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209
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1 ;;; format.el --- read and save files in multiple formats
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2
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3 ;; Copyright (c) 1994, 1995, 1997 Free Software Foundation
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4
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5 ;; Author: Boris Goldowsky <boris@gnu.ai.mit.edu>
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6 ;; Keywords: extensions, dumped
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7
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8 ;; This file is part of XEmacs.
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9
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10 ;; XEmacs is free software; you can redistribute it and/or modify it
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11 ;; under the terms of the GNU General Public License as published by
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12 ;; the Free Software Foundation; either version 2, or (at your option)
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13 ;; any later version.
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14
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15 ;; XEmacs is distributed in the hope that it will be useful, but
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16 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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18 ;; General Public License for more details.
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19
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20 ;; You should have received a copy of the GNU General Public License
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21 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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22 ;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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23 ;; 02111-1307, USA.
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24
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215
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25 ;;; Synched up with: Emacs 20.2.
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209
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26
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27 ;;; Commentary:
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28
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29 ;; This file is dumped with XEmacs.
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30
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31 ;; This file defines a unified mechanism for saving & loading files stored
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32 ;; in different formats. `format-alist' contains information that directs
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33 ;; Emacs to call an encoding or decoding function when reading or writing
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34 ;; files that match certain conditions.
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35 ;;
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36 ;; When a file is visited, its format is determined by matching the
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37 ;; beginning of the file against regular expressions stored in
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38 ;; `format-alist'. If this fails, you can manually translate the buffer
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39 ;; using `format-decode-buffer'. In either case, the formats used are
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40 ;; listed in the variable `buffer-file-format', and become the default
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41 ;; format for saving the buffer. To save a buffer in a different format,
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42 ;; change this variable, or use `format-write-file'.
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43 ;;
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44 ;; Auto-save files are normally created in the same format as the visited
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45 ;; file, but the variable `auto-save-file-format' can be set to a
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46 ;; particularly fast or otherwise preferred format to be used for
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47 ;; auto-saving (or nil to do no encoding on auto-save files, but then you
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48 ;; risk losing any text-properties in the buffer).
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49 ;;
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50 ;; You can manually translate a buffer into or out of a particular format
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51 ;; with the functions `format-encode-buffer' and `format-decode-buffer'.
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52 ;; To translate just the region use the functions `format-encode-region'
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53 ;; and `format-decode-region'.
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54 ;;
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55 ;; You can define a new format by writing the encoding and decoding
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56 ;; functions, and adding an entry to `format-alist'. See enriched.el for
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57 ;; an example of how to implement a file format. There are various
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58 ;; functions defined in this file that may be useful for writing the
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59 ;; encoding and decoding functions:
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60 ;; * `format-annotate-region' and `format-deannotate-region' allow a
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61 ;; single alist of information to be used for encoding and decoding.
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62 ;; The alist defines a correspondence between strings in the file
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63 ;; ("annotations") and text-properties in the buffer.
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64 ;; * `format-replace-strings' is similarly useful for doing simple
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65 ;; string->string translations in a reversible manner.
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66
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67 ;;; Code:
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68
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69 (put 'buffer-file-format 'permanent-local t)
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70
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71 (defvar format-alist
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72 '((image/jpeg "JPEG image" "\377\330\377\340\000\020JFIF"
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73 image-decode-jpeg nil t image-mode)
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74 (image/gif "GIF image" "GIF8[79]"
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75 image-decode-gif nil t image-mode)
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76 (image/png "Portable Network Graphics" "\211PNG"
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77 image-decode-png nil t image-mode)
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78 (image/x-xpm "XPM image" "/\\* XPM \\*/"
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79 image-decode-xpm nil t image-mode)
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80 (text/enriched "Extended MIME text/enriched format."
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81 "Content-[Tt]ype:[ \t]*text/enriched"
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82 enriched-decode enriched-encode t enriched-mode)
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83 (text/richtext "Extended MIME obsolete text/richtext format."
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84 "Content-[Tt]ype:[ \t]*text/richtext"
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85 richtext-decode richtext-encode t enriched-mode)
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215
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86 (plain "ISO 8859-1 standard format, no text properties."
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209
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87 ;; Plain only exists so that there is an obvious neutral choice in
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88 ;; the completion list.
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215
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89 nil nil nil nil nil)
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90 ;; (ibm "IBM Code Page 850 (DOS)"
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91 ;; "1\\(^\\)"
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92 ;; "recode ibm-pc:latin1" "recode latin1:ibm-pc" t nil)
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93 ;; (mac "Apple Macintosh"
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94 ;; "1\\(^\\)"
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95 ;; "recode mac:latin1" "recode latin1:mac" t nil)
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96 ;; (hp "HP Roman8"
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97 ;; "1\\(^\\)"
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98 ;; "recode roman8:latin1" "recode latin1:roman8" t nil)
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99 ;; (TeX "TeX (encoding)"
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100 ;; "1\\(^\\)"
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101 ;; iso-tex2iso iso-iso2tex t nil)
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102 ;; (gtex "German TeX (encoding)"
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103 ;; "1\\(^\\)"
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104 ;; iso-gtex2iso iso-iso2gtex t nil)
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105 ;; (html "HTML (encoding)"
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106 ;; "1\\(^\\)"
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107 ;; "recode html:latin1" "recode latin1:html" t nil)
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108 ;; (rot13 "rot13"
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109 ;; "1\\(^\\)"
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110 ;; "tr a-mn-z n-za-m" "tr a-mn-z n-za-m" t nil)
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111 ;; (duden "Duden Ersatzdarstellung"
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112 ;; "1\\(^\\)"
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113 ;; "diac" iso-iso2duden t nil)
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114 ;; (de646 "German ASCII (ISO 646)"
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115 ;; "1\\(^\\)"
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116 ;; "recode iso646-ge:latin1" "recode latin1:iso646-ge" t nil)
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117 ;; (denet "net German"
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118 ;; "1\\(^\\)"
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119 ;; iso-german iso-cvt-read-only t nil)
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120 ;; (esnet "net Spanish"
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121 ;; "1\\(^\\)"
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122 ;; iso-spanish iso-cvt-read-only t nil)
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123 )
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209
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124 "List of information about understood file formats.
