fn compute_parameter_encodings(
    map: &BTreeMap<String, String>,
    decode_key_list: &Vec<String>,
) -> HashMap<String, (String, bool)> {
    // To handle section 4.1 (combining encodings with continuations), we first
    // compute the encoding for each parameter value or parameter value segment
    // that is encoded. For continuation segments the encoding from the *0 segment
    // overwrites the continuation segment's encoding, if there is one.
    let mut encodings: HashMap<String, (String, bool)> = HashMap::new();
    for decode_key in decode_key_list {
        if let Some(unwrap_key) = decode_key.strip_suffix("*0") {
            // Per spec, there should always be an encoding. If it's missing, handle that case gracefully
            // by setting it to an empty string that we handle specially later.
            let encoding = map
                .get(&format!("{}*", decode_key))
                .unwrap()
                .split('\'')
                .next()
                .unwrap_or("");
            let continuation_prefix = format!("{}*", unwrap_key);
            for continuation_key in decode_key_list {
                if continuation_key.starts_with(&continuation_prefix) {
                    // This may (intentionally) overwite encodings previously found for the
                    // continuation segments (which are bogus). In those cases, the flag
                    // in the tuple should get updated from true to false.
                    encodings.insert(
                        continuation_key.clone(),
                        (encoding.to_string(), continuation_key == decode_key),
                    );
                }
            }
        } else if !encodings.contains_key(decode_key) {
            let encoding = map
                .get(&format!("{}*", decode_key))
                .unwrap()
                .split('\'')
                .next()
                .unwrap_or("")
                .to_string();
            let old_value = encodings.insert(decode_key.clone(), (encoding, true));
            assert!(old_value.is_none());
        }
        // else this is a continuation segment and the encoding has already been populated
        // by the initial *0 segment, so we can ignore it.
    }
    encodings
}
/// In the returned map, the key is one of the entries from the decode_key_list,
/// (i.e. the parameter key with the trailing '*' stripped). The value is a tuple
/// containing the encoding (or empty string for no encoding found) and a flag
/// that indicates if the encoding needs to be stripped from the value. This is
/// set to true for non-continuation parameter values.
In the returned map, the key is one of the entries from the decode_key_list,
. The value is a tuple
containing the encoding (or empty string for no encoding found) and a flag
that indicates if the encoding needs to be stripped from the value. This is
set to true for non-continuation parameter values.
In the returned map the key is one of the entries from the decode_key_list . The value is a tuple containing the encoding ( or empty string for no encoding found ) and a flag that indicates if the encoding needs to be stripped from the value . This is set to true for non - continuation parameter values .
fn compute_parameter_encodings(
    map: &BTreeMap<String, String>,
    decode_key_list: &Vec<String>,
) -> HashMap<String, (String, bool)> {
    // To handle section 4.1 (combining encodings with continuations), we first
    // compute the encoding for each parameter value or parameter value segment
    // that is encoded. For continuation segments the encoding from the *0 segment
    // overwrites the continuation segment's encoding, if there is one.
    let mut encodings: HashMap<String, (String, bool)> = HashMap::new();
    for decode_key in decode_key_list {
        if let Some(unwrap_key) = decode_key.strip_suffix("*0") {
            // Per spec, there should always be an encoding. If it's missing, handle that case gracefully
            // by setting it to an empty string that we handle specially later.
            let encoding = map
                .get(&format!("{}*", decode_key))
                .unwrap()
                .split('\'')
                .next()
                .unwrap_or("");
            let continuation_prefix = format!("{}*", unwrap_key);
            for continuation_key in decode_key_list {
                if continuation_key.starts_with(&continuation_prefix) {
                    // This may (intentionally) overwite encodings previously found for the
                    // continuation segments (which are bogus). In those cases, the flag
                    // in the tuple should get updated from true to false.
                    encodings.insert(
                        continuation_key.clone(),
                        (encoding.to_string(), continuation_key == decode_key),
                    );
                }
            }
        } else if !encodings.contains_key(decode_key) {
            let encoding = map
                .get(&format!("{}*", decode_key))
                .unwrap()
                .split('\'')
                .next()
                .unwrap_or("")
                .to_string();
            let old_value = encodings.insert(decode_key.clone(), (encoding, true));
            assert!(old_value.is_none());
        }
        // else this is a continuation segment and the encoding has already been populated
        // by the initial *0 segment, so we can ignore it.
    }
    encodings
}
fn compute_parameter_encodings ( map : & BTreeMap < String , String > , decode_key_list : & Vec < String > , ) -> HashMap < String , ( String , bool ) > { // To handle section 4.1 (combining encodings with continuations), we first // compute the encoding for each parameter value or parameter value segment // that is encoded. For continuation segments the encoding from the *0 segment // overwrites the continuation segment's encoding, if there is one. let mut encodings : HashMap < String , ( String , bool ) > = HashMap :: new ( ) ; for decode_key in decode_key_list { if let Some ( unwrap_key ) = decode_key . strip_suffix ( " " ) { // Per spec, there should always be an encoding. If it's missing, handle that case gracefully // by setting it to an empty string that we handle specially later. let encoding = map . get ( & format ! ( " " decode_key ) ) . unwrap ( ) . split ( '\'' ) . next ( ) . unwrap_or ( " " ) ; let continuation_prefix = format ! ( " " unwrap_key ) ; for continuation_key in decode_key_list { if continuation_key . starts_with ( & continuation_prefix ) { // This may (intentionally) overwite encodings previously found for the // continuation segments (which are bogus). In those cases, the flag // in the tuple should get updated from true to false. encodings . insert ( continuation_key . clone ( ) , ( encoding . to_string ( ) , continuation_key == decode_key ) , ) ; } } } else if ! encodings . contains_key ( decode_key ) { let encoding = map . get ( & format ! ( " " decode_key ) ) . unwrap ( ) . split ( '\'' ) . next ( ) . unwrap_or ( " " ) . to_string ( ) ; let old_value = encodings . insert ( decode_key . clone ( ) , ( encoding , true ) ) ; assert ! ( old_value is_none ( ) ) ; } // else this is a continuation segment and the encoding has already been populated // by the initial *0 segment, so we can ignore it. } encodings }
In the returned map, the key is one of the entries from the decode_key_list,
(i.e.
In the returned map the key is one of the entries from the decode_key_list ( i . e .
map
&BTreeMap<String, String>
decode_key_list
&Vec<String>
map
&BTreeMap<String, String>
decode_key_list
&Vec<String>