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use crate::error::{Error, ErrorKind, Result};
use error_chain::bail;
use lazy_static::lazy_static;
use regex::Regex;
use std::convert::TryFrom;
use std::fmt::{Display, Formatter};
use std::hash::Hash;
#[derive(Clone, Debug, Hash, PartialEq, Eq)]
pub struct MessagePath {
pub package: String,
pub name: String,
}
impl MessagePath {
pub fn new(package: impl Into<String>, name: impl Into<String>) -> Self {
Self {
package: package.into(),
name: name.into(),
}
}
fn from_combined(input: &str) -> Result<Self> {
let mut parts = input.splitn(2, '/');
let package = match parts.next() {
Some(v) => v,
None => bail!("Package string constains no parts: {}", input),
};
let name = match parts.next() {
Some(v) => v,
None => bail!(
"Package string needs to be in package/name format: {}",
input
),
};
let output = Self::new(package, name);
output.validate()?;
Ok(output)
}
fn has_valid_package_name(&self) -> bool {
RE_PACKAGE_CORRECT_CHAR_SET_AND_LENGTH.is_match(&self.package)
&& !RE_PACKAGE_CONSECUTIVE_UNDERSCORE.is_match(&self.package)
}
pub fn validate(&self) -> Result<()> {
if !self.has_valid_package_name() {
bail!(ErrorKind::PackageNameInvalid(self.package.clone()));
}
Ok(())
}
}
impl Display for MessagePath {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
write!(f, "{}/{}", self.package, self.name)
}
}
impl<'a> TryFrom<&'a str> for MessagePath {
type Error = Error;
fn try_from(value: &'a str) -> Result<Self> {
Self::from_combined(value)
}
}
lazy_static! {
static ref RE_PACKAGE_CORRECT_CHAR_SET_AND_LENGTH: Regex =
Regex::new("^[a-z][a-z0-9_]+$").unwrap();
static ref RE_PACKAGE_CONSECUTIVE_UNDERSCORE: Regex = Regex::new("__").unwrap();
}
#[cfg(test)]
mod tests {
use super::*;
fn is_valid_package_name(package: &str) -> bool {
MessagePath::new(package, "anything").has_valid_package_name()
}
#[test]
fn package_names_must_be_at_least_two_characters() {
assert!(is_valid_package_name("foo"));
assert!(is_valid_package_name("fo"));
assert!(!is_valid_package_name("f"));
}
#[test]
fn package_names_must_start_with_lowercase_alphabetic() {
assert!(is_valid_package_name("foo_123"));
assert!(!is_valid_package_name("Foo_123"));
assert!(!is_valid_package_name("1oo_123"));
assert!(!is_valid_package_name("_oo_123"));
}
#[test]
fn package_names_must_not_contain_uppercase_anywhere() {
assert!(is_valid_package_name("foo_123"));
assert!(!is_valid_package_name("foO_123"));
}
#[test]
fn package_names_are_limited_to_lowercase_alphanumeric_and_underscore() {
assert!(is_valid_package_name("foo_123"));
assert!(!is_valid_package_name("foO_123"));
assert!(!is_valid_package_name("foo-123"));
}
#[test]
fn package_names_must_not_contain_multiple_underscores_in_a_row() {
assert!(is_valid_package_name("foo_123_"));
assert!(is_valid_package_name("f_o_o_1_2_3_"));
assert!(!is_valid_package_name("foo__123_"));
assert!(!is_valid_package_name("foo___123_"));
}
}