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inc/inc_Module-Build/Module/Build/YAML.pm  view on Meta::CPAN

			if ( $lines->[0] =~ /^\s*[?\'\"]/ ) {
				croak("Module::Build::YAML does not support a feature in line '$lines->[0]'");
			}
			croak("Module::Build::YAML failed to classify line '$lines->[0]'");
		}
		my $key = $1;

		# Do we have a value?
		if ( length $lines->[0] ) {
			# Yes
			$hash->{$key} = $self->_read_scalar( shift(@$lines), [ @$indent, undef ], $lines );
		} else {
			# An indent
			shift @$lines;
			unless ( @$lines ) {
				$hash->{$key} = undef;
				return 1;
			}
			if ( $lines->[0] =~ /^(\s*)-/ ) {
				$hash->{$key} = [];
				$self->_read_array( $hash->{$key}, [ @$indent, length($1) ], $lines );
			} elsif ( $lines->[0] =~ /^(\s*)./ ) {
				my $indent2 = length("$1");
				if ( $indent->[-1] >= $indent2 ) {
					# Null hash entry
					$hash->{$key} = undef;
				} else {
					$hash->{$key} = {};
					$self->_read_hash( $hash->{$key}, [ @$indent, length($1) ], $lines );
				}
			}
		}
	}

	return 1;
}

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

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

	return 1;
}

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

	# Iterate over the documents
	my $indent = 0;
	my @lines  = ();
	foreach my $cursor ( @$self ) {
		push @lines, '---';

		# An empty document
		if ( ! defined $cursor ) {
			# Do nothing

		# A scalar document
		} elsif ( ! ref $cursor ) {
			$lines[-1] .= ' ' . $self->_write_scalar( $cursor, $indent );

		# A list at the root
		} elsif ( ref $cursor eq 'ARRAY' ) {
			unless ( @$cursor ) {
				$lines[-1] .= ' []';
				next;
			}
			push @lines, $self->_write_array( $cursor, $indent, {} );

		# A hash at the root
		} elsif ( ref $cursor eq 'HASH' ) {
			unless ( %$cursor ) {
				$lines[-1] .= ' {}';
				next;
			}
			push @lines, $self->_write_hash( $cursor, $indent, {} );

		} else {
			croak("Cannot serialize " . ref($cursor));
		}
	}

	join '', map { "$_\n" } @lines;
}

sub _write_scalar {
	my $string = $_[1];
	return '~'  unless defined $string;
	return "''" unless length  $string;
	if ( $string =~ /[\x00-\x08\x0b-\x0d\x0e-\x1f\"\'\n]/ ) {
		$string =~ s/\\/\\\\/g;
		$string =~ s/"/\\"/g;
		$string =~ s/\n/\\n/g;
		$string =~ s/([\x00-\x1f])/\\$UNPRINTABLE[ord($1)]/g;
		return qq|"$string"|;
	}
	if ( $string =~ /(?:^\W|\s)/ or $QUOTE{$string} ) {
		return "'$string'";
	}
	return $string;
}

sub _write_array {
	my ($self, $array, $indent, $seen) = @_;
	if ( $seen->{refaddr($array)}++ ) {
		die "Module::Build::YAML does not support circular references";
	}
	my @lines  = ();
	foreach my $el ( @$array ) {
		my $line = ('  ' x $indent) . '-';
		my $type = ref $el;
		if ( ! $type ) {
			$line .= ' ' . $self->_write_scalar( $el, $indent + 1 );
			push @lines, $line;

		} elsif ( $type eq 'ARRAY' ) {
			if ( @$el ) {
				push @lines, $line;
				push @lines, $self->_write_array( $el, $indent + 1, $seen );
			} else {
				$line .= ' []';
				push @lines, $line;
			}

		} elsif ( $type eq 'HASH' ) {
			if ( keys %$el ) {
				push @lines, $line;
				push @lines, $self->_write_hash( $el, $indent + 1, $seen );
			} else {
				$line .= ' {}';
				push @lines, $line;
			}

		} else {
			die "Module::Build::YAML does not support $type references";
		}
	}

	@lines;