use Grammar::Debugger::WrapCache;
use Terminal::ANSIColor;



head

Grammer::Tracer - non-interactive debugger for Perl 6 grammars


In the file that has your grammar definition, merely load the module
in the same lexical scope:


L<Grammar::Tracer> is the non-interactive version of L<Grammar::Debugger>.
It runs through the entire grammar without stopping.


Jonathan Worthington, C<< <jnthn@jnthn.net> >>



my class TracedGrammarHOW is Metamodel::GrammarHOW does Grammar::Debugger::WrapCache {
    my $indent = 0;

    method find_method($obj, $name) {
        my \cached = %!cache{$name};
        return cached if cached.DEFINITE;
        my $meth := callsame;
        if $meth.^name eq 'NQPRoutine' || $meth !~~ Any || $meth !~~ Regex {
            self!cache-unwrapped: $name, $meth;
        }
        else {
            self!cache-wrapped: $name, $meth, -> $c, |args {
                # Method name.
                say ('|  ' x $indent) ~ BOLD() ~ $name ~ RESET();

                # Call rule.
                $indent++;
                my $result;
                try {
                    $result := $meth($c, |args);
                    CATCH {
                        $indent--;
                    }
                }
                $indent--;

                # Dump result.
                my $match := $result.MATCH;
                say ('|  ' x $indent) ~ '* ' ~
                    ($result.MATCH ??
                        colored('MATCH', 'white on_green') ~ summary($match) !!
                        colored('FAIL', 'white on_red'));
                $result
            }
        }
    }

    sub summary($match) {
        my $snippet = $match.Str;
        my $sniplen = 60 - (3 * $indent);
        $sniplen > 0 ??
            colored(' ' ~ $snippet.substr(0, $sniplen).perl, 'white') !!
            ''
    }

    method publish_method_cache($obj) {
        # Suppress this, so we always hit find_method.
    }
}

# Export this as the meta-class for the "grammar" package declarator.
my module EXPORTHOW {
    constant grammar = TracedGrammarHOW;
}


root

README

Debugger

React

=begin React :component<HeaderCol> :id<menu> 
=para L<Documentation|/doc/introduction>
=para L<Modules| /mods>
=para L<Examples| file:../examples/index.podlite>
=para L<Download |file:../download/index.podlite>
=para L<About|file:../about/index.podlite>
=para 🔍 K<⌘K>/K<ctrl-K>
=end React


=begin React :component<HeaderCol> :id<footer>  
=begin nested :!nested
=item1 B<Language>
    =item2 L<Get started|file:../getting-started/getting-started.podlite>
    =item2 L<Why Raku?|/doc/language/faq#Why-should-I-learn-Raku-What's-so-great-about-it>
    =item2 L<Try Raku|https://glot.io/new/raku>
    =item2 L<Raku cheat sheet|https://github.com/Raku/mu/blob/master/docs/Perl6/Cheatsheet/cheatsheet.txt>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<Raku on Exercism|https://exercism.org/tracks/raku>
    =item2 L<Wikipedia|https://en.wikipedia.org/wiki/Raku_(programming_language)>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>

=end nested
=begin nested :!nested

=item1 B<L<Documentation|/doc>>
    =item2 L<Getting started, Migration guides from other languages, & Tutorials | file:../doc/introduction.podlite>
    =item2 L<Language References|file:../doc/reference.podlite>
    =item2 L<Type Reference| file:../doc/types.podlite>
    =item2 L<Miscellaneous| file:../doc/miscellaneous.podlite>
    =item2 L<FAQs (Frequently Asked Questions)|/doc/language/faq>
    =item2 L<Community|/doc/language/community>
    =item2 L<The list of all documents|file:../doc/index.podlite>

=item1 B<Resources>
    =item2 L<The Raku Guide|https://raku.guide/>
    =item2 L<Books |https://perl6book.com/>
    =item2 L<Rosetta Code | https://www.raku.org/community/rosettacode>

=end nested
=begin nested :!nested

=item1 B<Resoures>
    =item2 L<Download | file:../download/index.podlite>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>

=item1 B<Learning>
    =item2 L<The Raku Guide|https://raku.guide/>
    =item2 L<Wikibook |https://en.wikibooks.org/wiki/Raku_Programming>
    =item2 L<Books |https://perl6book.com/>
    =item2 L<Rosetta Code | https://www.raku.org/community/rosettacode>
    =item2 L<Learn Raku in Y minutes|https://learnxinyminutes.com/docs/raku/>
    =item2 L<Golfing |https://github.com/AlexDaniel/raku-golf-cheatsheet>
=end nested
=begin nested :!nested

=item1 B<Explore>
    =item2 L<Raku Blog Aggregator|https://planet.raku.org/>
    =item2 L<Rakudo Weekly|https://rakudoweekly.blog/>
    =item2 L<The Weekly Challenge |https://perlweeklychallenge.org/>
    =item2 L<Raku Advent Calendar|https://raku-advent.blog/>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>

=end nested
=end React


=begin React :component<CookieConsent> :id<CookieConsent> :buttonCaption("Got it!")
=para
This website uses cookies for analytics.
=end React


Tracer

NAME

SYNOPSIS

DESCRIPTION

AUTHOR