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1133 lines
50 KiB
EmacsLisp
1133 lines
50 KiB
EmacsLisp
;;; cc-awk.el --- AWK specific code within cc-mode.
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;; Copyright (C) 1988, 1994, 1996, 2000-2014 Free Software Foundation,
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;; Inc.
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;; Author: Alan Mackenzie <acm@muc.de> (originally based on awk-mode.el)
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;; Maintainer: emacs-devel@gnu.org
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;; Keywords: AWK, cc-mode, unix, languages
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;; Package: cc-mode
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;; This file contains (most of) the adaptations to cc-mode required for the
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;; integration of AWK Mode.
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;; It is organized thusly, the sections being separated by page breaks:
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;; 1. The AWK Mode syntax table.
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;; 2. Regular expressions for analyzing AWK code.
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;; 3. Indentation calculation stuff ("c-awk-NL-prop text-property").
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;; 4. Syntax-table property/font-locking stuff, including the
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;; font-lock-keywords setting.
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;; 5. The AWK Mode before/after-change-functions.
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;; 6. AWK Mode specific versions of commands like beginning-of-defun.
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;; The AWK Mode keymap, abbreviation table, and the mode function itself are
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;; in cc-mode.el.
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;;; Code:
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(require 'cc-defs)
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(require 'cc-engine)
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(defvar awk-mode-syntax-table
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(let ((st (make-syntax-table)))
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(modify-syntax-entry ?\\ "\\" st)
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(modify-syntax-entry ?\n "> " st)
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(modify-syntax-entry ?\r "> " st)
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(modify-syntax-entry ?\f "> " st)
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(modify-syntax-entry ?\# "< " st)
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;; / can delimit regexes or be a division operator. By default we assume
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;; that it is a division sign, and fix the regexp operator cases with
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;; `font-lock-syntactic-keywords'.
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(modify-syntax-entry ?/ "." st) ; ACM 2002/4/27.
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(modify-syntax-entry ?* "." st)
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(modify-syntax-entry ?+ "." st)
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(modify-syntax-entry ?- "." st)
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(modify-syntax-entry ?= "." st)
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(modify-syntax-entry ?% "." st)
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(modify-syntax-entry ?< "." st)
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(modify-syntax-entry ?> "." st)
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(modify-syntax-entry ?& "." st)
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(modify-syntax-entry ?| "." st)
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(modify-syntax-entry ?_ "_" st)
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(modify-syntax-entry ?\' "." st)
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st)
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"Syntax table in use in AWK Mode buffers.")
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;; This section defines regular expressions used in the analysis of AWK code.
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;; N.B. In the following regexps, an EOL is either \n OR \r. This is because
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;; Emacs has in the past used \r to mark hidden lines in some fashion (and
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;; maybe still does).
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(defconst c-awk-esc-pair-re "\\\\\\(.\\|\n\\|\r\\|\\'\\)"
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"Matches any escaped (with \) character-pair, including an escaped newline.")
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(defconst c-awk-non-eol-esc-pair-re "\\\\\\(.\\|\\'\\)"
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"Matches any escaped (with \) character-pair, apart from an escaped newline.")
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(defconst c-awk-comment-without-nl "#.*"
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"Matches an AWK comment, not including the terminating NL (if any).
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Note that the \"enclosing\" (elisp) regexp must ensure the # is real.")
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(defconst c-awk-nl-or-eob "\\(\n\\|\r\\|\\'\\)"
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"Matches a newline, or the end of buffer.")
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;; "Space" regular expressions.
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(eval-and-compile
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(defconst c-awk-escaped-nl "\\\\[\n\r]"
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"Matches an escaped newline."))
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(eval-and-compile
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(defconst c-awk-escaped-nls* (concat "\\(" c-awk-escaped-nl "\\)*")
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"Matches a possibly empty sequence of escaped newlines.
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Used in `awk-font-lock-keywords'."))
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;; (defconst c-awk-escaped-nls*-with-space*
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;; (concat "\\(" c-awk-escaped-nls* "\\|" "[ \t]+" "\\)*"))
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;; The above RE was very slow. It's runtime was doubling with each additional
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;; space :-( Reformulate it as below:
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(eval-and-compile
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(defconst c-awk-escaped-nls*-with-space*
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(concat "\\(" c-awk-escaped-nl "\\|" "[ \t]" "\\)*")
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"Matches a possibly empty sequence of escaped newlines with optional
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interspersed spaces and tabs. Used in `awk-font-lock-keywords'."))
