Method parse_single_command

userspace/programs/Shell/TokenParser.cpp:536–687

}

BAN::ErrorOr<SingleCommand> TokenParser::parse_single_command()
{
	SingleCommand result;

	while (peek_token().type() == Token::Type::Whitespace)
		consume_token();

	while (peek_token().type() == Token::Type::String)
	{
		BAN::String env_name;

		const auto& string = peek_token().string();
		if (!isalpha(string.front()))
			break;

		const auto env_len = string.sv().find([](char ch) { return !(isalnum(ch) || ch == '_'); });
		if (!env_len.has_value() || string[*env_len] != '=')
			break;
		TRY(env_name.append(string.sv().substring(0, *env_len)));

		auto full_value = TRY(parse_argument());
		ASSERT(!full_value.parts.empty());
		ASSERT(full_value.parts.front().has<CommandArgument::FixedString>());

		auto& first_arg = full_value.parts.front().get<CommandArgument::FixedString>();
		ASSERT(first_arg.value.sv().starts_with(env_name));
		ASSERT(first_arg.value[*env_len] == '=');
		for (size_t i = 0; i < *env_len + 1; i++)
			first_arg.value.remove(0);
		if (first_arg.value.empty())
			full_value.parts.remove(0);

		SingleCommand::EnvironmentVariable environment_variable;
		environment_variable.name = BAN::move(env_name);
		environment_variable.value = BAN::move(full_value);
		TRY(result.environment.emplace_back(BAN::move(environment_variable)));

		while (peek_token().type() == Token::Type::Whitespace)
			consume_token();
	}

	BAN::HashSet<BAN::String> used_aliases;
	while (peek_token().type() == Token::Type::String)
	{
		auto token = read_token();

		bool can_be_alias = false;
		switch (peek_token().type())
		{
			case Token::Type::EOF_:
			case Token::Type::Ampersand:
			case Token::Type::CloseParen:
			case Token::Type::Pipe:
			case Token::Type::Semicolon:
			case Token::Type::Whitespace:
				can_be_alias = true;
				break;
			case Token::Type::Backslash: