NAME
    Spreadsheet::Engine - Core calculation engine for a spreadsheet

SYNOPSIS
      use Spreadsheet::Engine::Sheet;
        
            my $sheet = {};
            parse_sheet_save( [] => $sheet );

            execute_sheet_command($sheet => 'set A1 value n 2');
            execute_sheet_command($sheet => 'set A2 value n 4');
            execute_sheet_command($sheet => 'set A3 formula SUM(A1:A2)');
            recalc_sheet($sheet);
            print $sheet->{datavalues}{A3}; # 6

DESCRIPTION
    This provides back-end spreadsheet functionality for creating a sheet,
    setting cells to have value or formulae, and performing all necessary
    calculations. There is no front-end UI provided - this is purely the
    calculation engine.

    Over 110 spreadsheet functions are provided: see
    Spreadsheet::Engine::Functions for the full list.

WARNING
    Although the core underlying code is relatively mature and featureful,
    there will be significant interface changes and refactoring going
    forward with this version. There are very few automated tests as yet, so
    this process is likely to introduce bugs. Please pay close attention to
    the CHANGES file if you upgrade this package.

HISTORY
    The original Spreadsheet::Engine code was taken from SocialCalc version
    1.1.0, which in turn originated as wikiCalc(R) version 1.0.

AUTHORS
    wikiCalc was developed by Dan Bricklin, at Software Garden, Inc.

    SocialCalc 1.1.0 was developed by Dan Bricklin, Casey West, and Tony
    Bowden, at Socialtext, Inc.

    Spreadsheet::Engine is developed and maintained by Tony Bowden
    <tony@tmtm.com>

COPYRIGHT
    Portions (c) Copyright 2005, 2006, 2007 Software Garden, Inc. All Rights
    Reserved.

    Portions (c) Copyright 2007 Socialtext, Inc. All Rights Reserved.

    Portions (c) Copyright 2007 Tony Bowden

LICENSE
    The contents of this file are subject to the Artistic License 2.0; you
    may not use this file except in compliance with the License. You may
    obtain a copy of the License at
    http://www.perlfoundation.org/artistic_license_2_0

