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function [group, name, id] = ssget_lookup (matrix, ss_index)
%SSGET_LOOKUP gets the group, name, and id of a matrix.
% This is a helper function for ssget, sssvd, and ssweb.
% The 'matrix' argument is a number (matrix id) or string containing
% group/name, as in 'HB/arc130' for example.
%
% Example:
% [group name id] = ssget_lookup (matrix, ss_index)
%
% See also ssget.
% ssget, Copyright (c) 2009-2022, Timothy A. Davis. All Rights Reserved.
% SPDX-License-Identifier: BSD-3-clause
if (isnumeric (matrix))
% make sure that the matrix parameter is only one integer value
% this means that if we get an array, just use the first value
id = fix (full (matrix (1))) ;
% if the index is less than one or bigger than the length of the array,
% then no particular matrix is accessed
if (id > length (ss_index.nrows) | id < 1) %#ok
id = 0 ;
group = '' ;
name = '' ;
else
% assign the group and name for the given id
group = ss_index.Group {matrix} ;
name = ss_index.Name {matrix} ;
end
elseif (ischar (matrix))
% the group and matrix name are in the string as in GroupName/MatrixName
% find the group index for the file separator
% check both types of slashes, and a colon
gi = find (matrix == '/') ;
if (length (gi) == 0) %#ok
gi = find (matrix == '\') ;
end
if (length (gi) == 0) %#ok
gi = find (matrix == ':') ;
end
% if no name divider is in the string, a whole group is specified
if (length (gi) == 0) %#ok
id = 0 ;
group = matrix ;
name = '' ;
else
% group equals the first part of the string up to the character before
% the last file separator
group = matrix (1:gi(end)-1) ;
% group equals the last section of the string after the last file
% separator
name = matrix (gi(end)+1:end) ;
% validate the given name and group by checking the index for a match
% refName = strmatch (name, ss_index.Name) ;
% refGroup = strmatch (group, ss_index.Group) ;
% id = intersect (refName, refGroup) ;
refName = strcmp (name, ss_index.Name) ;
refGroup = strcmp (group, ss_index.Group) ;
id = find (refName & refGroup) ;
if (length (id) >= 1)
id = id (1) ;
else
% the given group/matrix does not exist in the index file
id = 0 ;
end
end
else
% there is an error in the argument types passed into the function
error ('invalid input') ;
end
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