File Coverage

blib/lib/Date/HolidayParser.pm

Criterion	Covered	Total	%
statement	226	297	76.0
branch	111	180	61.6
condition	16	46	34.7
subroutine	15	18	83.3
pod	2	4	50.0
total	370	545	67.8

#!/usr/bin/perl
# Date::HolidayParser
# A parser of ~/.holiday-style files.
#  The format is based off of the holiday files found bundled
#  with the plan program, not any official spec. This because no
#  official spec could be found.
# Copyright (C) Eskild Hustvedt 2006, 2007, 2008, 2010
#
# This program is free software; you can redistribute it and/or modify it
# under the same terms as Perl itself. There is NO warranty;
# not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

package Date::HolidayParser;

use Moo;
use Carp;
use Exporter;
use POSIX;
use constant { true => 1, false => 0 };

# Exportable functions are EasterCalc
my @EXPORT_OK = qw(EasterCalc);

# Deprecated silencing variable
our $BeSilent;

# Version number
our $VERSION;
$VERSION = 0.4_3;

# --- Attributes ---
has 'file' => (
	is	=> 'ro',
);

has 'silent' => (
	is => 'rw',
);

has '_cache' => (
	is => 'rw',
	default => sub { {} },
);

has '_parsed' => (
	is => 'rw',
	# TODO: Move to arrayref(?)
	default => sub { {} },
);

# --- Public methods ---

# Purpose: Get the holiday information for YEAR
# Usage: my $HashRef = $object->get(YEAR);
sub get
{
	my $self = shift;
	my $Year = shift;
	if(not defined $Year)
	{
		carp('Date::HolidayParser->get needs an parameter: The year to parse');
		return;
	}
	elsif($Year =~ /\D/)
	{
		carp("Date::HolidayParser: The year must be a digit (was '$Year')");
		return;
	}
	elsif($Year < 1971 || $Year > 2037)
	{
		carp('Date::HolidayParser: Can\'t parse years lower than 1971 or higher than 2037');
		return;
	}
	if(not $self->_cache->{$Year})
	{
		$self->_cache->{$Year} = $self->_interperate_year($Year);
	}
	return($self->_cache->{$Year});
}

# --- Public functions ---

# Easter calculation using the gauss algorithm. See:
# http://en.wikipedia.org/wiki/Computus#Gauss.27s_algorithm
# Parts of the code stolen from Kenny Fowler
#
# Purpose: Calculate on which day easter occurs on in the year YEAR
# Usage: $EasterYDay = EasterCalc(YEAR);
#
# YEAR must be absolute and not relative to 1900
sub EasterCalc {
	my $year = shift;

	my $c;
	my $l;
	my $k;
	my $d;
	my $r;
	my $j;
	my $NewTime;

	$c = int($year/100);

	$l = $year % 19;

	$k = int(($c - 17)/25);

	$d = (15 + $c - int($c/4) - int(($c-$k)/3) + 19*$l) % 30;

	$r = $d - int(($d + int($l/11))/29);

	$j = ($year + int($year/4) + $r + 2 - $c + int($c/4)) % 7;

	my $number = 28 + $r - $j;

	if ($number > 31)
	{
		$number = $number - 31;
		$year = $year - 1900;
		$NewTime = POSIX::mktime(0, 0, 0, $number, 3, $year);
	} else {
		$year = $year - 1900;
		$NewTime = POSIX::mktime(0, 0, 0, $number, 2, $year);
	}
	my ($easter_sec,$easter_min,$easter_hour,$easter_mday,$easter_mon,$easter_year,$easter_wday,$easter_yday,$easter_isdst) = localtime($NewTime);
	return($easter_yday);
}

# --- Moose construction methods ---
sub BUILDARGS
{
	my $class = shift;
	my $file = shift;
	if (defined $file)
	{
		unshift(@_,'file',$file);
	}
	return $class->SUPER::BUILDARGS(@_);
}

sub BUILD
{
	my $self = shift;

	if(not $self->file)
	{
		carp('Needs a parameter: Path to the holiday file to load and parse');
	}
	elsif(not -e $self->file)
	{
		carp($self->file.': does not exist');
	}
	$self->_load_and_parse($self->file);
}


