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1 ;;; fontl-hooks.el --- pre-loaded stuff for font-lock.
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2
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3 ;; Copyright (C) 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
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4 ;; Copyright (C) 1995 Amdahl Corporation.
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5 ;; Copyright (C) 1996 Ben Wing.
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6
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7 ;; This file is part of XEmacs.
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8
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9 ;; XEmacs is free software; you can redistribute it and/or modify it
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10 ;; under the terms of the GNU General Public License as published by
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11 ;; the Free Software Foundation; either version 2, or (at your option)
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12 ;; any later version.
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13
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14 ;; XEmacs is distributed in the hope that it will be useful, but
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15 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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17 ;; General Public License for more details.
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18
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19 ;; You should have received a copy of the GNU General Public License
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20 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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21 ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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22
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23 ;;; Synched up with: FSF 19.30. (font-lock.el)
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24
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25 ;;; Commentary:
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26
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27 ;; The reason for the existence of this file is so that modes can
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28 ;; call `font-lock-set-defaults' without worrying about whether
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29 ;; font-lock is loaded. We don't autoload this from font-lock.el
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30 ;; because loading font-lock.el automatically turns font-lock on.
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31
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32 ;;; Code:
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33
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34 (defun font-lock-set-defaults (&optional explicit-defaults)
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35 "Set fontification defaults appropriately for this mode.
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36 Sets `font-lock-keywords', `font-lock-keywords-only', `font-lock-syntax-table',
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37 `font-lock-beginning-of-syntax-function' and
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38 `font-lock-keywords-case-fold-search'.
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39
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40 If `font-lock-defaults' is currently set, it is used. Otherwise, the
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41 symbol naming the major mode is examined for a `font-lock-defaults'
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42 property. If that is not present, but a variable `foo-mode-font-lock-keywords'
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43 is, the value of that variable is used as the default for
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44 `font-lock-keywords'. Various other backward-compatible behaviors also
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45 exist -- if you're curious, look at the source.
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46
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47 The value of `font-lock-maximum-decoration' is used to determine which
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48 set of keywords applies, if more than one exists.
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49
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50 This will also put the buffer into Font Lock mode if any keywords exist
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51 and if auto-fontification is called for, as determined by
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52 `font-lock-auto-fontify', `font-lock-mode-enable-list', and
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53 `font-lock-mode-disable-list'.
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54
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55 Calling this function multiple times in the same buffer is safe -- this
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56 function keeps track of whether it has already been called in this
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57 buffer, and does nothing if so. This allows for multiple ways of getting
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58 Font Lock properly initialized in a buffer, to deal with existing major
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59 modes that do not call this function. (For example, Font Lock adds this
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60 function to `find-file-hooks'.)
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61
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62 Major modes that have any font-lock defaults specified should call this
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63 function during their initialization process, after they have set
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64 the variable `major-mode'.
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65
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66 If EXPLICIT-DEFAULTS is t, this function will not check whether it
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67 has already been run in this buffer, and will always do the full
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68 computation.
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69
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70 If EXPLICIT-DEFAULTS is not nil and not t, it should be something
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71 that is allowable as a value for `font-lock-defaults' and will be
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72 used to initialize the Font Lock variables."
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73
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74 (if (not (featurep 'font-lock))
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75 nil
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76 (if (or (and font-lock-auto-fontify
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77 (not (memq major-mode font-lock-mode-disable-list)))
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78 (and (not font-lock-auto-fontify)
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79 (memq major-mode font-lock-mode-enable-list)))
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80 (if (and (font-lock-set-defaults-1 explicit-defaults)
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81 font-lock-keywords)
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82 (turn-on-font-lock)))))
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83
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