[TxMt] Defining grammars to select entire functions?

[Michael Manti]

Hi,

I'm developing a bundle for Stata/Mata, and I want to define a  
grammar such that Ctrl-Alt-B can select an entire function. I would  
appreciate any pointers.

Here's an example function:

real matrix y_null(real scalar rho, real scalar T) {
	real matrix y
	real colvector e
	real scalar t
	y = J(T, 2, 0)
	// use the inverse CDF method to draw from N(0, 1)	
	e = invnormal(uniform(T, 1))
	y[1, 2] = (1 - rho^2) * invnormal(uniform(1, 1))[1, 1]
	for (t = 1; t < T; t++) {
		y[t, 1] = rho :* y[t, 2] + e[t]
		y[(t+1), 2] = y[t, 1]
	}
	y[T, 1] = rho :* y[T, 2] + e[T]
	return(y)
}

And here are the relevant excerpts from the grammar:

	patterns = (
		{	name = 'meta.function.mata';
			begin = '(?x)
                      (?=
                      ^\s*
                      ((transmorphic|numeric|real|complex|string| 
pointer)\s+)? # eltype
      				 ((matrix|vector|colvector|rowvector|scalar)\s+)?         #  
orgtype
                      (\w+)\(.*\)\s 
+                                           # function name
                      \{$
                      )';
			end = '(?<=^\}$)';
			beginCaptures = { 5 = { name = 'entity.name.function.mata'; }; };
			patterns = ( { include = '#base'; } );
		},
		{	include = '#base'; },
	);

	repository = {
		base = {
			patterns = (

...

				{	name = 'storage.type.eltype.mata';
					match = '\b(transmorphic|numeric|real|complex|string|pointer)\b';
				},
...
			);



Now, in most regards, this works fine. The name of the  
function--"y_null"--shows up in the symbol list, and the contained  
scopes are identified correctly. Also if I cycle through Ctrl-Alt-B  
when the cursor is not on "real" or at the beginning of the line, the  
whole function is selected. However, if I hit Ctrl-Alt-B either at  
the beginning of the first line or within "real", it fails to  
recognize the meta.function.mata scope. That is, on the first  
keypress, TextMate recognizes the storage.type.eltype.mata scope and  
selects "real", but on the second, it skips right to the source.mata  
scope and selects the whole program instead of just the function.

Here are the results from Ctrl-Shift-P:

With cursor at the beginning of "real"/beginning of line --  
source.mata, meta.function.mata, storage.type.eltype.mata
With cursor within "real" -- source.mata, meta.function.mata,  
storage.type.eltype.mata
With cursor anywhere else in the function body -- source.mata,  
meta.function.mata, other scopes from the base repository if relevant
With "real" selected (by Ctrl-Alt-B or manually) -- source.mata

Any ideas on how to workaround this? It's annoying, because if you  
navigate to a function via the symbol list, it puts the cursor at the  
beginning of the line by default.

Thanks!

Michael



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