//
// Copyright 2019 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/flags/parse.h"
#include <stdlib.h>
#include <algorithm>
#include <fstream>
#include <iostream>
#include <iterator>
#include <string>
#include <tuple>
#include <utility>
#include <vector>
#ifdef _WIN32
#include <windows.h>
#endif
#include "absl/base/attributes.h"
#include "absl/base/config.h"
#include "absl/base/const_init.h"
#include "absl/base/thread_annotations.h"
#include "absl/flags/config.h"
#include "absl/flags/flag.h"
#include "absl/flags/internal/commandlineflag.h"
#include "absl/flags/internal/flag.h"
#include "absl/flags/internal/parse.h"
#include "absl/flags/internal/private_handle_accessor.h"
#include "absl/flags/internal/program_name.h"
#include "absl/flags/internal/registry.h"
#include "absl/flags/internal/usage.h"
#include "absl/flags/usage.h"
#include "absl/flags/usage_config.h"
#include "absl/strings/ascii.h"
#include "absl/strings/str_cat.h"
#include "absl/strings/string_view.h"
#include "absl/strings/strip.h"
#include "absl/synchronization/mutex.h"
// --------------------------------------------------------------------
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace flags_internal {
namespace {
ABSL_CONST_INIT absl::Mutex processing_checks_guard(absl::kConstInit);
ABSL_CONST_INIT bool flagfile_needs_processing
ABSL_GUARDED_BY(processing_checks_guard) = false;
ABSL_CONST_INIT bool fromenv_needs_processing
ABSL_GUARDED_BY(processing_checks_guard) = false;
ABSL_CONST_INIT bool tryfromenv_needs_processing
ABSL_GUARDED_BY(processing_checks_guard) = false;
ABSL_CONST_INIT absl::Mutex specified_flags_guard(absl::kConstInit);
ABSL_CONST_INIT std::vector<const CommandLineFlag*>* specified_flags
ABSL_GUARDED_BY(specified_flags_guard) = nullptr;
struct SpecifiedFlagsCompare {
bool operator()(const CommandLineFlag* a, const CommandLineFlag* b) const {
return a->Name() < b->Name();
}
bool operator()(const CommandLineFlag* a, absl::string_view b) const {
return a->Name() < b;
}
bool operator()(absl::string_view a, const CommandLineFlag* b) const {
return a < b->Name();
}
};
} // namespace
} // namespace flags_internal
ABSL_NAMESPACE_END
} // namespace absl
ABSL_FLAG(std::vector<std::string>, flagfile, {},
"comma-separated list of files to load flags from")
.OnUpdate([]() {
if (absl::GetFlag(FLAGS_flagfile).empty()) return;
absl::MutexLock l(&absl::flags_internal::processing_checks_guard);
// Setting this flag twice before it is handled most likely an internal
// error and should be reviewed by developers.
if (absl::flags_internal::flagfile_needs_processing) {
ABSL_INTERNAL_LOG(WARNING, "flagfile set twice before it is handled");
}
absl::flags_internal::flagfile_needs_processing = true;
});
ABSL_FLAG(std::vector<std::string>, fromenv, {},
"comma-separated list of flags to set from the environment"
" [use 'export FLAGS_flag1=value']")
.OnUpdate([]() {
if (absl::GetFlag(FLAGS_fromenv).empty()) return;
absl::MutexLock l(&absl::flags_internal::processing_checks_guard);
// Setting this flag twice before it is handled most likely an internal
// error and should be reviewed by developers.
if (absl::flags_internal::fromenv_needs_processing) {
ABSL_INTERNAL_LOG(WARNING, "fromenv set twice before it is handled.");
}
absl::flags_internal::fromenv_needs_processing = true;
});
ABSL_FLAG(std::vector<std::string>, tryfromenv, {},
"comma-separated list of flags to try to set from the environment if "
"present")
.OnUpdate([]() {
if (absl::GetFlag(FLAGS_tryfromenv).empty()) return;
absl::MutexLock l(&absl::flags_internal::processing_checks_guard);
// Setting this flag twice before it is handled most likely an internal
// error and should be reviewed by developers.
