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Spreadsheet-XLSX-Reader-LibXML-v0.36.26
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/ Spreadsheet::XLSX::Reader::LibXML::Worksheet

NAME

Spreadsheet::XLSX::Reader::LibXML::Worksheet - Read xlsx worksheets with LibXML

SYNOPSIS

See the SYNOPSIS in the Workbook class

DESCRIPTION

This documentation is intended to cover all 'tabular' data worksheets. Even if they contain embedded charts. If the tab is a 'chartsheet' then please review the documentation for Chartsheets.

The worksheet class provided by this package is an amalgam of a class, a few roles, and a few traits aggregated at run time based on attribute settings from the workbook level class. This documentation shows the ways to use the resulting instance. First, it is best to generate a worksheet instance from the workbook class using one of the various worksheet methods. Once you have done that there are several ways to step through the data inside of each worksheet and access information from the identified location in the sheet of the .xlsx file.

Extending the worksheet class

In general since this is a Moose package I tried to architect it as extensibly as possible. One advantage of that is the ability to delay the building of the final worksheet class until runtime to allow for the needed roles and traits to be aggregated into different base classes so that different file types can be read and different parsing methods can be implemented based on runtime decisions. On the other hand since the worksheet class is built at runtime and the eventual class guts are based on logic from runtime inputs it is difficult to extend this class at runtime. With that said, the architecture should allow you to fork the package on github and build a module for just the behaviour that you wish to change rather that doing a full rewrite. The file t/Spreadsheet/XLSX/Reader/LibXML/10-get_cell.t represents a good 'under the hood' example of the way all the elements are integrated into the larger worksheet class as a whole. If you are feeling extra generous and the update you create can co-exist with this package please send a pull request on github.

The way to set what type of information is returned

There is a an attribute set in the workbook instance called group_return_type . Setting this attribute will return either a full Spreadsheet::XLSX::Reader::LibXML::Cell instance, just the unformatted value, or the formatted value. For more details on the data available in the Cell instance read the documentation for the Cell instance.

Methods to access data from the sheet

These are the various functions that are available (independent of tabualar sheet parser type) to select which cell(s) to read. When allowed the requested row and column numbers are interpreted using the attribute "count_from_zero" in Spreadsheet::XLSX::Reader::LibXML. all the methods are object methods performed on the worksheet.

Example:

my $cell_data = $worksheet->get_cell( $row, $column );

get_cell( $row, $column )

    Definition: Indicate both the requested row and requested column and the information for that position will be returned. Both $row and $column are required

    Accepts: the list ( $row, $column ) both required

    Returns: see the attribute "group_return_type" in Spreadsheet::XLSX::Reader::LibXML for details on what is returned

get_next_value

    Definition: Reading left to right and top to bottom this will return the next cell with a value. This actually includes cells with no value but some unique formatting such as cells that have been merged with other cells.

    Accepts: nothing

    Returns: see the attribute "group_return_type" in Spreadsheet::XLSX::Reader::LibXML for details on what is returned

fetchrow_arrayref( $row )

    Definition: In an homage to DBI I included this function to return an array ref of the cells or values in the requested $row. If no row is requested this returns the 'next' row. In the array ref any empty and non unique cell will show as 'undef'.

    Accepts: undef = next|$row = a row integer indicating the desired row

    Returns: an array ref of all possible column positions in that row with data filled in per the attribute "group_return_type" in Spreadsheet::XLSX::Reader::LibXML.

fetchrow_array( $row )

set_headers( @header_row_list )

    Definition: This function is used to set headers used in the function fetchrow_hashref. It accepts a list of row numbers that will be collated into a set of headers used to build the hashref for each row. The header rows are coallated in sequence with the first number in the list taking precedence. The list is also used to set the lowest row of the headers in the table. All rows at that level and higher will be considered out of the table and will return 'undef' while setting the error instance. If some of the columns do not have values then the instance will auto generate unique headers for each empty header column to fill out the header ref. Please pay attention to the fact that this method is also affected by the attribute "group_return_type" in Spreadsheet::XLSX::Reader::LibXML with one exception. If that attribute is set to 'instance' the headers will be composed of the converted 'value's of each cell rather than either the instance pointer string or the 'unformatted' value.

