/**
 * @author mrdoob / http://mrdoob.com/
 * @author Alex Pletzer
 */

THREE.VTKLoader = function( manager ) {

	this.manager = ( manager !== undefined ) ? manager : THREE.DefaultLoadingManager;

};

Object.assign( THREE.VTKLoader.prototype, THREE.EventDispatcher.prototype, {

	load: function ( url, onLoad, onProgress, onError ) {

		var scope = this;

		var loader = new THREE.XHRLoader( scope.manager );
		loader.setResponseType( 'arraybuffer' );
		loader.load( url, function( text ) {

			onLoad( scope.parse( text ) );

		}, onProgress, onError );

	},

	parse: function ( data ) {

		function parseASCII( data ) {

			// connectivity of the triangles
			var indices = [];

			// triangles vertices
			var positions = [];

			// red, green, blue colors in the range 0 to 1
			var colors = [];

			// normal vector, one per vertex
			var normals = [];

			var result;

			// pattern for reading vertices, 3 floats or integers
			var pat3Floats = /(\-?\d+\.?[\d\-\+e]*)\s+(\-?\d+\.?[\d\-\+e]*)\s+(\-?\d+\.?[\d\-\+e]*)/g;

			// pattern for connectivity, an integer followed by any number of ints
			// the first integer is the number of polygon nodes
			var patConnectivity = /^(\d+)\s+([\s\d]*)/;

			// indicates start of vertex data section
			var patPOINTS = /^POINTS /;

			// indicates start of polygon connectivity section
			var patPOLYGONS = /^POLYGONS /;

			// indicates start of triangle strips section
			var patTRIANGLE_STRIPS = /^TRIANGLE_STRIPS /;

			// POINT_DATA number_of_values
			var patPOINT_DATA = /^POINT_DATA[ ]+(\d+)/;

			// CELL_DATA number_of_polys
			var patCELL_DATA = /^CELL_DATA[ ]+(\d+)/;

			// Start of color section
			var patCOLOR_SCALARS = /^COLOR_SCALARS[ ]+(\w+)[ ]+3/;

			// NORMALS Normals float
			var patNORMALS = /^NORMALS[ ]+(\w+)[ ]+(\w+)/;

			var inPointsSection = false;
			var inPolygonsSection = false;
			var inTriangleStripSection = false;
			var inPointDataSection = false;
			var inCellDataSection = false;
			var inColorSection = false;
			var inNormalsSection = false;

			var lines = data.split( '\n' );

			for ( var i in lines ) {

				var line = lines[ i ];

				if ( inPointsSection ) {

					// get the vertices
					while ( ( result = pat3Floats.exec( line ) ) !== null ) {

						var x = parseFloat( result[ 1 ] );
						var y = parseFloat( result[ 2 ] );
						var z = parseFloat( result[ 3 ] );
						positions.push( x, y, z );

					}

				} else if ( inPolygonsSection ) {

					if ( ( result = patConnectivity.exec( line ) ) !== null ) {

						// numVertices i0 i1 i2 ...
						var numVertices = parseInt( result[ 1 ] );
						var inds = result[ 2 ].split( /\s+/ );

						if ( numVertices >= 3 ) {

							var i0 = parseInt( inds[ 0 ] );
							var i1, i2;
							var k = 1;
							// split the polygon in numVertices - 2 triangles
							for ( var j = 0; j < numVertices - 2; ++ j ) {

								i1 = parseInt( inds[ k ] );
								i2 = parseInt( inds[ k + 1 ] );
								indices.push( i0, i1, i2 );
								k ++;

							}

						}

					}

				} else if ( inTriangleStripSection ) {

					if ( ( result = patConnectivity.exec( line ) ) !== null ) {

						// numVertices i0 i1 i2 ...
						var numVertices = parseInt( result[ 1 ] );
						var inds = result[ 2 ].split( /\s+/ );

						if ( numVertices >= 3 ) {

							var i0, i1, i2;
							// split the polygon in numVertices - 2 triangles
							for ( var j = 0; j < numVertices - 2; j ++ ) {

								if ( j % 2 === 1 ) {

									i0 = parseInt( inds[ j ] );
									i1 = parseInt( inds[ j + 2 ] );
									i2 = parseInt( inds[ j + 1 ] );
									indices.push( i0, i1, i2 );

