readCommentHeader.m
2b4a002c8196TekRSA-Freq-vs-Time

readCommentHeader.m
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			% Read the header and first code line of a Matlab file, interpreting
			% 'property'='value' pairs indicated in comments
			function Info = readCommentHeader(file_name)
			Info = struct();
			Info.header = '';
			Info.first_code_line ='';
			try
			fid = fopen(file_name,'r');
			% Read the file line by line, with a paranoid limitation on
			% the number of cycles
			j = 1;
			while j<100000
			j=j+1;
			str = fgetl(fid);
			trimstr = strtrim(str);
			if isempty(trimstr)
			% An empty string
			elseif trimstr(1)=='%'
			% A comment string, try to extract the 'property'='value'
			% pair
			match = regexp(trimstr,'[%\s](\S)\s=(.)','tokens');
			try
			tag = lower(match{1}{1});
			% Tags can be anything, except for the protected values
			if ~isequal(tag, 'header') &&...
			~isequal(tag, 'first_code_line')
			% Remove leading and trailing whitespaces with strtrim
			Info.(tag) = strtrim(match{1}{2});
			end
			catch
			end
			else
			% Stop when the code begins
			Info.first_code_line = [str, newline];
			break
			end
			% Also store the header in its entirety
			Info.header = [Info.header, str, newline];
			end
			fclose(fid);
			catch
			warning('Could not read the file header of %s', file_name)
			end
			end