;;; cc-awk.el --- AWK specific code within cc-mode. ;; Copyright (C) 1988,94,96,2000,01,02,03 Free Software Foundation, Inc. ;; Author: Alan Mackenzie (originally based on awk-mode.el) ;; Maintainer: FSF ;; Keywords: AWK, cc-mode, unix, languages ;; This file is part of GNU Emacs. ;; GNU Emacs is free software; you can redistribute it and/or modify ;; it under the terms of the GNU General Public License as published by ;; the Free Software Foundation; either version 2, or (at your option) ;; any later version. ;; GNU Emacs is distributed in the hope that it will be useful, ;; but WITHOUT ANY WARRANTY; without even the implied warranty of ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ;; GNU General Public License for more details. ;; You should have received a copy of the GNU General Public License ;; along with GNU Emacs; see the file COPYING. If not, write to the ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, ;; Boston, MA 02111-1307, USA. ;;; Commentary: ;; This file contains (most of) the adaptations to cc-mode required for the ;; integration of AWK Mode. ;; It is organised thusly: ;; 1. The AWK Mode syntax table. ;; 2. Indentation calculation stuff ("c-awk-NL-prop text-property"). ;; 3. Syntax-table property/font-locking stuff, but not including the ;; font-lock-keywords setting. ;; 4. The AWK Mode before/after-change-functions. ;; 5. AWK Mode specific versions of commands like beginning-of-defun. ;; The AWK Mode keymap, abbreviation table, and the mode function itself are ;; in cc-mode.el. ;;; Code: (eval-when-compile (let ((load-path (if (and (boundp 'byte-compile-dest-file) (stringp byte-compile-dest-file)) (cons (file-name-directory byte-compile-dest-file) load-path) load-path))) (load "cc-bytecomp" nil t))) (cc-require 'cc-defs) ;; Silence the byte compiler. (cc-bytecomp-defvar font-lock-mode) ; Checked with boundp before use. ;; Some functions in cc-engine that are used below. There's a cyclic ;; dependency so it can't be required here. (Perhaps some functions ;; could be moved to cc-engine to avoid it.) (cc-bytecomp-defun c-backward-token-1) (cc-bytecomp-defun c-beginning-of-statement-1) (cc-bytecomp-defun c-backward-sws) (defvar awk-mode-syntax-table (let ((st (make-syntax-table))) (modify-syntax-entry ?\\ "\\" st) (modify-syntax-entry ?\n "> " st) (modify-syntax-entry ?\r "> " st) (modify-syntax-entry ?\f "> " st) (modify-syntax-entry ?\# "< " st) ;; / can delimit regexes or be a division operator. By default we assume ;; that it is a division sign, and fix the regexp operator cases with ;; `font-lock-syntactic-keywords'. (modify-syntax-entry ?/ "." st) ; ACM 2002/4/27. (modify-syntax-entry ?* "." st) (modify-syntax-entry ?+ "." st) (modify-syntax-entry ?- "." st) (modify-syntax-entry ?= "." st) (modify-syntax-entry ?% "." st) (modify-syntax-entry ?< "." st) (modify-syntax-entry ?> "." st) (modify-syntax-entry ?& "." st) (modify-syntax-entry ?| "." st) (modify-syntax-entry ?_ "_" st) (modify-syntax-entry ?\' "." st) st) "Syntax table in use in AWK Mode buffers.") ;; ACM, 2002/5/29: ;; ;; The next section of code is about determining whether or not an AWK ;; statement is complete or not. We use this to indent the following line. ;; The determination is pretty straightforward in C, where a statement ends ;; with either a ; or a }. Only "while" really gives any trouble there, since ;; it might be the end of a do-while. In AWK, on the other hand, semicolons ;; are rarely used, and EOLs _usually_ act as "virtual semicolons". In ;; addition, we have the complexity of escaped EOLs. The core of this ;; analysis is in the middle of the function ;; c-awk-calculate-NL-prop-prev-line, about 130 lines lower down. ;; ;; To avoid continually repeating this expensive analysis, we "cache" its ;; result in a text-property, c-awk-NL-prop, whose value for a line is set on ;; the EOL (if any) which terminates that line. Should the property be ;; required for the very last line (which has no EOL), it is calculated as ;; required but not cached. The c-awk-NL-prop property should be thought of ;; as only really valid immediately after a buffer change, not a permanently ;; set property. (By contrast, the syntax-table text properties (set by an ;; after-change function) must be constantly updated for the mode to work ;; properly). ;; ;; The valid values for c-awk-NL-prop are: ;; ;; nil The property is not currently set for this line. ;; '#' There is NO statement on this line (at most a comment), and no open ;; statement from a previous line which could have been completed on this ;; line. ;; '{' There is an unfinished statement on this (or a previous) line which ;; doesn't require \s to continue onto another line, e.g. the line ends ;; with {, or the && operator, or "if (condition)". Note that even if the ;; newline is redundantly