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562 | -- Created On : Fri Apr 26 08:13:44 1996
with Ada.Text_IO;
with Ada.Strings.Fixed;
with Ada.Strings.Maps;
with Ada.Characters.Handling;
with Ada.Unchecked_Deallocation;
with Ada.IO_Exceptions;
package body Config is
procedure Free is new Ada.Unchecked_Deallocation (String, Str_Ptr);
procedure Init (Cfg : out Configuration;
Config_File_Name : String;
Case_Sensitive : Boolean := True;
On_Type_Mismatch : Type_Mismatch_Action := Raise_Data_Error;
Variable_Terminator : Character := '='
)
is
begin
Free (Cfg.Config_File);
Cfg.Config_File := new String'(Config_File_Name);
Cfg.Case_Sensitive := Case_Sensitive;
Cfg.On_Type_Mismatch := On_Type_Mismatch;
Cfg.Variable_Terminator := Variable_Terminator;
end Init;
function Init (Config_File_Name : String;
Case_Sensitive : Boolean := True;
On_Type_Mismatch : Type_Mismatch_Action := Raise_Data_Error;
Variable_Terminator : Character := '='
)
return Configuration
is
Cfg : Configuration;
begin
Init (Cfg, Config_File_Name, Case_Sensitive, On_Type_Mismatch, Variable_Terminator);
return Cfg;
end Init;
function Is_Number_Start (c : Character) return Boolean is
begin
case c is
when '0' .. '9' | '+' | '-' =>
return True;
when others =>
return False;
end case;
end Is_Number_Start;
-- Internal
--
procedure Get_Value (Cfg : in Configuration;
Section : in String;
Mark : in String;
Line : out String;
Value_Start : out Natural;
Value_End : out Natural;
Found_Line : out Natural
)
is
use Ada.Text_IO;
use Ada.Strings.Fixed;
use Ada.Strings.Maps;
use Ada.Strings;
use Ada.Characters.Handling;
File : File_Type;
Line_End : Natural := 0;
Line_Count : Natural := 0;
Sect_End : Natural;
Comment_Ind : Natural;
Equal_Ind : Natural;
Found_Section_End : Natural;
Found_Mark_Start : Natural;
Found_Mark_End : Natural := 0;
In_Found_Section : Boolean := False;
Value_Start_Try : Natural;
begin -- Get_Value
Value_Start := Line'First;
Value_End := Line'First - 1;
Found_Line := 0;
Open (File, In_File, Cfg.Config_File.all);
Read_File :
while not End_Of_File (File) loop
Get_Line (File, Line, Line_End); -- error if line end > line'Last
Line_Count := Line_Count + 1;
if Line_End > 1 then
case Line (Line'First) is
when '[' =>
Sect_End := Index (Source => Line (Line'First .. Line_End),
Pattern => "]");
-- error if ext_end = 0
Found_Section_End := Sect_End - 1;
-- pragma Debug(Put_Line("Config: found_section => " &
-- Line(2..Found_Section_End)));
if Cfg.Case_Sensitive then
In_Found_Section := Section = Line (Line'First + 1 .. Found_Section_End);
else
In_Found_Section :=
To_Lower (Section) = To_Lower (Line (Line'First + 1 .. Found_Section_End));
end if;
when ';' | '#' =>
null; -- This is a full-line comment
when others =>
if Section = "*" then
In_Found_Section := True;
end if;
if In_Found_Section then
Comment_Ind := Index (Source => Line (Line'First .. Line_End),
Set => To_Set ("#;"));
if Comment_Ind >= Line'First then
Line_End := Comment_Ind - 1;
end if;
Equal_Ind := Index (Source => Line (Line'First .. Line_End),
Pattern => (1 => Cfg.Variable_Terminator));
if Equal_Ind >= Line'First then
Found_Mark_Start :=
Index_Non_Blank (Line (Line'First .. Equal_Ind - 1), Forward);
Found_Mark_End :=
Index_Non_Blank (Line (Line'First .. Equal_Ind - 1), Backward);
else
Found_Mark_Start :=
Index_Non_Blank (Line (Line'First .. Line_End), Forward);
Found_Mark_End :=
Index_Non_Blank (Line (Line'First .. Line_End), Backward);
end if;
-- Put_Line("Config: found_mark => [" &
-- Line(Found_Mark_start..Found_Mark_End) & "] equal ind=" & Equal_Ind'Img &
-- " termi=[" & Cfg.Variable_Terminator & ']');
if Found_Mark_Start > 0 and then
Found_Mark_End > 0
then
if (Cfg.Case_Sensitive and then
(Line (Found_Mark_Start .. Found_Mark_End) = Mark))
or else (not Cfg.Case_Sensitive and then
(To_Lower (Line (Found_Mark_Start ..
