public AST(MiniPLGrammar grammar, SyntaxTree tree)
{
errors = new List <String>();
currentConstants = new HashSet <String>();
vars = new Dictionary <String, Variable>();
this.grammar = grammar;
root = parse(tree.root);
if (errors.Count > 0)
{
throw new SemanticError(errors);
}
}
static void interpret(String program)
{
System.Console.WriteLine("Parsing");
MiniPLGrammar g = new MiniPLGrammar();
AST ast;
try
{
ast = new AST(g, g.parse(program));
} //these exceptions are the user's fault
catch (SemanticError e)
{
System.Console.WriteLine("Error parsing program\n" + e.Message);
return;
}
catch (ParseError e)
{
System.Console.WriteLine("Error parsing program\n" + e.Message);
return;
}
catch (ScannerException e)
{
System.Console.WriteLine("Error parsing program\n" + e.Message);
return;
}
//every other exception is a bug in this program
System.Console.WriteLine("Interpreting");
Interpreter inter = new Interpreter();
try
{
inter.run(ast);
}
catch (InterpreterException e) //user's fault
{
System.Console.WriteLine("Error interpreting program: " + e.Message);
return;
}
//everything else is a bug
System.Console.WriteLine("");
System.Console.WriteLine("Done interpreting");
}