Include RE2 library

third_party/re2/util/logging.h

Index: third_party/re2/util/logging.h
diff --git a/third_party/re2/util/logging.h b/third_party/re2/util/logging.h
new file mode 100644
index 0000000000000000000000000000000000000000..53f7198c8ac3e8d81cfb4ca1801ec3031c3e2db9
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+++ b/third_party/re2/util/logging.h
@@ -0,0 +1,83 @@
+// Copyright 2009 The RE2 Authors.  All Rights Reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Simplified version of Google's logging.
+
+#ifndef RE2_UTIL_LOGGING_H__
+#define RE2_UTIL_LOGGING_H__
+
+#ifndef WIN32
+#include <unistd.h>  /* for write */
+#endif
+#include <sstream>
+#ifdef WIN32
+#include <io.h>
+#endif
+
+// Debug-only checking.
+#define DCHECK(condition) assert(condition)
+#define DCHECK_EQ(val1, val2) assert((val1) == (val2))
+#define DCHECK_NE(val1, val2) assert((val1) != (val2))
+#define DCHECK_LE(val1, val2) assert((val1) <= (val2))
+#define DCHECK_LT(val1, val2) assert((val1) < (val2))
+#define DCHECK_GE(val1, val2) assert((val1) >= (val2))
+#define DCHECK_GT(val1, val2) assert((val1) > (val2))
+
+// Always-on checking
+#define CHECK(x)	if(x){}else LogMessageFatal(__FILE__, __LINE__).stream() << "Check failed: " #x
+#define CHECK_LT(x, y)	CHECK((x) < (y))
+#define CHECK_GT(x, y)	CHECK((x) > (y))
+#define CHECK_LE(x, y)	CHECK((x) <= (y))
+#define CHECK_GE(x, y)	CHECK((x) >= (y))
+#define CHECK_EQ(x, y)	CHECK((x) == (y))
+#define CHECK_NE(x, y)	CHECK((x) != (y))
+
+#define LOG_INFO LogMessage(__FILE__, __LINE__)
+#define LOG_ERROR LOG_INFO
+#define LOG_WARNING LOG_INFO
+#define LOG_FATAL LogMessageFatal(__FILE__, __LINE__)
+#define LOG_QFATAL LOG_FATAL
+
+#define VLOG(x) if((x)>0){}else LOG_INFO.stream()
+
+#ifdef NDEBUG
+#define DEBUG_MODE 0
+#define LOG_DFATAL LOG_ERROR
+#else
+#define DEBUG_MODE 1
+#define LOG_DFATAL LOG_FATAL
+#endif
+
+#define LOG(severity) LOG_ ## severity.stream()
+
+class LogMessage {
+ public:
+  LogMessage(const char* file, int line) {
+    stream() << file << ":" << line << ": ";
+  }
+  ~LogMessage() {
+    stream() << "\n";
+    string s = str_.str();
+    if(write(2, s.data(), s.size()) < 0) {}  // shut up gcc
+  }
+  ostream& stream() { return str_; }
+ 
+ private:
+  std::ostringstream str_;
+  DISALLOW_EVIL_CONSTRUCTORS(LogMessage);
+};
+
+class LogMessageFatal : public LogMessage {
+ public:
+  LogMessageFatal(const char* file, int line)
+    : LogMessage(file, line) { }
+  ~LogMessageFatal() {
+    std::cerr << "\n";
+    abort();
+  }
+ private:
+  DISALLOW_EVIL_CONSTRUCTORS(LogMessageFatal);
+};
+
+#endif  // RE2_UTIL_LOGGING_H__