$ toy_robot commands.txt
commands.txt content:
PLACE 0,0,NORTH MOVE MOVE MOVE MOVE MOVE REPORT
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.
Bug reports and pull requests are welcome on GitHub at https://github.com/refactor8/toy_robot. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.
The gem is available as open source under the terms of the MIT License.
Everyone interacting in the ToyRobot project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.