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(Case Tables): Document with-case-table and ascii-case-table.

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Chong Yidong 2007-04-04 15:57:04 +00:00
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lispref/strings.texi
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@ -1108,6 +1108,29 @@ This function returns the current buffer's case table.
This sets the current buffer's case table to @var{table}.
@end defun
@defmac with-case-table table body@dots{}
The @code{with-case-table} macro saves the current case table, makes
@var{table} the current case table, evaluates the @var{body} forms,
and finally restores the case table. The return value is the value of
the last form in @var{body}. The case table is restored even in case
of an abnormal exit via @code{throw} or error (@pxref{Nonlocal
Exits}).
@end defmac
Some language environments may modify the case conversions of ASCII
characters; for example, in the Turkish language environment, the
ASCII character ``I'' is downcased into a Turkish ``dotless i''. This
can interfere with code that requires ordinary ASCII case conversion,
such as implementations of ASCII-based network protocols. In that
case, use the @code{with-case-table} macro with the variable
@var{ascii-case-table}, which stores the unmodified case table for the
ASCII character set.
@defvar ascii-case-table
The case table for the ASCII character set. This should not be
modified by any language environment settings.
@end defvar
The following three functions are convenient subroutines for packages
that define non-@acronym{ASCII} character sets. They modify the specified
case table @var{case-table}; they also modify the standard syntax table.