85 lines
1.8 KiB
Perl
85 lines
1.8 KiB
Perl
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#!/usr/bin/perl
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#
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package S2::NodeUnaryExpr;
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use strict;
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use S2::Node;
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use S2::NodeIncExpr;
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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, $n) = @_;
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my $node = new S2::Node;
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bless $node, $class;
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}
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sub canStart {
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my ($class, $toker) = @_;
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return $toker->peek() == $S2::TokenPunct::MINUS ||
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$toker->peek() == $S2::TokenPunct::NOT ||
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S2::NodeIncExpr->canStart($toker);
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}
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sub parse {
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my ($class, $toker) = @_;
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my $n = new S2::NodeUnaryExpr();
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if ($toker->peek() == $S2::TokenPunct::MINUS) {
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$n->{'bNegative'} = 1;
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$n->eatToken($toker);
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} elsif ($toker->peek() == $S2::TokenKeyword::NOT) {
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$n->{'bNot'} = 1;
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$n->eatToken($toker);
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}
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my $expr = parse S2::NodeIncExpr $toker;
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if ($n->{'bNegative'} || $n->{'bNot'}) {
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$n->{'expr'} = $expr;
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$n->addNode($n->{'expr'});
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return $n;
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}
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return $expr;
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}
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sub getType {
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my ($this, $ck, $wanted) = @_;
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my $t = $this->{'expr'}->getType($ck);
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if ($this->{'bNegative'}) {
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unless ($t->equals($S2::Type::INT)) {
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S2::error($this->{'expr'}, "Can't use unary minus on non-integer.");
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}
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return $S2::Type::INT;
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}
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if ($this->{'bNot'}) {
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unless ($t->equals($S2::Type::BOOL)) {
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S2::error($this->{'expr'}, "Can't use negation operator on boolean-integer.");
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}
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return $S2::Type::BOOL;
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}
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return undef
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}
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sub asS2 {
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my ($this, $o) = @_;
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if ($this->{'bNot'}) { $o->write("not "); }
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if ($this->{'bNegative'}) { $o->write("-"); }
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$this->{'expr'}->asS2($o);
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}
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sub asPerl {
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my ($this, $bp, $o) = @_;
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if ($this->{'bNot'}) { $o->write("! "); }
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if ($this->{'bNegative'}) { $o->write("-"); }
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$this->{'expr'}->asPerl($bp, $o);
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}
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