molstar
Version:
A comprehensive macromolecular library.
77 lines • 2.82 kB
JavaScript
/**
* Copyright (c) 2018 mol* contributors, licensed under MIT, See LICENSE file for more info.
*
* @author David Sehnal <david.sehnal@gmail.com>
*/
import { sort, arraySwap } from './sort';
function sortAsc(bs, i, j) { return bs[i].key < bs[j].key ? -1 : 1; }
function _makeBuckets(indices, getKey, sortBuckets, start, end) {
var buckets = new Map();
var bucketList = [];
var prevKey = getKey(indices[0]);
var isBucketed = true;
for (var i = start; i < end; i++) {
var key = getKey(indices[i]);
if (buckets.has(key)) {
buckets.get(key).count++;
if (prevKey !== key)
isBucketed = false;
}
else {
var bucket = { key: key, count: 1, offset: i };
buckets.set(key, bucket);
bucketList[bucketList.length] = bucket;
}
prevKey = key;
}
var bucketOffsets = new Int32Array(bucketList.length + 1);
bucketOffsets[bucketList.length] = end;
var sorted = true;
if (sortBuckets) {
for (var i = 1, _i = bucketList.length; i < _i; i++) {
if (bucketList[i - 1].key > bucketList[i].key) {
sorted = false;
break;
}
}
}
if (isBucketed && sorted) {
for (var i = 0; i < bucketList.length; i++)
bucketOffsets[i] = bucketList[i].offset;
return bucketOffsets;
}
if (sortBuckets && !sorted) {
sort(bucketList, 0, bucketList.length, sortAsc, arraySwap);
}
var offset = 0;
for (var i = 0; i < bucketList.length; i++) {
var b = bucketList[i];
b.offset = offset;
offset += b.count;
}
var reorderedIndices = new Int32Array(end - start);
for (var i = start; i < end; i++) {
var key = getKey(indices[i]);
var bucket = buckets.get(key);
reorderedIndices[bucket.offset++] = indices[i];
}
for (var i = 0, _i = reorderedIndices.length; i < _i; i++) {
indices[i + start] = reorderedIndices[i];
}
bucketOffsets[0] = start;
for (var i = 1; i < bucketList.length; i++)
bucketOffsets[i] = bucketList[i - 1].offset + start;
return bucketOffsets;
}
/**
* Reorders indices so that the same keys are next to each other, [start, end)
* Returns the offsets of buckets. So that [offsets[i], offsets[i + 1]) determines the range.
*/
export function makeBuckets(indices, getKey, options) {
var s = (options && options.start) || 0;
var e = (options && options.end) || indices.length;
if (e - s <= 0)
throw new Error('Can only bucket non-empty collections.');
return _makeBuckets(indices, getKey, !!(options && options.sort), s, e);
}
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