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Filename : enclose-uri.js

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'use strict'

var count = require('ccount')

module.exports = enclose

var leftParenthesis = '('
var rightParenthesis = ')'
var lessThan = '<'
var greaterThan = '>'

var expression = /\s/

// Wrap `url` in angle brackets when needed, or when
// forced.
// In links, images, and definitions, the URL part needs
// to be enclosed when it:
//
// - has a length of `0`
// - contains white-space
// - has more or less opening than closing parentheses
function enclose(uri, always) {
  if (
    always ||
    uri.length === 0 ||
    expression.test(uri) ||
    count(uri, leftParenthesis) !== count(uri, rightParenthesis)
  ) {
    return lessThan + uri + greaterThan
  }

  return uri
}