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(defconst c-awk-blank-or-comment-line-re
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(concat "[ \t]*\\(#\\|\\\\?$\\)")
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"Match (the tail of) a line containing at most either a comment or an
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escaped EOL.")
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;; REGEXPS FOR "HARMLESS" STRINGS/LINES.
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(defconst c-awk-harmless-_ "_\\([^\"]\\|\\'\\)"
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"Matches an underline NOT followed by \".")
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(defconst c-awk-harmless-char-re "[^_#/\"{}();\\\\\n\r]"
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"Matches any character not significant in the state machine applying
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syntax-table properties to \"s and /s.")
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(defconst c-awk-harmless-string*-re
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(concat "\\(" c-awk-harmless-char-re "\\|" c-awk-esc-pair-re "\\|" c-awk-harmless-_ "\\)*")
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"Matches a (possibly empty) sequence of characters insignificant in the
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state machine applying syntax-table properties to \"s and /s.")
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(defconst c-awk-harmless-string*-here-re
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(concat "\\=" c-awk-harmless-string*-re)
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"Matches the (possibly empty) sequence of \"insignificant\" chars at point.")
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(defconst c-awk-harmless-line-char-re "[^_#/\"\\\\\n\r]"
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"Matches any character but a _, #, /, \", \\, or newline. N.B. _\" starts a
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localization string in gawk 3.1.")
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(defconst c-awk-harmless-line-string*-re
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(concat "\\(" c-awk-harmless-line-char-re "\\|" c-awk-esc-pair-re "\\|" c-awk-harmless-_ "\\)*")
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"Matches a (possibly empty) sequence of chars without unescaped /, \", \\,
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#, or newlines.")
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(defconst c-awk-harmless-line-re
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(concat c-awk-harmless-line-string*-re
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"\\(" c-awk-comment-without-nl "\\)?" c-awk-nl-or-eob)
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"Matches (the tail of) an AWK \"logical\" line not containing an unescaped
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\" or /. \"logical\" means \"possibly containing escaped newlines\". A comment
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is matched as part of the line even if it contains a \" or a /. The End of
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buffer is also an end of line.")
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(defconst c-awk-harmless-lines+-here-re
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(concat "\\=\\(" c-awk-harmless-line-re "\\)+")
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"Matches a sequence of (at least one) \"harmless-line\" at point.")
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;; REGEXPS FOR AWK STRINGS.
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(defconst c-awk-string-ch-re "[^\"\\\n\r]"
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"Matches any character which can appear unescaped in a string.")
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(defconst c-awk-string-innards-re
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(concat "\\(" c-awk-string-ch-re "\\|" c-awk-esc-pair-re "\\)*")
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"Matches the inside of an AWK string (i.e. without the enclosing quotes).")
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(defconst c-awk-string-without-end-here-re
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(concat "\\=_?\"" c-awk-string-innards-re)
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"Matches an AWK string at point up to, but not including, any terminator.
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A gawk 3.1+ string may look like _\"localizable string\".")
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(defconst c-awk-possibly-open-string-re
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(concat "\"\\(" c-awk-string-ch-re "\\|" c-awk-esc-pair-re "\\)*"
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"\\(\"\\|$\\|\\'\\)"))
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;; REGEXPS FOR AWK REGEXPS.
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(defconst c-awk-regexp-normal-re "[^[/\\\n\r]"
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"Matches any AWK regexp character which doesn't require special analysis.")
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(defconst c-awk-escaped-newlines*-re "\\(\\\\[\n\r]\\)*"
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"Matches a (possibly empty) sequence of escaped newlines.")
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;; NOTE: In what follows, "[asdf]" in a regexp will be called a "character
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;; list", and "[:alpha:]" inside a character list will be known as a
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;; "character class". These terms for these things vary between regexp
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;; descriptions .
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(defconst c-awk-regexp-char-class-re
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"\\[:[a-z]+:\\]"
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"Matches a character class spec (e.g. [:alpha:]).")
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(defconst c-awk-regexp-char-list-re
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(concat "\\[" c-awk-escaped-newlines*-re "^?" c-awk-escaped-newlines*-re "]?"
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"\\(" c-awk-esc-pair-re "\\|" c-awk-regexp-char-class-re
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"\\|" "[^]\n\r]" "\\)*" "\\(]\\|$\\)")
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"Matches a regexp char list, up to (but not including) EOL if the ] is
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missing.")
