File Coverage

blib/lib/Crayon.pm

Criterion	Covered	Total	%
statement	178	214	83.1
branch	49	62	79.0
condition	24	40	60.0
subroutine	23	27	85.1
pod	5	8	62.5
total	279	351	79.4

package Crayon;
our $VERSION = '1.00';
use 5.006;
use strict;
use warnings;
use Struct::Match qw/match/;
use Colouring::In;
use Blessed::Merge;

our ($LINES, $GLOBAL, $NESTED_GLOBAL, $NESTED_VARIABLE, $VARIABLE, $COMMENT, $CI);
BEGIN {
	$LINES = qr{ ([\{]( (?: (?> [^\{\}]+ ) | (??{ $LINES }) )*) [\}]) }x;
	$GLOBAL = qr{ (\$([^:\n]+)\:([^;\n]+);) }x;
	$VARIABLE = qr{ (\$(.*)) }x;
	$COMMENT = qr{ (\/\*[^*]*\*+([^/*][^*]*\*+)*\/) }x;
	$NESTED_GLOBAL = qr{ (\%([^\:\(]+)[\:\s\(]+( (?: (?> [^\(\)]+ ) | (??{ $NESTED_GLOBAL }) )*) [\)];) }x;
	$NESTED_VARIABLE = qr{ (\$([^\{]+)[\{]( (?: (?> [^\{\}]+ ) | (??{ $NESTED_VARIABLE }) )*) [\}]) }x;
	$CI = qr{ ((mix|lighten|darken|fade|fadeout|fadein|tint|shade|saturate|desaturate|greyscale)[\(]( (?: (?> [^\(\)]+ ) | (??{ $CI }) )*) [\)]) }x;
}

sub new {
	my ($pkg, %args) = @_;
	$args{css} ||= {};
	$args{bm} ||= Blessed::Merge->new();
	return bless \%args, $pkg;
}

sub css { $_[0]->{css} }

sub bm { $_[0]->{bm} }

sub parse {
	my ($self, $string, $css) = @_;
	$css ||= $self->{css};
	return $self->_parse_content($self->_strip_comments($string), $css);
}

sub parse_file {
	my ($self, $file, $css) = @_;
	open my $fh, '<', $file or die "cannot open file:$file $!";
	my $string = do { local $/; <$fh> };
	close $fh;
	$self->parse($string, $css);
}

sub compile {
	my ($self, $struct) = @_;
	$struct ||= $self->{css};
	my $flat = $self->_dedupe_struct(
		$self->_flattern_struct($struct)
	);
	$self->{pretty} ? $self->_pretty_compile($flat) : $self->_compile($flat);
}

sub compile_file {
	my ($self, $file, $struct) = @_;
	my $string = $self->compile($struct);
	open my $fh, '>', $file or die "cannot open file:$file $!";
	print $fh $string;
	close $fh;
}

sub _strip_comments {
	my ($self, $string) = @_;

	while ($string =~ m/$COMMENT/g) {
		$string =~ s/\Q$1\E//g;
	}
	return $string;
}

sub _parse_globals {
	my ($self, $string) = @_;
	my %globals;
	while ($string =~ m/$GLOBAL/g) {
		my ($match, $class, $props) = ($1, cws($2), cws($3));
		next unless $class && $props;
		$globals{$class} = $props;
		$string =~ s/\Q$match\E//;
	}
	while ($string =~ m/$NESTED_GLOBAL/g) {
		my ($match, $class, $props) = ($1, cws($2), cws($3));
		my %props = $self->_parse_props($props);
		$globals{$class} = \%props;
		$string =~ s/\Q$match\E//;
	}

	return (\%globals, $string);
}

sub _parse_content {
	my ($self, $string, $css) = @_;

	my $globals = {};
	while ( $string =~ m/(([^{]+)$LINES)/g ) {
		my ($match, $class, $props) = ($1, $2, $4);

		my $nested = {};
		($nested, $props) = $self->_parse_content($props, {})
			if ($props =~ m/$LINES/);

		my $ri = rindex($class, ';');
		if ($ri > 0) {
			my $p = substr $class, 0, $ri + 1, '';
			$string .= $p;
		}
		return ($css, $string) if ($class =~ m/^[^@]+:\s*\$/);
		($globals, $props) = $self->_parse_globals($props);

		my @classes = $self->_parse_classes($class);
		my %props = $self->_parse_props($props);
		for (@classes) {
			my $current = $css;
			for (@{$_}) {
				$current = $current->{$_} ||= {};
			}
			%{$current} = %{$self->bm->merge($current, $nested, \%props)};
			$current->{VARIABLES} = $self->bm->merge($current->{VARIABLES} || {}, $globals) if keys %{$globals};
		}

		$string =~ s/\Q$match\E//;
	}

	($globals, $string) = $self->_parse_globals($string);
	$css->{VARIABLES} = $globals if keys %{$globals};

	return ($css, $string);
}

sub _parse_classes {
	my ($self, $class) = @_;
	my @parts = split /,/, $class;
	return map {
		my $p = $_;
		[
			$p =~ m/^\s*\@/ ? cws($p) : do { $p =~ s/\:/ &/g; 1 } && grep {$_} split /\s+/, $p
		]
	} @parts
}

sub _parse_props {
	my ($self, $line) = @_;
	my %props;
	while ($line =~ m/(([^:]+)\:([^;]+);)/) {
		my ($match, $key, $val) = (quotemeta($1), cws($2), cws($3));
		$props{$key} = $val;
		$line =~ s/$match//;
	}
	while ($line =~ m/((\%[^;]+);)/) {
		my ($match, $key, $val) = (quotemeta($1), cws($2), cws($3));
		$props{$key} = 1;
		$line =~ s/$match//;
	}
	return %props;
}

