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use std::collections::HashMap;
use std::vec::Vec;
use std::io::{Write,Read};
use std::num::FpCategory;
pub enum Value {
Integer(i64),
ByteString(Vec<u8>),
Boolean(bool),
List(Vec<Value>),
Dictionary(HashMap<String, Value>),
Float(f64),
Nothing,
}
// const FLOAT_DIVISOR: f64 = (256_f64).ln();
fn write_packed_int( x: i64 ) -> Vec<u8>
{
let mut w = Vec::<u8>::with_capacity(10);
let mut v = x;
let mut bb = if x < 0 {
v = -v;
0x40_u8
} else {
0x00_u8
} | if v > (v & 0x3F) { 0x80_u8 } else { 0x00_u8 };
w.push(bb);
v = v >> 6;
while v > 0 {
bb = (v & 0x7F) as u8 | if v > (v & 0x7F) { 0x80_u8 } else { 0x00_u8 };
w.push(bb);
v = v >> 7;
}
w
}
fn read_packed_int<R: Read>( r: &mut R ) -> Result<i64, std::io::Error> {
let mut out : i64;
let mut bb = [0u8];
r.read( &mut bb )?;
let negative = (bb[0]&0x40_u8) == 0x40_u8;
out = (bb[0]&0x3F_u8) as i64;
let mut c = 0;
while (bb[0]&0x80_u8) != 0 {
r.read( &mut bb )?;
out |= ((bb[0]&0x7F_u8) as i64) << (6+7*c);
c += 1;
}
if negative {
Ok(-out)
} else {
Ok(out)
}
}
impl Value {
pub fn write<W: Write>(&self, w: &mut W) -> Result<(), std::io::Error> {
match self {
Self::Integer(x) => {
let mut bb = [0u8];
bb[0] = 'i' as u8;
w.write_all(&bb)?;
w.write_all(&write_packed_int( *x ))?;
},
Self::ByteString(s) => {
let mut bb = [0u8];
bb[0] = 's' as u8;
w.write_all(&bb)?;
w.write_all(&write_packed_int( s.len() as i64 ))?;
w.write_all( &s )?;
},
Self::Boolean(b) => {
let mut bb = [0u8];
bb[0] = if *b { '1' } else { '0' } as u8;
w.write_all( &bb )?;
},
Self::List(l) => {
},
Self::Dictionary(d) => {
},
Self::Float(f) => {
let mut bb = ['F' as u8, 0u8];
match f.classify() {
FpCategory::Nan => {
bb[1] = if f.is_sign_negative() { 'N' } else { 'n' } as u8;
w.write_all( &bb )?;
},
FpCategory::Infinite => {
bb[1] = if f.is_sign_negative() { 'I' } else { 'i' } as u8;
w.write_all( &bb )?;
},
FpCategory::Zero => {
bb[1] = if f.is_sign_negative() { 'Z' } else { 'z' } as u8;
w.write_all( &bb )?;
},
FpCategory::Subnormal => {
// The format doesn't account for these...uh...make them zero?
bb[1] = if f.is_sign_negative() { 'Z' } else { 'z' } as u8;
w.write_all( &bb )?;
},
FpCategory::Normal => {
let div = 256f64.ln();
todo!();
},
}
},
Self::Nothing => {
},
}
Ok(())
}
}
pub fn add(left: u64, right: u64) -> u64 {
left + right
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn it_works() {
let result = add(2, 2);
assert_eq!(result, 4);
}
}
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