# --- Private methods ---

# Purpose: Add a parsed event to the final hash
# Usage: obj->_addParsedEvent(FinalParsing, final_mon, final_mday, holidayName, HolidayType, finalYDay, PosixYear);
# The reason this is used is because submodules, ie. ::iCalendar, overrides or wraps this to generate
# data specific to that module.
sub _addParsedEvent
{
	my($self,$FinalParsing,$final_mon,$final_mday,$HolidayName,$holidayType,$finalYDay,$PosixYear) = @_;
	$FinalParsing->{$final_mon}{$final_mday}{$HolidayName} = $holidayType;
}

# Purpose: Calculate a NumericYDay
# Usage: $CreativeParser{FinalYDay} = _HCalc_NumericYDay($CreativeParser{NumericYDay}, $CreativeParser{AddDays}, $CreativeParser{SubtDays});
sub _HCalc_NumericYDay
{
	my ($DAY, $ADD_DAYS, $SUBTRACT_DAYS) = @_;
	if(defined($ADD_DAYS))
	{
		$DAY += $ADD_DAYS;
	}
	if(defined($SUBTRACT_DAYS))
	{
		$DAY -= $SUBTRACT_DAYS;
	}
	# mday begins on 1 not 0 - we use mday for all calculations, thus
	# make the day 1-365 instead of 0-364 here
	$DAY++;
	return($DAY);
}

# Purpose: Return the English day name of the year day supplied
# Usage: $DayName = _Holiday_DayName(INTEGER_NUMBER, YEAR);
sub _Holiday_DayName
{
	my $yDay = shift;
	my $year = shift;
	$year -= 1900;

	my $PosixTime = POSIX::mktime(0, 0, 0, $yDay, 0, $year);
	die("*** _Holiday_DayName: For some reason mktime returned undef!. Was running: \"POSIX::mktime(0, 0, 0, $yDay, 0, $year)\".\nYou've probably got a loop that has started looping eternally. This error is fatal") unless(defined($PosixTime));
	my %NumToDayHash = (
		0 => 'sunday',
		1 => 'monday',
		2 => 'tuesday',
		3 => 'wednesday',
		4 => 'thursday',
		5 => 'friday',
		6 => 'saturday',
		7 => 'sunday',
	);
	my ($DayName_sec,$DayName_min,$DayName_hour,$DayName_mday,$DayName_mon,$DayName_year,$DayName_wday,$DayName_yday,$DayName_isdst) = localtime($PosixTime);
	return($NumToDayHash{$DayName_wday});
}

# Purpose: Return the yday of the supplied unix time
# Usage: $YDay = _Get_YDay(UNIX_TIME);
sub _Get_YDay
{
	my $Unix_Time = shift;
	warn("_Get_YDay: Invalid usage: must be numeric. Got \"$Unix_Time\"") and return(undef) if $Unix_Time =~ /\D/;
	my ($get_sec,$get_min,$get_hour,$get_mday,$get_mon,$get_year,$get_wday,$get_yday,$get_isdst) = localtime($Unix_Time);
	return($get_yday);
}

# Purpose: Print a warning about some error during the holiday parsing
# Usage: $self->_HolidayError(LINE_NO, FILENAME, ERROR, ACTION_TAKEN);
sub _HolidayError
{
	my $self = shift;
	$self->_PrintError('Error',@_);
}

# Purpose: Print a syntax error in a holiday file
# Usage: $self->_SyntaxError(LINE_NO, FILENAME, ERROR, ACTION_TAKEN);
sub _SyntaxError
{
	my $self = shift;
	$self->_PrintError('Syntax error',@_);
}

