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use crate::slice::types::IceType;
use quote::{__private::TokenStream, quote};
use super::struct_member::StructMember;
#[derive(Clone, Debug)]
pub struct Class {
pub id: TokenStream,
pub ice_id: String,
pub members: Vec<StructMember>,
pub extends: Option<IceType>,
}
impl Class {
pub fn empty() -> Class {
Class {
id: TokenStream::new(),
ice_id: String::new(),
members: Vec::new(),
extends: None
}
}
pub fn add_member(&mut self, member: StructMember) {
self.members.push(member);
}
pub fn generate(&self, mod_path: &str) -> Result<TokenStream, Box<dyn std::error::Error>> {
let id_token = &self.id;
let type_id_token = format!("{}::{}", mod_path, self.ice_id);
let mut member_tokens = self.members.iter().map(|member| {
member.declare()
}).collect::<Vec<_>>();
let member_from_bytes_tokens = self.members.iter().map(|member| {
let id_token = &member.id;
let var_token = &member.r#type.token_from();
match member.r#type {
IceType::Optional(_, _) => {
quote! {
let mut #id_token = None
}
}
_ => {
quote! {
let #id_token = #var_token::from_bytes(&bytes[read as usize..bytes.len()], &mut read)?
}
}
}
}).collect::<Vec<_>>();
let member_to_bytes_tokens = self.members.iter().map(|member| {
let id_token = &member.id;
match member.r#type {
IceType::Optional(_, tag) => {
quote! {
bytes.extend(OptionalWrapper::new(#tag, self.#id_token.clone()).to_bytes()?);
}
}
_ => {
quote! {
bytes.extend(self.#id_token.to_bytes()?);
}
}
}
}).collect::<Vec<_>>();
let mut member_to_struct = self.members.iter().map(|member| {
let id_token = &member.id;
quote! {
#id_token: #id_token
}
}).collect::<Vec<_>>();
if self.extends.is_some() {
let token = self.extends.as_ref().unwrap().token();
member_tokens.push(quote!{
extends: #token
});
member_to_struct.push(quote!{
extends: #token::from_bytes(&bytes[read as usize..bytes.len()], &mut read)?
});
}
let has_optionals = self.members.iter().any(|member| {
match member.r#type {
IceType::Optional(_, _) => { true },
_ => false
}
});
let optional_tokens = self.members.iter()
.filter_map(|member| {
let id_token = &member.id;
match &member.r#type {
IceType::Optional(option_type, tag) => {
let var_token = option_type.token();
Some(quote! {
#tag => {
#id_token = Some(#var_token::from_bytes(&bytes[read as usize..bytes.len()], &mut read)?);
}
})
},
_ => None
}
}).collect::<Vec<_>>();
let optional_from = if has_optionals {
Some(quote! {
while read < bytes.len() as i32 {
let flag_byte = bytes[read as usize..bytes.len()].first().unwrap();
if *flag_byte == 0xFF {
break;
}
let flag = OptionalFlag::from_bytes(&bytes[read as usize..bytes.len()], &mut read)?;
match flag.tag {
#(#optional_tokens),*
_ => {
if flags.last_slice {
return Err(Box::new(ProtocolError::new("Last slice not expected")));
} else {
read = read - 1;
break;
}
}
}
}
})
} else {
None
};
Ok(quote! {
#[derive(Debug, Clone, PartialEq)]
pub struct #id_token {
#(#member_tokens),*
}
impl ToBytes for #id_token {
fn to_bytes(&self) -> Result<Vec<u8>, Box<dyn std::error::Error + Send + Sync>> {
let mut bytes = Vec::new();
let slice_flags = SliceFlags {
type_id: SliceFlagsTypeEncoding::StringTypeId,
optional_members: #has_optionals,
indirection_table: false,
slice_size: false,
last_slice: true
};
bytes.extend(1u8.to_bytes()?);
bytes.extend(slice_flags.to_bytes()?);
bytes.extend(#type_id_token.to_bytes()?);
#(#member_to_bytes_tokens);*;
bytes.extend(255u8.to_bytes()?);
Ok(bytes)
}
}
impl FromBytes for #id_token {
fn from_bytes(bytes: &[u8], read_bytes: &mut i32) -> Result<Self, Box<dyn std::error::Error + Send + Sync>>
where Self: Sized {
let mut read = 0;
let marker = u8::from_bytes(&bytes[read as usize..bytes.len()], &mut read)?;
if marker != 1 && marker != 255 {
read = 0;
}
let flags = SliceFlags::from_bytes(&bytes[read as usize..bytes.len()], &mut read)?;
match flags.type_id {
SliceFlagsTypeEncoding::StringTypeId => {
let _slice_name = String::from_bytes(&bytes[read as usize..bytes.len()], &mut read)?;
}
SliceFlagsTypeEncoding::CompactTypeId => {
todo!()
}
SliceFlagsTypeEncoding::IndexTypeId => {
todo!()
}
SliceFlagsTypeEncoding::NoTypeId => {}
}
#(#member_from_bytes_tokens);*;
#optional_from
let obj = Self{
#(#member_to_struct),*
};
*read_bytes = *read_bytes + read;
Ok(obj)
}
}
})
}
}