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# Create an empty YAML::Tiny object
sub new {
	my $class = shift;
	bless [ @_ ], $class;
}

# Create an object from a file
sub read {
	my $class = ref $_[0] ? ref shift : shift;

	# Check the file
	my $file = shift or return $class->_error( 'You did not specify a file name' );
	return $class->_error( "File '$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 _;

	# Slurp in the file
	local $/ = undef;
	local *CFG;
	unless ( open(CFG, $file) ) {
		return $class->_error("Failed to open file '$file': $!");
	}
	my $contents = <CFG>;
	unless ( close(CFG) ) {
		return $class->_error("Failed to close file '$file': $!");
	}

	$class->read_string( $contents );
}

# Create an object from a string
sub read_string {
	my $class  = ref $_[0] ? ref shift : shift;
	my $self   = bless [], $class;
	my $string = $_[0];
	unless ( defined $string ) {
		return $self->_error("Did not provide a string to load");
	}

	# Byte order marks
	# NOTE: Keeping this here to educate maintainers
	# my %BOM = (
	#     "\357\273\277" => 'UTF-8',
	#     "\376\377"     => 'UTF-16BE',
	#     "\377\376"     => 'UTF-16LE',
	#     "\377\376\0\0" => 'UTF-32LE'
	#     "\0\0\376\377" => 'UTF-32BE',
	# );
	if ( $string =~ /^(?:\376\377|\377\376|\377\376\0\0|\0\0\376\377)/ ) {
		return $self->_error("Stream has a non UTF-8 BOM");
	} else {
		# Strip UTF-8 bom if found, we'll just ignore it
		$string =~ s/^\357\273\277//;
	}

	# Try to decode as utf8
	utf8::decode($string) if HAVE_UTF8;

	# Check for some special cases
	return $self unless length $string;
	unless ( $string =~ /[\012\015]+\z/ ) {
		return $self->_error("Stream does not end with newline character");
	}

	# Split the file into lines
	my @lines = grep { ! /^\s*(?:\#.*)?\z/ }
	            split /(?:\015{1,2}\012|\015|\012)/, $string;

	# Strip the initial YAML header
	@lines and $lines[0] =~ /^\%YAML[: ][\d\.]+.*\z/ and shift @lines;

	# A nibbling parser
	while ( @lines ) {
		# Do we have a document header?
		if ( $lines[0] =~ /^---\s*(?:(.+)\s*)?\z/ ) {
			# Handle scalar documents
			shift @lines;
			if ( defined $1 and $1 !~ /^(?:\#.+|\%YAML[: ][\d\.]+)\z/ ) {
				push @$self, $self->_read_scalar( "$1", [ undef ], \@lines );
				next;
			}
		}

		if ( ! @lines or $lines[0] =~ /^(?:---|\.\.\.)/ ) {
			# A naked document
			push @$self, undef;
			while ( @lines and $lines[0] !~ /^---/ ) {
				shift @lines;
			}

		} elsif ( $lines[0] =~ /^\s*\-/ ) {
			# An array at the root
			my $document = [ ];
			push @$self, $document;
			$self->_read_array( $document, [ 0 ], \@lines );

		} elsif ( $lines[0] =~ /^(\s*)\S/ ) {
			# A hash at the root
			my $document = { };
			push @$self, $document;
			$self->_read_hash( $document, [ length($1) ], \@lines );

		} else {
			croak("YAML::Tiny failed to classify the line '$lines[0]'");
		}
	}

	$self;
}

# Deparse a scalar string to the actual scalar
sub _read_scalar {
	my ($self, $string, $indent, $lines) = @_;

	# Trim trailing whitespace
	$string =~ s/\s*\z//;

	# Explitic null/undef
	return undef if $string eq '~';

	# Quotes
	if ( $string =~ /^\'(.*?)\'\z/ ) {
		return '' unless defined $1;
		$string = $1;
		$string =~ s/\'\'/\'/g;
		return $string;
	}
	if ( $string =~ /^\"((?:\\.|[^\"])*)\"\z/ ) {
		# Reusing the variable is a little ugly,
		# but avoids a new variable and a string copy.
		$string = $1;
		$string =~ s/\\"/"/g;
		$string =~ s/\\([never\\fartz]|x([0-9a-fA-F]{2}))/(length($1)>1)?pack("H2",$2):$UNESCAPES{$1}/gex;
		return $string;
	}

	# Special cases
	if ( $string =~ /^[\'\"!&]/ ) {
		croak("YAML::Tiny does not support a feature in line '$lines->[0]'");
	}
	return {} if $string eq '{}';
	return [] if $string eq '[]';

	# Regular unquoted string
	return $string unless $string =~ /^[>|]/;

	# Error
	croak("YAML::Tiny failed to find multi-line scalar content") unless @$lines;

	# Check the indent depth
	$lines->[0]   =~ /^(\s*)/;
	$indent->[-1] = length("$1");
	if ( defined $indent->[-2] and $indent->[-1] <= $indent->[-2] ) {
		croak("YAML::Tiny found bad indenting in line '$lines->[0]'");
	}

