| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT COMPILER COMPONENTS -- |
| -- -- |
| -- S Y S T E M . V A L _ B O O L -- |
| -- -- |
| -- B o d y -- |
| -- -- |
| -- Copyright (C) 1992-2023, Free Software Foundation, Inc. -- |
| -- -- |
| -- GNAT is free software; you can redistribute it and/or modify it under -- |
| -- terms of the GNU General Public License as published by the Free Soft- -- |
| -- ware Foundation; either version 3, or (at your option) any later ver- -- |
| -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- |
| -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- |
| -- or FITNESS FOR A PARTICULAR PURPOSE. -- |
| -- -- |
| -- As a special exception under Section 7 of GPL version 3, you are granted -- |
| -- additional permissions described in the GCC Runtime Library Exception, -- |
| -- version 3.1, as published by the Free Software Foundation. -- |
| -- -- |
| -- You should have received a copy of the GNU General Public License and -- |
| -- a copy of the GCC Runtime Library Exception along with this program; -- |
| -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- |
| -- <http://www.gnu.org/licenses/>. -- |
| -- -- |
| -- GNAT was originally developed by the GNAT team at New York University. -- |
| -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| -- Ghost code, loop invariants and assertions in this unit are meant for |
| -- analysis only, not for run-time checking, as it would be too costly |
| -- otherwise. This is enforced by setting the assertion policy to Ignore. |
| |
| pragma Assertion_Policy (Ghost => Ignore, |
| Loop_Invariant => Ignore, |
| Assert => Ignore); |
| |
| with System.Val_Util; use System.Val_Util; |
| |
| package body System.Val_Bool |
| with SPARK_Mode |
| is |
| |
| ------------------- |
| -- Value_Boolean -- |
| ------------------- |
| |
| function Value_Boolean (Str : String) return Boolean is |
| F : Integer; |
| L : Integer; |
| S : String (Str'Range) := Str; |
| |
| begin |
| Normalize_String (S, F, L); |
| |
| pragma Assert (F = System.Val_Util.First_Non_Space_Ghost |
| (S, Str'First, Str'Last)); |
| |
| if S (F .. L) = "TRUE" then |
| return True; |
| |
| elsif S (F .. L) = "FALSE" then |
| return False; |
| |
| else |
| Bad_Value (Str); |
| end if; |
| end Value_Boolean; |
| |
| end System.Val_Bool; |
