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------------------------------------------------------------------------------

--                                                                          --

--                         GNAT RUN-TIME COMPONENTS                         --

--                                                                          --

--    A D A . W I D E _ W I D E _ C H A R A C T E R T S . U N I C O D E    --

--                                                                          --

--                                 S p e c                                  --

--                                                                          --

--          Copyright (C) 2005-2011, 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.      --

--                                                                          --

------------------------------------------------------------------------------

--  Unicode categorization routines for Wide_Wide_Character

with System.UTF_32;

package Ada.Wide_Wide_Characters.Unicode is

   pragma Pure;

   --  The following type defines the categories from the unicode definitions.

   --  The one addition we make is Fe, which represents the characters FFFE

   --  and FFFF in any of the planes.

   type Category is new System.UTF_32.Category;

   --  Cc   Other, Control

   --  Cf   Other, Format

   --  Cn   Other, Not Assigned

   --  Co   Other, Private Use

   --  Cs   Other, Surrogate

   --  Ll   Letter, Lowercase

   --  Lm   Letter, Modifier

   --  Lo   Letter, Other

   --  Lt   Letter, Titlecase

   --  Lu   Letter, Uppercase

   --  Mc   Mark, Spacing Combining

   --  Me   Mark, Enclosing

   --  Mn   Mark, Nonspacing

   --  Nd   Number, Decimal Digit

   --  Nl   Number, Letter

   --  No   Number, Other

   --  Pc   Punctuation, Connector

   --  Pd   Punctuation, Dash

   --  Pe   Punctuation, Close

   --  Pf   Punctuation, Final quote

   --  Pi   Punctuation, Initial quote

   --  Po   Punctuation, Other

   --  Ps   Punctuation, Open

   --  Sc   Symbol, Currency

   --  Sk   Symbol, Modifier

   --  Sm   Symbol, Math

   --  So   Symbol, Other

   --  Zl   Separator, Line

   --  Zp   Separator, Paragraph

   --  Zs   Separator, Space

   --  Fe   relative position FFFE/FFFF in plane

   function Get_Category (U : Wide_Wide_Character) return Category;

   pragma Inline (Get_Category);

   --  Given a Wide_Wide_Character, returns corresponding Category, or Cn if

   --  the code does not have an assigned unicode category.

   --  The following functions perform category tests corresponding to lexical

   --  classes defined in the Ada standard. There are two interfaces for each

   --  function. The second takes a Category (e.g. returned by Get_Category).

   --  The first takes a Wide_Wide_Character. The form taking the

   --  Wide_Wide_Character is typically more efficient than calling

   --  Get_Category, but if several different tests are to be performed on the

   --  same code, it is more efficient to use Get_Category to get the category,

   --  then test the resulting category.

   function Is_Letter (U : Wide_Wide_Character) return Boolean;

   function Is_Letter (C : Category)            return Boolean;

   pragma Inline (Is_Letter);

   --  Returns true iff U is a letter that can be used to start an identifier,

   --  or if C is one of the corresponding categories, which are the following:

   --    Letter, Uppercase (Lu)

   --    Letter, Lowercase (Ll)

   --    Letter, Titlecase (Lt)

   --    Letter, Modifier  (Lm)

   --    Letter, Other     (Lo)

   --    Number, Letter    (Nl)

   function Is_Digit (U : Wide_Wide_Character) return Boolean;

   function Is_Digit (C : Category)            return Boolean;

   pragma Inline (Is_Digit);

   --  Returns true iff U is a digit that can be used to extend an identifer,

   --  or if C is one of the corresponding categories, which are the following:

   --    Number, Decimal_Digit (Nd)

   function Is_Line_Terminator (U : Wide_Wide_Character) return Boolean;

   pragma Inline (Is_Line_Terminator);

   --  Returns true iff U is an allowed line terminator for source programs,

   --  if U is in the category Zp (Separator, Paragaph), or Zs (Separator,

   --  Line), or if U is a conventional line terminator (CR, LF, VT, FF).

   --  There is no category version for this function, since the set of

   --  characters does not correspond to a set of Unicode categories.

   function Is_Mark (U : Wide_Wide_Character) return Boolean;

   function Is_Mark (C : Category)            return Boolean;

   pragma Inline (Is_Mark);

   --  Returns true iff U is a mark character which can be used to extend an

   --  identifier, or if C is one of the corresponding categories, which are

   --  the following:

   --    Mark, Non-Spacing (Mn)

   --    Mark, Spacing Combining (Mc)

   function Is_Other (U : Wide_Wide_Character) return Boolean;

   function Is_Other (C : Category)            return Boolean;

   pragma Inline (Is_Other);

   --  Returns true iff U is an other format character, which means that it

   --  can be used to extend an identifier, but is ignored for the purposes of

   --  matching of identiers, or if C is one of the corresponding categories,

   --  which are the following:

   --    Other, Format (Cf)

   function Is_Punctuation (U : Wide_Wide_Character) return Boolean;

   function Is_Punctuation (C : Category)            return Boolean;

   pragma Inline (Is_Punctuation);

   --  Returns true iff U is a punctuation character that can be used to

   --  separate pices of an identifier, or if C is one of the corresponding

   --  categories, which are the following:

   --    Punctuation, Connector (Pc)

   function Is_Space (U : Wide_Wide_Character) return Boolean;

   function Is_Space (C : Category)            return Boolean;

   pragma Inline (Is_Space);

   --  Returns true iff U is considered a space to be ignored, or if C is one

   --  of the corresponding categories, which are the following:

   --    Separator, Space (Zs)

   function Is_Non_Graphic (U : Wide_Wide_Character) return Boolean;

   function Is_Non_Graphic (C : Category)            return Boolean;

   pragma Inline (Is_Non_Graphic);

   --  Returns true iff U is considered to be a non-graphic character, or if C

   --  is one of the corresponding categories, which are the following:

   --    Other, Control (Cc)

   --    Other, Private Use (Co)

   --    Other, Surrogate (Cs)

   --    Separator, Line (Zl)

   --    Separator, Paragraph (Zp)

   --    FFFE or FFFF positions in any plane (Fe)

   --

   --  Note that the Ada category format effector is subsumed by the above

   --  list of Unicode categories.

   --

   --  Note that Other, Unassiged (Cn) is quite deliberately not included

   --  in the list of categories above. This means that should any of these

   --  code positions be defined in future with graphic characters they will

   --  be allowed without a need to change implementations or the standard.

   --

   --  Note that Other, Format (Cf) is also quite deliberately not included

   --  in the list of categories above. This means that these characters can

   --  be included in character and string literals.

   --  The following function is used to fold to upper case, as required by

   --  the Ada 2005 standard rules for identifier case folding. Two

   --  identifiers are equivalent if they are identical after folding all

   --  letters to upper case using this routine. A fold to lower routine is

   --  also provided.

   function To_Lower_Case

     (U : Wide_Wide_Character) return Wide_Wide_Character;

   pragma Inline (To_Lower_Case);

   --  If U represents an upper case letter, returns the corresponding lower

   --  case letter, otherwise U is returned unchanged. The folding is locale

   --  independent as defined by documents referenced in the note in section

   --  1 of ISO/IEC 10646:2003

   function To_Upper_Case

     (U : Wide_Wide_Character) return Wide_Wide_Character;

   pragma Inline (To_Upper_Case);

   --  If U represents a lower case letter, returns the corresponding upper

   --  case letter, otherwise U is returned unchanged. The folding is locale

   --  independent as defined by documents referenced in the note in section

   --  1 of ISO/IEC 10646:2003

end Ada.Wide_Wide_Characters.Unicode;