# Purpose. Actually print the error
# Usage: $self->_PrintError(TYPE,LINE,FILE,ERROR,ACTION);
sub _PrintError
{
	my $self = shift;
	if ($BeSilent and not $self->silent)
	{
		$self->silent(true);
		warn('$Date::HolidayParser::BeSilent is deprecated. Use the silent attribute instead\n');
	}
	elsif(not $self->silent)
	{
		my($type,$line,$file,$error,$action) = @_;
		warn("*** Holiday parser: $type: $error on line $line in $file. $action");
	}
}

# Purpose: Interperate and calculate the holiday file
# Usage: $self->_interperate_year(YEAR);
sub _interperate_year
{
	my $self = shift;
	my $Year = shift;
	my $PosixYear = $Year - 1900;
	my $FinalParsing = {};
	foreach my $LineNo (keys(%{$self->_parsed}))
	{
		my ($FinalYDay, $NumericYDay);
		my $CreativeParser = $self->_parsed->{$LineNo};
		my $HolidayName = $self->_parsed->{$LineNo}{name};
		my $File = $self->file;
		my %MonthMapping = (
			'january' => 0,
			'february' => 1,
			'march' => 2,
			'april' => 3,
			'may' => 4,
			'june' => 5,
			'july' => 6,
			'august' => 7,
			'september' => 8,
			'october' => 9,
			'november' => 10,
			'december' => 11,
		);	# Hash mapping the month name to a numeric

		if(defined($CreativeParser->{AddEaster}))
		{
			$NumericYDay = EasterCalc($Year);
		}
		if(defined($CreativeParser->{MonthDay}))
		{
			my $month = $CreativeParser->{MonthDay};
			my $day = $CreativeParser->{MonthDay};
			$month =~ s/^(\d+)-(\d+)$/$1/;
			$day =~ s/^(\d+)-(\d+)$/$2/;
			my $PosixTime = POSIX::mktime(0, 0, 0, $day, $month, $PosixYear);
			$NumericYDay = _Get_YDay($PosixTime);
		}

		unless(defined($CreativeParser->{IsMonth}) or defined($NumericYDay))
		{
			$self->_SyntaxError($LineNo, $File, 'I had no day-of-the-year nor a month defined after parsing', 'Ignoring this line');
			next;
		}

		if(defined($CreativeParser->{MustBeDay}))
		{

			# If IsMonth is defined then find a NumericYDay that we can use so that
			# the NumericYDay parsing below can do all of the heavy lifting
			if (defined($CreativeParser->{IsMonth}) and defined($CreativeParser->{Number}))
			{
				my $PosixTime = POSIX::mktime(0, 0, 0, 1, $MonthMapping{$CreativeParser->{IsMonth}}, $PosixYear);
				my $proper_yday = _Get_YDay($PosixTime);
				unless(defined($CreativeParser->{Number}))
				{
					$self->_HolidayError($LineNo, $File, '$CreativeParser->{Number} is undef', 'Skipping this line. This is probably a bug in the parser');
					next;
				}
				if($CreativeParser->{Number} eq 'last')
				{
					# Find the first of the set day
					while(1)
					{
						if(_Holiday_DayName($proper_yday, $Year) eq $CreativeParser->{MustBeDay})
						{
							last;
						}
						$proper_yday++;
					}

