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use std::{
borrow::Cow,
fmt::{Debug, Display, Write},
sync::Arc,
};
use serde::{Deserialize, Serialize};
/// A schema name. Cloning is inexpensive.
#[derive(Hash, PartialEq, Eq, Deserialize, Serialize, Debug, Clone, Ord, PartialOrd)]
#[serde(try_from = "String")]
#[serde(into = "String")]
pub struct Name {
name: Arc<Cow<'static, str>>,
needs_escaping: bool,
}
/// A name was unable to e parsed.
#[derive(thiserror::Error, Debug, Serialize, Deserialize, Clone)]
#[error("invalid name: {0}")]
pub struct InvalidNameError(pub String);
impl Name {
/// Creates a new name.
pub fn new<T: Into<Self>>(contents: T) -> Self {
contents.into()
/// Parses a name that was previously encoded via [`Self::encoded()`].
///
/// # Errors
/// Returns [`InvalidNameError`] if the name contains invalid escape
/// sequences.
pub fn parse_encoded(encoded: &str) -> Result<Self, InvalidNameError> {
let mut bytes = encoded.bytes();
let mut decoded = Vec::with_capacity(encoded.len());
while let Some(byte) = bytes.next() {
if byte == b'_' {
if let (Some(high), Some(low)) = (bytes.next(), bytes.next()) {
if let Some(byte) = hex_chars_to_byte(high, low) {
decoded.push(byte);
continue;
return Err(InvalidNameError(encoded.to_string()));
String::from_utf8(decoded)
.map(Self::from)
.map_err(|_| InvalidNameError(encoded.to_string()))
/// Returns an encoded version of this name that contains only alphanumeric
/// ASCII, underscore, and hyphen.
#[must_use]
pub fn encoded(&self) -> String {
format!("{:#}", self)
impl From<Cow<'static, str>> for Name {
fn from(value: Cow<'static, str>) -> Self {
let needs_escaping = !value
.bytes()
.all(|b| b.is_ascii_alphanumeric() || b == b'-');
Self {
name: Arc::new(value),
needs_escaping,
impl From<&'static str> for Name {
fn from(value: &'static str) -> Self {
Self::from(Cow::Borrowed(value))
impl From<String> for Name {
fn from(value: String) -> Self {
Self::from(Cow::Owned(value))
#[allow(clippy::from_over_into)] // the auto into impl doesn't work with serde(into)
impl Into<String> for Name {
fn into(self) -> String {
self.name.to_string()
impl Display for Name {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
if f.alternate() && self.needs_escaping {
for byte in self.name.bytes() {
if byte.is_ascii_alphanumeric() || byte == b'-' {
f.write_char(byte as char)?;
} else {
// Encode the byte as _FF
f.write_char('_')?;
f.write_char(nibble_to_hex_char(byte >> 4))?;
f.write_char(nibble_to_hex_char(byte & 0xF))?;
Ok(())
Display::fmt(&self.name, f)
const fn nibble_to_hex_char(nibble: u8) -> char {
let ch = match nibble {
0..=9 => b'0' + nibble,
_ => b'a' + nibble - 10,
ch as char
const fn hex_chars_to_byte(high_nibble: u8, low_nibble: u8) -> Option<u8> {
match (
hex_char_to_nibble(high_nibble),
hex_char_to_nibble(low_nibble),
) {
(Some(high_nibble), Some(low_nibble)) => Some(high_nibble << 4 | low_nibble),
_ => None,
const fn hex_char_to_nibble(nibble: u8) -> Option<u8> {
b'0'..=b'9' => nibble - b'0',
b'a'..=b'f' => nibble - b'a' + 10,
_ => return None,
Some(ch)
impl AsRef<str> for Name {
fn as_ref(&self) -> &str {
self.name.as_ref()
/// The owner of a schema item. This should represent the company, group, or
/// individual that created the item in question. This value is used for
/// namespacing. Changing this after values are in use is not supported without
/// manual migrations at this time.