								} else {

									i0 = parseInt( inds[ j ] );
									i1 = parseInt( inds[ j + 1 ] );
									i2 = parseInt( inds[ j + 2 ] );
									indices.push( i0, i1, i2 );

								}

							}

						}

					}

				} else if ( inPointDataSection || inCellDataSection ) {

					if ( inColorSection ) {

						// Get the colors

						while ( ( result = pat3Floats.exec( line ) ) !== null ) {

							var r = parseFloat( result[ 1 ] );
							var g = parseFloat( result[ 2 ] );
							var b = parseFloat( result[ 3 ] );
							colors.push( r, g, b );

						}

					} else if ( inNormalsSection ) {

						// Get the normal vectors

						while ( ( result = pat3Floats.exec( line ) ) !== null ) {

							var nx = parseFloat( result[ 1 ] );
							var ny = parseFloat( result[ 2 ] );
							var nz = parseFloat( result[ 3 ] );
							normals.push( nx, ny, nz );

						}

					}

				}

				if ( patPOLYGONS.exec( line ) !== null ) {

					inPolygonsSection = true;
					inPointsSection = false;
					inTriangleStripSection = false;

				} else if ( patPOINTS.exec( line ) !== null ) {

					inPolygonsSection = false;
					inPointsSection = true;
					inTriangleStripSection = false;

				} else if ( patTRIANGLE_STRIPS.exec( line ) !== null ) {

					inPolygonsSection = false;
					inPointsSection = false;
					inTriangleStripSection = true;

				} else if ( patPOINT_DATA.exec( line ) !== null ) {

					inPointDataSection = true;
					inPointsSection = false;
					inPolygonsSection = false;
					inTriangleStripSection = false;

				} else if ( patCELL_DATA.exec( line ) !== null ) {

					inCellDataSection = true;
					inPointsSection = false;
					inPolygonsSection = false;
					inTriangleStripSection = false;

				} else if ( patCOLOR_SCALARS.exec( line ) !== null ) {

					inColorSection = true;
					inNormalsSection = false;
					inPointsSection = false;
					inPolygonsSection = false;
					inTriangleStripSection = false;

				} else if ( patNORMALS.exec( line ) !== null ) {

					inNormalsSection = true;
					inColorSection = false;
					inPointsSection = false;
					inPolygonsSection = false;
					inTriangleStripSection = false;

				}

			}

			var geometry;
			var stagger = 'point';

			if ( colors.length == indices.length ) {

				stagger = 'cell';

			}

			if ( stagger == 'point' ) {

				// Nodal. Use BufferGeometry
				geometry = new THREE.BufferGeometry();
				geometry.setIndex( new THREE.BufferAttribute( new Uint32Array( indices ), 1 ) );
				geometry.addAttribute( 'position', new THREE.BufferAttribute( new Float32Array( positions ), 3 ) );

				if ( colors.length == positions.length ) {

					geometry.addAttribute( 'color', new THREE.BufferAttribute( new Float32Array( colors ), 3 ) );

				}

				if ( normals.length == positions.length ) {

					geometry.addAttribute( 'normal', new THREE.BufferAttribute( new Float32Array( normals ), 3 ) );

				}

			} else {

				// Cell centered colors. The only way to attach a solid color to each triangle
				// is to use Geometry, which is less efficient than BufferGeometry
				geometry = new THREE.Geometry();

				var numTriangles = indices.length / 3;
				var numPoints = positions.length / 3;
				var va, vb, vc;
				var face;
				var ia, ib, ic;
				var x, y, z;
				var r, g, b;

				for ( var j = 0; j < numPoints; ++ j ) {

					x = positions[ 3 * j + 0 ];
					y = positions[ 3 * j + 1 ];
					z = positions[ 3 * j + 2 ];
					geometry.vertices.push( new THREE.Vector3( x, y, z ) );

