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8 | 'use strict';
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9 |
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10 | const isNumber = require('is-number');
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11 |
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12 | function toRegexRange(min, max, options) {
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13 | if (isNumber(min) === false) {
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14 | throw new TypeError('toRegexRange: expected the first argument to be a number');
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15 | }
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16 |
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17 | if (typeof max === 'undefined' || min === max) {
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18 | return String(min);
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19 | }
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20 |
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21 | if (isNumber(max) === false) {
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22 | throw new TypeError('toRegexRange: expected the second argument to be a number.');
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23 | }
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24 |
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25 | options = options || {};
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26 | let relax = String(options.relaxZeros);
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27 | let shorthand = String(options.shorthand);
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28 | let capture = String(options.capture);
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29 | let key = min + ':' + max + '=' + relax + shorthand + capture;
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30 | if (toRegexRange.cache.hasOwnProperty(key)) {
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31 | return toRegexRange.cache[key].result;
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32 | }
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33 |
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34 | let a = Math.min(min, max);
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35 | let b = Math.max(min, max);
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36 |
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37 | if (Math.abs(a - b) === 1) {
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38 | let result = min + '|' + max;
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39 | if (options.capture) {
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40 | return '(' + result + ')';
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41 | }
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42 | return result;
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43 | }
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44 |
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45 | let isPadded = padding(min) || padding(max);
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46 | let positives = [];
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47 | let negatives = [];
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48 |
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49 | let tok = {min: min, max: max, a: a, b: b};
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50 | if (isPadded) {
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51 | tok.isPadded = isPadded;
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52 | tok.maxLen = String(tok.max).length;
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53 | }
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54 |
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55 | if (a < 0) {
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56 | let newMin = b < 0 ? Math.abs(b) : 1;
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57 | let newMax = Math.abs(a);
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58 | negatives = splitToPatterns(newMin, newMax, tok, options);
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59 | a = tok.a = 0;
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60 | }
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61 |
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62 | if (b >= 0) {
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63 | positives = splitToPatterns(a, b, tok, options);
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64 | }
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65 |
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66 | tok.negatives = negatives;
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67 | tok.positives = positives;
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68 | tok.result = siftPatterns(negatives, positives, options);
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69 |
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70 | if (options.capture && (positives.length + negatives.length) > 1) {
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71 | tok.result = '(' + tok.result + ')';
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72 | }
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73 |
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74 | toRegexRange.cache[key] = tok;
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75 | return tok.result;
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76 | }
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77 |
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78 | toRegexRange.cache = {};
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79 |
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80 | function siftPatterns(neg, pos, options) {
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81 | let onlyNegative = filterPatterns(neg, pos, '-', false, options) || [];
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82 | let onlyPositive = filterPatterns(pos, neg, '', false, options) || [];
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83 | let intersected = filterPatterns(neg, pos, '-?', true, options) || [];
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84 | let subpatterns = onlyNegative.concat(intersected).concat(onlyPositive);
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85 | return subpatterns.join('|');
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86 | }
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87 |
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88 | function splitToRanges(min, max) {
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89 | min = Number(min);
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90 | max = Number(max);
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91 |
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92 | let nines = 1;
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93 | let stops = [max];
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94 | let stop = +countNines(min, nines);
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95 |
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96 | while (min <= stop && stop <= max) {
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97 | stops = push(stops, stop);
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98 | nines += 1;
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99 | stop = +countNines(min, nines);
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100 | }
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101 |
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102 | let zeros = 1;
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103 | stop = countZeros(max + 1, zeros) - 1;
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104 |
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105 | while (min < stop && stop <= max) {
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106 | stops = push(stops, stop);
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107 | zeros += 1;
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108 | stop = countZeros(max + 1, zeros) - 1;
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109 | }
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110 |
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111 | stops.sort(compare);
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112 | return stops;
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113 | }
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114 |
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115 |
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116 |
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117 |
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118 |
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119 |
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120 |
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121 |
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122 | function rangeToPattern(start, stop, options) {
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123 | if (start === stop) {
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124 | return {pattern: String(start), digits: []};
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125 | }
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126 |
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127 | let zipped = zip(String(start), String(stop));
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128 | let len = zipped.length, i = -1;
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129 |
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130 | let pattern = '';
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131 | let digits = 0;
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132 |
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133 | while (++i < len) {
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134 | let numbers = zipped[i];
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135 | let startDigit = numbers[0];
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136 | let stopDigit = numbers[1];
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137 |
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138 | if (startDigit === stopDigit) {
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139 | pattern += startDigit;
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140 |
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141 | } else if (startDigit !== '0' || stopDigit !== '9') {
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142 | pattern += toCharacterClass(startDigit, stopDigit);
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143 |
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144 | } else {
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145 | digits += 1;
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146 | }
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147 | }
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148 |
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149 | if (digits) {
