Parsing text without eval

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Nieves Lopez
Nieves Lopez on 21 Mar 2023
Commented: Nieves Lopez on 21 Mar 2023
I have some strings with values that I would like to parse. The easiest way is to use the eval function. However, I can not use it since the code is going to be compiled. Any idea on how to do this without having to parse each of the characters?
As an example, one of the string could be like this:
>> text = '{[1 2], [3 4] ''someText'' {5, [6, 7]}}'
text =
{[1 2], [3 4] 'someText' {5, [6, 7]}}
>> eval(text)
ans =
1×4 cell array
[1×2 double] [1×2 double] 'someText' {1×2 cell}
Thank you in advance!
Nieves Lopez
Nieves Lopez on 21 Mar 2023
Not so arbitrary code, only with numbers, strings, cells. No function calls. I was just wondering if I'm missing any function that can help me.

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Answers (2)

Adam Danz
Adam Danz on 21 Mar 2023
You could write the string to an m-file and then run the m-file, though this has the same flaws/risks as eval.
This demo creates a file temp.m, writes the string text to the file, runs the file, and then deletes the temporary file.
text = '{[1 2], [3 4] ''someText'' {5, [6, 7]}}'
tempFile = 'temp.m';
fid = fopen(tempFile,'w');
fidCleanup = onCleanup(@()fclose(fid));
clear fidCleanup
ans =
1×4 cell array
{[1 2]} {[3 4]} {'someText'} {1×2 cell}
Adam Danz
Adam Danz on 21 Mar 2023
Yeah, this wouldn't work outside of MATLAB. I missed that you were compiling your code.

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Image Analyst
Image Analyst on 21 Mar 2023


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