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(defconst c-awk-regexp-innards-re
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(concat "\\(" c-awk-esc-pair-re "\\|" c-awk-regexp-char-list-re
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"\\|" c-awk-regexp-normal-re "\\)*")
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"Matches the inside of an AWK regexp (i.e. without the enclosing /s)")
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(defconst c-awk-regexp-without-end-re
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(concat "/" c-awk-regexp-innards-re)
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"Matches an AWK regexp up to, but not including, any terminating /.")
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;; REGEXPS used for scanning an AWK buffer in order to decide IF A '/' IS A
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;; REGEXP OPENER OR A DIVISION SIGN. By "state" in the following is meant
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;; whether a '/' at the current position would by a regexp opener or a
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;; division sign.
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(defconst c-awk-neutral-re
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; "\\([{}@` \t]\\|\\+\\+\\|--\\|\\\\.\\)+") ; changed, 2003/6/7
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"\\([}@` \t]\\|\\+\\+\\|--\\|\\\\\\(.\\|[\n\r]\\)\\)"
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"A \"neutral\" char(pair). Doesn't change the \"state\" of a subsequent /.
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This is space/tab, close brace, an auto-increment/decrement operator or an
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escaped character. Or one of the (invalid) characters @ or `. But NOT an
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end of line (unless escaped).")
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(defconst c-awk-neutrals*-re
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(concat "\\(" c-awk-neutral-re "\\)*")
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"A (possibly empty) string of neutral characters (or character pairs).")
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(defconst c-awk-var-num-ket-re "[]\)0-9a-zA-Z_$.\x80-\xff]+"
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"Matches a char which is a constituent of a variable or number, or a ket
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\(i.e. closing bracKET), round or square. Assume that all characters \\x80 to
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\\xff are \"letters\".")
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(defconst c-awk-div-sign-re
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(concat c-awk-var-num-ket-re c-awk-neutrals*-re "/")
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"Will match a piece of AWK buffer ending in / which is a division sign, in
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a context where an immediate / would be a regexp bracket. It follows a
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variable or number (with optional intervening \"neutral\" characters). This
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will only work when there won't be a preceding \" or / before the sought /
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to foul things up.")
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(defconst c-awk-non-arith-op-bra-re
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"[[\({&=:!><,?;'~|]"
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"Matches an opening BRAcket (of any sort), or any operator character
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apart from +,-,/,*,%. For the purpose at hand (detecting a / which is a
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regexp bracket) these arith ops are unnecessary and a pain, because of \"++\"
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and \"--\".")
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(defconst c-awk-regexp-sign-re
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(concat c-awk-non-arith-op-bra-re c-awk-neutrals*-re "/")
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"Will match a piece of AWK buffer ending in / which is an opening regexp
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bracket, in a context where an immediate / would be a division sign. This
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will only work when there won't be a preceding \" or / before the sought /
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to foul things up.")
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(defconst c-awk-pre-exp-alphanum-kwd-re
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(concat "\\(^\\|\\=\\|[^_\n\r]\\)\\<"
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(regexp-opt '("print" "return" "case") t)
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"\\>\\([^_\n\r]\\|$\\)")
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"Matches all AWK keywords which can precede expressions (including
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/regexp/).")
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(defconst c-awk-kwd-regexp-sign-re
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(concat c-awk-pre-exp-alphanum-kwd-re c-awk-escaped-nls*-with-space* "/")
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"Matches a piece of AWK buffer ending in <kwd> /, where <kwd> is a keyword
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which can precede an expression.")
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;; REGEXPS USED FOR FINDING THE POSITION OF A "virtual semicolon"
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(defconst c-awk-_-harmless-nonws-char-re "[^#/\"\\\\\n\r \t]")
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(defconst c-awk-non-/-syn-ws*-re
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(concat
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"\\(" c-awk-escaped-nls*-with-space*
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"\\(" c-awk-_-harmless-nonws-char-re "\\|"
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c-awk-non-eol-esc-pair-re "\\|"
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c-awk-possibly-open-string-re
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"\\)"
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"\\)*"))
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(defconst c-awk-space*-/-re (concat c-awk-escaped-nls*-with-space* "/")
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"Matches optional whitespace followed by \"/\".")
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(defconst c-awk-space*-regexp-/-re
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(concat c-awk-escaped-nls*-with-space* "\\s\"")
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"Matches optional whitespace followed by a \"/\" with string syntax (a matched
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regexp delimiter).")
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(defconst c-awk-space*-unclosed-regexp-/-re
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(concat c-awk-escaped-nls*-with-space* "\\s\|")
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"Matches optional whitespace followed by a \"/\" with string fence syntax (an
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unmatched regexp delimiter).")