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125 Elements are of the form \(NAME DOC-STR REGEXP FROM-FN TO-FN MODIFY MODE-FN).
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215
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126
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209
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127 NAME is a symbol, which is stored in `buffer-file-format'.
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215
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128
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209
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129 DOC-STR should be a single line providing more information about the
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130 format. It is currently unused, but in the future will be shown to
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131 the user if they ask for more information.
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215
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132
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209
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133 REGEXP is a regular expression to match against the beginning of the file;
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134 it should match only files in that format.
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215
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135
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209
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136 FROM-FN is called to decode files in that format; it gets two args, BEGIN
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137 and END, and can make any modifications it likes, returning the new
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138 end. It must make sure that the beginning of the file no longer
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139 matches REGEXP, or else it will get called again.
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215
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140 Alternatively, FROM-FN can be a string, which specifies a shell command
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141 (including options) to be used as a filter to perform the conversion.
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142
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209
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143 TO-FN is called to encode a region into that format; it is passed three
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144 arguments: BEGIN, END, and BUFFER. BUFFER is the original buffer that
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145 the data being written came from, which the function could use, for
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146 example, to find the values of local variables. TO-FN should either
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147 return a list of annotations like `write-region-annotate-functions',
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148 or modify the region and return the new end.
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215
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149 Alternatively, TO-FN can be a string, which specifies a shell command
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150 (including options) to be used as a filter to perform the conversion.
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151
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209
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152 MODIFY, if non-nil, means the TO-FN wants to modify the region. If nil,
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153 TO-FN will not make any changes but will instead return a list of
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154 annotations.
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215
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155
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209
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156 MODE-FN, if specified, is called when visiting a file with that format.")
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157
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158 ;;; Basic Functions (called from Lisp)
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159
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215
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160 (defun format-encode-run-method (method from to &optional buffer)
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161 "Translate using function or shell script METHOD the text from FROM to TO.
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162 If METHOD is a string, it is a shell command;
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163 otherwise, it should be a Lisp function.
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164 BUFFER should be the buffer that the output originally came from."
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165 (if (stringp method)
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166 (save-current-buffer
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167 (set-buffer buffer)
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168 (with-output-to-temp-buffer "*Format Errors*"
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169 (shell-command-on-region from to method t nil standard-output))
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170 (point))
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171 (funcall method from to buffer)))
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172
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173 (defun format-decode-run-method (method from to &optional buffer)
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174 "Decode using function or shell script METHOD the text from FROM to TO.
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175 If METHOD is a string, it is a shell command;
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176 otherwise, it should be a Lisp function."
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177 (if (stringp method)
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178 (progn
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179 (with-output-to-temp-buffer "*Format Errors*"
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180 (shell-command-on-region from to method t nil standard-output))
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181 (point))
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182 (funcall method from to)))
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183
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184 (defun format-annotate-function (format from to orig-buf)
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209
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185 "Returns annotations for writing region as FORMAT.
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186 FORMAT is a symbol naming one of the formats defined in `format-alist',
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187 it must be a single symbol, not a list like `buffer-file-format'.
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188 FROM and TO delimit the region to be operated on in the current buffer.
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215
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189 ORIG-BUF is the original buffer that the data came from.
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209
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190 This function works like a function on `write-region-annotate-functions':
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191 it either returns a list of annotations, or returns with a different buffer
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192 current, which contains the modified text to write.
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193
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194 For most purposes, consider using `format-encode-region' instead."
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195 ;; This function is called by write-region (actually build-annotations)
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196 ;; for each element of buffer-file-format.
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197 (let* ((info (assq format format-alist))
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198 (to-fn (nth 4 info))
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199 (modify (nth 5 info)))
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200 (if to-fn
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201 (if modify
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202 ;; To-function wants to modify region. Copy to safe place.
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203 (let ((copy-buf (get-buffer-create " *Format Temp*")))
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204 (copy-to-buffer copy-buf from to)
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205 (set-buffer copy-buf)
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206 (format-insert-annotations write-region-annotations-so-far from)
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215
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207 (format-encode-run-method to-fn (point-min) (point-max) orig-buf)
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209
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208 nil)
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209 ;; Otherwise just call function, it will return annotations.
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215
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210 (funcall to-fn from to orig-buf)))))
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209
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211
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212 (defun format-decode (format length &optional visit-flag)
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213 ;; This function is called by insert-file-contents whenever a file is read.
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214 "Decode text from any known FORMAT.
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215 FORMAT is a symbol appearing in `format-alist' or a list of such symbols,
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216 or nil, in which case this function tries to guess the format of the data by
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217 matching against the regular expressions in `format-alist'. After a match is
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218 found and the region decoded, the alist is searched again from the beginning
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219 for another match.
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220
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221 Second arg LENGTH is the number of characters following point to operate on.
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222 If optional third arg VISIT-FLAG is true, set `buffer-file-format'
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223 to the list of formats used, and call any mode functions defined for those
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224 formats.
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225
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226 Returns the new length of the decoded region.
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227
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228 For most purposes, consider using `format-decode-region' instead."
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229 (let ((mod (buffer-modified-p))
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230 (begin (point))
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231 (end (+ (point) length)))
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232 (if (null format)
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233 ;; Figure out which format it is in, remember list in `format'.
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234 (let ((try format-alist))
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235 (while try
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236 (let* ((f (car try))
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237 (regexp (nth 2 f))
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238 (p (point)))
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239 (if (and regexp (looking-at regexp)
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240 (< (match-end 0) (+ begin length)))
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241 (progn
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242 (setq format (cons (car f) format))
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243 ;; Decode it
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215
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244 (if (nth 3 f)
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245 (setq end (format-decode-run-method (nth 3 f) begin end)))
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209
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246 ;; Call visit function if required
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247 (if (and visit-flag (nth 6 f)) (funcall (nth 6 f) 1))
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248 ;; Safeguard against either of the functions changing pt.
