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node_modules/hast-util-to-html/lib/handle/comment.js

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+/**
+ * @import {Comment, Parents} from 'hast'
+ * @import {State} from '../index.js'
+ */
+
+import {stringifyEntities} from 'stringify-entities'
+
+const htmlCommentRegex = /^>|^->|<!--|-->|--!>|<!-$/g
+
+// Declare arrays as variables so it can be cached by `stringifyEntities`
+const bogusCommentEntitySubset = ['>']
+const commentEntitySubset = ['<', '>']
+
+/**
+ * Serialize a comment.
+ *
+ * @param {Comment} node
+ *   Node to handle.
+ * @param {number | undefined} _1
+ *   Index of `node` in `parent.
+ * @param {Parents | undefined} _2
+ *   Parent of `node`.
+ * @param {State} state
+ *   Info passed around about the current state.
+ * @returns {string}
+ *   Serialized node.
+ */
+export function comment(node, _1, _2, state) {
+  // See: <https://html.spec.whatwg.org/multipage/syntax.html#comments>
+  return state.settings.bogusComments
+    ? '<?' +
+        stringifyEntities(
+          node.value,
+          Object.assign({}, state.settings.characterReferences, {
+            subset: bogusCommentEntitySubset
+          })
+        ) +
+        '>'
+    : '<!--' + node.value.replace(htmlCommentRegex, encode) + '-->'
+
+  /**
+   * @param {string} $0
+   */
+  function encode($0) {
+    return stringifyEntities(
+      $0,
+      Object.assign({}, state.settings.characterReferences, {
+        subset: commentEntitySubset
+      })
+    )
+  }
+}