https://github.com/oriontransfer/PL0-Language-Tools

An implementation of PL/0 including a tree-based interpreter and virtual machine.
https://github.com/oriontransfer/PL0-Language-Tools

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An implementation of PL/0 including a tree-based interpreter and virtual machine.

• Host: GitHub
• URL: https://github.com/oriontransfer/PL0-Language-Tools
• Owner: oriontransfer
• Created: 2011-05-23T11:08:08.000Z (over 13 years ago)
• Default Branch: master
• Last Pushed: 2023-12-17T14:50:22.000Z (9 months ago)
• Last Synced: 2024-06-20T08:06:26.836Z (3 months ago)
• Language: Python
• Homepage: http://programming.dojo.net.nz/study/pl0-language-tools/index
• Size: 509 KB
• Stars: 74
• Watchers: 7
• Forks: 25
• Open Issues: 2
• Metadata Files:
  • Readme: README.md

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README

        
# PL/0 Language Tools

The PL/0 Language Tools serve as an example of how to construct a

compiler. The language 'PL/0' was originally introduced in the book

"Algorithms + Data Structures = Programs", by Niklaus Wirth in 1975.

![Overview](Overview.png)

This project includes a full stack of tools designed for educational

purposes to learn about compilers, interpreters and virtual machines.

Each component can be executed independently and is typically between

100-300 lines of code.

It is designed to be clear and concise at the expense of performance. It

is easy to extend and modify, e.g. adding new syntax constructs or

machine instructions.

## Installation

Install ply:

	sudo easy_install ply

Then, simply download the files `pl0_*.py` and run them.

## Basic Usage

Here is a full example using the interpreter:

	$ ./pl0_interpreter.py < examples/fibonacci.pl1

	1

	1

	2

	3

	5

	8

	13

	21

	34

	55

	89

	144

	233

	377

	610

	987

	1597

	2584

	4181

	6765

	10946

	-- Stack Frame --

	Constants: {'K': 20}

	Variables: {'count': 21, 'k': 17711, 'm': 17711, 'n': 28657}

	Procedures: {}

If you want to see a abstract syntax tree of your program, use the pl0_graphviz.py command:

	./pl0_graphviz.py < examples/fibonacci.pl1

A sample graph is included in the `examples` directory.

For more advanced usage, including documentation on individual components, please see the [online documentation](http://programming.dojo.net.nz/study/pl0-language-tools/index).

## Cross Compiling

Recent development adds several new compiler targets. I'm interested in the possibility of cross compiling PL/0 to other languages; most of my work on this targets this.

I (Charles) am working on cross compilers for several stack based languages, including Retro, Parable, and ANS FORTH.

## License

Copyright, 2012, by Samuel G. D. Williams.   

Copyright, 2012, by Michal J Wallace.   

Copyright, 2012, 2016, 2017 by Charles Childers   

Permission is hereby granted, free of charge, to any person obtaining a copy

of this software and associated documentation files (the "Software"), to deal

in the Software without restriction, including without limitation the rights

to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

copies of the Software, and to permit persons to whom the Software is

furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in

all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

THE SOFTWARE.