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network-visualization/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;