if (absl::flags_internal::tryfromenv_needs_processing) {
ABSL_INTERNAL_LOG(WARNING,
"tryfromenv set twice before it is handled.");
}
absl::flags_internal::tryfromenv_needs_processing = true;
});
ABSL_FLAG(std::vector<std::string>, undefok, {},
"comma-separated list of flag names that it is okay to specify "
"on the command line even if the program does not define a flag "
"with that name");
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace flags_internal {
namespace {
class ArgsList {
public:
ArgsList() : next_arg_(0) {}
ArgsList(int argc, char* argv[]) : args_(argv, argv + argc), next_arg_(0) {}
explicit ArgsList(const std::vector<std::string>& args)
: args_(args), next_arg_(0) {}
// Returns success status: true if parsing successful, false otherwise.
bool ReadFromFlagfile(const std::string& flag_file_name);
int Size() const { return args_.size() - next_arg_; }
int FrontIndex() const { return next_arg_; }
absl::string_view Front() const { return args_[next_arg_]; }
void PopFront() { next_arg_++; }
private:
std::vector<std::string> args_;
int next_arg_;
};
bool ArgsList::ReadFromFlagfile(const std::string& flag_file_name) {
std::ifstream flag_file(flag_file_name);
if (!flag_file) {
flags_internal::ReportUsageError(
absl::StrCat("Can't open flagfile ", flag_file_name), true);
return false;
}
// This argument represents fake argv[0], which should be present in all arg
// lists.
args_.push_back("");
std::string line;
bool success = true;
while (std::getline(flag_file, line)) {
absl::string_view stripped = absl::StripLeadingAsciiWhitespace(line);
if (stripped.empty() || stripped[0] == '#') {
// Comment or empty line; just ignore.
continue;
}
if (stripped[0] == '-') {
if (stripped == "--") {
flags_internal::ReportUsageError(
"Flagfile can't contain position arguments or --", true);
success = false;
break;
}
args_.push_back(std::string(stripped));
continue;
}
flags_internal::ReportUsageError(
absl::StrCat("Unexpected line in the flagfile ", flag_file_name, ": ",
line),
true);
success = false;
}
return success;
}
// --------------------------------------------------------------------
// Reads the environment variable with name `name` and stores results in
// `value`. If variable is not present in environment returns false, otherwise
// returns true.
bool GetEnvVar(const char* var_name, std::string* var_value) {
#ifdef _WIN32
char buf[1024];
auto get_res = GetEnvironmentVariableA(var_name, buf, sizeof(buf));
if (get_res >= sizeof(buf)) {
return false;
}
if (get_res == 0) {
return false;
}
*var_value = std::string(buf, get_res);
#else
const char* val = ::getenv(var_name);
if (val == nullptr) {
return false;
}
*var_value = val;
#endif
return true;
}
// --------------------------------------------------------------------
// Returns:
// Flag name or empty if arg= --
// Flag value after = in --flag=value (empty if --foo)
// "Is empty value" status. True if arg= --foo=, false otherwise. This is
// required to separate --foo from --foo=.
// For example:
// arg return values
// "--foo=bar" -> {"foo", "bar", false}.
// "--foo" -> {"foo", "", false}.
// "--foo=" -> {"foo", "", true}.
std::tuple<absl::string_view, absl::string_view, bool> SplitNameAndValue(
absl::string_view arg) {
// Allow -foo and --foo
absl::ConsumePrefix(&arg, "-");
if (arg.empty()) {
return std::make_tuple("", "", false);
}
auto equal_sign_pos = arg.find("=");
absl::string_view flag_name = arg.substr(0, equal_sign_pos);
absl::string_view value;
bool is_empty_value = false;
if (equal_sign_pos != absl::string_view::npos) {
value = arg.substr(equal_sign_pos + 1);
is_empty_value = value.empty();
}
return std::make_tuple(flag_name, value, is_empty_value);
}
// --------------------------------------------------------------------
// Returns:
// found flag or nullptr
// is negative in case of --nofoo
std::tuple<CommandLineFlag*, bool> LocateFlag(absl::string_view flag_name) {
CommandLineFlag* flag = flags_internal::FindCommandLineFlag(flag_name);
bool is_negative = false;
if (!flag && absl::ConsumePrefix(&flag_name, "no")) {
flag = flags_internal::FindCommandLineFlag(flag_name);
is_negative = true;
}
return std::make_tuple(flag, is_negative);
}
// --------------------------------------------------------------------
// Verify that default values of typed flags must be convertible to string and
// back.
