You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
59 lines
1.5 KiB
59 lines
1.5 KiB
'use strict';
|
|
|
|
var compactField = require('./field_compactor');
|
|
|
|
function stringifyField(arr, min, max) {
|
|
var ranges = compactField(arr);
|
|
if (ranges.length === 1) {
|
|
var singleRange = ranges[0];
|
|
var step = singleRange.step;
|
|
if (step === 1 && singleRange.start === min && singleRange.end === max) {
|
|
return '*';
|
|
}
|
|
if (step !== 1 && singleRange.start === min && singleRange.end === max - step + 1) {
|
|
return '*/' + step;
|
|
}
|
|
}
|
|
|
|
var result = [];
|
|
for (var i = 0, l = ranges.length; i < l; ++i) {
|
|
var range = ranges[i];
|
|
if (range.count === 1) {
|
|
result.push(range.start);
|
|
continue;
|
|
}
|
|
|
|
var step = range.step;
|
|
if (range.step === 1) {
|
|
result.push(range.start + '-' + range.end);
|
|
continue;
|
|
}
|
|
|
|
var multiplier = range.start == 0 ? range.count - 1 : range.count;
|
|
if (range.step * multiplier > range.end) {
|
|
result = result.concat(
|
|
Array
|
|
.from({ length: range.end - range.start + 1 })
|
|
.map(function (_, index) {
|
|
var value = range.start + index;
|
|
if ((value - range.start) % range.step === 0) {
|
|
return value;
|
|
}
|
|
return null;
|
|
})
|
|
.filter(function (value) {
|
|
return value != null;
|
|
})
|
|
);
|
|
} else if (range.end === max - range.step + 1) {
|
|
result.push(range.start + '/' + range.step);
|
|
} else {
|
|
result.push(range.start + '-' + range.end + '/' + range.step);
|
|
}
|
|
}
|
|
|
|
return result.join(',');
|
|
}
|
|
|
|
module.exports = stringifyField;
|