+class DocIterator;
+class FuncRequest;
+class Text;
+
+/** Encode the parameters needed to find \c search as a string
+ * that can be dispatched to the LyX core in a FuncRequest wrapper.
+ */
+docstring const find2string(docstring const & search,
+ bool casesensitive,
+ bool matchword,
+ bool forward);
+
+/** Encode the parameters needed to replace \c search with \c replace
+ * as a string that can be dispatched to the LyX core in a FuncRequest
+ * wrapper.
+ */
+docstring const replace2string(docstring const & replace,
+ docstring const & search,
+ bool casesensitive,
+ bool matchword,
+ bool all,
+ bool forward,
+ bool findnext = true);
+
+/** Parse the string encoding of the find request that is found in
+ * \c ev.argument and act on it.
+ * The string is encoded by \c find2string.
+ * \return true if the string was found.
+ */
+bool lyxfind(BufferView * bv, FuncRequest const & ev);
+
+/** Parse the string encoding of the replace request that is found in
+ * \c ev.argument and act on it.
+ * The string is encoded by \c replace2string.
+ * \return whether we did anything
+ */
+bool lyxreplace(BufferView * bv,
+ FuncRequest const &, bool has_deleted = false);
+
+/// find the next change in the buffer
+bool findNextChange(BufferView * bv);
+
+/// find the previous change in the buffer
+bool findPreviousChange(BufferView * bv);
+
+/// select change under the cursor
+bool selectChange(Cursor & cur, bool forward = true);
+