/*!
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* to-regex-range <https://github.com/micromatch/to-regex-range>
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*
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* Copyright (c) 2015-present, Jon Schlinkert.
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* Released under the MIT License.
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*/
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'use strict';
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const isNumber = require('is-number');
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const toRegexRange = (min, max, options) => {
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if (isNumber(min) === false) {
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throw new TypeError('toRegexRange: expected the first argument to be a number');
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}
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if (max === void 0 || min === max) {
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return String(min);
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}
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if (isNumber(max) === false) {
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throw new TypeError('toRegexRange: expected the second argument to be a number.');
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}
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let opts = { relaxZeros: true, ...options };
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if (typeof opts.strictZeros === 'boolean') {
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opts.relaxZeros = opts.strictZeros === false;
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}
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let relax = String(opts.relaxZeros);
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let shorthand = String(opts.shorthand);
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let capture = String(opts.capture);
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let wrap = String(opts.wrap);
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let cacheKey = min + ':' + max + '=' + relax + shorthand + capture + wrap;
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if (toRegexRange.cache.hasOwnProperty(cacheKey)) {
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return toRegexRange.cache[cacheKey].result;
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}
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let a = Math.min(min, max);
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let b = Math.max(min, max);
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if (Math.abs(a - b) === 1) {
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let result = min + '|' + max;
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if (opts.capture) {
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return `(${result})`;
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}
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if (opts.wrap === false) {
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return result;
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}
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return `(?:${result})`;
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}
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let isPadded = hasPadding(min) || hasPadding(max);
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let state = { min, max, a, b };
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let positives = [];
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let negatives = [];
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if (isPadded) {
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state.isPadded = isPadded;
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state.maxLen = String(state.max).length;
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}
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if (a < 0) {
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let newMin = b < 0 ? Math.abs(b) : 1;
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negatives = splitToPatterns(newMin, Math.abs(a), state, opts);
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a = state.a = 0;
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}
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if (b >= 0) {
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positives = splitToPatterns(a, b, state, opts);
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}
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state.negatives = negatives;
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state.positives = positives;
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state.result = collatePatterns(negatives, positives, opts);
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if (opts.capture === true) {
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state.result = `(${state.result})`;
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} else if (opts.wrap !== false && (positives.length + negatives.length) > 1) {
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state.result = `(?:${state.result})`;
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}
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toRegexRange.cache[cacheKey] = state;
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return state.result;
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};
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function collatePatterns(neg, pos, options) {
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let onlyNegative = filterPatterns(neg, pos, '-', false, options) || [];
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let onlyPositive = filterPatterns(pos, neg, '', false, options) || [];
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let intersected = filterPatterns(neg, pos, '-?', true, options) || [];
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let subpatterns = onlyNegative.concat(intersected).concat(onlyPositive);
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return subpatterns.join('|');
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}
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function splitToRanges(min, max) {
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let nines = 1;
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let zeros = 1;
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let stop = countNines(min, nines);
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let stops = new Set([max]);
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while (min <= stop && stop <= max) {
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stops.add(stop);
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nines += 1;
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stop = countNines(min, nines);
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}
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stop = countZeros(max + 1, zeros) - 1;
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while (min < stop && stop <= max) {
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stops.add(stop);
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zeros += 1;
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stop = countZeros(max + 1, zeros) - 1;
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}
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stops = [...stops];
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stops.sort(compare);
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return stops;
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}
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/**
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* Convert a range to a regex pattern
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* @param {Number} `start`
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* @param {Number} `stop`
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* @return {String}
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*/
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function rangeToPattern(start, stop, options) {
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if (start === stop) {
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return { pattern: start, count: [], digits: 0 };
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}
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let zipped = zip(start, stop);
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let digits = zipped.length;
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let pattern = '';
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let count = 0;
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for (let i = 0; i < digits; i++) {
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let [startDigit, stopDigit] = zipped[i];
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if (startDigit === stopDigit) {
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pattern += startDigit;
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} else if (startDigit !== '0' || stopDigit !== '9') {
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pattern += toCharacterClass(startDigit, stopDigit, options);
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} else {
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count++;
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}
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}
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if (count) {
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pattern += options.shorthand === true ? '\\d' : '[0-9]';
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}
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return { pattern, count: [count], digits };
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}
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function splitToPatterns(min, max, tok, options) {
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let ranges = splitToRanges(min, max);
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let tokens = [];
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let start = min;
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let prev;
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for (let i = 0; i < ranges.length; i++) {
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let max = ranges[i];
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let obj = rangeToPattern(String(start), String(max), options);
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let zeros = '';
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if (!tok.isPadded && prev && prev.pattern === obj.pattern) {
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if (prev.count.length > 1) {
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prev.count.pop();
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}
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prev.count.push(obj.count[0]);
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prev.string = prev.pattern + toQuantifier(prev.count);
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start = max + 1;
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continue;
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}
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if (tok.isPadded) {
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zeros = padZeros(max, tok, options);
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}
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obj.string = zeros + obj.pattern + toQuantifier(obj.count);
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tokens.push(obj);
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start = max + 1;
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prev = obj;
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}
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return tokens;
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}
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function filterPatterns(arr, comparison, prefix, intersection, options) {
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let result = [];
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for (let ele of arr) {
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let { string } = ele;
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// only push if _both_ are negative...
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if (!intersection && !contains(comparison, 'string', string)) {
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result.push(prefix + string);
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}
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// or _both_ are positive
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if (intersection && contains(comparison, 'string', string)) {
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result.push(prefix + string);
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}
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}
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return result;
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}
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/**
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* Zip strings
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*/
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function zip(a, b) {
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let arr = [];
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for (let i = 0; i < a.length; i++) arr.push([a[i], b[i]]);
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return arr;
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}
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function compare(a, b) {
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return a > b ? 1 : b > a ? -1 : 0;
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}
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function contains(arr, key, val) {
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return arr.some(ele => ele[key] === val);
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}
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function countNines(min, len) {
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return Number(String(min).slice(0, -len) + '9'.repeat(len));
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}
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function countZeros(integer, zeros) {
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return integer - (integer % Math.pow(10, zeros));
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}
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function toQuantifier(digits) {
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let [start = 0, stop = ''] = digits;
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if (stop || start > 1) {
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return `{${start + (stop ? ',' + stop : '')}}`;
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}
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return '';
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}
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function toCharacterClass(a, b, options) {
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return `[${a}${(b - a === 1) ? '' : '-'}${b}]`;
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}
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function hasPadding(str) {
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return /^-?(0+)\d/.test(str);
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}
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function padZeros(value, tok, options) {
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if (!tok.isPadded) {
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return value;
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}
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let diff = Math.abs(tok.maxLen - String(value).length);
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let relax = options.relaxZeros !== false;
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switch (diff) {
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case 0:
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return '';
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case 1:
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return relax ? '0?' : '0';
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case 2:
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return relax ? '0{0,2}' : '00';
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default: {
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return relax ? `0{0,${diff}}` : `0{${diff}}`;
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}
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}
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}
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/**
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* Cache
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*/
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toRegexRange.cache = {};
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toRegexRange.clearCache = () => (toRegexRange.cache = {});
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/**
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* Expose `toRegexRange`
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*/
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module.exports = toRegexRange;
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