tycho 0.1.2

A minimal, self-describing and traversable binary data format designed around rust and the serde data model.
Documentation 
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use std::io::{Read, Seek};

use crate::error::TychoResult;
use crate::partial::reader::PartialReader;
use crate::partial::types::{PartialStruct, PartialList, PartialMap, PartialArray, PartialCompression};
use crate::read::element::read_element_ident;
use crate::read::length::read_length;
use crate::read::string::read_tstring;
use crate::read::value::{read_value, read_value_ident};
use crate::types::ident::{ElementIdent, ValueIdent};
use crate::Value;

#[derive(Debug, Clone)]
/// A partial, unread, element with a pointer.
pub enum PartialElement {
    Unit,
    Value(Value),
    Option(Option<Box<PartialElement>>),
    Variant(String, Box<PartialElement>),
    Struct(PartialStruct),
    List(PartialList),
    Map(PartialMap),
    Array(PartialArray),
    Compression(PartialCompression),
}

pub fn read_partial_element<R: Read + Seek>(reader: &mut PartialReader<R>) -> TychoResult<PartialElement> {
    let ident = read_element_ident(reader)?;

    match ident {
        ElementIdent::Unit => Ok(PartialElement::Unit),
        ElementIdent::Value => {
            let prefix = read_value_ident(reader)?;
            let value = read_value(reader, &prefix)?;
            Ok(PartialElement::Value(value))
        },

        ElementIdent::None => Ok(PartialElement::Option(None)),
        ElementIdent::Some => read_partial_element(reader),

        ElementIdent::Variant => {
            let name = read_tstring(reader)?;
            let value =read_partial_element(reader)?;

            Ok(PartialElement::Variant(name, Box::new(value)))
        }

        ElementIdent::Struct => {
            let size = read_length(reader)? as u64;
            let pos = reader.pointer.clone();
            reader.jump(&size)?;
            Ok(PartialElement::Struct(PartialStruct::new(reader.pointer(pos, size), 0, ())))
        },

        ElementIdent::List => {
            let size = read_length(reader)? as u64;
            let pos = reader.pointer.clone();
            reader.jump(&size)?;
            Ok(PartialElement::List(PartialList::new(reader.pointer(pos, size), 0, ())))
        },

        ElementIdent::Array => {
            let array_type = read_value_ident(reader)?;

            if array_type == ValueIdent::Null {
                return Ok(PartialElement::Array(PartialArray::empty(reader.empty_pointer(),array_type)))
            }

            let size = read_length(reader)? as u64;
            let pos = reader.pointer.clone();
            reader.jump(&size)?;
            Ok(PartialElement::Array(PartialArray::new(reader.pointer(pos, size), 0, array_type)))
        },

        ElementIdent::Map => {
            let key_type = read_value_ident(reader)?;

            if key_type == ValueIdent::Null {
                return Ok(PartialElement::Map(PartialMap::empty(reader.empty_pointer(), key_type)))
            }

            let size = read_length(reader)? as u64;
            let pos = reader.pointer.clone();
            reader.jump(&size)?;
            Ok(PartialElement::Map(PartialMap::new(reader.pointer(pos, size), 0, key_type)))
        },

        ElementIdent::Compression => {
            let size = read_length(reader)? as u64;
            let pos = reader.pointer.clone();
            reader.jump(&size)?;
            Ok(PartialElement::Compression(PartialCompression::new(reader.pointer(pos, size))))
        }
    }
}