#[serde(transparent)]
pub struct Authority(Name);
impl From<Cow<'static, str>> for Authority {
Self::from(Name::from(value))
impl From<&'static str> for Authority {
impl From<String> for Authority {
impl From<Name> for Authority {
fn from(value: Name) -> Self {
Self(value)
impl Display for Authority {
Display::fmt(&self.0, f)
/// The name of a [`Schema`](super::Schema).
pub struct SchemaName {
/// The authority of this schema.
pub authority: Authority,
/// The name of this schema.
pub name: Name,
impl SchemaName {
/// Creates a name for a [`Schema`](super::Schema) that is not meant
/// to be shared with other developers.
pub fn private<N: Into<Name>>(name: N) -> Self {
let authority = Authority::from("private");
let name = name.into();
Self { authority, name }
/// Creates a new schema name.
pub fn new<A: Into<Authority>, N: Into<Name>>(authority: A, name: N) -> Self {
let authority = authority.into();
/// Parses a schema name that was previously encoded via
/// [`Self::encoded()`].
/// sequences or contains more than two periods.
pub fn parse_encoded(schema_name: &str) -> Result<Self, InvalidNameError> {
let mut parts = schema_name.split('.');
if let (Some(authority), Some(name), None) = (parts.next(), parts.next(), parts.next()) {
let authority = Name::parse_encoded(authority)?;
let name = Name::parse_encoded(name)?;
Ok(Self::new(authority, name))
Err(InvalidNameError(schema_name.to_string()))
/// Encodes this schema name such that the authority and name can be
/// safely parsed using [`Self::parse_encoded`].
impl Display for SchemaName {
Display::fmt(&self.authority, f)?;
f.write_char('.')?;
/// The namespaced name of a [`Collection`](super::Collection).
#[derive(Hash, PartialEq, Eq, Deserialize, Serialize, Debug, Clone)]
pub struct CollectionName {
/// The authority of this collection. This name is used to ensure
/// collections from multiple authors/authorities can be used in the same
/// schema.
/// The name of this collection. Must be unique within the [`Schema`](super::Schema)
impl CollectionName {
/// Creates a name for a [`Collection`](super::Collection) that is not meant
/// Creates a new collection name.
/// Parses a colleciton name that was previously encoded via
pub fn parse_encoded(collection_name: &str) -> Result<Self, InvalidNameError> {
let mut parts = collection_name.split('.');
Err(InvalidNameError(collection_name.to_string()))
/// Encodes this collection name such that the authority and name can be
impl Display for CollectionName {
/// The name of a [`View`](super::View).
pub struct ViewName {
/// The name of the collection that contains this view.
pub collection: CollectionName,
/// The name of this view.
impl ViewName {
/// Creates a new view name.
pub fn new<
C: TryInto<CollectionName, Error = InvalidNameError>,
N: TryInto<Name, Error = InvalidNameError>,
>(
collection: C,
name: N,
) -> Result<Self, InvalidNameError> {
let collection = collection.try_into()?;
let name = name.try_into()?;
Ok(Self { collection, name })
impl Display for ViewName {
Display::fmt(&self.collection, f)?;
#[test]
fn name_escaping_tests() {
const VALID_CHARS: &str = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-";
const INVALID_CHARS: &str = "._hello\u{1F680}";
const ESCAPED_INVALID: &str = "_2e_5fhello_f0_9f_9a_80";
assert_eq!(Name::new(VALID_CHARS).to_string(), VALID_CHARS);
assert_eq!(Name::new(INVALID_CHARS).to_string(), INVALID_CHARS);
assert_eq!(Name::new(INVALID_CHARS).encoded(), ESCAPED_INVALID);
assert_eq!(
Name::parse_encoded(ESCAPED_INVALID).unwrap(),
Name::new(INVALID_CHARS)
);
Name::parse_encoded("_").unwrap_err();
Name::parse_encoded("_0").unwrap_err();
Name::parse_encoded("_z").unwrap_err();
Name::parse_encoded("_0z").unwrap_err();
fn joined_names_tests() {
const INVALID_CHARS: &str = "._hello\u{1F680}.._world\u{1F680}";
const ESCAPED_INVALID: &str = "_2e_5fhello_f0_9f_9a_80._2e_5fworld_f0_9f_9a_80";
let collection = CollectionName::parse_encoded(ESCAPED_INVALID).unwrap();
assert_eq!(collection.to_string(), INVALID_CHARS);
assert_eq!(collection.encoded(), ESCAPED_INVALID);
let schema_name = SchemaName::parse_encoded(ESCAPED_INVALID).unwrap();
assert_eq!(schema_name.to_string(), INVALID_CHARS);
assert_eq!(schema_name.encoded(), ESCAPED_INVALID);