Subject: Re: [xsl] XSLT compiler and syntax extensions From: COUTHURES Alain <alain.couthures@xxxxxxxxxxxxx> Date: Thu, 18 Nov 2010 12:53:55 +0100 |
Alain Couthures <agenceXML>
You're right of course - this is how compilers get bootstrapped. You write a compiler in XSLT 2.0 that compiles XSLT 2.0 stylesheets into XSLT 1.0 stylesheets, then you use an existing XSLT 2.0 processor to compile this compiler into XSLT 1.0, and then you have a compiler that's written in XSLT 1.0 and can execute in browsers. Easy really. Except for the data model issues!
Michael Kay Saxonica
On 18/11/2010 10:29, Emmanuel Bigui wrote:On Thu, Nov 18, 2010 at 1:45 AM, Brandon Ibach <brandon.ibach@xxxxxxxxxxxxxxxxxxx> wrote:The recent mention of an XSLT optimizer reminded me of a project I've been working on, here and there, for the last year or two. It's an XSLT compiler, by which I mean a pure XSLT 1.0 stylesheet (using no extensions) that can take a stylesheet using certain XSLT 2.0 features (and some other extensions) and "compile" it into a pure XSLT 1.0 stylesheet. Both the compiler and its output should be able to run in any XSLT 1.0 compliant engine.
While I understand that it's interesting to have a compiler that would run in a pure XSLT 1.0 processor, would it not be also useful, and much easier, to write the compiler in XSTL 2.0? (or, actually, in any language...)
The need is to be able to write XSLT 2.0 stylesheets and have them run in a 1.0 processor; I'm not sure the fact that they run "as is", ie, that the compiling happens "on the fly" in the production environment, is the same level of priority.
If I can write an XSLT 2.0 stylesheet, test it in an XSLT 2.0 processor, and then be guaranteed the same result when compiled in 1.0 and run in a pure 1.0 processor, then the extra compiling step (that can be part of the development process) does not seem like a great impediment?
Regards, EB
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