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181 | -- -*- coding: utf-8 -*-
--
-- ZanyBlue, an Ada library and framework for finite element analysis.
--
-- Copyright (c) 2012, 2017, Michael Rohan <mrohan@zanyblue.com>
-- All rights reserved.
--
-- Redistribution and use in source and binary forms, with or without
-- modification, are permitted provided that the following conditions
-- are met:
--
-- * Redistributions of source code must retain the above copyright
-- notice, this list of conditions and the following disclaimer.
--
-- * Redistributions in binary form must reproduce the above copyright
-- notice, this list of conditions and the following disclaimer in the
-- documentation and/or other materials provided with the distribution.
--
-- * Neither the name of ZanyBlue nor the names of its contributors may
-- be used to endorse or promote products derived from this software
-- without specific prior written permission.
--
-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-- "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-- LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-- A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-- HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-- SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
-- TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
-- PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
-- LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-- NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-- SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
--
-- @usage getenv [ -l | -s | -p | -a ] name [ parameter ]
-- @summary define a parameter based on an environment variable
-- @start-doc
-- Define an internal parameter based on the value of an environment
-- variable. For example,::
--
-- ZBTest> print HOME
-- The parameter "HOME" is not defined
-- ZBTest> getenv HOME
-- ZBTest> print HOME
-- /u/mrohan
--
-- The options available are
--
-- -l
-- Define an internal list parameter by splitting on the pathsep
--
-- -s
-- Define a simple scalar (string) parameter (default)
--
-- -a
-- Append the values (implies the -l option)
--
-- -p
-- Prepend the values (implies the -l option)
--
-- If the target is not given then import to name.
--
with Ada.Environment_Variables;
separate (ZBTest.Commands)
procedure Getenv_Command
(State : in out State_Type;
Args : List_Type)
is
use Ada.Environment_Variables;
procedure Get_List_Value
(State : in out State_Type;
Source : String;
Target : String;
Append_Values : Boolean);
-- Get an environment variable as a list value.
--------------------
-- Get_List_Value --
--------------------
procedure Get_List_Value
(State : in out State_Type;
Source : String;
Target : String;
Append_Values : Boolean)
is
procedure Parse_Values
(List_Values : in out List_Type;
Definition : String);
------------------
-- Parse_Values --
------------------
procedure Parse_Values
(List_Values : in out List_Type;
Definition : String)
is
PSep : constant Unicode_Character := State.Get_Character ("_pathsep");
Start : Positive := Definition'First;
Next : Positive := Definition'First;
begin
while Next <= Definition'Last loop
if Definition (Next) = PSep then
Append (List_Values, Definition (Start .. Next - 1));
Start := Next + 1;
end if;
Next := Next + 1;
end loop;
Append (List_Values, Definition (Start .. Next - 1));
end Parse_Values;
List_Values : List_Type;
begin -- Get_List_Value
if Exists (Wide_To_UTF8 (Source)) then
Parse_Values
(List_Values, To_Wide_String (Value (Wide_To_UTF8 (Source))));
if Append_Values then
for I in 1 .. Length (List_Values) loop
State.Append (Target, Value (List_Values, I));
end loop;
else
for I in reverse 1 .. Length (List_Values) loop
State.Prepend (Target, Value (List_Values, I));
end loop;
end if;
else
Print_10007 (+Source);
end if;
end Get_List_Value;
Get_To_List : Boolean := False;
Append_Values : Boolean := True;
Source_Idx : Natural := 0;
Target_Idx : Natural := 0;
begin
for I in 2 .. Length (Args) loop
if Value (Args, I) = "-l" then
Get_To_List := True;
elsif Value (Args, I) = "-s" then
Get_To_List := False;
elsif Value (Args, I) = "-a" then
Get_To_List := True;
Append_Values := True;
elsif Value (Args, I) = "-p" then
Get_To_List := True;
Append_Values := False;
elsif Source_Idx = 0 then
Source_Idx := I;
elsif Target_Idx = 0 then
Target_Idx := I;
else
raise Command_Usage_Error;
end if;
end loop;
if Source_Idx = 0 then
raise Command_Usage_Error;
end if;
if Target_Idx = 0 then
Target_Idx := Source_Idx;
end if;
if Get_To_List then
Get_List_Value
(State, Value (Args, Source_Idx), Value (Args, Target_Idx),
Append_Values);
else
State.Set_String
(Value (Args, Target_Idx),
To_Wide_String (Value (Wide_To_UTF8 (Value (Args, Source_Idx)))));
end if;
end Getenv_Command;
|