    Accepts: a list of row numbers

    Returns: an array ref of the built headers for review

fetchrow_hashref( $row )

    Definition: This function is used to return a hashref representing the data in the specified row. If no $row value is passed it will return the 'next' row of data. A call to this function without setting the headers first will return 'undef' and set the error instance.

    Accepts: a target $row number for return values or undef meaning 'next'

    Returns: a hash ref of the values for that row. This function ignores the attribute group_return_type when it is set to 'instance' and returns 'value's instead. See also the attributes min_header_col and max_header_col to pare the start and end columns of the returned hash ref.

min_row

    Definition: This is the minimum row determined when the sheet is opened. This value is affected by the workbook attributes from_the_edge, and count_from_zero

    Accepts: nothing

    Returns: an integer

has_min_row

max_row

    Definition: This is the maximum row with data listed in the sheet. This value is affected by the workbook attribute count_from_zero

    Accepts: nothing

    Returns: an integer

has_max_row

min_col

    Definition: This is the minimum column with data listed in the sheet. This value is affected by the workbook attributes from_the_edge, and count_from_zero

    Accepts: nothing

    Returns: an integer

has_min_col

max_col

    Definition: This is the maximum row with data listed in the sheet. This value is affected by the workbook attribute count_from_zero

    Accepts: nothing

    Returns: an integer

has_max_col

row_range

    Definition: This returns a list containing the minimum row number followed by the maximum row number. This list is affected by the workbook attributes from_the_edge, and count_from_zero

    Accepts: nothing

    Returns: ( $minimum_row, $maximum_row )

col_range

    Definition: This returns a list containing the minimum column number followed by the maximum column number. This list is affected by the workbook attributes from_the_edge, and count_from_zero

    Accepts: nothing

    Returns: ( $minimum_column, $maximum_column )

Attributes

These are attributes that affect the behaviour of the returned data in the worksheet instance. In general you would not set these on instance generation, Because the primary class will generate this instance for you. Rather you would use the attribue methods listed with each attribute to change the attribute after the worksheet instance has been generated. Additionally at the end of this list that a reference to the workbook is stored in one of the attributes as well so many workbook settings can be adjusted from the worksheet instance..

min_header_col

    Definition: This attribute affects the hashref that is returned in the method fetchrow_hashref. If the table you are reading does not start in the first column of the sheet then you need to indicate where to start. Otherwize the fetchrow_hashref method will return auto generated headers and attach them to the cell data outside your table but inside the sheet data boundaries. This attribute tells fetchrow_hashref what column to use to start the hash ref build.

    Default: undef (which is equivalent to the minimum column of the sheet)

    Range: The minimum column of the sheet to or less than the max_header_col

    attribute methods Methods provided to adjust this attribute

      get_min_header_col

        Definition: returns the value stored in the attribute

      set_min_header_col

        Definition: Sets a new value for the attribute

      has_min_header_col

        Definition: Indicates if the attribute has a stored value

max_header_col

    Definition: This attribute affects the hashref that is returned in the method fetchrow_hashref. If the table you are reading ends before the max column of the sheet then you need indicate where to stop reading. Otherwize the fetchrow_hashref method will return auto generated headers and attach them to the cell values outside your table. This attribute tells fetchrow_hashref what column to use to end the hash ref build.

    Default: undef (equal to the maximum column of the sheet)

    Range: The maximum column of the sheet to or less than the min_header_col

    attribute methods Methods provided to adjust this attribute

      get_max_header_col

        Definition: returns the value stored in the attribute

      set_max_header_col

        Definition: Sets a new value for the attribute

      has_max_header_col

        Definition: Indicates if the attribute has a stored value

custom_formats

    Definition: This package will generate value conversions that generally match the numerical conversions set in the Excel spreadsheet. However, it may be that you want to convert the unformatted values for certain cells, rows, or columns in some user defined way. Build an object instance that has the two following methods; 'assert_coerce' and 'display_name'. Then place it here in this attribute as a value to a hash key that is keyed on the target Cell ID, or the row number, or the Column letter callout and this package will assign that conversion when calling 'value' on the cell rather than the conversion stored in the Excel spreadsheet.

