Top-Down Parser and Lexical Analyzer for Entity-Relationship Diagrams (Compiler)

software function:

1-write a text to describe textually an entity-relationship diagram

2-open and read file that contains a descriprion of an entity-relationship diagram

3-compile lexically and syntactically the inputs using Top Down Method

4-show the first set and foolow set ,top down predictive table and the parse tree of the inputs