static void ExecuteVarDecl(VarDeclCmd cmd)
{
if (Memory.Exists(cmd.varName))
{
Console.WriteLine(cmd.varName + " is already declared");
}
else
{
var value = new Memory.Variable();
if (cmd.initializer != null)
{
value = ExpressionEvaluator.Evaluate(cmd.initializer);
}
switch (cmd.scope)
{
case VarDeclCmd.Scope.GLOBAL:
Memory.SaveGlobal(cmd.varName, value);
break;
case VarDeclCmd.Scope.LOCAL:
Memory.Save(cmd.varName, value);
break;
}
}
}
static Command CreateVarDeclCommand(ParsingInfo info)
{
VarDeclCmd cmd = new VarDeclCmd();
var scopeToken = info.MandatoryToken <IdToken>("scope");
switch (scopeToken.Value)
{
case "local":
cmd.scope = VarDeclCmd.Scope.LOCAL;
break;
case "global":
cmd.scope = VarDeclCmd.Scope.GLOBAL;
break;
}
var varNameToken = info.MandatoryToken <IdToken>("varName");
cmd.varName = varNameToken.Value;
var init = info.GetChild("VarInit");
if (init != null)
{
var expr = init.MandatoryChild("expr");
cmd.initializer = CreateExpression(expr);
}
return(cmd);
}
