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Comment:s_expressions-printers: new packge defining an interface for S-expression input
Timelines: family | ancestors | descendants | both | trunk
Files: files | file ages | folders
SHA1: 7e2c24061769949dbf81aa2ba8debd48743334b9
User & Date: nat on 2014-01-07 21:00:15
Other Links: manifest | tags
Context
2014-01-08
20:14
s_expressions-test_tools: new type memory stream to test input and output interfaces to streams check-in: e57fb70751 user: nat tags: trunk
2014-01-07
21:00
s_expressions-printers: new packge defining an interface for S-expression input check-in: 7e2c240617 user: nat tags: trunk
2014-01-06
19:29
s_expressions-atom_buffers-tests: fully-covering test suite for atom buffers check-in: 0f499b1b87 user: nat tags: trunk
Changes
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Added src/natools-s_expressions-printers.adb version [43fb78d2eb]. 
















































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------------------------------------------------------------------------------
-- Copyright (c) 2013-2014, Natacha Porté                                   --
--                                                                          --
-- Permission to use, copy, modify, and distribute this software for any    --
-- purpose with or without fee is hereby granted, provided that the above   --
-- copyright notice and this permission notice appear in all copies.        --
--                                                                          --
-- THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES --
-- WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF         --
-- MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR  --
-- ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES   --
-- WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN    --
-- ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF  --
-- OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.           --
------------------------------------------------------------------------------

with Natools.S_Expressions.Encodings;

package body Natools.S_Expressions.Printers is

   overriding procedure Open_List (Output : in out Canonical) is
   begin
      Output.Stream.Write ((0 => Encodings.List_Begin));
   end Open_List;


   overriding procedure Append_Atom (Output : in out Canonical;
                                     Data : in Atom)
   is
      Length_Image : constant String := Count'Image (Data'Length);
      Length_Data  : Atom (0 .. Length_Image'Length);
   begin
      Length_Data (0 .. Length_Image'Length - 1) := To_Atom (Length_Image);
      Length_Data (Length_Data'Last) := Encodings.Verbatim_Begin;

      Output.Stream.Write (Length_Data (1 .. Length_Data'Last));
      Output.Stream.Write (Data);
   end Append_Atom;


   overriding procedure Close_List (Output : in out Canonical) is
   begin
      Output.Stream.Write ((0 => Encodings.List_End));
   end Close_List;

end Natools.S_Expressions.Printers;








Added src/natools-s_expressions-printers.ads version [fb1c125d35].






















































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------------------------------------------------------------------------------
-- Copyright (c) 2013-2014, Natacha Porté                                   --
--                                                                          --
-- Permission to use, copy, modify, and distribute this software for any    --
-- purpose with or without fee is hereby granted, provided that the above   --
-- copyright notice and this permission notice appear in all copies.        --
--                                                                          --
-- THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES --
-- WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF         --
-- MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR  --
-- ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES   --
-- WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN    --
-- ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF  --
-- OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.           --
------------------------------------------------------------------------------

------------------------------------------------------------------------------
-- Natools.S_Expressions.Printers mainly provides an interface for objects  --
-- that are "printer-like", which means the client somehow transmits        --
-- sequentially whatever information is needed to output a S-expression.    --
-- This contrasts with Descriptor interface, in that the latter provides an --
-- interface for S-expression from the object to its client, while Printer  --
-- interface is for S-epression transmitted from the client to its the      --
-- object.                                                                  --
--                                                                          --
-- The package also provide concrete type Canonical, which outputs the      --
-- S-expression provided through the interface into the given output        --
-- stream, using canonical encoding.                                        --
------------------------------------------------------------------------------

with Ada.Streams;

package Natools.S_Expressions.Printers is
   pragma Pure (Natools.S_Expressions.Printers);

   type Printer is limited interface;

   procedure Open_List (Output : in out Printer) is abstract;
   procedure Append_Atom (Output : in out Printer; Data : in Atom) is abstract;
   procedure Close_List (Output : in out Printer) is abstract;

   type Canonical (Stream : access Ada.Streams.Root_Stream_Type'Class) is
     new Printer with null record;

   overriding procedure Open_List (Output : in out Canonical);
   overriding procedure Append_Atom (Output : in out Canonical;
                                     Data : in Atom);
   overriding procedure Close_List (Output : in out Canonical);

end Natools.S_Expressions.Printers;













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