/*!
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* fill-range <https://github.com/jonschlinkert/fill-range>
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*
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* Copyright (c) 2014-present, Jon Schlinkert.
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* Licensed under the MIT License.
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*/
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'use strict';
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const util = require('util');
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const toRegexRange = require('to-regex-range');
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const isObject = val => val !== null && typeof val === 'object' && !Array.isArray(val);
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const transform = toNumber => {
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return value => toNumber === true ? Number(value) : String(value);
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};
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const isValidValue = value => {
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return typeof value === 'number' || (typeof value === 'string' && value !== '');
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};
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const isNumber = num => Number.isInteger(+num);
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const zeros = input => {
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let value = `${input}`;
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let index = -1;
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if (value[0] === '-') value = value.slice(1);
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if (value === '0') return false;
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while (value[++index] === '0');
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return index > 0;
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};
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const stringify = (start, end, options) => {
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if (typeof start === 'string' || typeof end === 'string') {
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return true;
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}
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return options.stringify === true;
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};
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const pad = (input, maxLength, toNumber) => {
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if (maxLength > 0) {
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let dash = input[0] === '-' ? '-' : '';
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if (dash) input = input.slice(1);
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input = (dash + input.padStart(dash ? maxLength - 1 : maxLength, '0'));
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}
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if (toNumber === false) {
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return String(input);
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}
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return input;
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};
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const toMaxLen = (input, maxLength) => {
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let negative = input[0] === '-' ? '-' : '';
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if (negative) {
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input = input.slice(1);
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maxLength--;
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}
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while (input.length < maxLength) input = '0' + input;
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return negative ? ('-' + input) : input;
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};
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const toSequence = (parts, options) => {
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parts.negatives.sort((a, b) => a < b ? -1 : a > b ? 1 : 0);
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parts.positives.sort((a, b) => a < b ? -1 : a > b ? 1 : 0);
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let prefix = options.capture ? '' : '?:';
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let positives = '';
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let negatives = '';
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let result;
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if (parts.positives.length) {
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positives = parts.positives.join('|');
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}
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if (parts.negatives.length) {
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negatives = `-(${prefix}${parts.negatives.join('|')})`;
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}
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if (positives && negatives) {
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result = `${positives}|${negatives}`;
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} else {
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result = positives || negatives;
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}
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if (options.wrap) {
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return `(${prefix}${result})`;
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}
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return result;
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};
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const toRange = (a, b, isNumbers, options) => {
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if (isNumbers) {
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return toRegexRange(a, b, { wrap: false, ...options });
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}
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let start = String.fromCharCode(a);
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if (a === b) return start;
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let stop = String.fromCharCode(b);
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return `[${start}-${stop}]`;
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};
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const toRegex = (start, end, options) => {
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if (Array.isArray(start)) {
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let wrap = options.wrap === true;
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let prefix = options.capture ? '' : '?:';
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return wrap ? `(${prefix}${start.join('|')})` : start.join('|');
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}
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return toRegexRange(start, end, options);
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};
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const rangeError = (...args) => {
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return new RangeError('Invalid range arguments: ' + util.inspect(...args));
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};
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const invalidRange = (start, end, options) => {
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if (options.strictRanges === true) throw rangeError([start, end]);
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return [];
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};
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const invalidStep = (step, options) => {
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if (options.strictRanges === true) {
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throw new TypeError(`Expected step "${step}" to be a number`);
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}
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return [];
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};
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const fillNumbers = (start, end, step = 1, options = {}) => {
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let a = Number(start);
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let b = Number(end);
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if (!Number.isInteger(a) || !Number.isInteger(b)) {
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if (options.strictRanges === true) throw rangeError([start, end]);
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return [];
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}
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// fix negative zero
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if (a === 0) a = 0;
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if (b === 0) b = 0;
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let descending = a > b;
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let startString = String(start);
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let endString = String(end);
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let stepString = String(step);
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step = Math.max(Math.abs(step), 1);
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let padded = zeros(startString) || zeros(endString) || zeros(stepString);
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let maxLen = padded ? Math.max(startString.length, endString.length, stepString.length) : 0;
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let toNumber = padded === false && stringify(start, end, options) === false;
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let format = options.transform || transform(toNumber);
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if (options.toRegex && step === 1) {
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return toRange(toMaxLen(start, maxLen), toMaxLen(end, maxLen), true, options);
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}
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let parts = { negatives: [], positives: [] };
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let push = num => parts[num < 0 ? 'negatives' : 'positives'].push(Math.abs(num));
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let range = [];
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let index = 0;
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while (descending ? a >= b : a <= b) {
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if (options.toRegex === true && step > 1) {
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push(a);
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} else {
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range.push(pad(format(a, index), maxLen, toNumber));
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}
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a = descending ? a - step : a + step;
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index++;
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}
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if (options.toRegex === true) {
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return step > 1
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? toSequence(parts, options)
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: toRegex(range, null, { wrap: false, ...options });
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}
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return range;
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};
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const fillLetters = (start, end, step = 1, options = {}) => {
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if ((!isNumber(start) && start.length > 1) || (!isNumber(end) && end.length > 1)) {
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return invalidRange(start, end, options);
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}
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let format = options.transform || (val => String.fromCharCode(val));
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let a = `${start}`.charCodeAt(0);
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let b = `${end}`.charCodeAt(0);
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let descending = a > b;
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let min = Math.min(a, b);
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let max = Math.max(a, b);
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if (options.toRegex && step === 1) {
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return toRange(min, max, false, options);
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}
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let range = [];
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let index = 0;
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while (descending ? a >= b : a <= b) {
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range.push(format(a, index));
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a = descending ? a - step : a + step;
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index++;
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}
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if (options.toRegex === true) {
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return toRegex(range, null, { wrap: false, options });
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}
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return range;
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};
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const fill = (start, end, step, options = {}) => {
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if (end == null && isValidValue(start)) {
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return [start];
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}
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if (!isValidValue(start) || !isValidValue(end)) {
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return invalidRange(start, end, options);
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}
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if (typeof step === 'function') {
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return fill(start, end, 1, { transform: step });
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}
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if (isObject(step)) {
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return fill(start, end, 0, step);
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}
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let opts = { ...options };
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if (opts.capture === true) opts.wrap = true;
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step = step || opts.step || 1;
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if (!isNumber(step)) {
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if (step != null && !isObject(step)) return invalidStep(step, opts);
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return fill(start, end, 1, step);
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}
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if (isNumber(start) && isNumber(end)) {
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return fillNumbers(start, end, step, opts);
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}
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return fillLetters(start, end, Math.max(Math.abs(step), 1), opts);
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};
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module.exports = fill;
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