// Code generated by software.amazon.smithy.rust.codegen.smithy-rs. DO NOT EDIT.
pub(crate) fn de_rule_parameter_map<'a, I>(
    tokens: &mut ::std::iter::Peekable<I>,
) -> Result<Option<::std::collections::HashMap<::std::string::String, ::std::string::String>>, ::aws_smithy_json::deserialize::error::DeserializeError>
where
    I: Iterator<Item = Result<::aws_smithy_json::deserialize::Token<'a>, ::aws_smithy_json::deserialize::error::DeserializeError>>,
{
    match tokens.next().transpose()? {
        Some(::aws_smithy_json::deserialize::Token::ValueNull { .. }) => Ok(None),
        Some(::aws_smithy_json::deserialize::Token::StartObject { .. }) => {
            let mut map = ::std::collections::HashMap::new();
            loop {
                match tokens.next().transpose()? {
                    Some(::aws_smithy_json::deserialize::Token::EndObject { .. }) => break,
                    Some(::aws_smithy_json::deserialize::Token::ObjectKey { key, .. }) => {
                        let key = key.to_unescaped().map(|u| u.into_owned())?;
                        let value = ::aws_smithy_json::deserialize::token::expect_string_or_null(tokens.next())?
                            .map(|s| s.to_unescaped().map(|u| u.into_owned()))
                            .transpose()?;
                        if let Some(value) = value {
                            map.insert(key, value);
                        }
                    }
                    other => {
                        return Err(::aws_smithy_json::deserialize::error::DeserializeError::custom(format!(
                            "expected object key or end object, found: {:?}",
                            other
                        )))
                    }
                }
            }
            Ok(Some(map))
        }
        _ => Err(::aws_smithy_json::deserialize::error::DeserializeError::custom(
            "expected start object or null",
        )),
    }
}