Overview
| 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: |
7e2c24061769949dbf81aa2ba8debd48 |
| User & Date: | nat on 2014-01-07 21:00:15 |
| Other Links: | manifest | tags |
Context
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2014-01-08
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| 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 | |
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2014-01-07
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| 21:00 | s_expressions-printers: new packge defining an interface for S-expression input check-in: 7e2c240617 user: nat tags: trunk | |
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2014-01-06
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| 19:29 | s_expressions-atom_buffers-tests: fully-covering test suite for atom buffers check-in: 0f499b1b87 user: nat tags: trunk | |
Changes
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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