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1 281 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                         GNAT RUN-TIME COMPONENTS                         --
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--                                                                          --
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--    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    --
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--                                                                          --
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--                                 S p e c                                  --
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--                                                                          --
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--          Copyright (C) 2005-2009, Free Software Foundation, Inc.         --
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--                                                                          --
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-- GNAT is free software;  you can  redistribute it  and/or modify it under --
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-- terms of the  GNU General Public License as published  by the Free Soft- --
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-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
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-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
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--                                                                          --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception,   --
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-- version 3.1, as published by the Free Software Foundation.               --
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--                                                                          --
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-- You should have received a copy of the GNU General Public License and    --
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-- a copy of the GCC Runtime Library Exception along with this program;     --
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-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
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-- <http://www.gnu.org/licenses/>.                                          --
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--                                                                          --
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-- GNAT was originally developed  by the GNAT team at  New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc.      --
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--                                                                          --
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------------------------------------------------------------------------------
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--  Unicode categorization routines for Wide_Wide_Character
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with System.UTF_32;
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package Ada.Wide_Wide_Characters.Unicode is
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   --  The following type defines the categories from the unicode definitions.
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   --  The one addition we make is Fe, which represents the characters FFFE
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   --  and FFFF in any of the planes.
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   type Category is new System.UTF_32.Category;
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   --  Cc   Other, Control
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   --  Cf   Other, Format
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   --  Cn   Other, Not Assigned
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   --  Co   Other, Private Use
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   --  Cs   Other, Surrogate
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   --  Ll   Letter, Lowercase
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   --  Lm   Letter, Modifier
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   --  Lo   Letter, Other
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   --  Lt   Letter, Titlecase
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   --  Lu   Letter, Uppercase
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   --  Mc   Mark, Spacing Combining
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   --  Me   Mark, Enclosing
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   --  Mn   Mark, Nonspacing
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   --  Nd   Number, Decimal Digit
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   --  Nl   Number, Letter
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   --  No   Number, Other
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   --  Pc   Punctuation, Connector
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   --  Pd   Punctuation, Dash
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   --  Pe   Punctuation, Close
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   --  Pf   Punctuation, Final quote
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   --  Pi   Punctuation, Initial quote
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   --  Po   Punctuation, Other
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   --  Ps   Punctuation, Open
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   --  Sc   Symbol, Currency
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   --  Sk   Symbol, Modifier
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   --  Sm   Symbol, Math
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   --  So   Symbol, Other
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   --  Zl   Separator, Line
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   --  Zp   Separator, Paragraph
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   --  Zs   Separator, Space
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   --  Fe   relative position FFFE/FFFF in plane
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   function Get_Category (U : Wide_Wide_Character) return Category;
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   pragma Inline (Get_Category);
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   --  Given a Wide_Wide_Character, returns corresponding Category, or Cn if
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   --  the code does not have an assigned unicode category.
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   --  The following functions perform category tests corresponding to lexical
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   --  classes defined in the Ada standard. There are two interfaces for each
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   --  function. The second takes a Category (e.g. returned by Get_Category).
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   --  The first takes a Wide_Wide_Character. The form taking the
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   --  Wide_Wide_Character is typically more efficient than calling
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   --  Get_Category, but if several different tests are to be performed on the
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   --  same code, it is more efficient to use Get_Category to get the category,
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   --  then test the resulting category.
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   function Is_Letter (U : Wide_Wide_Character) return Boolean;
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   function Is_Letter (C : Category)            return Boolean;
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   pragma Inline (Is_Letter);
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   --  Returns true iff U is a letter that can be used to start an identifier,
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   --  or if C is one of the corresponding categories, which are the following:
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   --    Letter, Uppercase (Lu)
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   --    Letter, Lowercase (Ll)
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   --    Letter, Titlecase (Lt)
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   --    Letter, Modifier  (Lm)
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   --    Letter, Other     (Lo)
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   --    Number, Letter    (Nl)
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   function Is_Digit (U : Wide_Wide_Character) return Boolean;
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   function Is_Digit (C : Category)            return Boolean;
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   pragma Inline (Is_Digit);
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   --  Returns true iff U is a digit that can be used to extend an identifer,
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   --  or if C is one of the corresponding categories, which are the following:
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   --    Number, Decimal_Digit (Nd)
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   function Is_Line_Terminator (U : Wide_Wide_Character) return Boolean;
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   pragma Inline (Is_Line_Terminator);
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   --  Returns true iff U is an allowed line terminator for source programs,
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   --  if U is in the category Zp (Separator, Paragaph), or Zs (Separator,
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   --  Line), or if U is a conventional line terminator (CR, LF, VT, FF).
