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use std::{fmt, ops::Range};
use crate::{
Buffer, ParseError,
err::{perr, ParseErrorKind::*},
escape::{scan_raw_string, unescape_string},
};
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct ByteStringLit<B: Buffer> {
raw: B,
value: Option<Vec<u8>>,
num_hashes: Option<u32>,
}
impl<B: Buffer> ByteStringLit<B> {
pub fn parse(input: B) -> Result<Self, ParseError> {
if input.is_empty() {
return Err(perr(None, Empty));
}
if !input.starts_with(r#"b""#) && !input.starts_with("br") {
return Err(perr(None, InvalidByteStringLiteralStart));
}
Self::parse_impl(input)
}
pub fn value(&self) -> &[u8] {
self.value.as_deref().unwrap_or(&self.raw.as_bytes()[self.inner_range()])
}
pub fn into_value(self) -> B::ByteCow {
let inner_range = self.inner_range();
let Self { raw, value, .. } = self;
value.map(B::ByteCow::from).unwrap_or_else(|| raw.cut(inner_range).into_byte_cow())
}
pub fn is_raw_byte_string(&self) -> bool {
self.num_hashes.is_some()
}
fn inner_range(&self) -> Range<usize> {
match self.num_hashes {
None => 2..self.raw.len() - 1,
Some(n) => 2 + n as usize + 1..self.raw.len() - n as usize - 1,
}
}
pub(crate) fn parse_impl(input: B) -> Result<Self, ParseError> {
if input.starts_with(r"br") {
let (value, num_hashes) = scan_raw_string::<u8>(&input, 2)?;
Ok(Self {
raw: input,
value: value.map(|s| s.into_bytes()),
num_hashes: Some(num_hashes),
})
} else {
let value = unescape_string::<u8>(&input, 2)?.map(|s| s.into_bytes());
Ok(Self {
raw: input,
value,
num_hashes: None,
})
}
}
}
impl ByteStringLit<&str> {
pub fn into_owned(self) -> ByteStringLit<String> {
ByteStringLit {
raw: self.raw.to_owned(),
value: self.value,
num_hashes: self.num_hashes,
}
}
}
impl<B: Buffer> fmt::Display for ByteStringLit<B> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.pad(&self.raw)
}
}
#[cfg(test)]
mod tests;