@c -*-texinfo-*-
@c This is part of the GNU Emacs Lisp Reference Manual.
-@c Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1998 Free Software Foundation, Inc.
+@c Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1998, 1999
+@c Free Software Foundation, Inc.
@c See the file elisp.texi for copying conditions.
@setfilename ../info/objects
@node Lisp Data Types, Numbers, Introduction, Top
The range of values for integers in Emacs Lisp is @minus{}134217728 to
134217727 (28 bits; i.e.,
-@ifinfo
+@ifnottex
-2**27
-@end ifinfo
+@end ifnottex
@tex
@math{-2^{27}}
@end tex
to
-@ifinfo
+@ifnottex
2**27 - 1)
-@end ifinfo
+@end ifnottex
@tex
@math{2^{28}-1})
@end tex
Characters in strings, buffers, and files are currently limited to the
range of 0 to 524287---nineteen bits. But not all values in that range
-are valid character codes. Codes 0 through 127 are ASCII codes; the
-rest are non-ASCII (@pxref{Non-ASCII Characters}). Characters that represent
+are valid character codes. Codes 0 through 127 are @sc{ascii} codes; the
+rest are non-@sc{ascii} (@pxref{Non-ASCII Characters}). Characters that represent
keyboard input have a much wider range, to encode modifier keys such as
Control, Meta and Shift.
@tex
@math{2^{26}}
@end tex
-@ifinfo
+@ifnottex
2**26
-@end ifinfo
+@end ifnottex
bit as well as the code for the corresponding non-control
character. Ordinary terminals have no way of generating non-@sc{ascii}
control characters, but you can generate them straightforwardly using X
@tex
@math{2^{27}}
@end tex
-@ifinfo
+@ifnottex
2**27
-@end ifinfo
+@end ifnottex
bit set (which on most machines makes it a negative number). We
use high bits for this and other modifiers to make possible a wide range
of basic character codes.
@tex
@math{2^{7}}
@end tex
-@ifinfo
+@ifnottex
2**7
-@end ifinfo
-bit attached to an ASCII character indicates a meta character; thus, the
+@end ifnottex
+bit attached to an @sc{ascii} character indicates a meta character; thus, the
meta characters that can fit in a string have codes in the range from
128 to 255, and are the meta versions of the ordinary @sc{ascii}
characters. (In Emacs versions 18 and older, this convention was used
@tex
@math{2^{25}}
@end tex
-@ifinfo
+@ifnottex
2**25
-@end ifinfo
+@end ifnottex
bit to indicate that the shift key was used in typing a control
character. This distinction is possible only when you use X terminals
or other special terminals; ordinary terminals do not report the
Numerically, the
bit values are @math{2^{22}} for alt, @math{2^{23}} for super and @math{2^{24}} for hyper.
@end tex
-@ifinfo
+@ifnottex
Numerically, the
bit values are 2**22 for alt, 2**23 for super and 2**24 for hyper.
-@end ifinfo
+@end ifnottex
@cindex @samp{\} in character constant
@cindex backslash in character constant
@iftex
@samp{@`a}.
@end iftex
-@ifinfo
+@ifnottex
@samp{a} with grave accent.
-@end ifinfo
+@end ifnottex
A backslash is allowed, and harmless, preceding any character without
a special escape meaning; thus, @samp{?\+} is equivalent to @samp{?+}.
Similarly, the three-element list @code{(rose violet buttercup)}
is equivalent to @code{(rose . (violet . (buttercup)))}.
-@ifinfo
+@ifnottex
It looks like this:
@example
--> rose --> violet --> buttercup
@end group
@end example
-@end ifinfo
+@end ifnottex
@node Association List Type
@comment node-name, next, previous, up
@end example
@node Non-ASCII in Strings
-@subsubsection Non-ASCII Characters in Strings
+@subsubsection Non-@sc{ascii} Characters in Strings
You can include a non-@sc{ascii} international character in a string
constant by writing it literally. There are two text representations
unibyte source, then the character is read as unibyte and that makes the
string unibyte.
- You can also represent a multibyte non-@sc{ASCII} character with its
+ You can also represent a multibyte non-@sc{ascii} character with its
character code: use a hex escape, @samp{\x@var{nnnnnnn}}, with as many
-digits as necessary. (Multibyte non-@sc{ASCII} character codes are all
+digits as necessary. (Multibyte non-@sc{ascii} character codes are all
greater than 256.) Any character which is not a valid hex digit
terminates this construct. If the next character in the string could be
interpreted as a hex digit, write @w{@samp{\ }} (backslash and space) to
@tex
@math{2^{7}}
@end tex
-@ifinfo
+@ifnottex
2**7
-@end ifinfo
+@end ifnottex
bit of the character in the string. If the string is used in
@code{define-key} or @code{lookup-key}, this numeric code is translated
into the equivalent meta character. @xref{Character Type}.
@item keymapp
@xref{Creating Keymaps, keymapp}.
+@item keywordp
+@xref{Constant Variables}.
+
@item listp
@xref{List-related Predicates, listp}.
HCoop / bpt / emacs.git / blobdiff