=pod

=head1 NAME

Spreadsheet::XLSX::Reader::LibXML - Read xlsx spreadsheet files with LibXML

=head1 SYNOPSIS

The following uses the 'TestBook.xlsx' file found in the t/test_files/ folder

	#!/usr/bin/env perl
	use strict;
	use warnings;
	use Spreadsheet::XLSX::Reader::LibXML;

	my $parser   = Spreadsheet::XLSX::Reader::LibXML->new();
	my $workbook = $parser->parse( 'TestBook.xlsx' );

	if ( !defined $workbook ) {
		die $parser->error(), "\n";
	}

	for my $worksheet ( $workbook->worksheets() ) {

		my ( $row_min, $row_max ) = $worksheet->row_range();
		my ( $col_min, $col_max ) = $worksheet->col_range();

		for my $row ( $row_min .. $row_max ) {
			for my $col ( $col_min .. $col_max ) {

				my $cell = $worksheet->get_cell( $row, $col );
				next unless $cell;

				print "Row, Col    = ($row, $col)\n";
				print "Value       = ", $cell->value(),       "\n";
				print "Unformatted = ", $cell->unformatted(), "\n";
				print "\n";
			}
		}
		last;# In order not to read all sheets
	}

	###########################
	# SYNOPSIS Screen Output
	# 01: Row, Col    = (0, 0)
	# 02: Value       = Category
	# 03: Unformatted = Category
	# 04: 
	# 05: Row, Col    = (0, 1)
	# 06: Value       = Total
	# 07: Unformatted = Total
	# 08: 
	# 09: Row, Col    = (0, 2)
	# 10: Value       = Date
	# 11: Unformatted = Date
	# 12: 
	# 13: Row, Col    = (1, 0)
	# 14: Value       = Red
	# 16: Unformatted = Red
	# 17: 
	# 18: Row, Col    = (1, 1)
	# 19: Value       = 5
	# 20: Unformatted = 5
	# 21: 
	# 22: Row, Col    = (1, 2)
	# 23: Value       = 2017-2-14 #(shows as 2/14/2017 in the sheet)
	# 24: Unformatted = 41318
	# 25: 
	# More intermediate rows ... 
	# 82: 
	# 83: Row, Col    = (6, 2)
	# 84: Value       = 2016-2-6 #(shows as 2/6/2016 in the sheet)
	# 85: Unformatted = 40944
	###########################

=head1 DESCRIPTION

This is another package for parsing Excel 2007+ workbooks.  The goals of this package are 
three fold.  First, as close as possible produce the same output as is visible in an 
excel spreadsheet with exposure to underlying settings from Excel.  Second, adhere as 
close as is reasonable to the L<Spreadsheet::ParseExcel> API (where it doesn't conflict 
with the first objective) so that less work would be needed to integrate ParseExcel and 
this package.  Third, to provide an XLSX sheet parser that is built on L<XML::LibXML>.  
The other two primary options for XLSX parsing on CPAN use either a one-off XML parser 
(L<Spreadsheet::XLSX>) or L<XML::Twig> (L<Spreadsheet::ParseXLSX>).  In general if 
either of them already work for you without issue then there is no reason to change to 
this package.  I personally found some bugs and functionality boundaries in both that I 
wanted to improve, and by the time I had educated myself enough to make improvement 
suggestions including root causing the bugs to either the XML parser or the reader logic 
I had written this.

In the process of learning and building I also wrote some additional features for 
this parser that are not found in the L<Spreadsheet::ParseExcel> package.  For instance 
in the L<SYNOPSIS|/SYNOPSIS> the '$parser' and the '$workbook' are actually the same 
class.  You could combine both steps by calling ->new with the 'file_name' (or 
'file_handle') attribute called out.  Afterward it is still possible to call ->error on 
the instance.  The test in that case for load success would be 
$instance->has_file_name(handle) Another improvement (from my perspective) is date 
handling.  This package allows for a simple pluggable custom output format that is very 
flexible as well as handling dates older than 1-January-1900.  I leveraged coercions from 
L<Type::Tiny|Type::Tiny::Manual> to do this but anything that follows that general format 
will work here.  Additionally, this is a L<Moose> based package.  As such it is designed 
to be (fairly) extensible by writing roles 
and adding them to this package rather than requiring that you extend the package to some 
new branch.  Read the full documentation for all opportunities!

