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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)
;;; FIXME: change this to proof-
(defun 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 "\\)*"))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; font lock faces: declarations, errors, tacticals ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; FIXME 1: these names are bad, should be proof-<blah>-face.
;; FIXME 2: use defface here
(defun proof-have-color ()
"Do we have support for colour?"
(or (and (fboundp 'device-class)
(eq (device-class (frame-device)) 'color))
(and (fboundp 'x-display-color-p) (x-display-color-p))))
(defvar font-lock-declaration-name-face
(progn
(cond
((proof-have-color)
(copy-face 'bold 'font-lock-declaration-name-face)
;; Emacs 19.28 compiles this down to
;; internal-set-face-1. This is not compatible with XEmacs
(set-face-foreground
'font-lock-declaration-name-face "chocolate"))
(t (copy-face 'bold-italic 'font-lock-declaration-name-face)))))
;; (if running-emacs19
;; (setq font-lock-declaration-name-face
;; (face-name 'font-lock-declaration-name-face))
(defvar font-lock-tacticals-name-face
(if (proof-have-color)
(let ((face (make-face 'font-lock-tacticals-name-face)))
(dont-compile
(set-face-foreground face "MediumOrchid3"))
face)
(copy-face 'bold 'font-lock-tacticals-name-face)))
(defvar font-lock-error-face
(let ((face (make-face 'font-lock-error-face)))
(copy-face 'bold 'font-lock-error-face)
(and (proof-have-color) (set-face-background face "salmon1"))
face)
"*The face for error messages.")
(defvar font-lock-eager-annotation-face
(let ((face (make-face 'font-lock-eager-annotation-face)))
(if (proof-have-color)
(set-face-background face "lemon chiffon")
(copy-face 'italic face))
face)
"*The face for urgent messages.")
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; 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.
(defun proof-zap-commas-region (start end length)
(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)
'(font-lock-declaration-name-face
font-lock-function-name-face))
(font-lock-remove-face (- (point) 1) (point))
)))))
(defun proof-zap-commas-buffer ()
(proof-zap-commas-region (point-min) (point-max) 0))
(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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