ce4c83ff
 wxy
初始提交
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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
*/
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;
};
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