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-- --
-- package Copyright (c) Dmitry A. Kazakov --
-- Parsers.Generic_Source.XPM Luebeck --
-- Implementation Summer, 2006 --
-- --
-- Last revision : 19:56 08 Aug 2015 --
-- --
-- This library is free software; you can redistribute it and/or --
-- modify it under the terms of the GNU General Public License as --
-- published by the Free Software Foundation; either version 2 of --
-- the License, or (at your option) any later version. This library --
-- is distributed in the hope that it will be useful, but WITHOUT --
-- ANY WARRANTY; without even the implied warranty of --
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU --
-- General Public License for more details. You should have --
-- received a copy of the GNU General Public License along with --
-- this library; if not, write to the Free Software Foundation, --
-- Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. --
-- --
-- As a special exception, if other files instantiate generics from --
-- this unit, or you link this unit with other files to produce an --
-- executable, this unit does not by itself cause the resulting --
-- executable to be covered by the GNU General Public License. This --
-- exception does not however invalidate any other reasons why the --
-- executable file might be covered by the GNU Public License. --
--____________________________________________________________________--
with Ada.Exceptions; use Ada.Exceptions;
with Ada.IO_Exceptions; use Ada.IO_Exceptions;
with Ada.Characters.Handling; use Ada.Characters.Handling;
with Ada.Characters.Latin_1; use Ada.Characters.Latin_1;
with Strings_Edit.Integers; use Strings_Edit.Integers;
package body Parsers.Generic_Source.XPM is
use Color_Tables;
procedure Skip
( Code : in out Source_Type;
In_String : Boolean
) is
type Chain_Type is (Slash, Catenation);
Chain : Chain_Type;
Error_At : Location_Type;
begin
if not In_String then
declare
Got_It : Boolean;
Error : Boolean;
begin
Skip (Code, Got_It, Error, Error_At);
if Error then
Raise_Exception
( Syntax_Error'Identity,
( "Unclosed comment starts at "
& Image (Error_At & Link (Code))
) );
end if;
return;
end;
end if;
loop
declare
Line : Line_Ptr_Type;
Pointer : Integer;
Last : Integer;
begin
Get_Line (Code, Line, Pointer, Last);
loop
if Pointer > Last then
Set_Pointer (Code, Pointer);
Raise_Exception
( Syntax_Error'Identity,
( "Malformed string literal at "
& Image (Link (Code))
) );
end if;
case Line (Pointer) is
when ' ' | HT | LF | CR | VT | FF =>
Pointer := Pointer + 1;
when '\' =>
Pointer := Pointer + 1;
if Pointer > Last then
Chain := Slash;
exit;
end if;
if ( Line (Pointer) = CR
or else
Line (Pointer) = LF
)
then
Pointer := Pointer + 1;
else
Set_Pointer (Code, Pointer - 1);
return;
end if;
when '"' =>
Chain := Catenation;
Set_Pointer (Code, Pointer + 1);
exit;
when others =>
Set_Pointer (Code, Pointer);
return;
end case;
end loop;
end;
case Chain is
when Catenation =>
Skip (Code, False);
declare
Got_It : Boolean;
begin
Get (Code, """", Got_It);
if not Got_It then
Raise_Exception
( Use_Error'Identity,
( "String literal continuation is expected at "
& Image (Link (Code))
) );
end if;
end;
when Slash =>
begin
Next_Line (Code);
exception
when End_Error =>
Raise_Exception
( Syntax_Error'Identity,
( "Unclosed string literal at "
& Image (Link (Code))
) );
end;
end case;
end loop;
end Skip;
procedure Match
( Code : in out Source_Type;
Text : String;
In_String : Boolean
) is
Got_It : Boolean;
begin
Skip (Code, In_String);
Get (Code, Text, Got_It);
if not Got_It then
Raise_Exception
( Syntax_Error'Identity,
( "'"
& Text
& "' is expected at "
& Image (Link (Code))
) );
end if;
end Match;
procedure Match_End (Code : in out Source_Type) is
begin
Skip (Code, True);
Raise_Exception
( Syntax_Error'Identity,
""" is expected at " & Image (Link (Code))
);
exception
when Use_Error =>
return;
end Match_End;
procedure Get_Decimal
( Code : in out Source_Type;
Number : out Integer;
Name : String;
Got_It : out Boolean;
First : Integer := 1;
Last : Integer := Integer'Last
) is
begin
Skip (Code, True);
declare
Line : Line_Ptr_Type;
Pointer : Integer;
Last_Pointer : Integer;
begin
Get_Line (Code, Line, Pointer, Last_Pointer);
Set_Pointer (Code, Pointer);
Get
( Line (Line'First..Last_Pointer),
Pointer,
Number,
First => First,
Last => Last
);
Set_Pointer (Code, Pointer);
Got_It := True;
exception
when End_Error =>
Got_It := False;
when Data_Error =>
Set_Pointer (Code, Pointer);
Raise_Exception
( Syntax_Error'Identity,
( Name
& " is expected at "
& Image (Link (Code))
) );
when Constraint_Error =>
Set_Pointer (Code, Pointer);
Raise_Exception
( Syntax_Error'Identity,
( Name
& " as a positive number "
& Image (First)
& ".."
