planning

node_modules/remark-stringify/lib/util/copy-identifier-encoding.js

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+'use strict'
+
+var entityPrefixLength = require('./entity-prefix-length')
+
+module.exports = copy
+
+var ampersand = '&'
+
+var punctuationExppresion = /[-!"#$%&'()*+,./:;<=>?@[\\\]^`{|}~_]/
+
+// For shortcut and collapsed reference links, the contents is also an
+// identifier, so we need to restore the original encoding and escaping
+// that were present in the source string.
+//
+// This function takes the unescaped & unencoded value from shortcut’s
+// child nodes and the identifier and encodes the former according to
+// the latter.
+function copy(value, identifier) {
+  var length = value.length
+  var count = identifier.length
+  var result = []
+  var position = 0
+  var index = 0
+  var start
+
+  while (index < length) {
+    // Take next non-punctuation characters from `value`.
+    start = index
+
+    while (index < length && !punctuationExppresion.test(value.charAt(index))) {
+      index += 1
+    }
+
+    result.push(value.slice(start, index))
+
+    // Advance `position` to the next punctuation character.
+    while (
+      position < count &&
+      !punctuationExppresion.test(identifier.charAt(position))
+    ) {
+      position += 1
+    }
+
+    // Take next punctuation characters from `identifier`.
+    start = position
+
+    while (
+      position < count &&
+      punctuationExppresion.test(identifier.charAt(position))
+    ) {
+      if (identifier.charAt(position) === ampersand) {
+        position += entityPrefixLength(identifier.slice(position))
+      }
+
+      position += 1
+    }
+
+    result.push(identifier.slice(start, position))
+
+    // Advance `index` to the next non-punctuation character.
+    while (index < length && punctuationExppresion.test(value.charAt(index))) {
+      index += 1
+    }
+  }
+
+  return result.join('')
+}