In the realm of extensibility, L<XML::LibXML> has multiple ways to read an XML file but 
this release only has an L<XML::LibXML::Reader> parser option.  Future iterations could 
include a DOM parser option.  Additionally this package does not (yet) provide the same 
access to the formatting elements provided in L<Spreadsheet::ParseExcel>.  That is on the 
longish and incomplete TODO list.

The package operates on the workbook with three primary tiers of classes.  All other 
classes in this package are for architectual extensibility.

=over

---> L<Workbook level|Spreadsheet::XLSX::Reader::LibXML>

=over

---> L<Worksheet level|Spreadsheet::XLSX::Reader::LibXML::Worksheet>*

=over

---> L<Cell level|Spreadsheet::XLSX::Reader::LibXML::Cell>* - 
L<optional|/group_return_type>

=back

=back

=back

=head2 Warnings

B<1.> Archive-Zip versions greater than 1.30 appear to be broken.  This package requires 
Archive::Zip so I reccomend Archive-Zip-1.30.

B<2.> This package requires that you can load L<XML::LibXML> which requires the L<libxml2
http://xmlsoft.org/> and 'libxml2-devel' libraries.  Many PC's have these already but you 
should try to load XML::LibXML separatly if you have problems loading this.  L<If it loads 
but you have a test suit failure please log a case in my repo on L<github|SUPPORT>>.

B<3.> Earlier versions of this package would extract the .xlsx file to a temp directory and 
release the file lock on the original file while still retaining the information for access 
by the parser.  In order to resolve some some temp dir cleanup issues this package no 
longer releases the lock on the file during reading.  (It will release the file lock and 
clean up any temp directories when the class is closed)

B<*3.> Not all workbook sheets (tabs) are created equal!  Some Excel sheet tabs are only a 
chart.  These tabs are 'chartsheets'.  The methods with 'worksheet' in the name only act on 
the sub set of tabs that are worksheets.  Future methods with 'chartsheet' in the name will 
focus on the subset of sheets that are chartsheets.  Methods with just 'sheet' in the name 
have the potential to act on both.  The documentation for the chartsheet level class is found 
in L<Spreadsheet::XLSX::Reader::LibXML::Chartsheet> (still under construction).  All chartsheet 
classes do not provide access to cells.

=head2 Attributes

Data passed to new when creating an instance.  For modification of these attributes see the 
listed 'attribute methods'. For general information on attributes see 
L<Moose::Manual::Attributes>.  For ways to manage the workbook when opened see the 
L<Primary Methods|/Primary Methods>.  For additional lesser used workbook options 
see L<Secondary Methods|/Secondary Methods>.

B<Example>

	$workbook_instance = Spreadsheet::XLSX::Reader::LibXML->new( %attributes )

I<note: if a file name or file handle for an .xlsx file are not included in the initial 
%attributes then one of them must be set by L<method|/set_file_name> before the rest of 
the package can be used.>

=head3 file_name

=over

B<Definition:> This attribute holds the full file name and path for the xlsx file to be 
parsed.

B<Default> no default - either this or a L<file handle|/file_handle> must be provided to 
read a file

B<Range> any unencrypted xlsx file that can be opened in Microsoft Excel

B<attribute methods> Methods provided to adjust this attribute
		
=over

B<set_file_name>

=over

B<Definition:> change the file name value in the attribute (this will reboot 
the workbook instance)

=back

B<has_file_name>

=over

B<Definition:> this is used to see if the workbook loaded correctly using the 
file_name option to open an Excel .xlsx file.

