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/**
* Copyright 2023 Google Inc. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import {JSHandle} from '../api/JSHandle.js';
import {AwaitableIterable, HandleFor} from './types.js';
const DEFAULT_BATCH_SIZE = 20;
/**
* This will transpose an iterator JSHandle into a fast, Puppeteer-side iterator
* of JSHandles.
*
* @param size - The number of elements to transpose. This should be something
* reasonable.
*/
async function* fastTransposeIteratorHandle<T>(
iterator: JSHandle<AwaitableIterator<T>>,
size: number
) {
const array = await iterator.evaluateHandle(async (iterator, size) => {
const results = [];
while (results.length < size) {
const result = await iterator.next();
if (result.done) {
break;
}
results.push(result.value);
}
return results;
}, size);
const properties = (await array.getProperties()) as Map<string, HandleFor<T>>;
await array.dispose();
yield* properties.values();
return properties.size === 0;
}
/**
* This will transpose an iterator JSHandle in batches based on the default size
* of {@link fastTransposeIteratorHandle}.
*/
async function* transposeIteratorHandle<T>(
iterator: JSHandle<AwaitableIterator<T>>
) {
let size = DEFAULT_BATCH_SIZE;
try {
while (!(yield* fastTransposeIteratorHandle(iterator, size))) {
size <<= 1;
}
} finally {
await iterator.dispose();
}
}
type AwaitableIterator<T> = Iterator<T> | AsyncIterator<T>;
/**
* @internal
*/
export async function* transposeIterableHandle<T>(
handle: JSHandle<AwaitableIterable<T>>
): AsyncIterableIterator<HandleFor<T>> {
yield* transposeIteratorHandle(
await handle.evaluateHandle(iterable => {
return (async function* () {
yield* iterable;
})();
})
);
}
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