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// Copyright 2010 The Chromium Authors
// 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/check_op.h"
#include "base/logging.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
namespace logging {
const int VlogInfo::kDefaultVlogLevel = 0;
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) {}
// static
std::vector<VlogInfo::VmodulePattern> VlogInfo::ParseVmoduleLevels(
const std::string& vmodule_switch) {
std::vector<VmodulePattern> vmodule_levels;
base::StringPairs kv_pairs;
if (!base::SplitStringIntoKeyValuePairs(vmodule_switch, '=', ',',
&kv_pairs)) {
DLOG(WARNING) << "Could not fully parse vmodule switch \"" << vmodule_switch
<< "\"";
}
for (const auto& pair : kv_pairs) {
VmodulePattern pattern(pair.first);
if (!base::StringToInt(pair.second, &pattern.vlog_level)) {
DLOG(WARNING) << "Parsed vlog level for \"" << pair.first << "="
<< pair.second << "\" as " << pattern.vlog_level;
}
vmodule_levels.push_back(pattern);
}
return vmodule_levels;
}
VlogInfo::VlogInfo(const std::string& v_switch,
const std::string& vmodule_switch,
int* min_log_level)
: vmodule_levels_(ParseVmoduleLevels(vmodule_switch)),
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 << "\"";
}
}
}
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(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 = std::size(kInlSuffix) - 1;
if (base::EndsWith(module, kInlSuffix))
module.remove_suffix(kInlSuffixLen);
return module;
}
} // namespace
int VlogInfo::GetVlogLevel(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_;
}
VlogInfo::VlogInfo(std::vector<VmodulePattern> vmodule_levels,
int* min_log_level)
: vmodule_levels_(std::move(vmodule_levels)),
min_log_level_(min_log_level) {}
VlogInfo* VlogInfo::WithSwitches(const std::string& vmodule_switch) const {
std::vector<VmodulePattern> vmodule_levels = vmodule_levels_;
std::vector<VmodulePattern> additional_vmodule_levels =
ParseVmoduleLevels(vmodule_switch);
vmodule_levels.insert(vmodule_levels.end(), additional_vmodule_levels.begin(),
additional_vmodule_levels.end());
return new VlogInfo(std::move(vmodule_levels), min_log_level_);
}
bool MatchVlogPattern(base::StringPiece string,
base::StringPiece vlog_pattern) {
// The code implements the glob matching using a greedy approach described in
// https://research.swtch.com/glob.
size_t s = 0, nexts = 0;
size_t p = 0, nextp = 0;
size_t slen = string.size(), plen = vlog_pattern.size();
while (s < slen || p < plen) {
if (p < plen) {
switch (vlog_pattern[p]) {
// A slash (forward or back) must match a slash (forward or back).
case '/':
case '\\':
if (s < slen && (string[s] == '/' || string[s] == '\\')) {
p++, s++;
continue;
}
break;
// A '?' matches anything.
case '?':
if (s < slen) {
p++, s++;
continue;
}
break;
case '*':
nextp = p;
nexts = s + 1;
p++;
continue;
// Anything else must match literally.
default:
if (s < slen && string[s] == vlog_pattern[p]) {
p++, s++;
continue;
}
break;
}
}
// Mismatch - maybe restart.
if (0 < nexts && nexts <= slen) {
p = nextp;
s = nexts;
continue;
}
return false;
}
return true;
}
} // namespace logging
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