use std::collections::BTreeMap;use std::fmt::Write as _;use std::time::{SystemTime, UNIX_EPOCH}; pub(crate) fn frozen_time_ms() -> u128 { SystemTime::now() .duration_since(UNIX_EPOCH) .expect("system clock before unix epoch") .as_millis()} pub(crate) fn stable_hash64(bytes: &[u8]) -> u64 { let mut hash = 0xcbf29ce484222325_u64; for byte in bytes { hash ^= u64::from(*byte); hash = hash.wrapping_mul(0x100000001b3); } hash} pub(crate) fn encode_json_string_array(values: &[String]) -> String { let mut json = String::from("["); for (index, value) in values.iter().enumerate() { if index > 0 { json.push(','); } json.push_str(&encode_json_string(value)); } json.push(']'); json} pub(crate) fn encode_json_string_map(values: &BTreeMap<String, String>) -> String { let mut json = String::from("{"); for (index, (key, value)) in values.iter().enumerate() { if index > 0 { json.push(','); } json.push_str(&encode_json_string(key)); json.push(':'); json.push_str(&encode_json_string(value)); } json.push('}'); json} pub(crate) fn encode_json_string(value: &str) -> String { let mut json = String::with_capacity(value.len() + 2); json.push('"'); for ch in value.chars() { match ch { '"' => json.push_str("\\\""), '\\' => json.push_str("\\\\"), '\n' => json.push_str("\\n"), '\r' => json.push_str("\\r"), '\t' => json.push_str("\\t"), '\u{08}' => json.push_str("\\b"), '\u{0C}' => json.push_str("\\f"), ch if ch.is_control() || u32::from(ch) > 0xFFFF => { push_utf16_escape(&mut json, ch); } ch => json.push(ch), } } json.push('"'); json} fn push_utf16_escape(json: &mut String, ch: char) { let mut units = [0_u16; 2]; for unit in ch.encode_utf16(&mut units).iter() { let _ = write!(json, "\\u{:04x}", unit); }} #[cfg(test)]mod tests { use super::encode_json_string; #[test] fn encode_json_string_escapes_non_bmp_as_surrogate_pairs() { assert_eq!(encode_json_string("emoji: 😀"), r#""emoji: \ud83d\ude00""#); }}
use std::collections::BTreeMap;
use std::fmt::Write as _;
use std::time::{SystemTime, UNIX_EPOCH};
pub(crate) fn frozen_time_ms() -> u128 {
SystemTime::now()
.duration_since(UNIX_EPOCH)
.expect("system clock before unix epoch")
.as_millis()
}
pub(crate) fn stable_hash64(bytes: &[u8]) -> u64 {
let mut hash = 0xcbf29ce484222325_u64;
for byte in bytes {
hash ^= u64::from(*byte);
hash = hash.wrapping_mul(0x100000001b3);
}
hash
}
pub(crate) fn encode_json_string_array(values: &[String]) -> String {
let mut json = String::from("[");
for (index, value) in values.iter().enumerate() {
if index > 0 {
json.push(',');
}
json.push_str(&encode_json_string(value));
}
json.push(']');
json
}
pub(crate) fn encode_json_string_map(values: &BTreeMap<String, String>) -> String {
let mut json = String::from("{");
for (index, (key, value)) in values.iter().enumerate() {
if index > 0 {
json.push(',');
}
json.push_str(&encode_json_string(key));
json.push(':');
json.push_str(&encode_json_string(value));
}
json.push('}');
json
}
pub(crate) fn encode_json_string(value: &str) -> String {
let mut json = String::with_capacity(value.len() + 2);
json.push('"');
for ch in value.chars() {
match ch {
'"' => json.push_str("\\\""),
'\\' => json.push_str("\\\\"),
'\n' => json.push_str("\\n"),
'\r' => json.push_str("\\r"),
'\t' => json.push_str("\\t"),
'\u{08}' => json.push_str("\\b"),
'\u{0C}' => json.push_str("\\f"),
ch if ch.is_control() || u32::from(ch) > 0xFFFF => {
push_utf16_escape(&mut json, ch);
}
ch => json.push(ch),
}
}
json.push('"');
json
}
fn push_utf16_escape(json: &mut String, ch: char) {
let mut units = [0_u16; 2];
for unit in ch.encode_utf16(&mut units).iter() {
let _ = write!(json, "\\u{:04x}", unit);
}
}
#[cfg(test)]
mod tests {
use super::encode_json_string;
#[test]
fn encode_json_string_escapes_non_bmp_as_surrogate_pairs() {
assert_eq!(encode_json_string("emoji: 😀"), r#""emoji: \ud83d\ude00""#);
}
}