| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT RUN-TIME COMPONENTS -- |
| -- -- |
| -- S Y S T E M . C A S E _ U T I L -- |
| -- -- |
| -- S p e c -- |
| -- -- |
| -- Copyright (C) 1995-2022, 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. -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| -- Simple casing functions |
| |
| -- This package provides simple casing functions that do not require the |
| -- overhead of the full casing tables found in Ada.Characters.Handling. |
| |
| -- Preconditions in this unit are meant for analysis only, not for run-time |
| -- checking, so that the expected exceptions are raised. This is enforced by |
| -- setting the corresponding assertion policy to Ignore. Postconditions and |
| -- contract cases should not be executed at runtime as well, in order not to |
| -- slow down the execution of these functions. |
| |
| pragma Assertion_Policy (Pre => Ignore, |
| Post => Ignore, |
| Contract_Cases => Ignore, |
| Ghost => Ignore); |
| |
| package System.Case_Util |
| with Pure, SPARK_Mode |
| is |
| -- Note: all the following functions handle the full Latin-1 set |
| |
| function To_Upper (A : Character) return Character |
| with |
| Post => (declare |
| A_Val : constant Natural := Character'Pos (A); |
| begin |
| (if A in 'a' .. 'z' |
| or else A_Val in 16#E0# .. 16#F6# |
| or else A_Val in 16#F8# .. 16#FE# |
| then |
| To_Upper'Result = Character'Val (A_Val - 16#20#) |
| else |
| To_Upper'Result = A)); |
| -- Converts A to upper case if it is a lower case letter, otherwise |
| -- returns the input argument unchanged. |
| |
| procedure To_Upper (A : in out String) |
| with |
| Post => (for all J in A'Range => A (J) = To_Upper (A'Old (J))); |
| |
| function To_Upper (A : String) return String |
| with |
| Post => To_Upper'Result'First = A'First |
| and then To_Upper'Result'Last = A'Last |
| and then (for all J in A'Range => |
| To_Upper'Result (J) = To_Upper (A (J))); |
| -- Folds all characters of string A to upper case |
| |
| function To_Lower (A : Character) return Character |
| with |
| Post => (declare |
| A_Val : constant Natural := Character'Pos (A); |
| begin |
| (if A in 'A' .. 'Z' |
| or else A_Val in 16#C0# .. 16#D6# |
| or else A_Val in 16#D8# .. 16#DE# |
| then |
| To_Lower'Result = Character'Val (A_Val + 16#20#) |
| else |
| To_Lower'Result = A)); |
| -- Converts A to lower case if it is an upper case letter, otherwise |
| -- returns the input argument unchanged. |
| |
| procedure To_Lower (A : in out String) |
| with |
| Post => (for all J in A'Range => A (J) = To_Lower (A'Old (J))); |
| |
| function To_Lower (A : String) return String |
| with |
| Post => To_Lower'Result'First = A'First |
| and then To_Lower'Result'Last = A'Last |
| and then (for all J in A'Range => |
| To_Lower'Result (J) = To_Lower (A (J))); |
| -- Folds all characters of string A to lower case |
| |
| procedure To_Mixed (A : in out String) |
| with |
| Post => |
| (for all J in A'Range => |
| (if J = A'First |
| or else A'Old (J - 1) = '_' |
| then |
| A (J) = To_Upper (A'Old (J)) |
| else |
| A (J) = To_Lower (A'Old (J)))); |
| |
| function To_Mixed (A : String) return String |
| with |
| Post => To_Mixed'Result'First = A'First |
| and then To_Mixed'Result'Last = A'Last |
| and then (for all J in A'Range => |
| (if J = A'First |
| or else A (J - 1) = '_' |
| then |
| To_Mixed'Result (J) = To_Upper (A (J)) |
| else |
| To_Mixed'Result (J) = To_Lower (A (J)))); |
| -- Converts A to mixed case (i.e. lower case, except for initial |
| -- character and any character after an underscore, which are |
| -- converted to upper case. |
| |
| end System.Case_Util; |
