Simple parser of Westpac statements

parse-westpac

#!/usr/bin/php
<?php

/**
 * Simple parser of Westpac statements
 * @author Ben Dechrai <ben@dechrai.com>
 * @license http://www.json.org/license.html
 *
 * Run ./parse-westpac input.txt output.csv
 *
 * I make no apologies for the lack of professional consideration in the creation of this
 * script. It was hacked together. I hope it brings you joy. Back up your files first!
 *
 * This script will read a file with a similar format to:
 * 
 * DATE  DESCRIPTION OF                 DEBIT   CREDIT      BALANCE
 *       TRANSACTION
 * ________________________________________________________________
 * 2007
 *       STATEMENT OPENING BALANCE                          4593.68
 * 23OCT DEPOSIT SOME CO NAME PTY
 *       PAYMENT 1234                          1818.00      6411.68
 * 01NOV WITHDRAWAL - INTERNET
 *       ONLINE BANKING 1557288
 *       XFER  01-NOV                 1818.00               4593.68
 * 02NOV INTERNET ONLINE BANKING
 *       TRANSACTION FEE                 0.50               4593.18
 * 12NOV CLOSING BALANCE                                    4593.18
 *
 *
 * And produce an output like:
 *
 * 1193061600,"DEPOSIT SOME CO NAME PTY PAYMENT 1234",,1818,6411.68
 * 1193835600,"WITHDRAWAL - INTERNET ONLINE BANKING 1557288 XFER  01-NOV",1818,,4593.68
 * 1193922000,"INTERNET ONLINE BANKING TRANSACTION FEE",0.5,,4593.18
 *
 */

$inputfile = null;
$outputfile = null;
if(count($_SERVER['argv'])>2) list($script, $inputfile, $outputfile) = @$_SERVER['argv'];

if(is_null($inputfile)) {
	echo "NOTICE: Please provide the input and output filenames as parameters to this script\n";
	exit;
}

$transactions = array();
$transaction = newTransaction();
$balance = null;
$year = null;

$fhin = fopen($inputfile, 'r');
$fhout = fopen($outputfile, 'w');
while($line=fgets($fhin)) {

	$line = trim($line, "\n");

	if($line=='') continue;

	// Ignore separator lines
	if(preg_match('#^_+$#', $line)) continue;

	// Detect year markers
	if(preg_match('#^[0-9]{4}$#', $line)) {
		$year = intval($line);
		continue;
	}

	// Processing assumes a minimum length string
	$line = str_pad($line, 70);

	// Split string in to columns
	preg_match('#^(..)(...).(...........................)(.........)(.........)(.............)#', $line, $columns);
	list($original, $day, $month, $description, $debit, $credit, $balance) = $columns;

	// If there's a valid date, convert it
	if(preg_match('#^[0-9]{2}$#', $day)) $transaction['date'] = strtotime("$day $month $year");

	// If this transaction has a date
	if(!is_null($transaction['date'])) {

		// Collect the description
		$transaction['description'] = trim($transaction['description'] . ' ' . trim($description));

		// If there's a balance, store finances and process line
		if((float)$balance > 0) {
			if((float)$debit > 0) $transaction['debit'] = (float)$debit;
			if((float)$credit > 0) $transaction['credit'] = (float)$credit;
			if((float)$balance > 0) $transaction['balance'] = (float)$balance;

			// Ignore closing balances
			if($transaction['description']!='CLOSING BALANCE') {
				fputcsv($fhout, $transaction);
			}

			// End of transactions, start anew
			$transaction = newTransaction();
		}
	}
}

function newTransaction() {
	return array(
		'date' => null,
		'description' => '',
		'debit' => null,
		'credit' => null,
		'balance' => null
	);
}