The bank_statement_parser gem allows simple parsing of English language statements from HSBC bank in the UK. It is highly unlikely that other banks and/or languages will ever be supported.

Add the following line to the Gemfile of the application.

gem 'bank_statement_parser'

Then run

bundle

Run the following command.

gem install bank_statement_parser

Parse a statement file from the local filesystem:

require 'bank_statement_parser'

# Plain text statement file path
file_path = 'January_2011.txt'

begin
  # Attempt to parse the file
  bank_statement = BankStatementParser.parse file_path, :hsbc

  # Statement metadata
  puts "Name %s, account number %s, sort code %s, statement date %s" %
    [bank_statement.name,
     bank_statement.account_number,
     bank_statement.sort_code,
     bank_statement.statement_date.to_s]
  puts "Opening balance %f, closing balance %f" %
    [bank_statement.opening_balance,
     bank_statement.closing_balance]

  # Statement records
  bank_statement.records.each do |record|
    puts "Statement record #{record}"
  end
rescue StandardError => e
  puts "#{e}"
end

Parse a statement file from an FTP, HTTP or HTTPS server:

require 'bank_statement_parser'

statement_uri = 'http://statement.bank.com/mine/2011/01.txt'
bank_statement = BankStatementParser.parse statement_uri

The BankStatementParser.parse method can be passed a String, File, IO, Pathname, StringIO, Tempfile or URI. A String is interpreted as a file path, or as a URI if it has a ftp://, http:// or https:// prefix.

To add a parser for a new type of bank statement, simply subclass BankStatementParser::Base and implement the handle_line() method.

Optionally, you can override the reset() method to perform class-specific reset work; however, you must remember to call the base class reset() from the override.

An example parser follows.

module BankStatementParser
  class Barclays < Base

    def handle_line line
      # Keep going if we manage to parse the line
      return true if do_something_with_line(line)

      # Otherwise, halt the parser
      return false
    end

    private

    def reset
      # Reset the base class
      super

      # Perform class-specific parser reset work here
    end

    def do_something_with_line line
      # Implement class-specific line parsing here
      return false
    end

  end
end

Additionally, you will need to register your new parser, before use:

BankStatementParser.register_bank(:barclays, 'Barclays')

HSBC statements produced from 13 July 2014 are available in PDF format. Earlier statements can be "printed" from the web view, and thus saved as PDF. This parser should work with either of these types of statement, following conversion from PDF to plain text.

A utility script bank_statement_to_text.sh is provided, which uses pdftotext(1) to convert a statement PDF to a plain text file suitable for parsing.

Copyright 2015-2018 Simon Dawson spdawson@gmail.com

bank_statement_parser is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

bank_statement_parser is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with bank_statement_parser. If not, see http://www.gnu.org/licenses/.