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;; ACM, 2002/5/29:
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;;
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;; The next section of code is about determining whether or not an AWK
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;; statement is complete or not. We use this to indent the following line.
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;; The determination is pretty straightforward in C, where a statement ends
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;; with either a ; or a }. Only "while" really gives any trouble there, since
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;; it might be the end of a do-while. In AWK, on the other hand, semicolons
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;; are rarely used, and EOLs _usually_ act as "virtual semicolons". In
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;; addition, we have the complexity of escaped EOLs. The core of this
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;; analysis is in the middle of the function
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;; c-awk-calculate-NL-prop-prev-line, about 130 lines lower down.
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;;
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;; To avoid continually repeating this expensive analysis, we "cache" its
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;; result in a text-property, c-awk-NL-prop, whose value for a line is set on
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;; the EOL (if any) which terminates that line. Should the property be
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;; required for the very last line (which has no EOL), it is calculated as
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;; required but not cached. The c-awk-NL-prop property should be thought of
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;; as only really valid immediately after a buffer change, not a permanently
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;; set property. (By contrast, the syntax-table text properties (set by an
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;; after-change function) must be constantly updated for the mode to work
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;; properly).
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;;
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;; This text property is also used for "syntactic whitespace" movement, this
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;; being where the distinction between the values '$' and '}' is significant.
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;;
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;; The valid values for c-awk-NL-prop are:
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;;
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;; nil The property is not currently set for this line.
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;; '#' There is NO statement on this line (at most a comment), and no open
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;; statement from a previous line which could have been completed on this
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;; line.
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;; '{' There is an unfinished statement on this (or a previous) line which
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;; doesn't require \s to continue onto another line, e.g. the line ends
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;; with {, or the && operator, or "if (condition)". Note that even if the
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;; newline is redundantly escaped, it remains a '{' line.
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;; '\' There is an escaped newline at the end of this line and this '\' is
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;; essential to the syntax of the program. (i.e. if it had been a
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;; frivolous \, it would have been ignored and the line been given one of
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;; the other property values.)
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;; '$' A non-empty statement is terminated on the line by an EOL (a "virtual
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;; semicolon"). This might be a content-free line terminating a statement
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;; from the preceding (continued) line (which has property \).
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;; '}' A statement, being the last thing (aside from ws/comments) is
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;; explicitly terminated on this line by a closing brace (or sometimes a
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;; semicolon).
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;;
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;; This set of values has been chosen so that the property's value on a line
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;; is completely determined by the contents of the line and the property on
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;; the previous line, EXCEPT for where a "while" might be the closing
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;; statement of a do-while.
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(defun c-awk-after-if-for-while-condition-p (&optional do-lim)
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"Are we just after the ) in \"if/for/while (<condition>)\"?
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Note that the end of the ) in a do .... while (<condition>) doesn't
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count, since the purpose of this routine is essentially to decide
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whether to indent the next line.
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DO-LIM sets a limit on how far back we search for the \"do\" of a possible
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do-while.
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This function might do hidden buffer changes."
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(and
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(eq (char-before) ?\))
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(save-excursion
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(let ((par-pos (c-safe (scan-lists (point) -1 0))))
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(when par-pos
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(goto-char par-pos) ; back over "(...)"
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(c-backward-token-1) ; BOB isn't a problem.
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(or (looking-at "\\(if\\|for\\)\\>\\([^_]\\|$\\)")
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(and (looking-at "while\\>\\([^_]\\|$\\)") ; Ensure this isn't a do-while.
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(not (eq (c-beginning-of-statement-1 do-lim)
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'beginning)))))))))
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(defun c-awk-after-function-decl-param-list ()
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"Are we just after the ) in \"function foo (bar)\" ?
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This function might do hidden buffer changes."
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(and (eq (char-before) ?\))
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(save-excursion
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(let ((par-pos (c-safe (scan-lists (point) -1 0))))
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(when par-pos
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(goto-char par-pos) ; back over "(...)"
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(c-backward-token-1) ; BOB isn't a problem
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(and (looking-at "[_a-zA-Z][_a-zA-Z0-9]*\\>")
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(progn (c-backward-token-1)
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(looking-at "func\\(tion\\)?\\>"))))))))
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;; 2002/11/8: FIXME! Check c-backward-token-1/2 for success (0 return code).
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(defun c-awk-after-continue-token ()
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"Are we just after a token which can be continued onto the next line without
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a backslash?
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This function might do hidden buffer changes."
