This is html and javascript interpreter written in python.

parser_complete.py -> has complete code for parser.

isambig.py -> tests whether grammer is ambigious or not

js_lexical_analyser.py -> contains complete Javascript lexer

html_lexical_analyser.py -> contains complete HTML lexer.

cfg_empty.py -> tests whether a given context-free grammar is empty or not.

cfg_infinite.py -> tests whether a given context-free grammer is infinite or not.