24 lines
564 B
JavaScript
24 lines
564 B
JavaScript
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'use strict'
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var decode = require('parse-entities')
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module.exports = length
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var ampersand = '&'
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// Returns the length of HTML entity that is a prefix of the given string
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// (excluding the ampersand), 0 if it does not start with an entity.
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function length(value) {
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var prefix
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/* istanbul ignore if - Currently also tested for at implemention, but we
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* keep it here because that’s proper. */
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if (value.charAt(0) !== ampersand) {
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return 0
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}
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prefix = value.split(ampersand, 2).join(ampersand)
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return prefix.length - decode(prefix).length
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}
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