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   --  There is no category version for this function, since the set of
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   --  characters does not correspond to a set of Unicode categories.
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   function Is_Mark (U : Wide_Wide_Character) return Boolean;
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   function Is_Mark (C : Category)            return Boolean;
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   pragma Inline (Is_Mark);
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   --  Returns true iff U is a mark character which can be used to extend an
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   --  identifier, or if C is one of the corresponding categories, which are
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   --  the following:
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   --    Mark, Non-Spacing (Mn)
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   --    Mark, Spacing Combining (Mc)
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   function Is_Other (U : Wide_Wide_Character) return Boolean;
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   function Is_Other (C : Category)            return Boolean;
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   pragma Inline (Is_Other);
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   --  Returns true iff U is an other format character, which means that it
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   --  can be used to extend an identifier, but is ignored for the purposes of
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   --  matching of identiers, or if C is one of the corresponding categories,
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   --  which are the following:
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   --    Other, Format (Cf)
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   function Is_Punctuation (U : Wide_Wide_Character) return Boolean;
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   function Is_Punctuation (C : Category)            return Boolean;
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   pragma Inline (Is_Punctuation);
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   --  Returns true iff U is a punctuation character that can be used to
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   --  separate pices of an identifier, or if C is one of the corresponding
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   --  categories, which are the following:
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   --    Punctuation, Connector (Pc)
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   function Is_Space (U : Wide_Wide_Character) return Boolean;
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   function Is_Space (C : Category)            return Boolean;
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   pragma Inline (Is_Space);
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   --  Returns true iff U is considered a space to be ignored, or if C is one
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   --  of the corresponding categories, which are the following:
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   --    Separator, Space (Zs)
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   function Is_Non_Graphic (U : Wide_Wide_Character) return Boolean;
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   function Is_Non_Graphic (C : Category)            return Boolean;
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   pragma Inline (Is_Non_Graphic);
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   --  Returns true iff U is considered to be a non-graphic character, or if C
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   --  is one of the corresponding categories, which are the following:
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   --    Other, Control (Cc)
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   --    Other, Private Use (Co)
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   --    Other, Surrogate (Cs)
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   --    Separator, Line (Zl)
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   --    Separator, Paragraph (Zp)
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   --    FFFE or FFFF positions in any plane (Fe)
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   --
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   --  Note that the Ada category format effector is subsumed by the above
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   --  list of Unicode categories.
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   --
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   --  Note that Other, Unassiged (Cn) is quite deliberately not included
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   --  in the list of categories above. This means that should any of these
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   --  code positions be defined in future with graphic characters they will
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   --  be allowed without a need to change implementations or the standard.
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   --
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   --  Note that Other, Format (Cf) is also quite deliberately not included
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   --  in the list of categories above. This means that these characters can
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   --  be included in character and string literals.
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   --  The following function is used to fold to upper case, as required by
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   --  the Ada 2005 standard rules for identifier case folding. Two
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   --  identifiers are equivalent if they are identical after folding all
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   --  letters to upper case using this routine.
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   function To_Upper_Case
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     (U : Wide_Wide_Character) return Wide_Wide_Character;
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   pragma Inline (To_Upper_Case);
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   --  If U represents a lower case letter, returns the corresponding upper
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   --  case letter, otherwise U is returned unchanged. The folding is locale
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   --  independent as defined by documents referenced in the note in section
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   --  1 of ISO/IEC 10646:2003
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end Ada.Wide_Wide_Characters.Unicode;

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