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-- CXAA010.A

--

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--                                    DISCLAIMER

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--     ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR

--     DISCLOSED ARE AS IS.  THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED

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--     OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A

--     PARTICULAR PURPOSE OF SAID MATERIAL.

--*

--

-- OBJECTIVE:

--      Check that the operations defined in package Ada.Text_IO.Decimal_IO

--      are available, and that they function correctly when used for the

--      input/output of Decimal types.

--

-- TEST DESCRIPTION:

--      This test demonstrates the Put and Get procedures found in the

--      generic package Ada.Text_IO.Decimal_IO.  Both Put and Get are

--      overloaded to allow placement or extraction of decimal values

--      to/from a text file or a string.  This test demonstrates both forms

--      of each subprogram.

--      The test defines an array of records containing decimal value

--      and string component fields.  All component values are placed in a

--      Text_IO file, with the decimal values being placed there using the

--      version of Put defined for files, and using user-specified formatting

--      parameters.  The data is later extracted from the file, with the

--      decimal values being removed using the version of Get defined for

--      files.  Decimal values are then written to strings, using the

--      appropriate Put procedure.  Finally, extraction of the decimal data

--      from the strings completes the evaluation of the Decimal_IO package

--      subprograms.

--      The reconstructed data is verified at the end of the test against the

--      data originally written to the file.

--

-- APPLICABILITY CRITERIA:

--      Applicable to all implementations capable of supporting external

--      Text_IO files and Decimal Fixed Point Types

--

--      All implementations must attempt to compile this test.

--

--      For implementations validating against Information Systems Annex (F):

--        this test must execute and report PASSED.

--

--      For implementations not validating against Annex F:

--        this test may report compile time errors at one or more points

--        indicated by "-- ANX-F RQMT", in which case it may be graded as inapplicable.

--        Otherwise, the test must execute and report PASSED.

--

--

-- CHANGE HISTORY:

--      06 Dec 94   SAIC    ACVC 2.0

--      20 Feb 95   SAIC    Modified test to allow for Use_Error/Name_Error

--                          generation by an implementation not supporting

--                          Text_IO operations.

--      14 Nov 95   SAIC    Corrected string indexing for ACVC 2.0.1.

--      27 Feb 97   PWB.CTA Allowed for non-support of some IO operations

--      16 FEB 98   EDS     Modified documentation.

--!

with Ada.Text_IO;

with Report;

procedure CXAA010 is

   use Ada.Text_IO;

   Tax_Roll      : Ada.Text_IO.File_Type;

   Tax_Roll_Name : constant String :=

                           Report.Legal_File_Name ( Nam => "CXAA010" );

   Incomplete : exception;

begin

   Report.Test ("CXAA010", "Check that the operations defined in package " &

                           "Ada.Text_IO.Decimal_IO are available, and "    &

                           "that they function correctly when used for "   &

                           "the input/output of Decimal types");

   Test_for_Decimal_IO_Support:

   begin

      -- An implementation that does not support Text_IO creation or naming

      -- of external files in a particular environment will raise Use_Error

      -- or Name_Error on a call to Text_IO Create. This block statement

      -- encloses a call to Create, which should produce an exception in a

      -- non-supportive environment.  Either of these exceptions will be

      -- handled to produce a Not_Applicable result.

      Ada.Text_IO.Create (Tax_Roll, Ada.Text_IO.Out_File, Tax_Roll_Name);

   exception

       when Ada.Text_IO.Use_Error | Ada.Text_IO.Name_Error =>

          Report.Not_Applicable

             ( "Files not supported - Create as Out_File for Text_IO" );

          raise Incomplete;

   end Test_for_Decimal_IO_Support;

   Taxation:

   declare

      ID_Length           : constant :=  5;

      Price_String_Length : constant :=  5;

      Value_String_Length : constant :=  6;

      Total_String_Length : constant := 20;

      Spacer              : constant String := "  ";  -- Two blanks.

