;;; cc-awk.el --- AWK specific code within cc-mode.
-;; Copyright (C) 1988, 1994, 1996, 2000-2012 Free Software Foundation, Inc.
+;; Copyright (C) 1988, 1994, 1996, 2000-2013 Free Software Foundation,
+;; Inc.
;; Author: Alan Mackenzie <acm@muc.de> (originally based on awk-mode.el)
;; Maintainer: FSF
;; escaped EOL.
;; REGEXPS FOR "HARMLESS" STRINGS/LINES.
-(defconst c-awk-harmless-char-re "[^_#/\"\\\\\n\r]")
-;; Matches any character but a _, #, /, ", \, or newline. N.B. _" starts a
-;; localization string in gawk 3.1
(defconst c-awk-harmless-_ "_\\([^\"]\\|\\'\\)")
;; Matches an underline NOT followed by ".
+(defconst c-awk-harmless-char-re "[^_#/\"{}();\\\\\n\r]")
+;; Matches any character not significant in the state machine applying
+;; syntax-table properties to "s and /s.
(defconst c-awk-harmless-string*-re
(concat "\\(" c-awk-harmless-char-re "\\|" c-awk-esc-pair-re "\\|" c-awk-harmless-_ "\\)*"))
-;; Matches a (possibly empty) sequence of chars without unescaped /, ", \,
-;; #, or newlines.
+;; Matches a (possibly empty) sequence of characters insignificant in the
+;; state machine applying syntax-table properties to "s and /s.
(defconst c-awk-harmless-string*-here-re
(concat "\\=" c-awk-harmless-string*-re))
-;; Matches the (possibly empty) sequence of chars without unescaped /, ", \,
-;; at point.
+;; Matches the (possibly empty) sequence of "insignificant" chars at point.
+
+(defconst c-awk-harmless-line-char-re "[^_#/\"\\\\\n\r]")
+;; Matches any character but a _, #, /, ", \, or newline. N.B. _" starts a
+;; localization string in gawk 3.1
+(defconst c-awk-harmless-line-string*-re
+ (concat "\\(" c-awk-harmless-line-char-re "\\|" c-awk-esc-pair-re "\\|" c-awk-harmless-_ "\\)*"))
+;; Matches a (possibly empty) sequence of chars without unescaped /, ", \,
+;; #, or newlines.
(defconst c-awk-harmless-line-re
- (concat c-awk-harmless-string*-re
- "\\(" c-awk-comment-without-nl "\\)?" c-awk-nl-or-eob))
+ (concat c-awk-harmless-line-string*-re
+ "\\(" c-awk-comment-without-nl "\\)?" c-awk-nl-or-eob))
;; Matches (the tail of) an AWK \"logical\" line not containing an unescaped
;; " or /. "logical" means "possibly containing escaped newlines". A comment
;; is matched as part of the line even if it contains a " or a /. The End of
;; division sign.
(defconst c-awk-neutral-re
; "\\([{}@` \t]\\|\\+\\+\\|--\\|\\\\.\\)+") ; changed, 2003/6/7
- "\\([{}@` \t]\\|\\+\\+\\|--\\|\\\\.\\)")
+ "\\([}@` \t]\\|\\+\\+\\|--\\|\\\\\\(.\\|[\n\r]\\)\\)")
;; A "neutral" char(pair). Doesn't change the "state" of a subsequent /.
-;; This is space/tab, braces, an auto-increment/decrement operator or an
+;; This is space/tab, close brace, an auto-increment/decrement operator or an
;; escaped character. Or one of the (invalid) characters @ or `. But NOT an
-;; end of line (even if escaped).
+;; end of line (unless escaped).
(defconst c-awk-neutrals*-re
(concat "\\(" c-awk-neutral-re "\\)*"))
;; A (possibly empty) string of neutral characters (or character pairs).
;; will only work when there won't be a preceding " or / before the sought /
;; to foul things up.
(defconst c-awk-non-arith-op-bra-re
- "[[\(&=:!><,?;'~|]")
-;; Matches an opening BRAcket, round or square, or any operator character
+ "[[\({&=:!><,?;'~|]")
+;; Matches an opening BRAcket (of any sort), or any operator character
;; apart from +,-,/,*,%. For the purpose at hand (detecting a / which is a
;; regexp bracket) these arith ops are unnecessary and a pain, because of "++"
;; and "--".
;; bracket, in a context where an immediate / would be a division sign. This
;; will only work when there won't be a preceding " or / before the sought /
;; to foul things up.
+(defconst c-awk-pre-exp-alphanum-kwd-re
+ (concat "\\(^\\|\\=\\|[^_\n\r]\\)\\<"
+ (regexp-opt '("print" "return" "case") t)
+ "\\>\\([^_\n\r]\\|$\\)"))
+;; Matches all AWK keywords which can precede expressions (including
+;; /regexp/).
+(defconst c-awk-kwd-regexp-sign-re
+ (concat c-awk-pre-exp-alphanum-kwd-re c-awk-escaped-nls*-with-space* "/"))
+;; Matches a piece of AWK buffer ending in <kwd> /, where <kwd> is a keyword
+;; which can precede an expression.
;; REGEXPS USED FOR FINDING THE POSITION OF A "virtual semicolon"
(defconst c-awk-_-harmless-nonws-char-re "[^#/\"\\\\\n\r \t]")
(goto-char anchor)
;; Analyze the line to find out what the / is.
(if (if anchor-state-/div
- (not (search-forward-regexp c-awk-regexp-sign-re (1+ /point) t))
- (search-forward-regexp c-awk-div-sign-re (1+ /point) t))
- ;; A division sign.
+ (not (search-forward-regexp c-awk-regexp-sign-re (1+ /point) t))
+ (and (not (search-forward-regexp c-awk-kwd-regexp-sign-re (1+ /point) t))
+ (search-forward-regexp c-awk-div-sign-re (1+ /point) t)))
+ ;; A division sign.
(progn (goto-char (1+ /point)) nil)
;; A regexp opener
;; Jump over the regexp innards, setting the match data.
(< (point) lim))
(setq anchor (point))
(search-forward-regexp c-awk-harmless-string*-here-re nil t)
- ;; We are now looking at either a " or a /.
- ;; Do our thing on the string, regexp or division sign.
+ ;; We are now looking at either a " or a / or a brace/paren/semicolon.
+ ;; Do our thing on the string, regexp or division sign or update
+ ;; our state.
(setq anchor-state-/div
- (if (looking-at "_?\"")
- (c-awk-syntax-tablify-string)
- (c-awk-syntax-tablify-/ anchor anchor-state-/div))))
+ (cond
+ ((looking-at "_?\"")
+ (c-awk-syntax-tablify-string))
+ ((eq (char-after) ?/)
+ (c-awk-syntax-tablify-/ anchor anchor-state-/div))
+ ((memq (char-after) '(?{ ?} ?\( ?\;))
+ (forward-char)
+ nil)
+ (t ; ?\)
+ (forward-char)
+ t))))
nil))
;; ACM, 2002/07/21: Thoughts: We need an AWK Mode after-change function to set
HCoop / bpt / emacs.git / blobdiff