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Apparently that is "lexing", and parsing is making sure the tokens are in the allowed order

Yes. I am aware of that academical fine distinction. It is all fine and dandy in a nice, theoretical world of white-space delimited, single character tokens, but it doesn't cut it in the real world as far as I'm concerned.

In many -- arguably, even 'most' -- cases, it in not just a hell of a lot easier to work out where the next token ends if you know what (alternatives) you are expecting, it can be impossible to do so without said information.

And that means that the hand-written "lexer" you need to write in order to use a Marpa parser, has to effectively replicate the state machine that Marpa constructs.

At which point, what purpose does the parser serve?


With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

The start of some sanity?


In reply to Re^6: Block-structured language parsing using a Perl module? by BrowserUk
in thread Block-structured language parsing using a Perl module? by BrowserUk

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