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Re: How do you create a grammar for a multi-language language?

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On Sunday, March 6, 2022 at 9:06:34 AM UTC-8, Christopher F Clark wrote:

(snip)

> However, you are actually solving a "simpler" problem. And, the
> standard approach to that is to embed the second language as a
> "string" in the outer language. Many languages (and their
> compilers/interpreters) do that. That's exactly what your XSLT case
> does. The XPATH code is simply a string in the XSLT language, and the
> XSLT language doesn't attempt to parse it. It simply hands the code
> off to an XPATH parser when in knows the string is XPATH code.

That works when the outer language is parsed first.

For PHP, and I believe the C preprocessor, the inner language is parsed
first, so the parser has to ignore everything, including quoting, in
the outer language.

I don't believe I ever tried preprocessor statements inside C string
constants, but as far as I know, it works.

One has to be careful to avoid ambiguities between the two,
or are created with the combination of the two languages.
[PHP effectively treats material between ?> and <?php as an instruction
to print the material as if it were a quoted string.

C says that the input is tokenized before it does the preprocessor
phase, so it does not look inside quoted strings. The # and ##
preprocessor operators allow some preprocessor time creation of quoted
strings. -John]

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How do you create a grammar for a multi-language language? Roger L Costello <costello@mitre.org> - 2022-03-03 13:57 +0000
  Re: How do you create a grammar for a multi-language language? Roger L Costello <costello@mitre.org> - 2022-03-05 22:29 +0000
    Re: How do you create a grammar for a multi-language language? "Kartik Agaram" <ak@akkartik.com> - 2022-03-05 16:55 -0800
    RE: How do you create a grammar for a multi-language language? Christopher F Clark <christopher.f.clark@compiler-resources.com> - 2022-03-06 15:37 +0200
      Re: How do you create a grammar for a multi-language language? gah4 <gah4@u.washington.edu> - 2022-03-06 14:36 -0800
        Re: How do you create a grammar for a multi-language language? gah4 <gah4@u.washington.edu> - 2022-03-06 16:50 -0800
      RE: How do you create a grammar for a multi-language language? Roger L Costello <costello@mitre.org> - 2022-03-06 23:32 +0000
  Re: How do you create a grammar for a multi-language language? gah4 <gah4@u.washington.edu> - 2022-03-05 21:10 -0800
    Re: How do you create a grammar for a multi-language language? "Robin Vowels" <robin51@dodo.com.au> - 2022-03-07 13:39 +1100
  Re: How do you create a grammar for a multi-language language? Hans-Peter Diettrich <DrDiettrich1@netscape.net> - 2022-03-06 12:23 +0100
    Re: How do you create a grammar for a multi-language language? Hans-Peter Diettrich <DrDiettrich1@netscape.net> - 2022-03-07 05:08 +0100
      Re: How do you create a grammar for a multi-language language? gah4 <gah4@u.washington.edu> - 2022-03-06 21:22 -0800
        Keywords and Reserved Words Christopher F Clark <christopher.f.clark@compiler-resources.com> - 2022-03-08 21:46 +0200
          Re: Keywords and Reserved Words gah4 <gah4@u.washington.edu> - 2022-03-09 00:31 -0800
            Re: Keywords and Reserved Words "Robin Vowels" <robin51@dodo.com.au> - 2022-03-10 10:00 +1100
          Re: Keywords and Reserved Words "Robin Vowels" <robin51@dodo.com.au> - 2022-03-10 09:55 +1100
            Re: Keywords and Reserved Words in Fortran Thomas Koenig <tkoenig@netcologne.de> - 2022-03-10 07:07 +0000
          Re: Keywords and Reserved Words "Robin Vowels" <robin51@dodo.com.au> - 2022-03-10 11:59 +1100

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