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package Class::Template;
require 5.000;
require Exporter;
@ISA = qw(Exporter);
@EXPORT = qw(members struct);
use strict;
# Template.pm --- struct/member template builder
# 12mar95
# Dean Roehrich
#
# changes/bugs fixed since 28nov94 version:
# - podified
# changes/bugs fixed since 21nov94 version:
# - Fixed examples.
# changes/bugs fixed since 02sep94 version:
# - Moved to Class::Template.
# changes/bugs fixed since 20feb94 version:
# - Updated to be a more proper module.
# - Added "use strict".
# - Bug in build_methods, was using @var when @$var needed.
# - Now using my() rather than local().
#
# Uses perl5 classes to create nested data types.
# This is offered as one implementation of Tom Christiansen's "structs.pl"
# idea.
=head1 NAME
Class::Template - struct/member template builder
=head1 EXAMPLES
=item * Example 1
use Class::Template;
struct( rusage => {
ru_utime => timeval,
ru_stime => timeval,
});
struct( timeval => [
tv_secs => '$',
tv_usecs => '$',
]);
my $s = new rusage;
=item * Example 2
package OBJ;
use Class::Template;
members OBJ {
'a' => '$',
'b' => '$',
};
members OBJ2 {
'd' => '@',
'c' => '$',
};
package OBJ2; @ISA = (OBJ);
sub new {
my $r = InitMembers( &OBJ::InitMembers() );
bless $r;
}
=head1 NOTES
Use '%' if the member should point to an anonymous hash. Use '@' if the
member should point to an anonymous array.
When using % and @ the method requires one argument for the key or index
into the hash or array.
Prefix the %, @, or $ with '*' to indicate you want to retrieve pointers to
the values rather than the values themselves.
=cut
Var: {
$Class::Template::print = 0;
sub printem { $Class::Template::print++ }
}
sub struct {
my( $struct, $ref ) = @_;
my @methods = ();
my %refs = ();
my %arrays = ();
my %hashes = ();
my $out = '';
$out = "{\n package $struct;\n sub new {\n";
parse_fields( $ref, \$out, \@methods, \%refs, \%arrays, \%hashes, 0 );
$out .= " bless \$r;\n }\n";
build_methods( $ref, \$out, \@methods, \%refs, \%arrays, \%hashes );
$out .= "}\n1;\n";
( $Class::Template::print ) ? print( $out ) : eval $out;
}
sub members {
my( $pkg, $ref ) = @_;
my @methods = ();
my %refs = ();
my %arrays = ();
my %hashes = ();
my $out = '';
$out = "{\n package $pkg;\n sub InitMembers {\n";
parse_fields( $ref, \$out, \@methods, \%refs, \%arrays, \%hashes, 1 );
$out .= " bless \$r;\n }\n";
build_methods( $ref, \$out, \@methods, \%refs, \%arrays, \%hashes );
$out .= "}\n1;\n";
( $Class::Template::print ) ? print( $out ) : eval $out;
}
sub parse_fields {
my( $ref, $out, $methods, $refs, $arrays, $hashes, $member ) = @_;
my $type = ref $ref;
my @keys;
my $val;
my $cnt = 0;
my $idx = 0;
my( $cmt, $n );
if( $type eq 'HASH' ){
if( $member ){
$$out .= " my(\$r) = \@_ ? shift : {};\n";
}
else{
$$out .= " my(\$r) = {};\n";
}
@keys = keys %$ref;
foreach (@keys){
$val = $ref->{$_};
if( $val =~ /^\*(.)/ ){
$refs->{$_}++;
$val = $1;
}
if( $val eq '@' ){
$$out .= " \$r->{'$_'} = [];\n";
$arrays->{$_}++;
}
elsif( $val eq '%' ){
$$out .= " \$r->{'$_'} = {};\n";
$hashes->{$_}++;
}
elsif( $val ne '$' ){
$$out .= " \$r->{'$_'} = \&${val}::new();\n";
}
else{
$$out .= " \$r->{'$_'} = undef;\n";
}
push( @$methods, $_ );
}
}
elsif( $type eq 'ARRAY' ){
if( $member ){
$$out .= " my(\$r) = \@_ ? shift : [];\n";
}
else{
$$out .= " my(\$r) = [];\n";
}
while( $idx < @$ref ){
$n = $ref->[$idx];
push( @$methods, $n );
$val = $ref->[$idx+1];
$cmt = "# $n";
if( $val =~ /^\*(.)/ ){
$refs->{$n}++;
$val = $1;
}
if( $val eq '@' ){
$$out .= " \$r->[$cnt] = []; $cmt\n";
$arrays->{$n}++;
}
elsif( $val eq '%' ){
$$out .= " \$r->[$cnt] = {}; $cmt\n";
$hashes->{$n}++;
}
elsif( $val ne '$' ){
$$out .= " \$r->[$cnt] = \&${val}::new();\n";
}
else{
$$out .= " \$r->[$cnt] = undef; $cmt\n";
}
++$cnt;
$idx += 2;
}
}
}
sub build_methods {
my( $ref, $out, $methods, $refs, $arrays, $hashes ) = @_;
my $type = ref $ref;
my $elem = '';
my $cnt = 0;
my( $pre, $pst, $cmt, $idx );
foreach (@$methods){
$pre = $pst = $cmt = $idx = '';
if( defined $refs->{$_} ){
$pre = "\\(";
$pst = ")";
$cmt = " # returns ref";
}
$$out .= " sub $_ {$cmt\n my \$r = shift;\n";
if( $type eq 'ARRAY' ){
$elem = "[$cnt]";
++$cnt;
}
elsif( $type eq 'HASH' ){
$elem = "{'$_'}";
}
if( defined $arrays->{$_} ){
$$out .= " my \$i;\n";
$$out .= " \@_ ? (\$i = shift) : return \$r->$elem;\n";
$idx = "->[\$i]";
}
elsif( defined $hashes->{$_} ){
$$out .= " my \$i;\n";
$$out .= " \@_ ? (\$i = shift) : return \$r->$elem;\n";
$idx = "->{\$i}";
}
$$out .= " \@_ ? (\$r->$elem$idx = shift) : $pre\$r->$elem$idx$pst;\n";
$$out .= " }\n";
}
}
1;
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