				}

				for ( var i = 0; i < numTriangles; ++ i ) {

					ia = indices[ 3 * i + 0 ];
					ib = indices[ 3 * i + 1 ];
					ic = indices[ 3 * i + 2 ];
					geometry.faces.push( new THREE.Face3( ia, ib, ic ) );

				}

				if ( colors.length == numTriangles * 3 ) {

					for ( var i = 0; i < numTriangles; ++ i ) {

						face = geometry.faces[ i ];
						r = colors[ 3 * i + 0 ];
						g = colors[ 3 * i + 1 ];
						b = colors[ 3 * i + 2 ];
						face.color = new THREE.Color().setRGB( r, g, b );

					}

				}

			}

			return geometry;

		}

		function parseBinary( data ) {

			var count, pointIndex, i, numberOfPoints, pt, s;
			var buffer = new Uint8Array ( data );
			var dataView = new DataView ( data );

			// Points and normals, by default, are empty
			var points = [];
			var normals = [];
			var indices = [];

			// Going to make a big array of strings
			var vtk = [];
			var index = 0;

			function findString( buffer, start ) {

				var index = start;
				var c = buffer[ index ];
				var s = [];
				while ( c != 10 ) {

					s.push ( String.fromCharCode ( c ) );
					index ++;
					c = buffer[ index ];

				}

				return { start: start,
						end: index,
						next: index + 1,
						parsedString: s.join( '' ) };

			}

			var state, line;

			while ( true ) {

				// Get a string
				state = findString ( buffer, index );
				line = state.parsedString;

				if ( line.indexOf ( 'POINTS' ) === 0 ) {

					vtk.push ( line );
					// Add the points
					numberOfPoints = parseInt ( line.split( ' ' )[ 1 ], 10 );

					// Each point is 3 4-byte floats
					count = numberOfPoints * 4 * 3;

					points = new Float32Array( numberOfPoints * 3 );

					pointIndex = state.next;
					for ( i = 0; i < numberOfPoints; i ++ ) {

						points[ 3 * i ] = dataView.getFloat32( pointIndex, false );
						points[ 3 * i + 1 ] = dataView.getFloat32( pointIndex + 4, false );
						points[ 3 * i + 2 ] = dataView.getFloat32( pointIndex + 8, false );
						pointIndex = pointIndex + 12;

					}
					// increment our next pointer
					state.next = state.next + count + 1;

				} else if ( line.indexOf ( 'TRIANGLE_STRIPS' ) === 0 ) {

					var numberOfStrips = parseInt ( line.split( ' ' )[ 1 ], 10 );
					var size = parseInt ( line.split ( ' ' )[ 2 ], 10 );
					// 4 byte integers
					count = size * 4;

					indices = new Uint32Array( 3 * size - 9 * numberOfStrips );
					var indicesIndex = 0;

					pointIndex = state.next;
					for ( i = 0; i < numberOfStrips; i ++ ) {

						// For each strip, read the first value, then record that many more points
						var indexCount = dataView.getInt32( pointIndex, false );
						var strip = [];
						pointIndex += 4;
						for ( s = 0; s < indexCount; s ++ ) {

							strip.push ( dataView.getInt32( pointIndex, false ) );
							pointIndex += 4;

						}

						// retrieves the n-2 triangles from the triangle strip
						for ( var j = 0; j < indexCount - 2; j ++ ) {

							if ( j % 2 ) {

								indices[ indicesIndex ++ ] = strip[ j ];
								indices[ indicesIndex ++ ] = strip[ j + 2 ];
								indices[ indicesIndex ++ ] = strip[ j + 1 ];

							} else {


								indices[ indicesIndex ++ ] = strip[ j ];
								indices[ indicesIndex ++ ] = strip[ j + 1 ];
								indices[ indicesIndex ++ ] = strip[ j + 2 ];

							}

						}

					}
					// increment our next pointer
					state.next = state.next + count + 1;

