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node_modules/to-regex-range/index.js

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-/*!
- * 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;