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|
extern crate netencode;
use netencode::{U, T, Tag};
pub enum Pretty {
Single {
r#type: char,
length: String,
val: String,
trailer: char,
},
Tag {
r#type: char,
length: String,
key: String,
inner: char,
val: Box<Pretty>,
},
Multi {
r#type: char,
length: String,
vals: Vec<Pretty>,
trailer: char
},
}
impl Pretty {
pub fn from_u<'a>(u: U<'a>) -> Pretty {
match u {
U::Unit => Self::scalar('u', "", ""),
U::N1(b) => Self::scalar('n', "1:", if b { "1" } else { "0" }),
U::N3(n) => Self::scalar('n', "3:", n),
U::N6(n) => Self::scalar('n', "6:", n),
U::N7(n) => Self::scalar('n', "7:", n),
U::I3(i) => Self::scalar('i', "3:", i),
U::I6(i) => Self::scalar('i', "6:", i),
U::I7(i) => Self::scalar('i', "7:", i),
U::Text(s) => Pretty::Single {
r#type: 't',
length: format!("{}:", s.len()),
val: s.to_string(),
trailer: ','
},
U::Binary(s) => Pretty::Single {
r#type: 'b',
length: format!("{}:", s.len()),
// For pretty printing we want the string to be visible obviously.
// Instead of not supporting binary, let’s use lossy conversion.
val: String::from_utf8_lossy(s).into_owned(),
trailer: ','
},
U::Sum(Tag{tag, val}) => Self::pretty_tag(tag, Self::from_u(*val)),
U::Record(m) => Pretty::Multi {
r#type: '{',
// TODO: we are losing the size here, should we recompute it? Keep it?
length: String::from(""),
vals: m.into_iter().map(|(k, v)| Self::pretty_tag(k, Self::from_u(v))).collect(),
trailer: '}'
},
U::List(l) => Pretty::Multi {
r#type: '[',
// TODO: we are losing the size here, should we recompute it? Keep it?
length: String::from(""),
vals: l.into_iter().map(|v| Self::from_u(v)).collect(),
trailer: ']',
},
}
}
fn scalar<D>(r#type: char, length: &str, d: D) -> Pretty
where D: std::fmt::Display
{
Pretty::Single {
r#type,
length: length.to_string(),
val: format!("{}", d),
trailer: ','
}
}
fn pretty_tag(tag: &str, val: Pretty) -> Pretty {
Pretty::Tag {
r#type: '<',
length: format!("{}:", tag.len()),
key: tag.to_string(),
inner: '|',
val: Box::new(val),
}
}
pub fn print_multiline<W>(&self, mut w: &mut W) -> std::io::Result<()>
where W: std::io::Write
{
Self::go(&mut w, self, 0, true);
write!(w, "\n")
}
fn go<W>(mut w: &mut W, p: &Pretty, depth: usize, is_newline: bool) -> std::io::Result<()>
where W: std::io::Write
{
const full : usize = 4;
const half : usize = 2;
let i = &vec![b' '; depth*full];
let iandhalf = &vec![b' '; depth*full + half];
let (i, iandhalf) = unsafe {(
std::str::from_utf8_unchecked(i),
std::str::from_utf8_unchecked(iandhalf),
)};
if is_newline {
write!(&mut w, "{}", i);
}
match p {
Pretty::Single {r#type, length, val, trailer} =>
write!(&mut w, "{} {}{}", r#type, val, trailer),
Pretty::Tag { r#type, length, key, inner, val } => {
write!(&mut w, "{} {} {}", r#type, key, inner)?;
Self::go::<W>(&mut w, val, depth, false)
},
// if the length is 0 or 1, we print on one line,
// only if there’s more than one element we split the resulting value.
// we never break lines on arbitrary column sizes, since that is just silly.
Pretty::Multi {r#type, length, vals, trailer} => match vals.len() {
0 => write!(&mut w, "{} {}", r#type, trailer),
1 => {
write!(&mut w, "{} ", r#type);
Self::go::<W>(&mut w, &vals[0], depth, false)?;
write!(&mut w, "{}", trailer)
},
more => {
write!(&mut w, "\n{}{} \n", iandhalf, r#type)?;
for v in vals {
Self::go::<W>(&mut w, v, depth + 1, true)?;
write!(&mut w, "\n")?;
}
write!(&mut w, "{}{}", iandhalf, trailer)
}
},
}
}
}
|
