77 lines
3.7 KiB
JavaScript
77 lines
3.7 KiB
JavaScript
import { Array, safeMap, safeSlice } from '../utils/globals.js';
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import { tuple } from './tuple.js';
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import { uniqueArray } from './uniqueArray.js';
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import { restrictedIntegerArbitraryBuilder } from './_internals/builders/RestrictedIntegerArbitraryBuilder.js';
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import { maxGeneratedLengthFromSizeForArbitrary, MaxLengthUpperBound, } from './_internals/helpers/MaxLengthFromMinLength.js';
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const safeMathMin = Math.min;
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const safeMathMax = Math.max;
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const safeArrayIsArray = Array.isArray;
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const safeObjectEntries = Object.entries;
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function extractMaxIndex(indexesAndValues) {
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let maxIndex = -1;
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for (let index = 0; index !== indexesAndValues.length; ++index) {
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maxIndex = safeMathMax(maxIndex, indexesAndValues[index][0]);
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}
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return maxIndex;
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}
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function arrayFromItems(length, indexesAndValues) {
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const array = Array(length);
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for (let index = 0; index !== indexesAndValues.length; ++index) {
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const it = indexesAndValues[index];
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if (it[0] < length)
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array[it[0]] = it[1];
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}
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return array;
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}
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export function sparseArray(arb, constraints = {}) {
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const { size, minNumElements = 0, maxLength = MaxLengthUpperBound, maxNumElements = maxLength, noTrailingHole, depthIdentifier, } = constraints;
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const maxGeneratedNumElements = maxGeneratedLengthFromSizeForArbitrary(size, minNumElements, maxNumElements, constraints.maxNumElements !== undefined);
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const maxGeneratedLength = maxGeneratedLengthFromSizeForArbitrary(size, maxGeneratedNumElements, maxLength, constraints.maxLength !== undefined);
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if (minNumElements > maxLength) {
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throw new Error(`The minimal number of non-hole elements cannot be higher than the maximal length of the array`);
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}
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if (minNumElements > maxNumElements) {
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throw new Error(`The minimal number of non-hole elements cannot be higher than the maximal number of non-holes`);
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}
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const resultedMaxNumElements = safeMathMin(maxNumElements, maxLength);
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const resultedSizeMaxNumElements = constraints.maxNumElements !== undefined || size !== undefined ? size : '=';
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const maxGeneratedIndexAuthorized = safeMathMax(maxGeneratedLength - 1, 0);
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const maxIndexAuthorized = safeMathMax(maxLength - 1, 0);
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const sparseArrayNoTrailingHole = uniqueArray(tuple(restrictedIntegerArbitraryBuilder(0, maxGeneratedIndexAuthorized, maxIndexAuthorized), arb), {
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size: resultedSizeMaxNumElements,
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minLength: minNumElements,
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maxLength: resultedMaxNumElements,
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selector: (item) => item[0],
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depthIdentifier,
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}).map((items) => {
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const lastIndex = extractMaxIndex(items);
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return arrayFromItems(lastIndex + 1, items);
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}, (value) => {
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if (!safeArrayIsArray(value)) {
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throw new Error('Not supported entry type');
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}
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if (noTrailingHole && value.length !== 0 && !(value.length - 1 in value)) {
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throw new Error('No trailing hole');
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}
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return safeMap(safeObjectEntries(value), (entry) => [Number(entry[0]), entry[1]]);
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});
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if (noTrailingHole || maxLength === minNumElements) {
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return sparseArrayNoTrailingHole;
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}
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return tuple(sparseArrayNoTrailingHole, restrictedIntegerArbitraryBuilder(minNumElements, maxGeneratedLength, maxLength)).map((data) => {
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const sparse = data[0];
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const targetLength = data[1];
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if (sparse.length >= targetLength) {
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return sparse;
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}
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const longerSparse = safeSlice(sparse);
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longerSparse.length = targetLength;
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return longerSparse;
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}, (value) => {
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if (!safeArrayIsArray(value)) {
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throw new Error('Not supported entry type');
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}
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return [value, value.length];
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});
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}
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