sub _dedupe_struct {
	my ($self, $struct) = @_;
	for my $class (sort keys %{$struct}) {
		next unless $struct->{$class};
		my $new_class = $class;
		if ($class =~ m/^\@/) {
			$struct->{$new_class} = $self->_dedupe_struct($struct->{$class});
		} else {
			for my $inner (sort keys %{$struct}) {
				next if $class eq $inner;
				if (match($struct->{$class}, $struct->{$inner})) {
					delete $struct->{$inner};
					$new_class .= ", $inner";
				}
			}
			$struct->{$new_class} = delete $struct->{$class};
		}
	}
	return $struct;
}

sub _flattern_struct {
	my ($self, $struct, $key, $flat) = @_;
	$key ||= '';
	$flat ||= {};
	my $scp;

	if ($struct->{VARIABLES}) {
		$flat->{$key || 'GLOBAL'}->{VARIABLES} = delete $struct->{VARIABLES};
		$scp = $flat->{$key}->{VARIABLES} if $key;
	}
	for my $s (keys %{$struct}) {
		if ( $s =~ m/^\@/ ) {
			$flat->{$s} = $self->_flattern_struct($struct->{$s}, '', {});
		}
		elsif (ref $struct->{$s}) {
			my $k = $key ? $s =~ m/^\&(.*)/ ? $key . ':' . $1 : $key . ' ' . $s : $s;
			$self->_flattern_struct($struct->{$s}, $k, $flat);
			$flat->{$k}->{VARIABLES} = $self->bm->merge($scp, $flat->{$k}->{VARIABLES} || {}) if $scp;
		}
		else {
			$flat->{$key}->{$s} = $struct->{$s};
		}
	}
	return $flat;
}

sub _expand_nested_variables {
	my ($self, $struct, $variables) = @_;
	for my $key (keys %{$struct}) {
		if ($key =~ m/^\%(.*)/) {
			delete $struct->{$key};
			$struct = $self->bm->merge($struct, $variables->{$1});
		}
	}
	return $struct;
}


sub _compile {
	my ($self, $flat) = @_;
	my $string = '';
	my %global = %{ delete $flat->{GLOBAL} || {} };
	for my $class (sort keys %{$flat}) {
		my $variables = $self->bm->merge(
			$global{VARIABLES} || {},
			delete $flat->{$class}->{VARIABLES} || {}
		);
		$string .= $class . "{";
		$flat->{$class} = $self->_expand_nested_variables($flat->{$class}, $variables);
		next unless keys %{$flat->{$class}};
		for my $prop ( sort keys %{$flat->{$class}} ) {
			if ( ref $flat->{$class}->{$prop} ) {
				$string .= $prop . "{";
				for my $attr ( sort keys %{$flat->{$class}->{$prop}} ) {
					$string .= sprintf(
						"%s:%s;",
						$attr,
						$self->_recurse_extensions(
							$flat->{$class}->{$prop}->{$attr},
							$variables
						)
					);
				}
				$string .= "}";
			} else {
				$string .= sprintf(
					"%s:%s;",
					$prop,
					$self->_recurse_extensions(
						$flat->{$class}->{$prop},
						$variables
					)
				);
			}
		}
		$string .= "}";
	}
	return $string;
}

sub _pretty_compile {
	my ($self, $flat) = @_;
	my $string = '';
	my %global = %{ delete $flat->{GLOBAL} || {} };
	for my $class (sort keys %{$flat}) {
		my $variables = $self->bm->merge(
			$global{VARIABLES} || {},
			delete $flat->{$class}->{VARIABLES} || {}
		);
		$flat->{$class} = $self->_expand_nested_variables($flat->{$class}, $variables);
		next unless keys %{$flat->{$class}};
		$string .= join(",\n", split(", ", $class)) . " {\n";
		for my $prop ( sort keys %{$flat->{$class}} ) {
			if ( ref $flat->{$class}->{$prop} ) {
				$string .= "\t" . join(",\n\t", split(", ", $prop)) . " {\n";
				for my $attr ( sort keys %{$flat->{$class}->{$prop}} ) {
					$string .= sprintf(
						"\t\t%s: %s;\n",
						$attr,
						$self->_recurse_extensions($flat->{$class}->{$prop}->{$attr}, $variables)
					);
				}
				$string .= "\t}\n";
			} else {
				$string .= sprintf(
					"\t%s: %s;\n",
					$prop,
					$self->_recurse_extensions($flat->{$class}->{$prop}, $variables)
				);
			}
		}
		$string .= "}\n";
	}
	return $string;
}

sub _recurse_extensions {
	my ($self, $value, $variables) = @_;
	while ($value =~ m/$NESTED_VARIABLE/g || $value =~ m/$VARIABLE/g) {
		my ($match, $meth, $args) = ($1, cws($2), cws($3));
		my $val = $args ? $variables->{$meth}->{$args} : $variables->{$meth};
		$value =~ s/\Q$match\E/$val/;
	}
	while ($value =~ m/$CI/g) {
		my ($match, $meth, $args) = ($1, $2, $3);
		if ($args =~ m/$CI/) {
			$args = $self->_recurse_extensions($args);
		}
		my @params = map { cws($_) } split /,/, $args;
		no strict 'refs';
		my $ci = *{"Colouring::In::$meth"}->(@params)->toCSS;
		$value =~ s/\Q$match\E/$ci/;
	}
	return $value;
}

sub cws {
	my $string = shift;
	$string && $string =~ s/^\s*|\s*$//g;
	return $string;
}

1;

__END__