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annotate scripts/help/get_first_help_sentence.m @ 11270:5dd8e80fb6c1

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author John W. Eaton <jwe@octave.org>
date Thu, 18 Nov 2010 14:39:02 -0500
parents 2c356a35d7f5
children fd0a3ac60b0e
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1 ## Copyright (C) 2009 S�ren Hauberg
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2 ##
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3 ## This file is part of Octave.
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4 ##
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5 ## Octave is free software; you can redistribute it and/or modify it
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6 ## under the terms of the GNU General Public License as published by
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7 ## the Free Software Foundation; either version 3 of the License, or (at
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8 ## your option) any later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 ## General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public License
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16 ## along with Octave; see the file COPYING. If not, see
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17 ## <http://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {[@var{retval}, @var{status}] =} get_first_help_sentence (@var{name}, @var{max_len})
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21 ## Return the first sentence of a function help text.
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22 ##
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23 ## The function reads the first sentence of the help text of the function
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24 ## @var{name}. The first sentence is defined as the text after the function
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25 ## declaration until either the first period (".") or the first appearance of
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26 ## two consecutive end-lines ("\n\n"). The text is truncated to a maximum
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27 ## length
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28 ## of @var{max_len}, which defaults to 80.
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29 ##
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30 ## The optional output argument @var{status} returns the status reported by
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31 ## @code{makeinfo}. If only one output argument is requested, and @var{status}
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32 ## is non-zero, a warning is displayed.
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33 ##
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34 ## As an example, the first sentence of this help text is
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35 ##
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36 ## @example
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37 ## @group
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38 ## get_first_help_sentence ("get_first_help_sentence")
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39 ## @print{} ans = Return the first sentence of a function help text.
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40 ## @end group
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41 ## @end example
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42 ## @end deftypefn
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43
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44 function [retval, status] = get_first_help_sentence (name, max_len = 80)
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45 ## Check input
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46 if (nargin == 0)
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47 error ("get_first_help_sentence: not enough input arguments");
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48 endif
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49
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50 if (!ischar (name))
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51 error ("get_first_help_sentence: first input must be a string");
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52 endif
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53
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54 if (!isnumeric (max_len) || max_len <= 0 || max_len != round (max_len))
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55 error ("get_first_help_sentence: second input must be positive integer");
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56 endif
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57
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58 ## First, we get the raw help text
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59 [help_text, format] = get_help_text (name);
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60
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61 ## Then, we take action depending on the format
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62 switch (lower (format))
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63 case "plain text"
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64 [retval, status] = first_sentence_plain_text (help_text, max_len);
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65 case "texinfo"
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66 [retval, status] = first_sentence_texinfo (help_text, max_len);
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67 case "html"
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68 [retval, status] = first_sentence_html (help_text, max_len);
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69 case "not documented"
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70 error ("get_first_help_sentence: `%s' is not documented\n", name);
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71 case "not found"
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72 error ("get_first_help_sentence: `%s' not found\n", name);
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73 otherwise
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74 error ("get_first_help_sentence: internal error: unsupported help text format: '%s'\n", format);
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75 endswitch
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76
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77 if (nargout <= 1 && status != 0)
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78 warning ("get_first_help_sentence: couldn't run makeinfo on '%s'", name);
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79 endif
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80 endfunction
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81
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82 ## This function extracts the first sentence from a plain text help text
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83 function [retval, status] = first_sentence_plain_text (help_text, max_len)
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84 ## Extract first line by searching for a period or a double line-end.
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85 period_idx = find (help_text == ".", 1);
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86 line_end_idx = strfind (help_text, "\n\n");
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87 retval = help_text (1:min ([period_idx(:); line_end_idx(:); max_len; length(help_text)]));
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88 status = 0;
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89 endfunction
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90
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91 ## This function extracts the first sentence from a Texinfo help text.
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92 ## The function works by removing @def* from the texinfo text. After this, we
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93 ## render the text to plain text using makeinfo, and then extract the first line.
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94 function [retval, status] = first_sentence_texinfo (help_text, max_len)
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95 ## Lines ending with "@\n" are continuation lines, so they should be concatenated
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96 ## with the following line.
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97 help_text = strrep (help_text, "@\n", " ");
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98
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99 ## Find, and remove, lines that start with @def. This should remove things
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100 ## such as @deftypefn, @deftypefnx, @defvar, etc.
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101 keep = true (size (help_text));
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102 def_idx = strfind (help_text, "@def");
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103 if (!isempty (def_idx))
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104 endl_idx = find (help_text == "\n");
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105 for k = 1:length (def_idx)
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106 endl = endl_idx (find (endl_idx > def_idx (k), 1));
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107 if (isempty (endl))
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108 keep (def_idx (k):end) = false;
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109 else
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110 keep (def_idx (k):endl) = false;
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111 endif
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112 endfor
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113
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114 ## Remove the @end ... that corresponds to the @def we removed above
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115 def1 = def_idx (1);
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116 space_idx = find (help_text == " ");
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117 space_idx = space_idx (find (space_idx > def1, 1));
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118 bracket_idx = find (help_text == "{" | help_text == "}");
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119 bracket_idx = bracket_idx (find (bracket_idx > def1, 1));
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120 if (isempty (space_idx) && isempty (bracket_idx))
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121 error ("get_first_help_sentence: couldn't parse texinfo");
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122 endif
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123 sep_idx = min (space_idx, bracket_idx);
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124 def_type = help_text (def1+1:sep_idx-1);
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125
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126 end_idx = strfind (help_text, sprintf ("@end %s", def_type));
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127 if (isempty (end_idx))
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128 error ("get_first_help_sentence: couldn't parse texinfo");
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129 endif
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130 endl = endl_idx (find (endl_idx > end_idx, 1));
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131 if (isempty (endl))
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132 keep (end_idx:end) = false;
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133 else
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134 keep (end_idx:endl) = false;
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135 endif
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136
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137 help_text = help_text (keep);
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138 endif
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139
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140 ## Run makeinfo to generate plain text
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141 [help_text, status] = __makeinfo__ (help_text, "plain text");
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142
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143 ## Extract first line with plain text method.
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144 retval = first_sentence_plain_text (help_text, max_len);
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145 endfunction
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146
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147 ## This function extracts the first sentence from a html help text.
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148 ## The function simply removes the tags and treats the text as plain text.
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149 function [retval, status] = first_sentence_html (help_text, max_len)
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150 ## Strip tags
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151 [help_text, status] = strip_html_tags (help_text);
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152
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153 ## Extract first line with plain text method.
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154 retval = first_sentence_plain_text (help_text, max_len);
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155 endfunction
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156