Re: Best language for implementing compilers?

From	Kaz Kylheku <157-073-9834@kylheku.com>
Newsgroups	comp.compilers
Subject	Re: Best language for implementing compilers?
Date	2019-03-10 05:48 +0000
Organization	Aioe.org NNTP Server
Message-ID	<19-03-008@comp.compilers> (permalink)
References	<19-02-002@comp.compilers> <19-02-004@comp.compilers> <19-02-006@comp.compilers> <19-03-002@comp.compilers> <19-03-006@comp.compilers>

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On 2019-03-10, George Neuner <gneuner2@comcast.net> wrote:
> On Sat, 9 Mar 2019 01:47:38 -0500 (EST), mertesthomas@gmail.com wrote:
>
>>For parsing I don't think that pattern matching leads to correct
>>results in all cases. I have seen too much buggy attempts to do
>>parsing with pattern matching.
>
> You have seen the approach of bad patterns - you have not seen that
> patterns are a bad approach.
>
> I also have seen some poor attempts made using pattern matching - when
> the patterns are too general, or don't cover 100% the intended cases -
> there will be unintended matches.  Pattern matching is only as

Sometimes unintended matches are better; you can deal with the
over-match easily later in the pipeline.

Lisp is a good example: any possible tree shape, containing any symbols,
can be scanned into a tree. Then macros and operators check for invalid
syntax.

In C, any combination of type specifiers and qualifiers can occur in a
declaration. For instance the simple grammar will match
"long char unsigned short int double".

Enforcing the permissible combinations is a constraint check.

The valid combinations can occur in any order: unsigned long int, int
long unsigned, ...

It would be a fool's errand to write phrase structure rules to match the
valid combinations and not match invalid ones.

Thread

Best language for implementing compilers? "Costello, Roger L." <costello@mitre.org> - 2019-02-08 12:20 +0000
  Re: Best language for implementing compilers? Nala Ginrut <nalaginrut@gmail.com> - 2019-02-09 00:27 +0800
  Re: Best language for implementing compilers? George Neuner <gneuner2@comcast.net> - 2019-02-08 18:36 -0500
    Re: Best language for implementing compilers? Bart <bc@freeuk.com> - 2019-02-11 12:59 +0000
      Re: Best language for implementing compilers? drb@ihatespam.msu.edu (Dennis Boone) - 2019-02-12 09:38 -0600
        Re: Best language for implementing compilers? drb@ihatespam.msu.edu (Dennis Boone) - 2019-02-19 11:22 -0500
          Re: Best language for implementing compilers? arnold@skeeve.com (Aharon Robbins) - 2019-02-20 11:48 +0000
      Re: Best language for implementing compilers? Kaz Kylheku <157-073-9834@kylheku.com> - 2019-02-12 16:45 +0000
      Re: Best language for implementing compilers? mertesthomas@gmail.com - 2019-03-09 01:47 -0500
        Re: Best language for implementing compilers? Hans-Peter Diettrich <DrDiettrich1@netscape.net> - 2019-03-09 10:14 +0100
          Re: Best language for implementing compilers? George Neuner <gneuner2@comcast.net> - 2019-03-09 22:47 -0500
          Re: Best language for implementing compilers? Kaz Kylheku <157-073-9834@kylheku.com> - 2019-03-10 05:40 +0000
        Re: Best language for implementing compilers? Bart <bc@freeuk.com> - 2019-03-09 12:34 +0000
        Re: Best language for implementing compilers? George Neuner <gneuner2@comcast.net> - 2019-03-09 22:57 -0500
          Re: Best language for implementing compilers? Kaz Kylheku <157-073-9834@kylheku.com> - 2019-03-10 05:48 +0000
      Re: Best language for implementing compilers? Christopher F Clark <christopher.f.clark@compiler-resources.com> - 2019-03-10 04:13 -0700
        Re: Best language for implementing compilers? Bart <bc@freeuk.com> - 2019-03-10 15:33 +0000
          Re: Best language for implementing compilers? Christopher F Clark <christopher.f.clark@compiler-resources.com> - 2019-03-11 10:49 -0700
            Re: Best language for implementing compilers? Hans-Peter Diettrich <DrDiettrich1@netscape.net> - 2019-03-12 06:54 +0100
              Re: Best language for implementing compilers? Bart <bc@freeuk.com> - 2019-03-13 01:50 +0000
        Re: Best language for implementing compilers? Hans-Peter Diettrich <DrDiettrich1@netscape.net> - 2019-03-10 16:13 +0100
          Re: Best language for implementing compilers? Christopher F Clark <christopher.f.clark@compiler-resources.com> - 2019-03-11 10:06 -0700
        Re: Best language for implementing compilers? George Neuner <gneuner2@comcast.net> - 2019-03-10 18:23 -0400
        Re: Best language for implementing compilers? George Neuner <gneuner2@comcast.net> - 2019-03-10 18:58 -0400
  Re: Best language for implementing compilers? "Robin Vowels" <robin51@dodo.com.au> - 2019-02-09 19:58 +1100
  Best language for implementing compilers? David Lovemore <davidlovemore@gmail.com> - 2019-02-12 03:28 -0800
  Re: Best language for implementing compilers? mertesthomas@gmail.com - 2019-03-12 10:40 -0700

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