=back

=back

=back

=head3 file_handle

=over

B<Definition:> This attribute holds a copy of the passed file handle reference.

B<Default> no default - either this or a L<file name|/file_name> must be provided to read 
a file

B<Range> any unencrypted xlsx file handle that can be opened in Microsoft Excel

B<attribute methods> Methods provided to adjust this attribute
		
=over

B<set_file_handle>

=over

B<Definition:> change the set file handle (this will reboot the workbook instance)

=back

B<has_file_handle>

=over

B<Definition:> this is used to see if the workbook loaded correctly when using the 
file_handle option to open an Excel .xlsx file.

=back

=back

=back

=head3 error_inst

=over

B<Definition:> This attribute holds an 'error' object instance.  It should have several 
methods for managing errors.  Currently no error codes or error language translation 
options are available but this should make implementation of that easier.

B<Default:> a L<Spreadsheet::XLSX::Reader::LibXML::Error> instance with the attributes set 
as;
	
	( should_warn => 0 )

B<Range:> The minimum list of methods to implement for your own instance is;

	error set_error clear_error set_warnings if_warn
	
The error instance must be able to extract the error string from a passed error 
object as well.  For now the current implementation will attempt ->as_string first 
and then ->message if an object is passed.

B<attribute methods> Methods provided to adjust this attribute

=over

B<get_error_inst>

=over

B<Definition:> returns this instance

=back

B<error>

=over

B<Definition:> delegated method from the class used to get the most recently 
logged error string

=back

B<set_error>

=over

B<Definition:> delegated method from the class used to set a new error string 
(or pass an error object for extraction of the error string)

=back

B<clear_error>

=over

B<Definition:> delegated method from the class used to clear the current error 
string

=back

B<set_warnings>

=over

B<Definition:> delegated method from the class used to turn on or off real time 
warnings when errors are set

=back

B<if_warn>

=over

B<Definition:> delegated method from the class used to extend this package and 
see if warnings should be emitted.

=back
		
=back

=back

=head3 sheet_parser

=over

B<Definition:> This sets the way the .xlsx file is parsed.  For now the only 
choice is 'reader'.

B<Default> 'reader'

B<Range> 'reader'

B<attribute methods> Methods provided to adjust this attribute
		
=over

B<set_parser_type>

=over

B<Definition:> the way to change the parser type

=back

B<get_parser_type>

=over

B<Definition:> returns the currently set parser type

=back

=back

=back

=head3 count_from_zero

=over

B<Definition:> Excel spreadsheets count from 1.  L<Spreadsheet::ParseExcel> 
counts from zero.  This allows you to choose either way.

B<Default> 1

B<Range> 1 = counting from zero like Spreadsheet::ParseExcel, 
0 = Counting from 1 like Excel

B<attribute methods> Methods provided to adjust this attribute
		
=over

B<counting_from_zero>

=over

B<Definition:> a way to check the current attribute setting

=back

B<set_count_from_zero>

=over

B<Definition:> a way to change the current attribute setting

=back

=back

=back

=head3 file_boundary_flags

=over

B<Definition:> When you request data to the right of the last column or below 
the last row of the data this package can return 'EOR' or 'EOF' to indicate that 
state.  This is especially helpful in 'while' loops.  The other option is to 
return 'undef'.  This is problematic if some cells in your table are empty which 
also returns undef.  What is determined to be the last column and row is determined 
by the attribute L<empty_is_end|/empty_is_end>.

B<Default> 1

B<Range> 1 = return 'EOR' or 'EOF' flags as appropriate, 0 = return undef when 
requesting a position that is out of bounds

B<attribute methods> Methods provided to adjust this attribute
		
=over

B<boundary_flag_setting>

=over

B<Definition:> a way to check the current attribute setting

=back

B<change_boundary_flag>

=over

B<Definition:> a way to change the current attribute setting

=back

=back

=back

=head3 empty_is_end

=over

B<Definition:> The excel convention is to read the table left to right and top 
to bottom.  Some tables have an uneven number of columns with real data from row 
to row.  This allows the several methods that excersize a 'next' function to wrap 
after the last element with data rather than going to the max column.  This also 
triggers 'EOR' flags after the last data element and befor the sheet max 
column when not implementing 'next' functionality.

