charmoniumQ / antlr-matlab-grammar

An ANTLR4 grammar for MATLAB

MatlabAntlrGrammar

An ANTLR4 grammar for MATLAB

Antlr Notes

• * matches zero or more repetitions
• + matches one or more repetitions
• ? matches zero or one

Using ANTLR MATLAB Grammar in MATLAB

We need to add ANTLR and generated CLASS files to the MATLAB Java static path. Adding to dynamic path doesn't work. Once everything is added to the path, we can run the ANTLR TestRig from the MATLAB command prompt.

>> testRig = org.antlr.v4.gui.TestRig({'MATLAB' 'matlab_file' '-tree' 'startup.m'})
>> testRig.process()
(matlab_file (statement (assignment (lvalue (variable paths)) = (expression (cell { (expression_list (expression (lvalue (variable pwd))) , (expression 'D:\Source\BitBucket\vinodkhare\MATLAB-PEP') , (expression 'D:\Source\BitBucket\vinodkhare\MATLAB-Javelin')) }))) ;) (statement (for_statement for 
... more output

Since the output above is being generated on stdout but Java, we can't capture it into a MATLAB variable. The workaround here is to use the MATLAB diary function. This writes the command line output to a text file called diary in the current folder.

Ranges in MATLAB

Ranges in MATLAB can be written in the following forms

• : - a simple color indicates the 'all' range.
• end - indicates the last element of the array.
• A - a single expression A
• A:B - indicates a range from A to B, where A and B are any expression including end. Floats are accepted, they are incremented by 1.0. E.g. 2.3:4.5 evaluates to [2.3000 3.3000 4.3000].
• A:S:B - indicates a range with a user specified step.