build(antlr): 引入第三方 ANTLR4 runtime/tool 并接入构建

third_party/antlr4-runtime-4.13.2/runtime/src/atn/LexerModeAction.cpp

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+/* 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.
+ */
+
+#include "misc/MurmurHash.h"
+#include "Lexer.h"
+#include "support/Casts.h"
+
+#include "atn/LexerModeAction.h"
+
+using namespace antlr4;
+using namespace antlr4::atn;
+using namespace antlr4::misc;
+using namespace antlrcpp;
+
+LexerModeAction::LexerModeAction(int mode) : LexerAction(LexerActionType::MODE, false), _mode(mode) {}
+
+void LexerModeAction::execute(Lexer *lexer) const {
+  lexer->setMode(getMode());
+}
+
+size_t LexerModeAction::hashCodeImpl() const {
+  size_t hash = MurmurHash::initialize();
+  hash = MurmurHash::update(hash, static_cast<size_t>(getActionType()));
+  hash = MurmurHash::update(hash, getMode());
+  return MurmurHash::finish(hash, 2);
+}
+
+bool LexerModeAction::equals(const LexerAction &other) const {
+  if (this == std::addressof(other)) {
+    return true;
+  }
+  if (getActionType() != other.getActionType()) {
+    return false;
+  }
+  const auto &lexerAction = downCast<const LexerModeAction&>(other);
+  return getMode() == lexerAction.getMode();
+}
+
+std::string LexerModeAction::toString() const {
+  return "mode(" + std::to_string(getMode()) + ")";
+}