47 lines
767 B
Perl
Executable File
47 lines
767 B
Perl
Executable File
#!/usr/bin/perl
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#
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package S2::NodeUnnecessary;
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use strict;
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use S2::Node;
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use vars qw($VERSION @ISA);
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$VERSION = '1.0';
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@ISA = qw(S2::Node);
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sub new {
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my ($class) = @_;
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my $node = new S2::Node;
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bless $node, $class;
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}
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sub parse {
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my ($class, $toker) = @_;
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my $n = new S2::NodeUnnecessary;
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$n->skipWhite($toker);
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return $n;
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}
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sub canStart {
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my ($class, $toker) = @_;
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return ! $toker->peek()->isNecessary();
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}
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sub asS2 {
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my ($this, $o) = @_;
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# do nothing when making the canonical S2 (the
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# nodes write their whitespace)
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}
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sub asPerl {
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my ($this, $bp, $o) = @_;
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# do nothing when making the perl output
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}
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sub check {
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my ($this, $l, $ck) = @_;
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# nothing can be wrong with whitespace and comments
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}
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