thematic-earth/gcslib/parsers/encoded-parser.class.js

HTML-based, whole-Earth thematic maps using locally hosted data layers

/* Copyright (c) 2023 Read Write Tools. Legal use subject to the Thematic Earth Software License Agreement. */
import GcsPointFeature from'../gcs/gcs-point-feature.class.js';import GcsLineFeature from'../gcs/gcs-line-feature.class.js';import{GcsPolygonFeature}from'../gcs/gcs-polygon-feature.class.js';import{PolygonRing}from'../gcs/gcs-polygon-feature.class.js';import Coords from'../util/coords.class.js';import*as SectionMarker from'../util/section-marker.js';import expect from'../softlib/expect.js';import aver from'../softlib/aver.js';import terminal from'../softlib/terminal.js';export default class EncodedParser{constructor(e,t){expect(e,'GcsHoldingArea'),expect(t,'String'),this.gcsHoldingArea=e,this.gcsFeaturePoints=e.gcsFeaturePoints,this.gcsFeatureLines=e.gcsFeatureLines,this.gcsFeaturePolygons=e.gcsFeaturePolygons,this.indexedCoordinates=e.indexedCoordinates,this.topology=e.topology,this.format=t,this.datasetName='',this.geometryType='',this.propertyNames=[],this.propertyTypes=[],this.numMeridians=0,this.numParallels=0,this.numCoordinates=0,this.numEdges=0,this.numArcs=0,this.arcRefLenBits=0,this.arcIndexLenBits=0,this.coordsIndexLenBits=0,this.numProperties=0,this.numFeatures=0,this.payload=null,this.payloadLength=0,this.payloadOffset=0}parse(e){expect(e,['String','ArrayBuffer']);for(var t=this.readProlog();1==t;)t=this.readPayload();this.gcsHoldingArea.resetIndexedCoordinates(),this.gcsHoldingArea.resetTopology();var r=this.payloadLength-this.payloadOffset;return 0==r||(terminal.abnormal(`Premature end of parsing, ${r} bytes at end of file were not parsed`),!1)}readProlog(e){var t=this.payloadOffset,r=t,s='';switch(this.format){case'gfe':return expect(this.payload,'String'),r=t+SectionMarker.GFE_PROLOG[1].length,s=this.payload.substring(t,r),this.payloadOffset=r+1,this.prologSanityCheck(s,SectionMarker.GFE_PROLOG[1]);case'gfebin':return expect(this.payload,'DataView'),r=t+SectionMarker.GFE_PROLOG[0].length,s=(new TextDecoder).decode(this.payload.buffer.slice(t,r)),this.payloadOffset=r,this.prologSanityCheck(s,SectionMarker.GFE_PROLOG[0]);case'ice':return expect(this.payload,'String'),r=t+SectionMarker.ICE_PROLOG[1].length,s=this.payload.substring(t,r),this.payloadOffset=r+1,this.prologSanityCheck(s,SectionMarker.ICE_PROLOG[1]);case'icebin':return expect(this.payload,'DataView'),r=t+SectionMarker.ICE_PROLOG[0].length,s=(new TextDecoder).decode(this.payload.buffer.slice(t,r)),this.payloadOffset=r,this.prologSanityCheck(s,SectionMarker.ICE_PROLOG[0]);case'tae':return expect(this.payload,'String'),r=t+SectionMarker.TAE_PROLOG[1].length,s=this.payload.substring(t,r),this.payloadOffset=r+1,s==SectionMarker.TAE_PROLOG[2]?(terminal.trace(`This file was created with ${SectionMarker.TAE_PROLOG[2]}`),!1):this.prologSanityCheck(s,SectionMarker.TAE_PROLOG[1]);case'taebin':return expect(this.payload,'DataView'),r=t+SectionMarker.TAE_PROLOG[0].length,s=(new TextDecoder).decode(this.payload.buffer.slice(t,r)),this.payloadOffset=r,this.prologSanityCheck(s,SectionMarker.TAE_PROLOG[0]);default:terminal.logic(`expected 'gfe', 'gfebin', 'ice', 'icebin', 'tae' or 'taebin' but got ${this.format}`)}}prologSanityCheck(e,t){return t==e||(terminal.abnormal(`Expected ${t} but found ${e} while reading package prolog`),!1)}readFeatures(){expect(this.numFeatures,'Number'),aver(this.numFeatures>=0);for(let i=0;i<this.numFeatures;i++){var e=this.createFeature(),t=new Array,r=new Array;for(let i=0;i<this.numProperties;i++){var s=this.propertyNames[i],a=this.propertyTypes[i];try{if(0==this.readFeatureProperties(e,s,a,t,r))return!1}catch(e){return terminal.caught(e),!1}}if(aver(t.length==r.length),'Point'==this.geometryType)e.discretePoint=new Coords(t[0],r[0]);else if('Line'==this.geometryType){aver(t.length==r.length);let s=t.length;for(let a=0;a<s;a++)e.lineSegment.push(new Coords(t[a],r[a]))}else if('Polygon'==this.geometryType){aver(t.length==r.length);let s=t.length;for(let a=0;a<s;a++){aver(t[a].length==r[a].length);let s=t[a].length;if(0==a)for(let a=0;a<s;a++)e.outerRing.push(new Coords(t[0][a],r[0][a]));else{let i=new PolygonRing;for(let e=0;e<s;e++)i.push(new Coords(t[a][e],r[a][e]));e.innerRings.push(i)}}e.closeTheRings()}}return!0}createFeature(){var e=null;switch(this.geometryType){case'Point':e=new GcsPointFeature,this.gcsFeaturePoints.push(e);break;case'Line':e=new GcsLineFeature,this.gcsFeatureLines.push(e);break;case'Polygon':e=new GcsPolygonFeature,this.gcsFeaturePolygons.push(e);break;default:terminal.logic(`unknown geometryType ${this.geometryType}`)}return e}}