wasper 0.1.3

A Webassembly interpreter written in Rust without standard library
Documentation 
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#[cfg(not(feature = "std"))]
use crate::lib::*;
pub trait FromByte: Sized {
    fn from_byte(b: u8) -> Option<Self>;
}

#[derive(Debug, PartialEq, Eq, Clone)]
pub enum RefType {
    FuncRef,
    ExternRef,
}

impl FromByte for RefType {
    fn from_byte(b: u8) -> Option<Self> {
        match b {
            0x70 => Some(RefType::FuncRef),
            0x6F => Some(RefType::ExternRef),
            _ => None,
        }
    }
}

#[derive(Debug, PartialEq, Eq, Clone, Copy)]
pub enum ValType {
    I32,
    I64,
    F32,
    F64,
    FuncRef,
    ExternRef,
}

impl FromByte for ValType {
    fn from_byte(n: u8) -> Option<Self> {
        match n {
            // Number Type
            0x7F => Some(ValType::I32),
            0x7E => Some(ValType::I64),
            0x7D => Some(ValType::F32),
            0x7c => Some(ValType::F64),
            // Vector Type
            0x70 => Some(ValType::FuncRef),
            // Reference Type
            0x6F => Some(ValType::ExternRef),
            _ => None,
        }
    }
}

#[derive(Debug, PartialEq, Eq, Clone)]
pub struct FuncType(pub ResultType, pub ResultType);

#[derive(Debug, PartialEq, Eq, Clone)]
pub struct ResultType(pub Vec<ValType>);

#[derive(Debug, PartialEq, Eq, Clone)]
pub enum Limits {
    Min(u32),
    MinMax(u32, u32),
}

impl Limits {
    pub fn set_min(&self, min: u32) -> Self {
        match self {
            Limits::Min(_) => Limits::Min(min),
            Limits::MinMax(_, m) => Limits::MinMax(min, *m),
        }
    }
    pub fn min(&self) -> u32 {
        match self {
            Limits::Min(v) => *v,
            Limits::MinMax(v, _) => *v,
        }
    }

    pub fn max(&self) -> Option<u32> {
        match self {
            Limits::Min(_) => None,
            Limits::MinMax(_, v) => Some(*v),
        }
    }

    pub fn valid(&self) -> bool {
        match self {
            Limits::Min(_) => true,
            Limits::MinMax(n, m) => n <= m,
        }
    }
}

#[derive(Debug, PartialEq, Eq, Clone)]
pub enum Mut {
    Const,
    Var,
}

#[derive(Debug, PartialEq, Eq, Clone)]
pub struct GlobalType {
    pub valtype: ValType,
    pub mut_: Mut,
}