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150 | pattern += options.shorthand ? '\\d' : '[0-9]';
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151 | }
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152 |
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153 | return { pattern: pattern, digits: [digits] };
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154 | }
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155 |
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156 | function splitToPatterns(min, max, tok, options) {
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157 | let ranges = splitToRanges(min, max);
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158 | let len = ranges.length;
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159 | let idx = -1;
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160 |
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161 | let tokens = [];
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162 | let start = min;
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163 | let prev;
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164 |
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165 | while (++idx < len) {
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166 | let range = ranges[idx];
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167 | let obj = rangeToPattern(start, range, options);
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168 | let zeros = '';
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169 |
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170 | if (!tok.isPadded && prev && prev.pattern === obj.pattern) {
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171 | if (prev.digits.length > 1) {
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172 | prev.digits.pop();
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173 | }
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174 | prev.digits.push(obj.digits[0]);
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175 | prev.string = prev.pattern + toQuantifier(prev.digits);
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176 | start = range + 1;
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177 | continue;
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178 | }
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179 |
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180 | if (tok.isPadded) {
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181 | zeros = padZeros(range, tok);
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182 | }
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183 |
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184 | obj.string = zeros + obj.pattern + toQuantifier(obj.digits);
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185 | tokens.push(obj);
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186 | start = range + 1;
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187 | prev = obj;
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188 | }
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189 |
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190 | return tokens;
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191 | }
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192 |
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193 | function filterPatterns(arr, comparison, prefix, intersection, options) {
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194 | let res = [];
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195 |
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196 | for (let i = 0; i < arr.length; i++) {
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197 | let tok = arr[i];
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198 | let ele = tok.string;
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199 |
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200 | if (options.relaxZeros !== false) {
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201 | if (prefix === '-' && ele.charAt(0) === '0') {
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202 | if (ele.charAt(1) === '{') {
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203 | ele = '0*' + ele.replace(/^0\{\d+\}/, '');
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204 | } else {
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205 | ele = '0*' + ele.slice(1);
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206 | }
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207 | }
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208 | }
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209 |
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210 | if (!intersection && !contains(comparison, 'string', ele)) {
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211 | res.push(prefix + ele);
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212 | }
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213 |
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214 | if (intersection && contains(comparison, 'string', ele)) {
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215 | res.push(prefix + ele);
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216 | }
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217 | }
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218 | return res;
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219 | }
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220 |
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221 |
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222 |
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223 |
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224 |
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225 | function zip(a, b) {
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226 | let arr = [];
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227 | for (let ch in a) arr.push([a[ch], b[ch]]);
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228 | return arr;
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229 | }
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230 |
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231 | function compare(a, b) {
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232 | return a > b ? 1 : b > a ? -1 : 0;
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233 | }
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234 |
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235 | function push(arr, ele) {
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236 | if (arr.indexOf(ele) === -1) arr.push(ele);
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237 | return arr;
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238 | }
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239 |
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240 | function contains(arr, key, val) {
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241 | for (let i = 0; i < arr.length; i++) {
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242 | if (arr[i][key] === val) {
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243 | return true;
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244 | }
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245 | }
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246 | return false;
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247 | }
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248 |
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249 | function countNines(min, len) {
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250 | return String(min).slice(0, -len) + '9'.repeat(len);
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251 | }
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252 |
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253 | function countZeros(integer, zeros) {
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254 | return integer - (integer % Math.pow(10, zeros));
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255 | }
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256 |
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257 | function toQuantifier(digits) {
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258 | let start = digits[0];
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259 | let stop = digits[1] ? (',' + digits[1]) : '';
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260 | if (!stop && (!start || start === 1)) {
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261 | return '';
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262 | }
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263 | return '{' + start + stop + '}';
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264 | }
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265 |
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266 | function toCharacterClass(a, b) {
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267 | return '[' + a + ((b - a === 1) ? '' : '-') + b + ']';
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268 | }
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269 |
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270 | function padding(str) {
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271 | return /^-?(0+)\d/.exec(str);
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272 | }
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273 |
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274 | function padZeros(val, tok) {
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275 | if (tok.isPadded) {
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276 | let diff = Math.abs(tok.maxLen - String(val).length);
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277 | switch (diff) {
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278 | case 0:
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279 | return '';
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280 | case 1:
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281 | return '0';
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282 | default: {
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283 | return '0{' + diff + '}';
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284 | }
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285 | }
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286 | }
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287 | return val;
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288 | }
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289 |
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290 |
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291 |
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292 |
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293 |
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294 | toRegexRange.clearCache = () => (toRegexRange.cache = {});
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295 | module.exports = toRegexRange;
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