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use std::{
fmt::{self, Display, Formatter},
ops::{Add, AddAssign, Deref},
};
/// A message string in a gettext translation file.
#[derive(Clone, Debug, Eq, PartialEq)]
pub struct MsgString(String);
impl MsgString {
/// Create a new empty `MsgString`.
///
/// Equivalent to `MsgString::from_escaped("")`.
pub fn empty() -> Self {
MsgString(String::new())
}
/// Create a new `MsgString` from string without any escaped characters.
///
/// This will ensure that the string has common C escape sequences properly created for special
/// characters. It will not attempt to escape non-ASCII characters and will just keep them as
/// UTF-8 characters.
pub fn from_unescaped(string: &str) -> Self {
let string = string.replace('\\', r"\\");
let string = string.replace('\n', r"\n");
let string = string.replace('\r', r"\r");
let string = string.replace('\t', r"\t");
let string = string.replace('"', r#"\""#);
MsgString(string)
}
/// Create a new `MsgString` from string that already has proper escaping.
pub fn from_escaped(string: impl Into<String>) -> Self {
MsgString(string.into())
}
}
impl Display for MsgString {
/// Write the ID message string with proper escaping.
fn fmt(&self, formatter: &mut Formatter<'_>) -> fmt::Result {
self.0.fmt(formatter)
}
}
impl Deref for MsgString {
type Target = str;
fn deref(&self) -> &Self::Target {
self.0.as_str()
}
}
impl AsRef<MsgString> for MsgString {
fn as_ref(&self) -> &Self {
self
}
}
impl<M> AddAssign<M> for MsgString
where
M: AsRef<MsgString>,
{
fn add_assign(&mut self, other: M) {
self.0 += &other.as_ref().0;
}
}
impl<M> Add<M> for MsgString
where
M: AsRef<MsgString>,
{
type Output = MsgString;
fn add(mut self, other: M) -> Self::Output {
self += other;
self
}
}
impl<'r> Add<&'r MsgString> for &MsgString {
type Output = MsgString;
fn add(self, other: &'r MsgString) -> Self::Output {
MsgString(self.0.clone() + &other.0)
}
}
#[cfg(test)]
mod tests {
use super::MsgString;
#[test]
fn empty_constructor() {
let input = MsgString::empty();
assert_eq!(input.to_string(), "");
}
#[test]
fn escaping() {
let input = MsgString::from_unescaped(concat!(
r#""Inside double quotes""#,
r"'Inside single quotes'",
r"Back-slash character: \",
"Whitespace characters: \n\r\t",
));
let expected = concat!(
r#"\"Inside double quotes\""#,
"'Inside single quotes'",
r"Back-slash character: \\",
r"Whitespace characters: \n\r\t",
);
assert_eq!(input.to_string(), expected);
}
#[test]
fn not_escaping() {
let original = r#"\"Inside double quotes\""#;
let input = MsgString::from_escaped(original);
assert_eq!(input.to_string(), original);
}
#[test]
fn appending() {
let mut target = MsgString::from_unescaped(r#""Initial""#);
let extra = MsgString::from_escaped(r#"\"Extra\""#);
target += extra;
let expected = concat!(r#"\"Initial\"#, r#""\"Extra\""#);
assert_eq!(target.to_string(), expected);
}
#[test]
fn concatenating_by_moving() {
let start = MsgString::from_unescaped(r#""Start""#);
let end = MsgString::from_escaped(r#"\"End\""#);
let result = start + end;
let expected = concat!(r#"\"Start\"#, r#""\"End\""#);
assert_eq!(result.to_string(), expected);
}
#[test]
fn concatenating_by_borrowing() {
let start = MsgString::from_escaped(r#"\"Start\""#);
let end = MsgString::from_unescaped(r#""End""#);
let result = &start + &end;
let expected = concat!(r#"\"Start\"#, r#""\"End\""#);
assert_eq!(result.to_string(), expected);
}
}
|
