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1 ;;; paragraphs.el --- paragraph and sentence parsing
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2
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3 ;; Copyright (C) 1985, 86, 87, 91, 94, 95, 96, 1997, 1999, 2000, 2001
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4 ;; Free Software Foundation, Inc.
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428
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5
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6 ;; Maintainer: FSF
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7 ;; Keywords: wp, dumped
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8
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9 ;; This file is part of XEmacs.
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10
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11 ;; XEmacs is free software; you can redistribute it and/or modify it
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12 ;; under the terms of the GNU General Public License as published by
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13 ;; the Free Software Foundation; either version 2, or (at your option)
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14 ;; any later version.
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15
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16 ;; XEmacs is distributed in the hope that it will be useful, but
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17 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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19 ;; General Public License for more details.
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20
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21 ;; You should have received a copy of the GNU General Public License
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22 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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23 ;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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24 ;; 02111-1307, USA.
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25
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26 ;;; Synched up with: FSF 21.3.
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428
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27
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28 ;;; Commentary:
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29
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30 ;; This file is dumped with XEmacs.
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31
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32 ;; This package provides the paragraph-oriented commands documented in the
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33 ;; XEmacs Reference Manual.
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34
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35 ;; 06/11/1997 - Use char-(after|before) instead of
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36 ;; (following|preceding)-char. -slb
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37
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38 ;;; Code:
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39
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40 (defgroup paragraphs nil
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41 "Paragraph and sentence parsing."
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42 :group 'editing)
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43
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44 (define-minor-mode use-hard-newlines
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428
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45 "Minor mode to distinguish hard and soft newlines.
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46 When active, the functions `newline' and `open-line' add the
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47 text-property `hard' to newlines that they insert, and a line is
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48 only considered as a candidate to match `paragraph-start' or
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49 `paragraph-separate' if it follows a hard newline.
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50
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51 Prefix argument says to turn mode on if positive, off if negative.
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52 When the mode is turned on, if there are newlines in the buffer but no hard
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53 newlines, ask the user whether to mark as hard any newlines preceeding a
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54 `paragraph-start' line. From a program, second arg INSERT specifies whether
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55 to do this; it can be `never' to change nothing, t or `always' to force
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56 marking, `guess' to try to do the right thing with no questions, nil
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57 or anything else to ask the user.
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58
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59 Newlines not marked hard are called \"soft\", and are always internal
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60 to paragraphs. The fill functions insert and delete only soft newlines."
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61 :group 'paragraphs
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62 :extra-args (insert)
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63 (when use-hard-newlines
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428
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64 ;; Turn mode on
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65 ;; Intuit hard newlines --
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66 ;; mark as hard any newlines preceding a paragraph-start line.
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67 (if (or (eq insert t) (eq insert 'always)
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68 (and (not (eq 'never insert))
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69 (not (text-property-any (point-min) (point-max) 'hard t))
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70 (save-excursion
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71 (goto-char (point-min))
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72 (search-forward "\n" nil t))
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73 (or (eq insert 'guess)
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74 (y-or-n-p "Make newlines between paragraphs hard? "))))
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75 (save-excursion
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76 (goto-char (point-min))
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77 (while (search-forward "\n" nil t)
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78 (let ((pos (point)))
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79 (move-to-left-margin)
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80 (when (looking-at paragraph-start)
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81 (set-hard-newline-properties (1- pos) pos))
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82 ;; If paragraph-separate, newline after it is hard too.
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83 (when (looking-at paragraph-separate)
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84 (set-hard-newline-properties (1- pos) pos)
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85 (end-of-line)
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86 (unless (eobp)
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87 (set-hard-newline-properties (point) (1+ (point)))))))))))
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428
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88
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89 (defcustom paragraph-start "\f\\|[ \t]*$" "\
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428
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90 *Regexp for beginning of a line that starts OR separates paragraphs.
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91 This regexp should match lines that separate paragraphs
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92 and should also match lines that start a paragraph
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93 \(and are part of that paragraph).
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94
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95 This is matched against the text at the left margin, which is not necessarily
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96 the beginning of the line, so it should never use \"^\" as an anchor. This
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97 ensures that the paragraph functions will work equally well within a region
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98 of text indented by a margin setting.
