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.
33 lines
809 B
33 lines
809 B
9 years ago
|
var utils = require('../utils')
|
||
|
|
, nodes = require('../nodes');
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns a list of units from `start` to `stop`
|
||
|
|
* by `step`. If `step` argument is omitted,
|
||
|
|
* it defaults to 1.
|
||
|
|
*
|
||
|
|
* @param {Unit} start
|
||
|
|
* @param {Unit} stop
|
||
|
|
* @param {Unit} [step]
|
||
|
|
* @return {Expression}
|
||
|
|
* @api public
|
||
|
|
*/
|
||
|
|
|
||
|
|
module.exports = function range(start, stop, step){
|
||
|
|
utils.assertType(start, 'unit', 'start');
|
||
|
|
utils.assertType(stop, 'unit', 'stop');
|
||
|
|
if (step) {
|
||
|
|
utils.assertType(step, 'unit', 'step');
|
||
|
|
if (0 == step.val) {
|
||
|
|
throw new Error('ArgumentError: "step" argument must not be zero');
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
step = new nodes.Unit(1);
|
||
|
|
}
|
||
|
|
var list = new nodes.Expression;
|
||
|
|
for (var i = start.val; i <= stop.val; i += step.val) {
|
||
|
|
list.push(new nodes.Unit(i, start.type));
|
||
|
|
}
|
||
|
|
return list;
|
||
|
|
};
|