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32 lines
809 B
32 lines
809 B
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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