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99
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100 The variable `paragraph-separate' specifies how to distinguish
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101 lines that start paragraphs from lines that separate them.
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102
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103 If the variable `use-hard-newlines' is non-nil, then only lines following a
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104 hard newline are considered to match."
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105 :group 'paragraphs
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106 :type 'regexp)
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107
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108 ;; paragraph-start requires a hard newline, but paragraph-separate does not:
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109 ;; It is assumed that paragraph-separate is distinctive enough to be believed
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110 ;; whenever it occurs, while it is reasonable to set paragraph-start to
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111 ;; something very minimal, even including "." (which makes every hard newline
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112 ;; start a new paragraph).
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113
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114 (defcustom paragraph-separate "[ \t\f]*$"
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115 "*Regexp for beginning of a line that separates paragraphs.
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116 If you change this, you may have to change `paragraph-start' also.
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117
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118 A line matching this is not part of any paragraph.
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119
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120 This is matched against the text at the left margin, which is not necessarily
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121 the beginning of the line, so it should not use \"^\" as an anchor. This
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122 ensures that the paragraph functions will work equally within a region of
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123 text indented by a margin setting."
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124 :group 'paragraphs
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125 :type 'regexp)
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126
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127 (defcustom sentence-end-double-space t
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128 "*Non-nil means a single space does not end a sentence.
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129 This is relevant for filling. See also `sentence-end-without-period'
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130 and `colon-double-space'.
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131
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132 This variable applies only to filling, not motion commands. To
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133 change the behavior of motion commands, see `sentence-end'.
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134
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135 If you change this, you should also change `sentence-end'. See Info
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136 node `Sentences'."
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137 :type 'boolean
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138 :group 'fill)
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139
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140 (defcustom sentence-end-without-period nil
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141 "*Non-nil means a sentence will end without a period.
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142 For example, a sentence in Thai text ends with double space but
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143 without a period."
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144 :type 'boolean
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145 :group 'fill)
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146
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147 (defcustom sentence-end
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148 (purecopy
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149 ;; This is a bit stupid since it's not auto-updated when the
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150 ;; other variables are changed, but it's still useful info.
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151 (concat (if sentence-end-without-period "\\w \\|")
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152 "[.?!"
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153 (if (featurep 'mule)
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154 (decode-coding-string "\033$B!#!%!)!*\033$A!##.#?#!\033$(0!$!%!)!*\033$(G!$!%!)!*\033(B" 'iso-2022-7bit)
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155 "")
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156 "][]\"')}]*"
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157 (if sentence-end-double-space
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158 "\\($\\| $\\|\t\\| \\)" "\\($\\|[\t ]\\)")
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159 "[ \t\n]*"))
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160 "*Regexp describing the end of a sentence.
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161 The value includes the whitespace following the sentence.
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162 All paragraph boundaries also end sentences, regardless.
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163
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164 The default value specifies that in order to be recognized as the end
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165 of a sentence, the ending period, question mark, or exclamation point
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166 must be followed by two spaces, unless it's inside some sort of quotes
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167 or parenthesis.
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168
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169 See also the variable `sentence-end-double-space', the variable
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170 `sentence-end-without-period' and Info node `Sentences'."
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171 :group 'paragraphs
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172 :type 'regexp)
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173
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174 (defcustom page-delimiter "^\014"
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175 "*Regexp describing line-beginnings that separate pages."
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176 :group 'paragraphs
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177 :type 'regexp)
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178
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179 (defcustom paragraph-ignore-fill-prefix nil
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180 "*Non-nil means the paragraph commands are not affected by `fill-prefix'.
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181 This is desirable in modes where blank lines are the paragraph delimiters."
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182 :group 'paragraphs
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183 :type 'boolean)
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184
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185 (defun forward-paragraph (&optional arg)
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186 "Move forward to end of paragraph.
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187 With argument ARG, do it ARG times;
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188 a negative argument ARG = -N means move backward N paragraphs.
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189
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190 A line which `paragraph-start' matches either separates paragraphs
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191 \(if `paragraph-separate' matches it also) or is the first line of a paragraph.
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192 A paragraph end is the beginning of a line which is not part of the paragraph
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193 to which the end of the previous line belongs, or the end of the buffer.
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194 Returns the count of paragraphs left to move."
