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;; proof-syntax.el Generic font lock expressions
;; Copyright (C) 1997-1998 LFCS Edinburgh.
;; Author: Healfdene Goguen, Thomas Kleymann and Dilip Sequiera
;; Maintainer: Proof General maintainer <proofgen@dcs.ed.ac.uk>
;;
;; $Id$
;;
(require 'font-lock)
(require 'proof-config)
;; FIXME da: would regexp-opt be better here? Or maybe
;; (concat "\\<" (regexp-opt l) "\\>")
(defun proof-ids-to-regexp (l)
"transforms a non-empty list of identifiers `l' into a regular
expression matching any of its elements"
(mapconcat (lambda (s) (concat "\\<" s "\\>")) l "\\|"))
;; Generic font-lock
;; proof-commands-regexp is used for indentation
(defvar proof-commands-regexp ""
"Subset of keywords and tacticals which are terminated by the
`proof-terminal-char'")
(defvar proof-id "\\(\\w\\(\\w\\|\\s_\\)*\\)"
"A regular expression for parsing identifiers.")
;; For font-lock, we treat ,-separated identifiers as one identifier
;; and refontify commata using \{proof-unfontify-separator}.
(defun proof-ids (proof-id)
"Function to generate a regular expression for separated lists of
identifiers."
(concat proof-id "\\(\\s-*,\\s-*" proof-id "\\)*"))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; A big hack to unfontify commas in declarations and definitions. ;;
;; Useful for provers which have declarations of the form x,y,z:Ty ;;
;; All that can be said for it is that the previous way of doing ;;
;; this was even more bogus. ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Refontify the whole line, 'cos that's what font-lock-after-change
;; does.
;;FIXME: Under FSF Emacs 20.2, when initially fontifying the buffer,
;; commas are not zapped.
(defun proof-zap-commas-region (start end &optional length)
"Remove the face of all `,' within the region (START,END).
The optional argument LENGTH has no effect. It is required so that we
may assign this function to `after-change-function'."
(save-excursion
(let
((start (progn (goto-char start) (beginning-of-line) (point)))
(end (progn (goto-char end) (end-of-line) (point))))
(goto-char start)
(while (search-forward "," end t)
(if (memq (get-char-property (- (point) 1) 'face)
(list 'proof-declaration-name-face
'font-lock-function-name-face))
(font-lock-unfontify-region (- (point) 1) (point))
)))))
(defun proof-zap-commas-buffer ()
"Remove the face of all `,' in the current buffer."
(proof-zap-commas-region (point-min) (point-max)))
(defun proof-unfontify-separator ()
(make-local-variable 'after-change-functions)
(setq after-change-functions
(append (delq 'proof-zap-commas-region after-change-functions)
'(proof-zap-commas-region))))
(provide 'proof-syntax)
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