add antlr

lib/antlr4/include/TokenFactory.h

@@ -0,0 +1,30 @@
+/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
+ * Use of this file is governed by the BSD 3-clause license that
+ * can be found in the LICENSE.txt file in the project root.
+ */
+
+#pragma once
+
+#include "antlr4-common.h"
+
+namespace antlr4 {
+
+  /// The default mechanism for creating tokens. It's used by default in Lexer and
+  ///  the error handling strategy (to create missing tokens).  Notifying the parser
+  ///  of a new factory means that it notifies it's token source and error strategy.
+  template<typename Symbol>
+  class ANTLR4CPP_PUBLIC TokenFactory {
+  public:
+    virtual ~TokenFactory() {}
+
+    /// This is the method used to create tokens in the lexer and in the
+    /// error handling strategy. If text!=null, than the start and stop positions
+    /// are wiped to -1 in the text override is set in the CommonToken.
+    virtual std::unique_ptr<Symbol> create(std::pair<TokenSource *, CharStream *> source, size_t type, const std::string &text,
+      size_t channel, size_t start, size_t stop, size_t line, size_t charPositionInLine) = 0;
+
+    /// Generically useful
+    virtual std::unique_ptr<Symbol> create(size_t type, const std::string &text) = 0;
+  };
+
+} // namespace antlr4