B<Default> 0

B<Range> 1 = treat all columns short of the max column for the sheet as being in 
the table, 0 = end each row after the last cell with data rather than going to the 
max sheet column

B<attribute methods> Methods provided to adjust this attribute
		
=over

B<is_empty_the_end>

=over

B<Definition:> a way to check the current attribute setting

=back

B<set_empty_is_end>

=over

B<Definition:> a way to set the current attribute setting

=back

=back

=back

=head3 values_only

=over

B<Definition:> Excel with store information about a cell even if it only contains 
formatting data.  In many cases you only want to see cells that actually have 
values.  This attribute will change the package behaviour regarding cells that have 
formatting stored against that cell but no actual value.

B<Default> 0 

B<Range> 1 = skip cells with formatting only and treat them as completely empty, 
0 = return informat about cells that only contain formatting

B<attribute methods> Methods provided to adjust this attribute
		
=over

B<get_values_only>

=over

B<Definition:> a way to check the current attribute setting

=back

B<set_values_only>

=over

B<Definition:> a way to set the current attribute setting

=back

=back

=back

=head3 from_the_edge

=over

B<Definition:> Some data tables start in the top left corner.  Others do not.  I 
don't reccomend that practice but when aquiring data in the wild it is often good 
to adapt.  This attribute sets whether the file reads from the top left edge or from 
the top row with data and starting from the leftmost column with data.

B<Default> 1

B<Range> 1 = treat the top left corner of the sheet as the beginning of rows and 
columns even if there is no data in the top row or leftmost column, 0 = Set the 
minimum row and minimum columns to be the first row and first column with data

B<attribute methods> Methods provided to adjust this attribute
		
=over

B<set_from_the_edge>

=over

B<Definition:> a way to set the current attribute setting

=back

=back

=back

=head3 default_format_list

=over

B<Definition:> This is the attribute containing the L<role|Moose::Manual::Roles> that 
manages the way number formats and encoding conversions are implemented for this sheet.  
This is a departure from L<Spreadsheet::ParseExcel> for two reasons.  First, it doesn't 
use the same modules.  Second, this requires a Moose role (not a class) with two methods 
where ParseExcel uses an object instance.

B<Default> L<Spreadsheet::XLSX::Reader::LibXML::FmtDefault>

B<Range> a L<Moose> role with the methods 'get_defined_excel_format' and 
'change_output_encoding' it should be noted that libxml2 which is the underlying code 
for L<XML::LibXML> always attempts to get the data into perl friendly strings based on the 
xml file encoding setting.  That means this role should only tweak the data on the way out 
of memory and does not operate on the data on its way into memory.

B<attribute methods> Methods provided to adjust this attribute
		
=over

B<get_default_format_list>

=over

B<Definition:> a way to check the current attribute setting

=back

B<set_default_format_list>

=over

B<Definition:> a way to set the current attribute setting

=back

=back

=back

=head3 format_string_parser

=over

B<Definition:> This is a Moose role that interprets the excel L<format string
|https://support.office.com/en-us/article/Create-or-delete-a-custom-number-format-2d450d95-2630-43b8-bf06-ccee7cbe6864?ui=en-US&rs=en-US&ad=US> 
into a L<Type::Tiny> coercion.  If you don't like the output or the method 
you can write your own Moose Role and add it here.

