93 lines
2.0 KiB
JavaScript
93 lines
2.0 KiB
JavaScript
import WebAnnotation from '../WebAnnotation';
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import { v4 as uuid } from 'uuid';
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import * as equals from 'fast-deep-equal';
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/**
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* An "annotation in draft mode". Really the same
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* data structure, but as a separate class so we can
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* tell things apart properly.
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*/
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export default class Selection {
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constructor(target, body) {
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this.underlying = {
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type: 'Selection',
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body: body || [],
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target
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}
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}
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/** Creates a copy of this selection **/
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clone = opt_props => {
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// Deep-clone target
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const clonedTarget = JSON.parse(JSON.stringify(this.underlying.target));
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const cloned = new Selection(clonedTarget);
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if (opt_props)
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cloned.underlying = { ...cloned.underlying, ...opt_props };
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return cloned;
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}
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get type() {
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return this.underlying.type;
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}
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get body() {
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return this.underlying.body;
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}
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get target() {
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return this.underlying.target;
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}
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/** For consistency with WebAnnotation **/
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isEqual(other) {
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if (!other) {
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return false;
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} else {
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return equals(this.underlying, other.underlying);
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}
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}
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get bodies() {
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return (Array.isArray(this.underlying.body)) ?
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this.underlying.body : [ this.underlying.body ];
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}
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selector = type => {
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const { target } = this.underlying;
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if (target.selector) {
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// Normalize to array
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const selectors = Array.isArray(target.selector) ?
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target.selector : [ target.selector ];
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return selectors.find(s => s.type === type);
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}
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}
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/** Shorthand for the 'exact' field of the TextQuoteSelector **/
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get quote() {
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return this.selector('TextQuoteSelector').exact;
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}
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/*******************************************/
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/* Selection-specific properties & methods */
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/*******************************************/
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get isSelection() {
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return true;
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}
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toAnnotation = () => {
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const a = Object.assign({}, this.underlying, {
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'@context': 'http://www.w3.org/ns/anno.jsonld',
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'type': 'Annotation',
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'id': `#${uuid()}`
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});
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return new WebAnnotation(a);
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}
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} |