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with Ada.Strings.Fixed;
with Ada.Strings.Maps;
package body Natools.Getopt_Long is
package Fixed renames Ada.Strings.Fixed;
package Maps renames Ada.Strings.Maps;
---------------------------
-- Any_Name constructors --
---------------------------
function To_Name (Long_Name : String) return Any_Name is
begin
return Any_Name'(Style => Long,
Size => Long_Name'Length,
Long => Long_Name);
end To_Name;
function To_Name (Short_Name : Character) return Any_Name is
begin
return Any_Name'(Style => Short, Size => 1, Short => Short_Name);
end To_Name;
function Image (Name : Any_Name) return String is
begin
case Name.Style is
when Short => return '-' & Name.Short;
when Long => return "--" & Name.Long;
end case;
-- Alternate implementation:
-- case Name.Style is
-- when Short => return String'(1 => Name.Short);
-- when Long => return '"' & Name.Long & '"';
-- end case;
end Image;
----------------------
-- Default handlers --
----------------------
package body Handlers is
procedure Missing_Argument
(Handler : in out Callback;
Id : Option_Id;
Name : Any_Name)
is
pragma Unreferenced (Handler);
pragma Unreferenced (Id);
begin
raise Option_Error with
"Missing argument to option " & Image (Name);
end Missing_Argument;
procedure Unexpected_Argument
(Handler : in out Callback;
Id : Option_Id;
Name : Any_Name;
Argument : String)
is
pragma Unreferenced (Handler);
pragma Unreferenced (Id);
begin
raise Option_Error with
"Unexpected argument """ & Argument
& """ to option " & Image (Name);
end Unexpected_Argument;
procedure Unknown_Option
(Handler : in out Callback;
Name : Any_Name)
is
pragma Unreferenced (Handler);
begin
raise Option_Error with "Unknown option " & Image (Name);
end Unknown_Option;
end Handlers;
----------------------------
-- Option list management --
----------------------------
procedure Add_Option
(Options : in out Option_Definitions;
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-----------------------------
-- Command-line processing --
-----------------------------
procedure Process
(Options : Option_Definitions;
Top_Level_Argument : Option_Id;
Callback : not null access procedure (Id : Option_Id;
Argument : String);
Missing_Argument : access procedure (Id : Option_Id) := null;
Unexpected_Argument : access procedure (Id : Option_Id;
Arg : String) := null;
Unknown_Long_Option : access procedure (Name : String) := null;
Unknown_Short_Option : access procedure (Name : Character) := null;
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if not Long_Option_Maps.Has_Element (Cursor) then
-- Looking for a unique partial match
Cursor := Options.By_Long_Name.Ceiling (Arg_Name);
if not Long_Option_Maps.Has_Element (Cursor) or else
not Has_Prefix (Cursor, Arg_Name) or else
Has_Prefix (Long_Option_Maps.Next (Cursor), Arg_Name)
then
if Unknown_Long_Option = null then
raise Option_Error with "Unknown long option " & Arg_Name;
else
Unknown_Long_Option (Arg_Name);
return;
end if;
Callback (Opt.Id, "");
Handler.Option (Opt.Id, "");
else
if Unexpected_Argument = null then
raise Option_Error with "Unexpected argument """
Handler.Unexpected_Argument
(Opt.Id,
& Arg (Equal + 1 .. Arg'Last) & """ to "
& Opt.Long_Name;
else
Unexpected_Argument (Opt.Id,
Arg (Equal + 1 .. Arg'Last));
end if;
Callback (Opt.Id, "");
Handler.Option (Opt.Id, "");
else
Callback (Opt.Id, Arg (Equal + 1 .. Arg'Last));
Handler.Option (Opt.Id, Arg (Equal + 1 .. Arg'Last));
end if;
when Required_Argument =>
if Equal = 0 then
if Arg_N = Arg_Count then
if Missing_Argument = null then
Handler.Missing_Argument
raise Option_Error with "Missing argument to "
& "option " & Opt.Long_Name;
else
Missing_Argument (Opt.Id);
end if;
else
Callback (Opt.Id, Argument (Arg_N + 1));
Callback (Opt.Id, Arg (Equal + 1 .. Arg'Last));
Handler.Option (Opt.Id, Arg (Equal + 1 .. Arg'Last));
end if;
end case;
end;
end;
end Process_Long_Option;
begin
while Arg_N <= Arg_Count loop
declare
Arg : constant String := Argument (Arg_N);
begin
if Arg'Length <= 1 or else Arg (Arg'First) /= '-' then
-- This is a non-flag argument, abort option processing if
-- posixly correct.
if Posixly_Correct then
exit;
else
Callback (Top_Level_Argument, Arg);
Handler.Argument (Arg);
Arg_N := Arg_N + 1;
end if;
elsif Arg (Arg'First + 1) = '-' then
-- Argument starting with "--": long option.
-- "--" stops option processing.
if Arg'Length = 2 then
Arg_N := Arg_N + 1;
exit;
end if;
-- Argument starting with "--": long option.
Process_Long_Option (Arg (Arg'First + 2 .. Arg'Last));
Arg_N := Arg_N + 1;
elsif Long_Only then
-- Force long option on a single dash prefix.
Process_Long_Option (Arg (Arg'First + 1 .. Arg'Last));
Arg_N := Arg_N + 1;
else
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declare
Opt : constant Option
:= Short_Option_Maps.Element (Cursor);
begin
if Opt.Has_Arg = Required_Argument then
if Arg_I = Arg'Last then
if Arg_N = Arg_Count then
if Missing_Argument = null then
Handler.Missing_Argument
raise Option_Error with "Missing "
& "argument to option "
& Opt.Short_Name;
else
Missing_Argument (Opt.Id);
end if;
else
Callback (Opt.Id, Argument (Arg_N + 1));
Callback (Opt.Id,
Arg (Arg_I + 1 .. Arg'Last));
Handler.Option
(Opt.Id, Arg (Arg_I + 1 .. Arg'Last));
exit;
end if;
else
Callback (Opt.Id, "");
Handler.Option (Opt.Id, "");
end if;
end;
else
if Unknown_Short_Option = null then
raise Option_Error with "Unknown short option "
& Arg (Arg_I);
else
Unknown_Short_Option (Arg (Arg_I));
end if;
Callback (Top_Level_Argument, Argument (Arg_N));
Handler.Argument (Argument (Arg_N));
Arg_N := Arg_N + 1;
end loop;
end Process;
end Natools.Getopt_Long;
|