escaped, it remains a '{' line. ;; '\' There is an escaped newline at the end of this line and this '\' is ;; essential to the syntax of the program. (i.e. if it had been a ;; frivolous \, it would have been ignored and the line been given one of ;; the other property values.) ;; ';' A statement is completed as the last thing (aside from ws) on the line - ;; i.e. there is (at least part of) a statement on this line, and the last ;; statement on the line is complete, OR (2002/10/25) the line is ;; content-free but terminates a statement from the preceding (continued) ;; line (which has property \). ;; ;; This set of values has been chosen so that the property's value on a line ;; is completely determined by the contents of the line and the property on ;; the previous line, EXCEPT for where a "while" might be the closing ;; statement of a do-while. (defun c-awk-after-if-for-while-condition-p (&optional do-lim) ;; Are we just after the ) in "if/for/while ()"? ;; ;; Note that the end of the ) in a do .... while () doesn't ;; count, since the purpose of this routine is essentially to decide ;; whether to indent the next line. ;; ;; DO-LIM sets a limit on how far back we search for the "do" of a possible ;; do-while. (and (eq (char-before) ?\)) (save-excursion (let ((par-pos (c-safe (scan-lists (point) -1 0)))) (when par-pos (goto-char par-pos) ; back over "(...)" (c-backward-token-1) ; BOB isn't a problem. (or (looking-at "\\(if\\|for\\)\\>\\([^_]\\|$\\)") (and (looking-at "while\\>\\([^_]\\|$\\)") ; Ensure this isn't a do-while. (not (eq (c-beginning-of-statement-1 do-lim) 'beginning))))))))) (defun c-awk-after-function-decl-param-list () ;; Are we just after the ) in "function foo (bar)" ? (and (eq (char-before) ?\)) (save-excursion (let ((par-pos (c-safe (scan-lists (point) -1 0)))) (when par-pos (goto-char par-pos) ; back over "(...)" (c-backward-token-1) ; BOB isn't a problem (and (looking-at "[_a-zA-Z][_a-zA-Z0-9]*\\>") (progn (c-backward-token-1) (looking-at "func\\(tion\\)?\\>")))))))) ;; 2002/11/8: FIXME! Check c-backward-token-1/2 for success (0 return code). (defun c-awk-after-continue-token () ;; Are we just after a token which can be continued onto the next line without ;; a backslash? (save-excursion (c-backward-token-1) ; FIXME 2002/10/27. What if this fails? (if (and (looking-at "[&|]") (not (bobp))) (backward-char)) ; c-backward-token-1 doesn't do this :-( (looking-at "[,{?:]\\|&&\\|||\\|do\\>\\|else\\>"))) (defun c-awk-after-rbrace-or-statement-semicolon () ;; Are we just after a } or a ; which closes a statement? ;; Be careful about ;s in for loop control bits. They don't count! (or (eq (char-before) ?\}) (and (eq (char-before) ?\;) (save-excursion (let ((par-pos (c-safe (scan-lists (point) -1 1)))) (when par-pos (goto-char par-pos) ; go back to containing ( (not (and (looking-at "(") (c-backward-token-1) ; BOB isn't a problem (looking-at "for\\>"))))))))) (defun c-awk-back-to-contentful-text-or-NL-prop () ;; Move back to just after the first found of either (i) an EOL which has ;; the c-awk-NL-prop text-property set; or (ii) non-ws text; or (iii) BOB. ;; We return either the value of c-awk-NL-prop (in case (i)) or nil. ;; Calling function can best distinguish cases (ii) and (iii) with (bolp). ;; ;; Note that an escaped eol counts as whitespace here. ;; ;; Kludge: If c-backward-syntactic-ws gets stuck at a BOL, it is likely ;; that the previous line contains an unterminated string (without \). In ;; this case, assume that the previous line's c-awk-NL-prop is a ;. ;; ;; POINT MUST BE AT THE START OF A LINE when calling this function. This ;; is to ensure that the various backward-comment functions will work ;; properly. (let ((nl-prop nil) bol-pos bsws-pos) ; starting pos for a backward-syntactic-ws call. (while ;; We are at a BOL here. Go back one line each iteration. (and (not (bobp)) (not (setq nl-prop (c-get-char-property (1- (point)) 'c-awk-NL-prop))) (progn (setq bol-pos (c-point 'bopl)) (setq bsws-pos (point)) ;; N.B. the following function will not go back past an EOL if ;; there is an open string (without \) on the previous line. (c-backward-syntactic-ws bol-pos) (or (/= (point) bsws-pos) (progn (setq nl-prop ?