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22 lines
556 B
22 lines
556 B
var utils = require('../utils') |
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, nodes = require('../nodes'); |
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/** |
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* Returns substring of the given `val`. |
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* |
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* @param {String|Ident} val |
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* @param {Number} start |
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* @param {Number} [length] |
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* @return {String|Ident} |
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* @api public |
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*/ |
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module.exports = function substr(val, start, length){ |
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utils.assertString(val, 'val'); |
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utils.assertType(start, 'unit', 'start'); |
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length = length && length.val; |
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var res = val.string.substr(start.val, length); |
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return val instanceof nodes.Ident |
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? new nodes.Ident(res) |
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: new nodes.String(res); |
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};
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