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------------------------------------------------------------------------
-- --
-- McKae Software Utilities --
-- --
-- Copyright (C) 2003 McKae Technologies --
-- --
-- The McKae software utilities are free software; you can --
-- redistribute it and/or modify it under terms of the GNU General --
-- Public License as published by the Free Software Foundation; --
-- either version 2, or (at your option) any later version. McKae --
-- Software Utilities are distributed in the hope that they 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 distributed --
-- with DTraq; see file COPYING. If not, write to the Free Software --
-- Foundation, 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. --
-- --
-- The McKae Software Utilities are maintained by McKae Technologies --
-- (http://www.mckae.com). --
------------------------------------------------------------------------
with Ada.Strings.Bounded;
generic
type Command_Line_Components is (<>);
-- The discrete type to which options correspond.
Max_Options : Natural := 100;
-- This should be altered only if an excessive number of options
-- are required.
Max_Option_Length : Positive := 20;
-- If options may take the form of strings, this is the maximum
-- length of such a string.
Max_Argument_Length : Positive := 255;
-- The maximum length of an argument.
Option_Designation : String := "-";
-- Character(s) designating an option string. Add to or modify as
-- needed. Note: "+-" are commonly used option designators to signify
-- options that can be turned on or off.
package Mckae.Environment.Command_Line_Processor is
-----------------------------------------------------------------------
--
-- Name: Command_Line_Processor
-- Author: Marc A. Criley
-- Date: 06 May 1996
--
-- Abstract: Associate command line options to members of an application-
-- defined scalar type, along with providing simple access to arguments.
-- Supports case (in)sensitivity, option arguments, and configurable option
-- designator(s), usage description, and error handling.
--
-- Contact: mcriley@acm.org
--
-- This software may be freely distributed.
-----------------------------------------------------------------------
--
-- Usage (see simple_cli.adb for a working example):
--
-- 1) Define a scalar type with which command line options will be
-- associated.
--
-- 2) Instantiate this package, supplying that type and specifying any other
-- applicable settings accessible in the generic parameters.
--
-- 3a) Declare a variable or constant of type Command_Line_Item_Mappings
-- with the initializing aggregate that will implicitly supply the index
-- range for the array, or,
--
-- 3b) Declare a variable of type Command_Line_Item_Mappings, specifying an
-- index range corresponding to the number of options that will be
-- recognized and, optionally, an initializing aggregate.
--
-- 4) Supply values for the initializing aggregate (or if an initializing
-- aggregate was not used, initialize the variable in the body of the code)
-- by calling the Set_Option function for each of the options to be
-- recognized. Specify the member of the "option type" to be associated with
-- a command line option, the option character or string, whether
-- recognizing that option is case sensitive, and whether the option
-- requires an argument. Note that more than one option representation can
-- be associated with the same member of the option type.
--
-- 5) Install the command line item mapping by calling
-- Install_Option_Mappings with the variable or constant.
--
-- 6) Set any special USAGE or error handling by calling the appropriate
-- procedures.
--
-- 7) In the body of the application where the command line options and
-- arguments are processed, set up a loop in which Next_Item is called in
-- each iteration.
--
-- 8) Process the response from each call to Next_Item. Next_Item returns an
-- object of type Command_Line_Items, the discriminant of which, Item_Kind,
-- indicates whether an option or argument is being returned, if help was
-- requested, if an error occurred, or if all command line items have been
-- processed. See the definition of Command_Line_Items regarding the format
-- of the data it returns.
--
-----------------------------------------------------------------------
--
-- These types and subprograms implement the mapping between option
-- identifiers and the corresponding type members.
--
type Item_Mappings is private;
type Command_Line_Item_Mappings is array (Natural range <>) of
Item_Mappings;
-- Associate a member item of the type defining the command line options
-- with the character indicating that option. Set Case_Sensitive as
-- appropriate and Argumentable if the option requires an argument.
function Set_Option (Item : Command_Line_Components;
Identifier : Character;
Case_Sensitive : Boolean := True;
Argumented : Boolean := False)
return Item_Mappings;
-- As above, but with an identifier string being associated with the option.
function Set_Option (Item : Command_Line_Components;
Identifier : String;
Case_Sensitive : Boolean := True;
Argumented : Boolean := False)
return Item_Mappings;
-- Install the mapping. Successive calls to this procedure replace previous
-- mappings. If there is a problem during installation, the
-- Option_Specification_Error exception is raised.
procedure Install_Option_Mappings
(Mappings : Command_Line_Item_Mappings);
Option_Specification_Error : exception;
-- Raised if there is a problem setting up an option configuration or
-- installing it. This would be raised by mapping the same option
-- identifier to two different option type members, or if one letter case of
-- an option was specified as case-sensitive and the other as
-- case-insensitive, if the length of an option string exceeded the
-- Max_Option_Length, or if more than Max_Options were defined.
-----------------------------------------------------------------------
--
-- The following procedures adjust the command line processor's interaction
-- with users.