				} else if ( line.indexOf ( 'POLYGONS' ) === 0 ) {

					var numberOfStrips = parseInt ( line.split( ' ' )[ 1 ], 10 );
					var size = parseInt ( line.split ( ' ' )[ 2 ], 10 );
					// 4 byte integers
					count = size * 4;

					indices = new Uint32Array( 3 * size - 9 * numberOfStrips );
					var indicesIndex = 0;

					pointIndex = state.next;
					for ( i = 0; i < numberOfStrips; i ++ ) {

						// For each strip, read the first value, then record that many more points
						var indexCount = dataView.getInt32( pointIndex, false );
						var strip = [];
						pointIndex += 4;
						for ( s = 0; s < indexCount; s ++ ) {

							strip.push ( dataView.getInt32( pointIndex, false ) );
							pointIndex += 4;

						}
						var i0 = strip[ 0 ];
						// divide the polygon in n-2 triangle
						for ( var j = 1; j < indexCount - 1; j ++ ) {

							indices[ indicesIndex ++ ] = strip[ 0 ];
							indices[ indicesIndex ++ ] = strip[ j ];
							indices[ indicesIndex ++ ] = strip[ j + 1 ];

						}

					}
					// increment our next pointer
					state.next = state.next + count + 1;

				} else if ( line.indexOf ( 'POINT_DATA' ) === 0 ) {

					numberOfPoints = parseInt ( line.split( ' ' )[ 1 ], 10 );

					// Grab the next line
					state = findString ( buffer, state.next );

					// Now grab the binary data
					count = numberOfPoints * 4 * 3;

					normals = new Float32Array( numberOfPoints * 3 );
					pointIndex = state.next;
					for ( i = 0; i < numberOfPoints; i ++ ) {

						normals[ 3 * i ] = dataView.getFloat32( pointIndex, false );
						normals[ 3 * i + 1 ] = dataView.getFloat32( pointIndex + 4, false );
						normals[ 3 * i + 2 ] = dataView.getFloat32( pointIndex + 8, false );
						pointIndex += 12;

					}

					// Increment past our data
					state.next = state.next + count;

				}

				// Increment index
				index = state.next;

				if ( index >= buffer.byteLength ) {

					break;

				}

			}

			var geometry = new THREE.BufferGeometry();
			geometry.setIndex( new THREE.BufferAttribute( indices, 1 ) );
			geometry.addAttribute( 'position', new THREE.BufferAttribute( points, 3 ) );

			if ( normals.length == points.length ) {

				geometry.addAttribute( 'normal', new THREE.BufferAttribute( normals, 3 ) );

			}

			return geometry;

		}

		function parseXML( stringFile ) {

			// Changes XML to JSON, based on https://davidwalsh.name/convert-xml-json

			function xmlToJson( xml ) {

				// Create the return object
				var obj = {};

				if ( xml.nodeType == 1 ) { // element

					// do attributes

					if ( xml.attributes ) {

						if ( xml.attributes.length > 0 ) {

							obj[ 'attributes' ] = {};

							for ( var j = 0; j < xml.attributes.length; j ++ ) {

								var attribute = xml.attributes.item( j );
								obj[ 'attributes' ][ attribute.nodeName ] = attribute.nodeValue.trim();

							}

						}

					}

				} else if ( xml.nodeType == 3 ) { // text

					obj = xml.nodeValue.trim();

				}

				// do children
				if ( xml.hasChildNodes() ) {

					for ( var i = 0; i < xml.childNodes.length; i ++ ) {

						var item = xml.childNodes.item( i );
						var nodeName = item.nodeName;

						if ( typeof( obj[ nodeName ] ) === 'undefined' ) {

							var tmp = xmlToJson( item );

							if ( tmp !== '' ) obj[ nodeName ] = tmp;

						} else {

							if ( typeof( obj[ nodeName ].push ) === 'undefined' ) {

								var old = obj[ nodeName ];
								obj[ nodeName ] = [ old ];

							}

							var tmp = xmlToJson( item );

							if ( tmp !== '' ) obj[ nodeName ].push( tmp );

						}

					}

				}

				return obj;