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249 (goto-char p)
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250 ;; Rewind list to look for another format
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251 (setq try format-alist))
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252 (setq try (cdr try))))))
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253 ;; Deal with given format(s)
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254 (or (listp format) (setq format (list format)))
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255 (let ((do format) f)
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256 (while do
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257 (or (setq f (assq (car do) format-alist))
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258 (error "Unknown format" (car do)))
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259 ;; Decode:
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215
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260 (if (nth 3 f)
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261 (setq end (format-decode-run-method (nth 3 f) begin end)))
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209
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262 ;; Call visit function if required
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263 (if (and visit-flag (nth 6 f)) (funcall (nth 6 f) 1))
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264 (setq do (cdr do)))))
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265 (if visit-flag
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266 (setq buffer-file-format format))
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267 (set-buffer-modified-p mod)
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268 ;; Return new length of region
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269 (- end begin)))
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270
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271 ;;;
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272 ;;; Interactive functions & entry points
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273 ;;;
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274
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275 (defun format-decode-buffer (&optional format)
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276 "Translate the buffer from some FORMAT.
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277 If the format is not specified, this function attempts to guess.
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278 `buffer-file-format' is set to the format used, and any mode-functions
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279 for the format are called."
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280 (interactive
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281 (list (format-read "Translate buffer from format (default: guess): ")))
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282 (save-excursion
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283 (goto-char (point-min))
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284 (format-decode format (buffer-size) t)))
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285
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286 (defun format-decode-region (from to &optional format)
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287 "Decode the region from some format.
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288 Arg FORMAT is optional; if omitted the format will be determined by looking
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289 for identifying regular expressions at the beginning of the region."
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290 (interactive
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291 (list (region-beginning) (region-end)
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292 (format-read "Translate region from format (default: guess): ")))
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293 (save-excursion
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294 (goto-char from)
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295 (format-decode format (- to from) nil)))
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296
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297 (defun format-encode-buffer (&optional format)
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298 "Translate the buffer into FORMAT.
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299 FORMAT defaults to `buffer-file-format'. It is a symbol naming one of the
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300 formats defined in `format-alist', or a list of such symbols."
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301 (interactive
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302 (list (format-read (format "Translate buffer to format (default %s): "
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303 buffer-file-format))))
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304 (format-encode-region (point-min) (point-max) format))
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305
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306 (defun format-encode-region (beg end &optional format)
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307 "Translate the region into some FORMAT.
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308 FORMAT defaults to `buffer-file-format', it is a symbol naming
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309 one of the formats defined in `format-alist', or a list of such symbols."
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310 (interactive
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311 (list (region-beginning) (region-end)
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312 (format-read (format "Translate region to format (default %s): "
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313 buffer-file-format))))
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314 (if (null format) (setq format buffer-file-format))
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315 (if (symbolp format) (setq format (list format)))
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316 (save-excursion
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317 (goto-char end)
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318 (let ( ; (cur-buf (current-buffer))
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319 (end (point-marker)))
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320 (while format
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321 (let* ((info (assq (car format) format-alist))
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322 (to-fn (nth 4 info))
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323 (modify (nth 5 info))
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324 ;; result
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325 )
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326 (if to-fn
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327 (if modify
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215
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328 (setq end (format-encode-run-method to-fn beg end
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329 (current-buffer)))
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209
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330 (format-insert-annotations
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331 (funcall to-fn beg end (current-buffer)))))
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332 (setq format (cdr format)))))))
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333
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334 (defun format-write-file (filename format)
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335 "Write current buffer into a FILE using some FORMAT.
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336 Makes buffer visit that file and sets the format as the default for future
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337 saves. If the buffer is already visiting a file, you can specify a directory
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338 name as FILE, to write a file of the same old name in that directory."
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339 (interactive
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340 ;; Same interactive spec as write-file, plus format question.
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341 (let* ((file (if buffer-file-name
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342 (read-file-name "Write file: "
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343 nil nil nil nil)
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344 (read-file-name "Write file: "
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345 (cdr (assq 'default-directory
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346 (buffer-local-variables)))
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347 nil nil (buffer-name))))
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348 (fmt (format-read (format "Write file `%s' in format: "
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349 (file-name-nondirectory file)))))
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350 (list file fmt)))
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351 (setq buffer-file-format format)
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352 (write-file filename))
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353
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354 (defun format-find-file (filename format)
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355 "Find the file FILE using data format FORMAT.
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356 If FORMAT is nil then do not do any format conversion."
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357 (interactive
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358 ;; Same interactive spec as write-file, plus format question.
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|
|
359 (let* ((file (read-file-name "Find file: "))
|
|
|
360 (fmt (format-read (format "Read file `%s' in format: "
|
|
|
361 (file-name-nondirectory file)))))
|
|
|
362 (list file fmt)))
|
|
|
363 (let ((format-alist nil))
|
|
|
364 (find-file filename))
|
|
|
365 (if format
|
|
|
366 (format-decode-buffer format)))
|
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367
|
|
|
368 (defun format-insert-file (filename format &optional beg end)
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|
|
369 "Insert the contents of file FILE using data format FORMAT.
|
|
|
370 If FORMAT is nil then do not do any format conversion.
|
|
|
371 The optional third and fourth arguments BEG and END specify
|
|
|
372 the part of the file to read.
|
|
|
373
|
|
|
374 The return value is like the value of `insert-file-contents':
|
|
|
375 a list (ABSOLUTE-FILE-NAME . SIZE)."
|
|
|
376 (interactive
|
|
|
377 ;; Same interactive spec as write-file, plus format question.
|
|
|
378 (let* ((file (read-file-name "Find file: "))
|
|
|
379 (fmt (format-read (format "Read file `%s' in format: "
|
|
|
380 (file-name-nondirectory file)))))
|
|
|
381 (list file fmt)))
|
|
|
382 (let (value size)
|
|
|
383 (let ((format-alist nil))
|
|
|
384 (setq value (insert-file-contents filename nil beg end))
|
|
|
385 (setq size (nth 1 value)))
|
|
|
386 (if format
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|
|
387 (setq size (format-decode format size)
|
|
|
388 value (cons (car value) size)))
|
|
|
389 value))
|
|
|
390
|
|
|
391 (defun format-read (&optional prompt)
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|
|
392 "Read and return the name of a format.
|
|
|
393 Return value is a list, like `buffer-file-format'; it may be nil.
|
|
|
394 Formats are defined in `format-alist'. Optional arg is the PROMPT to use."
|
|
|
395 (let* ((table (mapcar (lambda (x) (list (symbol-name (car x))))
|
|
|
396 format-alist))
|
|
|
397 (ans (completing-read (or prompt "Format: ") table nil t)))
|
|
|
398 (if (not (equal "" ans)) (list (intern ans)))))
|
|
|
399
|
|
|
400
|
|
|
401 ;;;
|
|
|
402 ;;; Below are some functions that may be useful in writing encoding and
|
|
|
403 ;;; decoding functions for use in format-alist.