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(save-excursion
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(c-backward-token-1) ; FIXME 2002/10/27. What if this fails?
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(if (and (looking-at "[&|]") (not (bobp)))
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(backward-char)) ; c-backward-token-1 doesn't do this :-(
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(looking-at "[,{?:]\\|&&\\|||\\|do\\>\\|else\\>")))
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(defun c-awk-after-rbrace-or-statement-semicolon ()
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"Are we just after a } or a ; which closes a statement?
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Be careful about ;s in for loop control bits. They don't count!
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This function might do hidden buffer changes."
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(or (eq (char-before) ?\})
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(and
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(eq (char-before) ?\;)
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(save-excursion
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(let ((par-pos (c-safe (scan-lists (point) -1 1))))
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(when par-pos
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(goto-char par-pos) ; go back to containing (
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(not (and (looking-at "(")
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(c-backward-token-1) ; BOB isn't a problem
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(looking-at "for\\>")))))))))
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(defun c-awk-back-to-contentful-text-or-NL-prop ()
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"Move back to just after the first found of either (i) an EOL which has
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the `c-awk-NL-prop' text-property set; or (ii) non-ws text; or (iii) BOB.
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We return either the value of `c-awk-NL-prop' (in case (i)) or nil.
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Calling functions can best distinguish cases (ii) and (iii) with `bolp'.
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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.
|
||
|
||
This function might do hidden buffer changes."
|
||
(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.
|
||
;; If we find such, set the c-awk-NL-prop on it, too
|
||
;; (2004/3/29).
|
||
(c-backward-syntactic-ws bol-pos)
|
||
(or (/= (point) bsws-pos)
|
||
(progn (setq nl-prop ?\$)
|
||
(c-put-char-property (1- (point)) 'c-awk-NL-prop 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.
|
||
|
||
This function might do hidden buffer changes."
|
||
(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)))
|
||
?\\)
|
||
;; A statement was completed on this line. How?
|
||
((memq (char-before) '(?\; ?\})) ?\}) ; Real ; or }
|
||
(t ?\$))) ; A virtual semicolon.
|
||
(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 ?\$)))
|
||
;; ?\# (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 if we're already at BOB.
|
||
See `c-awk-after-if-for-while-condition-p' for a description of DO-LIM.
|
||
|
||
This function might do hidden buffer changes."
|
||
(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.
|
||
|
||
This function might do hidden buffer changes."
|
||
(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-char -1))))))
|
||
|
||
(defsubst 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.
|
||
|
||
This function might do hidden buffer changes."
|
||
(memq (c-awk-get-NL-prop-prev-line do-lim) '(?\\ ?\{)))
|
||
|
||
(defsubst 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.
|
||
|
||
This function might do hidden buffer changes."
|
||
(memq (c-awk-get-NL-prop-cur-line do-lim) '(?\\ ?\{)))
|
||
|
||
;; NOTES ON "VIRTUAL SEMICOLONS"
|
||
;;
|
||
;; A "virtual semicolon" is what terminates a statement when there is no ;
|
||
;; or } to do the job. Like point, it is considered to lie _between_ two
|
||
;; characters. As from mid-March 2004, it is considered to lie just after
|
||
;; the last non-syntactic-whitespace character on the line; (previously, it
|
||
;; was considered an attribute of the EOL on the line). A real semicolon
|
||
;; never counts as a virtual one.
|
||
|
||
(defun c-awk-at-vsemi-p (&optional pos)
|
||
"Is there a virtual semicolon at POS (or POINT)?"
|
||
(save-excursion
|
||
(let* (nl-prop
|
||
(pos-or-point (progn (if pos (goto-char pos)) (point)))
|
||
(bol (c-point 'bol)) (eol (c-point 'eol)))
|
||
(c-awk-beginning-of-logical-line)
|
||
;; Next `while' goes round one logical line (ending in, e.g. "\\") per
|
||
;; iteration. Such a line is rare, and can only be an open string
|
||
;; ending in an escaped \.
|
||
(while
|
||
(progn
|
||
;; Next `while' goes over a division sign or /regexp/ per iteration.
|
||
(while
|
||
(and
|
||
(< (point) eol)
|
||
(progn
|
||
(search-forward-regexp c-awk-non-/-syn-ws*-re eol)
|
||
(looking-at c-awk-space*-/-re)))
|
||
(cond
|
||
((looking-at c-awk-space*-regexp-/-re) ; /regexp/
|
||
(forward-sexp))
|
||
((looking-at c-awk-space*-unclosed-regexp-/-re) ; Unclosed /regexp
|
||
(condition-case nil
|
||
(progn
|
||
(forward-sexp)
|
||
(backward-char)) ; Move to end of (logical) line.