void CheckDefaultValuesParsingRoundtrip() {
#ifndef NDEBUG
flags_internal::ForEachFlag([&](CommandLineFlag* flag) {
if (flag->IsRetired()) return;
#define ABSL_FLAGS_INTERNAL_IGNORE_TYPE(T, _) \
if (flag->IsOfType<T>()) return;
ABSL_FLAGS_INTERNAL_SUPPORTED_TYPES(ABSL_FLAGS_INTERNAL_IGNORE_TYPE)
#undef ABSL_FLAGS_INTERNAL_IGNORE_TYPE
flags_internal::PrivateHandleAccessor::CheckDefaultValueParsingRoundtrip(
*flag);
});
#endif
}
// --------------------------------------------------------------------
// Returns success status, which is true if we successfully read all flag files,
// in which case new ArgLists are appended to the input_args in a reverse order
// of file names in the input flagfiles list. This order ensures that flags from
// the first flagfile in the input list are processed before the second flagfile
// etc.
bool ReadFlagfiles(const std::vector<std::string>& flagfiles,
std::vector<ArgsList>* input_args) {
bool success = true;
for (auto it = flagfiles.rbegin(); it != flagfiles.rend(); ++it) {
ArgsList al;
if (al.ReadFromFlagfile(*it)) {
input_args->push_back(al);
} else {
success = false;
}
}
return success;
}
// Returns success status, which is true if were able to locate all environment
// variables correctly or if fail_on_absent_in_env is false. The environment
// variable names are expected to be of the form `FLAGS_<flag_name>`, where
// `flag_name` is a string from the input flag_names list. If successful we
// append a single ArgList at the end of the input_args.
bool ReadFlagsFromEnv(const std::vector<std::string>& flag_names,
std::vector<ArgsList>* input_args,
bool fail_on_absent_in_env) {
bool success = true;
std::vector<std::string> args;
// This argument represents fake argv[0], which should be present in all arg
// lists.
args.push_back("");
for (const auto& flag_name : flag_names) {
// Avoid infinite recursion.
if (flag_name == "fromenv" || flag_name == "tryfromenv") {
flags_internal::ReportUsageError(
absl::StrCat("Infinite recursion on flag ", flag_name), true);
success = false;
continue;
}
const std::string envname = absl::StrCat("FLAGS_", flag_name);
std::string envval;
if (!GetEnvVar(envname.c_str(), &envval)) {
if (fail_on_absent_in_env) {
flags_internal::ReportUsageError(
absl::StrCat(envname, " not found in environment"), true);
success = false;
}
continue;
}
args.push_back(absl::StrCat("--", flag_name, "=", envval));
}
if (success) {
input_args->emplace_back(args);
}
return success;
}
// --------------------------------------------------------------------
// Returns success status, which is true if were able to handle all generator
// flags (flagfile, fromenv, tryfromemv) successfully.
bool HandleGeneratorFlags(std::vector<ArgsList>* input_args,
std::vector<std::string>* flagfile_value) {
bool success = true;
absl::MutexLock l(&flags_internal::processing_checks_guard);
// flagfile could have been set either on a command line or
// programmatically before invoking ParseCommandLine. Note that we do not
// actually process arguments specified in the flagfile, but instead
// create a secondary arguments list to be processed along with the rest
// of the comamnd line arguments. Since we always the process most recently
// created list of arguments first, this will result in flagfile argument
// being processed before any other argument in the command line. If
// FLAGS_flagfile contains more than one file name we create multiple new
// levels of arguments in a reverse order of file names. Thus we always
// process arguments from first file before arguments containing in a
// second file, etc. If flagfile contains another
// --flagfile inside of it, it will produce new level of arguments and
// processed before the rest of the flagfile. We are also collecting all
// flagfiles set on original command line. Unlike the rest of the flags,
// this flag can be set multiple times and is expected to be handled
// multiple times. We are collecting them all into a single list and set
// the value of FLAGS_flagfile to that value at the end of the parsing.
