json-joy/esm/json-crdt-extensions/peritext/slice/schema.js

Collection of libraries for building collaborative editing apps.

import { compare, s } from '../../../json-crdt-patch';
import { SliceHeaderShift } from './constants';
export const type = (sliceType) => Array.isArray(sliceType) ? s.arr(sliceType.map(step)) : s.con(sliceType);
export const step = (sliceStep) => {
    if (Array.isArray(sliceStep)) {
        const tuple = [s.con(sliceStep[0])];
        const length = sliceStep.length;
        if (length > 1)
            tuple.push(s.con(+(sliceStep[1] ?? 0)));
        if (length > 2)
            tuple.push(s.json(sliceStep[2] ?? {}));
        return s.vec(...tuple);
    }
    return s.con(sliceStep);
};
export const slice = (range, stacking, sliceType, data) => {
    const { start, end } = range;
    const header = (stacking << SliceHeaderShift.Stacking) +
        ((start.anchor & 0b1) << SliceHeaderShift.X1Anchor) +
        ((end.anchor & 0b1) << SliceHeaderShift.X2Anchor);
    const elements = [
        s.con(header),
        s.con(start.id),
        s.con(!compare(start.id, end.id) ? 0 : end.id),
        type(sliceType),
    ];
    if (data !== void 0)
        elements.push(s.json(data));
    return s.vec(...elements);
};
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