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package HTML::Template::Compiled::Expression;
# $Id: Expression.pm 1140 2011-11-28 00:25:38Z tinita $
use strict;
use warnings;
use constant OPERANDS => 0;
use constant ATTRIBUTES => 1;
use base 'Exporter';
our $VERSION = 0.02;
use HTML::Template::Compiled::Expression::Expressions;
my @expressions = qw(
&_expr_else
&_expr_literal
&_expr_defined
&_expr_ternary
&_expr_string
&_expr_function
&_expr_method
&_expr_elsif
);
our @EXPORT_OK = @expressions;
our %EXPORT_TAGS = (
expressions => \@expressions,
);
sub _expr_else { HTML::Template::Compiled::Expression::Else->new }
sub _expr_literal { HTML::Template::Compiled::Expression::Literal->new(@_) }
sub _expr_defined { HTML::Template::Compiled::Expression::Defined->new(@_) }
sub _expr_ternary { HTML::Template::Compiled::Expression::Ternary->new(@_) }
sub _expr_string { HTML::Template::Compiled::Expression::String->new(@_) }
sub _expr_function { HTML::Template::Compiled::Expression::Function->new(@_) }
sub _expr_method { HTML::Template::Compiled::Expression::Method->new(@_) }
sub _expr_elsif { HTML::Template::Compiled::Expression::Elsif->new(@_) }
sub new {
my $class = shift;
my $self = [ [], {} ];
bless $self, $class;
$self->init(@_);
return $self;
}
sub init {}
sub set_operands {
$_[0]->[OPERANDS] = $_[1];
}
sub get_operands {
return wantarray
? @{ $_[0]->[OPERANDS] }
: $_[0]->[OPERANDS];
}
sub set_attributes {
$_[0]->[ATTRIBUTES] = $_[1];
}
sub get_attributes { return $_[0]->[ATTRIBUTES] }
sub to_string { print "$_[0] to_string\n" }
sub level2indent {
my ($self, $level) = @_;
no warnings;
return " " x $level;
}
package HTML::Template::Compiled::Expression::Conditional;
use base qw(HTML::Template::Compiled::Expression);
sub init {
my ($self, $op) = @_;
$self->set_operands([$op]);
}
package HTML::Template::Compiled::Expression::If;
our @ISA = qw(HTML::Template::Compiled::Expression::Conditional);
sub to_string {
my ($self, $level) = @_;
my $indent = $self->level2indent($level);
my ($op) = $self->get_operands;
return $indent . 'if ( ' . (ref $op ? $op->to_string : $op) . ' ) {';
}
package HTML::Template::Compiled::Expression::Unless;
our @ISA = qw(HTML::Template::Compiled::Expression::Conditional);
sub to_string {
my ($self, $level) = @_;
my $indent = $self->level2indent($level);
my ($op) = $self->get_operands;
return $indent . 'unless ( ' . (ref $op ? $op->to_string : $op) . ' ) {';
}
package HTML::Template::Compiled::Expression::Elsif;
our @ISA = qw(HTML::Template::Compiled::Expression::Conditional);
sub to_string {
my ($self, $level) = @_;
my $indent = $self->level2indent($level);
my ($op) = $self->get_operands;
return $indent . '}' . $/ . $indent . 'elsif ( ' . $op->to_string . ' ) {';
}
package HTML::Template::Compiled::Expression::Else;
our @ISA = qw(HTML::Template::Compiled::Expression::Conditional);
sub to_string {
my ($self, $level) = @_;
my $indent = $self->level2indent($level);
return $indent . '}' . $/ . $indent . 'else {';
}
package HTML::Template::Compiled::Expression::Function;
our @ISA = qw(HTML::Template::Compiled::Expression);
sub init {
my ($self, @ops) = @_;
$self->set_operands([@ops]);
}
sub to_string {
my ($self, $level) = @_;
my $indent = $self->level2indent($level);
my ($function, @ops) = $self->get_operands;
my @strings = map {
ref $_ ? $_->to_string($level) : $_
} @ops;
return "$indent$function( " . (join ',', @strings). ')';
}
package HTML::Template::Compiled::Expression::Method;
our @ISA = qw(HTML::Template::Compiled::Expression::Function);
sub to_string {
my ($self, $level) = @_;
my $indent = $self->level2indent($level);
my ($function, $object, @args) = $self->get_operands;
my $start = $indent . (ref $object ? $object->to_string($level) : $object)
. "->$function( ";
my @strings = map {
ref $_ ? $_->to_string($level) : $_
} @args;
return $start . (join ',', @strings). ')';
}
1;
__END__
=head1 NAME
HTML::Template::Compiled::Expression - a compiled HTML template expression
=head1 DESCRIPTION
Superclass for all expression types.
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