@orbitdb/ordered-keyvalue-db/dist/utils.js

Ordered keyvalue database type for orbit-db.

export const getScalePosition = ({ entries, key, position, }) => {
    // Firstly, sort entries by position
    entries = entries.sort((a, b) => a.position - b.position);
    // Negative values mean insert from end of list.
    if (position < 0)
        position = entries.length - (position + 1);
    // Find any previous position
    const previousPosition = entries.findIndex((x) => x.key === key);
    // If we are moving upwards, need to add 1 to adjust for the now-deleted slot where our entry used to be
    if (previousPosition !== -1 && position > previousPosition)
        position = position + 1;
    // Calculate scale positions of previous and next entries, if they exist
    const previousScalePosition = entries[Math.min(position, entries.length) - 1]?.position;
    const nextScalePosition = entries[Math.max(position, 0)]?.position;
    // Insert to beginning of list if there is no preceding entry
    // Note: use Math.random() rather to reduce risk of collisions in concurrent edits
    if (previousScalePosition === undefined)
        return nextScalePosition === undefined
            ? Math.random()
            : nextScalePosition - Math.random();
    // Insert to end of list if there is no following entry, or somewhere between adjacent entries
    return nextScalePosition === undefined
        ? previousScalePosition + Math.random()
        : previousScalePosition +
            (nextScalePosition - previousScalePosition) * Math.random();
};
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