|
|
|
404 ;;;
|
|
|
405
|
|
|
406 (defun format-replace-strings (alist &optional reverse beg end)
|
|
|
407 "Do multiple replacements on the buffer.
|
|
|
408 ALIST is a list of (from . to) pairs, which should be proper arguments to
|
|
|
409 `search-forward' and `replace-match' respectively.
|
|
|
410 Optional 2nd arg REVERSE, if non-nil, means the pairs are (to . from), so that
|
|
|
411 you can use the same list in both directions if it contains only literal
|
|
|
412 strings.
|
|
|
413 Optional args BEGIN and END specify a region of the buffer to operate on."
|
|
|
414 (save-excursion
|
|
|
415 (save-restriction
|
|
|
416 (or beg (setq beg (point-min)))
|
|
|
417 (if end (narrow-to-region (point-min) end))
|
|
|
418 (while alist
|
|
|
419 (let ((from (if reverse (cdr (car alist)) (car (car alist))))
|
|
|
420 (to (if reverse (car (cdr alist)) (cdr (car alist)))))
|
|
|
421 (goto-char beg)
|
|
|
422 (while (search-forward from nil t)
|
|
|
423 (goto-char (match-beginning 0))
|
|
|
424 (insert to)
|
|
|
425 (set-text-properties (- (point) (length to)) (point)
|
|
|
426 (text-properties-at (point)))
|
|
|
427 (delete-region (point) (+ (point) (- (match-end 0)
|
|
|
428 (match-beginning 0)))))
|
|
|
429 (setq alist (cdr alist)))))))
|
|
|
430
|
|
|
431 ;;; Some list-manipulation functions that we need.
|
|
|
432
|
|
|
433 (defun format-delq-cons (cons list)
|
|
|
434 "Remove the given CONS from LIST by side effect,
|
|
|
435 and return the new LIST. Since CONS could be the first element
|
|
|
436 of LIST, write `\(setq foo \(format-delq-cons element foo))' to be sure of
|
|
|
437 changing the value of `foo'."
|
|
|
438 (if (eq cons list)
|
|
|
439 (cdr list)
|
|
|
440 (let ((p list))
|
|
|
441 (while (not (eq (cdr p) cons))
|
|
|
442 (if (null p) (error "format-delq-cons: not an element."))
|
|
|
443 (setq p (cdr p)))
|
|
|
444 ;; Now (cdr p) is the cons to delete
|
|
|
445 (setcdr p (cdr cons))
|
|
|
446 list)))
|
|
|
447
|
|
|
448 (defun format-make-relatively-unique (a b)
|
|
|
449 "Delete common elements of lists A and B, return as pair.
|
|
|
450 Compares using `equal'."
|
|
|
451 (let* ((acopy (copy-sequence a))
|
|
|
452 (bcopy (copy-sequence b))
|
|
|
453 (tail acopy))
|
|
|
454 (while tail
|
|
|
455 (let ((dup (member (car tail) bcopy))
|
|
|
456 (next (cdr tail)))
|
|
|
457 (if dup (setq acopy (format-delq-cons tail acopy)
|
|
|
458 bcopy (format-delq-cons dup bcopy)))
|
|
|
459 (setq tail next)))
|
|
|
460 (cons acopy bcopy)))
|
|
|
461
|
|
|
462 (defun format-common-tail (a b)
|
|
|
463 "Given two lists that have a common tail, return it.
|
|
|
464 Compares with `equal', and returns the part of A that is equal to the
|
|
|
465 equivalent part of B. If even the last items of the two are not equal,
|
|
|
466 returns nil."
|
|
|
467 (let ((la (length a))
|
|
|
468 (lb (length b)))
|
|
|
469 ;; Make sure they are the same length
|
|
|
470 (if (> la lb)
|
|
|
471 (setq a (nthcdr (- la lb) a))
|
|
|
472 (setq b (nthcdr (- lb la) b))))
|
|
|
473 (while (not (equal a b))
|
|
|
474 (setq a (cdr a)
|
|
|
475 b (cdr b)))
|
|
|
476 a)
|
|
|
477
|
|
|
478 (defun format-reorder (items order)
|
|
|
479 "Arrange ITEMS to following partial ORDER.
|
|
|
480 Elements of ITEMS equal to elements of ORDER will be rearranged to follow the
|
|
|
481 ORDER. Unmatched items will go last."
|
|
|
482 (if order
|
|
|
483 (let ((item (member (car order) items)))
|
|
|
484 (if item
|
|
|
485 (cons (car item)
|
|
|
486 (format-reorder (format-delq-cons item items)
|
|
|
487 (cdr order)))
|
|
|
488 (format-reorder items (cdr order))))
|
|
|
489 items))
|
|
|
490
|
|
|
491 (put 'face 'format-list-valued t) ; These text-properties take values
|
|
|
492 (put 'unknown 'format-list-valued t) ; that are lists, the elements of which
|
|
|
493 ; should be considered separately.
|
|
|
494 ; See format-deannotate-region and
|
|
|
495 ; format-annotate-region.
|
|
|
496
|
|
|
497 ;;;
|
|
|
498 ;;; Decoding
|
|
|
499 ;;;
|
|
|
500
|
|
|
501 (defun format-deannotate-region (from to translations next-fn)
|
|
|
502 "Translate annotations in the region into text properties.
|
|
|
503 This sets text properties between FROM to TO as directed by the
|
|
|
504 TRANSLATIONS and NEXT-FN arguments.
|
|
|
505
|
|
|
506 NEXT-FN is a function that searches forward from point for an annotation.
|
|
|
507 It should return a list of 4 elements: \(BEGIN END NAME POSITIVE). BEGIN and
|
|
|
508 END are buffer positions bounding the annotation, NAME is the name searched
|
|
|
509 for in TRANSLATIONS, and POSITIVE should be non-nil if this annotation marks
|
|
|
510 the beginning of a region with some property, or nil if it ends the region.
