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-- CXA4006.A

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--

-- OBJECTIVE:

--      Check that the subprograms defined in package Ada.Strings.Bounded are

--      available, and that they produce correct results. Specifically, check

--      the subprograms Length, Slice, "&", To_Bounded_String, Append, Index,

--      To_String, Replace_Slice, Trim, Overwrite, Delete, Insert, and

--      Translate.

--

-- TEST DESCRIPTION:

--      This test demonstrates the uses of a variety of the string functions

--      found in the package Ada.Strings.Bounded, simulating the operations

--      found in a text processing package.

--      With bounded strings, the length of each "line" of text can vary up

--      to the instantiated maximum, allowing one to view a page of text as

--      a series of expandable lines.  This provides flexibility in text

--      formatting of individual lines (strings).

--      Several subprograms are defined, all of which attempt to take advantage

--      of as many different bounded string utilities as possible.  Often,

--      an operation that is being performed in a subprogram using a certain

--      bounded string utility could more efficiently be performed using a

--      a different utility.  However, in the interest of including as broad

--      coverage as possible, a mixture of utilities is invoked in this test.

--      A simulated page of text is provided as a parameter to the test

--      defined subprograms, and the appropriate processing performed.  The

--      processed page of text is then compared to a predefined "finished"

--      page, and test passage/failure is based on the results of this

--      comparison.

--

--

-- CHANGE HISTORY:

--      06 Dec 94   SAIC    ACVC 2.0

--

--!

with Ada.Strings;

with Ada.Strings.Bounded;

with Ada.Strings.Maps;

with Report;

procedure CXA4006 is

begin

   Report.Test ("CXA4006", "Check that the subprograms defined in package "  &

                           "Ada.Strings.Bounded are available, and that "    &

                           "they produce correct results");

   Test_Block:

   declare

      Characters_Per_Line : constant Positive := 40;

      Lines_Per_Page      : constant Natural  :=  4;

      package BS_40 is new

        Ada.Strings.Bounded.Generic_Bounded_Length(Characters_Per_Line);

      use type BS_40.Bounded_String;

      type Page_Type is array (1..Lines_Per_Page) of BS_40.Bounded_String;

      -- Note: Misspellings below are intentional.

      Line1 : BS_40.Bounded_String :=

        BS_40.To_Bounded_String("ada is a progrraming language designed");

      Line2 : BS_40.Bounded_String :=

        BS_40.To_Bounded_String("to support the construction of long-");

      Line3 : BS_40.Bounded_String :=

        BS_40.To_Bounded_String("lived, highly reliabel software ");

      Line4 : BS_40.Bounded_String :=

        BS_40.To_Bounded_String("systems");

      Page  : Page_Type := (1 => Line1, 2 => Line2, 3 => Line3, 4 => Line4);

      Finished_Page : Page_Type :=

        (BS_40.To_Bounded_String("Ada is a programming language designed"),

         BS_40.To_Bounded_String("to support the construction of long-"),

         BS_40.To_Bounded_String("lived, HIGHLY RELIABLE software systems."),

         BS_40.To_Bounded_String(""));

      ---

      procedure Compress (Page : in out Page_Type) is

         Clear_Line : Natural := Lines_Per_Page;

      begin

         -- If two consecutive lines on the page are together less than the

         -- maximum line length, then append those two lines, move up all

         -- lower lines on the page, and blank out the last line.

         for i in 1..Lines_Per_Page - 1 loop

            if BS_40.Length(Page(i)) + BS_40.Length(Page(i+1)) <=

               BS_40.Max_Length

            then

               Page(i) := BS_40."&"(Page(i),

                                    Page(i+1));       -- "&" (bounded, bounded)

               for j in i+1..Lines_Per_Page - 1 loop

                  Page(j) :=

                    BS_40.To_Bounded_String

                      (BS_40.Slice(Page(j+1),

                                   1,

                                   BS_40.Length(Page(j+1))));

                  Clear_Line := j + 1;

               end loop;

               Page(Clear_Line) := BS_40.Null_Bounded_String;

            end if;

         end loop;

      end Compress;

      ---

      procedure Format (Page : in out Page_Type) is

         Sm_Ada   : BS_40.Bounded_String := BS_40.To_Bounded_String("ada");

         Cap_Ada  : constant String      := "Ada";

         Char_Pos : Natural := 0;

         Finished : Boolean := False;

         Line     : Natural := Page_Type'Last;

      begin

         -- Add a period to the end of the last line.

         while Line >= Page_Type'First and not Finished loop

            if Page(Line) /= BS_40.Null_Bounded_String      and

               BS_40.Length(Page(Line)) <= BS_40.Max_Length

            then

               Page(Line) := BS_40.Append(Page(Line), '.');

               Finished := True;

            end if;

            Line := Line - 1;

         end loop;

         -- Replace all occurrences of "ada" with "Ada".

         for Line in Page_Type'First .. Page_Type'Last loop

            Finished := False;

            while not Finished loop

               Char_Pos := BS_40.Index(Source  => Page(Line),

                                       Pattern => BS_40.To_String(Sm_Ada),

                                       Going   => Ada.Strings.Backward);

               -- A zero is returned by function Index if no occurrences of

               -- the pattern string are found.