      type Price_Type     is delta 0.1  digits 4;              -- ANX-F RQMT

      type Value_Type     is delta 0.01 digits 5;              -- ANX-F RQMT

      type Property_Type  is

         record

            Parcel_ID      : String (1..ID_Length);

            Purchase_Price : Price_Type;

            Assessed_Value : Value_Type;

         end record;

      type    City_Block_Type     is array (1..4) of Property_Type;

      subtype Tax_Bill_Type       is string (1..Total_String_Length);

      type    Tax_Bill_Array_Type is array (1..4) of Tax_Bill_Type;

      Neighborhood : City_Block_Type :=

        (("X9254", 123.0, 135.00), ("X3569", 345.0, 140.50),

         ("X3434", 234.0, 179.50), ("X8838", 456.0, 158.00));

      Neighborhood_Taxes : Tax_Bill_Array_Type;

      package Price_IO is new Ada.Text_IO.Decimal_IO (Price_Type);

      package Value_IO is new Ada.Text_IO.Decimal_IO (Value_Type);

   begin  -- Taxation

      Assessors_Office:

      begin

         for Parcel in City_Block_Type'Range loop

            -- Note: All data in the file will be separated with a

            --       two-character blank spacer.

            Ada.Text_IO.Put(Tax_Roll, Neighborhood(Parcel).Parcel_ID);

            Ada.Text_IO.Put(Tax_Roll, Spacer);

            -- Use Decimal_IO.Put with non-default format parameters to

            -- place decimal data into file.

            Price_IO.Put   (Tax_Roll, Neighborhood(Parcel).Purchase_Price,

                            Fore => 3, Aft =>1, Exp => 0);

            Ada.Text_IO.Put(Tax_Roll, Spacer);

            Value_IO.Put   (Tax_Roll, Neighborhood(Parcel).Assessed_Value,

                            Fore => 3, Aft =>2, Exp => 0);

            Ada.Text_IO.New_Line(Tax_Roll);

         end loop;

         Ada.Text_IO.Close (Tax_Roll);

      exception

         when others =>

            Report.Failed ("Exception raised in Assessor's Office");

      end Assessors_Office;

      Twice_A_Year:

      declare

         procedure Collect_Tax(Index     : in     Integer;

                               Tax_Array : in out Tax_Bill_Array_Type) is

            ID            : String (1..ID_Length);

            Price         : Price_Type := 0.0;

            Value         : Value_Type := 0.00;

            Price_String  : String (1..Price_String_Length);

            Value_String  : String (1..Value_String_Length);

         begin

            -- Extract information from the Text_IO file; one string, two

            -- decimal values.

            -- Note that the Spacers that were put in the file above are

            -- not individually read here, due to the fact that each call

            -- to Decimal_IO.Get below uses a zero in the Width field,

            -- which allows each Get procedure to skip these leading blanks

            -- prior to extracting the numeric value.

            Ada.Text_IO.Get (Tax_Roll, ID);

            -- A zero value of Width is provided, so the following

            -- two calls to Decimal_IO.Get will skip the leading blanks,

            -- (from the Spacer variable above), then read the numeric

            -- literals.

            Price_IO.Get    (Tax_Roll, Price, 0);

            Value_IO.Get    (Tax_Roll, Value, 0);

            Ada.Text_IO.Skip_Line (Tax_Roll);

            -- Convert the values read from the file into string format,

            -- using user-specified format parameters.

            -- Format of the Price_String should be "nnn.n"

            -- Format of the Value_String should be "nnn.nn"

            Price_IO.Put (To   => Price_String,

                          Item => Price,

                          Aft  => 1);

            Value_IO.Put (Value_String, Value, 2);

            -- Construct a string of length 20 that contains the Parcel_ID,

            -- the Purchase_Price, and the Assessed_Value, separated by

            -- two-character blank data spacers.  Store this string

            -- into the string array out parameter.

