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   1 ;;; awk-mode.el --- AWK code editing commands for Emacs
   2
   3 ;; Copyright (C) 1988, 1994, 1996, 2000, 2001, 2002, 2003, 2004,
   4 ;;   2005, 2006, 2007, 2008 Free Software Foundation, Inc.
   5
   6 ;; Maintainer: FSF
   7 ;; Keywords: unix, languages
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software; you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation; either version 3, or (at your option)
  14 ;; any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  23 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  24 ;; Boston, MA 02110-1301, USA.
  25
  26 ;;; Commentary:
  27
  28 ;; This file has been obsolete since Emacs 22.1.
  29
  30 ;; Sets up C-mode with support for awk-style #-comments and a lightly
  31 ;; hacked syntax table.
  32
  33 ;;; Code:
  34
  35 (defvar awk-mode-syntax-table
  36   (let ((st (make-syntax-table)))
  37   (modify-syntax-entry ?\\ "\\" st)
  38   (modify-syntax-entry ?\n ">   " st)
  39   (modify-syntax-entry ?\f ">   " st)
  40   (modify-syntax-entry ?\# "<   " st)
  41   ;; / can delimit regexes or be a division operator.  We assume that it is
  42   ;; more commonly used for regexes and fix the remaining cases with
  43   ;; `font-lock-syntactic-keywords'.
  44   (modify-syntax-entry ?/ "\"" st)
  45   (modify-syntax-entry ?* "." st)
  46   (modify-syntax-entry ?+ "." st)
  47   (modify-syntax-entry ?- "." st)
  48   (modify-syntax-entry ?= "." st)
  49   (modify-syntax-entry ?% "." st)
  50   (modify-syntax-entry ?< "." st)
  51   (modify-syntax-entry ?> "." st)
  52   (modify-syntax-entry ?& "." st)
  53   (modify-syntax-entry ?| "." st)
  54   (modify-syntax-entry ?_ "_" st)
  55   (modify-syntax-entry ?\' "\"" st)
  56   st)
  57   "Syntax table in use in `awk-mode' buffers.")
  58
  59 ;; Regexps written with help from Peter Galbraith <galbraith@mixing.qc.dfo.ca>.
  60 (defconst awk-font-lock-keywords
  61   (eval-when-compile
  62     (list
  63      ;;
  64      ;; Function names.
  65      '("^[ \t]*\\(function\\)\\>[ \t]*\\(\\sw+\\)?"
  66        (1 font-lock-keyword-face) (2 font-lock-function-name-face nil t))
  67      ;;
  68      ;; Variable names.
  69      (cons (regexp-opt
  70             '("ARGC" "ARGIND" "ARGV" "CONVFMT" "ENVIRON" "ERRNO"
  71               "FIELDWIDTHS" "FILENAME" "FNR" "FS" "IGNORECASE" "NF" "NR"
  72               "OFMT" "OFS" "ORS" "RLENGTH" "RS" "RSTART" "SUBSEP") 'words)
  73            'font-lock-variable-name-face)
  74      ;;
  75      ;; Keywords.
  76      (regexp-opt
  77       '("BEGIN" "END" "break" "continue" "delete" "do" "exit" "else" "for"
  78         "getline" "if" "next" "print" "printf" "return" "while") 'words)
  79      ;;
  80      ;; Builtins.
  81      (list (regexp-opt
  82             '("atan2" "close" "cos" "ctime" "exp" "gsub" "index" "int"
  83               "length" "log" "match" "rand" "sin" "split" "sprintf"
  84               "sqrt" "srand" "sub" "substr" "system" "time"
  85               "tolower" "toupper") 'words)
  86            1 'font-lock-builtin-face)
  87      ;;
  88      ;; Operators.  Is this too much?
  89      (cons (regexp-opt '("&&" "||" "<=" "<" ">=" ">" "==" "!=" "!~" "~"))
  90            'font-lock-constant-face)
  91      ))
  92  "Default expressions to highlight in AWK mode.")
  93
  94 (require 'syntax)
  95
  96 (defconst awk-font-lock-syntactic-keywords
  97   ;; `/' is mostly used for /.../ regular expressions, but is also
  98   ;; used as a division operator.  Distinguishing between the two is
  99   ;; a pain in the youknowwhat.
 100   ;; '(("\\(^\\|[<=>-+*%/!^,~(?:|&]\\)\\s-*\\(/\\)\\([^/\n\\]\\|\\\\.\\)*\\(/\\)"
 101   ;;    (2 "\"") (4 "\"")))
 102   '(("[^<=>-+*%/!^,~(?:|& \t\n\f]\\s-*\\(/\\)"
 103      (1 (unless (nth 3 (syntax-ppss (match-beginning 1))) "."))))
 104   "Syntactic keywords for `awk-mode'.")
 105
 106 ;; No longer autoloaded since it might clobber the autoload directive in CC Mode.
 107 (define-derived-mode awk-mode c-mode "AWK"
 108   "Major mode for editing AWK code.
 109 This is much like C mode except for the syntax of comments.  Its keymap
 110 inherits from C mode's and it has the same variables for customizing
 111 indentation.  It has its own abbrev table and its own syntax table.
 112
 113 Turning on AWK mode runs `awk-mode-hook'."
 114   (set (make-local-variable 'paragraph-start) (concat "$\\|" page-delimiter))
 115   (set (make-local-variable 'paragraph-separate) paragraph-start)
 116   (set (make-local-variable 'comment-start) "# ")
 117   (set (make-local-variable 'comment-end) "")
 118   (set (make-local-variable 'comment-start-skip) "#+ *")
 119   (setq font-lock-defaults '(awk-font-lock-keywords
 120                              nil nil ((?_ . "w")) nil
 121                              (parse-sexp-lookup-properties . t)
 122                              (font-lock-syntactic-keywords
 123                               . awk-font-lock-syntactic-keywords))))
 124
 125 (provide 'awk-mode)
 126
 127 ;; arch-tag: 14ebc02a-b3c5-4e76-8034-6ca9ac0af0e6
 128 ;;; awk-mode.el ends here