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use crate::ast;
use crate::{
Parse, ParseError, Parser, Resolve, ResolveError, ResolveErrorKind, ResolveOwned, Spanned,
Storage, ToTokens,
};
use runestick::{Source, Span};
use std::borrow::Cow;
#[derive(Debug, Clone, PartialEq, Eq, ToTokens, Spanned)]
pub struct LitStr {
pub token: ast::Token,
#[rune(skip)]
pub source: ast::StrSource,
}
impl LitStr {
pub(crate) fn resolve_template_string<'a>(
&self,
storage: &Storage,
source: &'a Source,
) -> Result<Cow<'a, str>, ResolveError> {
self.resolve_string(storage, source, ast::utils::WithTemplate(true))
}
pub(crate) fn resolve_string<'a>(
&self,
storage: &Storage,
source: &'a Source,
with_template: ast::utils::WithTemplate,
) -> Result<Cow<'a, str>, ResolveError> {
let span = self.token.span();
let text = match self.source {
ast::StrSource::Text(text) => text,
ast::StrSource::Synthetic(id) => {
let bytes = storage.get_string(id).ok_or_else(|| {
ResolveError::new(
span,
ResolveErrorKind::BadSyntheticId { kind: "string", id },
)
})?;
return Ok(Cow::Owned(bytes));
}
};
let span = if text.wrapped { span.narrow(1) } else { span };
let string = source
.source(span)
.ok_or_else(|| ResolveError::new(span, ResolveErrorKind::BadSlice))?;
Ok(if text.escaped {
Cow::Owned(Self::parse_escaped(span, string, with_template)?)
} else {
Cow::Borrowed(string)
})
}
fn parse_escaped(
span: Span,
source: &str,
with_template: ast::utils::WithTemplate,
) -> Result<String, ResolveError> {
let mut buffer = String::with_capacity(source.len());
let start = span.start.into_usize();
let mut it = source
.char_indices()
.map(|(n, c)| (start + n, c))
.peekable();
while let Some((start, c)) = it.next() {
buffer.extend(match c {
'\\' => match ast::utils::parse_char_escape(
&mut it,
with_template,
ast::utils::WithLineCont(true),
) {
Ok(c) => c,
Err(kind) => {
let end = it
.next()
.map(|n| n.0)
.unwrap_or_else(|| span.end.into_usize());
return Err(ResolveError::new(Span::new(start, end), kind));
}
},
c => Some(c),
});
}
Ok(buffer)
}
}
impl Parse for LitStr {
fn parse(parser: &mut Parser<'_>) -> Result<Self, ParseError> {
let token = parser.next()?;
match token.kind {
K![str(source)] => Ok(Self { token, source }),
_ => Err(ParseError::expected(&token, "string literal")),
}
}
}
impl<'a> Resolve<'a> for LitStr {
type Output = Cow<'a, str>;
fn resolve(&self, storage: &Storage, source: &'a Source) -> Result<Cow<'a, str>, ResolveError> {
self.resolve_string(storage, source, ast::utils::WithTemplate(false))
}
}
impl ResolveOwned for LitStr {
type Owned = String;
fn resolve_owned(
&self,
storage: &Storage,
source: &Source,
) -> Result<Self::Owned, ResolveError> {
Ok(self.resolve(storage, source)?.into_owned())
}
}