1 | ;
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2 | Object.defineProperty(exports, "__esModule", { value: true });
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3 | /*-----------------------------------------------------------------------------
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4 | | Copyright (c) 2014-2017, PhosphorJS Contributors
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5 | |
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6 | | Distributed under the terms of the BSD 3-Clause License.
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7 | |
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8 | | The full license is in the file LICENSE, distributed with this software.
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9 | |----------------------------------------------------------------------------*/
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10 | var iter_1 = require("./iter");
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11 | /**
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12 | * Chain together several iterables.
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13 | *
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14 | * @param objects - The iterable or array-like objects of interest.
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15 | *
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16 | * @returns An iterator which yields the values of the iterables
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17 | * in the order in which they are supplied.
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18 | *
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19 | * #### Example
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20 | * ```typescript
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21 | * import { chain, toArray } from '@phosphor/algorithm';
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22 | *
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23 | * let data1 = [1, 2, 3];
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24 | * let data2 = [4, 5, 6];
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25 | *
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26 | * let stream = chain(data1, data2);
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27 | *
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28 | * toArray(stream); // [1, 2, 3, 4, 5, 6]
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29 | * ```
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30 | */
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31 | function chain() {
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32 | var objects = [];
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33 | for (var _i = 0; _i < arguments.length; _i++) {
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34 | objects[_i] = arguments[_i];
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35 | }
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36 | return new ChainIterator(iter_1.iter(objects.map(iter_1.iter)));
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37 | }
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38 | exports.chain = chain;
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39 | /**
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40 | * An iterator which chains together several iterators.
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41 | */
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42 | var ChainIterator = /** @class */ (function () {
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43 | /**
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44 | * Construct a new chain iterator.
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45 | *
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46 | * @param source - The iterator of iterators of interest.
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47 | */
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48 | function ChainIterator(source) {
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49 | this._cloned = false;
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50 | this._source = source;
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51 | this._active = undefined;
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52 | }
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53 | /**
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54 | * Get an iterator over the object's values.
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55 | *
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56 | * @returns An iterator which yields the object's values.
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57 | */
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58 | ChainIterator.prototype.iter = function () {
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59 | return this;
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60 | };
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61 | /**
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62 | * Create an independent clone of the iterator.
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63 | *
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64 | * @returns A new independent clone of the iterator.
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65 | */
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66 | ChainIterator.prototype.clone = function () {
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67 | var result = new ChainIterator(this._source.clone());
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68 | result._active = this._active && this._active.clone();
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69 | result._cloned = true;
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70 | this._cloned = true;
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71 | return result;
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72 | };
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73 | /**
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74 | * Get the next value from the iterator.
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75 | *
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76 | * @returns The next value from the iterator, or `undefined`.
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77 | */
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78 | ChainIterator.prototype.next = function () {
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79 | if (this._active === undefined) {
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80 | var active = this._source.next();
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81 | if (active === undefined) {
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82 | return undefined;
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83 | }
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84 | this._active = this._cloned ? active.clone() : active;
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85 | }
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86 | var value = this._active.next();
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87 | if (value !== undefined) {
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88 | return value;
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89 | }
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90 | this._active = undefined;
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91 | return this.next();
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92 | };
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93 | return ChainIterator;
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94 | }());
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95 | exports.ChainIterator = ChainIterator;
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