\;) nil))) ;; If we had a backslash at EOL, c-backward-syntactic-ws will ;; have gone backwards over it. Check the backslash was "real". (progn (if (looking-at "[ \t]*\\\\+$") (if (progn (end-of-line) (search-backward-regexp "\\(^\\|[^\\]\\)\\(\\\\\\\\\\)*\\\\$" ; ODD number of \s at EOL :-) bol-pos t)) (progn (end-of-line) ; escaped EOL. (backward-char) (c-backward-syntactic-ws bol-pos)) (end-of-line))) ; The \ at eol is a fake. (bolp)))) nl-prop)) (defun c-awk-calculate-NL-prop-prev-line (&optional do-lim) ;; Calculate and set the value of the c-awk-NL-prop on the immediately ;; preceding EOL. This may also involve doing the same for several ;; preceding EOLs. ;; ;; NOTE that if the property was already set, we return it without ;; recalculation. (This is by accident rather than design.) ;; ;; Return the property which got set (or was already set) on the previous ;; line. Return nil if we hit BOB. ;; ;; See c-awk-after-if-for-while-condition-p for a description of DO-LIM. (save-excursion (save-match-data (beginning-of-line) (let* ((pos (point)) (nl-prop (c-awk-back-to-contentful-text-or-NL-prop))) ;; We are either (1) at a BOL (with nl-prop containing the previous ;; line's c-awk-NL-prop) or (2) after contentful text on a line. At ;; the BOB counts as case (1), so we test next for bolp rather than ;; non-nil nl-prop. (when (not (bolp)) (setq nl-prop (cond ;; Incomplete statement which doesn't require escaped EOL? ((or (c-awk-after-if-for-while-condition-p do-lim) (c-awk-after-function-decl-param-list) (c-awk-after-continue-token)) ?\{) ;; Escaped EOL (where there's also something to continue)? ((and (looking-at "[ \t]*\\\\$") (not (c-awk-after-rbrace-or-statement-semicolon))) ?\\) (t ?\;))) ; A statement was completed on this line (end-of-line) (c-put-char-property (point) 'c-awk-NL-prop nl-prop) (forward-line)) ;; We are now at a (possibly empty) sequence of content-free lines. ;; Set c-awk-NL-prop on each of these lines's EOL. (while (< (point) pos) ; one content-free line each iteration. (cond ; recalculate nl-prop from previous line's value. ((memq nl-prop '(?\; nil)) (setq nl-prop ?\#)) ((eq nl-prop ?\\) (if (not (looking-at "[ \t]*\\\\$")) (setq nl-prop ?\;))) ; was ?\# 2002/10/25 ;; ?\# (empty line) and ?\{ (open stmt) don't change. ) (forward-line) (c-put-char-property (1- (point)) 'c-awk-NL-prop nl-prop)) nl-prop)))) (defun c-awk-get-NL-prop-prev-line (&optional do-lim) ;; Get the c-awk-NL-prop text-property from the previous line, calculating ;; it if necessary. Return nil iff we're already at BOB. ;; See c-awk-after-if-for-while-condition-p for a description of DO-LIM. (if (bobp) nil (or (c-get-char-property (c-point 'eopl) 'c-awk-NL-prop) (c-awk-calculate-NL-prop-prev-line do-lim)))) (defun c-awk-get-NL-prop-cur-line (&optional do-lim) ;; Get the c-awk-NL-prop text-property from the current line, calculating it ;; if necessary. (As a special case, the property doesn't get set on an ;; empty line at EOB (there's no position to set the property on), but the ;; function returns the property value an EOL would have got.) ;; ;; See c-awk-after-if-for-while-condition-p for a description of DO-LIM. (save-excursion (let ((extra-nl nil)) (end-of-line) ; Necessary for the following test to work. (when (= (forward-line) 1) ; if we were on the last line.... (insert-char ?\n 1) ; ...artificial eol is needed for comment detection. (setq extra-nl t)) (prog1 (c-awk-get-NL-prop-prev-line do-lim) (if extra-nl (delete-backward-char 1)))))) (defun c-awk-prev-line-incomplete-p (&optional do-lim) ;; Is there an incomplete statement at the end of the previous line? ;; See c-awk-after-if-for-while-condition-p for a description of DO-LIM. (memq (c-awk-get-NL-prop-prev-line do-lim) '(?\\ ?\{))) (defun c-awk-cur-line-incomplete-p (&optional do-lim) ;; Is there an incomplete statement at the end of the current line? ;; See c-awk-after-if-for-while-condition-p for a description of DO-LIM. (memq (c-awk-get-NL-prop-cur-line do-lim) '(?\\ ?\{))) (defun c-awk-completed-stmt-ws-ends-prev-line-p (&optional do-lim) ;; Is there a termination of a statement as the last thing (apart from an ;; optional comment) on the previous line? ;; See c-awk-after-if-for-while-condition-p for a description of DO-LIM. (eq (c-awk-get-NL-prop-prev-line do-lim) ?\;)) (defun c-awk-completed-stmt-ws-ends-line-p (&optional pos do-lim) ;; Same as previous function, but for the line containing position POS (or ;; the current line if POS is omitted). ;; See c-awk-after-if-for-while-condition-p for a description of DO-LIM. (save-excursion (if pos (goto-char pos)) (eq (c-awk-get-NL-prop-cur-line do-lim) ?\;))) (defun c-awk-after-logical-semicolon (&optional do-lim) ;; Are we at BOL, the preceding EOL being a "logical semicolon"? ;; See c-awk-after-if-for-while-condition-p for a description of DO-LIM. (and (bolp) (eq (c-awk-get-NL-prop-prev-line do-lim) ?\;))) (defun c-awk-backward-syntactic-ws (&optional lim) ;; Skip backwards over awk-syntactic whitespace. This is whitespace ;; characters, comments, and NEWLINES WHICH AREN'T "VIRTUAL SEMICOLONS". For ;; this function, a newline isn't a "virtual semicolon" if that line ends with ;; a real semicolon (or closing brace). ;; However if point starts inside a comment or preprocessor directive, the ;; content of it is not treated as whitespace. LIM (optional) sets a limit on ;; the backward movement. (let ((lim (or lim (point-min))) after-real-br) (c-backward-syntactic-ws (max lim (c-point 'bol))) (while ; go back one WS line each time round this loop. (and (bolp) (> (point) lim) (/= (c-awk-get-NL-prop-prev-line) ?