|
||
(error (end-of-line)))) ; Happens at EOB.
|
||
(t ; division sign
|
||
(c-forward-syntactic-ws)
|
||
(forward-char))))
|
||
(< (point) bol))
|
||
(forward-line))
|
||
(and (eq (point) pos-or-point)
|
||
(progn
|
||
(while (and (eq (setq nl-prop (c-awk-get-NL-prop-cur-line)) ?\\)
|
||
(eq (forward-line) 0)
|
||
(looking-at c-awk-blank-or-comment-line-re)))
|
||
(eq nl-prop ?\$))))))
|
||
|
||
(defun c-awk-vsemi-status-unknown-p ()
|
||
"Are we unsure whether there is a virtual semicolon on the current line?
|
||
DO NOT under any circumstances attempt to calculate this; that would
|
||
defeat the (admittedly kludgy) purpose of this function, which is to
|
||
prevent an infinite recursion in `c-beginning-of-statement-1' when point
|
||
starts at a `while' token."
|
||
(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.
|
||
|
||
This function might do hidden buffer changes."
|
||
(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.
|
||
|
||
This function might do hidden buffer changes."
|
||
(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-beyond-logical-line (&optional pos)
|
||
"Return the position just beyond the (apparent) current logical line, or the
|
||
one containing POS. This is usually the beginning of the next line which
|
||
doesn't follow an escaped EOL. At EOB, this will be EOB.
|
||
|
||
Point is unchanged.
|
||
|
||
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."
|
||
(save-excursion
|
||
(if pos (goto-char pos))
|
||
(end-of-line)
|
||
(while (and (< (point) (point-max))
|
||
(eq (char-before) ?\\))
|
||
(end-of-line 2))
|
||
(if (< (point) (point-max))
|
||
(1+ (point))
|
||
(point))))
|
||
|
||
;; 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.
|
||
|
||
This function does hidden buffer changes."
|
||
(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
|
||
(c-put-char-property beg 'syntax-table '(15))) ; (15) = "string fence"
|
||
((/= (char-after beg) (char-after end)) ; missing end delimiter
|
||
(c-put-char-property beg 'syntax-table '(15))
|
||
(c-put-char-property end 'syntax-table '(15)))
|
||
((eq (char-after beg) ?/) ; Properly bracketed regexp
|
||
(c-put-char-property beg 'syntax-table '(7)) ; (7) = "string"
|
||
(c-put-char-property 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)
|
||
(c-put-char-property (1- (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.
|
||
|
||
This function does hidden buffer changes."
|
||
(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 analyze 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.
|
||
|
||
This function does hidden buffer changes."
|
||
(let ((/point (point)))
|
||
(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))
|
||
(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.
|
||
(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.
|
||
|
||
This function does hidden buffer changes."
|
||
(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.
|
||
(c-clear-char-properties (point) lim 'syntax-table)
|
||
;; Once round the next loop for each string, regexp, or div sign
|
||
(while (progn
|
||
;; Skip any "harmless" lines before the next tricky one.
|
||
(if (search-forward-regexp c-awk-harmless-lines+-here-re nil t)
|
||
(setq anchor-state-/div nil))
|
||
(< (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 / or a brace/paren/semicolon.
|
||
;; Do our thing on the string, regexp or division sign or update
|
||
;; our state.
|
||
(setq 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
|
||
;; 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-ByLL 0)
|
||
(make-variable-buffer-local 'c-awk-old-Byll)
|
||
;; Just beyond logical line following the region which is about to be changed.
|
||
;; Set in c-awk-record-region-clear-NL and used in c-awk-after-change.
|
||
|
||
(defun c-awk-record-region-clear-NL (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. BEG is
|
||
ignored.
|
||
|
||
On entry, the buffer will have been widened and match-data will have been
|
||
saved; point is undefined on both entry and exit; the return value is
|
||
ignored.
|
||
|
||
This function does hidden buffer changes."
|
||
(c-save-buffer-state ()
|
||
(setq c-awk-old-ByLL (c-awk-beyond-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, whichever is later.
|
||
N.B. point is left undefined."
|
||
(max (+ (- c-awk-old-ByLL old-len) (- end beg))
|
||
(c-awk-beyond-logical-line 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.
