Subject: Re: [xsl] Are XPath expressions parsed using compiler parsing techniques? From: "Michael Kay mike@xxxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> Date: Sun, 8 May 2022 23:10:27 -0000 |
> > Are XPath expressions parsed using compiler parsing algorithms? > Yes, of course, how else would you do it? If you want to know more, I'm hoping to have a paper on the subject at XML Prague next month. But if you're interested in this kind of thing, there's a fair bit in my blog over the years: see https://dev.saxonica.com/blog/mike/ (Incidentally, there's one little XPath parsing trick that's quite amusing. It turns out that about one in three XPath expressions (especially in XSLT) contains 4 tokens or less, and you can get a saving by just recognising the common patterns of tokens: if it's "@" followed by a QName, you can recognize that as a known pattern and emit the corresponding syntax tree without doing full parsing at all). Michael Kay
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