以编程方式区分脚本和函数 [英] Distinguish between scripts and functions programmatically

问题描述

给定一个文件名，如何在MATLAB中以编程方式区分脚本和函数？

如果我试图将一个参数传递给脚本，我得到尝试执行SCRIPT somescript作为函数：。有没有办法检测到这一点，而不尝试执行它？

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更新：由于@ Craq指出，在发布这个问题后不久，有一篇关于MATLAB Central的文章： http://blogs.mathworks.com/loren/2013/08/26/what-kind-of-matlab-file-is-this/

解决方案

没有找到干净的解决方案，但可以使用 try-catch （如@Ilya建议）和 nargin

编辑 - 使用函数来避免一些命名冲突;使用 exists 来进一步对输入进行分类（例如MEX文件）

 函数is_script = is_a_script（varargin）
％is_a_script（varargin）返回以下内容之一：
％1：如果输入是脚本
％0：如果输入是函数
％-1：如果输入既不是函数也不是脚本。 
 
 is_script = 0; 
 switch（exists（varargin {1}））
 case 2 
％如果输入不是MEX或DLL或MDL或内建或P文件或变量或类或文件夹，
％then exists（）返回2 
尝试
 nargin（varargin {1}）; 
 catch err 
％如果nargin引发错误并且错误消息与脚本的特定错误消息不匹配，则输入既不是脚本也不是函数。 
 if（strcmp（err.message，sprintf（'％s is a script。'，varargin {1}）））
 is_script = 1; 
 else 
 is_script = -1; 
 end 
 end 
 case {3,4,5,6}％MEX或DLL文件，MDL文件，内置P文件
％我不是熟悉DLL文件/ MDL文件/ P文件。我假设他们都被视为功能。 
 is_script = 0; 
否则％Variable，Folder，Class或其他情况
 is_script = -1; 
 end 
  

Given a file name, how can I programmatically distinguish between scripts and functions in MATLAB?

If I attempt to pass an argument to a script, I get Attempt to execute SCRIPT somescript as a function:. Is there a way to detect this without attempting to execute it?

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Update: As @craq pointed out, shortly after this question was posted, there was an article about this on MATLAB Central: http://blogs.mathworks.com/loren/2013/08/26/what-kind-of-matlab-file-is-this/

解决方案

Didn't find a clean solution, but you can probably use try-catch (as @Ilya suggested) and nargin

EDIT - Use function to avoid some naming conflict; use exist to further classify the input (e.g. MEX-file)

function is_script = is_a_script( varargin )
% is_a_script( varargin ) returns one of the following:
%   1: if the input is a script
%   0: if the input is a function
%  -1: if the input is neither a function nor a script.

is_script = 0;
switch( exist(varargin{1}) )
    case 2
        % If the input is not a MEX or DLL or MDL or build-in or P-file or variable or class or folder,
        % then exist() returns 2
        try
            nargin(varargin{1});
        catch err
            % If nargin throws an error and the error message does not match the specific one for script, then the input is neither script nor function.
            if( strcmp( err.message, sprintf('%s is a script.',varargin{1}) ) )
                is_script = 1;
            else
                is_script = -1;
            end
        end
    case {3, 4, 5, 6} % MEX or DLL-file, MDL-file, Built-in, P-file
        % I am not familiar with DLL-file/MDL-file/P-file. I assume they are all considered as functions.
        is_script = 0;
    otherwise % Variable, Folder, Class, or other cases 
        is_script = -1;
end

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