--- /dev/null
+/*!
+ * to-regex-range <https://github.com/jonschlinkert/to-regex-range>
+ *
+ * Copyright (c) 2015, 2017, Jon Schlinkert.
+ * Released under the MIT License.
+ */
+
+'use strict';
+
+var repeat = require('repeat-string');
+var isNumber = require('is-number');
+var cache = {};
+
+function toRegexRange(min, max, options) {
+ if (isNumber(min) === false) {
+ throw new RangeError('toRegexRange: first argument is invalid.');
+ }
+
+ if (typeof max === 'undefined' || min === max) {
+ return String(min);
+ }
+
+ if (isNumber(max) === false) {
+ throw new RangeError('toRegexRange: second argument is invalid.');
+ }
+
+ options = options || {};
+ var relax = String(options.relaxZeros);
+ var shorthand = String(options.shorthand);
+ var capture = String(options.capture);
+ var key = min + ':' + max + '=' + relax + shorthand + capture;
+ if (cache.hasOwnProperty(key)) {
+ return cache[key].result;
+ }
+
+ var a = Math.min(min, max);
+ var b = Math.max(min, max);
+
+ if (Math.abs(a - b) === 1) {
+ var result = min + '|' + max;
+ if (options.capture) {
+ return '(' + result + ')';
+ }
+ return result;
+ }
+
+ var isPadded = padding(min) || padding(max);
+ var positives = [];
+ var negatives = [];
+
+ var tok = {min: min, max: max, a: a, b: b};
+ if (isPadded) {
+ tok.isPadded = isPadded;
+ tok.maxLen = String(tok.max).length;
+ }
+
+ if (a < 0) {
+ var newMin = b < 0 ? Math.abs(b) : 1;
+ var newMax = Math.abs(a);
+ negatives = splitToPatterns(newMin, newMax, tok, options);
+ a = tok.a = 0;
+ }
+
+ if (b >= 0) {
+ positives = splitToPatterns(a, b, tok, options);
+ }
+
+ tok.negatives = negatives;
+ tok.positives = positives;
+ tok.result = siftPatterns(negatives, positives, options);
+
+ if (options.capture && (positives.length + negatives.length) > 1) {
+ tok.result = '(' + tok.result + ')';
+ }
+
+ cache[key] = tok;
+ return tok.result;
+}
+
+function siftPatterns(neg, pos, options) {
+ var onlyNegative = filterPatterns(neg, pos, '-', false, options) || [];
+ var onlyPositive = filterPatterns(pos, neg, '', false, options) || [];
+ var intersected = filterPatterns(neg, pos, '-?', true, options) || [];
+ var subpatterns = onlyNegative.concat(intersected).concat(onlyPositive);
+ return subpatterns.join('|');
+}
+
+function splitToRanges(min, max) {
+ min = Number(min);
+ max = Number(max);
+
+ var nines = 1;
+ var stops = [max];
+ var stop = +countNines(min, nines);
+
+ while (min <= stop && stop <= max) {
+ stops = push(stops, stop);
+ nines += 1;
+ stop = +countNines(min, nines);
+ }
+
+ var zeros = 1;
+ stop = countZeros(max + 1, zeros) - 1;
+
+ while (min < stop && stop <= max) {
+ stops = push(stops, stop);
+ zeros += 1;
+ stop = countZeros(max + 1, zeros) - 1;
+ }
+
+ stops.sort(compare);
+ return stops;
+}
+
+/**
+ * Convert a range to a regex pattern
+ * @param {Number} `start`
+ * @param {Number} `stop`
+ * @return {String}
+ */
+
+function rangeToPattern(start, stop, options) {
+ if (start === stop) {
+ return {pattern: String(start), digits: []};
+ }
+
+ var zipped = zip(String(start), String(stop));
+ var len = zipped.length, i = -1;
+
+ var pattern = '';
+ var digits = 0;
+
+ while (++i < len) {
