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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "LogCommandLineHandler.h"
#include "mozilla/Tokenizer.h"
#include "nsDebug.h"
namespace mozilla {
void LoggingHandleCommandLineArgs(
int argc, char const* const* argv,
std::function<void(nsACString const&)> const& consumer) {
// Keeps the name of a pending env var (MOZ_LOG or MOZ_LOG_FILE) that
// we expect to get a value for in the next iterated arg.
// Used for the `-MOZ_LOG <modules>` form of argument.
nsAutoCString env;
auto const names = {"MOZ_LOG"_ns, "MOZ_LOG_FILE"_ns};
for (int arg = 1; arg < argc; ++arg) {
Tokenizer p(argv[arg]);
if (!env.IsEmpty() && p.CheckChar('-')) {
NS_WARNING(
"Expects value after -MOZ_LOG(_FILE) argument, but another argument "
"found");
// We only expect values for the pending env var, start over
p.Rollback();
env.Truncate();
}
if (env.IsEmpty()) {
if (!p.CheckChar('-')) {
continue;
}
// We accept `-MOZ_LOG` as well as `--MOZ_LOG`.
Unused << p.CheckChar('-');
for (auto const& name : names) {
if (!p.CheckWord(name)) {
continue;
}
env.Assign(name);
env.Append('=');
break;
}
if (env.IsEmpty()) {
// An unknonwn argument, ignore.
continue;
}
// We accept `-MOZ_LOG <modules>` as well as `-MOZ_LOG=<modules>`.
if (p.CheckEOF()) {
// We have a lone `-MOZ_LOG` arg, the next arg is expected to be
// the value, |env| is now prepared as `MOZ_LOG=`.
continue;
}
if (!p.CheckChar('=')) {
// There is a character after the arg name and it's not '=',
// ignore this argument.
NS_WARNING("-MOZ_LOG(_FILE) argument not in a proper form");
env.Truncate();
continue;
}
}
// This can be non-empty from previous iteration or in this iteration.
if (!env.IsEmpty()) {
nsDependentCSubstring value;
Unused << p.ReadUntil(Tokenizer::Token::EndOfFile(), value);
env.Append(value);
consumer(env);
env.Truncate();
}
}
}
} // namespace mozilla