|
||
|
||
(defvar c-new-BEG)
|
||
(defvar c-new-END)
|
||
|
||
;; ACM 2008-02-05:
|
||
(defun c-awk-extend-and-syntax-tablify-region (beg end old-len)
|
||
"Expand the region (BEG END) as needed to (c-new-BEG c-new-END) then put
|
||
`syntax-table' properties on this region.
|
||
|
||
This function is called from an after-change function, BEG END and
|
||
OLD-LEN being the standard parameters.
|
||
|
||
Point is undefined both before and after this function call, the buffer
|
||
has been widened, and match-data saved. The return value is ignored.
|
||
|
||
It prepares the buffer for font
|
||
locking, hence must get called before `font-lock-after-change-function'.
|
||
|
||
This function is the AWK value of `c-before-font-lock-function'.
|
||
It does hidden buffer changes."
|
||
(c-save-buffer-state ()
|
||
(setq c-new-END (c-awk-end-of-change-region beg end old-len))
|
||
(setq c-new-BEG (c-awk-beginning-of-logical-line beg))
|
||
(goto-char c-new-BEG)
|
||
(c-awk-set-syntax-table-properties c-new-END)))
|
||
|
||
;; Awk regexps written with help from Peter Galbraith
|
||
;; <galbraith@mixing.qc.dfo.ca>.
|
||
;; Take GNU Emacs's 'words out of the following regexp-opts. They don't work
|
||
;; in XEmacs 21.4.4. acm 2002/9/19.
|
||
(defconst awk-font-lock-keywords
|
||
(eval-when-compile
|
||
(list
|
||
;; Function names.
|
||
'("^\\s *\\(func\\(tion\\)?\\)\\>\\s *\\(\\sw+\\)?"
|
||
(1 font-lock-keyword-face) (3 font-lock-function-name-face nil t))
|
||
;;
|
||
;; Variable names.
|
||
(cons
|
||
(concat "\\<"
|
||
(regexp-opt
|
||
'("ARGC" "ARGIND" "ARGV" "BINMODE" "CONVFMT" "ENVIRON"
|
||
"ERRNO" "FIELDWIDTHS" "FILENAME" "FNR" "FS" "IGNORECASE"
|
||
"LINT" "NF" "NR" "OFMT" "OFS" "ORS" "PROCINFO" "RLENGTH"
|
||
"RS" "RSTART" "RT" "SUBSEP" "TEXTDOMAIN") t) "\\>")
|
||
'font-lock-variable-name-face)
|
||
|
||
;; Special file names. (acm, 2002/7/22)
|
||
;; The following regexp was created by first evaluating this in GNU Emacs 21.1:
|
||
;; (regexp-opt '("/dev/stdin" "/dev/stdout" "/dev/stderr" "/dev/fd/n" "/dev/pid"
|
||
;; "/dev/ppid" "/dev/pgrpid" "/dev/user") 'words)
|
||
;; , removing the "?:" from each "\\(?:" (for backward compatibility with older Emacsen)
|
||
;; , replacing the "n" in "dev/fd/n" with "[0-9]+"
|
||
;; , removing the unwanted \\< at the beginning, and finally filling out the
|
||
;; regexp so that a " must come before, and either a " or heuristic stuff after.
|
||
;; The surrounding quotes are fontified along with the filename, since, semantically,
|
||
;; they are an indivisible unit.
|
||
'("\\(\"/dev/\\(fd/[0-9]+\\|p\\(\\(\\(gr\\)?p\\)?id\\)\\|\
|
||
std\\(err\\|in\\|out\\)\\|user\\)\\)\\>\
|
||
\\(\\(\"\\)\\|\\([^\"/\n\r][^\"\n\r]*\\)?$\\)"
|
||
(1 font-lock-variable-name-face t)
|
||
(8 font-lock-variable-name-face t t))
|
||
;; Do the same (almost) with
|
||
;; (regexp-opt '("/inet/tcp/lport/rhost/rport" "/inet/udp/lport/rhost/rport"
|
||
;; "/inet/raw/lport/rhost/rport") 'words)
|
||
;; This cannot be combined with the above pattern, because the match number
|
||
;; for the (optional) closing \" would then exceed 9.
|
||
'("\\(\"/inet/\\(\\(raw\\|\\(tc\\|ud\\)p\\)/lport/rhost/rport\\)\\)\\>\
|
||
\\(\\(\"\\)\\|\\([^\"/\n\r][^\"\n\r]*\\)?$\\)"
|
||
(1 font-lock-variable-name-face t)
|
||
(6 font-lock-variable-name-face t t))
|
||
|
||
;; Keywords.