B<Default> L<Spreadsheet::XLSX::Reader::LibXML::ParseExcelFormatStrings>

B<Range> a L<Moose> role with the method 'parse_excel_format_string'

B<attribute methods> Methods provided to adjust this attribute
		
=over

B<get_format_string_parser>

=over

B<Definition:> a way to check the current attribute setting

=back

B<set_format_string_parser>

=over

B<Definition:> a way to set the current attribute setting

=back

=back

=back

=head3 group_return_type

=over

B<Definition:> Traditionally ParseExcel returns a cell object with lots of methods 
to reveal information about the cell.  In reality the extra information is not used very 
much (witness the popularity of L<Spreadsheet::XLSX>).  Because many users don't need or 
want the extra cell formatting information it is possible to get either the raw cell value 
or the formatted cell value returned either the way the Excel file specified or the way you 
specify instead of a Cell instance with all the data. .  See 
L<Spreadsheet::XLSX::Reader::LibXML::Worksheet/custom_formats> to insert custom targeted 
formats for use with the parser.  All empty cells return undef no matter what.

B<Default> instance

B<Range> instance = returns a populated L<Spreadsheet::XLSX::Reader::LibXML::Cell> instance,
unformatted = returns just the raw value of the cell with no modifications, value = returns 
just the formatted value stored in the excel cell

B<attribute methods> Methods provided to adjust this attribute
		
=over

B<get_group_return_type>

=over

B<Definition:> a way to check the current attribute setting

=back

B<set_group_return_type>

=over

B<Definition:> a way to set the current attribute setting

=back

=back

=back

=head3 empty_return_type

=over

B<Definition:> Traditionally L<Spreadsheet::ParseExcel> returns an empty string for cells 
with unique formatting but no stored value.  It may be that the more accurate way of returning 
undef works better for you.  This will turn that behaviour on.  I<If Excel stores an empty 
string having this attribute set to 'undef_string' will still return the empty string!>

B<Default> empty_string

B<Range>
	empty_string = populates the unformatted value with '' even if it is set to undef
	undef_string = if excel stores undef for an unformatted value it will return undef

B<attribute methods> Methods provided to adjust this attribute
		
=over

B<get_empty_return_type>

=over

B<Definition:> a way to check the current attribute setting

=back

B<set_empty_return_type>

=over

B<Definition:> a way to set the current attribute setting

=back

=back

=back

=head2 Primary Methods

These are the primary ways to use this class.  They can be used to open an .xlsx workbook.  
They are also ways to investigate information at the workbook level.  For information on 
how to retrieve data from the worksheets see the 
L<Worksheet|Spreadsheet::XLSX::Reader::LibXML::Worksheet> and 
L<Cell|Spreadsheet::XLSX::Reader::LibXML::Cell> documentation.  For additional workbook 
options see the L<Secondary Methods|/Secondary Methods> 
and the L<Attributes|/Attributes> sections.  The attributes section specifically contains 
all the methods used to adjust the attributes of this class.

All methods are object methods and should be implemented on the object instance.

B<Example:>

	my @worksheet_array = $workbook_instance->worksheets;

=head3 parse( $file_name|$file_handle, $formatter )

=over

B<Definition:> This is a convenience method to match L<Spreadsheet::ParseExcel/parse($filename, $formatter)>.  
It only works if the L<file_name|/file_name> or L<file_handle|/file_handle> attribute was not 
set with ->new.  It is one way to set the 'file_name' or 'file_handle' attribute [and the 
L<default_format_list|/default_format_list> attribute].  I<You cannot pass both a file name 
and a file handle simultaneously to this method.>

B<Accepts:>

	$file = a valid xlsx file [or a valid xlsx file handle] (required)
	[$formatter] = see the default_format_list attribute for valid options (optional)

B<Returns:> itself when passing with the xlsx file loaded to the workbook level or 
undef for failure.

=back

=head3 worksheets

=over

B<Definition:> This method will return an array (I<not an array reference>) 
containing a list of references to all worksheets in the workbook.  This is not 
a reccomended method.  It is provided for compatibility to Spreadsheet::ParseExcel.  
For alternatives see the L<get_worksheet_names|/get_worksheet_names> method and the
L<worksheet|/worksheet( $name )> methods.  B<For now it also only returns the tabular 
worksheets in the workbook.  All chart worksheets are ignored! (future inclusion will 
included a backwards compatibility policy)>

B<Accepts:> nothing

B<Returns:> an array ref of  L<Worksheet|Spreadsheet::XLSX::Reader::LibXML::Worksheet> 
objects for all worksheets in the workbook.