|
|
|
511 NEXT-FN should return nil if there are no annotations after point.
|
|
|
512
|
|
|
513 The basic format of the TRANSLATIONS argument is described in the
|
|
|
514 documentation for the `format-annotate-region' function. There are some
|
|
|
515 additional things to keep in mind for decoding, though:
|
|
|
516
|
|
|
517 When an annotation is found, the TRANSLATIONS list is searched for a
|
|
|
518 text-property name and value that corresponds to that annotation. If the
|
|
|
519 text-property has several annotations associated with it, it will be used only
|
|
|
520 if the other annotations are also in effect at that point. The first match
|
|
|
521 found whose annotations are all present is used.
|
|
|
522
|
|
|
523 The text property thus determined is set to the value over the region between
|
|
|
524 the opening and closing annotations. However, if the text-property name has a
|
|
|
525 non-nil `format-list-valued' property, then the value will be consed onto the
|
|
|
526 surrounding value of the property, rather than replacing that value.
|
|
|
527
|
|
|
528 There are some special symbols that can be used in the \"property\" slot of
|
|
|
529 the TRANSLATIONS list: PARAMETER and FUNCTION \(spelled in uppercase).
|
|
|
530 Annotations listed under the pseudo-property PARAMETER are considered to be
|
|
|
531 arguments of the immediately surrounding annotation; the text between the
|
|
|
532 opening and closing parameter annotations is deleted from the buffer but saved
|
|
|
533 as a string. The surrounding annotation should be listed under the
|
|
|
534 pseudo-property FUNCTION. Instead of inserting a text-property for this
|
|
|
535 annotation, the function listed in the VALUE slot is called to make whatever
|
|
|
536 changes are appropriate. The function's first two arguments are the START and
|
|
|
537 END locations, and the rest of the arguments are any PARAMETERs found in that
|
|
|
538 region.
|
|
|
539
|
|
|
540 Any annotations that are found by NEXT-FN but not defined by TRANSLATIONS
|
|
|
541 are saved as values of the `unknown' text-property \(which is list-valued).
|
|
|
542 The TRANSLATIONS list should usually contain an entry of the form
|
|
|
543 \(unknown \(nil format-annotate-value))
|
|
|
544 to write these unknown annotations back into the file."
|
|
|
545 (save-excursion
|
|
|
546 (save-restriction
|
|
|
547 (narrow-to-region (point-min) to)
|
|
|
548 (goto-char from)
|
|
|
549 (let (next open-ans todo
|
|
|
550 ;; loc
|
|
|
551 unknown-ans)
|
|
|
552 (while (setq next (funcall next-fn))
|
|
|
553 (let* ((loc (nth 0 next))
|
|
|
554 (end (nth 1 next))
|
|
|
555 (name (nth 2 next))
|
|
|
556 (positive (nth 3 next))
|
|
|
557 (found nil))
|
|
|
558
|
|
|
559 ;; Delete the annotation
|
|
|
560 (delete-region loc end)
|
|
215
|
561 (cond
|
|
|
562 ;; Positive annotations are stacked, remembering location
|
|
|
563 (positive (setq open-ans (cons `(,name ((,loc . nil))) open-ans)))
|
|
|
564 ;; It is a negative annotation:
|
|
|
565 ;; Close the top annotation & add its text property.
|
|
|
566 ;; If the file's nesting is messed up, the close might not match
|
|
|
567 ;; the top thing on the open-annotations stack.
|
|
|
568 ;; If no matching annotation is open, just ignore the close.
|
|
|
569 ((not (assoc name open-ans))
|
|
|
570 (message "Extra closing annotation (%s) in file" name))
|
|
|
571 ;; If one is open, but not on the top of the stack, close
|
|
|
572 ;; the things in between as well. Set `found' when the real
|
|
|
573 ;; one is closed.
|
|
|
574 (t
|
|
|
575 (while (not found)
|
|
|
576 (let* ((top (car open-ans)) ; first on stack: should match.
|
|
|
577 (top-name (car top)) ; text property name
|
|
|
578 (top-extents (nth 1 top)) ; property regions
|
|
|
579 (params (cdr (cdr top))) ; parameters
|
|
|
580 (aalist translations)
|
|
|
581 (matched nil))
|
|
|
582 (if (equal name top-name)
|
|
|
583 (setq found t)
|
|
|
584 (message "Improper nesting in file."))
|
|
|
585 ;; Look through property names in TRANSLATIONS
|
|
|
586 (while aalist
|
|
|
587 (let ((prop (car (car aalist)))
|
|
|
588 (alist (cdr (car aalist))))
|
|
|
589 ;; And look through values for each property
|
|
|
590 (while alist
|
|
|
591 (let ((value (car (car alist)))
|
|
|
592 (ans (cdr (car alist))))
|
|
|
593 (if (member top-name ans)
|
|
|
594 ;; This annotation is listed, but still have to
|
|
|
595 ;; check if multiple annotations are satisfied
|
|
|
596 (if (member nil (mapcar (lambda (r)
|
|
|
597 (assoc r open-ans))
|
|
|
598 ans))
|
|
|
599 nil ; multiple ans not satisfied
|
|
|
600 ;; If there are multiple annotations going
|
|
|
601 ;; into one text property, split up the other
|
|
|
602 ;; annotations so they apply individually to
|
|
|
603 ;; the other regions.
|
|
|
604 (setcdr (car top-extents) loc)
|
|
|
605 (let ((to-split ans) this-one extents)
|
|
|
606 (while to-split
|
|
|
607 (setq this-one
|
|
|
608 (assoc (car to-split) open-ans)
|
|
|
609 extents (nth 1 this-one))
|
|
|
610 (if (not (eq this-one top))
|
|
|
611 (setcar (cdr this-one)
|
|
|
612 (format-subtract-regions
|
|
|
613 extents top-extents)))
|
|
|
614 (setq to-split (cdr to-split))))
|
|
|
615 ;; Set loop variables to nil so loop
|
|
|
616 ;; will exit.
|
|
|
617 (setq alist nil aalist nil matched t
|
|
|
618 ;; pop annotation off stack.
