Analysis methods for changing the execution language

Question

Looking at Rakudo Perl6 I wonder if there are methods for analysis and lexical analysis that allow you to change / expand the syntax of the language and are effective, and not difficult to implement.

Answer 1

"No". [edit: since the question] If the question is about lexing / parsing Perl, its quite complicated. We (see My biography for "we") have a Perl5 lexer. We have really good tools for working with lexer generators (Unicode, multi-state, regexps complete with the built-in "not regexp"). Perl lexer was a royal build headache; we ended up with something like 50 lexical modes (each with its own set of token definitions) for processing the lexical part.

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Answer 2

PEG. , PEG (http://en.wikipedia.org/wiki/Parsing_expression_grammar), , :

http://www.chrisseaton.com/katahdin/

http://www.meta-alternative.net/mbase.html

Perl5 Perl6- PEG ( , Perl6, , ).