    Default: {} = no custom conversions

    Range: keys representing cell ID's, row numbers, or column letter callouts followed by values that are instance references for specific conversions.

    Example:

    Building a converter on the fly (or use Type::Tiny or MooseX::Types)

    use DateTimeX::Format::Excel;
use DateTime::Format::Flexible;
use Type::Coercion;
use Type::Tiny;
my @args_list  = ( system_type => 'apple_excel' );
my $num_converter  = DateTimeX::Format::Excel->new( @args_list );

# build conversion subroutines (number and strings to DateTime objects)
my $string_via = sub{ 
      my $str = $_[0];
      return DateTime::Format::Flexible->parse_datetime( $str );
};
my $num_via	= sub{
      my $num = $_[0];
      return $num_converter->parse_datetime( $num );
};

# Combine conversion subroutines into a coercion object! 
#  (Note numbers are attempted first)
my $date_time_from_value = Type::Coercion->new( 
	type_coercion_map => [ Num, $num_via, Str, $string_via, ],
);

# Install the coercion in a type that ensures it passes through a DateTime check
$date_time_type = Type::Tiny->new(
   name       => 'Custom_date_type',
   constraint => sub{ ref($_) eq 'DateTime' },
   coercion   => $date_time_from_value,
);

# Chained coercions! to handle first the $date_time_from_value coercion 
#    and then build a specific date string output
$string_type = Type::Tiny->new(
   name       => 'YYYYMMDD',
   constraint => sub{
      !$_ or (
         $_ =~ /^\d{4}\-(\d{2})-(\d{2})$/ and
         $1 > 0 and $1 < 13 and $2 > 0 and $2 < 32 
      )
   },
   coercion => Type::Coercion->new(
   type_coercion_map =>[
      $date_time_type->coercibles, sub{ 
         my $tmp = $date_time_type->coerce( $_ );
         $tmp->format_cldr( 'yyyy-MM-dd' )
      },
   ],
), );

    Setting custom conversions to use for the worksheet

    my $worksheet = $workbook->worksheet( 'TargetWorksheetName' );
$worksheet->set_custom_formats( {
    E10 => $date_time_type,
    10  => $string_type,
    D14 => $string_type,
} );

    attribute methods Methods provided to adjust this attribute

      set_custom_formats

        Definition: Sets a new (complete) hashref for the attribute

      has_custom_format( $key )

        Definition: checks if the specific custom format $key is set

      set_custom_format( $key => $coercion, ... )

        Definition: sets the specific custom format $key(s) with $coercion(s)

      get_custom_format( $key )

        Definition: returns the specific custom format for that $key (see has_custom_format )

sheet_rel_id

    Definition: This is the relId of the sheet listed in the XML of the .xlsx file. You probably don't care and you should never set this value.

    attribute methods Methods provided to adjust this attribute

      rel_id

        Definition: returns the value stored in the attribute

sheet_id

    Definition: This is the Id of the sheet listed in the XML of the .xlsx file. I beleive this to be the number used in vbscript to reference the sheet. You should never set this value.

    attribute methods Methods provided to adjust this attribute

      sheet_id

        Definition: returns the value stored in the attribute

sheet_position

    Definition: This is the visual sheet position in the .xlsx file. You should never set this value.

    attribute methods Methods provided to adjust this attribute

      position

        Definition: returns the value stored in the attribute

sheet_name

    Definition: This is the visual sheet name in the .xlsx file. You should never set this value.

    attribute methods Methods provided to adjust this attribute

      get_name

        Definition: returns the value stored in the attribute

sheet_type

    Definition: There are two possible kinds of sheets in an Excel file; 'worksheets' and 'chartsheets' if you are not sure what kind of sheet you have this is where the information is stored.

    attribute methods Methods provided to adjust this attribute

      get_sheet_type

        Definition: returns the value stored in the attribute (worksheet)

workbook_instance

SUPPORT

TODO

    1. Add a way to set manual headers for fetchrow_hashref

    2. Add a pivot table reader (sometimes returns different values than just the sheet shows)

    3. Add more exposure to worksheet formatting values

    4. Add a DOM version of the parser

AUTHOR

Jed Lund
jandrew@cpan.org

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

DEPENDENCIES

SEE ALSO