Mercurial > octave-nkf
view scripts/help/get_first_help_sentence.m @ 20266:83792dd9bcc1
Use in-place operators in m-files where possible.
* scripts/audio/@audioplayer/set.m, scripts/audio/@audiorecorder/set.m,
scripts/audio/mu2lin.m, scripts/elfun/cosd.m, scripts/general/del2.m,
scripts/general/profexplore.m, scripts/general/quadl.m, scripts/general/rat.m,
scripts/general/rotdim.m, scripts/help/get_first_help_sentence.m,
scripts/help/private/__strip_html_tags__.m, scripts/image/cubehelix.m,
scripts/io/textread.m, scripts/linear-algebra/duplication_matrix.m,
scripts/linear-algebra/housh.m, scripts/linear-algebra/krylov.m,
scripts/linear-algebra/logm.m, scripts/linear-algebra/normest.m,
scripts/linear-algebra/onenormest.m, scripts/optimization/fminsearch.m,
scripts/optimization/lsqnonneg.m, scripts/optimization/qp.m,
scripts/plot/appearance/annotation.m, scripts/plot/appearance/axis.m,
scripts/plot/appearance/legend.m, scripts/plot/appearance/specular.m,
scripts/plot/draw/colorbar.m, scripts/plot/draw/hist.m,
scripts/plot/draw/plotmatrix.m, scripts/plot/draw/private/__stem__.m,
scripts/plot/util/__actual_axis_position__.m,
scripts/plot/util/__gnuplot_drawnow__.m, scripts/plot/util/findobj.m,
scripts/plot/util/print.m, scripts/plot/util/private/__go_draw_axes__.m,
scripts/plot/util/private/__print_parse_opts__.m, scripts/plot/util/rotate.m,
scripts/polynomial/pchip.m, scripts/polynomial/polyaffine.m,
scripts/polynomial/polyder.m, scripts/polynomial/private/__splinefit__.m,
scripts/polynomial/residue.m, scripts/signal/arch_fit.m,
scripts/signal/arch_rnd.m, scripts/signal/bartlett.m,
scripts/signal/blackman.m, scripts/signal/freqz.m, scripts/signal/hamming.m,
scripts/signal/hanning.m, scripts/signal/spectral_adf.m,
scripts/signal/spectral_xdf.m, scripts/signal/stft.m,
scripts/sparse/bicgstab.m, scripts/sparse/cgs.m,
scripts/sparse/private/__sprand_impl__.m, scripts/sparse/qmr.m,
scripts/sparse/sprandsym.m, scripts/sparse/svds.m, scripts/specfun/legendre.m,
scripts/special-matrix/gallery.m, scripts/statistics/base/gls.m,
scripts/statistics/models/logistic_regression.m,
scripts/statistics/tests/kruskal_wallis_test.m,
scripts/statistics/tests/manova.m, scripts/statistics/tests/wilcoxon_test.m,
scripts/time/datevec.m:
Use in-place operators in m-files where possible.
author | Rik <rik@octave.org> |
---|---|
date | Tue, 26 May 2015 21:07:42 -0700 |
parents | aa36fb998a4d |
children |
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## Copyright (C) 2009-2015 Søren Hauberg ## ## This file is part of Octave. ## ## Octave is free software; you can redistribute it and/or modify it ## under the terms of the GNU General Public License as published by ## the Free Software Foundation; either version 3 of the License, or (at ## your option) any later version. ## ## Octave is distributed in the hope that it will be useful, but ## WITHOUT ANY WARRANTY; without even the implied warranty of ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU ## General Public License for more details. ## ## You should have received a copy of the GNU General Public License ## along with Octave; see the file COPYING. If not, see ## <http://www.gnu.org/licenses/>. ## -*- texinfo -*- ## @deftypefn {Function File} {@var{text} =} get_first_help_sentence (@var{name}) ## @deftypefnx {Function File} {@var{text} =} get_first_help_sentence (@var{name}, @var{max_len}) ## @deftypefnx {Function File} {[@var{text}, @var{status}] =} get_first_help_sentence (@dots{}) ## Return the first sentence of a function's help text. ## ## The first sentence is defined as the text after the function declaration ## until either the first period (".") or the first appearance of two ## consecutive newlines ("\n\n"). The text is truncated to a maximum length of ## @var{max_len}, which defaults to 80. ## ## The optional output argument @var{status} returns the status reported by ## @code{makeinfo}. If only one output argument is requested, and @var{status} ## is nonzero, a warning is displayed. ## ## As an example, the first sentence of this help text is ## ## @example ## @group ## get_first_help_sentence ("get_first_help_sentence") ## @print{} ans = Return the first sentence of a function's help text. ## @end group ## @end example ## @end deftypefn function [text, status] = get_first_help_sentence (name, max_len = 80) ## Check input if (nargin < 