|
|
|
619 open-ans (cdr open-ans))
|
|
|
620 (let ((extents top-extents)
|
|
|
621 (start (car (car top-extents)))
|
|
|
622 (loc (cdr (car top-extents))))
|
|
|
623 (while extents
|
|
|
624 (cond
|
|
|
625 ;; Check for pseudo-properties
|
|
|
626 ((eq prop 'PARAMETER)
|
|
|
627 ;; A parameter of the top open ann:
|
|
|
628 ;; delete text and use as arg.
|
|
|
629 (if open-ans
|
|
|
630 ;; (If nothing open, discard).
|
|
|
631 (setq open-ans
|
|
|
632 (cons
|
|
|
633 (append (car open-ans)
|
|
|
634 (list
|
|
|
635 (buffer-substring
|
|
|
636 start loc)))
|
|
|
637 (cdr open-ans))))
|
|
|
638 (delete-region start loc))
|
|
|
639 ((eq prop 'FUNCTION)
|
|
|
640 ;; Not a property, but a function.
|
|
|
641 (let ((rtn
|
|
|
642 (apply value start loc params)))
|
|
|
643 (if rtn (setq todo (cons rtn todo)))))
|
|
|
644 (t
|
|
|
645 ;; Normal property/value pair
|
|
|
646 (setq todo
|
|
|
647 (cons (list start loc prop value)
|
|
|
648 todo))))
|
|
|
649 (setq extents (cdr extents)
|
|
|
650 start (car (car extents))
|
|
|
651 loc (cdr (car extents))))))))
|
|
|
652 (setq alist (cdr alist))))
|
|
|
653 (setq aalist (cdr aalist)))
|
|
|
654 (if (not matched)
|
|
209
|
655 ;; Didn't find any match for the annotation:
|
|
|
656 ;; Store as value of text-property `unknown'.
|
|
215
|
657 (let ((extents top-extents)
|
|
|
658 (start (car (car top-extents)))
|
|
|
659 (loc (cdr (car top-extents))))
|
|
|
660 (while extents
|
|
|
661 (setq open-ans (cdr open-ans)
|
|
|
662 todo (cons (list start loc 'unknown top-name)
|
|
|
663 todo)
|
|
|
664 unknown-ans (cons name unknown-ans)
|
|
|
665 extents (cdr extents)
|
|
|
666 start (car (car extents))
|
|
|
667 loc (cdr (car extents))))))))))))
|
|
209
|
668
|
|
|
669 ;; Once entire file has been scanned, add the properties.
|
|
|
670 (while todo
|
|
|
671 (let* ((item (car todo))
|
|
|
672 (from (nth 0 item))
|
|
|
673 (to (nth 1 item))
|
|
|
674 (prop (nth 2 item))
|
|
|
675 (val (nth 3 item)))
|
|
215
|
676
|
|
|
677 (if (numberp val) ; add to ambient value if numeric
|
|
|
678 (format-property-increment-region from to prop val 0)
|
|
|
679 (put-text-property
|
|
209
|
680 from to prop
|
|
215
|
681 (cond ((get prop 'format-list-valued) ; value gets consed onto
|
|
209
|
682 ; list-valued properties
|
|
|
683 (let ((prev (get-text-property from prop)))
|
|
|
684 (cons val (if (listp prev) prev (list prev)))))
|
|
215
|
685 (t val))))) ; normally, just set to val.
|
|
209
|
686 (setq todo (cdr todo)))
|
|
215
|
687
|
|
209
|
688 (if unknown-ans
|
|
|
689 (message "Unknown annotations: %s" unknown-ans))))))
|
|
|
690
|
|
215
|
691 (defun format-subtract-regions (minu subtra)
|
|
|
692 "Remove the regions in SUBTRAHEND from the regions in MINUEND. A region
|
|
|
693 is a dotted pair (from . to). Both parameters are lists of regions. Each
|
|
|
694 list must contain nonoverlapping, noncontiguous regions, in descending
|
|
|
695 order. The result is also nonoverlapping, noncontiguous, and in descending
|
|
|
696 order. The first element of MINUEND can have a cdr of nil, indicating that
|
|
|
697 the end of that region is not yet known."
|
|
|
698 (let* ((minuend (copy-alist minu))
|
|
|
699 (subtrahend (copy-alist subtra))
|
|
|
700 (m (car minuend))
|
|
|
701 (s (car subtrahend))
|
|
|
702 results)
|
|
|
703 (while (and minuend subtrahend)
|
|
|
704 (cond
|
|
|
705 ;; The minuend starts after the subtrahend ends; keep it.
|
|
|
706 ((> (car m) (cdr s))
|
|
|
707 (setq results (cons m results)
|
|
|
708 minuend (cdr minuend)
|
|
|
709 m (car minuend)))
|
|
|
710 ;; The minuend extends beyond the end of the subtrahend. Chop it off.
|
|
|
711 ((or (null (cdr m)) (> (cdr m) (cdr s)))
|
|
|
712 (setq results (cons (cons (1+ (cdr s)) (cdr m)) results))
|
|
|
713 (setcdr m (cdr s)))
|
|
|
714 ;; The subtrahend starts after the minuend ends; throw it away.
|
|
|
715 ((< (cdr m) (car s))
|
|
|
716 (setq subtrahend (cdr subtrahend) s (car subtrahend)))
|
|
|
717 ;; The subtrahend extends beyond the end of the minuend. Chop it off.
|
|
|
718 (t ;(<= (cdr m) (cdr s)))
|
|
|
719 (if (>= (car m) (car s))
|
|
|
720 (setq minuend (cdr minuend) m (car minuend))
|
|
|
721 (setcdr m (1- (car s)))
|
|
|
722 (setq subtrahend (cdr subtrahend) s (car subtrahend))))))
|
|
|
723 (nconc (nreverse results) minuend)))
|
|
|
724
|
|
|
725 ;; This should probably go somewhere other than format.el. Then again,
|
|
|
726 ;; indent.el has alter-text-property. NOTE: We can also use
|
|
|
727 ;; next-single-property-change instead of text-property-not-all, but then
|
|
|
728 ;; we have to see if we passed TO.
|
|
|
729 (defun format-property-increment-region (from to prop delta default)
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730 "Increment property PROP over the region between FROM and TO by the
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731 amount DELTA (which may be negative). If property PROP is nil anywhere
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732 in the region, it is treated as though it were DEFAULT."
