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1 ;;; cc-guess.el --- guess indentation values by scanning existing code
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2
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3 ;; Copyright (C) 1994-1995 Free Software Foundation, Inc.
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4
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5 ;; Author: 1994-1995 Barry A. Warsaw
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6 ;; Maintainer: cc-mode-help@merlin.cnri.reston.va.us
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7 ;; Created: August 1994, split from cc-mode.el
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8 ;; Version: 1.7
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9 ;; Last Modified: 1995/08/28 20:39:43
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10 ;; Keywords: c languages oop
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11
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12 ;; This file is not part of GNU Emacs.
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13
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14 ;; This program is free software; you can redistribute it and/or modify
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15 ;; it under the terms of the GNU General Public License as published by
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16 ;; the Free Software Foundation; either version 2 of the License, or
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17 ;; (at your option) any later version.
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18 ;;
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19 ;; This program is distributed in the hope that it will be useful,
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20 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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21 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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22 ;; GNU General Public License for more details.
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23 ;;
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24 ;; You should have received a copy of the GNU General Public License
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25 ;; along with this program; if not, write to the Free Software
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26 ;; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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27
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28 ;;; Commentary:
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29 ;;
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30 ;; This file contains routines that help guess the cc-mode style in a
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31 ;; particular region of C, C++, or Objective-C code. It is provided
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32 ;; for example and experimentation only. It is not supported in
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33 ;; anyway. Some folks have asked for a style guesser and the best way
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34 ;; to show my thoughts on the subject is with this sample code. Feel
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35 ;; free to improve upon it in anyway you'd like. Please send me the
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36 ;; results. Note that style guessing is lossy!
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37 ;;
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38 ;; The way this is intended to be run is for you to mark a region of
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39 ;; code to guess the style of, then run the command, cc-guess-region.
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40
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41 ;;; Code:
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42
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43 (defvar cc-guessed-style nil
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44 "Currently guessed style.")
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45
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46 (defvar cc-guess-conversions
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47 '((c . c-lineup-C-comments)
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48 (inher-cont . c-lineup-multi-inher)
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49 (string . -1000)
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50 (comment-intro . c-lineup-comment)
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51 (arglist-cont-nonempty . c-lineup-arglist)
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52 (cpp-macro . -1000)))
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53
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54
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55 (defun cc-guess-region (start end &optional reset)
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56 "Sets `c-offset-alist' indentation values based on region of code.
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57 Every line of code in the region is examined and the indentation
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58 values of the various syntactic symbols in `c-offset-alist' is
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59 guessed. The first such positively identified indentation is used, so
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60 if an inconsistent style exists in the C code, the guessed indentation
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61 may be incorrect.
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62
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63 Note that the larger the region to guess in, the slower the
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64 guessing. Previous guesses can be concatenated together, unless the
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65 optional RESET is provided.
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66
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67 See `cc-guess-write-style' to find out how to save the guessed style,
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68 and `cc-guess-view-style' for viewing the guessed style."
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69 (interactive "r\nP")
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70 (if (consp reset)
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71 (setq cc-guessed-style nil))
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72 (save-excursion
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73 (goto-char start)
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74 (while (< (point) end)
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75 (let* ((syntax (c-guess-basic-syntax))
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76 (relpos (cdr (car syntax)))
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77 (symbol (car (car syntax)))
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78 point-indent relpos-indent)
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79 ;; TBD: for now I can't guess indentation when more than 1
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80 ;; symbol is on the list, nor for symbols without relpos's
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81 (if (or (/= 1 (length syntax))
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82 (not (numberp relpos))
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83 ;; also, don't try to reguess an already guessed
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84 ;; symbol
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85 (assq symbol cc-guessed-style))
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86 nil
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87 (back-to-indentation)
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88 (setq point-indent (current-column)
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89 relpos-indent (save-excursion
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90 (goto-char relpos)
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91 (current-column)))
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92 ;; guessed indentation is the difference between point's and
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93 ;; relpos's current-column indentation
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94 (setq cc-guessed-style
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95 (cons (cons symbol (- point-indent relpos-indent))
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96 cc-guessed-style))
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97 ))
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98 (forward-line 1))))
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99
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100 ;;; cc-guess.el ends here
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