=back

=head3 worksheet( $name )

=over

B<Definition:> This method will return an  object to read values in the worksheet.  
If no value is passed to $name then the 'next' worksheet in physical order is 
returned. I<'next' will NOT wrap>  It also only iterates through the 'worksheets' 
in the workbook (but not the 'chartsheets').

B<Accepts:> the $name string representing the name of the worksheet object you 
want to open.  This name is the word visible on the tab when opening the spreadsheet 
in Excel. (not the underlying zip member file name - which can be different.  It will 
not accept chart tab names.)

B<Returns:> a L<Worksheet|Spreadsheet::XLSX::Reader::LibXML::Worksheet> object with the 
ability to read the worksheet of that name.  It returns undef and sets the error attribute 
if a 'chartsheet' is requested.  Or in 'next' mode it returns undef if past the last sheet.

B<Example:> using the implied 'next' worksheet;

	while( my $worksheet = $workbook->worksheet ){
		print "Reading: " . $worksheet->name . "\n";
		# get the data needed from this worksheet
	}

=back

=head3 in_the_list

=over

B<Definition:> This is a predicate method that indicates if the 'next' 
L<worksheet|/worksheet( $name )> function has been implemented at least once.

B<Accepts:>nothing

B<Returns:> true = 1, false = 0
once

=back

=head3 start_at_the_beginning

=over

B<Definition:> This restarts the 'next' worksheet at the first worksheet.  This 
method is only useful in the context of the L<worksheet|/worksheet( $name )> 
function.

B<Accepts:> nothing

B<Returns:> nothing

=back

=head3 worksheet_count

=over

B<Definition:> This method returns the count of worksheets (excluding charts) in 
the workbook.

B<Accepts:>nothing

B<Returns:> an integer

=back

=head3 get_worksheet_names

=over

B<Definition:> This method returns an array ref of all the worksheet names in the 
workbook.  (It excludes chartsheets.)

B<Accepts:> nothing

B<Returns:> an array ref

B<Example:> Another way to parse a workbook without building all the sheets at 
once is;

	for $sheet_name ( @{$workbook->worksheet_names} ){
		my $worksheet = $workbook->worksheet( $sheet_name );
		# Read the worksheet here
	}

=back

=head3 get_sheet_names

=over

B<Definition:> This method returns an array ref of all the sheet names (tabs) in the 
workbook.  (It includes chartsheets.)

B<Accepts:> nothing

B<Returns:> an array ref

=back

=head3 get_chartheet_names

=over

B<Definition:> This method returns an array ref of all the chartsheet names in the 
workbook.  (It excludes worksheets.)

B<Accepts:> nothing

B<Returns:> an array ref

=back

=head3 sheet_name( $Int )

=over

B<Definition:> This method returns the sheet name for a given physical position 
in the workbook from left to right. It counts from zero even if the workbook is in 
'count_from_one' mode.  B(It will return chart names but chart tab names cannot currently 
be converted to worksheets). You may actually want L<worksheet_name|worksheet_name( $Int )> 
instead of this function.

B<Accepts:> integers

B<Returns:> the sheet name (both workbook and worksheet)

B<Example:> To return only worksheet positions 2 through 4

	for $x (2..4){
		my $worksheet = $workbook->worksheet( $workbook->worksheet_name( $x ) );
		# Read the worksheet here
	}

=back

=head3 sheet_count

=over

B<Definition:> This method returns the count of all sheets in the workbook (worksheets 
and chartsheets).

B<Accepts:> nothing

B<Returns:> a count of all sheets

=back

=head3 worksheet_name( $Int )

=over

B<Definition:> This method returns the worksheet name for a given order in the workbook 
from left to right. It does not count any 'chartsheet' positions as valid.  It counts 
from zero even if the workbook is in 'count_from_one' mode.