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195 (interactive "_p") ; XEmacs
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196 (or arg (setq arg 1))
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197 (let* ((opoint (point))
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198 (fill-prefix-regexp
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199 (and fill-prefix (not (equal fill-prefix ""))
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200 (not paragraph-ignore-fill-prefix)
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201 (regexp-quote fill-prefix)))
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202 ;; Remove ^ from paragraph-start and paragraph-sep if they are there.
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203 ;; These regexps shouldn't be anchored, because we look for them
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204 ;; starting at the left-margin. This allows paragraph commands to
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205 ;; work normally with indented text.
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206 ;; This hack will not find problem cases like "whatever\\|^something".
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207 (parstart (if (and (not (equal "" paragraph-start))
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208 (equal ?^ (aref paragraph-start 0)))
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209 (substring paragraph-start 1)
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210 paragraph-start))
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211 (parsep (if (and (not (equal "" paragraph-separate))
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212 (equal ?^ (aref paragraph-separate 0)))
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213 (substring paragraph-separate 1)
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214 paragraph-separate))
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215 (parsep
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216 (if fill-prefix-regexp
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217 (concat parsep "\\|"
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218 fill-prefix-regexp "[ \t]*$")
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219 parsep))
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220 ;; This is used for searching.
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221 (sp-parstart (concat "^[ \t]*\\(?:" parstart "\\|" parsep "\\)"))
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222 start found-start)
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223 (while (and (< arg 0) (not (bobp)))
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224 (if (and (not (looking-at parsep))
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225 (re-search-backward "^\n" (max (1- (point)) (point-min)) t)
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226 (looking-at parsep))
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227 (setq arg (1+ arg))
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228 (setq start (point))
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229 ;; Move back over paragraph-separating lines.
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446
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230 (backward-char 1) (beginning-of-line)
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231 (while (and (not (bobp))
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232 (progn (move-to-left-margin)
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233 (looking-at parsep)))
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234 (forward-line -1))
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235 (if (bobp)
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236 nil
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237 (setq arg (1+ arg))
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428
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238 ;; Go to end of the previous (non-separating) line.
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239 (end-of-line)
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240 ;; Search back for line that starts or separates paragraphs.
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241 (if (if fill-prefix-regexp
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242 ;; There is a fill prefix; it overrides parstart.
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428
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243 (let (multiple-lines)
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244 (while (and (progn (beginning-of-line) (not (bobp)))
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245 (progn (move-to-left-margin)
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246 (not (looking-at parsep)))
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247 (looking-at fill-prefix-regexp))
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248 (unless (= (point) start)
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249 (setq multiple-lines t))
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250 (forward-line -1))
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251 (move-to-left-margin)
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252 ;; This deleted code caused a long hanging-indent line
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253 ;; not to be filled together with the following lines.
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254 ;; ;; Don't move back over a line before the paragraph
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255 ;; ;; which doesn't start with fill-prefix
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256 ;; ;; unless that is the only line we've moved over.
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257 ;; (and (not (looking-at fill-prefix-regexp))
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258 ;; multiple-lines
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259 ;; (forward-line 1))
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428
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260 (not (bobp)))
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261 (while (and (re-search-backward sp-parstart nil 1)
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262 (setq found-start t)
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428
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263 ;; Found a candidate, but need to check if it is a
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264 ;; REAL parstart.
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265 (progn (setq start (point))
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266 (move-to-left-margin)
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267 (not (looking-at parsep)))
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268 (not (and (looking-at parstart)
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269 (or (not use-hard-newlines)
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270 (get-text-property (1- start) 'hard)
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271 (bobp)))))
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272 (setq found-start nil)
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273 (goto-char start))
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274 found-start)
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428
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275 ;; Found one.
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276 (progn
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277 ;; Move forward over paragraph separators.
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278 ;; We know this cannot reach the place we started
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279 ;; because we know we moved back over a non-separator.
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280 (while (and (not (eobp))
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281 (progn (move-to-left-margin)
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282 (looking-at parsep)))
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283 (forward-line 1))
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284 ;; If line before paragraph is just margin, back up to there.
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285 (end-of-line 0)
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286 (if (> (current-column) (current-left-margin))
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287 (forward-char 1)
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288 (skip-chars-backward " \t")
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289 (if (not (bolp))
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290 (forward-line 1))))
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291 ;; No starter or separator line => use buffer beg.
