@allmaps/iiif-parser/dist/classes/canvas.js

Allmaps IIIF parser

import { EmbeddedImage } from './image.js';
import { parseVersion2String, parseVersion3String, parseVersion2Metadata, filterInvalidMetadata } from '../lib/strings.js';
const CanvasTypeString = 'canvas';
/**
 * Parsed IIIF Canvas
 * @class Canvas
 * @property {string} [uri] - URI of Canvas
 * @property {LanguageString} [label] - Label of Manifest
 * @property {Metadata} [metadata] - Metadata of Manifest
 * @property {EmbeddedImage | Image} [image] - Image of painted on Canvas
 * @property {number} [height] - Height of Canvas
 * @property {number} [width] - Width of Canvas
 * @property {string} [type] - Resource type, equals 'canvas'
 */
export class Canvas {
    uri;
    type = CanvasTypeString;
    height;
    width;
    image;
    label;
    metadata;
    constructor(parsedCanvas) {
        this.width = parsedCanvas.width;
        this.height = parsedCanvas.height;
        if ('@id' in parsedCanvas) {
            // IIIF Presentation API 2.0
            this.uri = parsedCanvas['@id'];
            if (parsedCanvas.label) {
                this.label = parseVersion2String(parsedCanvas.label);
            }
            this.metadata = filterInvalidMetadata(parseVersion2Metadata(parsedCanvas.metadata));
            this.image = new EmbeddedImage(parsedCanvas.images[0].resource, parsedCanvas);
        }
        else if ('id' in parsedCanvas) {
            // IIIF Presentation API 3.0
            this.uri = parsedCanvas.id;
            this.label = parseVersion3String(parsedCanvas.label);
            this.metadata = filterInvalidMetadata(parsedCanvas.metadata);
            const annotationBodyOrBodies = parsedCanvas.items[0].items[0].body;
            let annotationBody;
            if (Array.isArray(annotationBodyOrBodies)) {
                annotationBody = annotationBodyOrBodies[0];
            }
            else {
                annotationBody = annotationBodyOrBodies;
            }
            this.image = new EmbeddedImage(annotationBody, parsedCanvas);
        }
        else {
            throw new Error('Invalid IIIF Canvas');
        }
    }
}