/usr/lib/nodejs/to-regex-range/index.js is in node-to-regex-range 0.2.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* to-regex-range <https://github.com/jonschlinkert/to-regex-range>
*
* Copyright (c) 2015, Jon Schlinkert.
* Licensed under the MIT License.
*/
'use strict';
var repeat = require('repeat-string');
var isNumber = require('is-number');
var cache = {range: {}, rangeToPattern: {}};
function toRegexRange(min, max) {
if (isNumber(min) === false) {
throw new RangeError('toRegexRange: first argument is invalid.');
}
if (typeof max === 'undefined') {
return '' + min;
}
if (isNumber(max) === false) {
throw new RangeError('toRegexRange: second argument is invalid.');
}
var key = min + ':' + max;
if (cache.range.hasOwnProperty(key)) {
return cache.range[key];
}
var a = min;
var b = max;
if (min > 0 && max > 0) {
a = Math.min(min, max);
b = Math.max(min, max);
}
if (a === b) {
return a;
}
if (a > b) {
return a + '|' + b;
}
a = String(a);
b = String(b);
var positives = [];
var negatives = [];
if (a < 0) {
var newMin = 1;
if (b < 0) {
newMin = Math.abs(b);
}
var newMax = Math.abs(a);
negatives = splitToPatterns(newMin, newMax);
a = 0;
}
if (b >= 0) {
positives = splitToPatterns(a, b);
}
var res = siftPatterns(negatives, positives);
cache.range[key] = res;
return res;
}
function siftPatterns(negatives, positives) {
var onlyNegative = filterPatterns(negatives, positives, '-');
var onlyPositive = filterPatterns(positives, negatives, '');
var intersected = filterPatterns(negatives, positives, '-?', true);
var subpatterns = onlyNegative.concat(intersected || []).concat(onlyPositive || []);
return subpatterns.join('|');
}
function splitToRanges(min, max) {
min = +min;
max = +max;
var nines = 1;
var stops = [max];
var stop = +countNines(min, nines);
while (min <= stop && stop <= max) {
stops = add(stops, stop);
nines += 1;
stop = +countNines(min, nines);
}
var zeros = 1;
stop = countZeros(max + 1, zeros) - 1;
while (min < stop && stop <= max) {
stops = add(stops, stop);
zeros += 1;
stop = countZeros(max + 1, zeros) - 1;
}
stops.sort(compare);
return stops;
}
function rangeToPattern(start, stop) {
var key = start + ':' + stop;
if (cache.rangeToPattern.hasOwnProperty(key)) {
return cache.rangeToPattern[key];
}
var zipped = zip(String(start), String(stop));
var len = zipped.length, i = -1;
var pattern = '';
var digits = 0;
while (++i < len) {
var current = zipped[i];
var startDigit = current[0];
var stopDigit = current[1];
if (startDigit === stopDigit) {
pattern += startDigit;
} else if (startDigit !== '0' || stopDigit !== '9') {
pattern += toCharacterClass(startDigit, stopDigit);
} else {
digits += 1;
}
}
if (digits) {
pattern += '[0-9]';
}
if (digits > 1) {
pattern += limit(digits);
}
cache.rangeToPattern[key] = pattern;
return pattern;
}
/**
* 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 splitToPatterns(min, max) {
var ranges = splitToRanges(min, max);
var len = ranges.length;
var idx = -1;
var start = min;
var subpatterns = new Array(len);
while (++idx < len) {
var range = ranges[idx];
subpatterns[idx] = rangeToPattern(start, range);
start = range + 1;
}
return subpatterns;
}
function filterPatterns(arr, comparison, prefix, intersection) {
var len = arr.length, i = -1;
var intersected = [];
var res = [];
while (++i < len) {
var ele = arr[i];
if (!intersection && comparison.indexOf(ele) === -1) {
res.push(prefix + ele);
}
if (intersection && comparison.indexOf(ele) !== -1) {
intersected.push(prefix + ele);
}
}
return intersection ? intersected : res;
}
function countNines(num, len) {
return String(num).slice(0, -len) + repeat('9', len);
}
function countZeros(integer, zeros) {
return integer - (integer % Math.pow(10, zeros));
}
function limit(str) {
return '{' + str + '}';
}
function toCharacterClass(a, b) {
return '[' + a + '-' + b + ']';
}
function compare(a, b) {
return a - b;
}
function add(arr, ele) {
if (arr.indexOf(ele) === -1) {
arr.push(ele);
}
return arr;
}
/**
* Expose `toRegexRange`
*/
module.exports = toRegexRange;
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