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/*
* Copyright (C) 2010 The Android Open Source Project
*
* 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
*
* http://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 "parser.h"
#include <dirent.h>
#include <android-base/chrono_utils.h>
#include <android-base/logging.h>
#include <android-base/stringprintf.h>
#include <android-base/strings.h>
#include "tokenizer.h"
#include "util.h"
namespace android {
namespace init {
Parser::Parser() {}
void Parser::AddSectionParser(const std::string& name, std::unique_ptr<SectionParser> parser) {
section_parsers_[name] = std::move(parser);
}
void Parser::AddSingleLineParser(const std::string& prefix, LineCallback callback) {
line_callbacks_.emplace_back(prefix, callback);
}
void Parser::ParseData(const std::string& filename, const std::string& data, size_t* parse_errors) {
// TODO: Use a parser with const input and remove this copy
std::vector<char> data_copy(data.begin(), data.end());
data_copy.push_back('\0');
parse_state state;
state.line = 0;
state.ptr = &data_copy[0];
state.nexttoken = 0;
SectionParser* section_parser = nullptr;
int section_start_line = -1;
std::vector<std::string> args;
auto end_section = [&] {
if (section_parser == nullptr) return;
if (auto result = section_parser->EndSection(); !result) {
(*parse_errors)++;
LOG(ERROR) << filename << ": " << section_start_line << ": " << result.error();
}
section_parser = nullptr;
section_start_line = -1;
};
for (;;) {
switch (next_token(&state)) {
case T_EOF:
end_section();
return;
case T_NEWLINE:
state.line++;
if (args.empty()) break;
// If we have a line matching a prefix we recognize, call its callback and unset any
// current section parsers. This is meant for /sys/ and /dev/ line entries for
// uevent.
for (const auto& [prefix, callback] : line_callbacks_) {
if (android::base::StartsWith(args[0], prefix)) {
end_section();
if (auto result = callback(std::move(args)); !result) {
(*parse_errors)++;
LOG(ERROR) << filename << ": " << state.line << ": " << result.error();
}
break;
}
}
if (section_parsers_.count(args[0])) {
end_section();
section_parser = section_parsers_[args[0]].get();
section_start_line = state.line;
if (auto result =
section_parser->ParseSection(std::move(args), filename, state.line);
!result) {
(*parse_errors)++;
LOG(ERROR) << filename << ": " << state.line << ": " << result.error();
section_parser = nullptr;
}
} else if (section_parser) {
if (auto result = section_parser->ParseLineSection(std::move(args), state.line);
!result) {
(*parse_errors)++;
LOG(ERROR) << filename << ": " << state.line << ": " << result.error();
}
}
args.clear();
break;
case T_TEXT:
args.emplace_back(state.text);
break;
}
}
}
bool Parser::ParseConfigFile(const std::string& path, size_t* parse_errors) {
LOG(INFO) << "Parsing file " << path << "...";
android::base::Timer t;
auto config_contents = ReadFile(path);
if (!config_contents) {
LOG(ERROR) << "Unable to read config file '" << path << "': " << config_contents.error();
return false;
}
config_contents->push_back('\n'); // TODO: fix parse_config.
ParseData(path, *config_contents, parse_errors);
for (const auto& [section_name, section_parser] : section_parsers_) {
section_parser->EndFile();
}
LOG(VERBOSE) << "(Parsing " << path << " took " << t << ".)";
return true;
}
bool Parser::ParseConfigDir(const std::string& path, size_t* parse_errors) {
LOG(INFO) << "Parsing directory " << path << "...";
std::unique_ptr<DIR, decltype(&closedir)> config_dir(opendir(path.c_str()), closedir);
if (!config_dir) {
PLOG(ERROR) << "Could not import directory '" << path << "'";
return false;
}
dirent* current_file;
std::vector<std::string> files;
while ((current_file = readdir(config_dir.get()))) {
// Ignore directories and only process regular files.
if (current_file->d_type == DT_REG) {
std::string current_path =
android::base::StringPrintf("%s/%s", path.c_str(), current_file->d_name);
files.emplace_back(current_path);
}
}
// Sort first so we load files in a consistent order (bug 31996208)
std::sort(files.begin(), files.end());
for (const auto& file : files) {
if (!ParseConfigFile(file, parse_errors)) {
LOG(ERROR) << "could not import file '" << file << "'";
}
}
return true;
}
bool Parser::ParseConfig(const std::string& path) {
size_t parse_errors;
return ParseConfig(path, &parse_errors);
}
bool Parser::ParseConfig(const std::string& path, size_t* parse_errors) {
*parse_errors = 0;
if (is_dir(path.c_str())) {
return ParseConfigDir(path, parse_errors);
}
return ParseConfigFile(path, parse_errors);
}
} // namespace init
} // namespace android
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