// Compiles a variable name or method call with an implicit receiver.
private static void Name(Compiler c, bool allowAssignment)
{
// Look for the name in the scope chain up to the nearest enclosing method.
Token token = c._parser.Previous;
Instruction loadInstruction;
string varName = c._parser.Source.Substring(token.Start, token.Length);
int index = c.ResolveNonmodule(varName, token.Length, out loadInstruction);
if (index != -1)
{
c.Variable(allowAssignment, index, loadInstruction);
return;
}
// TODO: The fact that we return above here if the variable is known and parse
// an optional argument list below if not means that the grammar is not
// context-free. A line of code in a method like "someName(foo)" is a parse
// error if "someName" is a defined variable in the surrounding scope and not
// if it isn't. Fix this. One option is to have "someName(foo)" always
// resolve to a self-call if there is an argument list, but that makes
// getters a little confusing.
// If we're inside a method and the name is lowercase, treat it as a method
// on this.
if (IsLocalName(varName) && c.GetEnclosingClass() != null)
{
c.LoadThis();
c.NamedCall(allowAssignment, Instruction.Call0);
return;
}
// Otherwise, look for a module-level variable with the name.
int module = c._parser.Module.Variables.FindIndex(v => v.Name == varName);
if (module == -1)
{
if (IsLocalName(varName))
{
c.Error("Undefined variable.");
return;
}
// If it's a nonlocal name, implicitly define a module-level variable in
// the hopes that we get a real definition later.
module = c._parser.Vm.DeclareVariable(c._parser.Module, varName);
if (module == -2)
{
c.Error("Too many module variables defined.");
}
}
c.Variable(allowAssignment, module, Instruction.LoadModuleVar);
}
