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File Name : Tiny.pm

package CSS::Tiny;

# See POD at end for docs

use strict;
BEGIN {
	require 5.004;
	$CSS::Tiny::VERSION = '1.19';
	$CSS::Tiny::errstr  = '';
}

# Create an empty object
sub new { bless {}, shift }

# Create an object from a file
sub read {
	my $class = shift;

# Check the file
	my $file = shift or return $class->_error( 'You did not specify a file name' );
	return $class->_error( "The file '$file' does not exist" )          unless -e $file;
	return $class->_error( "'$file' is a directory, not a file" )       unless -f _;
	return $class->_error( "Insufficient permissions to read '$file'" ) unless -r _;

# Read the file
	local $/ = undef;
	open( CSS, $file ) or return $class->_error( "Failed to open file '$file': $!" );
	my $contents = <CSS>;
	close( CSS );

$class->read_string( $contents )
}

# Create an object from a string
sub read_string {
	my $self = ref $_[0] ? shift : bless {}, shift;

# Flatten whitespace and remove /* comment */ style comments
	my $string = shift;
	$string =~ tr/\n\t/  /;
	$string =~ s!/\*.*?\*\/!!g;

# Split into styles
	foreach ( grep { /\S/ } split /(?<=\})/, $string ) {
		unless ( /^\s*([^{]+?)\s*\{(.*)\}\s*$/ ) {
			return $self->_error( "Invalid or unexpected style data '$_'" );
		}

# Split in such a way as to support grouped styles
		my $style      = $1;
		my $properties = $2;
		$style =~ s/\s{2,}/ /g;
		my @styles = grep { s/\s+/ /g; 1; } grep { /\S/ } split /\s*,\s*/, $style;
		foreach ( @styles ) { $self->{$_} ||= {} }

# Split into properties
		foreach ( grep { /\S/ } split /\;/, $properties ) {
			unless ( /^\s*([\w._-]+)\s*:\s*(.*?)\s*$/ ) {
				return $self->_error( "Invalid or unexpected property '$_' in style '$style'" );
			}
			foreach ( @styles ) { $self->{$_}->{lc $1} = $2 }
		}
	}

$self
}

# Copy an object, using Clone.pm if available
BEGIN { local $@; eval "use Clone 'clone';"; eval <<'END_PERL' if $@; }
sub clone {
	my $self = shift;
	my $copy = ref($self)->new;
	foreach my $key ( keys %$self ) {
		my $section = $self->{$key};
		$copy->{$key} = {};
		foreach ( keys %$section ) {
			$copy->{$key}->{$_} = $section->{$_};
		}
	}
	$copy;
}
END_PERL

# Save an object to a file
sub write {
	my $self = shift;
	my $file = shift or return $self->_error( 'No file name provided' );

# Write the file
	open( CSS, '>'. $file ) or return $self->_error( "Failed to open file '$file' for writing: $!" );
	print CSS $self->write_string;
	close( CSS );
}

# Save an object to a string
sub write_string {
	my $self = shift;

# Iterate over the styles
	# Note: We use 'reverse' in the sort to avoid a special case related
	# to A:hover even though the file ends up backwards and looks funny.
	# See http://www.w3.org/TR/CSS2/selector.html#dynamic-pseudo-classes
	my $contents = '';
	foreach my $style ( reverse sort keys %$self ) {
		$contents .= "$style {\n";
		foreach ( sort keys %{ $self->{$style} } ) {
			$contents .= "\t" . lc($_) . ": $self->{$style}->{$_};\n";
		}
		$contents .= "}\n";
	}

return $contents;
}

# Generate a HTML fragment for the CSS
sub html {
	my $css = $_[0]->write_string or return '';
	return "<style type=\"text/css\">\n\n</style>";
}

# Generate an xhtml fragment for the CSS
sub xhtml {
	my $css = $_[0]->write_string or return '';
	return "<style type=\"text/css\">\n/* <![CDATA[ */\n${css}/* ]]> */\n</style>";
}

# Error handling
sub errstr { $CSS::Tiny::errstr }
sub _error { $CSS::Tiny::errstr = $_[1]; undef }

__END__

=pod

=head1 NAME

CSS::Tiny - Read/Write .css files with as little code as possible

=head1 SYNOPSIS

# In your .css file
    H1 { color: blue }
    H2 { color: red; font-family: Arial }
    .this, .that { color: yellow }
    
    # In your program
    use CSS::Tiny;
    
    # Create a CSS stylesheet
    my $CSS = CSS::Tiny->new();
    
    # Open a CSS stylesheet
    $CSS = CSS::Tiny->read( 'style.css' );
    
    # Reading properties
    my $header_color = $CSS->{H1}->{color};
    my $header2_hashref = $CSS->{H2};
    my $this_color = $CSS->{'.this'}->{color};
    my $that_color = $CSS->{'.that'}->{color};
    