					# Find the last of the set day
					my $Last_YDay = $proper_yday;
					while(1)
					{
						if(_Holiday_DayName($proper_yday, $Year) eq $CreativeParser->{MustBeDay})
						{
							$proper_yday += 7;
						}
						my $MKTime = POSIX::mktime(0, 0, 0, $proper_yday, 0, $PosixYear);
						my ($detect_sec,$detect_min,$detect_hour,$detect_mday,$detect_mon,$detect_year,$detect_wday,$detect_yday,$detect_isdst) = localtime($MKTime);
						# If $detect_mon is not equal to $MonthMapping{$CreativeParser->{IsMonth}} then
						# we're now on the next month and have found the last of the day
						unless($detect_mon eq $MonthMapping{$CreativeParser->{IsMonth}})
						{
							last;
						}
						$Last_YDay = $proper_yday;
					}
					$NumericYDay = $Last_YDay;
					$CreativeParser->{BeforeOrAfter} = 'before';
				}
				else
				{
					# Parse the final
					$NumericYDay = $proper_yday;
					if($CreativeParser->{Number} eq 'first')
					{
						$CreativeParser->{BeforeOrAfter} = 'after';
					}
					elsif($CreativeParser->{Number} eq 'second')
					{
						$CreativeParser->{BeforeOrAfter} = 'after';
						$CreativeParser->{AddDays} = 7;
					}
					elsif($CreativeParser->{Number} eq 'third')
					{
						$CreativeParser->{BeforeOrAfter} = 'after';
						$CreativeParser->{AddDays} = 14;
					}
					elsif($CreativeParser->{Number} eq 'fourth')
					{
						$CreativeParser->{BeforeOrAfter} = 'after';
						$CreativeParser->{AddDays} = 21;
					}
					else
					{
						$self->_HolidayError($LineNo, $File, "\$CreativeParer->{Number} is \"$CreativeParser->{Number}\"", 'This is a bug in the parser. This line will be ignored') and next unless $CreativeParser->{Number} eq 'null';
					}
				}
			}
			elsif (defined($CreativeParser->{IsMonth}) and defined($CreativeParser->{DateNumeric}))
			{
				my $PosixTime = POSIX::mktime(0, 0, 0, $CreativeParser->{DateNumeric}, $MonthMapping{$CreativeParser->{IsMonth}}, $PosixYear);
				$NumericYDay = _Get_YDay($PosixTime);
			}
			elsif (defined($CreativeParser->{IsMonth}))
			{
				$self->_SyntaxError($LineNo, $File, 'There is a month defined but no way to find out which day of the month it is referring to', 'Ignoring this line.');
				next;
			}


			if(defined($NumericYDay))
			{
				# Parse the main NumericYDay
				$FinalYDay = _HCalc_NumericYDay($NumericYDay, $CreativeParser->{AddDays}, $CreativeParser->{SubtDays});
				unless(defined($CreativeParser->{BeforeOrAfter}))
				{
					$self->_SyntaxError($LineNo, $File, 'It was not defined if the day should be before or after', 'Defaulting to before. This is likely to cause calculation mistakes.');
					$CreativeParser->{BeforeOrAfter} = 'before';
				}
				if($CreativeParser->{BeforeOrAfter} eq 'before')
				{
					# Before parsing
					# Okay, we need to find the closest $CreativeParser{MustBeDay} before $CreativeParser{FinalYDay}
					while (1)
					{
						if(_Holiday_DayName($FinalYDay, $Year) eq $CreativeParser->{MustBeDay})
						{
							last;
						}
						$FinalYDay = $FinalYDay - 1;
					}
				}
				elsif ($CreativeParser->{BeforeOrAfter} eq 'after')
				{
					# After parsing
					# Okay, we need to find the closest $CreativeParser{MustBeDay} after $CreativeParser{FinalYDay}
					while (1)
					{
						if(_Holiday_DayName($FinalYDay, $Year) eq $CreativeParser->{MustBeDay})
						{
							last;
						}
						$FinalYDay = $FinalYDay + 1;
					}
				}
				else
				{
					$self->_HolidayError($LineNo, $File, "BeforeOrAfter was set to an invalid value ($CreativeParser->{BeforeOrAfter})", 'This is a bug in the parser. This line will be ignored.');
					return(undef);
				}
			}
			else
			{
				$self->_SyntaxError($LineNo, $File, 'A day is defined but no other way to find out when the day is could be found', 'Ignoring this line');
				next;
			}
		}
		# Calculate the yday of that day-of-the-month
		elsif(defined($CreativeParser->{IsMonth}))
		{
			unless(defined($CreativeParser->{DateNumeric}))
			{
				$self->_SyntaxError($LineNo, $File, 'It was set which month the day should be on but no information about the day itself ', 'Ignoring this line');
				next;
			}
			my $PosixTime = POSIX::mktime(0, 0, 0, $CreativeParser->{DateNumeric}, $MonthMapping{$CreativeParser->{IsMonth}}, $PosixYear);
			my $proper_yday = _Get_YDay($PosixTime);
			$FinalYDay = _HCalc_NumericYDay($proper_yday, $CreativeParser->{AddDays}, $CreativeParser->{SubtDays});
		}
		# NumericYDay-only parsing is the simplest solution. This is pure and simple maths
		elsif(defined($NumericYDay))
		{
			# NumericYDay-only parsing is the simplest solution. This is pure and simple maths
			if(defined($CreativeParser->{MustBeDay}))
			{
				$self->_SyntaxError($LineNo, $File, "It was set exactly which day the holiday should occur on and also that it should occur on $CreativeParser->{MustBeDay}", 'Ignoring the day requirement');

