How to robustly parse string into output arguments, function handle and input arguments

Question

Jori Selen 2021-6-11

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/853680-how-to-robustly-parse-string-into-output-arguments-function-handle-and-input-arguments

评论： Stephen23 2021-6-11

采纳的回答： Chunru

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In a textbox in a GUI, a user can enter a function that they wish to execute. For example,

[ out1, out2 ] = name_of_a_function(in1, in2, in3);

When submitted, this is communicated to the backend as the string

"[ out1, out2 ] = name_of_a_function(in1, in2, in3);"

Is there a robust way to decompose this string into the names of output arguments, function handle and input arguments taking into account that users can use any valid Matlab syntax and any number of output and input arguments, perhaps providing input arguments directly as vectors, matrices or cell arrays instead of using variable names?

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Stephen23 2021-6-11

"Is there a robust way to decompose this string..."

Not really. Read this discussion, including all of the comments:

https://www.mathworks.com/matlabcentral/answers/580671-can-a-function-known-whether-which-specific-output-is-ignored-tilde-operator

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Answer 1

Chunru 2021-6-11

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https://ww2.mathworks.cn/matlabcentral/answers/853680-how-to-robustly-parse-string-into-output-arguments-function-handle-and-input-arguments#answer_722460

在 MATLAB Online 中打开

It will be a challenging task. Hope the following can help

t =mtree('[ out1, out2 ] = name_of_a_function(in1, in2, in3);')
t =   mtree (complete: 13 nodes)
dumptree(t)
*<root>:  EXPR:   1/16 
   *Arg:  EQUALS:   1/16 
      *Left:  LB:   1/01 
         *Arg:  ID:   1/03  (out1)
         >Next:  ID:   1/09  (out2)
      *Right:  CALL:   1/36 
         *Left:  ID:   1/18  (name_of_a_function)
         *Right:  CALL:   1/37 
            *Left:  ID:   1/37  (in1)
         >Next:  CALL:   1/42 
            *Left:  ID:   1/42  (in2)
         >Next:  CALL:   1/47 
            *Left:  ID:   1/47  (in3)