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