			}

			// Taken from Base64-js
			function Base64toByteArray( b64 ) {

				var Arr = typeof Uint8Array !== 'undefined' ? Uint8Array : Array;
				var i;
				var lookup = [];
				var revLookup = [];
				var code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
				var len = code.length;

				for ( i = 0; i < len; i ++ ) {

					lookup[ i ] = code[ i ];

				}

				for ( i = 0; i < len; ++ i ) {

					revLookup[ code.charCodeAt( i ) ] = i;

				}

				revLookup[ '-'.charCodeAt( 0 ) ] = 62;
				revLookup[ '_'.charCodeAt( 0 ) ] = 63;

				var j, l, tmp, placeHolders, arr;
				var len = b64.length;

				if ( len % 4 > 0 ) {

					throw new Error( 'Invalid string. Length must be a multiple of 4' );

				}

				placeHolders = b64[ len - 2 ] === '=' ? 2 : b64[ len - 1 ] === '=' ? 1 : 0;
				arr = new Arr( len * 3 / 4 - placeHolders );
				l = placeHolders > 0 ? len - 4 : len;

				var L = 0;

				for ( i = 0, j = 0; i < l; i += 4, j += 3 ) {

					tmp = ( revLookup[ b64.charCodeAt( i ) ] << 18 ) | ( revLookup[ b64.charCodeAt( i + 1 ) ] << 12 ) | ( revLookup[ b64.charCodeAt( i + 2 ) ] << 6 ) | revLookup[ b64.charCodeAt( i + 3 ) ];
					arr[ L ++ ] = ( tmp & 0xFF0000 ) >> 16;
					arr[ L ++ ] = ( tmp & 0xFF00 ) >> 8;
					arr[ L ++ ] = tmp & 0xFF;

				}

				if ( placeHolders === 2 ) {

					tmp = ( revLookup[ b64.charCodeAt( i ) ] << 2 ) | ( revLookup[ b64.charCodeAt( i + 1 ) ] >> 4 );
					arr[ L ++ ] = tmp & 0xFF;

				} else if ( placeHolders === 1 ) {

					tmp = ( revLookup[ b64.charCodeAt( i ) ] << 10 ) | ( revLookup[ b64.charCodeAt( i + 1 ) ] << 4 ) | ( revLookup[ b64.charCodeAt( i + 2 ) ] >> 2 );
					arr[ L ++ ] = ( tmp >> 8 ) & 0xFF;
					arr[ L ++ ] = tmp & 0xFF;

				}

				return arr;

			}

			function parseDataArray( ele, compressed ) {

				// Check the format

				if ( ele.attributes.format == 'binary' ) {

					if ( compressed ) {

						// Split the blob_header and compressed Data
						if ( ele[ '#text' ].indexOf( '==' ) != - 1 ) {

							var data = ele[ '#text' ].split( '==' );

							// console.log( data );

							if ( data.length == 2 ) {

								var blob = data.shift();
								var content = data.shift();

								if ( content === '' ) {

									content = blob + '==';

								}

							} else if ( data.length > 2 ) {

								var blob = data.shift();
								var content = data.shift();
								content = content + '==';

							} else if ( data.length < 2 ) {

								var content = data.shift();
								content = content + '==';

							}

							// Convert to bytearray
							var arr = Base64toByteArray( content );

							// decompress
							var inflate = new Zlib.Inflate( arr, { resize: true, verify: true } );
							var content = inflate.decompress();

						} else {

							var content = Base64toByteArray( ele[ '#text' ] );

						}

					} else {

						var content = Base64toByteArray( ele[ '#text' ] );

					}

					var content = content.buffer;

				} else {

					if ( ele[ '#text' ] ) {

						var content = ele[ '#text' ].replace( /\n/g, ' ' ).split( ' ' ).filter( function ( el, idx, arr ) {

							if ( el !== '' ) return el;

						} );

					} else {

						var content = new Int32Array( 0 ).buffer;

					}

				}

				delete ele[ '#text' ];

