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package Grammar::Marpa; |
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16261
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use strict; |
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use warnings; |
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use 5.018; |
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use utf8; |
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use overload ('qr' => 'regexify', fallback => 0); |
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784
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944
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use Marpa::R2; |
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0
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our $VERSION = '2.004'; |
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sub regexify { |
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my ($grammar) = @_; |
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use re 'eval'; |
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return qr/(?{Grammar::Marpa::parse($grammar, "$_")})/; |
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} |
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sub new { |
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my $class = shift; |
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$class = ref($class) || $class; |
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my $ebnf = ref($_[0]) eq 'HASH' ? undef : shift(@_); |
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my $pkg; |
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my %args; |
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if (ref ($_[-1]) eq 'HASH') { |
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%args = %{pop(@_)}; |
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$pkg = shift(@_) // (caller)[0]; |
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} |
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elsif (@_ % 2) { |
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$pkg = shift; |
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%args = @_; |
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} |
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else { |
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$pkg = (caller)[0]; |
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%args = @_; |
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} |
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my %Gargs; |
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$Gargs{ bless_package } = delete $args{ bless_package } if $args{ bless_package }; |
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$Gargs{ trace_file_handle } = $args{ trace_file_handle } if $args{ trace_file_handle }; |
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$ebnf //= delete $args{ source }; |
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$ebnf = $$ebnf if ref($ebnf); |
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my $G = Marpa::R2::Scanless::G->new({ source => \$ebnf, %Gargs }); |
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return bless [ $G, $pkg, \%args ] => $class; |
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} |
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sub parse { |
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my ($grammar, $string) = @_; |
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my $R = Marpa::R2::Scanless::R->new({ grammar => $grammar->[ 0 ], semantics_package => $grammar->[ 1 ], %{$grammar->[ 2 ]} }); |
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$R->read(\$string); |
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my $V = $R->value or return; |
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return $$V; |
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} |
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54
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package Grammar; |
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56
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sub Marpa { |
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return Grammar::Marpa->new(@_); |
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} |
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60
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1; |
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__END__ |