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733 (let ((cur from) val newval next)
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734 (while cur
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735 (setq val (get-text-property cur prop)
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736 newval (+ (or val default) delta)
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737 next (text-property-not-all cur to prop val))
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738 (put-text-property cur (or next to) prop newval)
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739 (setq cur next))))
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740
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|
209
|
741 ;;;
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|
742 ;;; Encoding
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|
743 ;;;
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744
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745 (defun format-insert-annotations (list &optional offset)
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746 "Apply list of annotations to buffer as `write-region' would.
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747 Inserts each element of the given LIST of buffer annotations at its
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|
748 appropriate place. Use second arg OFFSET if the annotations' locations are
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749 not relative to the beginning of the buffer: annotations will be inserted
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|
750 at their location-OFFSET+1 \(ie, the offset is treated as the character number
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|
751 of the first character in the buffer)."
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752 (if (not offset)
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753 (setq offset 0)
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754 (setq offset (1- offset)))
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755 (let ((l (reverse list)))
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756 (while l
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|
757 (goto-char (- (car (car l)) offset))
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758 (insert (cdr (car l)))
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759 (setq l (cdr l)))))
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760
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761 (defun format-annotate-value (old new)
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762 "Return OLD and NEW as a \(close . open) annotation pair.
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763 Useful as a default function for TRANSLATIONS alist when the value of the text
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764 property is the name of the annotation that you want to use, as it is for the
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765 `unknown' text property."
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766 (cons (if old (list old))
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767 (if new (list new))))
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768
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769 (defun format-annotate-region (from to trans format-fn ignore)
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770 "Generate annotations for text properties in the region.
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771 Searches for changes between FROM and TO, and describes them with a list of
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772 annotations as defined by alist TRANSLATIONS and FORMAT-FN. IGNORE lists text
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773 properties not to consider; any text properties that are neither ignored nor
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774 listed in TRANSLATIONS are warned about.
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775 If you actually want to modify the region, give the return value of this
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776 function to `format-insert-annotations'.
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777
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778 Format of the TRANSLATIONS argument:
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779
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780 Each element is a list whose car is a PROPERTY, and the following
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781 elements are VALUES of that property followed by the names of zero or more
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782 ANNOTATIONS. Whenever the property takes on that value, the annotations
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783 \(as formatted by FORMAT-FN) are inserted into the file.
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784 When the property stops having that value, the matching negated annotation
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785 will be inserted \(it may actually be closed earlier and reopened, if
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786 necessary, to keep proper nesting).
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787
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788 If the property's value is a list, then each element of the list is dealt with
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789 separately.
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790
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791 If a VALUE is numeric, then it is assumed that there is a single annotation
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792 and each occurrence of it increments the value of the property by that number.
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793 Thus, given the entry \(left-margin \(4 \"indent\")), if the left margin
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794 changes from 4 to 12, two <indent> annotations will be generated.
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795
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796 If the VALUE is nil, then instead of annotations, a function should be
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797 specified. This function is used as a default: it is called for all
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798 transitions not explicitly listed in the table. The function is called with
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799 two arguments, the OLD and NEW values of the property. It should return
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|
800 lists of annotations like `format-annotate-location' does.
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801
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802 The same structure can be used in reverse for reading files."
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803 (let ((all-ans nil) ; All annotations - becomes return value
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804 (open-ans nil) ; Annotations not yet closed
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805 (loc nil) ; Current location
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806 (not-found nil)) ; Properties that couldn't be saved
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807 (while (or (null loc)
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808 (and (setq loc (next-property-change loc nil to))
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809 (< loc to)))
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810 (or loc (setq loc from))
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811 (let* ((ans (format-annotate-location loc (= loc from) ignore trans))
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812 (neg-ans (format-reorder (aref ans 0) open-ans))
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813 (pos-ans (aref ans 1))
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814 (ignored (aref ans 2)))
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815 (setq not-found (append ignored not-found)
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816 ignore (append ignored ignore))
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|
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817 ;; First do the negative (closing) annotations
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818 (while neg-ans
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|
819 ;; Check if it's missing. This can happen (eg, a numeric property
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|
820 ;; going negative can generate closing annotations before there are
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|
821 ;; any open). Warn user & ignore.
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|
822 (if (not (member (car neg-ans) open-ans))
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|
823 (message "Can't close %s: not open." (car neg-ans))
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|
|
824 (while (not (equal (car neg-ans) (car open-ans)))
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825 ;; To close anno. N, need to first close ans 1 to N-1,
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|
826 ;; remembering to re-open them later.
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|
827 (setq pos-ans (cons (car open-ans) pos-ans))
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|
|
828 (setq all-ans
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|
|
829 (cons (cons loc (funcall format-fn (car open-ans) nil))
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|
830 all-ans))
|
|
|
831 (setq open-ans (cdr open-ans)))
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|
|
832 ;; Now remove the one we're really interested in from open list.
|
|
|
833 (setq open-ans (cdr open-ans))
|
|
|
834 ;; And put the closing annotation here.
|
|
|
835 (setq all-ans
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|
|
836 (cons (cons loc (funcall format-fn (car neg-ans) nil))
|
|
|
837 all-ans)))
|
|
|
838 (setq neg-ans (cdr neg-ans)))
|
|
|
839 ;; Now deal with positive (opening) annotations
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|
|
840 (let ( ; (p pos-ans)
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|
|
841 )
|
|
|
842 (while pos-ans
|
|
|
843 (setq open-ans (cons (car pos-ans) open-ans))
|
|
|
844 (setq all-ans
|
|
|
845 (cons (cons loc (funcall format-fn (car pos-ans) t))
|
|
|
846 all-ans))
|
|
|
847 (setq pos-ans (cdr pos-ans))))))
|
|
|
848
|
|
|
849 ;; Close any annotations still open
|
|
|
850 (while open-ans
|
|
|
851 (setq all-ans
|
|
|
852 (cons (cons to (funcall format-fn (car open-ans) nil))
|
|
|
853 all-ans))
|
|
|
854 (setq open-ans (cdr open-ans)))
|
|
|
855 (if not-found
|
|
|
856 (message "These text properties could not be saved:\n %s"
|
|
|
857 not-found))
|
|
|
858 (nreverse all-ans)))
|
|
|
859
|
|
|
860 ;;; Internal functions for format-annotate-region.