if (flags_internal::flagfile_needs_processing) {
auto flagfiles = absl::GetFlag(FLAGS_flagfile);
if (input_args->size() == 1) {
flagfile_value->insert(flagfile_value->end(), flagfiles.begin(),
flagfiles.end());
}
success &= ReadFlagfiles(flagfiles, input_args);
flags_internal::flagfile_needs_processing = false;
}
// Similar to flagfile fromenv/tryfromemv can be set both
// programmatically and at runtime on a command line. Unlike flagfile these
// can't be recursive.
if (flags_internal::fromenv_needs_processing) {
auto flags_list = absl::GetFlag(FLAGS_fromenv);
success &= ReadFlagsFromEnv(flags_list, input_args, true);
flags_internal::fromenv_needs_processing = false;
}
if (flags_internal::tryfromenv_needs_processing) {
auto flags_list = absl::GetFlag(FLAGS_tryfromenv);
success &= ReadFlagsFromEnv(flags_list, input_args, false);
flags_internal::tryfromenv_needs_processing = false;
}
return success;
}
// --------------------------------------------------------------------
void ResetGeneratorFlags(const std::vector<std::string>& flagfile_value) {
// Setting flagfile to the value which collates all the values set on a
// command line and programmatically. So if command line looked like
// --flagfile=f1 --flagfile=f2 the final value of the FLAGS_flagfile flag is
// going to be {"f1", "f2"}
if (!flagfile_value.empty()) {
absl::SetFlag(&FLAGS_flagfile, flagfile_value);
absl::MutexLock l(&flags_internal::processing_checks_guard);
flags_internal::flagfile_needs_processing = false;
}
// fromenv/tryfromenv are set to <undefined> value.
if (!absl::GetFlag(FLAGS_fromenv).empty()) {
absl::SetFlag(&FLAGS_fromenv, {});
}
if (!absl::GetFlag(FLAGS_tryfromenv).empty()) {
absl::SetFlag(&FLAGS_tryfromenv, {});
}
absl::MutexLock l(&flags_internal::processing_checks_guard);
flags_internal::fromenv_needs_processing = false;
flags_internal::tryfromenv_needs_processing = false;
}
// --------------------------------------------------------------------
// Returns:
// success status
// deduced value
// We are also mutating curr_list in case if we need to get a hold of next
// argument in the input.
std::tuple<bool, absl::string_view> DeduceFlagValue(const CommandLineFlag& flag,
absl::string_view value,
bool is_negative,
bool is_empty_value,
ArgsList* curr_list) {
// Value is either an argument suffix after `=` in "--foo=<value>"
// or separate argument in case of "--foo" "<value>".
// boolean flags have these forms:
// --foo
// --nofoo
// --foo=true
// --foo=false
// --nofoo=<value> is not supported
// --foo <value> is not supported
// non boolean flags have these forms:
// --foo=<value>
// --foo <value>
// --nofoo is not supported
if (flag.IsOfType<bool>()) {
if (value.empty()) {
if (is_empty_value) {
// "--bool_flag=" case
flags_internal::ReportUsageError(
absl::StrCat(
"Missing the value after assignment for the boolean flag '",
flag.Name(), "'"),
true);
return std::make_tuple(false, "");
}
// "--bool_flag" case
value = is_negative ? "0" : "1";
} else if (is_negative) {
// "--nobool_flag=Y" case
flags_internal::ReportUsageError(
absl::StrCat("Negative form with assignment is not valid for the "
"boolean flag '",
flag.Name(), "'"),
true);
return std::make_tuple(false, "");
}
} else if (is_negative) {
// "--noint_flag=1" case
flags_internal::ReportUsageError(
absl::StrCat("Negative form is not valid for the flag '", flag.Name(),
"'"),
true);
return std::make_tuple(false, "");
} else if (value.empty() && (!is_empty_value)) {
if (curr_list->Size() == 1) {
// "--int_flag" case
flags_internal::ReportUsageError(
absl::StrCat("Missing the value for the flag '", flag.Name(), "'"),
true);
return std::make_tuple(false, "");
}
// "--int_flag" "10" case
curr_list->PopFront();
value = curr_list->Front();
// Heuristic to detect the case where someone treats a string arg
// like a bool or just forgets to pass a value:
// --my_string_var --foo=bar
// We look for a flag of string type, whose value begins with a
// dash and corresponds to known flag or standalone --.
