@codibre/fluent-iterable/dist/recipes/partition-recipe.js

Provides LINQ-like fluent api operations for iterables and async iterables (ES2018+).

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.othersFactory = othersFactory;
exports.partIterateFactory = partIterateFactory;
exports.partitionRecipe = partitionRecipe;
const get_partition_comparer_1 = require("./get-partition-comparer");
function othersFactory(resolver) {
    return (wrapper) => {
        const { iterator, comparer } = wrapper;
        return () => {
            return resolver(iterator.next(), (next) => {
                const previous = wrapper.next.value;
                wrapper.next = next;
                return wrapper.next.done || !comparer(previous, wrapper.next.value)
                    ? { done: true }
                    : wrapper.next;
            });
        };
    };
}
function partIterateFactory(symbol, getOthers) {
    return (wrapper) => {
        let call;
        const others = getOthers(wrapper);
        function first() {
            call = others;
            return wrapper.next;
        }
        call = first;
        return {
            [symbol]: () => ({
                next: () => call(),
            }),
        };
    };
}
function getValueFactory(wrapper, partIterate) {
    return () => {
        return wrapper.next.done
            ? { done: true }
            : {
                value: partIterate(wrapper),
            };
    };
}
function firstValueFactory(wrapper, callback) {
    return (v) => {
        wrapper.next = v;
        return callback();
    };
}
function nextFactory(resolver, wrapper, getValue) {
    let first = true;
    const { iterator } = wrapper;
    return () => {
        if (first) {
            first = false;
            return resolver(iterator.next(), firstValueFactory(wrapper, getValue));
        }
        return getValue();
    };
}
function partitionIterateRecipe(symbol, resolver) {
    return (arr, criteria) => {
        const iterator = arr[symbol]();
        const wrapper = {
            iterator,
            comparer: (0, get_partition_comparer_1.getPartitionComparer)(criteria),
        };
        const partIterate = partIterateFactory(symbol, othersFactory(resolver));
        const getValue = getValueFactory(wrapper, partIterate);
        return {
            [symbol]() {
                return {
                    next: nextFactory(resolver, wrapper, getValue),
                    return: iterator.return ? iterator.return.bind(iterator) : undefined,
                    throw: iterator.throw ? iterator.throw.bind(iterator) : undefined,
                };
            },
        };
    };
}
function partitionRecipe(symbol, resolver) {
    const partitioning = partitionIterateRecipe(symbol, resolver);
    return function (criteria) {
        if (typeof criteria == 'number' && criteria < 1) {
            throw new Error(`Validation failed, size (${criteria}) expected to be bigger than 0`);
        }
        return partitioning(this, criteria);
    };
}