\;) (/= (point) ;; The following function requires point at BONL [not EOL] to ;; recognise a preceding comment,. (progn (c-backward-syntactic-ws (max lim (c-point 'bopl))) (point))))) ;; Does the previous line end with a real ; or }? If so, go back to it. (if (and (bolp) (eq (c-awk-get-NL-prop-prev-line) ?\;) (save-excursion (c-backward-syntactic-ws (max lim (c-point 'bopl))) (setq after-real-br (point)) (c-awk-after-rbrace-or-statement-semicolon))) (goto-char after-real-br)))) (defun c-awk-NL-prop-not-set () ;; Is the NL-prop on the current line either nil or unset? (not (c-get-char-property (c-point 'eol) 'c-awk-NL-prop))) (defun c-awk-clear-NL-props (beg end) ;; This function is run from before-change-hooks. It clears the ;; c-awk-NL-prop text property from beg to the end of the buffer (The END ;; parameter is ignored). This ensures that the indentation engine will ;; never use stale values for this property. (save-restriction (widen) (c-clear-char-properties beg (point-max) 'c-awk-NL-prop))) (defun c-awk-unstick-NL-prop () ;; Ensure that the text property c-awk-NL-prop is "non-sticky". Without ;; this, a new newline inserted after an old newline (e.g. by C-j) would ;; inherit any c-awk-NL-prop from the old newline. This would be a Bad ;; Thing. This function's action is required by c-put-char-property. (if (and (boundp 'text-property-default-nonsticky) ; doesn't exist in Xemacs (not (assoc 'c-awk-NL-prop text-property-default-nonsticky))) (setq text-property-default-nonsticky (cons '(c-awk-NL-prop . t) text-property-default-nonsticky)))) ;; The following is purely a diagnostic command, to be commented out of the ;; final release. ACM, 2002/6/1 ;; (defun NL-props () ;; (interactive) ;; (let (pl-prop cl-prop) ;; (message "Prev-line: %s Cur-line: %s" ;; (if (setq pl-prop (c-get-char-property (c-point 'eopl) 'c-awk-NL-prop)) ;; (char-to-string pl-prop) ;; "nil") ;; (if (setq cl-prop (c-get-char-property (c-point 'eol) 'c-awk-NL-prop)) ;; (char-to-string cl-prop) ;; "nil")))) ;(define-key awk-mode-map [?\C-c ?\r] 'NL-props) ; commented out, 2002/8/31 ;for now. In the byte compiled version, this causes things to crash because ;awk-mode-map isn't yet defined. :-( ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;; The following section of the code is to do with font-locking. The biggest ;; problem for font-locking is deciding whether a / is a regular expression ;; delimiter or a division sign - determining precisely where strings and ;; regular expressions start and stop is also troublesome. This is the ;; purpose of the function c-awk-set-syntax-table-properties and the myriad ;; elisp regular expressions it uses. ;; ;; Because AWK is a line oriented language, I felt the normal cc-mode strategy ;; for font-locking unterminated strings (i.e. font-locking the buffer up to ;; the next string delimiter as a string) was inappropriate. Instead, ;; unbalanced string/regexp delimiters are given the warning font, being ;; refonted with the string font as soon as the matching delimiter is entered. ;; ;; This requires the region processed by the current font-lock after-change ;; function to have access to the start of the string/regexp, which may be ;; several lines back. The elisp "advice" feature is used on these functions ;; to allow this. (defun c-awk-beginning-of-logical-line (&optional pos) ;; Go back to the start of the (apparent) current line (or the start of the ;; line containing POS), returning the buffer position of that point. I.e., ;; go back to the last line which doesn't have an escaped EOL before it. ;; ;; This is guaranteed to be "safe" for syntactic analysis, i.e. outwith any ;; comment, string or regexp. IT MAY WELL BE that this function should not be ;; executed on a narrowed buffer. (if pos (goto-char pos)) (forward-line 0) (while (and (> (point) (point-min)) (eq (char-before (1- (point))) ?\\)) (forward-line -1)) (point)) (defun c-awk-end-of-logical-line (&optional pos) ;; Go forward to the end of the (apparent) current logical line (or the end of ;; the line containing POS), returning the buffer position of that point. I.e., ;; go to the end of the next line which doesn't have an escaped EOL. ;; ;; This is guaranteed to be "safe" for syntactic analysis, i.e. outwith any ;; comment, string or regexp. IT MAY WELL BE that this function should not be ;; executed on a narrowed buffer. (if pos (goto-char pos)) (end-of-line) (while (and (< (point) (point-max)) (eq (char-before) ?\\)) (end-of-line 2)) (point)) ;; N.B. In the following regexps, an EOL is either \n OR \r. This is because ;; Emacs has in the past used \r to mark hidden lines in some fashion (and ;; maybe still does). (defconst c-awk-esc-pair-re "\\\\\\(.