			}
			$FinalYDay = _HCalc_NumericYDay($NumericYDay, $CreativeParser->{AddDays}, $CreativeParser->{SubtDays});
		}

		# Verify the use of the "every" keyword
		if(defined($CreativeParser->{Every}) and not defined($CreativeParser->{Number}))
		{
			$self->_SyntaxError($LineNo, $File, 'Use of the "every" keyword without any trailing month', 'Ignoring the "every" keyword.');
		}
		if(defined($CreativeParser->{Every}) and defined($CreativeParser->{Length}))
		{
			$self->_SyntaxError($LineNo, $File, 'Use of both "every" and "length"', 'This might give unpredictable results.');
		}
		# Do the final parsing and add it to the hash
		if(defined($FinalYDay) and $FinalYDay =~ /^\d+$/)
		{
			while(1)
			{
				if(defined($FinalYDay))
				{
					my ($final_sec,$final_min,$final_hour,$final_mday,$final_mon,$final_year,$final_wday,$final_yday,$final_isdst) = localtime(POSIX::mktime(0, 0, 0, $FinalYDay, 0, $PosixYear));
					$final_mon++;
					$self->_addParsedEvent($FinalParsing, $final_mon, $final_mday, $HolidayName, $CreativeParser->{HolidayType}, $FinalYDay, $PosixYear);
				}
				if(defined($CreativeParser->{Every}) and defined($CreativeParser->{Number}))
				{
					delete($CreativeParser->{Every});
					if($CreativeParser->{Number} ne 'second')
					{
						$self->_SyntaxError($LineNo, $File, "Nonsense use of $CreativeParser->{Number} along with \"every\"",'Ignoring the "every" keyword.');
					}
					else
					{
						# Add 14 days
						$FinalYDay += 14;
					}
				}
				elsif(defined($CreativeParser->{Length}) and $CreativeParser->{Length} > 0)
				{
					$CreativeParser->{Length}-- or die('FATAL: attempted to reduce (--) length but it failed! This is a bug.');
					$FinalYDay++;
				}
				else
				{
					last;
				}
			}
		}
		elsif(defined($FinalYDay))
		{
			$self->_HolidayError($LineNo, $File, "Invalid FinalYDay ($FinalYDay) after finished parsing", 'This is a bug in the parser!');
		}
		else
		{
			$self->_HolidayError($LineNo, $File, 'No FinalYDay after finished parsing', 'This is a bug in the parser!');
		}
	}
	return($FinalParsing);
}

# Purpose: Load and parse the holiday file
# Usage: $self->_load_and_parse(FILE);
sub _load_and_parse
{
	my $self = shift;
	my $File = shift;

	carp("$File does not exist") and return(undef) unless -e $File;
	carp("$File is not readable") and return(undef) unless -r $File;

	open(my $HolidayFile, '<' ,$File) or croak("Unable to open $File for reading");
	my $LineNo;
	while(my $Line = <$HolidayFile>)
	{
		$LineNo++;
		next if $Line =~ /^\s*[:;#]/;# Ignore these lines
		next if $Line =~ /^\s*$/;# Ignore lines with only whitespace
		my $OrigLine = $Line;
		my $HolidayType;	# red or none (see above)

		my $LineMode;		# Is either PreDec or PostDec
		#  PreDec means that the holiday "mode" is declared before the name of
		#  the holiday.
		#
		#  PostDec means that the holiday "mode" is declared after the name
		#  of the holiday.
		#
		#  Note that PreDec incorporated the functions of PostDec aswell, but
		#  not the other way around
		if($Line =~ /^\s*\"/)
		{
			$LineMode = 'PostDec';
		}
		else
		{
			$LineMode = 'PreDec';
		}

