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package CommandHelper;
# ************************************************************
# Description : Base class and factory for all command helpers.
#
# The get() method converts the define custom type
# provided to uppercase, removes the '_FILES' portion and
# adds 'Helper' to the end. If a module is found matching
# that name, it will be used to assist the ProjectCreator
# in determining which output files will be generated by
# the command given the file name and command options.
#
# Author : Chad Elliott
# Create Date : 6/30/2008
# ************************************************************
# ************************************************************
# Pragmas
# ************************************************************
use strict;
use File::Basename;
# ************************************************************
# Data Section
# ************************************************************
my %required;
my %notfound;
# ************************************************************
# Subroutine Section
# ************************************************************
sub get {
## Create the helper name
my $type = uc(shift);
$type =~ s/_FILES$/Helper/;
## Don't search the filesystem again if we didn't find one the first
## time we looked.
return undef if ($notfound{$type});
## Return the helper if we've already created one
return $required{$type} if (defined $required{$type});
## Assist users in figuring out why their helper isn't being picked up.
OutputMessage::debug(undef, "Searching @INC for $type.pm");
## If we can find a helper with this name, we will
## create a singleton of that type and return it.
foreach my $inc (@INC) {
if (-r "$inc/$type.pm") {
require "$type.pm";
$required{$type} = $type->new();
return $required{$type};
}
}
## We didn't find a helper. Keep track of that fact and return undef.
$notfound{$type} = 1;
return undef;
}
sub new {
my $class = shift;
return bless {}, $class;
}
sub get_output {
## This method is called with the filename and command options and
## expects an array reference containing filenames that will be
## generated, but can not be described using the normal Define_Custom
## syntax.
return [];
}
sub get_outputexts {
## This method is expected to return an array reference containing the
## extensions for files returned by the get_output() method. They will
## be used as regular expressions so regular expression characters
## (such as '.', '[', ']', etc.) must be escaped.
return [];
}
sub get_tied {
## This method is called with a file name and an array reference of
## files. The first expected return value is an array reference of those
## files listed in the passed array reference that are in some way tied
## to the file name passed in. The second is a component name to help
## MPC figure out a way to tie the files together. The result of "tied"
## files is that they may be compiled after the file name passed in.
return [], undef;
}
1;
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