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rINSTCONTROL/Utility functions/str2substruct.m
455a695a37a6TekRSA-Freq-vs-Time

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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 [S, varname] = str2substruct(str)
% Define patterns to match the variable name and subscript references,
% i.e. structure fields, array indices and cell indices
vn = '^(?<varname>[a-zA-Z]\w*)?'; % pattern for variable name
% Expresion always returns one and only one match, which might be empty
[re_tokens, re_rem]=regexp(str,vn,'tokens','split','once','emptymatch');
varname=re_tokens{1};
str=re_rem{2};
% Pattern to find comma-separated integers, possibly
% surrounded by white spaces, which represent array indices
csint = '(( *[:0-9]+ *,)*( *[:0-9]+ *))';
% Define patterns to match subscript references, i.e. structure fields,
% array indices and cell indices
aind = ['\((?<arrind>',csint,')\)']; % regular array index pattern
cind = ['{(?<cellind>',csint,')}']; % cell array index pattern
fn = '\.(?<fieldname>\w+)'; % field name pattern
[re_tokens, re_rem] = regexp(str, ...
[fn,'|',aind,'|',cind],'names','split','emptymatch');
% Check that the unmatched remainder of the expression is empty,
% i.e. that the expression has a proper format
assert(all(cellfun(@(x)isempty(x),re_rem)), ['Expression ''',str,...
''' is not a valid subscript reference.']);
type_cell=cell(1,length(re_tokens)-1);
subs_cell=cell(1,length(re_tokens)-1);
for i=1:length(re_tokens)
if ~isempty(re_tokens(i).arrind)
type_cell{i}='()';
% Split and convert indices to numbers.
char_ind=regexp(re_tokens(i).arrind,',','split');
subs_cell{i}=str2doubleHedged(char_ind);
elseif ~isempty(re_tokens(i).cellind)
type_cell{i}='{}';
% Split and convert indices to numbers.
char_ind=regexp(re_tokens(i).cellind,',','split');
subs_cell{i}=str2doubleHedged(char_ind);
elseif ~isempty(re_tokens(i).fieldname)
type_cell{i}='.';
subs_cell{i}=re_tokens(i).fieldname;
end
end
S=struct('type', type_cell, 'subs', subs_cell);
end
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