rxdb
Version:
A local-first realtime NoSQL Database for JavaScript applications - https://rxdb.info/
42 lines (40 loc) • 1.27 kB
JavaScript
/**
* Parses the full revision.
* Do NOT use this if you only need the revision height,
* then use getHeightOfRevision() instead which is faster.
*/
export function parseRevision(revision) {
var split = revision.split('-');
if (split.length !== 2) {
throw new Error('malformatted revision: ' + revision);
}
return {
height: parseInt(split[0], 10),
hash: split[1]
};
}
/**
* @hotPath Performance is very important here
* because we need to parse the revision height very often.
* Do not use `parseInt(revision.split('-')[0], 10)` because
* only fetching the start-number chars is faster.
*/
export function getHeightOfRevision(revision) {
var useChars = '';
for (var index = 0; index < revision.length; index++) {
var char = revision[index];
if (char === '-') {
return parseInt(useChars, 10);
}
useChars += char;
}
throw new Error('malformatted revision: ' + revision);
}
/**
* Creates the next write revision for a given document.
*/
export function createRevision(databaseInstanceToken, previousDocData) {
var newRevisionHeight = !previousDocData ? 1 : getHeightOfRevision(previousDocData._rev) + 1;
return newRevisionHeight + '-' + databaseInstanceToken;
}
//# sourceMappingURL=utils-revision.js.map