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