(defvar set-case-syntax-offset 0)
(defvar set-case-syntax-set-multibyte nil)
(defun describe-buffer-case-table ()
"Describe the case table of the current buffer."
(interactive)
(let ((description (make-char-table 'case-table)))
(map-char-table
(function (lambda (key value)
(aset
description key
(cond ((not (natnump value))
"case-invariant")
((/= key (downcase key))
(concat "uppercase, matches "
(char-to-string (downcase key))))
((/= key (upcase key))
(concat "lowercase, matches "
(char-to-string (upcase key))))
(t "case-invariant")))))
(current-case-table))
(save-excursion
(with-output-to-temp-buffer "*Help*"
(set-buffer standard-output)
(describe-vector description)
(help-mode)))))
(defun get-upcase-table (case-table)
"Return the upcase table of CASE-TABLE."
(or (char-table-extra-slot case-table 0)
(let ((old (standard-case-table)))
(unwind-protect
(progn
(set-standard-case-table case-table)
(char-table-extra-slot case-table 0))
(or (eq case-table old)
(set-standard-case-table old))))))
(defun copy-case-table (case-table)
(let ((copy (copy-sequence case-table))
(up (char-table-extra-slot case-table 0)))
(if up
(set-char-table-extra-slot copy 0 (copy-sequence up)))
(set-char-table-extra-slot copy 1 nil)
(set-char-table-extra-slot copy 2 nil)
copy))
(defsubst set-case-syntax-1 (char)
"Offset CHAR by `set-case-syntax-offset' if CHAR is a non-ASCII 8-bit char."
(if (and (>= char 128) (< char 256))
(+ char set-case-syntax-offset)
char))
(defun set-case-syntax-delims (l r table)
"Make characters L and R a matching pair of non-case-converting delimiters.
This sets the entries for L and R in TABLE, which is a string
that will be used as the downcase part of a case table.
It also modifies `standard-syntax-table' to
indicate left and right delimiters."
(setq l (set-case-syntax-1 l))
(setq r (set-case-syntax-1 r))
(aset table l l)
(aset table r r)
(let ((up (get-upcase-table table)))
(aset up l l)
(aset up r r))
(set-char-table-extra-slot table 1 nil)
(set-char-table-extra-slot table 2 nil)
(modify-syntax-entry l (concat "(" (char-to-string r) " ")
(standard-syntax-table))
(modify-syntax-entry r (concat ")" (char-to-string l) " ")
(standard-syntax-table)))
(defun set-case-syntax-pair (uc lc table)
"Make characters UC and LC a pair of inter-case-converting letters.
This sets the entries for characters UC and LC in TABLE, which is a string
that will be used as the downcase part of a case table.
It also modifies `standard-syntax-table' to give them the syntax of
word constituents."
(setq uc (set-case-syntax-1 uc))
(setq lc (set-case-syntax-1 lc))
(aset table uc lc)
(aset table lc lc)
(let ((up (get-upcase-table table)))
(aset up uc uc)
(aset up lc uc))
(set-char-table-extra-slot table 1 nil)
(set-char-table-extra-slot table 2 nil)
(modify-syntax-entry lc "w " (standard-syntax-table))
(modify-syntax-entry uc "w " (standard-syntax-table)))
(defun set-upcase-syntax (uc lc table)
"Make character UC an upcase of character LC.
It also modifies `standard-syntax-table' to give them the syntax of
word constituents."
(setq uc (set-case-syntax-1 uc))
(setq lc (set-case-syntax-1 lc))
(aset table lc lc)
(let ((up (get-upcase-table table)))
(aset up uc uc)
(aset up lc uc))
(set-char-table-extra-slot table 1 nil)
(set-char-table-extra-slot table 2 nil)
(modify-syntax-entry lc "w " (standard-syntax-table))
(modify-syntax-entry uc "w " (standard-syntax-table)))
(defun set-downcase-syntax (uc lc table)
"Make character LC a downcase of character UC.
It also modifies `standard-syntax-table' to give them the syntax of
word constituents."
(setq uc (set-case-syntax-1 uc))
(setq lc (set-case-syntax-1 lc))
(aset table uc lc)
(aset table lc lc)
(let ((up (get-upcase-table table)))
(aset up uc uc))
(set-char-table-extra-slot table 1 nil)
(set-char-table-extra-slot table 2 nil)
(modify-syntax-entry lc "w " (standard-syntax-table))
(modify-syntax-entry uc "w " (standard-syntax-table)))
(defun set-case-syntax (c syntax table)
"Make character C case-invariant with syntax SYNTAX.
This sets the entry for character C in TABLE, which is a string
that will be used as the downcase part of a case table.
It also modifies `standard-syntax-table'.
SYNTAX should be \" \", \"w\", \".\" or \"_\"."
(setq c (set-case-syntax-1 c))
(aset table c c)
(let ((up (get-upcase-table table)))
(aset up c c))
(set-char-table-extra-slot table 1 nil)
(set-char-table-extra-slot table 2 nil)
(modify-syntax-entry c syntax (standard-syntax-table)))
(provide 'case-table)