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// 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 <cstddef>
#include <ostream>
#include <utility>
#include "base/basictypes.h"
#include "base/logging.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(min_log_level != NULL);
typedef std::pair<std::string, std::string> KVPair;
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 << "\"";
}
}
std::vector<KVPair> kv_pairs;
if (!base::SplitStringIntoKeyValuePairs(
vmodule_switch, '=', ',', &kv_pairs)) {
DLOG(WARNING) << "Could not fully parse vmodule switch \""
<< vmodule_switch << "\"";
}
for (std::vector<KVPair>::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() {}
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 = arraysize(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 (std::vector<VmodulePattern>::const_iterator it =
vmodule_levels_.begin(); it != vmodule_levels_.end(); ++it) {
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
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