Found_Mark_End))
= To_Lower (Mark)))
then
Found_Line := Line_Count;
if Equal_Ind >= Line'First then
Value_Start_Try :=
Index_Non_Blank (Line (Equal_Ind + 1 .. Line_End),
Forward);
if Value_Start_Try >= Line'First then
Value_End :=
Index_Non_Blank (Line (Value_Start_Try .. Line_End),
Backward);
Value_Start := Value_Start_Try;
end if;
end if;
exit Read_File;
end if;
end if;
end if;
end case;
end if;
end loop Read_File;
Close (File);
end Get_Value;
Max_Line_Length : constant := 1000;
function Value_Of (Cfg : Configuration;
Section : String;
Mark : String;
Default : String := "")
return String
is
Line : String (1 .. Max_Line_Length);
Value_Start : Natural := Line'First;
Value_End : Natural := Line'First - 1;
Found_Line : Natural := 0;
begin
Get_Value (Cfg, Section, Mark, Line, Value_Start, Value_End, Found_Line);
if Line (Value_Start .. Value_End) = "" then
return Default;
else
return Line (Value_Start .. Value_End);
end if;
end Value_Of;
procedure Type_Error (Cfg : Configuration; Val, Desc : String) is
use Ada.Text_IO;
Err_Msg : constant String := "'" & Val & "' is not " & Desc;
begin
case Cfg.On_Type_Mismatch is
when Raise_Data_Error =>
raise Ada.Text_IO.Data_Error with "Config (.ini files): " & Err_Msg;
when Print_Warning =>
Put_Line (Standard_Error, "Config: warning: " & Err_Msg);
when Be_Quiet =>
null;
end case;
end Type_Error;
function Value_Of (Cfg : Configuration;
Section : String;
Mark : String;
Default : Integer := 0)
return Integer
is
Line : String (1 .. Max_Line_Length);
Value_Start : Natural := Line'First;
Value_End : Natural := Line'First - 1;
Found_Line : Natural := 0;
begin
Get_Value (Cfg, Section, Mark, Line, Value_Start, Value_End, Found_Line);
if Found_Line = 0 then
return Default;
end if;
declare
Value_As_String : constant String := Line (Value_Start .. Value_End);
begin
if Value_As_String'Length > 2 and then
Line (Value_Start .. Value_Start + 1) = "0x"
then
return Integer'Value ("16#" &
Line (Value_Start + 2 .. Value_End) &
"#");
elsif Value_As_String'Length > 0 and then
Is_Number_Start (Line (Value_Start))
then
return Integer'Value (Value_As_String);
else
Type_Error (Cfg, Value_As_String, "an integer number in line" & Integer'Image (Found_Line));
return Default;
end if;
end;
exception
when Constraint_Error => -- raised by 'Value on faulty argument
Type_Error (Cfg, Line (Value_Start .. Value_End), "an integer number in line" & Integer'Image (Found_Line));
return Default;
end Value_Of;
function Value_Of (Cfg : Configuration;
Section : String;
Mark : String;
Default : Long_Float := 0.0)
return Long_Float
is
Line : String (1 .. Max_Line_Length);
Value_Start : Natural := Line'First;
Value_End : Natural := Line'First - 1;
Found_Line : Natural := 0;
begin
Get_Value (Cfg, Section, Mark, Line, Value_Start, Value_End, Found_Line);
if Found_Line = 0 then
return Default;
end if;
declare
Value_As_String : constant String := Line (Value_Start .. Value_End);
Val : Long_Float;
package LFIO is new Ada.Text_IO.Float_IO (Long_Float);
Last : Positive;
begin
if Value_As_String'Length > 0 and then
Is_Number_Start (Value_As_String (Value_As_String'First))
then
-- Val := Long_Float'Value(Value_As_String);
-- ^ an old compiler doesn't like some floats repr. through 'Value
LFIO.Get (Value_As_String, Val, Last);
return Val;
else
Type_Error (Cfg, Value_As_String, "a floating-point number in line" & Integer'Image (Found_Line));
return Default;
end if;
exception
-- raised by 'Value or Get (respectively) on faulty argument:
when Constraint_Error | Ada.IO_Exceptions.Data_Error =>
Type_Error (Cfg, Value_As_String, "a floating-point number in line" & Integer'Image (Found_Line));
return Default;
end;
end Value_Of;
function Value_Of (Cfg : Configuration;
Section : String;
Mark : String;
Default : Boolean := False)
return Boolean
is
begin
return Boolean'Value (Value_Of (Cfg, Section, Mark, Boolean'Image (Default)));
end Value_Of;
-- Return True if one of the following conditions is met:
-- o the Mark is within the Section, but no equal sign is in that line,
-- o the Mark is set to either 1, True or Yes.
