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top - downloadIndex: ┃ B T ┃
Length: 6980 (0x1b44)
Types: TextFile
Names: »B«
└─⟦a7d1ea751⟧ Bits:30000550 8mm tape, Rational 1000, !users!projects 94_04_11
└─ ⟦129cab021⟧ »DATA«
└─⟦this⟧
└─⟦2f6cfab89⟧ Bits:30000547 8mm tape, Rational 1000, !projects 94-01-04
└─ ⟦d65440be7⟧ »DATA«
└─⟦this⟧
└─⟦a7d1ea751⟧ Bits:30000550 8mm tape, Rational 1000, !users!projects 94_04_11
└─ ⟦129cab021⟧ »DATA«
└─⟦e24fb53b7⟧
└─⟦this⟧
package body Generic_Expression is
type Expression_Owners is (System, User);
package System_Defined is
type Operators is ('+', '-', '*', '/', Abs_Op);
function Evaluate (Using_Operator : Operators; Left, Right : Integer)
return Integer;
function Image (Op : Operators) return String;
end System_Defined;
package Primary_Expression is
type Sub_Classes is (Alias_Value, Immediate_Value);
type Object (Kind : Sub_Classes := Immediate_Value) is
record
case Kind is
when Alias_Value =>
The_Alias : Alias.Name;
when Immediate_Value =>
The_Value : Integer;
end case;
end record;
function Value (For_Integer : Integer) return Object;
function Value (For_Alias : Alias.Name) return Object;
procedure Put (The_Object : Object; Where : Output_Stream.Object);
function Evaluate (The_Object : Object) return Integer;
end Primary_Expression;
package Unary_Expression is
type Object (Owner : Expression_Owners := System) is
record
The_Operand : Generic_Expression.Object;
case Owner is
when System =>
The_System_Operator : System_Defined.Operators;
when User =>
The_User_Operator : User_Defined_Operators;
end case;
end record;
function Make (The_Operator : System_Defined.Operators;
The_Operand : Generic_Expression.Object) return Object;
function Make (The_Operator : User_Defined_Operators;
The_Operand : Generic_Expression.Object) return Object;
procedure Put (The_Object : Object; Where : Output_Stream.Object);
function Evaluate (The_Object : Object) return Integer;
end Unary_Expression;
package Binary_Expression is
type Object (Owner : Expression_Owners := System) is
record
The_Left_Operand : Generic_Expression.Object;
The_Right_Operand : Generic_Expression.Object;
case Owner is
when System =>
The_System_Operator : System_Defined.Operators;
when User =>
The_User_Operator : User_Defined_Operators;
end case;
end record;
function Make (The_Operator : System_Defined.Operators;
The_Left_Operand : Generic_Expression.Object;
The_Right_Operand : Generic_Expression.Object)
return Object;
function Make (The_Operator : User_Defined_Operators;
The_Left_Operand : Generic_Expression.Object;
The_Right_Operand : Generic_Expression.Object)
return Object;
procedure Put (The_Object : Object; Where : Output_Stream.Object);
function Evaluate (The_Object : Object) return Integer;
end Binary_Expression;
type Object_Structure (Sub_Class : Sub_Classes) is
record
case Sub_Class is
when Primary =>
The_Primary_Code : Primary_Expression.Object;
when Unary =>
The_Unary_Code : Unary_Expression.Object;
when Binary =>
The_Binary_Code : Binary_Expression.Object;
when Undefined =>
null;
end case;
end record;
function New_Node (For_Code : Object_Structure) return Object is
Result : Object;
begin
Result := new Object_Structure (Sub_Class => For_Code.Sub_Class);
Result.all := For_Code;
return Result;
end New_Node;
function Value (For_Integer : Integer) return Object is
begin
return New_Node ((Sub_Class => Primary,
The_Primary_Code =>
Primary_Expression.Value (For_Integer)));
end Value;
function Value (For_Alias : Alias.Name) return Object is
begin
return New_Node ((Sub_Class => Primary,
The_Primary_Code =>
Primary_Expression.Value (For_Alias)));
end Value;
function Unary_User_Expression (Using_Value : Object) return Object is
The_Code : Unary_Expression.Object;
begin
The_Code := Unary_Expression.Make (Operator, Using_Value);
return New_Node (For_Code => (Sub_Class => Unary,
The_Unary_Code => The_Code));
end Unary_User_Expression;
function Binary_User_Expression (Left, Right : Object) return Object is
The_Code : Binary_Expression.Object;
begin
The_Code := Binary_Expression.Make (Operator, Left, Right);
return New_Node (For_Code => (Sub_Class => Binary,
The_Binary_Code => The_Code));
end Binary_User_Expression;
function Evaluate (The_Expression : Object) return Integer is
begin
if The_Expression = Null_Expression then
return 0;
else
case The_Expression.Sub_Class is
when Primary =>
return Primary_Expression.Evaluate
(The_Expression.The_Primary_Code);
when Unary =>
return Unary_Expression.Evaluate
(The_Expression.The_Unary_Code);
when Binary =>
return Binary_Expression.Evaluate
(The_Expression.The_Binary_Code);
when Undefined =>
raise Illegal_Operation;
end case;
end if;
end Evaluate;
procedure Put (The_Object : Object; Where : Output_Stream.Object) is
use Output_Stream;
begin
if The_Object /= Null_Expression then
case The_Object.Sub_Class is
when Primary =>
Primary_Expression.Put (The_Object.The_Primary_Code, Where);
when Unary =>
Unary_Expression.Put (The_Object.The_Unary_Code, Where);
when Binary =>
Binary_Expression.Put (The_Object.The_Binary_Code, Where);
when Undefined =>
Put ("Undefined expression", Where);
end case;
end if;
end Put;
package body System_Defined is separate;
package body Primary_Expression is separate;
package body Unary_Expression is separate;
package body Binary_Expression is separate;
package body System_Defined_Expression is separate;
end Generic_Expression;