planning

node_modules/remark-stringify/lib/util/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
+}