if (!value.empty() && value[0] == '-' && flag.IsOfType<std::string>()) {
auto maybe_flag_name = std::get<0>(SplitNameAndValue(value.substr(1)));
if (maybe_flag_name.empty() ||
std::get<0>(LocateFlag(maybe_flag_name)) != nullptr) {
// "--string_flag" "--known_flag" case
ABSL_INTERNAL_LOG(
WARNING,
absl::StrCat("Did you really mean to set flag '", flag.Name(),
"' to the value '", value, "'?"));
}
}
}
return std::make_tuple(true, value);
}
// --------------------------------------------------------------------
bool CanIgnoreUndefinedFlag(absl::string_view flag_name) {
auto undefok = absl::GetFlag(FLAGS_undefok);
if (std::find(undefok.begin(), undefok.end(), flag_name) != undefok.end()) {
return true;
}
if (absl::ConsumePrefix(&flag_name, "no") &&
std::find(undefok.begin(), undefok.end(), flag_name) != undefok.end()) {
return true;
}
return false;
}
} // namespace
// --------------------------------------------------------------------
bool WasPresentOnCommandLine(absl::string_view flag_name) {
absl::MutexLock l(&specified_flags_guard);
ABSL_INTERNAL_CHECK(specified_flags != nullptr,
"ParseCommandLine is not invoked yet");
return std::binary_search(specified_flags->begin(), specified_flags->end(),
flag_name, SpecifiedFlagsCompare{});
}
// --------------------------------------------------------------------
std::vector<char*> ParseCommandLineImpl(int argc, char* argv[],
ArgvListAction arg_list_act,
UsageFlagsAction usage_flag_act,
OnUndefinedFlag on_undef_flag) {
ABSL_INTERNAL_CHECK(argc > 0, "Missing argv[0]");
// This routine does not return anything since we abort on failure.
CheckDefaultValuesParsingRoundtrip();
std::vector<std::string> flagfile_value;
std::vector<ArgsList> input_args;
input_args.push_back(ArgsList(argc, argv));
std::vector<char*> output_args;
std::vector<char*> positional_args;
output_args.reserve(argc);
// This is the list of undefined flags. The element of the list is the pair
// consisting of boolean indicating if flag came from command line (vs from
// some flag file we've read) and flag name.
// TODO(rogeeff): Eliminate the first element in the pair after cleanup.
std::vector<std::pair<bool, std::string>> undefined_flag_names;
// Set program invocation name if it is not set before.
if (ProgramInvocationName() == "UNKNOWN") {
flags_internal::SetProgramInvocationName(argv[0]);
}
output_args.push_back(argv[0]);
absl::MutexLock l(&specified_flags_guard);
if (specified_flags == nullptr) {
specified_flags = new std::vector<const CommandLineFlag*>;
} else {
specified_flags->clear();
}
// Iterate through the list of the input arguments. First level are arguments
// originated from argc/argv. Following levels are arguments originated from
// recursive parsing of flagfile(s).
bool success = true;
while (!input_args.empty()) {
// 10. First we process the built-in generator flags.
success &= HandleGeneratorFlags(&input_args, &flagfile_value);
// 30. Select top-most (most recent) arguments list. If it is empty drop it
// and re-try.
ArgsList& curr_list = input_args.back();
curr_list.PopFront();
if (curr_list.Size() == 0) {
input_args.pop_back();
continue;
}
// 40. Pick up the front remaining argument in the current list. If current
// stack of argument lists contains only one element - we are processing an
// argument from the original argv.
absl::string_view arg(curr_list.Front());
bool arg_from_argv = input_args.size() == 1;
// 50. If argument does not start with - or is just "-" - this is
// positional argument.