|
||
(concat "\\<"
|
||
(regexp-opt
|
||
'("BEGIN" "END" "break" "case" "continue" "default" "delete"
|
||
"do" "else" "exit" "for" "getline" "if" "in" "next"
|
||
"nextfile" "return" "switch" "while")
|
||
t) "\\>")
|
||
|
||
;; Builtins.
|
||
`(eval . (list
|
||
,(concat
|
||
"\\<"
|
||
(regexp-opt
|
||
'("adump" "and" "asort" "atan2" "bindtextdomain" "close"
|
||
"compl" "cos" "dcgettext" "exp" "extension" "fflush"
|
||
"gensub" "gsub" "index" "int" "length" "log" "lshift"
|
||
"match" "mktime" "or" "print" "printf" "rand" "rshift"
|
||
"sin" "split" "sprintf" "sqrt" "srand" "stopme"
|
||
"strftime" "strtonum" "sub" "substr" "system"
|
||
"systime" "tolower" "toupper" "xor")
|
||
t)
|
||
"\\>")
|
||
0 c-preprocessor-face-name))
|
||
|
||
;; gawk debugging keywords. (acm, 2002/7/21)
|
||
;; (Removed, 2003/6/6. These functions are now fontified as built-ins)
|
||
;; (list (concat "\\<" (regexp-opt '("adump" "stopme") t) "\\>")
|
||
;; 0 'font-lock-warning-face)
|
||
|
||
;; User defined functions with an apparent spurious space before the
|
||
;; opening parenthesis. acm, 2002/5/30.
|
||
`(,(concat "\\(\\w\\|_\\)" c-awk-escaped-nls* "\\s "
|
||
c-awk-escaped-nls*-with-space* "(")
|
||
(0 'font-lock-warning-face))
|
||
|
||
;; Space after \ in what looks like an escaped newline. 2002/5/31
|
||
'("\\\\\\s +$" 0 font-lock-warning-face t)
|
||
|
||
;; Unbalanced string (") or regexp (/) delimiters. 2002/02/16.
|
||
'("\\s|" 0 font-lock-warning-face t nil)
|
||
;; gawk 3.1 localizable strings ( _"translate me!"). 2002/5/21
|
||
'("\\(_\\)\\s|" 1 font-lock-warning-face)
|
||
'("\\(_\\)\\s\"" 1 font-lock-string-face) ; FIXME! not for XEmacs. 2002/10/6
|
||
))
|
||
"Default expressions to highlight in AWK mode.")
|
||
|
||
;; ACM 2002/9/29. Movement functions, e.g. for C-M-a and C-M-e
|
||
|
||
;; The following three regexps differ from those earlier on in cc-awk.el in
|
||
;; that they assume the syntax-table properties have been set. They are thus
|
||
;; not useful for code which sets these properties.
|
||
(defconst c-awk-terminated-regexp-or-string-here-re "\\=\\s\"\\S\"*\\s\""
|
||
"Matches a terminated string/regexp.")
|
||
|
||
(defconst c-awk-unterminated-regexp-or-string-here-re "\\=\\s|\\S|*$"
|
||
"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-at-statement-end-p ()
|
||
"Point is not inside a comment or string. Is it AT the end of a
|
||
statement? This means immediately after the last non-ws character of the
|
||
statement. The caller is responsible for widening the buffer, if
|
||
appropriate."
|
||
(and (not (bobp))
|
||
(save-excursion
|
||
(backward-char)
|
||
(or (looking-at "[};]")
|
||
(and (memq (c-awk-get-NL-prop-cur-line) '(?\$ ?\\))
|
||
(looking-at
|
||
(eval-when-compile
|
||
(concat "[^ \t\n\r\\]" c-awk-escaped-nls*-with-space*
|
||
"[#\n\r]"))))))))
|
||
|
||
(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 recognized 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.
|
||
|
||
Note that this function might do hidden buffer changes. See the
|
||
comment at the start of cc-engine.el for more info."
|
||
(interactive "p")
|
||
(or arg (setq arg 1))
|
||
(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.
|
||
|
||
This function might do hidden buffer changes."
|
||
(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.
|
||
|
||
This function might do hidden buffer changes."
|
||
(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.
|
||
|
||
This function might do hidden buffer changes."
|
||
(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'.
|
||
|
||
Note that this function might do hidden buffer changes. See the
|
||
comment at the start of cc-engine.el for more info."
|
||
(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)))))))
|
||
|
||
|
||
(provide 'cc-awk)
|
||
;;; cc-awk.el ends here
|