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#[macro_export]
macro_rules! header_display {
( $type1:ty ) => {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::result::Result<(), std::fmt::Error> {
write!(f, "{}:{}", self.header_name(), self.value)
}
};
}
#[macro_export]
macro_rules! header {
( $header:ident, $name:expr, $types:ty ) => {
paste! {
#[derive(Debug, Eq, PartialEq, Clone)]
pub struct [<$header Value>] {
value: $types
}
impl [<$header Value>] {
const NAME: &'static str = $name;
pub fn new(value: $types) -> Self {
[<$header Value>] { value }
}
}
impl HeaderValue<$types> for [<$header Value>] {
fn header_type(&self) -> HeaderType {
HeaderType::$header
}
fn header_name(&self) -> &str {
[<$header Value>]::NAME
}
fn value(&self) -> &$types {
&self.value
}
}
impl std::fmt::Display for [<$header Value>] {
header_display!( $types );
}
impl FromStr for [<$header Value>] {
type Err = StompParseError;
fn from_str(input: &str) -> Result<Self, Self::Err> {
$types::from_str(input).map([<$header Value>]::new).map_err(|_|StompParseError::new("[<Error Parsing $header Value>]"))
}
}
}
};
}
#[macro_export]
macro_rules! headers {
( $( ($header:ident, $name:literal ,$types:ty ) ),* ) => {
#[derive(Debug, Eq, PartialEq, Clone)]
pub struct CustomValue {
name: String,
value: String
}
impl CustomValue {
pub fn new(name: String, value: String) -> Self {
CustomValue {
name,
value
}
}
}
impl HeaderValue<String> for CustomValue {
fn header_type(&self) -> HeaderType {
HeaderType::Custom(self.name.clone())
}
fn header_name(&self) -> &str {
&self.name
}
fn value(&self) -> &String {
&self.value
}
}
impl std::fmt::Display for CustomValue {
header_display!( String );
}
#[derive(Debug, Eq, PartialEq, Clone)]
pub enum HeaderType {
$(
$header
),*
,Custom(String)
}
impl FromStr for HeaderType {
type Err = StompParseError;
fn from_str(input: &str) -> std::result::Result<HeaderType, StompParseError> {
match(input) {
$(
$name => Ok(HeaderType::$header),
)*
name => Ok(HeaderType::Custom(name.to_owned()))
}
}
}
impl std::fmt::Display for HeaderType {
fn fmt(&self, formatter: &mut std::fmt::Formatter<'_>) -> std::result::Result<(), std::fmt::Error> {
match(self) {
$(HeaderType::$header => {
formatter.write_str($name)
})*
HeaderType::Custom(name) => {
formatter.write_str(name)
}
}
}
}
paste! {
$(
header!($header, $name ,$types );
pub fn [<parse_ $header _header>](input: String) -> Result<Header, StompParseError> {
[<$header Value>]::from_str(&input).map(Header::$header)
}
)*
#[derive(Debug, Eq, PartialEq, Clone)]
pub enum Header {
$(
$header([<$header Value>]),
)*
Custom(CustomValue)
}
pub mod parser {
#![allow(non_snake_case)]
use super::*;
pub type HeaderValueConverter = dyn Fn(String) -> Result<Header, StompParseError>;
pub fn find_header_parser(header_type: HeaderType) -> Box<HeaderValueConverter> {
match header_type {
$(
HeaderType::$header => Box::new([<parse_ $header _header>]),
)*
HeaderType::Custom(name) => {
let cloned = name.clone();
Box::new(move |value| Ok(Header::Custom(CustomValue{
name: (&cloned).clone(),
value
})))
}
}
}
$(
pub fn [<parse_ $header _header>](input: String) -> Result<Header, StompParseError> {
[<$header Value>]::from_str(&input).map(Header::$header)
}
)*
}
}
}
}