		# Parse PreDec
		if($LineMode eq 'PreDec')
		{
			while(not $Line =~ /^\"/)
			{
				my $PreDec = $Line;
				$PreDec =~ s/^\s*(\w+)\s+.*$/$1/;
				chomp($PreDec);
				$Line =~ s/^\s*$PreDec\s+//;
				unless(length($PreDec))
				{
					$self->_HolidayError($LineNo, $File, "LineMode=PreDec, but the predec parser recieved \"$PreDec\" as PreDec", 'Ignoring this predec');
					last;
				}
				else
				{
					if($PreDec =~ /^(weekend|red)$/)
					{
						$HolidayType = 'red';
					}
					elsif ($PreDec =~ /^(black|small|blue|green|cyan|magenta|yellow)$/)
					{
						# These are often just "formatting" declerations, and thus ignored by the day planner
						# parser. In these cases PostDec usually declares more valid stuff
						$HolidayType = 'none';
						$Line =~ s/^[^"]+//;
						last;
					}
					else
					{
						$HolidayType = 'none';
						$self->_SyntaxError($LineNo, $File, "Unrecognized holiday type: \"$PreDec\".", 'Defaulting to "none"');
						$Line =~ s/^[^"]+//;
						last;
					}
				}
			}
		}

		# Get the holiday name
		my $HolidayName = $Line;
		chomp($HolidayName);
		$HolidayName =~ s/^\s*\"(.*)\".*$/$1/;
		$Line =~ s/^\s*\".*\"//;
		if ($HolidayName =~ /^\"*$/)
		{
			$self->_SyntaxError($LineNo, $File, 'The name of the holiday was not defined', 'Ignoring this line.');
			next;
		}

		if ($Line =~ /^\s*(weekend|red|black|small|blue|green|cyan|magenta|yellow)/)
		{
			my $HolidayDec = $Line;
			$HolidayDec =~ s/^\s*(\w+)\s+.*$/$1/;
			chomp($HolidayDec);
			$Line =~ s/^\s*$HolidayDec\s+//;

			if($HolidayDec =~ /^(weekend|red)$/)
			{
				$HolidayType = 'red';
			}
			elsif ($HolidayDec =~ /^(black|small|blue|green|cyan|magenta|yellow)$/)
			{
				# These are just "formatting" keywords, so we ignore them here.
				unless(defined($HolidayType) and $HolidayType eq 'red')
				{
					$HolidayType = 'none';
				}
			}
			else
			{
				$HolidayType = 'none';
				$self->_SyntaxError($LineNo, $File, "Unrecognized holiday type: \"$HolidayDec\".", 'Defaulting to "none"');
			}
		}
		unless($Line =~ /^\s*on/)
		{
			$self->_SyntaxError($LineNo, $File, 'Missing "on" keyword', 'Pretending it\'s there. This might give weird effects');
		}
		else
		{
			$Line =~ s/^\s*on\*//;
		}

		# ==================================================================
		# Parse main keywords
		# ==================================================================

