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TimeRange.js
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TimeRange.js
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/**
* @class TimeRange
* A JavaScript representation of a time range. Each range has a _from_, _to_, and _step_ values.
*
* Examples:
* var enumm = ['jan','feb','mar','apr',
* 'may','jun','jul','aug',
* 'sep','oct','nov','dec'];
*
* var slot = new TimeSlot('Month', 1, 12, enumm);
* var range1 = new TimeRange(slot, '* / 2'); // every other month
* var range2 = new TimeRange(slot, 'jun - sep'); // every summer
*
* @param {TimeSlot} __slot__ The owner time slot object
* @param {String} __range__ The range string e.g. _* / 2_, _jun - sep_
*/
function TimeRange(s, range) {
var self = this;
var slot = s;
var from = null;
var to = null;
var step = 1;
/**
* Renders the object to a string as it would be written to the system.
*
* Examples:
* new CronTab(function(err, tab) {
* if (err) { console.log(err); process.exit(1); }
*
* var jobs = tab.jobs({command:'ls -l /'});
* for (var i = 0; i < jobs.length; i++) {
* console.log(jobs[i].hour().between(9, 17).render());
* }
* });
*
* @return {String}
*/
this.render = function() {
var value = '*';
if (from > slot.getMin() || to < slot.getMax()) {
value = from + '-' + to;
}
if (step != 1) {
value += '/' + step;
}
return value;
}
/**
* Set the step value for this range.
*
* Examples:
* new CronTab(function(err, tab) {
* if (err) { console.log(err); process.exit(1); }
*
* var jobs = tab.jobs({command:'ls -l /'});
* for (var i = 0; i < jobs.length; i++) {
* // every other business hour
* jobs[i].hour().between(9, 17).every(2);
* }
* });
*/
this.every = function(value) {
step = parseInt(value);
}
/**
* Renders the object to a string as it would be written to the system. See __render__.
*
* Examples:
* new CronTab(function(err, tab) {
* if (err) { console.log(err); process.exit(1); }
*
* var jobs = tab.jobs({command:'ls -l /'});
* for (var i = 0; i < jobs.length; i++) {
* console.log(jobs[i].hour().between(9, 17).toString());
* }
* });
*
* @return {String}
*/
this.toString = function() {
return this.render();
}
/**
* Converts a string value representing a range limit to an integer.
*
* @param {String} __value__ e.g. _5_,_mon_,_jan_
* @return {Number}
*
* @api private
*/
function cleanValue(value) {
var sValue = String(value);
var lValue = sValue.toLowerCase();
var enummIdx = (slot.getEnum() || []).indexOf(lValue);
if (enummIdx >= 0) {
value = enummIdx;
}
var iValue = parseInt(value);
if (iValue >= slot.getMin() && iValue <= slot.getMax()) {
return iValue
}
return null;
}
/**
* Initializes a new TimeRange object.
*
* @api private
*/
function init() {
if (!range) {
range = '*';
}
if (range.indexOf('/') > 0) {
var tokens = range.split('/');
range = tokens[0];
step = tokens[1];
}
if (range.indexOf('-') > 0) {
var tokens = range.split('-');
from = cleanValue(tokens[0]);
to = cleanValue(tokens[1]);
if (from == null) {
throw new Error('Invalid range value ' + tokens[0]);
}
else if (to == null) {
throw new Error('Invalid range value ' + tokens[1]);
}
}
else if (range == '*') {
from = slot.getMin();
to = slot.getMax();
}
else {
throw new Error('Unknown time range value ' + range);
}
}
init();
}
module.exports = TimeRange;