public Void VisitClassStmt(Stmt.Class stmt)
{
ClassType enclosingClass = currentClass;
currentClass = ClassType.CLASS;
Declare(stmt.name);
Define(stmt.name);
if (stmt.baseclass != null && stmt.name.Lexeme.Equals(stmt.baseclass.name.Lexeme))
{
ElizScriptCompiler.Error(stmt.baseclass.name, "A class cannot inherit from itself.");
}
if (stmt.baseclass != null)
{
currentClass = ClassType.SUBCLASS;
Resolve(stmt.baseclass);
}
if (stmt.baseclass != null)
{
BeginScope();
scopes.Last()["base"] = true;
}
BeginScope();
scopes.Last()["this"] = true;
foreach (Stmt.Function method in stmt.methods)
{
FunctionType declaration = FunctionType.METHOD;
if (method.name.Lexeme.Equals("init"))
{
declaration = FunctionType.INITIALIZER;
}
ResolveFunction(method, declaration);
}
EndScope();
if (stmt.baseclass != null)
{
EndScope();
}
currentClass = enclosingClass;
return(null);
}
public Void VisitClassStmt(Stmt.Class stmt)
{
object baseclass = null;
if (stmt.baseclass != null)
{
baseclass = Evaluate(stmt.baseclass);
if (!(baseclass is ElizClass))
{
throw new RuntimeError(stmt.baseclass.name, "Baseclass must be a class.");
}
}
environment.Define(stmt.name.Lexeme, null);
if (stmt.baseclass != null)
{
environment = new Environment(environment);
environment.Define("base", baseclass);
}
Dictionary <string, ElizFunction> methods = new Dictionary <string, ElizFunction>();
foreach (Stmt.Function method in stmt.methods)
{
ElizFunction function = new ElizFunction(method, environment, method.name.Lexeme.Equals("init"));
methods[method.name.Lexeme] = function;
}
ElizClass klass = new ElizClass(stmt.name.Lexeme, (ElizClass)baseclass, methods);
if (baseclass != null)
{
environment = environment.enclosing;
}
environment.Assign(stmt.name, klass);
return(null);
}