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292 (goto-char (point-min))))))
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293
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294 (while (and (> arg 0) (not (eobp)))
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295 ;; Move forward over separator lines...
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296 (while (and (not (eobp))
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297 (progn (move-to-left-margin) (not (eobp)))
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298 (looking-at parsep))
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299 (forward-line 1))
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300 (unless (eobp) (setq arg (1- arg)))
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301 ;; ... and one more line.
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302 (forward-line 1)
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428
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303 (if fill-prefix-regexp
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304 ;; There is a fill prefix; it overrides parstart.
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428
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305 (while (and (not (eobp))
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306 (progn (move-to-left-margin) (not (eobp)))
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307 (not (looking-at parsep))
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308 (looking-at fill-prefix-regexp))
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309 (forward-line 1))
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310 (while (and (re-search-forward sp-parstart nil 1)
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428
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311 (progn (setq start (match-beginning 0))
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312 (goto-char start)
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313 (not (eobp)))
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314 (progn (move-to-left-margin)
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315 (not (looking-at parsep)))
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316 (or (not (looking-at parstart))
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428
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317 (and use-hard-newlines
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318 (not (get-text-property (1- start) 'hard)))))
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319 (forward-char 1))
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320 (if (< (point) (point-max))
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321 (goto-char start))))
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322 (constrain-to-field nil opoint t)
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323 ;; Return the number of steps that could not be done.
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324 arg))
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428
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325
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326 (defun backward-paragraph (&optional arg)
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327 "Move backward to start of paragraph.
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328 With argument ARG, do it ARG times;
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329 a negative argument ARG = -N means move forward N paragraphs.
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428
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330
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331 A paragraph start is the beginning of a line which is a
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332 `first-line-of-paragraph' or which is ordinary text and follows a
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333 paragraph-separating line; except: if the first real line of a
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334 paragraph is preceded by a blank line, the paragraph starts at that
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335 blank line.
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336
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337 See `forward-paragraph' for more information."
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338 (interactive "_p") ; XEmacs
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339 (or arg (setq arg 1))
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340 (forward-paragraph (- arg)))
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341
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687
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342 (defun mark-paragraph (&optional arg)
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428
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343 "Put point at beginning of this paragraph, mark at end.
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687
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344 The paragraph marked is the one that contains point or follows point.
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345
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346 With argument ARG, puts mark at end of a following paragraph, so that
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347 the number of paragraphs marked equals ARG.
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348
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349 If ARG is negative, point is put at end of this paragraph, mark is put
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350 at beginning of this or a previous paragraph.
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351
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352 If this command is repeated, it marks the next ARG paragraphs after (or
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353 before, if arg is negative) the ones already marked."
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687
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354 (interactive "p")
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355 (unless arg (setq arg 1))
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356 (when (zerop arg)
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357 (error "Cannot mark zero paragraphs"))
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358 (cond ((and (eq last-command this-command) (mark t))
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359 (set-mark
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360 (save-excursion
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361 (goto-char (mark))
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362 (forward-paragraph arg)
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363 (point))))
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364 (t
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365 (forward-paragraph arg)
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366 (push-mark nil t t)
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367 (backward-paragraph arg))))
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428
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368
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369 (defun kill-paragraph (arg)
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370 "Kill forward to end of paragraph.
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371 With arg N, kill forward to Nth end of paragraph;
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372 negative arg -N means kill backward to Nth start of paragraph."
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373 (interactive "*p") ; XEmacs
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374 (kill-region (point) (progn (forward-paragraph arg) (point))))
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375
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376 (defun backward-kill-paragraph (arg)
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377 "Kill back to start of paragraph.
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378 With arg N, kill back to Nth start of paragraph;
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379 negative arg -N means kill forward to Nth end of paragraph."
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380 (interactive "*p") ; XEmacs
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381 (kill-region (point) (progn (backward-paragraph arg) (point))))
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382
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383 (defun transpose-paragraphs (arg)
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384 "Interchange this (or next) paragraph with previous one."
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385 (interactive "*p")
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386 (transpose-subr 'forward-paragraph arg))
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387
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388 (defun start-of-paragraph-text ()
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389 (let ((opoint (point)) npoint)
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390 (forward-paragraph -1)
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391 (setq npoint (point))
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392 (skip-chars-forward " \t\n")
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393 ;; If the range of blank lines found spans the original start point,
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394 ;; try again from the beginning of it.
