Rendering the DFA requires the Graphviz library: https://pypi.python.org/pypi/graphviz
Users may pass an input grammar as a string with the following format:
N -> prod1 | prod2 | ...
Where N is a nonterminal and prod is a production of N.
Unique symbols must be separated by whitespace. Aa != A a
Nullable productions may be represented with λ or the keyword LAMBDA.
E.g.
grammar=\
"""
S -> A | B
A -> a b c
B -> identifier
"""
Output:
Pass the grammar to an instance of DFA and the automaton will be constructed!
Calling DFA.render() produces a GV file and a file of whichever format the user
passes (defaults to SVG).