readCommentHeader.m
b1a597dae131TekRSA-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)

			% Parameter-value pairs found in the comment header are added as extra
			% fields to this structure
			Info = struct( ...
			'comment_header', '', ...
			'first_code_line', '' ...
			);

			fid = fopen(file_name,'r');

			while ~feof(fid)
			str = fgetl(fid);

			trimstr = strtrim(str);
			if isempty(trimstr)

			% Do nothing for empty strings
			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});

			if ~ismember(tag, fieldnames(Info))

			% Remove leading and trailing whitespaces
			val = strtrim(match{1}{2});

			% Try converting to logical or double value
			if strcmpi(val, 'true')
			val = true;
			elseif strcmpi(val, 'false')
			val = false;
			else
			val = str2doubleHedged(val);
			end

			Info.ParamList.(tag) = val;
			end
			catch
			end
			else

			% Stop when the code begins
			Info.first_code_line = [str, newline];
			break
			end

			% Store the entire header
			Info.comment_header = [Info.comment_header, str, newline];
			end

			fclose(fid);
			end