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2.1 Character Set
1
The only characters allowed
outside of
comments are the
graphic_characters
and
format_effectors.
Syntax
2
character
::= graphic_character |
format_effector |
other_control_function
3
graphic_character
::= identifier_letter |
digit |
space_character |
special_character
Static Semantics
4
The character repertoire for the text of an Ada
program consists of the collection of characters called the Basic Multilingual
Plane (BMP) of the ISO 10646 Universal Multiple-Octet Coded Character
Set, plus a set of format_effectors
and, in comments only, a set of other_control_functions;
the coded representation for these characters is implementation defined
(it need not be a representation defined within ISO-10646-1).
5
The description of the language definition in
this International Standard uses the graphic symbols defined for Row
00: Basic Latin and Row 00: Latin-1 Supplement of the ISO 10646 BMP;
these correspond to the graphic symbols of ISO 8859-1 (Latin-1); no graphic
symbols are used in this International Standard for characters outside
of Row 00 of the BMP. The actual set of graphic symbols used by an implementation
for the visual representation of the text of an Ada program is not specified.
6
The categories of
characters are defined as follows:
7
- identifier_letter
-
upper_case_identifier_letter | lower_case_identifier_letter
8
- upper_case_identifier_letter
-
Any character of Row 00 of ISO 10646 BMP whose name begins ``Latin Capital
Letter''.
9
- lower_case_identifier_letter
-
Any character of Row 00 of ISO 10646 BMP whose name begins ``Latin Small
Letter''.
10
- digit
-
One of the characters 0, 1, 2, 3, 4, 5, 6, 7, 8, or 9.
11
- space_character
-
The character of ISO 10646 BMP named ``Space''.
12
- special_character
-
Any character of the ISO 10646 BMP that is not reserved for a control
function, and is not the space_character,
an identifier_letter, or a digit.
13
- format_effector
-
The control functions of ISO 6429 called character tabulation (HT), line
tabulation (VT), carriage return (CR), line feed (LF), and form feed
(FF).
14
- other_control_function
-
Any control function, other than a format_effector,
that is allowed in a comment; the set of other_control_functions
allowed in comments is implementation defined.
15
The
following names are used when referring to certain
special_characters:
| symbol | name | symbol | name |
|
| | | | |
|
| " | quotation mark | : | colon |
|
| # | number sign | ; | semicolon |
|
| & | ampersand | < | less-than sign |
|
| ' | apostrophe, tick | = | equals sign |
|
| ( | left parenthesis | > | greater-than sign |
|
| ) | right parenthesis | _ | low line, underline |
|
| * | asterisk, multiply | | | vertical line |
|
| + | plus sign | [ | left square bracket |
|
| , | comma | ] | right square bracket |
|
| - | hyphen-minus, minus | { | left curly bracket |
|
| . | full stop, dot, point | } | right curly bracket |
|
| / | solidus, divide | | |
|
Implementation Permissions
16
In a nonstandard mode, the implementation may
support a different character repertoire; in particular, the set of characters
that are considered identifier_letters
can be extended or changed to conform to local conventions.
17
1 Every code position of
ISO 10646 BMP that is not reserved for a control function is defined
to be a graphic_character by this
International Standard. This includes all code positions other than 0000
- 001F, 007F - 009F, and FFFE - FFFF.
18
2 The language does not
specify the source representation of programs.
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