1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
|
------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- S Y S T E M . U T F _ 3 2 --
-- --
-- S p e c --
-- --
-- Copyright (C) 2005-2010, 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. --
-- --
------------------------------------------------------------------------------
-- This package is an internal package that provides basic character
-- classification capabilities needed by the compiler for handling full
-- 32-bit wide wide characters. We avoid the use of the actual type
-- Wide_Wide_Character, since we want to use these routines in the compiler
-- itself, and we want to be able to compile the compiler with old versions
-- of GNAT that did not implement Wide_Wide_Character.
-- System.UTF_32 should not be directly used from an application program, but
-- an equivalent package GNAT.UTF_32 can be used directly and provides exactly
-- the same services. The reason this package is in System is so that it can
-- with'ed by other packages in the Ada and System hierarchies.
pragma Compiler_Unit;
package System.UTF_32 is
type UTF_32 is range 0 .. 16#7FFF_FFFF#;
-- So far, the only defined character codes are in 0 .. 16#01_FFFF#
-- 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 (
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 any plane
function Get_Category (U : UTF_32) return Category;
-- Given a UTF32 code, 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 UTF_32 code. The form taking the UTF_32 code 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_UTF_32_Letter (U : UTF_32) return Boolean;
function Is_UTF_32_Letter (C : Category) return Boolean;
pragma Inline (Is_UTF_32_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_UTF_32_Digit (U : UTF_32) return Boolean;
function Is_UTF_32_Digit (C : Category) return Boolean;
pragma Inline (Is_UTF_32_Digit);
-- Returns true iff U is a digit that can be used to extend an identifier,
-- or if C is one of the corresponding categories, which are the following:
-- Number, Decimal_Digit (Nd)
function Is_UTF_32_Line_Terminator (U : UTF_32) return Boolean;
pragma Inline (Is_UTF_32_Line_Terminator);
-- Returns true iff U is an allowed line terminator for source programs,
-- if U is in the category Zp (Separator, Paragraph), 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_UTF_32_Mark (U : UTF_32) return Boolean;
function Is_UTF_32_Mark (C : Category) return Boolean;
pragma Inline (Is_UTF_32_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_UTF_32_Other (U : UTF_32) return Boolean;
function Is_UTF_32_Other (C : Category) return Boolean;
pragma Inline (Is_UTF_32_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 identifiers, or if C is one of the corresponding categories,
-- which are the following:
-- Other, Format (Cf)
function Is_UTF_32_Punctuation (U : UTF_32) return Boolean;
function Is_UTF_32_Punctuation (C : Category) return Boolean;
pragma Inline (Is_UTF_32_Punctuation);
-- Returns true iff U is a punctuation character that can be used to
-- separate pieces of an identifier, or if C is one of the corresponding
-- categories, which are the following:
-- Punctuation, Connector (Pc)
function Is_UTF_32_Space (U : UTF_32) return Boolean;
function Is_UTF_32_Space (C : Category) return Boolean;
pragma Inline (Is_UTF_32_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_UTF_32_Non_Graphic (U : UTF_32) return Boolean;
function Is_UTF_32_Non_Graphic (C : Category) return Boolean;
pragma Inline (Is_UTF_32_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, Unassigned (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 routine to
-- fold to lower case is also provided.
function UTF_32_To_Lower_Case (U : UTF_32) return UTF_32;
pragma Inline (UTF_32_To_Lower_Case);
-- If U represents an upper case letter, returns the corresponding lower
-- case letter, otherwise U is returned unchanged. The folding rule is
-- simply that if the code corresponds to a 10646 entry whose name contains
-- the string CAPITAL LETTER, and there is a corresponding entry whose name
-- is the same but with CAPITAL LETTER replaced by SMALL LETTER, then the
-- code is folded to this SMALL LETTER code. Otherwise the input code is
-- returned unchanged.
function UTF_32_To_Upper_Case (U : UTF_32) return UTF_32;
pragma Inline (UTF_32_To_Upper_Case);
-- If U represents a lower case letter, returns the corresponding lower
-- case letter, otherwise U is returned unchanged. The folding rule is
-- simply that if the code corresponds to a 10646 entry whose name contains
-- the string SMALL LETTER, and there is a corresponding entry whose name
-- is the same but with SMALL LETTER replaced by CAPITAL LETTER, then the
-- code is folded to this CAPITAL LETTER code. Otherwise the input code is
-- returned unchanged.
end System.UTF_32;
|
