2 行
25 KiB
JavaScript
2 行
25 KiB
JavaScript
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class AnnotationParser{static get defaultAppearanceAttributes(){return{bgColor:16777215,bgOpacity:.8,fgColor:0,textSize:3.15}}static get attributeMap(){return{type:"tp",style:"s",x:"x",y:"y",width:"w",height:"h",sx:"sx",sy:"sy",timeStart:"ts",timeEnd:"te",text:"t",actionType:"at",actionUrl:"au",actionUrlTarget:"aut",actionSeconds:"as",bgOpacity:"bgo",bgColor:"bgc",fgColor:"fgc",textSize:"txsz"}}deserializeAnnotation(serializedAnnotation){const map=this.constructor.attributeMap;const attributes=serializedAnnotation.split(",");const annotation={};for(const attribute of attributes){const[key,value]=attribute.split("=");const mappedKey=this.getKeyByValue(map,key);let finalValue="";if(["text","actionType","actionUrl","actionUrlTarget","type","style"].indexOf(mappedKey)>-1){finalValue=decodeURIComponent(value)}else{finalValue=parseFloat(value,10)}annotation[mappedKey]=finalValue}return annotation}serializeAnnotation(annotation){const map=this.constructor.attributeMap;let serialized="";for(const key in annotation){const mappedKey=map[key];if(["text","actionType","actionUrl","actionUrlTarget"].indexOf(key)>-1&&mappedKey&&annotation.hasOwnProperty(key)){let text=encodeURIComponent(annotation[key]);serialized+=`${mappedKey}=${text},`}else if(["text","actionType","actionUrl","actionUrlTarget"].indexOf("key")===-1&&mappedKey&&annotation.hasOwnProperty(key)){serialized+=`${mappedKey}=${annotation[key]},`}}return serialized.substring(0,serialized.length-1)}deserializeAnnotationList(serializedAnnotationString){const serializedAnnotations=serializedAnnotationString.split(";");serializedAnnotations.length=serializedAnnotations.length-1;const annotations=[];for(const annotation of serializedAnnotations){annotations.push(this.deserializeAnnotation(annotation))}return annotations}serializeAnnotationList(annotations){let serialized="";for(const annotation of annotations){serialized+=this.serializeAnnotation(annotation)+";"}return serialized}xmlToDom(xml){const parser=new DOMParser;const dom=parser.parseFromString(xml,"application/xml");return dom}getAnnotationsFromXml(xml){const dom=this.xmlToDom(xml);return dom.getElementsByTagName("annotation")}parseYoutubeAnnotationList(annotationElements){const annotations=[];for(const el of annotationElements){const parsedAnnotation=this.parseYoutubeAnnotation(el);if(parsedAnnotation)annotations.push(parsedAnnotation)}return annotations}parseYoutubeAnnotation(annotationElement){const base=annotationElement;const attributes=this.getAttributesFromBase(base);if(!attributes.type||attributes.type==="pause")return null;const text=this.getTextFromBase(base);const action=this.getActionFromBase(base);const backgroundShape=this.getBackgroundShapeFromBase(base);if(!backgroundShape)return null;const timeStart=backgroundShape.timeRange.start;const timeEnd=backgroundShape.timeRange.end;if(isNaN(timeStart)||isNaN(timeEnd)||timeStart===null||timeEnd===null){return null}const appearance=this.getAppearanceFromBase(base);let annotation={type:attributes.type,x:backgroundShape.x,y:backgroundShape.y,width:backgroundShape.width,height:backgroundShape.height,timeStart:timeStart,timeEnd:timeEnd};if(attributes.style)annotation.style=attributes.style;if(text)annotation.text=text;if(action)annotation=Object.assign(action,annotation);if(appearance)annotation=Object.assign(appearance,annotation);if(backgroundShape.hasOwnProperty("sx"))annotation.sx=backgroundShape.sx;if(backgroundShape.hasOwnProperty("sy"))annotation.sy=backgroundShape.sy;return annotation}getBackgroundShapeFromBase(base){const movingRegion=base.getElementsByTagName("movingRegion")[0];if(!movingRegion)return null;const regionType=movingRegion.getAttribute("type");const regions=movingRegion.getElementsByTagName(`${regionType}Region`);const timeRange=this.extractRegionTime(regions);const shape={type:regionType,x:parseFloat(regions[0].getAttribute("x"),10),y:parseFloat(regions[0].getAttribute("y"),10),width:parseFloat(regions[0].getAttribute("w"),10),height:parseFloat(regions[0].getAttribute("h"),10),timeRange:timeRange};const sx=regions[0].getAttribute("sx");const sy
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