planning

node_modules/remark-stringify/lib/util/entity-prefix-length.js

@@ -0,0 +1,23 @@
+'use strict'
+
+var decode = require('parse-entities')
+
+module.exports = length
+
+var ampersand = '&'
+
+// Returns the length of HTML entity that is a prefix of the given string
+// (excluding the ampersand), 0 if it does not start with an entity.
+function length(value) {
+  var prefix
+
+  /* istanbul ignore if - Currently also tested for at implemention, but we
+   * keep it here because that’s proper. */
+  if (value.charAt(0) !== ampersand) {
+    return 0
+  }
+
+  prefix = value.split(ampersand, 2).join(ampersand)
+
+  return prefix.length - decode(prefix).length
+}