1 || nargin > 2) print_usage (); endif if (! ischar (name)) error ("get_first_help_sentence: NAME must be a string"); endif if (! isnumeric (max_len) || max_len <= 0 || max_len != fix (max_len)) error ("get_first_help_sentence: MAX_LEN must be positive integer"); endif ## First, we get the raw help text [help_text, format] = get_help_text (name); ## Then, we take action depending on the format switch (lower (format)) case "plain text" [text, status] = first_sentence_plain_text (help_text, max_len); case "texinfo" [text, status] = first_sentence_texinfo (help_text, max_len); case "html" [text, status] = first_sentence_html (help_text, max_len); case "not documented" error ("get_first_help_sentence: '%s' is not documented\n", name); case "not found" error ("get_first_help_sentence: '%s' not found\n", name); otherwise error ("get_first_help_sentence: internal error: unsupported help text format: '%s'\n", format); endswitch if (nargout <= 1 && status != 0) warning ("get_first_help_sentence: couldn't run makeinfo on '%s'", name); endif endfunction ## This function extracts the first sentence from a plain text help text function [text, status] = first_sentence_plain_text (help_text, max_len) ## Extract first line by searching for a period followed by a space class ## character (to support periods in numbers or words) ... period_idx = regexp (help_text, '\.\s', "once"); ## ... or a double end-of-line (we subtract 1 because we are not interested ## in capturing the first newline). line_end_idx = regexp (help_text, "\n\n", "once") - 1; text = help_text (1:min ([period_idx; line_end_idx; max_len; length(help_text)])); status = 0; endfunction ## This function extracts the first sentence from a Texinfo help text. ## The function works by removing @def* from the texinfo text. After this, we ## render the text to plain text using makeinfo, and then extract the first ## line. function [text, status] = first_sentence_texinfo (help_text, max_len) ## Lines ending with "@\n" are continuation lines, so they should be ## concatenated with the following line. help_text = strrep (help_text, "@\n", " "); ## Find, and remove, lines that start with @def. This should remove things ## such as @deftypefn, @deftypefnx, @defvar, etc. keep = true (size (help_text)); def_idx = strfind (help_text, "@def"); if (! isempty (def_idx)) endl_idx = find (help_text == "\n"); for k = 1:length (def_idx) endl = endl_idx(find (endl_idx > def_idx(k), 1)); if (isempty (endl)) endl = numel (keep); endif keep(def_idx(k):endl) = false; endfor ## Remove the @end ... that corresponds to the @def we removed above def1 = def_idx(1); space_idx = find (help_text == " "); space_idx = space_idx(find (space_idx > def1, 1)); bracket_idx = find (help_text == "{" | help_text == "}"); bracket_idx = bracket_idx(find (bracket_idx > def1, 1)); if (isempty (space_idx) && isempty (bracket_idx)) error ("get_first_help_sentence: couldn't parse texinfo"); endif sep_idx = min (space_idx, bracket_idx); def_type = help_text(def1+1:sep_idx-1); end_idx = strfind (help_text, sprintf ("@end %s", def_type)); if (isempty (end_idx)) error ("get_first_help_sentence: couldn't parse texinfo"); endif keep(end_idx(1):end) = false; help_text = help_text(keep); endif ## Run makeinfo to generate plain text [help_text, status] = __makeinfo__ (help_text, "plain text"); ## Extract first line with plain text method. text = first_sentence_plain_text (help_text, max_len); endfunction ## This function extracts the first sentence from a html help text. ## The function simply removes the tags and treats the text as plain text. function [text, status] = first_sentence_html (help_text, max_len) ## Strip tags [help_text, status] = strip_html_tags (help_text); ## Extract first line with plain text method. text = first_sentence_plain_text (help_text, max_len); endfunction %!assert (get_first_help_sentence ('get_first_help_sentence'), ... %! "Return the first sentence of a function's help text.") ## Test input validation %!error get_first_help_sentence () %!error get_first_help_sentence (1, 2, 3) %!error <NAME must be a string> get_first_help_sentence (1) %!error <MAX_LEN must be positive integer> get_first_help_sentence ("ls", "a") %!error <MAX_LEN must be positive integer> get_first_help_sentence ("ls", 0) %!error <MAX_LEN must be positive integer> get_first_help_sentence ("ls", 80.1)