HackStudio: Integate with C++ parser-based autocomplete

By default, C++ auto completion will still be performed by the
lexer-based logic.
However, the parser-based logic can be switched on via the menubar.

1 files changed, 51 insertions, 0 deletions

diff --git a/Userland/DevTools/HackStudio/LanguageServers/Cpp/LexerAutoComplete.h b/Userland/DevTools/HackStudio/LanguageServers/Cpp/LexerAutoComplete.h
new file mode 100644
index 0000000000..e482818cfc
--- /dev/null
+++ b/Userland/DevTools/HackStudio/LanguageServers/Cpp/LexerAutoComplete.h
@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <AK/String.h>
+#include <AK/Vector.h>
+#include <DevTools/HackStudio/AutoCompleteResponse.h>
+#include <LibCpp/Lexer.h>
+#include <LibGUI/TextPosition.h>
+
+namespace LanguageServers::Cpp {
+
+using namespace ::Cpp;
+
+class LexerAutoComplete {
+public:
+    LexerAutoComplete() = delete;
+
+    static Vector<GUI::AutocompleteProvider::Entry> get_suggestions(const String& code, const GUI::TextPosition& autocomplete_position);
+
+private:
+    static Optional<size_t> token_in_position(const Vector<Cpp::Token>&, const GUI::TextPosition&);
+    static StringView text_of_token(const Vector<String>& lines, const Cpp::Token&);
+    static Vector<GUI::AutocompleteProvider::Entry> identifier_prefixes(const Vector<String>& lines, const Vector<Cpp::Token>&, size_t target_token_index);
+};
+
+}