igv_component/node_modules/apache-arrow/io/whatwg/iterable.js

"use strict";
// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you 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.
Object.defineProperty(exports, "__esModule", { value: true });
exports.toDOMStream = void 0;
const tslib_1 = require("tslib");
const buffer_js_1 = require("../../util/buffer.js");
const compat_js_1 = require("../../util/compat.js");
/** @ignore */
function toDOMStream(source, options) {
    if ((0, compat_js_1.isAsyncIterable)(source)) {
        return asyncIterableAsReadableDOMStream(source, options);
    }
    if ((0, compat_js_1.isIterable)(source)) {
        return iterableAsReadableDOMStream(source, options);
    }
    /* istanbul ignore next */
    throw new Error(`toDOMStream() must be called with an Iterable or AsyncIterable`);
}
exports.toDOMStream = toDOMStream;
/** @ignore */
function iterableAsReadableDOMStream(source, options) {
    let it = null;
    const bm = ((options === null || options === void 0 ? void 0 : options.type) === 'bytes') || false;
    const hwm = (options === null || options === void 0 ? void 0 : options.highWaterMark) || (Math.pow(2, 24));
    return new ReadableStream(Object.assign(Object.assign({}, options), { start(controller) { next(controller, it || (it = source[Symbol.iterator]())); },
        pull(controller) { it ? (next(controller, it)) : controller.close(); },
        cancel() { ((it === null || it === void 0 ? void 0 : it.return) && it.return() || true) && (it = null); } }), Object.assign({ highWaterMark: bm ? hwm : undefined }, options));
    function next(controller, it) {
        let buf;
        let r = null;
        let size = controller.desiredSize || null;
        while (!(r = it.next(bm ? size : null)).done) {
            if (ArrayBuffer.isView(r.value) && (buf = (0, buffer_js_1.toUint8Array)(r.value))) {
                size != null && bm && (size = size - buf.byteLength + 1);
                r.value = buf;
            }
            controller.enqueue(r.value);
            if (size != null && --size <= 0) {
                return;
            }
        }
        controller.close();
    }
}
/** @ignore */
function asyncIterableAsReadableDOMStream(source, options) {
    let it = null;
    const bm = ((options === null || options === void 0 ? void 0 : options.type) === 'bytes') || false;
    const hwm = (options === null || options === void 0 ? void 0 : options.highWaterMark) || (Math.pow(2, 24));
    return new ReadableStream(Object.assign(Object.assign({}, options), { start(controller) {
            return tslib_1.__awaiter(this, void 0, void 0, function* () { yield next(controller, it || (it = source[Symbol.asyncIterator]())); });
        },
        pull(controller) {
            return tslib_1.__awaiter(this, void 0, void 0, function* () { it ? (yield next(controller, it)) : controller.close(); });
        },
        cancel() {
            return tslib_1.__awaiter(this, void 0, void 0, function* () { ((it === null || it === void 0 ? void 0 : it.return) && (yield it.return()) || true) && (it = null); });
        } }), Object.assign({ highWaterMark: bm ? hwm : undefined }, options));
    function next(controller, it) {
        return tslib_1.__awaiter(this, void 0, void 0, function* () {
            let buf;
            let r = null;
            let size = controller.desiredSize || null;
            while (!(r = yield it.next(bm ? size : null)).done) {
                if (ArrayBuffer.isView(r.value) && (buf = (0, buffer_js_1.toUint8Array)(r.value))) {
                    size != null && bm && (size = size - buf.byteLength + 1);
                    r.value = buf;
                }
                controller.enqueue(r.value);
                if (size != null && --size <= 0) {
                    return;
                }
            }
            controller.close();
        });
    }
}

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