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use std::convert::TryFrom;
use std::fmt::{self, Debug, Display, Formatter, Write};
use std::ops::{Add, AddAssign, Deref};
use crate::diag::StrResult;
use crate::util::EcoString;
/// A string value with inline storage and clone-on-write semantics.
#[derive(Default, Clone, Eq, PartialEq, Ord, PartialOrd)]
pub struct Str(EcoString);
impl Str {
/// Create a new, empty string.
pub fn new() -> Self {
Self::default()
}
/// Whether the string is empty.
pub fn is_empty(&self) -> bool {
self.0.is_empty()
}
/// The length of the string in bytes.
pub fn len(&self) -> i64 {
self.0.len() as i64
}
/// Borrow this as a string slice.
pub fn as_str(&self) -> &str {
self.0.as_str()
}
/// Return an iterator over the chars as strings.
pub fn iter(&self) -> impl Iterator<Item = Str> + '_ {
self.chars().map(Into::into)
}
/// Repeat this string `n` times.
pub fn repeat(&self, n: i64) -> StrResult<Self> {
let n = usize::try_from(n)
.ok()
.and_then(|n| self.0.len().checked_mul(n).map(|_| n))
.ok_or_else(|| format!("cannot repeat this string {} times", n))?;
Ok(self.0.repeat(n).into())
}
}
impl Deref for Str {
type Target = str;
fn deref(&self) -> &str {
self.0.deref()
}
}
impl Debug for Str {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
Debug::fmt(&self.0, f)
}
}
impl Display for Str {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
f.write_char('"')?;
for c in self.chars() {
match c {
'\\' => f.write_str(r"\\")?,
'"' => f.write_str(r#"\""#)?,
'\n' => f.write_str(r"\n")?,
'\r' => f.write_str(r"\r")?,
'\t' => f.write_str(r"\t")?,
_ => f.write_char(c)?,
}
}
f.write_char('"')
}
}
impl Add for Str {
type Output = Self;
fn add(mut self, rhs: Self) -> Self::Output {
self += rhs;
self
}
}
impl AddAssign for Str {
fn add_assign(&mut self, rhs: Self) {
self.0.push_str(rhs.as_str());
}
}
impl From<char> for Str {
fn from(c: char) -> Self {
Self(c.into())
}
}
impl From<&str> for Str {
fn from(s: &str) -> Self {
Self(s.into())
}
}
impl From<String> for Str {
fn from(s: String) -> Self {
Self(s.into())
}
}
impl From<EcoString> for Str {
fn from(s: EcoString) -> Self {
Self(s)
}
}
impl From<&EcoString> for Str {
fn from(s: &EcoString) -> Self {
Self(s.clone())
}
}
impl From<Str> for EcoString {
fn from(s: Str) -> Self {
s.0
}
}
impl From<&Str> for EcoString {
fn from(s: &Str) -> Self {
s.0.clone()
}
}
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