将CFG上下文无关文法，转换为PDA，并在程序中显示图形，还可以保存结果为图片-CFG context-free grammar, convert the PDA display graphics program, you can also save the results as a picture

该源码是用编译原理中的上下文无关文法来做的可编程计算器，对于研究上下文无关文法有很大的帮助-The source code is compiled with the principle of context-free grammar as programmable calculators, the study of context-free grammar has a lot of help

Generates mock philosophy based on a context-free grammar-Kant Generator for Python