				// Get the content and optimize it

				if ( ele.attributes.type == 'Float32' ) {

					var txt = new Float32Array( content );

					if ( ele.attributes.format == 'binary' ) {

						if ( ! compressed ) {

							txt = txt.filter( function( el, idx, arr ) {

								if ( idx !== 0 ) return true;

							} );

						}

					}

				} else if ( ele.attributes.type === 'Int64' ) {

					var txt = new Int32Array( content );

					if ( ele.attributes.format == 'binary' ) {

						if ( ! compressed ) {

							txt = txt.filter( function ( el, idx, arr ) {

								if ( idx !== 0 ) return true;

							} );

						}

						txt = txt.filter( function ( el, idx, arr ) {

							if ( idx % 2 !== 1 ) return true;

						} );

					}

				}

				// console.log( txt );

				return txt;

			}

			// Main part
			// Get Dom
			var dom = null;

			if ( window.DOMParser ) {

				try {

					dom = ( new DOMParser() ).parseFromString( stringFile, 'text/xml' );

				} catch ( e ) {

					dom = null;

				}

			} else if ( window.ActiveXObject ) {

				try {

					dom = new ActiveXObject( 'Microsoft.XMLDOM' );
					dom.async = false;

					if ( ! dom.loadXML( xml ) ) {

						throw new Error( dom.parseError.reason + dom.parseError.srcText );

					}

				} catch ( e ) {

					dom = null;

				}

			} else {

				throw new Error( 'Cannot parse xml string!' );

			}

			// Get the doc
			var doc = dom.documentElement;
			// Convert to json
			var json = xmlToJson( doc );
			var points = [];
			var normals = [];
			var indices = [];

			if ( json.PolyData ) {

				var piece = json.PolyData.Piece;
				var compressed = json.attributes.hasOwnProperty( 'compressor' );

				// Can be optimized
				// Loop through the sections
				var sections = [ 'PointData', 'Points', 'Strips', 'Polys' ];// +['CellData', 'Verts', 'Lines'];
				var sectionIndex = 0, numberOfSections = sections.length;

				while ( sectionIndex < numberOfSections ) {

					var section = piece[ sections[ sectionIndex ] ];

					// If it has a DataArray in it

					if ( section.DataArray ) {

						// Depending on the number of DataArrays

						if ( Object.prototype.toString.call( section.DataArray ) === '[object Array]' ) {

							var arr = section.DataArray;

						} else {

							var arr = [ section.DataArray ];

						}

						var dataArrayIndex = 0, numberOfDataArrays = arr.length;

						while ( dataArrayIndex < numberOfDataArrays ) {

							// Parse the DataArray
							arr[ dataArrayIndex ].text = parseDataArray( arr[ dataArrayIndex ], compressed );
							dataArrayIndex ++;

						}

						switch ( sections[ sectionIndex ] ) {

							// if iti is point data
							case 'PointData':

								var numberOfPoints = parseInt( piece.attributes.NumberOfPoints );
								var normalsName = section.attributes.Normals;

								if ( numberOfPoints > 0 ) {

									for ( var i = 0, len = arr.length; i < len; i ++ ) {

										if ( normalsName == arr[ i ].attributes.Name ) {

											var components = arr[ i ].attributes.NumberOfComponents;
											normals = new Float32Array( numberOfPoints * components );
											normals.set( arr[ i ].text, 0 );

										}

									}

								}

								// console.log('Normals', normals);

								break;

							// if it is points
							case 'Points':

								var numberOfPoints = parseInt( piece.attributes.NumberOfPoints );

								if ( numberOfPoints > 0 ) {

									var components = section.DataArray.attributes.NumberOfComponents;
									points = new Float32Array( numberOfPoints * components );
									points.set( section.DataArray.text, 0 );

								}

								// console.log('Points', points);

								break;

