[TxMt] Re: grammar feature request: exclude

[Matt Neuburg]

I should add that this list is repeated over and over in slight variations throughout the grammar. Thus, for example, double_literal does include all the inlines including #subscript, but not #single_literal or #double_literal. This is very hard to read and maintain, and it is easy to make a mistake. But I know in every case what I want to say in terms of "all of them, except for these few", so it would be really great to be able to _say_ that. m.

On Feb 9, 2014, at 8:08 PM, Matt Neuburg <matt at tidbits.com> wrote:

> Here's a list of includes from one of the inline patterns in the AsciiDoc grammar I'm writing:
> 
> 								{	include = '#double_bold'; },
> 								{	include = '#double_italic'; },
> 								{	include = '#double_literal'; },
> 								{	include = '#double_unquoted'; },
> 								{	include = '#double_quote'; },
> 								{	include = '#single_bold'; },
> 								{	include = '#single_italic'; },
> 								{	include = '#single_literal'; },
> 								{	include = '#single_literal_nopassthru'; },
> 								{	include = '#single_unquoted'; },
> 								{	include = '#superscript'; },
> 								{	include = '#characters'; },
> 
> But it happens that that list is almost the same as the #inline group I've already defined. I could reduce this to a single include! There's just one problem: we must not include ourselves, i.e. #subscript; we crash if we do, and anyway it's wrong (this pattern is not in any way recursive). Thus I request that the grammar should allow me to talk like this:
> 
> 								{	include = '#inline'; },
> 								{	exclude = '#subscript'; },
> 
> This is not just to make the list shorter; it also makes the list more correct and coherent, because I'm allowed to say (and see) exactly the truth: "include everything except yourself".
> 
> Thanks for thinking about this - m.
> 
> --
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--
matt neuburg, phd = matt at tidbits.com, http://www.apeth.net/matt/
pantes anthropoi tou eidenai oregontai phusei
Programming iOS 7! http://shop.oreilly.com/product/0636920031017.do
iOS 7 Fundamentals! http://shop.oreilly.com/product/0636920032465.do
RubyFrontier! http://www.apeth.com/RubyFrontierDocs/default.html
TidBITS, Mac news and reviews since 1990, http://www.tidbits.com