--
-----------------------------------------------------------------------
-----------------------------------------------------------------------
--
-- The Set_Usage procedures permit supplying either a string specifying the
-- program's proper usage profile (which is the default action), or a
-- parameterless procedure for more extensive interaction. The string is
-- displayed, or the usage procedure invoked, upon encountering the option
-- "-h", "-help", or "-?"; or the single argument "help" or "?".
--
-----------------------------------------------------------------------
procedure Set_Usage (Usage_String : String := "USAGE: No information.");
type Usage_Procedure_Profile is access procedure;
procedure Set_Usage (Usage_Procedure : Usage_Procedure_Profile);
-----------------------------------------------------------------------
--
-- Set_Invalid_Options_Message and Set_Omitted_Argument_Message permit the
-- specification of a message appropriate to encountering invalid options or
-- finding that no argument was supplied for an option that requires one.
-- To specify that no message at all is to be supplied for errors, invoke
-- this procedure with a null string as the Error_Message.
--
-- Normally, processing of the command line ends after encountering an
-- error. To continue, as in the case when unrecognized options are to
-- be passed on to another program, call Ignore_Unrecognized_Options.
-- When an unrecognized option is encountered, no further processing
-- within that block of options will occur, processing will resume with
-- the subsequent block. Upon encountering an unrecognized option,
-- Next_Item (see below) will return CLI_Error and the Unknown_Option
-- field will contain that entire option block, even if some of the
-- initial characters did correspond to recognized options. PROCEED
-- WITH CAUTION AFTER TURNING OFF OPTION ERROR RECOGNITION.
--
-----------------------------------------------------------------------
procedure Set_Invalid_Options_Message
(Error_Message : String := "Unrecognized option(s)";
Display_Usage : Boolean := True);
procedure Ignore_Unrecognized_Options (Ignore : Boolean := True);
procedure Set_Omitted_Argument_Message
(Error_Message : String := "Missing argument";
Display_Usage : Boolean := True);
-----------------------------------------------------------------------
--
-- The following type declarations define the format in which the
-- options and arguments are returned to the calling routine.
--
-- Arguments, supplied as such or as an argument associated with an
-- option, are stored as a Bounded_Strings whose maximum length may be
-- adjusted during instantiation.
--
-- The Command_Line_Item_Kinds indicates what is being returned to the
-- caller:
-- 'CLI_Option' is accompanied by the value of the Command_Line_Components
-- type corresponding to that option. If the option has been
-- designated as one which itself has an argument, that argument
-- is returned as well.
--
-- 'CLI_Argument' returns a bounded string containing the argument.
--
-- 'CLI_Help_Requested' indicates that usage help was requested, so it is
-- likely that the application should simply exit.
--
-- 'CLI_Complete' indicates there are no further options or arguments,
-- including indicating that none were supplied at all.
--
-- 'CLI_Option_Error' is returned when a supplied option is unrecognized.
-- The unrecognized option is returned as well.
-- Immediately prior to returning this result, the displaying of
-- the invalid options message is triggered.
--
-----------------------------------------------------------------------
package Argument_Strings is
new Ada.Strings.Bounded.Generic_Bounded_Length
(Max => Max_Argument_Length);
package Option_Strings is new Ada.Strings.Bounded.Generic_Bounded_Length
(Max => Max_Option_Length);
type Command_Line_Item_Kinds is
(CLI_Option,
CLI_Argument,
CLI_Help_Requested,
CLI_Complete,
CLI_Option_Error);
type Command_Line_Items (Item_Kind : Command_Line_Item_Kinds := CLI_Complete)
is record
case Item_Kind is
when CLI_Option =>
Option : Command_Line_Components;
Option_Argument : Argument_Strings.Bounded_String;
Option_Designator : Character;
-- The Option_Designator is the character preceding the
-- option block. As such, it will take on only those
-- values supplied by the Option_Designation parameter.
when CLI_Argument =>
Argument : Argument_Strings.Bounded_String;
when CLI_Help_Requested | CLI_Complete =>
null;
when CLI_Option_Error =>
Unknown_Option : Option_Strings.Bounded_String;
Unknown_Option_Designator : Character;
end case;
end record;
-----------------------------------------------------------------------
--
-- These functions return the components of the command line invocation.
--
-----------------------------------------------------------------------
-- Returns a value corresponding to the name of the program.
function Command_Name return String;
-- Returns the next option or argument supplied on the command line.
-- Options and arguments may be specified in any order on the command line,
-- although whatever follows an option that requires an argument is taken to
-- be the argument.
function Next_Item return Command_Line_Items;
-- Return the entire command line as submitted to the application
function Command_Line return String;
-----------------------------------------------------------------------
private
type Item_Mappings is record
Item : Command_Line_Components;
Identifier : Option_Strings.Bounded_String;
Case_Sensitive : Boolean := True;
Argumented : Boolean := False;
end record;
end Mckae.Environment.Command_Line_Processor;
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