Compiler Tools

This tool reads grammar input in a syntax which is similar to Lemon Parser.

The head of first production is assumed to be the start symbol.

Following is the example 4.27 from the Dragon Book written in Lemon parser syntax:

e ::= t erhs.
erhs ::= ADD t erhs.
erhs ::= .
t ::= f trhs.
trhs ::= TIMES f trhs.
trhs ::= .
f ::= LP e RP.
f ::= ID.