    # Changing styles and properties
    $CSS->{'.newstyle'} = { color => '#FFFFFF' }; # Add a style
    $CSS->{H1}->{color} = 'black';                # Change a property
    delete $CSS->{H2};                            # Delete a style
    
    # Save a CSS stylesheet
    $CSS->write( 'style.css' );
    
    # Get the CSS as a <style>...</style> tag
    $CSS->html;

=head1 DESCRIPTION

C<CSS::Tiny> is a perl class to read and write .css stylesheets with as 
little code as possible, reducing load time and memory overhead. CSS.pm
requires about 2.6 meg or ram to load, which is a large amount of 
overhead if you only want to do trivial things.
Memory usage is normally scoffed at in Perl, but in my opinion should be
at least kept in mind.

This module is primarily for reading and writing simple files, and anything
we write shouldn't need to have documentation/comments. If you need
something with more power, move up to CSS.pm. With the increasing complexity
of CSS, this is becoming more common, but many situations can still live
with simple CSS files.

=head2 CSS Feature Support

C<CSS::Tiny> supports grouped styles of the form
C<this, that { color: blue }> correctly when reading, ungrouping them into
the hash structure. However, it will not restore the grouping should you
write the file back out. In this case, an entry in the original file of
the form

H1, H2 { color: blue }

would become

H1 { color: blue }
    H2 { color: blue }

C<CSS::Tiny> handles nested styles of the form C<P EM { color: red }>
in reads and writes correctly, making the property available in the
form

$CSS->{'P EM'}->{color}

C<CSS::Tiny> ignores comments of the form C</* comment */> on read
correctly, however these comments will not be written back out to the
file.

=head1 CSS FILE SYNTAX

Files are written in a relatively human-orientated form, as follows:

H1 {
        color: blue;
    }
    .this {
    	color: red;
    	font-size: 10px;
    }
    P EM {
    	color: yellow;
    }

When reading and writing, all property descriptors, for example C<color>
and C<font-size> in the example above, are converted to lower case. As an
example, take the following CSS.

P {
    	Font-Family: Verdana;
    }

To get the value C<'Verdana'> from the object C<$CSS>, you should
reference the key C<$CSS-E<gt>{P}-E<gt>{font-family}>.

=head1 METHODS

=head2 new

The constructor C<new> creates and returns an empty C<CSS::Tiny> object.

=head2 read $filename

The C<read> constructor reads a CSS stylesheet, and returns a new
C<CSS::Tiny> object containing the properties in the file.

Returns the object on success, or C<undef> on error.

=head2 read_string $string

The C<read_string> constructor reads a CSS stylesheet from a string.

Returns the object on success, or C<undef> on error.

=head2 clone

The C<clone> method creates an identical copy of an existing C<CSS::Tiny>
object.

=head2 write_string

Generates the stylesheet for the object and returns it as a string.

=head2 write

The C<write $filename> generates the stylesheet for the properties, and 
writes it to disk. Returns true on success. Returns C<undef> on error.

=head2 html

The C<html> method generates the CSS, but wrapped in a C<style> HTML tag,
so that it can be dropped directly onto a HTML page.

=head2 xhtml

The C<html> method generates the CSS, but wrapped in a C<style> XHTML tag,
so that it can be dropped directly onto an XHTML page.

=head2 errstr

When an error occurs, you can retrieve the error message either from the
C<$CSS::Tiny::errstr> variable, or using the C<errstr> method.

=head1 CAVEATS

=head2 CSS Rule Order

While the order of rules in CSS is important, this is one of the features
that is sacrificed to keep things small and dependency-free. If you need
to preserve order yourself, we recommend that you upgrade to the more
powerful L<CSS> module.

If this is not possible in your case, alternatively it can be done with the
help of another module such as L<Tie::IxHash>:

my $css = CSS::Tiny->new;
    tie %$css, 'Tie::IxHash';
    $css->read('style.css');

Note: You will also need to remember to add the additional dependency to
your code or module in this case.

=head1 SUPPORT

Bugs should be reported via the CPAN bug tracker at

L<http://rt.cpan.org/NoAuth/ReportBug.html?Queue=CSS-Tiny>

For other issues, or commercial enhancement or support, contact the author.

=head1 AUTHOR

Adam Kennedy E<lt>adamk@cpan.orgE<gt>

=head1 SEE ALSO

L<CSS>, L<http://www.w3.org/TR/REC-CSS1>, L<Config::Tiny>, L<http://ali.as/>

=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.

=cut

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2023-08-25 11:53:16
..	dir	-	root/root	0755	2023-08-25 12:05:20
Minifier.pm	text/plain	9.35 KB	root/root	0644	2007-08-03 07:49:34
Squish.pm	text/plain	12.79 KB	root/root	0644	2010-11-05 07:32:46
Tiny.pm	text/plain	8.69 KB	root/root	0644	2010-09-03 12:35:39

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