-- All other cases return False.
function Is_Set (Cfg : Configuration;
Section : String;
Mark : String)
return Boolean is
use Ada.Characters.Handling;
Line : String (1 .. Max_Line_Length);
Value_Start : Natural;
Value_End : Natural;
Found_Line : Natural;
begin
Get_Value (Cfg, Section, Mark, Line, Value_Start, Value_End, Found_Line);
declare
Value : constant String := To_Lower (Line (Value_Start .. Value_End));
begin
return Found_Line > 0 and then
(Value = "" or else Value = "1" or else
Value = "true" or else Value = "yes");
end;
end Is_Set;
function File_Name (Cfg : Configuration) return String is
begin
return Cfg.Config_File.all;
end File_Name;
-- List of strings, for memorizing a config file.
type Ini_Line;
type Ini_Line_Ptr is access Ini_Line;
type Ini_Line is record
next : Ini_Line_Ptr := null;
line : Str_Ptr;
end record;
procedure Free is new Ada.Unchecked_Deallocation (Ini_Line, Ini_Line_Ptr);
procedure Write_and_Free (Cfg : in Configuration;
new_contents : in out Ini_Line_Ptr)
is
curr, to_free : Ini_Line_Ptr := null;
use Ada.Text_IO;
File : File_Type;
begin
Create (File, Out_File, Cfg.Config_File.all);
curr := new_contents;
while curr /= null loop
Put_Line (File, curr.line.all);
to_free := curr;
curr := curr.next;
Free (to_free.line);
Free (to_free);
end loop;
Close (File);
new_contents := null;
end Write_and_Free;
procedure Replace_Value (Cfg : Configuration;
Section : String;
Mark : String;
New_Value : String)
is
Line : String (1 .. Max_Line_Length);
Value_Start : Natural;
Value_End : Natural;
Found_Line : Natural;
Equal_Ind : Natural;
Line_End : Natural := 0;
Line_Count : Natural := 0;
use Ada.Text_IO;
File : File_Type;
use Ada.Strings.Fixed;
--
root, curr, new_ini_line : Ini_Line_Ptr := null;
begin
Get_Value (Cfg, Section, Mark, Line, Value_Start, Value_End, Found_Line);
if Found_Line = 0 then
raise Location_Not_Found with "(Config / .ini file)";
end if;
Open (File, In_File, Cfg.Config_File.all);
Read_File :
while not End_Of_File (File) loop
Get_Line (File, Line, Line_End);
Line_Count := Line_Count + 1;
--
new_ini_line := new Ini_Line;
if root = null then
root := new_ini_line;
else
curr.next := new_ini_line;
end if;
curr := new_ini_line;
--
if Line_Count = Found_Line then -- Change this line
Equal_Ind := Index (Source => Line (1 .. Line_End),
Pattern => (1 => Cfg.Variable_Terminator));
if Equal_Ind < 1 then -- No '=' or so yet, will change...
