public InterpretingVisitor()
{
GlobalEnvironment = new LoxEnvironment();
_assertions = new List <LoxAssertionResult>();
_scopeMap = new Dictionary <Expr, int>();
_currentEnvironment = GlobalEnvironment;
var start = DateTime.UtcNow.Ticks;
GlobalEnvironment.Define("clock", new LoxNativeCallable(0, (args) => (double)(DateTime.UtcNow.Ticks - start) / 10000));
GlobalEnvironment.Define("assert", AssertLoxNativeCallable.CreateAssertLoxNativeCallable(_assertions));
GlobalEnvironment.Define("stringify", new LoxNativeCallable(1, (arg) => arg[0]?.ToString() ?? "nil"));
}
public object Call(InterpretingVisitor interpreter, List <object> arguments)
{
var environment = new LoxEnvironment(_closure);
for (var i = 0; i < Arity(); i++)
{
environment.Define(_functionStmt.Params[i].Lexeme, arguments[i]);
}
try {
interpreter.Execute(_functionStmt.Body, environment);
} catch (LoxReturnException ex) {
if (_isInitializer)
{
throw new LoxReturnException(_closure.GetAt(0, new Token(TokenType.This, "this", null, 0)));
}
throw;
}
return(null);
}
public void Visit(FunctionStmt stmt)
{
var callable = new LoxFunctionCallable(stmt, _currentEnvironment);
_currentEnvironment.Define(stmt.Name.Lexeme, callable);
}
