TITLE

AUTHOR

See L<https://en.wikipedia.org/wiki/Newick_format>.


code

=begin code :lang<raku>
use v6;



grammar Newick {
    rule TOP { '(' <subtree>** 2..3 % \, ');' }
    rule subtree { <species> | '(' <subtree>** 2 % \, ')' }
    token species { <.ident>+ }
}

# vim: expandtab shiftwidth=4 ft=perl6

=end code


root

CSS2.1 Grammar


CSSGrammar.pm

Simple strings


SimpleStrings.pm

para

L<Examples| file:../examples/index.podlite>


L<Download |file:../download/index.podlite>


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


HEADER

FOOTER

Newick tree format


A trivial parser that handles quoted strings with backslash-escaped
quotes and either single or double quotes used to delimit.


=begin code :lang<raku>
use v6;



grammar String::Simple::Grammar {
    rule TOP {^ <string> $}
    # Note for now, {} gets around a rakudo binding issue
    token string { <quote> {} <quotebody($<quote>)> $<quote> }
    token quote { '"' | "'" }
    token quotebody($quote) { ( <escaped($quote)> | <!before $quote> . )* }
    token escaped($quote) { '\\' ( $quote | '\\' ) }
}

# The parse-tree builder ultimately returns the string itself.
class String::Simple::Actions {
    method TOP($/) { make $<string>.made }
    method string($/) { make $<quotebody>.made }
    method quotebody($/) { make [~] $0.map: {.<escaped>.made or ~$_} }
    method escaped($/) { make ~$0 }
}

# vim: sw=4 softtabstop=4 ai expandtab filetype=perl6

=end code


Newick.pm

This should be doing CSS2.1; hopefully CSS3 when that's ready (but that may
be a while).


=begin code :lang<raku>
use v6;



grammar CSSGrammar {
        # builtin: ident (we use cssident), alpha

        token TOP         { ^ <import>* <css>* $ || <.panic: "CSS parsing failed"> }
        token css         { <ruleset> | <media> | <page> }
        rule ruleset      { <selector> +% ',' '{' ~ '}' <declarations> }
        rule declarations { <declaration> +%% ';' }
        rule selector     { <simple_selector> +% <combinator>? }
        rule simple_selector   { <element_name> [ <hcap> ]* | <hcap>+ }
        token hcap        { '#' | <class> | '[' ~ ']' <attrib> | <pseudo> }
        token class       { '.' <cssident> }
        token element_name { <cssident> | '*' }
        token attrib      { <cssident> [ [ '=' | <INCLUDES> | <DASHMATCH> ] [ <cssident> | <string> ] ]? }
        token pseudo      { ':' [ <FUNCTION> ~ ')' <cssident>? | <cssident> ] }
        token combinator  { '+' | '>' }

        rule declaration  { <property> ':' <expr> <prio>? }
        token property    { <cssident> }
        token prio        { <important_sym> }
        token expr        { <term> +% <operator>? }
        token cssident    { '-'?<namestart><namechar>* }
        rule term         { <unary_operator>?
                [ <percentage> | <length> | <ems> | <exs> | <angle> | <time> | <freq> | <number> ]
                | <string> | <uri> | <function> | <cssident> | <hexcolor>
        }
        token operator    { '/' | ',' }
        token function    { <FUNCTION> ~ ')' <expr> }
        token hexcolor    { '#' }
        token namestart   { <alpha> | _ }
        token namechar    { \w | '-' }
        token unary_operator { '-' | '+' }
        token number      { \d+ | \d* '.' \d+ }
        token percentage  {   <number> '%' }
        token length      {:i <number> [ px | cm | mm | in | pt | pc ] }
        token ems         {:i <number>? em }
        token exs         {:i <number>? ex }
        token angle       {:i <number> [ deg | rad | grad ] }
        token time        {:i <number> [ ms | s ] }
        token freq        {:i <number> k?hz }
        token string      { ('"' | \') (<- nl>|\\ \n)*? $0 }
        token uri         {:i url '(' ~ ')' [ <string> | <url>] }
        token url         { ( <- [ \' \" \\]> )* }
        token FUNCTION    { <cssident> '(' }
        token INCLUDES    { '~=' }
        token DASHMATCH   { '|=' }

        token important_sym {:i '!'important }

        rule import       {:i'@import' [<string>|<uri>] <media_list>? ';' }

        rule media        {:i'@media' <media_list> <media_rules> }
        rule media_list   {<media_type> +%','}
        rule media_type   { <cssident> }
        rule media_rules  { '{' ~ '}' <ruleset>* }

        rule page         {:i'@page' [':'<cssident>]? '{' ~ '}' <declarations> }

        # Comments and whitespace.
        token comment {'' | '/*' .*? '*/'}
        token nl {\xA|"\r"\xA|"\r"|"\f"}
        token ws { <!ww> [ nl | "\t" | " " | <comment> ]* }

        method panic($e)  {die $e;}
}

# vim: expandtab shiftwidth=4 ft=perl6

=end code

The Raku Knowledge Base


=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


AUTHOR

See Also