Parse Range Intersections Correctly

[SheetJSDev]

Cute website!

You are not properly parsing range intersections:

=SUM((A1:C3 B2:D4))

The formula is evaluated as =SUM((B2:C3))

If you want to see the formula building blocks, consult MS-XLS Ptg* records. XLS files don't store the string version of the formulas, which is why the formula spec is laid out. Relevant code block from js-xls: https://github.com/SheetJS/js-xls/blob/master/bits/68_fparse.js#L114-L337

[joshbtn]

Looking to make a more useful tool in general. The parsing logic pretty crude and the js conversion is a bit hacked together. I'll take a look! Thanks for the tip