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#!/usr/bin/env raku
my %VARS;
my %FNS = '+' => { $^a + $^b },
'-' => { $^a - $^b },
'*' => { $^a * $^b },
'/' => { $^a / $^b };
grammar Simple {
token TOP { <statement>* %% \n || <comment> || <code> }
token statement { <comment> || <loop> || <assignement> || <call> }
token comment { '#' \N* }
regex loop { 'for' \s+ $<cond>=<code> \n+ $<body> = <statement>* \s* 'end'
{ my $cond = $<cond>;
my @statements = $<statement>;
while eval($cond) { eval($_) for @statements; }
}
}
token assignement { $<identifier> = \w+ \s* '=' \s* <code> {%VARS{$<identifier>} = $<code>.made} }
token call { $<args> = (\w+ %% \s+) $<fn> = \S+ {say "[call] $<fn> ($<args>)"} }
token code { $<value> = [\d+|'"' <(<-["]>*)> '"'] {make $<value>} | $<identifier> = \w+ {make %VARS{$<identifier>} // 0 } }
}
sub eval($code) {
say "[code] $code";
Simple.parse($code)<code>.made;
}
my $code = Simple.parse: q:to/LANG/;
n = 5
z = 0
for z
end
LANG
say $code;
say %VARS;
Raku
INFO