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/LexerChannelAction.cpp

@@ -0,0 +1,43 @@
+/* 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/LexerChannelAction.h"
+
+using namespace antlr4::atn;
+using namespace antlr4::misc;
+using namespace antlrcpp;
+
+LexerChannelAction::LexerChannelAction(int channel)
+    : LexerAction(LexerActionType::CHANNEL, false), _channel(channel) {}
+
+void LexerChannelAction::execute(Lexer *lexer) const {
+  lexer->setChannel(getChannel());
+}
+
+size_t LexerChannelAction::hashCodeImpl() const {
+  size_t hash = MurmurHash::initialize();
+  hash = MurmurHash::update(hash, static_cast<size_t>(getActionType()));
+  hash = MurmurHash::update(hash, getChannel());
+  return MurmurHash::finish(hash, 2);
+}
+
+bool LexerChannelAction::equals(const LexerAction &other) const {
+  if (this == std::addressof(other)) {
+    return true;
+  }
+  if (getActionType() != other.getActionType()) {
+    return false;
+  }
+  const auto &lexerAction = downCast<const LexerChannelAction&>(other);
+  return getChannel() == lexerAction.getChannel();
+}
+
+std::string LexerChannelAction::toString() const {
+  return "channel(" + std::to_string(getChannel()) + ")";
+}