- From: Tab Atkins Jr. <jackalmage@gmail.com>
- Date: Tue, 4 Feb 2014 11:26:31 -0800
- To: Javier Fernandez <jfernandez@igalia.com>
- Cc: www-style list <www-style@w3.org>
On Mon, Feb 3, 2014 at 11:56 AM, Javier Fernandez <jfernandez@igalia.com> wrote: > Hi, > > I'm trying to implement the "template-grid" shorthand following the > latest specification, but I'm having some problems trying to understand > the last syntax form: > > [ <track-list> / ]? [ <line-names>? <string> [ <track-size> <line-names> > ]? ]+ > > The description of the last component, " [ <track-size> <line-names> ]? > ", indicates the following: > > * Sets "grid-template-rows" to the <track-size>s following each string > (filling in auto for any missing sizes), and splicing in the named lines > defined before/after each size. > > First question is, wouldn't be necessary, or clearer, to add an "OR" to > such clause ? perhaps something like " [ <track-size> | <line-names> > ]? " ? or does the original clause mean that any of the elements inside > the [] are optional ? Ah, that is a mistake. Instead of having brackets around them and making the pair optional, each one should be optional by itself, like "<track-size>? <line-names>?". > Also, wouldn't be clearer to define this shorthand in a way more > consistent with the track-list definition, so as the track-size would be > mandatory ? I don't think so. An omitted track size is just "auto", which seems pretty reasonable. > I have some other doubts on the use of brackets, for instance, in the > "grid-line" syntax definition: > > <grid-line> = > auto | > <custom-ident> | > [ <integer> && <custom-ident>? ] | > [ span && [ <integer> || <custom-ident> ] ] > > In that case," [ <integer> && <custom-ident>? ] " wouldn't be clearer " > [<integer> [&& <custom-ident>] " I don't understand. Your suggested correction isn't well-formed. ~TJ
Received on Tuesday, 4 February 2014 19:27:33 UTC