Current File : //usr/share/perl5/XML/XPathEngine/Literal.pm
# $Id: Literal.pm,v 1.11 2001/03/16 11:10:08 matt Exp $
package XML::XPathEngine::Literal;
use XML::XPathEngine::Boolean;
use XML::XPathEngine::Number;
use strict;
use Carp;
use overload
'""' => \&value,
'cmp' => \&cmp;
sub new {
my $class = shift;
my ($string) = @_;
# $string =~ s/"/"/g;
# $string =~ s/'/'/g;
bless \$string, $class;
}
sub as_string {
my $self = shift;
my $string = $$self;
$string =~ s/'/'/g;
return "'$string'";
}
sub as_xml {
my $self = shift;
my $string = $$self;
return "<Literal>$string</Literal>\n";
}
sub value {
my $self = shift;
$$self;
}
sub value_as_number {
my $self = shift;
warn "numifying '", $$self, "' to '", +$$self, "'\n";
+$$self;
}
sub cmp {
my $self = shift;
my ($cmp, $swap) = @_;
if ($swap) {
return $cmp cmp $$self;
}
return $$self cmp $cmp;
}
sub evaluate {
my $self = shift;
$self;
}
sub to_boolean {
my $self = shift;
return (length($$self) > 0) ? XML::XPathEngine::Boolean->True : XML::XPathEngine::Boolean->False;
}
sub to_number { return XML::XPathEngine::Number->new($_[0]->value); }
sub to_literal { return $_[0]; }
sub string_value { return $_[0]->value; }
sub getChildNodes { croak "cannot get child nodes of a literal"; }
sub getAttributes { croak "cannot get attributes of a literal"; }
sub getParentNode { croak "cannot get parent node of a literal"; }
1;
__END__
=head1 NAME
XML::XPathEngine::Literal - Simple string values.
=head1 DESCRIPTION
In XPath terms a Literal is what we know as a string.
=head1 API
=head2 new($string)
Create a new Literal object with the value in $string. Note that " and
' will be converted to " and ' respectively. That is not part of the XPath
specification, but I consider it useful. Note though that you have to go
to extraordinary lengths in an XML template file (be it XSLT or whatever) to
make use of this:
<xsl:value-of select=""I'm feeling &quot;sad&quot;""/>
Which produces a Literal of:
I'm feeling "sad"
=head2 value()
Also overloaded as stringification, simply returns the literal string value.
=head2 cmp($literal)
Returns the equivalent of perl's cmp operator against the given $literal.
=cut
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