\\|\n\\|\r\\|\\'\\)") ;; Matches any escaped (with \) character-pair, including an escaped newline. (defconst c-awk-comment-without-nl "#.*") ;; Matches an AWK comment, not including the terminating NL (if any). Note ;; that the "enclosing" (elisp) regexp must ensure the # is real. (defconst c-awk-nl-or-eob "\\(\n\\|\r\\|\\'\\)") ;; Matches a newline, or the end of buffer. ;; "Space" regular expressions. (defconst c-awk-escaped-nl "\\\\[\n\r]") ;; Matches an escaped newline. (defconst c-awk-escaped-nls* (concat "\\(" c-awk-escaped-nl "\\)*")) ;; Matches a possibly empty sequence of escaped newlines. Used in ;; awk-font-lock-keywords. ;; (defconst c-awk-escaped-nls*-with-space* ;; (concat "\\(" c-awk-escaped-nls* "\\|" "[ \t]+" "\\)*")) ;; The above RE was very slow. It's runtime was doubling with each additional ;; space :-( Reformulate it as below: (defconst c-awk-escaped-nls*-with-space* (concat "\\(" c-awk-escaped-nl "\\|" "[ \t]" "\\)*")) ;; Matches a possibly empty sequence of escaped newlines with optional ;; interspersed spaces and tabs. Used in awk-font-lock-keywords. ;; REGEXPS FOR "HARMLESS" STRINGS/LINES. (defconst c-awk-harmless-char-re "[^_#/\"\\\\\n\r]") ;; Matches any character but a _, #, /, ", \, or newline. N.B. _" starts a ;; localisation string in gawk 3.1 (defconst c-awk-harmless-_ "_\\([^\"]\\|\\'\\)") ;; Matches an underline NOT followed by ". (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. (defconst c-awk-harmless-string*-here-re (concat "\\=" c-awk-harmless-string*-re)) ;; Matches the (possibly empty) sequence of chars without unescaped /, ", \, ;; at point. (defconst c-awk-harmless-line-re (concat c-awk-harmless-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 ;; buffer is also an end of line. (defconst c-awk-harmless-lines+-here-re (concat "\\=\\(" c-awk-harmless-line-re "\\)+")) ;; Matches a sequence of (at least one) \"harmless-line\" at point. ;; REGEXPS FOR AWK STRINGS. (defconst c-awk-string-ch-re "[^\"\\\n\r]") ;; Matches any character which can appear unescaped in a string. (defconst c-awk-string-innards-re (concat "\\(" c-awk-string-ch-re "\\|" c-awk-esc-pair-re "\\)*")) ;; Matches the inside of an AWK string (i.e. without the enclosing quotes). (defconst c-awk-string-without-end-here-re (concat "\\=_?\"" c-awk-string-innards-re)) ;; Matches an AWK string at point up to, but not including, any terminator. ;; A gawk 3.1+ string may look like _"localisable string". ;; REGEXPS FOR AWK REGEXPS. (defconst c-awk-regexp-normal-re "[^[/\\\n\r]") ;; Matches any AWK regexp character which doesn't require special analysis. (defconst c-awk-escaped-newlines*-re "\\(\\\\[\n\r]\\)*") ;; Matches a (possibly empty) sequence of escaped newlines. (defconst c-awk-regexp-char-class-re (concat "\\[" c-awk-escaped-newlines*-re "^?" c-awk-escaped-newlines*-re "]?" "\\(" c-awk-esc-pair-re "\\|" "[^]\n\r]" "\\)*" "\\(]\\|$\\)")) ;; Matches a regexp char class, up to (but not including) EOL if the ] is ;; missing. (defconst c-awk-regexp-innards-re (concat "\\(" c-awk-esc-pair-re "\\|" c-awk-regexp-char-class-re "\\|" c-awk-regexp-normal-re "\\)*")) ;; Matches the inside of an AWK regexp (i.e. without the enclosing /s) (defconst c-awk-regexp-without-end-re (concat "/" c-awk-regexp-innards-re)) ;; Matches an AWK regexp up to, but not including, any terminating /. ;; REGEXPS used for scanning an AWK buffer in order to decide IF A '/' IS A ;; REGEXP OPENER OR A DIVISION SIGN. By "state" in the following is meant ;; whether a '/' at the current position would by a regexp opener or a ;; division sign. (defconst c-awk-neutral-re ; "\\([{}@` \t]\\|\\+\\+\\|--\\|\\\\.\\)+") ; changed, 2003/6/7 "\\([{}@` \t]\\|\\+\\+\\|--\\|\\\\.\\)") ;; A "neutral" char(pair). Doesn't change the "state" of a subsequent /. ;; This is space/tab, braces, an auto-increment/decrement operator or an ;; escaped character. Or one of the (illegal) characters @ or `. But NOT an ;; end of line (even if escpaed). (defconst c-awk-neutrals*-re (concat "\\(" c-awk-neutral-re "\\)*")) ;; A (possibly empty) string of neutral characters (or character pairs). (defconst c-awk-var-num-ket-re "[]\)0-9a-zA-Z_$.