public LoxFunctionCallable Bind(LoxInstance instance)
{
var binding = new LoxEnvironment(_closure);
binding.Bind(instance);
return(new LoxFunctionCallable(_functionStmt, binding, _isInitializer));
}
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 void Execute(IEnumerable <Stmt> statements, LoxEnvironment customEnvironment)
{
var holding = _currentEnvironment;
try {
_currentEnvironment = customEnvironment;
foreach (var innerStmt in statements)
{
Execute(innerStmt);
}
} finally {
_currentEnvironment = holding;
}
}
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 LoxEnvironment()
{
_enclosingEnvironment = null;
_state = new Dictionary <string, object>();
}
public LoxEnvironment(LoxEnvironment environment)
{
_enclosingEnvironment = environment;
_state = new Dictionary <string, object>();
}
public LoxFunctionCallable(FunctionStmt stmt, LoxEnvironment closure, bool isInitializer = false)
{
_functionStmt = stmt;
_closure = closure;
_isInitializer = isInitializer;
}