How to implement isClassdef(filespec), isFunction(filespec) and isScript(filespec)?

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per isakson
per isakson 2016-11-20
编辑： per isakson 2016-11-21
I'm trying to implement
isClassdef(filespec)
isFunction(filespec)
isScript(filespec)
which take full filespecs as input and return true/false. I think that the code exists in Matlab because it's used to sort the files in "Current Folder", but I failed to find it.
The function, exist fails me for classes, which are defined in @-folders. It returns 2, whereas I expected 8.
>> which tree
h:\m\FEX\InUse\TreeDataStructure\@tree\tree.m % tree constructor
>> exist( 'tree' )
ans =
2
>> meta.class.fromName('tree')
ans =
class with properties:
Name: 'tree'
...
I try to avoid to read the files and search for key-words.
What's the best way?
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per isakson
per isakson 2016-11-21
编辑：per isakson 2016-11-21
@Walter, Examples in the documentation says so. See "P-Coding Files That Belong to a Package and/or Class" in http://uk.mathworks.com/help/matlab/ref/pcode.html. And I did it successfully with a tiny class.

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采纳的回答

Walter Roberson
Walter Roberson 2016-11-20
You can specifically check for class
exist('tree', 'class')
The 2 that you are getting back reflects that fact that there is a tree.m on your MATLAB path. It is the constructor for the tree class, and would be invoked if you called tree on something that did not otherwise dispatch tree.
To tell the difference between functions and scripts, you could use something like
is_a_function = false;
try
nargin(TheCandidateName);
is_a_function = true;
end
nargin() fails for scripts

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