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- 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
- */
- 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;
- }
- range.params = ['start', 'stop', 'step'];
- module.exports = range;
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