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use crate::{utils::SYSTEM_SYMBOLS, WolframValue};
use flate2::{write::ZlibEncoder, Compression};
use std::{collections::BTreeSet, io::Write, mem::transmute};
impl WolframValue {
pub fn to_string(&self) -> String {
format!("{}", self)
}
pub fn to_bytes(&self) -> Vec<u8> {
let mut out = Vec::new();
out.extend_from_slice(b"8:");
out.extend_from_slice(&self.to_bytes_inner());
return out;
}
pub fn to_compressed(&self) -> Vec<u8> {
let mut out = Vec::new();
let mut e = ZlibEncoder::new(vec![], Compression::new(9));
if let Ok(_) = e.write_all(&self.to_bytes_inner()) {
out.extend_from_slice(b"8C:")
};
if let Ok(o) = e.finish() {
out.extend_from_slice(&o)
};
return out;
}
fn to_bytes_inner(&self) -> Vec<u8> {
match self {
WolframValue::Skip => vec![],
WolframValue::Function(head, args) => {
let mut out = Vec::new();
out.push(b'f');
out.extend_from_slice(&length_encoding(args.len()));
out.extend_from_slice(&head.to_bytes_inner());
for v in args {
out.extend_from_slice(&v.to_bytes_inner())
}
return out;
}
WolframValue::String(s) => {
let ref len = length_encoding(s.len());
let mut out = Vec::with_capacity(1 + len.len() + s.len());
out.push(b'S');
out.extend_from_slice(len);
out.extend_from_slice(s.as_bytes());
return out;
}
WolframValue::Bytes(v) => {
let ref len = length_encoding(v.len());
let mut out = Vec::with_capacity(1 + len.len() + v.len());
out.push(b'B');
out.extend_from_slice(len);
out.extend_from_slice(&v);
return out;
}
WolframValue::Symbol(symbol) => {
let s = standardized_symbol_name(symbol);
let ref len = length_encoding(symbol.len());
let mut out = Vec::with_capacity(1 + len.len() + s.len());
out.push(b's');
out.extend_from_slice(len);
out.extend_from_slice(s.as_bytes());
return out;
}
WolframValue::Integer8(n) => {
let le: [u8; 1] = unsafe { transmute(n.to_le()) };
let mut v = Vec::with_capacity(2);
v.push(b'C');
v.extend_from_slice(le.as_ref());
return v;
}
WolframValue::Integer16(n) => {
let le: [u8; 2] = unsafe { transmute(n.to_le()) };
let mut v = Vec::with_capacity(3);
v.push(b'j');
v.extend_from_slice(le.as_ref());
return v;
}
WolframValue::Integer32(n) => {
let le: [u8; 4] = unsafe { transmute(n.to_le()) };
let mut v = Vec::with_capacity(5);
v.push(b'i');
v.extend_from_slice(le.as_ref());
return v;
}
WolframValue::Integer64(n) => {
let le: [u8; 8] = unsafe { transmute(n.to_le()) };
let mut v = Vec::with_capacity(9);
v.push(b'L');
v.extend_from_slice(le.as_ref());
return v;
}
WolframValue::BigInteger(i) => {
let n = i.to_str_radix(10);
let ref len = length_encoding(n.len());
let mut v = Vec::with_capacity(1 + len.len() + n.len());
v.push(b'I');
v.extend_from_slice(len);
v.extend_from_slice(n.as_bytes());
return v;
}
WolframValue::Decimal64(s) => {
let mut v = Vec::with_capacity(9);
v.push(b'r');
v.extend_from_slice(s);
return v;
}
WolframValue::BigDecimal(_) => unimplemented!(),
WolframValue::PackedArray(_) => unimplemented!(),
WolframValue::NumericArray(_) => unimplemented!(),
WolframValue::Association(dict) => {
let mut out = Vec::with_capacity(dict.len());
out.push(b'A');
out.extend_from_slice(&length_encoding(dict.len()));
for (k, (r, v)) in dict {
out.extend_from_slice(&r.to_bytes_inner());
out.extend_from_slice(&k.to_bytes_inner());
out.extend_from_slice(&v.to_bytes_inner());
}
return out;
}
WolframValue::Rule => vec![b'-'],
WolframValue::RuleDelayed => vec![b':'],
}
}
}
fn standardized_symbol_name(input: &str) -> String {
if input.contains('`') {
return format!("{}", input);
}
let mut set = BTreeSet::new();
for sys in SYSTEM_SYMBOLS.iter() {
set.insert(*sys);
}
if set.contains(input) { format!("{}", input) } else { format!("Global`{}", input) }
}
fn length_encoding(len: usize) -> Vec<u8> {
let mut buf = vec![];
let mut varint = len;
loop {
let next = varint & 0x7F;
varint >>= 7;
if varint != 0 {
buf.push((next | 0x80) as u8)
}
else {
buf.push(next as u8);
break
}
}
return buf.to_vec()
}