		# This is the hardest part of the parser, now we get creative. We read each word
		# and run it through the parser
		my %CreativeParser;
		foreach (split(/\s+/, $Line))
		{
			next if /^\s*$/;
			if(/^(last|first|second|third|fourth)$/) 	# This is a number defining when a day should occur, usually used along with
			{
				# MustBeDay (below)
				$CreativeParser{Number} = $_;
				next;
			}
			elsif (/^(monday|tuesday|wednesday|thursday|friday|saturday|sunday)$/) 	# This defines which day the holiday should occur on
			{
				$CreativeParser{MustBeDay} = $_;
			}
			elsif (m#^\d+[/\.]\d+\.?$#)
			{					# This regexp gets numbers in the format XX/YY X/Y, XX.YY and X.Y
				# With an optional trailing .
				s/\.$//;
				my $day = $_;
				my $month = $_;
				if(m#^\d+\.\d+$#)
				{		# XX.YY and X.Y is in the format day.month
					$day =~ s/(\d+).*/$1/;
					$month =~ s#^\d+\.(\d+)\.?$#$1#;
				}
				elsif (m#^\d+/\d+$#)
				{	# XX/YY and X/Y is in the format month/day
					$month =~ s/(\d+).*/$1/;
					$day =~ s#^\d+/(\d+)\.?$#$1#;
				}
				$month--;	# The month in the holiday file is 1-12, we use 0-11
				$CreativeParser{MonthDay} = "$month-$day";
			}
			elsif (/^(january|february|march|april|may|june|july|august|september|october|november|december)$/)
			{	# Which month it occurs in
				$CreativeParser{IsMonth} = $_;
			}
			elsif (/^plus$/)
			{			# If the next number should be added to a NumericYDay value
				$CreativeParser{NextIs} = 'add';
			}
			elsif (/^minus$/)
			{			# If the next number should be subtracted to a NumericYDay value
				$CreativeParser{NextIs} = 'sub';
			}
			elsif (/^length$/)
			{			# How long (in days) it lasts. FIXME: is currently ignored
				$CreativeParser{NextIs} = 'length';
			}
			elsif (/^easter$/)
			{			# The day of easter
				$CreativeParser{AddEaster} = 1;
			}
			elsif (/^weekend$/)
			{			# Malplaced weekend keyword
				$HolidayType = 'red';
			}
			elsif (/^\d+$/)
			{			# Any other number, see below for parsing
				$self->_SyntaxError($LineNo, $File, 'Unreasonably high number', 'Ignoring the number. This might give weird results') and next if $_ > 365;
				# If NextIs is not defined then it's a DateNumeric
				unless(defined($CreativeParser{NextIs}) and $CreativeParser{NextIs})
				{
					$CreativeParser{DateNumeric} = $_;
					next;
				}

				# Add to
				if($CreativeParser{NextIs} eq 'add')
				{
					if(defined($CreativeParser{AddDays}))
					{
						$CreativeParser{AddDays} = $CreativeParser{AddDays} + $_;
					}
					else
					{
						$CreativeParser{AddDays} = $_;
					}
					# Subtract from
				}
				elsif ($CreativeParser{NextIs} eq 'sub')
				{
					if(defined($CreativeParser{SubtDays}))
					{
						$CreativeParser{SubtDays} = $CreativeParser{SubtDays} + $_;
					}
					else
					{
						$CreativeParser{SubtDays} = $_;
					}
					# How long should it last?
				}
				elsif ($CreativeParser{NextIs} eq 'length')
				{
					if(defined($CreativeParser{Length}))
					{
						$self->_SyntaxError($LineNo, $File, 'Multiple length statements', "Ignoring \"$_\"");
					}
					else
					{
						$CreativeParser{Length} = $_;
					}
				}

			}
			elsif (/^(before|after)$/)
			{	# If a day should be before or after a certain day/date
				$CreativeParser{BeforeOrAfter} = $_;
			}
			elsif (/^every$/)
			{
				$CreativeParser{Every} = 1;
			}
			elsif (/^(in|on|days|day)$/)
			{	# Ignored, just keywords for easier human parsing
				next;
			}
			else
			{
				$self->_SyntaxError($LineNo, $File, "Unrecognized keyword \"$_\"", 'Ignoring it. This might cause calculation mistakes! Consider using a combination of other keywords or report this as a bug to the author of this parser if you\'re certain the keyword should be supported');
			}
		}

		# ==================================================================
		# Finalize the interpretation and add it to $self
		# ==================================================================

		$CreativeParser{HolidayType} = $HolidayType;
		$CreativeParser{name} = $HolidayName;
		$self->_parsed->{$LineNo} = \%CreativeParser;
	}
	close($HolidayFile);
}


# End of Date::HolidayParser
1;

__END__