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⟦532cedd89⟧ Ada Source

    Length: 5120 (0x1400)
    Types: Ada Source
    Notes: 03_class, FILE, R1k_Segment, e3_tag, generic, package Expression_Utilities, seg_004627

Derivation

└─⟦8527c1e9b⟧ Bits:30000544 8mm tape, Rational 1000, Arrival backup of disks in PAM's R1000
    └─⟦5a81ac88f⟧ »Space Info Vol 1« 
        └─⟦this⟧ 

--| @SUMMARY This package provides utilities for analyzing expressions.
--| The Value functions will compute the static value of an expression by
--| performing any operations used in the expression (ie the expression
--| 4 + 5 will return 9, 4 + A will return 2 if A is a constant with
--| value -2.
--| @INDICES (Ada_Analysis, Value_Computation)
with Ada_Program;
package Expression_Utilities is

    function Is_Expression (Elem : Ada_Program.Element) return Boolean;


    --| @DESCRIPTION  Computes the static value of an integer expression
    --| the formal Non_Static_Value is used to query for values which
    --| and not static in the code.  If Has_Value is false the exception
    --| Not_Static is raised.
    --| @RAISES (Not_Static)
    generic
        with procedure Non_Static_Value
                          (For_Name_Expression :     Ada_Program.Expression;
                           Value               : out Long_Integer;
                           Has_Value           : out Boolean);

    function Integer_Value (Integer_Expression : Ada_Program.Expression)
                           return Long_Integer;

    --| @DESCRIPTION  Computes the static value of an float expression
    --| the formal Non_Static_Value is used to query for values which
    --| and not static in the code.  If Has_Value is false the exception
    --| Not_Static is raised.
    --| @RAISES (Not_Static)
    generic
        with procedure Non_Static_Value
                          (For_Name_Expression :     Ada_Program.Expression;
                           Value               : out Float;
                           Has_Value           : out Boolean);

    function Float_Value
                (Float_Expression : Ada_Program.Expression) return Float;

    --| @DESCRIPTION  Computes the static value of an string expression
    --| the formal Non_Static_Value is used to query for values which
    --| and not static in the code.  If Has_Value is false the exception
    --| Not_Static is raised.
    --| @RAISES (Not_Static)
    generic
        with procedure Non_Static_Value
                          (For_Name_Expression :     Ada_Program.Expression;
                           Value               : out String;
                           Last                : out Positive;
                           Has_Value           : out Boolean);

    function String_Value
                (String_Expression : Ada_Program.Expression) return String;

    --| @DESCRIPTION Raise if the value of the expression cannot be statically
    --| computed.
    Not_Static : exception;

    type Operator_Kind is (Concatenate,  
                           Plus,  
                           Minus,  
                           Times,  
                           Divide,  
                           Unary_Minus,  
                           Unary_Plus,  
                           Other_Operator,  
                           Not_An_Operator_Expression);

    function Expression_Operator
                (Expr : Ada_Program.Expression) return Operator_Kind;

    --| @DESCRIPTION Returns the left operand of a binary expression
    --| or the only operand of a unary expression.
    function Left_Operand (Expr : Ada_Program.Expression)
                          return Ada_Program.Expression;

    --| @DESCRIPTION Returns the right operand of a binary expression.
    function Right_Operand (Expr : Ada_Program.Expression)
                           return Ada_Program.Expression;
end Expression_Utilities;

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