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use std::fmt::Debug;
use crate::serialize::to_base;
const VECTOR_MAX_LENGTH: usize = 5;
const STRING_PRINT_LEN: usize = 128;
pub fn pretty_vec<T: Debug>(buf: &[T]) -> String {
if buf.len() <= VECTOR_MAX_LENGTH {
format!("{:#?}", buf)
} else {
format!(
"({})[{:#?}, {:#?}, … {:#?}, {:#?}]",
buf.len(),
buf[0],
buf[1],
buf[buf.len() - 2],
buf[buf.len() - 1]
)
}
}
pub fn pretty_str(s: &str, print_len: usize) -> String {
if s.len() <= print_len {
format!("`{}`", s)
} else {
format!("({})`{}…`", s.len(), &s.chars().take(print_len).collect::<String>())
}
}
pub fn pretty_hash(s: &str) -> String {
pretty_str(s, STRING_PRINT_LEN)
}
pub fn pretty_utf8(buf: &[u8]) -> String {
match std::str::from_utf8(buf) {
Ok(s) => pretty_hash(s),
Err(_) => {
if buf.len() <= STRING_PRINT_LEN {
pretty_hash(&to_base(buf))
} else {
pretty_vec(buf)
}
}
}
}
pub fn pretty_result(result: &Option<Vec<u8>>) -> String {
match result {
Some(ref v) => pretty_utf8(&v),
None => "None".to_string(),
}
}
pub fn pretty_results(results: &[Option<Vec<u8>>]) -> String {
let v: Vec<String> = results.iter().map(pretty_result).collect();
format!("{:?}", pretty_vec(&v))
}
#[cfg(test)]
mod tests {
use super::*;
static HI_NEAR: &str = "Привет, NEAR";
#[test]
fn test_non_ut8_string_truncation() {
assert_eq!(format!("({})`Привет…`", HI_NEAR.len()), pretty_str(HI_NEAR, 6));
}
#[test]
fn test_non_ut8_more_bytes_same_char_count() {
assert_eq!(
format!("({})`{}…`", HI_NEAR.len(), HI_NEAR),
pretty_str(HI_NEAR, HI_NEAR.chars().count())
);
}
#[test]
fn test_non_ut8_no_truncation() {
assert_eq!(format!("`{}`", HI_NEAR), pretty_str(HI_NEAR, HI_NEAR.len()));
}
}