How to get .m file definition programmatically?

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Travis Bueter
Travis Bueter 2023-2-20
回答： Image Analyst 2023-2-20
When looking at the Current Folder pane, the icons let you know if a m-file is a "script", "function", or "class" definition and if a .mlx is a "live script" or "live function". Is there any way to get that information programmatically using a built-in function?
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Steven Lord
Steven Lord 2023-2-20
my goal is to check if an arbritary .m file contains a class defintion, a function definition, or is a script.
How are you planning or hoping to use this information? What do you want to do differently depending on whether the file is a class file, a function file, a script file (and do you care if the script does or does not contain a local function?), or is not a MATLAB code file at all?
Travis Bueter
Travis Bueter 2023-2-20
编辑：Travis Bueter 2023-2-20
I am working to create a system to do a "health check" of our repositories that is performed by a CI system. Some of the checks include ensuring files are in the correct location (e.g. no scripts in certain folders, classes always in an @ folder when in a package, etc.) and other supplementary files exist (e.g. documentation, test files, etc.), which differ between classes and functions.
Currently I don't need to know if a script contains a local function.

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回答（2 个）

Sulaymon Eshkabilov
It is possible differentiate .m and .mlx files by referring to their file extensions or simlarly, Simulink's .mdl and .slx or slxc files by using a wildcard, e.g.
Sm = dir('*.m') % Locates all M-files in the current directory
Sm.name % Names of M-files
numel(Sm) % How many M-file
% Similarly, MLX-files
Smlx = dir('*.mlx')
Smlx.name
numel(Smlx)
% Similarly, SLX files
Sslx = dir('*.slx')
Sslx.name
numel(Sslx)
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Travis Bueter
Travis Bueter 2023-2-20
Thank you for your response! Distinguishing the files by their extension is not the problem I am looking to solve. I added a comment to help clarify what my goal is: https://www.mathworks.com/matlabcentral/answers/1915745-how-to-get-m-file-definition-programmatically#comment_2624560

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Image Analyst
Image Analyst 2023-2-20
Try using readlines then removing comments and see if the first line is classdef, function, or something else:
% Define filename.
fileName = 'testRGBImage.m';
% Read in all lines of a file.
allLines = readlines(fileName);
% Get rid of leading white space.
allLines = strtrim(allLines);
% Get rid of all lines that start with a comment.
c = startsWith(allLines, '%');
allLines(c) = [] % Delete lines starting with a comment.
% See if the first line of code is a classdef
itsAClass = contains(allLines{1}, 'classdef')
% See if the first line of code is a function declaration
itsAFunction = contains(allLines{1}, 'function')
% If it's not one of those, then it is a script (which may be followed by internal functions).
itsAScript = ~(itsAClass || itsAFunction)

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