First round of tax code replacement, adds cumulative tax support

git-svn-id: https://ledger-smb.svn.sourceforge.net/svnroot/ledger-smb/trunk@195 4979c152-3d1c-0410-bac9-87ea11338e46

1 files changed, 64 insertions, 0 deletions

diff --git a/LedgerSMB/Taxes/Simple.pm b/LedgerSMB/Taxes/Simple.pm
new file mode 100755
index 00000000..57777be4
--- /dev/null
+++ b/LedgerSMB/Taxes/Simple.pm
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+#=====================================================================
+#
+# Simple Tax support module for LedgerSMB
+# Taxes::Simple
+#  Default simple tax application
+#
+# LedgerSMB 
+# Small Medium Business Accounting software
+# http://www.ledgersmb.org/
+# 
+#
+# Copyright (C) 2006
+# This work contains copyrighted information from a number of sources all used
+# with permission.  It is released under the GNU General Public License 
+# Version 2 or, at your option, any later version.  See COPYRIGHT file for 
+# details.
+#
+#
+#======================================================================
+# This package contains tax related functions:
+#
+# calculate_tax - calculates tax on subtotal
+# apply_tax - sets $value to the tax value for the subtotal
+# extract_tax - sets $value to the tax value on a tax-included subtotal
+#
+#====================================================================
+package Taxes::Simple;
+
+use Class::Struct;
+use Math::BigFloat;
+
+struct Taxes::Simple => {
+	taxnumber => '$',
+	description => '$',
+	rate => 'Math::BigFloat',
+	chart => '$',
+	account => '$',
+	value => 'Math::BigFloat',
+	pass => '$'
+};
+
+sub calculate_tax {
+	my ($self, $form, $subtotal, $extract, $passrate) = @_;
+	my $rate = $self->rate;
+	my $tax = $subtotal * $rate / (Math::BigFloat->bone() + $passrate);
+	$tax = $subtotal * $rate if not $extract;
+	return $tax;
+}
+
+sub apply_tax {
+	my ($self, $form, $subtotal) = @_;
+	my $tax = $self->calculate_tax($form, $subtotal, 0);
+	$self->value($tax);
+	return $tax;
+}
+
+sub extract_tax {
+	my ($self, $form, $subtotal, $passrate) = @_;
+	my $tax = $self->calculate_tax($form, $subtotal, 1, $passrate);
+	$self->value($tax);
+	return $tax;
+}
+
+1;