							// if it is strips
							case 'Strips':

								var numberOfStrips = parseInt( piece.attributes.NumberOfStrips );

								if ( numberOfStrips > 0 ) {

									var connectivity = new Int32Array( section.DataArray[ 0 ].text.length );
									var offset = new Int32Array( section.DataArray[ 1 ].text.length );
									connectivity.set( section.DataArray[ 0 ].text, 0 );
									offset.set( section.DataArray[ 1 ].text, 0 );

									var size = numberOfStrips + connectivity.length;
									indices = new Uint32Array( 3 * size - 9 * numberOfStrips );

									var indicesIndex = 0;

									for ( var i = 0,len = numberOfStrips; i < len; i ++ ) {

										var strip = [];

										for ( var s = 0, len1 = offset[ i ], len0 = 0; s < len1 - len0; s ++ ) {

											strip.push ( connectivity[ s ] );

											if ( i > 0 ) len0 = offset[ i - 1 ];

										}

										for ( var j = 0, len1 = offset[ i ], len0 = 0; j < len1 - len0 - 2; j ++ ) {

											if ( j % 2 ) {

												indices[ indicesIndex ++ ] = strip[ j ];
												indices[ indicesIndex ++ ] = strip[ j + 2 ];
												indices[ indicesIndex ++ ] = strip[ j + 1 ];

											} else {

												indices[ indicesIndex ++ ] = strip[ j ];
												indices[ indicesIndex ++ ] = strip[ j + 1 ];
												indices[ indicesIndex ++ ] = strip[ j + 2 ];

											}

											if ( i > 0 ) len0 = offset[ i - 1 ];

										}

									}

								}

								//console.log('Strips', indices);

								break;

							// if it is polys
							case 'Polys':

								var numberOfPolys = parseInt( piece.attributes.NumberOfPolys );

								if ( numberOfPolys > 0 ) {

									var connectivity = new Int32Array( section.DataArray[ 0 ].text.length );
									var offset = new Int32Array( section.DataArray[ 1 ].text.length );
									connectivity.set( section.DataArray[ 0 ].text, 0 );
									offset.set( section.DataArray[ 1 ].text, 0 );

									var size = numberOfPolys + connectivity.length;
									indices = new Uint32Array( 3 * size - 9 * numberOfPolys );
									var indicesIndex = 0, connectivityIndex = 0;
									var i = 0,len = numberOfPolys, len0 = 0;

									while ( i < len ) {

										var poly = [];
										var s = 0, len1 = offset[ i ];

										while ( s < len1 - len0 ) {

											poly.push( connectivity[ connectivityIndex ++ ] );
											s ++;

										}

										var j = 1;

										while ( j < len1 - len0 - 1 ) {

											indices[ indicesIndex ++ ] = poly[ 0 ];
											indices[ indicesIndex ++ ] = poly[ j ];
											indices[ indicesIndex ++ ] = poly[ j + 1 ];
											j ++;

										}

										i ++;
										len0 = offset[ i - 1 ];

									}

								}
								//console.log('Polys', indices);
								break;

							default:
								break;

						}

					}

					sectionIndex ++;

				}

				var geometry = new THREE.BufferGeometry();
				geometry.setIndex( new THREE.BufferAttribute( indices, 1 ) );
				geometry.addAttribute( 'position', new THREE.BufferAttribute( points, 3 ) );

				if ( normals.length == points.length ) {

					geometry.addAttribute( 'normal', new THREE.BufferAttribute( normals, 3 ) );

				}

				// console.log( json );

				return geometry;

			} else {

				// TODO for vtu,vti,and other xml formats

			}

		}

		function getStringFile( data ) {

			var stringFile = '';
			var charArray = new Uint8Array( data );
			var i = 0;
			var len = charArray.length;

			while ( len -- ) {

				stringFile += String.fromCharCode( charArray[ i ++ ] );

			}

			return stringFile;

		}

		// get the 5 first lines of the files to check if there is the key word binary
		var meta = String.fromCharCode.apply( null, new Uint8Array( data, 0, 250 ) ).split( '\n' );

		if ( meta[ 0 ].indexOf( 'xml' ) !== - 1 ) {

			return parseXML( getStringFile( data ) );

		} else if ( meta[ 2 ].includes( 'ASCII' ) ) {

			return parseASCII( getStringFile( data ) );

		} else {

			return parseBinary( data );

		}

	}

} );
