text: import {
  	BufferGeometry,
  	Euler,
  	FileLoader,
  	Float32BufferAttribute,
  	Group,
  	LineBasicMaterial,
  	LineSegments,
  	Loader
  } from '../.././build/three.module.js';
  
  /**
   * GCodeLoader is used to load gcode files usually used for 3D printing or CNC applications.
   *
   * Gcode files are composed by commands used by machines to create objects.
   *
   * @class GCodeLoader
   * @param {Manager} manager Loading manager.
   */
  
  class GCodeLoader extends Loader {
  
  	constructor( manager ) {
  
  		super( manager );
  
  		this.splitLayer = false;
  
  	}
  
  	load( url, onLoad, onProgress, onError ) {
  
  		const scope = this;
  
  		const loader = new FileLoader( scope.manager );
  		loader.setPath( scope.path );
  		loader.setRequestHeader( scope.requestHeader );
  		loader.setWithCredentials( scope.withCredentials );
  		loader.load( url, function ( text ) {
  
  			try {
  
  				onLoad( scope.parse( text ) );
  
  			} catch ( e ) {
  
  				if ( onError ) {
  
  					onError( e );
  
  				} else {
  
  					console.error( e );
  
  				}
  
  				scope.manager.itemError( url );
  
  			}
  
  		}, onProgress, onError );
  
  	}
  
  	parse( data ) {
  
  		let state = { x: 0, y: 0, z: 0, e: 0, f: 0, extruding: false, relative: false };
  		let layers = [];
  
  		let currentLayer = undefined;
  
  		const pathMaterial = new LineBasicMaterial( { color: 0xFF0000 } );
  		pathMaterial.name = 'path';
  
  		const extrudingMaterial = new LineBasicMaterial( { color: 0x00FF00 } );
  		extrudingMaterial.name = 'extruded';
  
  		function newLayer( line ) {
  
  			currentLayer = { vertex: [], pathVertex: [], z: line.z };
  			layers.push( currentLayer );
  
  		}
  
  		//Create lie segment between p1 and p2
  		function addSegment( p1, p2 ) {
  
  			if ( currentLayer === undefined ) {
  
  				newLayer( p1 );
  
  			}
  
  			if ( state.extruding ) {
  
  				currentLayer.vertex.push( p1.x, p1.y, p1.z );
  				currentLayer.vertex.push( p2.x, p2.y, p2.z );
  
  			} else {
  
  				currentLayer.pathVertex.push( p1.x, p1.y, p1.z );
  				currentLayer.pathVertex.push( p2.x, p2.y, p2.z );
  
  			}
  
  		}
  
  		function delta( v1, v2 ) {
  
  			return state.relative ? v2 : v2 - v1;
  
  		}
  
  		function absolute( v1, v2 ) {
  
  			return state.relative ? v1 + v2 : v2;
  
  		}
  
  		let lines = data.replace( /;.+/g, '' ).split( '\n' );
  
  		for ( let i = 0; i < lines.length; i ++ ) {
  
  			let tokens = lines[ i ].split( ' ' );
  			let cmd = tokens[ 0 ].toUpperCase();
  
  			//Argumments
  			let args = {};
  			tokens.splice( 1 ).forEach( function ( token ) {
  
  				if ( token[ 0 ] !== undefined ) {
  
  					let key = token[ 0 ].toLowerCase();
  					let value = parseFloat( token.substring( 1 ) );
  					args[ key ] = value;
  
  				}
  
  			} );
  
  			//Process commands
  			//G0/G1 – Linear Movement
  			if ( cmd === 'G0' || cmd === 'G1' ) {
  
  				let line = {
  					x: args.x !== undefined ? absolute( state.x, args.x ) : state.x,
  					y: args.y !== undefined ? absolute( state.y, args.y ) : state.y,
  					z: args.z !== undefined ? absolute( state.z, args.z ) : state.z,
  					e: args.e !== undefined ? absolute( state.e, args.e ) : state.e,
  					f: args.f !== undefined ? absolute( state.f, args.f ) : state.f,
  				};
  
  				//Layer change detection is or made by watching Z, it's made by watching when we extrude at a new Z position
  				if ( delta( state.e, line.e ) > 0 ) {
  
  					line.extruding = delta( state.e, line.e ) > 0;
  
  					if ( currentLayer == undefined || line.z != currentLayer.z ) {
  
  						newLayer( line );
  
  					}
  
  				}
  
  				addSegment( state, line );
  				state = line;
  
  			} else if ( cmd === 'G2' || cmd === 'G3' ) {
  
  				//G2/G3 - Arc Movement ( G2 clock wise and G3 counter clock wise )
  				//console.warn( 'THREE.GCodeLoader: Arc command not supported' );
  
  			} else if ( cmd === 'G90' ) {
  
  				//G90: Set to Absolute Positioning
  				state.relative = false;
  
  			} else if ( cmd === 'G91' ) {
  
  				//G91: Set to state.relative Positioning
  				state.relative = true;
  
  			} else if ( cmd === 'G92' ) {
  
  				//G92: Set Position
  				let line = state;
  				line.x = args.x !== undefined ? args.x : line.x;
  				line.y = args.y !== undefined ? args.y : line.y;
  				line.z = args.z !== undefined ? args.z : line.z;
  				line.e = args.e !== undefined ? args.e : line.e;
  				state = line;
  
  			} else {
  
  				//console.warn( 'THREE.GCodeLoader: Command not supported:' + cmd );
  
  			}
  
  		}
  
  		function addObject( vertex, extruding, i ) {
  
  			let geometry = new BufferGeometry();
  			geometry.setAttribute( 'position', new Float32BufferAttribute( vertex, 3 ) );
  			let segments = new LineSegments( geometry, extruding ? extrudingMaterial : pathMaterial );
  			segments.name = 'layer' + i;
  			object.add( segments );
  
  		}
  
  		const object = new Group();
  		object.name = 'gcode';
  
  		if ( this.splitLayer ) {
  
  			for ( let i = 0; i < layers.length; i ++ ) {
  
  				let layer = layers[ i ];
  				addObject( layer.vertex, true, i );
  				addObject( layer.pathVertex, false, i );
  
  			}
  
  		} else {
  
  			const vertex = [],
  				pathVertex = [];
  
  			for ( let i = 0; i < layers.length; i ++ ) {
  
  				let layer = layers[ i ];
  				let layerVertex = layer.vertex;
  				let layerPathVertex = layer.pathVertex;
  
  				for ( let j = 0; j < layerVertex.length; j ++ ) {
  
  					vertex.push( layerVertex[ j ] );
  
  				}
  
  				for ( let j = 0; j < layerPathVertex.length; j ++ ) {
  
  					pathVertex.push( layerPathVertex[ j ] );
  
  				}
  
  			}
  
  			addObject( vertex, true, layers.length );
  			addObject( pathVertex, false, layers.length );
  
  		}
  
  		object.quaternion.setFromEuler( new Euler( - Math.PI / 2, 0, 0 ) );
  
  		return object;
  
  	}
  
  }
  
  export { GCodeLoader };
  