B<Accepts:> integers

B<Returns:> the worksheet name

B<Example:> To return only worksheet positions 2 through 4 and then parse them

	for $x (2..4){
		my $worksheet = $workbook->worksheet( $workbook->worksheet_name( $x ) );
		# Read the worksheet here
	}

=back

=head3 worksheet_count

=over

B<Definition:> This method returns the count of all worksheets in the workbook (not 
including chartsheets).

B<Accepts:> nothing

B<Returns:> a count of all worksheets

=back

=head3 chartsheet_name( $Int )

=over

B<Definition:> This method returns the chartsheet name for a given order in the workbook 
from left to right. It does not count any 'worksheet' positions as valid.  It counts 
from zero even if the workbook is in 'count_from_one' mode.

B<Accepts:> integers

B<Returns:> the chartsheet name

=back

=head3 chartsheet_count

=over

B<Definition:> This method returns the count of all chartsheets in the workbook (not 
including worksheets).

B<Accepts:> nothing

B<Returns:> a count of all chartsheets

=back

=head3 error

=over

B<Definition:> This returns the most recent error message logged by the package.  This 
method is mostly relevant when an unexpected result is returned by some other method.

B<Accepts:>nothing

B<Returns:> an error string.

=back

=head2 Secondary Methods

These are the additional methods that include ways to extract additional information about 
the .xlsx file and ways to modify workbook and worksheet parsing that are less common.  
Note that all methods specifically used to adjust workbook level attributes are listed in 
the L<Attribute|/Attribute> section.  This section primarily contains methods for or 
L<delegated|Moose::Manual::Delegation> from private attributes set up during the workbook 
load process.

=head3 parse_excel_format_string( $format_string )

=over

Roundabout delegation from 
L<Spreadsheet::XLSX::Reader::LibXML::ParseExcelFormatStrings/parse_excel_format_string( $string )>

=back

=head3 creator

=over

B<Definition:> Retrieve the stored creator string from the Excel file.

B<Accepts> nothing

B<Returns> A string

=back

=head3 date_created

=over

B<Definition:> returns the date the file was created

B<Accepts> nothing

B<Returns> A string

=back

=head3 modified_by

=over

B<Definition:> returns the user name of the person who last modified the file

B<Accepts> nothing

B<Returns> A string

=back

=head3 date_modified

=over

B<Definition:> returns the date when the file was last modified

B<Accepts> nothing

B<Returns> A string

=back

=head3 get_epoch_year

=over

B<Definition:> This returns the epoch year defined by the Excel workbook.

B<Accepts:> nothing

B<Returns:> 1900 = Windows Excel or 1904 = Apple Excel

=back

=head3 get_shared_string_position

=over

Roundabout delegation from 
L<Spreadsheet::XLSX::Reader::LibXML::SharedStrings/get_shared_string_position( $int )>

=back

=head3 get_format_position

=over

Roundabout delegation from 
L<Spreadsheet::XLSX::Reader::LibXML::Styles/get_format_position( $int )>

=back

=head3 set_defined_excel_format_list

=over

Roundabout delegation from 
L<Spreadsheet::XLSX::Reader::LibXML::FmtDefault/set_defined_excel_format_list>

=back

=head3 change_output_encoding

=over

Roundabout delegation from 
L<Spreadsheet::XLSX::Reader::LibXML::FmtDefault/change_output_encoding( $string )>

=back

=head3 set_format_cache_behavior

=over

Roundabout delegation from 
L<Spreadsheet::XLSX::Reader::LibXML::ParseExcelFormatStrings/set_cache_behavior>

=back

=head3 get_date_behavior

=over

Roundabout delegation from 
L<Spreadsheet::XLSX::Reader::LibXML::ParseExcelFormatStrings/get_date_behavior>

=back

=head3 set_date_behavior

=over

Roundabout delegation from 
L<Spreadsheet::XLSX::Reader::LibXML::ParseExcelFormatStrings/set_date_behavior>

=back

=head1 BUILD / INSTALL from Source

B<1.> Ensure that you have the libxml2 B<and libxml2-devel> libraries installed using 
your favorite system package installer.  One way to check if it is already installed 
is to attempt to install L<XML::LibXML> separatly with cpan.

