Copyright (C) 1994, Digital Equipment Corp.
Created on Tue Jan 19 14:00:00 PST 1994 by najork
MODULE ObBoxGO;
IMPORT BoxGO, BoxGOProxy, ObAux, ObCommand, ObGO, ObLib, ObPointProp, ObProp,
ObProtoLoader, ObSurfaceGO, ObValue, Obliq, ProxiedObj, SynLocation;
CONST
pkgname = "BoxGO";
***************************************************************************
Wrapper for BoxGO.T
***************************************************************************
TYPE
T = ObSurfaceGO.T BRANDED "ObBoxGO.T" OBJECT END;
PROCEDURE AddTObj (box : BoxGO.T) =
<* FATAL ObValue.Error, ObValue.Exception *>
BEGIN
WITH obj = Obliq.ObjectClone (Obliq.Vals {TProto}),
raw = NEW (T, what := "<a BoxGO.T>", po := box) DO
Obliq.ObjectUpdate (obj, "raw", raw);
box.proxy := NEW (ProxiedObj.Proxy, obj := obj);
END;
END AddTObj;
***************************************************************************
Setup procedures
***************************************************************************
PROCEDURE SetupPackage () =
PROCEDURE NewOpCode (name: TEXT; arity: INTEGER; code: Code) : OpCode =
BEGIN
RETURN NEW (OpCode, name := name, arity := arity, code := code);
END NewOpCode;
TYPE
OpCodes = ARRAY OF ObLib.OpCode;
VAR
opCodes: REF OpCodes;
BEGIN
opCodes := NEW (REF OpCodes, NUMBER (Code));
opCodes^ :=
OpCodes {
NewOpCode ("New", 2, Code.New),
NewOpCode ("Corner1", -1, Code.Corner1),
NewOpCode ("Corner2", -1, Code.Corner2),
NewOpCode ("SetCorner1", 2, Code.SetCorner1),
NewOpCode ("SetCorner2", 2, Code.SetCorner2)
};
ObLib.Register (NEW (Package, name := pkgname, opCodes := opCodes));
ObLib.RegisterHelp (pkgname, Help);
(* DONT KNOW YET WHETHER TO INHIBIT TRANSMISSIONS ... *)
END SetupPackage;
VAR
TProto : ObValue.Val;
PROCEDURE SetupModule (loader : ObProtoLoader.T) =
BEGIN
(*** Retrieve the prototype ***)
loader.load ("BoxGO.obl");
TProto := loader.get ("BoxGO_TProto");
(*** Register the proxy maker ***)
BoxGOProxy.MkProxyT := AddTObj;
END SetupModule;
***************************************************************************
Execution machinery
***************************************************************************
TYPE
Code = {New, Corner1, Corner2, SetCorner1, SetCorner2};
OpCode = ObLib.OpCode OBJECT
code: Code;
END;
Package = ObLib.T OBJECT
OVERRIDES
Eval := DoEval;
END;
PROCEDURE DoEval (self : Package;
opCode : ObLib.OpCode;
<* UNUSED *> arity : ObLib.OpArity;
READONLY args: ObValue.ArgArray;
<* UNUSED *> temp : BOOLEAN;
loc : SynLocation.T) : ObValue.Val
RAISES {ObValue.Error, ObValue.Exception} =
BEGIN
CASE NARROW (opCode, OpCode).code OF
| Code.New =>
WITH a = ObPointProp.GetOverloadedVal (args, 1, self, opCode, loc),
b = ObPointProp.GetOverloadedVal (args, 2, self, opCode, loc),
box = NEW (BoxGO.T).init () DO
box.setProp (BoxGO.Corner1.bind (a));
box.setProp (BoxGO.Corner2.bind (b));
RETURN box.proxy.obj;
END;
| Code.Corner1 =>
RETURN ObProp.NameToObliq (BoxGO.Corner1);
| Code.Corner2 =>
RETURN ObProp.NameToObliq (BoxGO.Corner2);
| Code.SetCorner1 =>
WITH go = ObGO.GetArg (args, 1, self, opCode, loc),
p = ObPointProp.GetOverloadedVal (args, 2, self, opCode, loc) DO
go.setProp (BoxGO.Corner1.bind (p));
RETURN ObValue.valOk;
END;
| Code.SetCorner2 =>
WITH go = ObGO.GetArg (args, 1, self, opCode, loc),
p = ObPointProp.GetOverloadedVal (args, 2, self, opCode, loc) DO
go.setProp (BoxGO.Corner2.bind (p));
RETURN ObValue.valOk;
END;
END;
END DoEval;
***************************************************************************
Help
***************************************************************************
PROCEDURE Help (self : ObCommand.T; arg : TEXT; <* UNUSED *> data : REFANY) =
BEGIN
ObAux.Help (self, arg, pkgname);
END Help;
BEGIN
END ObBoxGO.