& Image (Last)
& " is expected "
& Image (Link (Code))
) );
end;
end Get_Decimal;
procedure Match_Decimal
( Code : in out Source_Type;
Number : out Integer;
Name : String;
First : Integer := 1;
Last : Integer := Integer'Last
) is
Got_It : Boolean;
begin
Get_Decimal (Code, Number, Name, Got_It, First, Last);
if not Got_It then
Raise_Exception
( Syntax_Error'Identity,
Name & " is expected at " & Image (Link (Code))
);
end if;
exception
when Error : Use_Error =>
Raise_Exception
( Syntax_Error'Identity,
( Exception_Message (Error)
& " to contain "
& Name
) );
end Match_Decimal;
function Get_Header (Code : access Source_Type; Name : String)
return Descriptor is
This : Source_Type renames Code.all;
Width : Positive;
Height : Positive;
Pixel_Size : Positive;
Map_Size : Positive;
X_Hotspot : Natural;
Y_Hotspot : Natural;
Extended : Boolean;
Hotspot : Boolean;
begin
Skip (This, False);
Match (This, "[", False);
Match (This, "]", False);
Match (This, "=", False);
Match (This, "{", False);
Match (This, """", False);
Match_Decimal (This, Width, "Width");
Match_Decimal (This, Height, "Height");
Match_Decimal (This, Map_Size, "Colors number");
Match_Decimal (This, Pixel_Size, "Characters per pixel");
begin
Get_Decimal
( This,
X_Hotspot,
"x-hot spot",
Hotspot,
First => 0,
Last => Width - 1
);
if Hotspot then
Match_Decimal
( This,
Y_Hotspot,
"y-hot spot",
First => 0,
Last => Height - 1
);
Get (This, "XPMEXT", Extended);
Match_End (This);
return
( Has_Hotspot => True,
Length => Name'Length,
Name => Name,
Width => Width,
Height => Height,
Pixel_Size => Pixel_Size,
Map_Size => Map_Size,
Extended => Extended,
X_Hotspot => X_Hotspot,
Y_Hotspot => Y_Hotspot
);
else
Get (This, "XPMEXT", Extended);
Match_End (This);
return
( Has_Hotspot => False,
Length => Name'Length,
Name => Name,
Width => Width,
Height => Height,
Pixel_Size => Pixel_Size,
Map_Size => Map_Size,
Extended => Extended
);
end if;
exception
when Use_Error =>
return
( Has_Hotspot => False,
Length => Name'Length,
Name => Name,
Width => Width,
Height => Height,
Pixel_Size => Pixel_Size,
Map_Size => Map_Size,
Extended => False
);
end;
end Get_Header;
function Get (Code : access Source_Type) return Descriptor is
This : Source_Type renames Code.all;
Line : Line_Ptr_Type;
Pointer : Integer;
Last : Integer;
Start : Integer;
begin
Match (This, "static", False);
Match (This, "char", False);
Match (This, "*", False);
Skip (This, False);
Get_Line (This, Line, Pointer, Last);
Start := Pointer;
while Pointer < Last loop
case Line (Pointer) is
when 'A'..'Z' | 'a'..'z' | '0'..'9' | '_' =>
Pointer := Pointer + 1;
when '/' | '\' | ':' =>
Pointer := Pointer + 1;
Start := Pointer;
when others =>
exit;
end case;
end loop;
if Pointer = Start then
Set_Pointer (This, Pointer);
Raise_Exception
( Syntax_Error'Identity,
"Identifier is expected at " & Image (Link (This))
);
end if;
declare
Name : String := Line (Start..Pointer - 1);
begin
Set_Pointer (This, Pointer);
return Get_Header (Code, Name);
end;
end Get;
procedure Get_Color
( Code : in out Source_Type;
Map : in out Table;
Name : String;
Name_At : Location_Type
) is
Mode : Color_Type;
Symbolic : Color_Name;
RGB : RGB_Color;
Got_It : Boolean;
begin
Skip (Code, True);
Color_Types.Get (Code, Mode, Got_it);
if not Got_It then
Raise_Exception
( Syntax_Error'Identity,
"Color type is expected at " & Image (Link (Code))
);
end if;
Skip (Code, True);
Color_Names.Get (Code, Symbolic, Got_It);
if Got_It then
case Symbolic is
when None => RGB := RGB_Color'Last;
when Black => RGB := 16#000000#;
when Blue => RGB := 16#0000FF#;