            -- Format of each Tax_Array element should be

            -- "Xnnnn  nnn.n  nnn.nn" (with an 'n' signifying a digit).

            Tax_Array(Index) := ID           & Spacer &

                                Price_String & Spacer &

                                Value_String;

         exception

            when Data_Error =>

               Report.Failed("Data Error raised during the extraction " &

                             "of decimal data from the file");

            when others     =>

              Report.Failed("Exception in Collect_Tax procedure");

         end Collect_Tax;

      begin  -- Twice_A_Year

         Ada.Text_IO.Open (Tax_Roll, Ada.Text_IO.In_File, Tax_Roll_Name);

         -- Determine property tax bills for the entire neighborhood from

         -- the information that is stored in the file. Store information

         -- in the Neighborhood_Taxes string array.

         for Parcel in City_Block_Type'Range loop

            Collect_Tax (Parcel, Neighborhood_Taxes);

         end loop;

      exception

         when others =>

           Report.Failed ("Exception in Twice_A_Year Block");

      end Twice_A_Year;

      -- Use Decimal_IO Get procedure to extract information from a string.

      -- Verify data against original values.

      Validation_Block:

      declare

         TC_ID     : String (1..ID_Length);    -- 1..5

         TC_Price  : Price_Type;

         TC_Value  : Value_Type;

         Length    : Positive;

         Front,

         Rear      : Integer := 0;

      begin

         for Parcel in City_Block_Type'Range loop

            -- Extract values from the strings of the string array.

            -- Each element of the string array is 20 characters long; the

            -- first five characters are the Parcel_ID, two blank characters

            -- separate data, the next five characters contain the Price

            -- decimal value, two blank characters separate data, the last

            -- six characters contain the Value decimal value.

            -- Extract each of these components in turn.

            Front := 1;                                        --  1

            Rear  := ID_Length;                                --  5

            TC_ID := Neighborhood_Taxes(Parcel)(Front..Rear);

            -- Extract the decimal value from the next slice of the string.

            Front := Rear + 3;                                 --  8

            Rear  := Front + Price_String_Length - 1;          -- 12

            Price_IO.Get (Neighborhood_Taxes(Parcel)(Front..Rear),

                          Item => TC_Price,

                          Last => Length);

            -- Extract next decimal value from slice of string, based on

            -- length of preceding strings read from string array element.

            Front := Rear + 3;                                 -- 15

            Rear  := Total_String_Length;                      -- 20

            Value_IO.Get (Neighborhood_Taxes(Parcel)(Front..Rear),

                          Item => TC_Value,

                          Last => Length);

            if TC_ID    /= Neighborhood(Parcel).Parcel_ID       or

               TC_Price /= Neighborhood(Parcel).Purchase_Price  or

               TC_Value /= Neighborhood(Parcel).Assessed_Value

            then

               Report.Failed ("Incorrect data validation");

            end if;

         end loop;

      exception

         when others => Report.Failed ("Exception in Validation Block");

      end Validation_Block;

      -- Check that the Text_IO file is open, then delete.

      if not Ada.Text_IO.Is_Open (Tax_Roll) then

         Report.Failed ("File not left open after processing");

         Ada.Text_IO.Open (Tax_Roll, Ada.Text_IO.Out_File, Tax_Roll_Name);

      end if;

      Ada.Text_IO.Delete (Tax_Roll);

   exception

      when others =>

         Report.Failed ("Exception in Taxation block");

         -- Check that the Text_IO file is open, then delete.

         if not Ada.Text_IO.Is_Open (Tax_Roll) then

            Ada.Text_IO.Open (Tax_Roll,

                              Ada.Text_IO.Out_File,

                              Tax_Roll_Name);

         end if;

         Ada.Text_IO.Delete (Tax_Roll);

   end Taxation;

   Report.Result;

exception

   when Incomplete =>

      Report.Result;

   when others     =>

      Report.Failed ( "Unexpected exception" );

      Report.Result;

end CXAA010;