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rINSTCONTROL/Utility functions/str2substruct.m
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str2substruct.m
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% Convert textual representation of a Matlab expression to structure that
% can be used by subsref and subsasgn functions
function [varname, S] = str2substruct(str)
% Match variable name
vn = '^(?<varname>\w+)'; % pattern for base variable name
name_re_out=regexp(str,vn,'match');
% Check that the variable name had single match
if length(name_re_out)==1
varname=name_re_out{1};
elseif length(name_re_out)>1
error('Multiple matches are found for variable name.')
else
error('No matches are found for variable name.')
end
% Next match references to structure fields (or class properties),
% array indices and cell indices
% Define pattern to find comma-separated integers, possibly
% surrounded by white spaces
csint = '(( *[0-9]+ *,)*( *[0-9]+ *))';
aind = ['(?<arrind>\(',csint,'\))']; % array index pattern
cind = ['(?<cellind>{',csint,'})']; % cell index pattern
fn = '(?<fieldname>\.\w+)'; % field name pattern
re_out=regexp(str,[fn,'|',aind,'|',cind],'names');
type_cell=cell(1,length(re_out));
subs_cell=cell(1,length(re_out));
for i=1:length(re_out)
if ~isempty(re_out(i).arrind)
type_cell{i}='()';
% Split, discarding the first and the last characters that are
% braces, and then convert to numbers.
char_ind=regexp(re_out(i).arrind(2:end-1),',','split');
subs_cell{i}=num2cell(str2double(char_ind));
elseif ~isempty(re_out(i).cellind)
type_cell{i}='{}';
% Split, discarding the first and the last characters that are
% braces, and then convert to numbers.
char_ind=regexp(re_out(i).cellind(2:end-1),',','split');
subs_cell{i}=num2cell(str2double(char_ind));
elseif ~isempty(re_out(i).fieldname)
type_cell{i}='.';
% remove '.' from the matched expression
subs_cell{i}=re_out(i).fieldname(2:end);
end
end
S=struct('type', type_cell, 'subs', subs_cell);
end
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