On 2013-02-12 1:37 AM, Robert O'Callahan wrote:
On Tue, Feb 12, 2013 at 6:32 PM, Zack Weinberg <za...@panix.com> wrote:
You want to do this as lazily as possible, since with high probability no
human will ever look at any given CSS error message. However, I would
still go for the "add source location information to every token" approach
in a greenfields design. It should be possible to make it be two machine
words per token: a pointer into the text of the entire style sheet, and a
line number. That's not bad compared to the data that already has to be
carried around for every token.
Couldn't you just make it a pointer into the text of the style sheet? Then
an auxiliary data structure could be used to quickly extract a line number
given such a pointer. (E.g. for each 256 byte boundary in the style sheet,
store the line number at that boundary.)
That's a cute idea. I had previously looked at and rejected the notion
of completely-lazy line numbering because some CSSOM objects expose
their source line number, but this sounds like a plausible way to split
the difference. Might even be worth doing in Gecko.
zw
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