67 lines
1.7 KiB
JavaScript
Executable File
67 lines
1.7 KiB
JavaScript
Executable File
var _ = require('underscore');
|
|
|
|
var SOURCE_ID_REGEX = /^([a-z]+)(\d*)$/; // matches a string with one or more letters + numbers, e.g. 'b2'
|
|
|
|
var newId = function (id, seqChange) {
|
|
if (!id || !id.match) throw new Error('invalid id');
|
|
|
|
var matches = id.match(SOURCE_ID_REGEX);
|
|
matches[2] = matches[2] || -1;
|
|
|
|
if (matches && matches.length === 3) {
|
|
// letter + next number
|
|
var letter = matches[1];
|
|
var seq = parseInt(matches[2], 10) + seqChange;
|
|
return letter + Math.max(seq, 0);
|
|
} else {
|
|
throw new Error('invalid id');
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Encapsulates logic related to the nodes' IDs.
|
|
*/
|
|
module.exports = {
|
|
|
|
/**
|
|
* Get next id in sequence of given source id.
|
|
* @param {String} id, e.g. 'c2'
|
|
* @return {String} e.g. 'c3'
|
|
*/
|
|
next: function (id) {
|
|
return newId(id, 1);
|
|
},
|
|
|
|
prev: function (id) {
|
|
return newId(id, -1);
|
|
},
|
|
|
|
/**
|
|
* Get the letter representation.
|
|
* @param {String, Object} sourceId or backbone model that have id. e.g. 'c2'
|
|
* @return {String} e.g. 'c' or an empty string if there is no letter in the given id
|
|
*/
|
|
letter: function (sourceId) {
|
|
if (!sourceId || !_.isString(sourceId)) return '';
|
|
var match = sourceId.match(/^([a-z]+)/);
|
|
return _.isArray(match) && match[0] || '';
|
|
},
|
|
|
|
/**
|
|
* Get the sequence representation.
|
|
* @param {String, Object} sourceId or backbone model that have id. e.g. 'c2'
|
|
* @return {Number} e.g. 2 or undefined if there is no sequence
|
|
*/
|
|
sequence: function (sourceId) {
|
|
if (!sourceId || !_.isString(sourceId)) return;
|
|
var match = sourceId.match(/(\d+$)/);
|
|
return _.isArray(match) && match[0] || undefined;
|
|
},
|
|
|
|
changeLetter: function (id, newLetter) {
|
|
var seq = id.match(/(\d+)$/)[0];
|
|
return newLetter + seq;
|
|
}
|
|
|
|
};
|