1.2 KiB
Nasal Interpreter
Nasal
Nasal is a script language that used in FlightGear.
There is a Nasal console in FlightGear but sometimes it is not so easy for every developer to use.
So this is an interpreter for Nasal written by C++.
The interpreter is still in development.Anyone who interested in this could also join us!
Now complete add and sub in abstract syntax tree
And add a command 'ast' to see the AST
and command 'run' can give you the result
Now complete Lexical Analysis!
What do it's outputs look like?
( Identifier | engineTimer )
( Operator | . )
( Identifier | start )
( Operator | ( )
( Operator | ) )
( Operator | ; )
( ReserveWord | print )
( Operator | ( )
( String | "Engine started" )
( Operator | ) )
( Operator | ; )
This is what it outputs.
Push down automata
After many times of failure,i finally try to use PDA to do the parse work.
But something occurred,so i finally didn't make it.However you can still see this LL(1) and LR(0) parser in version 0.7 & 0.9
Now complete Parser
The parser can recognize some basic elements in resource program.
And in future i will make it to support more flexible grammar.