when Green => RGB := 16#00FF00#;
when Red => RGB := 16#FF0000#;
when White => RGB := 16#FFFFFF#;
end case;
else
declare
Line : Line_Ptr_Type;
Pointer : Integer;
Last : Integer;
begin
Get_Line (Code, Line, Pointer, Last);
if Pointer > Last then
Raise_Exception
( Syntax_Error'Identity,
"Color value is expected at " & Image (Link (Code))
);
end if;
if Line (Pointer) = '#' then
Pointer := Pointer + 1;
declare
Value : Natural;
begin
Get
( Line (Line'First..Last),
Pointer,
Value,
Base => 16,
First => 0,
Last => 16#FFFFFF#
);
RGB := RGB_Color (Value);
exception
when End_Error | Data_Error | Constraint_Error =>
Set_Pointer (Code, Pointer);
Raise_Exception
( Syntax_Error'Identity,
( "RGB value 0..FFFFFF is expected at "
& Image (Link (Code))
) );
end;
Set_Pointer (Code, Pointer);
elsif Line (Pointer) = '%' then
Pointer := Pointer + 1;
Set_Pointer (Code, Pointer);
Raise_Exception
( Syntax_Error'Identity,
( "HSV colors aren't supported, as met at "
& Image (Link (Code))
) );
else
Set_Pointer (Code, Pointer);
Raise_Exception
( Syntax_Error'Identity,
( "Color value is expected at "
& Image (Link (Code))
) );
end if;
end;
end if;
Match_End (Code);
begin
Add (Map, Name, RGB);
exception
when Name_Error =>
Raise_Exception
( Syntax_Error'Identity,
( "Duplicate color name '"
& Name
& "' at "
& Image (Name_At)
) );
end;
end Get_Color;
function Get
( Code : access Source_Type;
Header : Descriptor
) return Table is
This : Source_Type renames Code.all;
Name_At : Location_Type;
Map : Table;
Line : Line_Ptr_Type;
Pointer : Integer;
Last : Integer;
Color_Beg : Integer;
Color_End : Integer;
begin
for Color_Entry in 1..Header.Map_Size loop
Match (This, ",", False);
Match (This, """", False);
Name_At := Link (This);
Get_Line (This, Line, Pointer, Last);
Color_Beg := Pointer;
Color_End := Color_Beg + Header.Pixel_Size - 1;
if Color_End - 1 > Last then
Set_Pointer (This, Last + 1);
Raise_Exception
( Syntax_Error'Identity,
( "Color definition is expected at "
& Image (Link (This))
) );
end if;
declare
Name : String := Line (Color_Beg..Color_End);
begin
Set_Pointer (This, Color_End + 1);
Get_Color (This, Map, Name, Name_At);
end;
end loop;
return Map;
end Get;
function Get
( Code : access Source_Type;
Header : Descriptor;
Map : Table
) return Pixel_Buffer is
This : Source_Type renames Code.all;
Result : Pixel_Buffer (1..Header.Height, 1..Header.Width);
Line : Line_Ptr_Type;
Pointer : Integer;
Last : Integer;
begin
for Row in Result'Range (1) loop
Match (This, ",", False);
Match (This, """", False);
Get_Line (This, Line, Pointer, Last);
for Column in Result'Range (2) loop
begin
Get
( Line (Line'First..Last),
Pointer,
Map,
Result (Row, Column)
);
Set_Pointer (This, Pointer);
exception
when End_Error =>
Set_Pointer
( This,
( Pointer
+ Integer'Min (Header.Pixel_Size, Last)
) );
Raise_Exception
( Syntax_Error'Identity,
( "Undefined color name at "
& Image (Link (This))
) );
end;
end loop;
Match_End (This);
end loop;
if Header.Extended then
declare
Got_It : Boolean := False;
begin
while not Got_It loop
Skip (This, False);
Get (This, """", Got_It);
exit when not Got_It;
Got_It := False;
while not Got_It loop
Get_Line (This, Line, Pointer, Last);
while Pointer < Last loop
if Line (Pointer) = '\' then
Pointer := Pointer + 1;
exit when Pointer > Last;
Pointer := Pointer + 1;
elsif Line (Pointer) = '"' then
Got_It := True;
exit;
end if;
end loop;
end loop;
Skip (This, False);
Get (This, ",", Got_It);
end loop;
end;
end if;
Match (This, "}", False);
Match (This, ";", False);
return Result;
end Get;
end Parsers.Generic_Source.XPM;