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/**
* This class handles the annotation frame range values for multiframes.
* Mostly used for the Video viewport, it allows references to
* a range of frame values.
*/
export default class FrameRange {
protected static frameRangeExtractor =
/(\/frames\/|[&?]frameNumber=)([^/&?]*)/i;
/**
* This method will extract a single frame number or range of frame numbers
* from a multiframe image id containing a frame range.
*/
protected static imageIdToFrames(imageId: string): FramesRange {
const match = imageId.match(this.frameRangeExtractor);
if (!match || !match[2]) {
return null;
}
const range = match[2].split('-').map((it) => Number(it));
if (range.length === 1) {
return range[0];
}
return range as FramesRange;
}
public static imageIdToFrameEnd(imageId: string): number {
const range = this.imageIdToFrames(imageId);
return Array.isArray(range) ? range[1] : range;
}
public static imageIdToFrameStart(imageId: string): number {
const range = this.imageIdToFrames(imageId);
return Array.isArray(range) ? range[0] : range;
}
/**
* @returns A string range or single value representation of a range array
* or single instance image.
*/
public static framesToString(range) {
if (Array.isArray(range)) {
return `${range[0]}-${range[1]}`;
}
return String(range);
}
/** Applies the range string to the given image id as a frame range. */
protected static framesToImageId(
imageId: string,
range: FramesRange | string
): string {
const match = imageId.match(this.frameRangeExtractor);
if (!match || !match[2]) {
return null;
}
const newRangeString = this.framesToString(range);
return imageId.replace(
this.frameRangeExtractor,
`${match[1]}${newRangeString}`
);
}
}
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