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80b1296a05
Summary: cpptoml has traversal functionality for table reads, but not for writes. Add a helper function for reading a config value and updating the TOML table if it's unset. Reviewed By: fanzeyi Differential Revision: D19671264 fbshipit-source-id: e2b78d338af35d51fddaa258b7f45f8966d00a26
99 lines
2.6 KiB
C++
99 lines
2.6 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This software may be used and distributed according to the terms of the
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* GNU General Public License version 2.
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*/
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#pragma once
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#include <cpptoml.h> // @manual=fbsource//third-party/cpptoml:cpptoml
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#include <folly/Range.h>
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#include <folly/String.h>
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#include <glog/logging.h>
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namespace facebook {
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namespace eden {
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class TomlPath {
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public:
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/*implicit*/ constexpr TomlPath(
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std::initializer_list<folly::StringPiece> list)
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: begin_{list.begin()}, end_{list.end()} {}
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constexpr TomlPath(
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const folly::StringPiece* begin,
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const folly::StringPiece* end)
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: begin_{begin}, end_{end} {}
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constexpr const folly::StringPiece* begin() const {
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return begin_;
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}
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constexpr const folly::StringPiece* end() const {
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return end_;
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}
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constexpr size_t size() const {
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return end_ - begin_;
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}
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private:
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const folly::StringPiece* begin_;
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const folly::StringPiece* end_;
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};
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/**
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* Given a root toml table, walks the table path given by key, and sets it to
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* defaultValue if not set.
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*
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* Returns a pair of the value at the given key (whether or not it was set) and
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* a boolean indicating whether the table was modified.
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*
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* Throws std::domain_error if the path through `root` specified by `key`
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* contains non-table values.
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*/
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template <typename T>
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std::pair<T, bool>
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setDefault(cpptoml::table& root, TomlPath key, const T& defaultValue) {
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// TODO: Much of this function could be moved into the .cpp file.
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DCHECK_GE(key.size(), 1);
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auto begin = key.begin();
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const auto end = key.end();
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cpptoml::table* table = &root;
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for (; begin + 1 < end; ++begin) {
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auto keystr = begin->str();
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if (table->contains(keystr)) {
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auto entry = table->get(keystr);
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if (entry->is_table()) {
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table = static_cast<cpptoml::table*>(entry.get());
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} else {
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throw std::runtime_error(
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folly::join(".", key.begin(), begin + 1) + " is not a table");
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}
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} else {
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auto entry = cpptoml::make_table();
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auto newtable = entry.get();
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table->insert(keystr, std::move(entry));
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table = newtable;
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}
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}
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auto keystr = begin->str();
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if (table->contains(keystr)) {
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if (auto value = table->get(keystr)->as<T>()) {
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return std::make_pair(value->get(), false);
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} else {
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throw std::runtime_error(
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folly::join(".", key.begin(), key.end()) + " has mismatched type");
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}
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}
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table->insert(begin->str(), defaultValue);
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return std::make_pair(defaultValue, true);
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}
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} // namespace eden
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} // namespace facebook
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