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+------------------------------------------------------------------------------
+-- --
+-- GNAT RUN-TIME COMPONENTS --
+-- --
+-- A D A . W I D E _ C H A R A C T E R S . U N I C O D E --
+-- --
+-- S p e c --
+-- --
+-- Copyright (C) 2005-2012, 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_Character. Note that this
+-- package is strictly speaking Ada 2005 (since it is a child of an
+-- Ada 2005 unit), but we make it available in Ada 95 mode, since it
+-- only deals with wide characters.
+
+with System.UTF_32;
+
+package Ada.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_Character) return Category;
+ pragma Inline (Get_Category);
+ -- Given a 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_Character. The form taking the 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_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_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_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_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_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_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_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_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 corresponding function to
+ -- fold to lower case is also provided.
+
+ function To_Lower_Case (U : Wide_Character) return 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_Character) return 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_Characters.Unicode;