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: / var / canvas / node_modules / rxjs / internal / observable /
Filename : generate.js
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"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var Observable_1 = require("../Observable");
var identity_1 = require("../util/identity");
var isScheduler_1 = require("../util/isScheduler");
function generate(initialStateOrOptions, condition, iterate, resultSelectorOrObservable, scheduler) {
    var resultSelector;
    var initialState;
    if (arguments.length == 1) {
        var options = initialStateOrOptions;
        initialState = options.initialState;
        condition = options.condition;
        iterate = options.iterate;
        resultSelector = options.resultSelector || identity_1.identity;
        scheduler = options.scheduler;
    }
    else if (resultSelectorOrObservable === undefined || isScheduler_1.isScheduler(resultSelectorOrObservable)) {
        initialState = initialStateOrOptions;
        resultSelector = identity_1.identity;
        scheduler = resultSelectorOrObservable;
    }
    else {
        initialState = initialStateOrOptions;
        resultSelector = resultSelectorOrObservable;
    }
    return new Observable_1.Observable(function (subscriber) {
        var state = initialState;
        if (scheduler) {
            return scheduler.schedule(dispatch, 0, {
                subscriber: subscriber,
                iterate: iterate,
                condition: condition,
                resultSelector: resultSelector,
                state: state
            });
        }
        do {
            if (condition) {
                var conditionResult = void 0;
                try {
                    conditionResult = condition(state);
                }
                catch (err) {
                    subscriber.error(err);
                    return undefined;
                }
                if (!conditionResult) {
                    subscriber.complete();
                    break;
                }
            }
            var value = void 0;
            try {
                value = resultSelector(state);
            }
            catch (err) {
                subscriber.error(err);
                return undefined;
            }
            subscriber.next(value);
            if (subscriber.closed) {
                break;
            }
            try {
                state = iterate(state);
            }
            catch (err) {
                subscriber.error(err);
                return undefined;
            }
        } while (true);
        return undefined;
    });
}
exports.generate = generate;
function dispatch(state) {
    var subscriber = state.subscriber, condition = state.condition;
    if (subscriber.closed) {
        return undefined;
    }
    if (state.needIterate) {
        try {
            state.state = state.iterate(state.state);
        }
        catch (err) {
            subscriber.error(err);
            return undefined;
        }
    }
    else {
        state.needIterate = true;
    }
    if (condition) {
        var conditionResult = void 0;
        try {
            conditionResult = condition(state.state);
        }
        catch (err) {
            subscriber.error(err);
            return undefined;
        }
        if (!conditionResult) {
            subscriber.complete();
            return undefined;
        }
        if (subscriber.closed) {
            return undefined;
        }
    }
    var value;
    try {
        value = state.resultSelector(state.state);
    }
    catch (err) {
        subscriber.error(err);
        return undefined;
    }
    if (subscriber.closed) {
        return undefined;
    }
    subscriber.next(value);
    if (subscriber.closed) {
        return undefined;
    }
    return this.schedule(state);
}
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