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395 ;; Must be careful to avoid infinite loop
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396 ;; when following a single return at start of buffer.
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397 (if (and (>= (point) opoint) (< npoint opoint))
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398 (progn
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399 (goto-char npoint)
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400 (if (> npoint (point-min))
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401 (start-of-paragraph-text))))))
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402
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403 (defun end-of-paragraph-text ()
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404 (let ((opoint (point)))
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405 (forward-paragraph 1)
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446
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406 (if (eq (char-before (point)) ?\n) (backward-char 1))
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428
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407 (if (<= (point) opoint)
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408 (progn
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409 (forward-char 1)
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410 (if (< (point) (point-max))
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411 (end-of-paragraph-text))))))
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412
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413 (defun forward-sentence (&optional arg)
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414 "Move forward to next `sentence-end'. With argument, repeat.
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415 With negative argument, move backward repeatedly to `sentence-beginning'.
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416
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417 The variable `sentence-end' is a regular expression that matches ends of
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450
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418 sentences. A paragraph boundary also terminates a sentence."
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428
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419 (interactive "_p") ; XEmacs
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420 (or arg (setq arg 1))
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2549
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421 (let ((opoint (point)))
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422 (while (< arg 0)
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423 (let ((pos (point))
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424 (par-beg (save-excursion (start-of-paragraph-text) (point))))
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425 (if (and (re-search-backward sentence-end par-beg t)
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426 (or (< (match-end 0) pos)
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427 (re-search-backward sentence-end par-beg t)))
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428 (goto-char (match-end 0))
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429 (goto-char par-beg)))
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430 (setq arg (1+ arg)))
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431 (while (> arg 0)
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432 (let ((par-end (save-excursion (end-of-paragraph-text) (point))))
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433 (if (re-search-forward sentence-end par-end t)
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434 (skip-chars-backward " \t\n")
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435 (goto-char par-end)))
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436 (setq arg (1- arg)))
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437 (constrain-to-field nil opoint t)))
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428
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438
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439 (defun backward-sentence (&optional arg)
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440 "Move backward to start of sentence. With arg, do it arg times.
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441 See `forward-sentence' for more information."
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442 (interactive "_p") ; XEmacs
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443 (or arg (setq arg 1))
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444 (forward-sentence (- arg)))
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445
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446 (defun kill-sentence (&optional arg)
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447 "Kill from point to end of sentence.
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448 With arg, repeat; negative arg -N means kill back to Nth start of sentence."
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449 (interactive "*p") ; XEmacs
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450 (kill-region (point) (progn (forward-sentence arg) (point))))
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451
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452 (defun backward-kill-sentence (&optional arg)
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453 "Kill back from point to start of sentence.
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454 With arg, repeat, or kill forward to Nth end of sentence if negative arg -N."
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455 (interactive "*p") ; XEmacs
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456 (kill-region (point) (progn (backward-sentence arg) (point))))
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457
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458 (defun mark-end-of-sentence (arg)
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2549
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459 "Put mark at end of sentence. Arg works as in `forward-sentence'.
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460 If this command is repeated, it marks the next ARG sentences after the
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461 ones already marked."
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428
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462 (interactive "p")
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463 ;; FSF Version:
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2549
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464 ; (push-mark
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465 ; (save-excursion
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466 ; (if (and (eq last-command this-command) (mark t))
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467 ; (goto-char (mark)))
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468 ; (forward-sentence arg)
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469 ; (point))
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470 ; nil t))
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428
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471 (mark-something 'mark-end-of-sentence 'forward-sentence arg))
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472
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473 (defun mark-end-of-line (arg)
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474 "Put mark at end of line. Arg works as in `end-of-line'."
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475 (interactive "p")
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476 (mark-something 'mark-end-of-line 'end-of-line arg))
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477
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478 (defun transpose-sentences (arg)
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479 "Interchange this (next) and previous sentence."
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480 (interactive "*p")
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481 (transpose-subr 'forward-sentence arg))
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482
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2549
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483 ;;; Local Variables:
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484 ;;; coding: iso-2022-7bit
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485 ;;; End:
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486
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428
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487 ;;; paragraphs.el ends here
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