if (!absl::ConsumePrefix(&arg, "-") || arg.empty()) {
ABSL_INTERNAL_CHECK(arg_from_argv,
"Flagfile cannot contain positional argument");
positional_args.push_back(argv[curr_list.FrontIndex()]);
continue;
}
if (arg_from_argv && (arg_list_act == ArgvListAction::kKeepParsedArgs)) {
output_args.push_back(argv[curr_list.FrontIndex()]);
}
// 60. Split the current argument on '=' to figure out the argument
// name and value. If flag name is empty it means we've got "--". value
// can be empty either if there were no '=' in argument string at all or
// an argument looked like "--foo=". In a latter case is_empty_value is
// true.
absl::string_view flag_name;
absl::string_view value;
bool is_empty_value = false;
std::tie(flag_name, value, is_empty_value) = SplitNameAndValue(arg);
// 70. "--" alone means what it does for GNU: stop flags parsing. We do
// not support positional arguments in flagfiles, so we just drop them.
if (flag_name.empty()) {
ABSL_INTERNAL_CHECK(arg_from_argv,
"Flagfile cannot contain positional argument");
curr_list.PopFront();
break;
}
// 80. Locate the flag based on flag name. Handle both --foo and --nofoo
CommandLineFlag* flag = nullptr;
bool is_negative = false;
std::tie(flag, is_negative) = LocateFlag(flag_name);
if (flag == nullptr) {
if (on_undef_flag != OnUndefinedFlag::kIgnoreUndefined) {
undefined_flag_names.emplace_back(arg_from_argv,
std::string(flag_name));
}
continue;
}
// 90. Deduce flag's value (from this or next argument)
auto curr_index = curr_list.FrontIndex();
bool value_success = true;
std::tie(value_success, value) =
DeduceFlagValue(*flag, value, is_negative, is_empty_value, &curr_list);
success &= value_success;
// If above call consumed an argument, it was a standalone value
if (arg_from_argv && (arg_list_act == ArgvListAction::kKeepParsedArgs) &&
(curr_index != curr_list.FrontIndex())) {
output_args.push_back(argv[curr_list.FrontIndex()]);
}
// 100. Set the located flag to a new new value, unless it is retired.
// Setting retired flag fails, but we ignoring it here.
if (flag->IsRetired()) continue;
std::string error;
if (!flags_internal::PrivateHandleAccessor::ParseFrom(
flag, value, SET_FLAGS_VALUE, kCommandLine, &error)) {
flags_internal::ReportUsageError(error, true);
success = false;
} else {
specified_flags->push_back(flag);
}
}
for (const auto& flag_name : undefined_flag_names) {
if (CanIgnoreUndefinedFlag(flag_name.second)) continue;
flags_internal::ReportUsageError(
absl::StrCat("Unknown command line flag '", flag_name.second, "'"),
true);
success = false;
}
#if ABSL_FLAGS_STRIP_NAMES
if (!success) {
flags_internal::ReportUsageError(
"NOTE: command line flags are disabled in this build", true);
}
#endif
if (!success) {
flags_internal::HandleUsageFlags(std::cout,
ProgramUsageMessage());
std::exit(1);
}
if (usage_flag_act == UsageFlagsAction::kHandleUsage) {
int exit_code = flags_internal::HandleUsageFlags(
std::cout, ProgramUsageMessage());
if (exit_code != -1) {
std::exit(exit_code);
}
}
ResetGeneratorFlags(flagfile_value);
// Reinstate positional args which were intermixed with flags in the arguments
// list.
for (auto arg : positional_args) {
output_args.push_back(arg);
}
// All the remaining arguments are positional.
if (!input_args.empty()) {
for (int arg_index = input_args.back().FrontIndex(); arg_index < argc;
++arg_index) {
output_args.push_back(argv[arg_index]);
}
}
// Trim and sort the vector.
specified_flags->shrink_to_fit();
std::sort(specified_flags->begin(), specified_flags->end(),
SpecifiedFlagsCompare{});
return output_args;
}
} // namespace flags_internal
// --------------------------------------------------------------------
std::vector<char*> ParseCommandLine(int argc, char* argv[]) {
return flags_internal::ParseCommandLineImpl(
argc, argv, flags_internal::ArgvListAction::kRemoveParsedArgs,
flags_internal::UsageFlagsAction::kHandleUsage,
flags_internal::OnUndefinedFlag::kAbortIfUndefined);
}
ABSL_NAMESPACE_END
} // namespace absl
