https://github.com/mahdavipanah/pycfg

Context Free Grammar(CFG) parser library and application written in Python.
https://github.com/mahdavipanah/pycfg

algorithm automata cfg python tkinter

Last synced: 25 days ago
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Context Free Grammar(CFG) parser library and application written in Python.

• Host: GitHub
• URL: https://github.com/mahdavipanah/pycfg
• Owner: mahdavipanah
• License: mit
• Created: 2017-01-07T08:52:05.000Z (almost 8 years ago)
• Default Branch: master
• Last Pushed: 2023-11-22T15:44:50.000Z (about 1 year ago)
• Last Synced: 2024-04-09T16:42:43.493Z (9 months ago)
• Topics: algorithm, automata, cfg, python, tkinter
• Language: Python
• Homepage:
• Size: 97.7 KB
• Stars: 18
• Watchers: 3
• Forks: 8
• Open Issues: 2
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
pyCFG is an application and library for working with context free grammars (CFG) in [Python](https://www.python.org/).

It uses [tkinter](https://wiki.python.org/moin/TkInter) for it's graphical interface.



  



## Installing application

### Prerequisites

- [Python3.5+](https://www.python.org/)

- [tkinter](https://wiki.python.org/moin/TkInter)

### Running

```bash

$ python pycfg.py

```

### Windows

You can download pyCFG's binary for windows from [Here](https://github.com/mahdavipanah/pyCFG/releases).

## Using library

pyCFG library is in `cfg.py` module and can be imported and be used easily. For example:

```Python

from cfg import CFG

g = CFG(terminals={'a', 'b', 'c', 'λ'},

        rules={'S': ['aSa', 'bSb', 'cSc', 'λ']}

        )

string = input("Enter a string: ")

if g.cyk(string):

    print("Grammar can generate the string!")

else:

    print("Grammar cannot generate the string!")

```

Above program gets a string from input and tells if the defined grammer can generate the string or not.

## Tests

If you want to test, make sure that `pytest` is installed, then run:

~~~bash

pytest test.py

~~~

## Author

Hamidreza Mahdavipanah

### Contributors

- Lucas Seiki Oshiro

## License

[MIT](./LICENSE)