README excerpt
Toy Robot Simulator
===================
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.
- The application must be a command line 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
------------------------
### Example a
PLACE 0,0,NORTH
MOVE
REPORT
Expected output:
0,1,NORTH
### Example b
PLACE 0,0,NORTH
LEFT
REPORT
Expected output:
0,0,WEST
### Example c
PLACE 1,2,EAST
MOVE
MOVE
LEFT
MOVE
REPORT
Expected output
3,3,NORTH
Deliverables
------------
Please provide your source code, and any test code/data you using in
developing your solution.
Please engineer your solution to a standard you consider suitable for
production. It is not required to provide any graphical output showing the
movement of the toy robot.
Please do not put your name in any of the submitted code since this makes it
harder for us to review your submission anonymously.
Usage
-----
To use the `toy-robot` application, either execute the script and start typing
in commands; e.g.
```shell
$ bin/app
REPORT
"0,0,NORTH"
PLACE 1,2,SOUTH
REPORT
"1,2,SOUTH"
MOVE
MOVE
RIGHT
REPORT
"1,0,WEST"
EXIT
```
All given User inputs should match what was specified in the Toy Robot
specification; meaning its case-sensitive, ignores invalid commands, reports
back to the user when asked `REPORT`, etc. However, it also implements a `EXIT`
command in order escape the application/script outside of the regular terminate
command `Ctrl + C`.
Caveats
-------
- The square tabletop, of dimensions 5 units x 5 units, assumes a Range of
`(0...5)` not `(0..5)`; e.g.
```ruby
(0...5).to_a # => [0, 1, 2, 3, 4]
(0...5).count # => 5
(0..5).to_a # => [0, 1, 2, 3, 4, 5]
(0..5).count # => 6
```
Since counting starts at `0` from the origin, it means the fifth value would
be `4` not `5` (which in this case would be the sixth value and create a
tabletop of 6 x 6 units, with 36 possible positions, rather than 25).
Contributing
------------
Bug reports and pull requests are welcome on GitHub at
https://github.com/Sonna/toy-robot-smalltalk.
## References:
- [GNU Smalltalk User’s Guide]
(https://www.gnu.org/software/smalltalk/manual/gst.html)
- [smalltalk/SUnitTests\.st at master · gnu\-smalltalk/smalltalk]
(https://github.com/gnu-smalltalk/smalltalk/blob/master/packages/sunit/SUnitTests.st)
- [smalltalk/packages at master · gnu\-smalltalk/smalltalk]
(https://github.com/gnu-smalltalk/smalltalk/tree/master/packages)