[e-lang] XML support in E

[Mark Miller]

On Fri, Jan 15, 2010 at 4:47 AM, Kevin Reid <kpreid at mac.com> wrote:

> On Jan 15, 2010, at 6:12, Thomas Leonard wrote:
> > OK, I can create JSON documents easily enough using
> >
> > def Term := <type:org.quasiliteral.term.Term>
> > def serialised := (testData :Term).asText()
> >
> > This is nice and fast, and I assume it could produce XML in a
> > similar way.
>
> Huh, I didn't know that worked except for leaf types. (I find that the
> relevant code is in
> org.erights.e.meta.org.quasiliteral.astro.AstroGuardSugar.)
>
>
Yes. The first test case at src/jsrc/org/quasiliteral/term/Term.updoc is

    ? [3=>4, "a"=>'x', [2,3]=>[4,5]]:Term
    # value: term`{3: 4,
    #              "a": 'x',
    #              [2, 3]:
    #                  [4, 5]}`

which exercises some of the interesting cases.



> > I can turn the serialised string back into a term like this:
> >
> > def TermParserMaker := <import:org.quasiliteral.term.makeTermParser>
> > TermParserMaker(serialised)
> >
> > But how do I turn that term back into the E data-structure (i.e.
> > reverse the effect of :Term)?
>
> I don't know of a facility to do this. (deJSONKit does so the long way
> around.) MarkM?
>
> For leaf data terms, their __conformTo already knows how to auto-coerce to
their primitive data value.

Kevin, regarding non-leaf terms, I recall you once wrote such a guard as an
experiment, but I don't think we ever added it to the E library. As I
recall, at the time you may have called it Termish. But that conflicts with
a different use of that name in the org.quasiliteral.term package. I may be
misremembering.




> --
> Kevin Reid                                  <http://switchb.org/kpreid/>
>
>
>
>
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-- 
Text by me above is hereby placed in the public domain

   Cheers,
   --MarkM
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