Repo created

TMessagesProj/jni/voip/webrtc/base/vlog.cc

@@ -0,0 +1,180 @@
+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/vlog.h"
+
+#include <stddef.h>
+
+#include <ostream>
+#include <utility>
+
+#include "base/logging.h"
+#include "base/stl_util.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/strings/string_split.h"
+
+namespace logging {
+
+const int VlogInfo::kDefaultVlogLevel = 0;
+
+struct VlogInfo::VmodulePattern {
+  enum MatchTarget { MATCH_MODULE, MATCH_FILE };
+
+  explicit VmodulePattern(const std::string& pattern);
+
+  VmodulePattern();
+
+  std::string pattern;
+  int vlog_level;
+  MatchTarget match_target;
+};
+
+VlogInfo::VmodulePattern::VmodulePattern(const std::string& pattern)
+    : pattern(pattern),
+      vlog_level(VlogInfo::kDefaultVlogLevel),
+      match_target(MATCH_MODULE) {
+  // If the pattern contains a {forward,back} slash, we assume that
+  // it's meant to be tested against the entire __FILE__ string.
+  std::string::size_type first_slash = pattern.find_first_of("\\/");
+  if (first_slash != std::string::npos)
+    match_target = MATCH_FILE;
+}
+
+VlogInfo::VmodulePattern::VmodulePattern()
+    : vlog_level(VlogInfo::kDefaultVlogLevel),
+      match_target(MATCH_MODULE) {}
+
+VlogInfo::VlogInfo(const std::string& v_switch,
+                   const std::string& vmodule_switch,
+                   int* min_log_level)
+    : min_log_level_(min_log_level) {
+  DCHECK_NE(min_log_level, nullptr);
+
+  int vlog_level = 0;
+  if (!v_switch.empty()) {
+    if (base::StringToInt(v_switch, &vlog_level)) {
+      SetMaxVlogLevel(vlog_level);
+    } else {
+      DLOG(WARNING) << "Could not parse v switch \"" << v_switch << "\"";
+    }
+  }
+
+  base::StringPairs kv_pairs;
+  if (!base::SplitStringIntoKeyValuePairs(
+          vmodule_switch, '=', ',', &kv_pairs)) {
+    DLOG(WARNING) << "Could not fully parse vmodule switch \""
+                  << vmodule_switch << "\"";
+  }
+  for (base::StringPairs::const_iterator it = kv_pairs.begin();
+       it != kv_pairs.end(); ++it) {
+    VmodulePattern pattern(it->first);
+    if (!base::StringToInt(it->second, &pattern.vlog_level)) {
+      DLOG(WARNING) << "Parsed vlog level for \""
+                    << it->first << "=" << it->second
+                    << "\" as " << pattern.vlog_level;
+    }
+    vmodule_levels_.push_back(pattern);
+  }
+}
+
+VlogInfo::~VlogInfo() = default;
+
+namespace {
+
+// Given a path, returns the basename with the extension chopped off
+// (and any -inl suffix).  We avoid using FilePath to minimize the
+// number of dependencies the logging system has.
+base::StringPiece GetModule(const base::StringPiece& file) {
+  base::StringPiece module(file);
+  base::StringPiece::size_type last_slash_pos =
+      module.find_last_of("\\/");
+  if (last_slash_pos != base::StringPiece::npos)
+    module.remove_prefix(last_slash_pos + 1);
+  base::StringPiece::size_type extension_start = module.rfind('.');
+  module = module.substr(0, extension_start);
+  static const char kInlSuffix[] = "-inl";
+  static const int kInlSuffixLen = base::size(kInlSuffix) - 1;
+  if (module.ends_with(kInlSuffix))
+    module.remove_suffix(kInlSuffixLen);
+  return module;
+}
+
+}  // namespace
+
+int VlogInfo::GetVlogLevel(const base::StringPiece& file) const {
+  if (!vmodule_levels_.empty()) {
+    base::StringPiece module(GetModule(file));
+    for (const auto& it : vmodule_levels_) {
+      base::StringPiece target(
+          (it.match_target == VmodulePattern::MATCH_FILE) ? file : module);
+      if (MatchVlogPattern(target, it.pattern))
+        return it.vlog_level;
+    }
+  }
+  return GetMaxVlogLevel();
+}
+
+void VlogInfo::SetMaxVlogLevel(int level) {
+  // Log severity is the negative verbosity.
+  *min_log_level_ = -level;
+}
+
+int VlogInfo::GetMaxVlogLevel() const {
+  return -*min_log_level_;
+}
+
+bool MatchVlogPattern(const base::StringPiece& string,
+                      const base::StringPiece& vlog_pattern) {
+  base::StringPiece p(vlog_pattern);
+  base::StringPiece s(string);
+  // Consume characters until the next star.
+  while (!p.empty() && !s.empty() && (p[0] != '*')) {
+    switch (p[0]) {
+      // A slash (forward or back) must match a slash (forward or back).
+      case '/':
+      case '\\':
+        if ((s[0] != '/') && (s[0] != '\\'))
+          return false;
+        break;
+
+      // A '?' matches anything.
+      case '?':
+        break;
+
+      // Anything else must match literally.
+      default:
+        if (p[0] != s[0])
+          return false;
+        break;
+    }
+    p.remove_prefix(1), s.remove_prefix(1);
+  }
+
+  // An empty pattern here matches only an empty string.
+  if (p.empty())
+    return s.empty();
+
+  // Coalesce runs of consecutive stars.  There should be at least
+  // one.
+  while (!p.empty() && (p[0] == '*'))
+    p.remove_prefix(1);
+
+  // Since we moved past the stars, an empty pattern here matches
+  // anything.
+  if (p.empty())
+    return true;
+
+  // Since we moved past the stars and p is non-empty, if some
+  // non-empty substring of s matches p, then we ourselves match.
+  while (!s.empty()) {
+    if (MatchVlogPattern(s, p))
+      return true;
+    s.remove_prefix(1);
+  }
+
+  // Otherwise, we couldn't find a match.
+  return false;
+}
+
+}  // namespace logging