|
|
|
861
|
|
|
862 (defun format-annotate-location (loc all ignore trans)
|
|
|
863 "Return annotation(s) needed at LOCATION.
|
|
|
864 This includes any properties that change between LOC-1 and LOC.
|
|
|
865 If ALL is true, don't look at previous location, but generate annotations for
|
|
|
866 all non-nil properties.
|
|
|
867 Third argument IGNORE is a list of text-properties not to consider.
|
|
|
868
|
|
|
869 Return value is a vector of 3 elements:
|
|
|
870 1. List of names of the annotations to close
|
|
|
871 2. List of the names of annotations to open.
|
|
|
872 3. List of properties that were ignored or couldn't be annotated."
|
|
|
873 (let* ((prev-loc (1- loc))
|
|
|
874 (before-plist (if all nil (text-properties-at prev-loc)))
|
|
|
875 (after-plist (text-properties-at loc))
|
|
|
876 p negatives positives prop props not-found)
|
|
|
877 ;; make list of all property names involved
|
|
|
878 (setq p before-plist)
|
|
|
879 (while p
|
|
|
880 (if (not (memq (car p) props))
|
|
|
881 (setq props (cons (car p) props)))
|
|
|
882 (setq p (cdr (cdr p))))
|
|
|
883 (setq p after-plist)
|
|
|
884 (while p
|
|
|
885 (if (not (memq (car p) props))
|
|
|
886 (setq props (cons (car p) props)))
|
|
|
887 (setq p (cdr (cdr p))))
|
|
|
888
|
|
|
889 (while props
|
|
|
890 (setq prop (car props)
|
|
|
891 props (cdr props))
|
|
|
892 (if (memq prop ignore)
|
|
|
893 nil ; If it's been ignored before, ignore it now.
|
|
|
894 (let ((before (if all nil (car (cdr (memq prop before-plist)))))
|
|
|
895 (after (car (cdr (memq prop after-plist)))))
|
|
|
896 (if (equal before after)
|
|
|
897 nil ; no change; ignore
|
|
|
898 (let ((result (format-annotate-single-property-change
|
|
|
899 prop before after trans)))
|
|
|
900 (if (not result)
|
|
|
901 (setq not-found (cons prop not-found))
|
|
|
902 (setq negatives (nconc negatives (car result))
|
|
|
903 positives (nconc positives (cdr result)))))))))
|
|
|
904 (vector negatives positives not-found)))
|
|
|
905
|
|
|
906 (defun format-annotate-single-property-change (prop old new trans)
|
|
|
907 "Return annotations for PROPERTY changing from OLD to NEW.
|
|
|
908 These are searched for in the TRANSLATIONS alist.
|
|
|
909 If NEW does not appear in the list, but there is a default function, then that
|
|
|
910 function is called.
|
|
|
911 Annotations to open and to close are returned as a dotted pair."
|
|
|
912 (let ((prop-alist (cdr (assoc prop trans)))
|
|
|
913 ;; default
|
|
|
914 )
|
|
|
915 (if (not prop-alist)
|
|
|
916 nil
|
|
|
917 ;; If either old or new is a list, have to treat both that way.
|
|
|
918 (if (or (consp old) (consp new))
|
|
|
919 (let* ((old (if (listp old) old (list old)))
|
|
|
920 (new (if (listp new) new (list new)))
|
|
|
921 ;; (tail (format-common-tail old new))
|
|
|
922 close open)
|
|
|
923 (while old
|
|
|
924 (setq close
|
|
|
925 (append (car (format-annotate-atomic-property-change
|
|
|
926 prop-alist (car old) nil))
|
|
|
927 close)
|
|
|
928 old (cdr old)))
|
|
|
929 (while new
|
|
|
930 (setq open
|
|
|
931 (append (cdr (format-annotate-atomic-property-change
|
|
|
932 prop-alist nil (car new)))
|
|
|
933 open)
|
|
|
934 new (cdr new)))
|
|
|
935 (format-make-relatively-unique close open))
|
|
|
936 (format-annotate-atomic-property-change prop-alist old new)))))
|
|
|
937
|
|
|
938 (defun format-annotate-atomic-property-change (prop-alist old new)
|
|
|
939 "Internal function annotate a single property change.
|
|
|
940 PROP-ALIST is the relevant segment of a TRANSLATIONS list.
|
|
|
941 OLD and NEW are the values."
|
|
215
|
942 (let (num-ann)
|
|
|
943 ;; If old and new values are numbers,
|
|
|
944 ;; look for a number in PROP-ALIST.
|
|
|
945 (if (and (or (null old) (numberp old))
|
|
|
946 (or (null new) (numberp new)))
|
|
|
947 (progn
|
|
|
948 (setq num-ann prop-alist)
|
|
|
949 (while (and num-ann (not (numberp (car (car num-ann)))))
|
|
|
950 (setq num-ann (cdr num-ann)))))
|
|
|
951 (if num-ann
|
|
|
952 ;; Numerical annotation - use difference
|
|
|
953 (progn
|
|
|
954 ;; If property is numeric, nil means 0
|
|
|
955 (cond ((and (numberp old) (null new))
|
|
|
956 (setq new 0))
|
|
|
957 ((and (numberp new) (null old))
|
|
|
958 (setq old 0)))
|
|
209
|
959
|
|
215
|
960 (let* ((entry (car num-ann))
|
|
|
961 (increment (car entry))
|
|
|
962 (n (ceiling (/ (float (- new old)) (float increment))))
|
|
|
963 (anno (car (cdr entry))))
|
|
|
964 (if (> n 0)
|
|
|
965 (cons nil (make-list n anno))
|
|
|
966 (cons (make-list (- n) anno) nil))))
|
|
|
967
|
|
|
968 ;; Standard annotation
|
|
|
969 (let ((close (and old (cdr (assoc old prop-alist))))
|
|
209
|
970 (open (and new (cdr (assoc new prop-alist)))))
|
|
|
971 (if (or close open)
|
|
|
972 (format-make-relatively-unique close open)
|
|
|
973 ;; Call "Default" function, if any
|
|
|
974 (let ((default (assq nil prop-alist)))
|
|
|
975 (if default
|
|
|
976 (funcall (car (cdr default)) old new))))))))
|
|
|
977
|
|
|
978 ;;; format.el ends here
|
