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extern crate netencode;
use netencode::{Tag, T, U};
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,
},
// Multi-line content (for long text or binary hexdumps)
MultiLine {
r#type: char,
length_info: String, // e.g., "[127]" for truncated content
lines: Vec<String>,
trailer: char,
},
}
impl Pretty {
const TEXT_THRESHOLD: usize = 40;
const BINARY_SINGLE_LINE_THRESHOLD: usize = 16;
const HEXDUMP_MAX_ROWS: usize = 6;
fn format_text(s: &str) -> Pretty {
if s.len() <= Self::TEXT_THRESHOLD {
// Short text - show complete
Pretty::Single {
r#type: 't',
length: String::new(),
val: s.to_string(),
trailer: ',',
}
} else {
// Long text - truncate with length indicator
let truncated = format!("{}...", &s[..Self::TEXT_THRESHOLD]);
Pretty::Single {
r#type: 't',
length: format!("{}", s.len()),
val: truncated,
trailer: ',',
}
}
}
fn format_binary(data: &[u8]) -> Pretty {
// Check if it's valid UTF-8
if let Ok(utf8_str) = std::str::from_utf8(data) {
// Still binary format (b prefix) but display as text content
if utf8_str.len() <= Self::TEXT_THRESHOLD {
Pretty::Single {
r#type: 'b',
length: format!("{}", data.len()),
val: utf8_str.to_string(),
trailer: ',',
}
} else {
// Long UTF-8 binary - truncate with length indicator
let truncated = format!("{}...", &utf8_str[..Self::TEXT_THRESHOLD]);
Pretty::Single {
r#type: 'b',
length: format!("{}", data.len()),
val: truncated,
trailer: ',',
}
}
} else if data.len() <= Self::BINARY_SINGLE_LINE_THRESHOLD {
// Short binary - single line hex
let hex = data.iter()
.map(|b| format!("{:02x}", b))
.collect::<Vec<_>>()
.join("");
Pretty::Single {
r#type: 'b',
length: format!("{}", data.len()),
val: hex,
trailer: ',',
}
} else {
// Long binary - multi-line hexdump
let lines = Self::format_hexdump(data);
Pretty::MultiLine {
r#type: 'b',
length_info: format!("{}", data.len()),
lines,
trailer: ',',
}
}
}
fn format_hexdump(data: &[u8]) -> Vec<String> {
let mut lines = Vec::new();
let rows_to_show = std::cmp::min(Self::HEXDUMP_MAX_ROWS, (data.len() + 15) / 16);
for row in 0..rows_to_show {
let offset = row * 16;
let row_data = &data[offset..std::cmp::min(offset + 16, data.len())];
let mut line = String::new();
// Offset column
line.push_str(&format!("{:08x} ", offset));
// Hex columns (8 + space + 8)
for (i, byte) in row_data.iter().enumerate() {
if i == 8 { line.push(' '); }
line.push_str(&format!("{:02x} ", byte));
}
// Pad if last row is short
let padding = (16 - row_data.len()) * 3 + if row_data.len() <= 8 { 1 } else { 0 };
line.push_str(&" ".repeat(padding));
// ASCII column
line.push_str(" |");
for byte in row_data {
let c = if byte.is_ascii_graphic() || *byte == b' ' {
*byte as char
} else {
'.'
};
line.push(c);
}
line.push('|');
lines.push(line);
}
// Show truncation if needed
if data.len() > rows_to_show * 16 {
lines.push(format!("... ({} more bytes)", data.len() - rows_to_show * 16));
}
lines
}
pub fn from_u<'a>(u: U<'a>) -> Pretty {
match u {
U::Unit => Self::scalar('u', ""),
U::N(n) => Self::scalar('n', n),
U::I(i) => Self::scalar('i', i),
U::Text(s) => Self::format_text(s),
U::Bytes(s) => Self::format_binary(s),
U::Tag(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, d: D) -> Pretty
where
D: std::fmt::Display,
{
Pretty::Single {
r#type,
length: String::new(),
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,
} => {
if length.is_empty() {
write!(&mut w, "{} {}{}", r#type, val, trailer)
} else {
write!(&mut w, "{}{} {}{}", r#type, length, 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", r#type)?;
for v in vals {
Self::go::<W>(&mut w, v, depth + 1, true)?;
write!(&mut w, "\n")?;
}
write!(&mut w, "{}{}", iandhalf, trailer)
}
},
// Handle multi-line content (hexdumps)
Pretty::MultiLine {
r#type,
length_info,
lines,
trailer,
} => {
write!(&mut w, "{}{}\n", r#type, length_info)?;
for line in lines {
write!(&mut w, "{}{}\n", i, line)?;
}
write!(&mut w, "{}", i)?; // Indent for trailer
Ok(())
}
}
}
}
|