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function [idx, nelem, subs, mask] = df_name2idx(names, subs, count, dimname, missingOK);
%# This is a helper routine to translate rownames or columnames into
%# real index. Input: names, a char array, and subs, a cell array as
%# produced by subsref and similar. This routine can also detect
%# ranges, two values separated by ':'. On output, subs is
%# 'sanitised' from names, and is either a vector, either a single ':'
%% Copyright (C) 2009-2017 Pascal Dupuis <cdemills@gmail.com>
%%
%% This file is part of the dataframe package for Octave.
%%
%% This package 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 2, or (at your option) any later version.
%%
%% This package 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 this package; see the file COPYING. If not,
%% see <http://www.gnu.org/licenses/>.
if (nargin < 5) missingOK = false; end
%# regexp idea of 'word boundary' changed between 3.6 and 3.7
persistent wbs wbe;
if (isempty (wbs))
if (isempty ( regexp ('This is a test', '\<is\>')))
[wbs, wbe] = deal ('\b');
else
wbs = '\<'; wbe = '\>';
end
end
if (isempty (subs))
%# not caring about rownames ? Avoid generating an error.
idx = []; nelem = 0; return
end
if (~isa (dimname, 'char'))
switch dimname
case 1
dimname = 'row';
case 2
dimname = 'column';
case 3
dimname = 'page';
otherwise
error ('Unknown dimension %d', dimname);
end
end
if (isa (subs, 'char')),
orig_name = subs;
if (1 == size (subs, 1))
if (strcmp(subs, ':')) %# range operator
idx = 1:count; nelem = count;
return
end
end
subs = cellstr (subs);
else
if (~isvector(subs))
%# yes/no ?
%# error('Trying to access column as a matrix');
end
switch (class (subs))
case {'cell'}
orig_name = char (subs);
case {'dataframe'}
orig_name = 'elements indexed by a dataframe';
otherwise
orig_name = num2str (subs);
end
end
if (isa (subs, 'cell'))
subs = subs(:); idx = []; mask = logical (zeros (size (subs, 1), 1));
%# translate list of variables to list of indices
for indi = (1:size (subs, 1))
%# regexp doesn't like empty patterns
if (isempty (subs{indi})) continue; end
%# convert from standard pattern to regexp pattern
subs{indi} = regexprep (subs{indi}, '([^\.\\])(\*|\?)', '$1.$2');
%# quote repetition ops at begining of line, otherwise the regexp
%# will stall forever/fail
subs{indi} = regexprep (subs{indi}, ...
'^([\*\+\?\{\}\|])', '\\$1');
%# detect | followed by EOL
subs{indi} = regexprep (subs{indi}, '([^\\])\|$', '$1\\|');
if (0 == index (subs{indi}, ':'))
%# if there's no special operator, make match strict
if (isempty (regexp (subs{indi}, '[\.\*\+\?\{\}\(\)\[\]\^\$\\]')))
subs{indi} = [wbs subs{indi} wbe];
end
for indj = (1:min (length (names), count)) %# sanity check
if (~isempty (regexp (names{indj}, subs{indi})))
idx = [idx indj]; mask(indi) = true; dummy = true;
end
end
else
dummy = strsplit (subs{indi}, ':');
ind_start = 1;
if (~isempty (dummy{1}))
ind_start = sscanf (dummy{1}, '%d');
if (isempty (ind_start))
ind_start = 1;
for indj = (1:min(length (names), count)) %# sanity check
if (~isempty (regexp (names{indj}, subs{indi}))),
ind_start = indj; break; %# stop at the first match
end
end
end
end
if (isempty (dummy{2}) || strcmp (dummy{2}, 'end'))
ind_stop = count;
else
ind_stop = sscanf(dummy{2}, '%d');
if (isempty (ind_stop))
ind_stop = 1;
for indj = (min (length (names), count):-1:1) %# sanity check
if (~isempty (regexp (names{indj}, subs{indi})))
ind_stop = indj; break; %# stop at the last match
end
end
end
end
idx = [idx ind_start:ind_stop];
end
end
if (isempty (idx) && ~missingOK)
dummy = sprintf ('Unknown %s name while searching for %s', ...
dimname, orig_name);
error (dummy);
end
elseif (isa (subs, 'logical'))
idx = 1:length (subs(:)); idx = reshape (idx, size (subs));
idx(~subs) = []; mask = subs;
elseif (isa (subs, 'dataframe'))
idx = subsindex (subs, 1);
else
idx = subs;
end
subs = idx;
nelem = length (idx);
end
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