               Finished := (Char_Pos = 0);

               if not Finished then

                  BS_40.Replace_Slice

                    (Source => Page(Line),

                     Low    => Char_Pos,

                     High   => Char_Pos + BS_40.Length(Sm_Ada) - 1,

                     By     => Cap_Ada);

               end if;

            end loop;   -- while loop

         end loop;      -- for loop

      end Format;

      ---

      procedure Spell_Check (Page : in out Page_Type) is

         type Spelling_Type is (Incorrect, Correct);

         type Word_Array_Type is array (Spelling_Type)

           of BS_40.Bounded_String;

         type Dictionary_Type is array (1..2) of Word_Array_Type;

         -- Note that the "words" in the dictionary will require various

         -- amounts of Trimming prior to their use in the string functions.

         Dictionary : Dictionary_Type :=

                      (1 => (BS_40.To_Bounded_String("  reliabel          "),

                             BS_40.To_Bounded_String("       reliable   ")),

                       2 => (BS_40.To_Bounded_String("  progrraming  "),

                             BS_40.To_Bounded_String(" programming ")));

         Pos      : Natural := Natural'First;

         Finished : Boolean := False;

      begin

         for Line in Page_Type'Range loop

            -- Search for the first incorrectly spelled word in the Dictionary,

            -- if it is found, replace it with the correctly spelled word,

            -- using the Overwrite function.

            while not Finished loop

               Pos :=

                 BS_40.Index(Page(Line),

                             BS_40.To_String(

                               BS_40.Trim(Dictionary(1)(Incorrect),

                                          Ada.Strings.Both)),

                             Ada.Strings.Forward);

               Finished := (Pos = 0);

               if not Finished then

                  Page(Line) :=

                    BS_40.Overwrite(Page(Line),

                                    Pos,

                                    BS_40.To_String

                                      (BS_40.Trim(Dictionary(1)(Correct),

                                                  Ada.Strings.Both)));

               end if;

            end loop;

            Finished := False;

            -- Search for the second incorrectly spelled word in the

            -- Dictionary, if it is found, replace it with the correctly

            -- spelled word, using the Delete procedure and Insert function.

            while not Finished loop

               Pos :=

                 BS_40.Index(Page(Line),

                             BS_40.To_String(

                               BS_40.Trim(Dictionary(2)(Incorrect),

                                          Ada.Strings.Both)),

                             Ada.Strings.Forward);

               Finished := (Pos = 0);

               if not Finished then

                  BS_40.Delete

                    (Page(Line),

                     Pos,

                     Pos + BS_40.To_String

                             (BS_40.Trim(Dictionary(2)(Incorrect),

                                         Ada.Strings.Both))'Length-1);

                  Page(Line) :=

                    BS_40.Insert(Page(Line),

                                 Pos,

                                 BS_40.To_String

                                      (BS_40.Trim(Dictionary(2)(Correct),

                                                  Ada.Strings.Both)));

               end if;

            end loop;

            Finished := False;

         end loop;

      end Spell_Check;

      ---

      procedure Bold (Page : in out Page_Type) is

         Key_Word     : constant String := "highly reliable";

         Bold_Mapping : constant Ada.Strings.Maps.Character_Mapping :=

           Ada.Strings.Maps.To_Mapping(From => " abcdefghijklmnopqrstuvwxyz",

                                       To   => " ABCDEFGHIJKLMNOPQRSTUVWXYZ");

         Pos      : Natural := Natural'First;

         Finished : Boolean := False;

      begin

         -- This procedure is designed to change the case of the phrase

         -- "highly reliable" into upper case (a type of "Bolding").

         -- All instances of the phrase on all lines of the page will be

         -- modified.

         for Line in Page_Type'First .. Page_Type'Last loop

            while not Finished loop

               Pos := BS_40.Index(Page(Line), Key_Word);

               Finished := (Pos = 0);

               if not Finished then

                  BS_40.Overwrite

                         (Page(Line),

                          Pos,

                          BS_40.To_String

                            (BS_40.Translate

                               (BS_40.To_Bounded_String

                                   (BS_40.Slice(Page(Line),

                                                Pos,

                                                Pos + Key_Word'Length - 1)),

                                Bold_Mapping)));

               end if;

            end loop;

            Finished := False;

         end loop;

      end Bold;

   begin

      Compress(Page);

      Format(Page);

      Spell_Check(Page);

      Bold(Page);

      for i in 1..Lines_Per_Page loop

         if BS_40.To_String(Page(i)) /= BS_40.To_String(Finished_Page(i)) or

            BS_40.Length(Page(i))    /= BS_40.Length(Finished_Page(i))

         then

            Report.Failed("Incorrect modification of Page, Line " &

                           Integer'Image(i));

         end if;

      end loop;

   exception

      when others => Report.Failed ("Exception raised in Test_Block");

   end Test_Block;

   Report.Result;

end CXA4006;