\x80-\xff]+") ;; Matches a char which is a constituent of a variable or number, or a ket ;; (i.e. closing bracKET), round or square. Assume that all characters \x80 to ;; \xff are "letters". (defconst c-awk-div-sign-re (concat c-awk-var-num-ket-re c-awk-neutrals*-re "/")) ;; Will match a piece of AWK buffer ending in / which is a division sign, in ;; a context where an immediate / would be a regexp bracket. It follows a ;; variable or number (with optional intervening "neutral" characters). This ;; 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 openeing BRAcket ,round or square, 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 "--". (defconst c-awk-regexp-sign-re (concat c-awk-non-arith-op-bra-re c-awk-neutrals*-re "/")) ;; Will match a piece of AWK buffer ending in / which is an opening regexp ;; 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. ;; ACM, 2002/02/15: The idea of the next function is to put the "Error font" ;; on strings/regexps which are missing their closing delimiter. ;; 2002/4/28. The default syntax for / has been changed from "string" to ;; "punctuation", to reduce hassle when this character appears within a string ;; or comment. (defun c-awk-set-string-regexp-syntax-table-properties (beg end) ;; BEG and END bracket a (possibly unterminated) string or regexp. The ;; opening delimiter is after BEG, and the closing delimiter, IF ANY, is AFTER ;; END. Set the appropriate syntax-table properties on the delimiters and ;; contents of this string/regex. ;; ;; "String" here can also mean a gawk 3.1 "localizable" string which starts ;; with _". In this case, we step over the _ and ignore it; It will get it's ;; font from an entry in awk-font-lock-keywords. ;; ;; If the closing delimiter is missing (i.e., there is an EOL there) set the ;; STRING-FENCE property on the opening " or / and closing EOL. (if (eq (char-after beg) ?_) (setq beg (1+ beg))) ;; First put the properties on the delimiters. (cond ((eq end (point-max)) ; string/regexp terminated by EOB (put-text-property beg (1+ beg) 'syntax-table '(15))) ; (15) = "string fence" ((/= (char-after beg) (char-after end)) ; missing end delimiter (put-text-property beg (1+ beg) 'syntax-table '(15)) (put-text-property end (1+ end) 'syntax-table '(15))) ((eq (char-after beg) ?/) ; Properly bracketed regexp (put-text-property beg (1+ beg) 'syntax-table '(7)) ; (7) = "string" (put-text-property end (1+ end) 'syntax-table '(7))) (t)) ; Properly bracketed string: Nothing to do. ;; Now change the properties of any escaped "s in the string to punctuation. (save-excursion (goto-char (1+ beg)) (or (eobp) (while (search-forward "\"" end t) (put-text-property (1- (point)) (point) 'syntax-table '(1)))))) (defun c-awk-syntax-tablify-string () ;; Point is at the opening " or _" of a string. Set the syntax-table ;; properties on this string, leaving point just after the string. ;; ;; The result is nil if a / immediately after the string would be a regexp ;; opener, t if it would be a division sign. (search-forward-regexp c-awk-string-without-end-here-re nil t) ; a (possibly unterminated) string (c-awk-set-string-regexp-syntax-table-properties (match-beginning 0) (match-end 0)) (cond ((looking-at "\"") (forward-char) t) ; In AWK, ("15" / 5) gives 3 ;-) ((looking-at "[\n\r]") ; Unterminated string with EOL. (forward-char) nil) ; / on next line would start a regexp (t nil))) ; Unterminated string at EOB (defun c-awk-syntax-tablify-/ (anchor anchor-state-/div) ;; Point is at a /. Determine whether this is a division sign or a regexp ;; opener, and if the latter, apply syntax-table properties to the entire ;; regexp. Point is left immediately after the division sign or regexp, as ;; the case may be. ;; ;; ANCHOR-STATE-/DIV identifies whether a / at ANCHOR would have been a ;; division sign (value t) or a regexp opener (value nil). The idea is that ;; we analyse the line from ANCHOR up till point to determine what the / at ;; point is. ;; ;; The result is what ANCHOR-STATE-/DIV (see above) is where point is left. (let ((/point (point))) (goto-char anchor) ;; Analyse 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. (progn (goto-char (1+ /point)) nil) ;; A regexp opener ;; Jump over the regexp innards, setting the match data. (goto-char /point) (search-forward-regexp c-awk-regexp-without-end-re) (c-awk-set-string-regexp-syntax-table-properties (match-beginning 0) (match-end 0)) (cond ((looking-at "/") ; Terminating / (forward-char) t) ((looking-at "[\n\r]") ; Incomplete regexp terminated by EOL (forward-char) nil) ; / on next line would start another regexp (t nil))))) ; Unterminated regexp at EOB (defun c-awk-set-syntax-table-properties (lim) ;; Scan the buffer text between point and LIM, setting (and clearing) the ;; syntax-table property where necessary. ;; ;; This function is designed to be called as the FUNCTION in a MATCHER in ;; font-lock-syntactic-keywords, and it always returns NIL (to inhibit ;; repeated calls from font-lock: See elisp info page "Search-based ;; Fontification"). It also gets called, with a bit of glue, from ;; after-change-functions when font-lock isn't active. Point is left ;; "undefined" after this function exits. THE BUFFER SHOULD HAVE BEEN ;; WIDENED, AND ANY PRECIOUS MATCH-DATA SAVED BEFORE CALLING THIS ROUTINE. ;; ;; We need to set/clear the syntax-table property on: ;; (i) / - It is set to "string" on a / which is the opening or closing ;; delimiter of the properly terminated regexp (and left unset on a ;; division sign). ;; (ii) the opener of an unterminated string/regexp, we set the property ;; "generic string delimiter" on both the opening " or / and the end of the ;; line where the closing delimiter is missing. ;; (iii) "s inside strings/regexps (these will all be escaped "s). They are ;; given the property "punctuation". This will later allow other routines ;; to use the regexp "\\S\"*" to skip over the string innards. ;; (iv) Inside a comment, all syntax-table properties are cleared. (let (anchor (anchor-state-/div nil)) ; t means a following / would be a div sign. (c-awk-beginning-of-logical-line) ; ACM 2002/7/21. This is probably redundant. (put-text-property (point) lim 'syntax-table nil) (search-forward-regexp c-awk-harmless-lines+-here-re nil t) ; skip harmless lines. ;; Once round the next loop for each string, regexp, or div sign (while (< (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 divsion sign. (setq anchor-state-/div (if (looking-at "_?\"") (c-awk-syntax-tablify-string) (c-awk-syntax-tablify-/ anchor anchor-state-/div))) ;; Skip any further "harmless" lines before the next tricky one. (if (search-forward-regexp c-awk-harmless-lines+-here-re nil t) (setq anchor-state-/div nil))) nil)) ;; ACM, 2002/07/21: Thoughts: We need an AWK Mode after-change function to set ;; the syntax-table properties even when font-lock isn't enabled, for the ;; subsequent use of movement functions, etc. However, it seems that if font ;; lock _is_ enabled, we can always leave it to do the job. (defvar c-awk-old-EOLL 0) (make-variable-buffer-local 'c-awk-old-EOLL) ;; End of logical line following the region which is about to be changed. Set ;; in c-awk-before-change and used in c-awk-after-change. (defun c-awk-before-change (beg end) ;; This function is called exclusively from the before-change-functions hook. ;; It does two things: Finds the end of the (logical) line on which END lies, ;; and clears c-awk-NL-prop text properties from this point onwards. (save-restriction (save-excursion (setq c-awk-old-EOLL (c-awk-end-of-logical-line end)) (c-save-buffer-state nil (c-awk-clear-NL-props end (point-max)))))) (defun c-awk-end-of-change-region (beg end old-len) ;; Find the end of the region which needs to be font-locked after a change. ;; This is the end of the logical line on which the change happened, either ;; as it was before the change, or as it is now, which ever is later. ;; N.B. point is left undefined. (max (+ (- c-awk-old-EOLL old-len) (- end beg)) (c-awk-end-of-logical-line end))) (defun c-awk-after-change (beg end old-len) ;; This function is called exclusively as an after-change function in ;; AWK Mode. It ensures that the syntax-table properties get set in the ;; changed region. However, if font-lock is enabled, this function does ;; nothing, since an enabled font-lock after-change function will always do ;; this. (unless (and (boundp 'font-lock-mode) font-lock-mode) (save-restriction (save-excursion (setq end (c-awk-end-of-change-region beg end old-len)) (c-awk-beginning-of-logical-line beg) (c-save-buffer-state nil ; So that read-only status isn't affected. ; (e.g. when first loading the buffer) (c-awk-set-syntax-table-properties end)))))) ;; ACM 2002/5/25. When font-locking is invoked by a buffer change, the region ;; specified by the font-lock after-change function must be expanded to ;; include ALL of any string or regexp within the region. The simplest way to ;; do this in practice is to use the beginning/end-of-logical-line functions. ;; Don't overlook the possibility of the buffer change being the "recapturing" ;; of a previously escaped newline. (defmacro c-awk-advise-fl-for-awk-region (function) `(defadvice ,function (before get-awk-region activate) ;; When font-locking an AWK Mode buffer, make sure that any string/regexp is ;; completely font-locked. (when (eq major-mode 'awk-mode) (save-excursion (ad-set-arg 1 (c-awk-end-of-change-region (ad-get-arg 0) ; beg (ad-get-arg 1) ; end (ad-get-arg 2))) ; old-len (ad-set-arg 0 (c-awk-beginning-of-logical-line (ad-get-arg 0))))))) (c-awk-advise-fl-for-awk-region font-lock-after-change-function) (c-awk-advise-fl-for-awk-region jit-lock-after-change) (c-awk-advise-fl-for-awk-region lazy-lock-defer-rest-after-change) (c-awk-advise-fl-for-awk-region lazy-lock-defer-line-after-change) ;; ACM 2002/9/29. Functions for C-M-a and C-M-e (defconst c-awk-terminated-regexp-or-string-here-re "\\=\\s\"\\S\"*\\s\"") ;; Matches a terminated string/regexp (utilising syntax-table properties). (defconst c-awk-unterminated-regexp-or-string-here-re "\\=\\s|\\S|*$") ;; Matches an unterminated string/regexp, NOT including the eol at the end. (defconst c-awk-harmless-pattern-characters* (concat "\\([^{;#/\"\\\\\n\r]\\|" c-awk-esc-pair-re "\\)*")) ;; Matches any "harmless" character in a pattern or an escaped character pair. (defun c-awk-beginning-of-defun (&optional arg) "Move backward to the beginning of an AWK \"defun\". With ARG, do it that many times. Negative arg -N means move forward to Nth following beginning of defun. Returns t unless search stops due to beginning or end of buffer. By a \"defun\" is meant either a pattern-action pair or a function. The start of a defun is recognised as code starting at column zero which is neither a closing brace nor a comment nor a continuation of the previous line. Unlike in some other modes, having an opening brace at column 0 is neither necessary nor helpful." (interactive "p") (save-match-data (c-save-buffer-state ; ensures the buffer is writable. nil (let ((found t)) ; Has the most recent regexp search found b-of-defun? (if (>= arg 0) ;; Go back one defun each time round the following loop. (For +ve arg) (while (and found (> arg 0) (not (eq (point) (point-min)))) ;; Go back one "candidate" each time round the next loop until one ;; is genuinely a beginning-of-defun. (while (and (setq found (search-backward-regexp "^[^#} \t\n\r]" (point-min) 'stop-at-limit)) (not (memq (c-awk-get-NL-prop-prev-line) '(?\; ?\#))))) (setq arg (1- arg))) ;; The same for a -ve arg. (if (not (eq (point) (point-max))) (forward-char 1)) (while (and found (< arg 0) (not (eq (point) (point-max)))) ; The same for -ve arg. (while (and (setq found (search-forward-regexp "^[^#} \t\n\r]" (point-max) 'stop-at-limit)) (not (memq (c-awk-get-NL-prop-prev-line) '(?\; ?\#))))) (setq arg (1+ arg))) (if found (goto-char (match-beginning 0)))) (eq arg 0))))) (defun c-awk-forward-awk-pattern () ;; Point is at the start of an AWK pattern (which may be null) or function ;; declaration. Move to the pattern's end, and past any trailing space or ;; comment. Typically, we stop at the { which denotes the corresponding AWK ;; action/function body. Otherwise we stop at the EOL (or ;) marking the ;; absence of an explicit action. (while (progn (search-forward-regexp c-awk-harmless-pattern-characters*) (if (looking-at "#") (end-of-line)) (cond ((eobp) nil) ((looking-at "[{;]") nil) ; We've finished! ((eolp) (if (c-awk-cur-line-incomplete-p) (forward-line) ; returns non-nil nil)) ((search-forward-regexp c-awk-terminated-regexp-or-string-here-re nil t)) ((search-forward-regexp c-awk-unterminated-regexp-or-string-here-re nil t)) ((looking-at "/") (forward-char) t))))) ; division sign. (defun c-awk-end-of-defun1 () ;; point is at the start of a "defun". Move to its end. Return end position. (c-awk-forward-awk-pattern) (cond ((looking-at "{") (goto-char (scan-sexps (point) 1))) ((looking-at ";") (forward-char)) ((eolp)) (t (error "c-awk-end-of-defun1: Failure of c-awk-forward-awk-pattern"))) (point)) (defun c-awk-beginning-of-defun-p () ;; Are we already at the beginning of a defun? (i.e. at code in column 0 ;; which isn't a }, and isn't a continuation line of any sort. (and (looking-at "^[^#} \t\n\r]") (not (c-awk-prev-line-incomplete-p)))) (defun c-awk-end-of-defun (&optional arg) "Move forward to next end of defun. With argument, do it that many times. Negative argument -N means move back to Nth preceding end of defun. An end of a defun occurs right after the closing brace that matches the opening brace at its start, or immediately after the AWK pattern when there is no explicit action; see function `c-awk-beginning-of-defun'." (interactive "p") (or arg (setq arg 1)) (save-match-data (c-save-buffer-state nil (let ((start-point (point)) end-point) ;; Strategy: (For +ve ARG): If we're not already at a beginning-of-defun, ;; move backwards to one. ;; Repeat [(i) move forward to end-of-current-defun (see below); ;; (ii) If this isn't it, move forward to beginning-of-defun]. ;; We start counting ARG only when step (i) has passed the original point. (when (> arg 0) ;; Try to move back to a beginning-of-defun, if not already at one. (if (not (c-awk-beginning-of-defun-p)) (when (not (c-awk-beginning-of-defun 1)) ; No bo-defun before point. (goto-char start-point) (c-awk-beginning-of-defun -1))) ; if this fails, we're at EOB, tough! ;; Now count forward, one defun at a time (while (and (not (eobp)) (c-awk-end-of-defun1) (if (> (point) start-point) (setq arg (1- arg)) t) (> arg 0) (c-awk-beginning-of-defun -1)))) (when (< arg 0) (setq end-point start-point) (while (and (not (bobp)) (c-awk-beginning-of-defun 1) (if (< (setq end-point (if (bobp) (point) (save-excursion (c-awk-end-of-defun1)))) start-point) (setq arg (1+ arg)) t) (< arg 0))) (goto-char (min start-point end-point))))))) (cc-provide 'cc-awk) ; Changed from 'awk-mode, ACM 2002/5/21 ;;; arch-tag: c4836289-3aa4-4a59-9934-9ccc2bacccf3 ;;; awk-mode.el ends here