+ var numbers = zipped[i];
+ var startDigit = numbers[0];
+ var stopDigit = numbers[1];
+
+ if (startDigit === stopDigit) {
+ pattern += startDigit;
+
+ } else if (startDigit !== '0' || stopDigit !== '9') {
+ pattern += toCharacterClass(startDigit, stopDigit);
+
+ } else {
+ digits += 1;
+ }
+ }
+
+ if (digits) {
+ pattern += options.shorthand ? '\\d' : '[0-9]';
+ }
+
+ return { pattern: pattern, digits: [digits] };
+}
+
+function splitToPatterns(min, max, tok, options) {
+ var ranges = splitToRanges(min, max);
+ var len = ranges.length;
+ var idx = -1;
+
+ var tokens = [];
+ var start = min;
+ var prev;
+
+ while (++idx < len) {
+ var range = ranges[idx];
+ var obj = rangeToPattern(start, range, options);
+ var zeros = '';
+
+ if (!tok.isPadded && prev && prev.pattern === obj.pattern) {
+ if (prev.digits.length > 1) {
+ prev.digits.pop();
+ }
+ prev.digits.push(obj.digits[0]);
+ prev.string = prev.pattern + toQuantifier(prev.digits);
+ start = range + 1;
+ continue;
+ }
+
+ if (tok.isPadded) {
+ zeros = padZeros(range, tok);
+ }
+
+ obj.string = zeros + obj.pattern + toQuantifier(obj.digits);
+ tokens.push(obj);
+ start = range + 1;
+ prev = obj;
+ }
+
+ return tokens;
+}
+
+function filterPatterns(arr, comparison, prefix, intersection, options) {
+ var res = [];
+
+ for (var i = 0; i < arr.length; i++) {
+ var tok = arr[i];
+ var ele = tok.string;
+
+ if (options.relaxZeros !== false) {
+ if (prefix === '-' && ele.charAt(0) === '0') {
+ if (ele.charAt(1) === '{') {
+ ele = '0*' + ele.replace(/^0\{\d+\}/, '');
+ } else {
+ ele = '0*' + ele.slice(1);
+ }
+ }
+ }
+
+ if (!intersection && !contains(comparison, 'string', ele)) {
+ res.push(prefix + ele);
+ }
+
+ if (intersection && contains(comparison, 'string', ele)) {
+ res.push(prefix + ele);
+ }
+ }
+ return res;
+}
+
+/**
+ * Zip strings (`for in` can be used on string characters)
+ */
+
+function zip(a, b) {
+ var arr = [];
+ for (var ch in a) arr.push([a[ch], b[ch]]);
+ return arr;
+}
+
+function compare(a, b) {
+ return a > b ? 1 : b > a ? -1 : 0;
+}
+
+function push(arr, ele) {
+ if (arr.indexOf(ele) === -1) arr.push(ele);
+ return arr;
+}
+
+function contains(arr, key, val) {
+ for (var i = 0; i < arr.length; i++) {
+ if (arr[i][key] === val) {
+ return true;
+ }
+ }
+ return false;
+}
+
+function countNines(min, len) {
+ return String(min).slice(0, -len) + repeat('9', len);
+}
+
+function countZeros(integer, zeros) {
+ return integer - (integer % Math.pow(10, zeros));
+}
+
+function toQuantifier(digits) {
+ var start = digits[0];
+ var stop = digits[1] ? (',' + digits[1]) : '';
+ if (!stop && (!start || start === 1)) {
+ return '';
+ }
+ return '{' + start + stop + '}';
+}
+
+function toCharacterClass(a, b) {
+ return '[' + a + ((b - a === 1) ? '' : '-') + b + ']';
+}
+
+function padding(str) {
+ return /^-?(0+)\d/.exec(str);
+}
+
+function padZeros(val, tok) {
+ if (tok.isPadded) {
+ var diff = Math.abs(tok.maxLen - String(val).length);
+ switch (diff) {
+ case 0:
+ return '';
+ case 1:
+ return '0';
+ default: {
+ return '0{' + diff + '}';
+ }
+ }
+ }
+ return val;
+}
+
+/**
+ * Expose `toRegexRange`
+ */
+
+module.exports = toRegexRange;
projects / dotfiles / .git / blobdiff