Method LoadFromDisk

src/ini_load.cpp:185–266

* Load the Ini file's data from the disk. * @param filename the file to load. * @param subdir the sub directory to load the file from. * @pre nothing has been loaded yet. */

 * @pre nothing has been loaded yet.
 */
void IniLoadFile::LoadFromDisk(std::string_view filename, Subdirectory subdir)
{
	assert(this->groups.empty());

	char buffer[1024];
	IniGroup *group = nullptr;

	std::string comment;

	size_t end;
	auto in = this->OpenFile(filename, subdir, &end);
	if (!in.has_value()) return;

	end += ftell(*in);

	size_t line = 0;
	/* for each line in the file */
	while (static_cast<size_t>(ftell(*in)) < end && fgets(buffer, sizeof(buffer), *in)) {
		++line;
		StringConsumer consumer{StrTrimView(buffer, StringConsumer::WHITESPACE_OR_NEWLINE)};

		/* Skip comments and empty lines outside IGT_SEQUENCE groups. */
		if ((group == nullptr || group->type != IGT_SEQUENCE) && (!consumer.AnyBytesLeft() || consumer.PeekCharIfIn("#;"))) {
			comment += consumer.GetOrigData();
			comment += "\n";
			continue;
		}

		/* it's a group? */
		if (consumer.ReadCharIf('[')) {
			std::string_view group_name = consumer.ReadUntilChar(']', StringConsumer::KEEP_SEPARATOR);
			if (!consumer.ReadCharIf(']') || consumer.AnyBytesLeft()) {
				this->ReportFileError(fmt::format("ini [{}]: invalid group name '{}'", line, consumer.GetOrigData()));
			}
			group = &this->CreateGroup(group_name);
			group->comment = std::move(comment);
			comment.clear(); // std::move leaves comment in a "valid but unspecified state" according to the specification.
		} else if (group != nullptr) {
			if (group->type == IGT_SEQUENCE) {
				/* A sequence group, use the line as item name without further interpretation. */
				IniItem &item = group->CreateItem(consumer.GetOrigData());
				item.comment = std::move(comment);
				comment.clear(); // std::move leaves comment in a "valid but unspecified state" according to the specification.
				continue;
			}

			static const std::string_view key_parameter_separators = "=\t ";
			std::string_view key;
			/* find end of keyname */
			if (consumer.ReadCharIf('\"')) {
				key = consumer.ReadUntilChar('\"', StringConsumer::SKIP_ONE_SEPARATOR);
			} else {
				key = consumer.ReadUntilCharIn(key_parameter_separators);
			}

			/* it's an item in an existing group */
			IniItem &item = group->CreateItem(key);
			item.comment = std::move(comment);