	# Pull the lines
	my @multiline = ();
	while ( @$lines ) {
		$lines->[0] =~ /^(\s*)/;
		last unless length($1) >= $indent->[-1];
		push @multiline, substr(shift(@$lines), length($1));
	}

	my $j = (substr($string, 0, 1) eq '>') ? ' ' : "\n";
	my $t = (substr($string, 1, 1) eq '-') ? ''  : "\n";
	return join( $j, @multiline ) . $t;
}

# Parse an array
sub _read_array {
	my ($self, $array, $indent, $lines) = @_;

	while ( @$lines ) {
		# Check for a new document
		if ( $lines->[0] =~ /^(?:---|\.\.\.)/ ) {
			while ( @$lines and $lines->[0] !~ /^---/ ) {
				shift @$lines;
			}
			return 1;
		}

		# Check the indent level
		$lines->[0] =~ /^(\s*)/;
		if ( length($1) < $indent->[-1] ) {
			return 1;
		} elsif ( length($1) > $indent->[-1] ) {
			croak("YAML::Tiny found bad indenting in line '$lines->[0]'");
		}

		if ( $lines->[0] =~ /^(\s*\-\s+)[^\'\"]\S*\s*:(?:\s+|$)/ ) {
			# Inline nested hash
			my $indent2 = length("$1");
			$lines->[0] =~ s/-/ /;
			push @$array, { };
			$self->_read_hash( $array->[-1], [ @$indent, $indent2 ], $lines );

		} elsif ( $lines->[0] =~ /^\s*\-(\s*)(.+?)\s*\z/ ) {
			# Array entry with a value
			shift @$lines;
			push @$array, $self->_read_scalar( "$2", [ @$indent, undef ], $lines );

		} elsif ( $lines->[0] =~ /^\s*\-\s*\z/ ) {
			shift @$lines;
			unless ( @$lines ) {
				push @$array, undef;
				return 1;
			}
			if ( $lines->[0] =~ /^(\s*)\-/ ) {
				my $indent2 = length("$1");
				if ( $indent->[-1] == $indent2 ) {
					# Null array entry
					push @$array, undef;
				} else {
					# Naked indenter
					push @$array, [ ];
					$self->_read_array( $array->[-1], [ @$indent, $indent2 ], $lines );
				}

			} elsif ( $lines->[0] =~ /^(\s*)\S/ ) {
				push @$array, { };
				$self->_read_hash( $array->[-1], [ @$indent, length("$1") ], $lines );

			} else {
				croak("YAML::Tiny failed to classify line '$lines->[0]'");
			}

		} elsif ( defined $indent->[-2] and $indent->[-1] == $indent->[-2] ) {
			# This is probably a structure like the following...
			# ---
			# foo:
			# - list
			# bar: value
			#
			# ... so lets return and let the hash parser handle it
			return 1;

		} else {
			croak("YAML::Tiny failed to classify line '$lines->[0]'");
		}
	}

	return 1;
}

# Parse an array
sub _read_hash {
	my ($self, $hash, $indent, $lines) = @_;

	while ( @$lines ) {
		# Check for a new document
		if ( $lines->[0] =~ /^(?:---|\.\.\.)/ ) {
			while ( @$lines and $lines->[0] !~ /^---/ ) {
				shift @$lines;
			}
			return 1;
		}

		# Check the indent level
		$lines->[0] =~ /^(\s*)/;
		if ( length($1) < $indent->[-1] ) {
			return 1;
		} elsif ( length($1) > $indent->[-1] ) {
			croak("YAML::Tiny found bad indenting in line '$lines->[0]'");
		}

		# Get the key
		unless ( $lines->[0] =~ s/^\s*([^\'\" ][^\n]*?)\s*:(\s+|$)// ) {
			if ( $lines->[0] =~ /^\s*[?\'\"]/ ) {
				croak("YAML::Tiny does not support a feature in line '$lines->[0]'");
			}
			croak("YAML::Tiny 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;
}

# Set error
sub _error {
	$YAML::Tiny::errstr = $_[1];
	undef;
}

# Retrieve error
sub errstr {
	$YAML::Tiny::errstr;
}



#####################################################################
# Use Scalar::Util if possible, otherwise emulate it

BEGIN {
	eval {
		require Scalar::Util;
	};
	if ( $@ ) {
		# Failed to load Scalar::Util
		eval <<'END_PERL';
sub refaddr {
	my $pkg = ref($_[0]) or return undef;
	if (!!UNIVERSAL::can($_[0], 'can')) {
		bless $_[0], 'Scalar::Util::Fake';
	} else {
		$pkg = undef;
	}
	"$_[0]" =~ /0x(\w+)/;
	my $i = do { local $^W; hex $1 };
	bless $_[0], $pkg if defined $pkg;
	$i;
}
END_PERL
	} else {
		Scalar::Util->import('refaddr');
	}
}


#####################################################################
# main test
#####################################################################

package main;

BEGIN {

    # Skip modules that either don't want to be loaded directly, such as
    # Module::Install, or that mess with the test count, such as the Test::*