curr.line := new String'(Line (1 .. Line_End) & Cfg.Variable_Terminator & New_Value);
else
curr.line := new String'(Line (1 .. Equal_Ind) & New_Value);
end if;
else -- any other line: just copy
curr.line := new String'(Line (1 .. Line_End));
end if;
end loop Read_File;
Close (File);
-- Now, write the new file
Write_and_Free (Cfg, root);
end Replace_Value;
procedure Replace_Section (Cfg : Configuration;
Section : String;
New_Contents : String)
is
Line : String (1 .. Max_Line_Length);
Line_End : Natural := 0;
Line_Count : Natural := 0;
use Ada.Text_IO;
File : File_Type;
--
root, curr, new_ini_line : Ini_Line_Ptr := null;
--
procedure List_progress is
begin
new_ini_line := new Ini_Line;
if root = null then
root := new_ini_line;
else
curr.next := new_ini_line;
end if;
curr := new_ini_line;
end List_progress;
--
Matched_section, Found_section : Boolean := False;
I : Natural := New_Contents'First;
use Ada.Characters.Handling;
begin
Open (File, In_File, Cfg.Config_File.all);
Read_File :
while not End_Of_File (File) loop
Get_Line (File, Line, Line_End);
Line_Count := Line_Count + 1;
if Line_End > 0 and then
Line (1) = '['
then -- It is a section header.
Matched_section :=
Line_End >= 2 + Section'Length and then
(
(Cfg.Case_Sensitive and then
Line (2 .. 2 + Section'Length) = Section & ']'
)
or else
((not Cfg.Case_Sensitive) and then
To_Lower (Line (2 .. 2 + Section'Length)) = To_Lower (Section) & ']'
)
);
List_progress;
curr.line := new String'(Line (1 .. Line_End));
if Matched_section then
Found_section := True;
for J in New_Contents'Range loop -- copy new contents
if New_Contents (J) = LF then
List_progress;
curr.line := new String'(New_Contents (I .. J - 1));
I := J + 1;
end if;
if J = New_Contents'Last then
List_progress;
curr.line := new String'(New_Contents (I .. J));
end if;
-- NB: we can have have a LF at the end, hence both "if"-s
end loop;
end if;
elsif Matched_section then
null; -- don't copy old contents
else
List_progress;
curr.line := new String'(Line (1 .. Line_End));
end if;
end loop Read_File;
Close (File);
-- Now, write the new file
Write_and_Free (Cfg, root);
if not Found_section then
raise Section_Not_Found with "(Config / .ini file)";
end if;
end Replace_Section;
-- Disable the Mark using a semicolon prefix
--
procedure Disable (Cfg : Configuration;
Section : String;
Mark : String)
is
Line : String (1 .. Max_Line_Length);
Value_Start : Natural;
Value_End : Natural;
Found_Line : Natural;
Line_End : Natural := 0;
Line_Count : Natural := 0;
use Ada.Text_IO;
File : File_Type;
--
root, curr, new_ini_line : Ini_Line_Ptr := null;
begin
Get_Value (Cfg, Section, Mark, Line, Value_Start, Value_End, Found_Line);
if Found_Line = 0 then
raise Location_Not_Found with "(Config / .ini file)";
end if;
Open (File, In_File, Cfg.Config_File.all);
Read_File :
while not End_Of_File (File) loop
Get_Line (File, Line, Line_End);
Line_Count := Line_Count + 1;
--
new_ini_line := new Ini_Line;
if root = null then
root := new_ini_line;
else
curr.next := new_ini_line;
end if;
curr := new_ini_line;
--
if Line_Count = Found_Line then -- Comment out this line
curr.line := new String'("; " & Line (1 .. Line_End));
else -- any other line: just copy
curr.line := new String'(Line (1 .. Line_End));
end if;
end loop Read_File;
Close (File);
-- Now, write the new file
Write_and_Free (Cfg, root);
end Disable;
function Read_Sections (Cfg : Configuration) return Section_List
is
use Ada.Text_IO;
use Ada.Strings.Fixed;
File : File_Type;
Section_Names : Section_List;
begin
Open (File, In_File, Cfg.Config_File.all);
Read_File :
while not End_Of_File (File) loop
declare
Cfg_Line : constant String := Get_Line (File);
Sect_End : Natural;
begin
if Cfg_Line'Length > 1 and then Cfg_Line (Cfg_Line'First) = '[' then
Sect_End := Index (Cfg_Line, "]") - 1;
String_Vector.Append (Section_Names, Cfg_Line (Cfg_Line'First + 1 .. Sect_End));
end if;
end;
end loop Read_File;
Close (File);
return Section_Names;
end Read_Sections;
end Config;
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