=over

L<http://xmlsoft.org/>

=back
	
B<2.> Download a compressed file with this package code from your favorite source

=over

L<Meta::CPAN|https://metacpan.org/pod/Spreadsheet::XLSX::Reader::LibXML>

L<github|https://github.com/jandrew/Spreadsheet-XLSX-Reader-LibXML>

L<CPAN|http://search.cpan.org/~jandrew/Spreadsheet-XLSX-Reader-LibXML/>

=back
	
B<3.> Extract the code from the compressed file.

=over

If you are using tar on a .tar.gz file this should work:

	tar -zxvf Spreadsheet-XLSX-Reader-LibXML-v0.xx.tar.gz
	
=back

B<4.> Change (cd) into the extracted directory

B<5.> Run the following

=over

(for Windows find what version of make was used to compile your perl)

	perl  -V:make
	
(then for Windows substitute the correct make function (s/make/dmake/g)? below)
	
=back

	perl Makefile.PL

	make

	make test

	make install # As sudo/root

	make clean

=head1 SUPPORT

=over

L<github Spreadsheet::XLSX::Reader::LibXML/issues|https://github.com/jandrew/Spreadsheet-XLSX-Reader-LibXML/issues>

=back

=head1 TODO

=over

B<1.> Add POD for all the new chart methods!

B<1.> Build an 'Alien::LibXML::Devel' package to load the libxml2-devel libraries from source and 
require that and L<Alien::LibXML> in the build file. So all needed requirements for L<XML::LibXML> 
are met

=over

Both libxml2 and libxml2-devel libraries are required for XML::LibXML

=back

B<2.> Add a pivot table reader (Not just read the values from the sheet)

B<3.> Add calc chain methods

B<4.> Add more exposure to workbook formatting methods

B<5.> Build a DOM parser alternative for the sheets

=over

(Theoretically faster than the reader but uses more memory)

=back

B<6.> Make L</empty_is_end> finish a sheet for rows with formatting but no data.  
Possibly this requires an additional attribute 'next_ignores_empty'?

=back

=head1 AUTHOR

=over

Jed Lund

jandrew@cpan.org

=back

=head1 CONTRIBUTORS

This is the (likely incomplete) list of people who have helped
make this distribution what it is, either via code contributions, 
patches, bug reports, help with troubleshooting, etc. A huge
'thank you' to all of them.

=over

L<Frank Maas|https://github.com/Frank071>

L<Stuart Watt|https://github.com/morungos>

=back

=head1 COPYRIGHT

This program is free software; you can redistribute
it and/or modify it under the same terms as Perl itself.

The full text of the license can be found in the
LICENSE file included with this module.

This software is copyrighted (c) 2014, 2015 by Jed Lund

=head1 DEPENDENCIES

=over

L<perl 5.010|perl/5.10.0>

L<Archive::Zip>

L<Carp>

L<Clone>

L<DateTime::Format::Flexible>

L<DateTimeX::Format::Excel>

L<IO::File>

L<List::Util> - 1.33

L<Moose> - 2.1213

L<MooseX::HasDefaults::RO>

L<MooseX::ShortCut::BuildInstance> - 1.032

L<MooseX::StrictConstructor>

L<Type::Tiny> - 1.000

L<XML::LibXML>

L<version> - 0.077

=back

=head1 SEE ALSO

=over

L<Spreadsheet::ParseExcel> - Excel 2003 and earlier

L<Spreadsheet::XLSX> - 2007+

L<Spreadsheet::ParseXLSX> - 2007+

L<Log::Shiras|https://github.com/jandrew/Log-Shiras>

=over

All lines in this package that use Log::Shiras are commented out

=back

=back

=cut