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+# Piet interpreter
+Piet is an esoteric programming language, which is based on the geometric artist Piet Mondriaan. The language specifies actions based on the transitions of colors. For a detailed explanation, please visit [the official website](https://www.dangermouse.net/esoteric/piet.html)
+
+_Note: I used the term codel as a synonym for color block throught the code._
+
+## Requirements
+The program requires the following libraries to be installed:
+- [Python pillow](https://pillow.readthedocs.io/en/stable/), used for loading images
+- [Numpy](https://numpy.org/), used for managing images
+- [Pygubu](https://pypi.org/project/pygubu/), used by the GUI
+
+## Features
+This interpreter can do the following:
+- Custom errors for unknown colors, unknown tokens, unknown commands and when starting in a black pixel
+- Run .png images
+- Run .gif images
+- Number of steps taken
+- A Graphical User Interface:
+    - Step-by-step execution of the program
+        - Information about the selected codel
+        - Information about the stack
+        - Information about the direction
+    - Visual representation of the program
+    - Can open files without restarting the GUI
+    - Can scale images, to better visualize the program
+
+
+### Must-haves
+The must-haves are implemented as follows:
+- Classes are implemented as Tokens, Errors and data structures
+- Inheritance is implemented with Tokens and Errors
+- Object printing is implemented with both \_\_str__ and \_\_repr__ functions
+- A decorator is used to provide additional info when running the interpreter with the ```-v``` command
+- The entire program (Except for the GUI) is programmed according to the FP programming paradigm
+- All functions (Except for the GUI) are type-annotated using the python typing module
+- The following higher-order functions are used:
+    - Map
+    - Filter
+    - Max
+    - Min
+
+### Should-haves
+This interpreter implemented the following should-haves:
+- Custom error messaging in both the Lexing and running steps of the interpreter, for example: detailing which colors at which positions are unknown
+- Visualisation through a TKinter GUI, powered by the Pygubu library
+- Advanced Language Features. All Piet commands are implemented, which includes commands such as modulo, stack rolling, and IO
+- Instruction-and-show-off video. Although I haven't made a video, I did make a infographic, detailing how the interpreter works. It can be found [here](#interpreter-infographic)
+
+## Limitations
+Too large images will cause the stack to overflow. The maximum size of the image is dependent on the contents.
+The interpreter also can't distinguish between images with differen pixel-sizes. Due to the nature of Piet, enlarging an image will cause the interpreter to produce different results
+
+
+## Parameters
+The main.py file in the root directory should be used to interface with the interpreter. Each parameter that can be used will be explained here.
+
+#### Help
+The help parameter shows all parameters from the commandline, and can be set as follows
+```cmd
+python main.py -h
+python main.py --help
+```
+
+#### File
+This is a required parameter, and is a path to the image that should be interpreted. The test-images provided in the repository can be interpreted as follows:
+```cmd
+python main.py -f Countdown.png
+python main.py --file Countdown.png
+
+/output 
+10
+9
+8
+7
+6
+5
+4
+3
+2
+1
+
+```
+
+#### Verbose
+Currently the verbose flag outputs the total amount of steps taken for the execution of the image.
+```cmd
+python main.py --file Countdown.py -v
+python main.py --file Countdown.py --verbose
+
+/output
+10
+9
+8
+7
+6
+5
+4
+3
+2
+1
+
+Total steps: 276
+
+```
+
+
+#### Graphical
+The graphical flag opens a GUI, with the given file loaded.
+```cmd
+python main.py --file Countdown.py -g
+python main.py --file Countdown.py --graphical
+```
+This command should open the interface:
+![countdown GUI](/Info/countdown_GUI.PNG)
+
+
+## Interpreter infographic
+![infographic](/Info/poster.png?raw=true)
+
+## Test programs:
+### Add.png
+This program calculates 2+2 and output it to STDOUT
+![Add](/Add.png?raw=true)
+### ColorError.png
+This program encounters an error during lexing, and returns the full list of errors.
+![ColorError](/ColorError.png?raw=true)
+### Countdown.png
+This program counts down from 10 to 1, outputting each number to STDOUT. This program shows how turing-complete the language is by demonstrating arithmetic functionality, boolean algebra and looping/branching.
+![Countdown](/Countdown.png?raw=true)
+### DivideByZero.png
+This program encounters a division by zero error and prints the error to STDOUT
+![DivideByZero](/DivideByZero.png?raw=true)
+### Endless.png
+This program loops endlessly, or until the stack overflows
+![Endless.png](/Endless.png?raw=true)
+### HelloWorld.png
+Outputs Hello World! to STDOUT
+![HelloWorld](/HelloWorld.png?raw=true)
+
+
+