34 lines
682 B
JavaScript
34 lines
682 B
JavaScript
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'use strict'
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var count = require('ccount')
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module.exports = enclose
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var leftParenthesis = '('
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var rightParenthesis = ')'
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var lessThan = '<'
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var greaterThan = '>'
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var expression = /\s/
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// Wrap `url` in angle brackets when needed, or when
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// forced.
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// In links, images, and definitions, the URL part needs
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// to be enclosed when it:
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//
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// - has a length of `0`
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// - contains white-space
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// - has more or less opening than closing parentheses
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function enclose(uri, always) {
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if (
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always ||
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uri.length === 0 ||
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expression.test(uri) ||
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count(uri, leftParenthesis) !== count(uri, rightParenthesis)
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) {
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return lessThan + uri + greaterThan
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}
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return uri
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}
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