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//! S-Expression support.
//!
//! This implements parsing of [S-Expressions] encoded using the
//! canonical and basic transport encoding.
//!
//! [S-Expressions]: https://people.csail.mit.edu/rivest/Sexp.txt
use std::cmp;
use std::io::{Read, Write};
use std::path::Path;
use buffered_reader::{self, BufferedReader};
use lalrpop_util::{lalrpop_mod, ParseError};
use sequoia_openpgp as openpgp;
use openpgp::parse::Parse;
use openpgp::Error;
use crate::Result;
use crate::sexp::Sexp;
mod lexer;
use self::lexer::Lexer;
// Load the generated code.
lalrpop_mod!(
#[allow(clippy::all)]
#[allow(missing_docs, unused_parens)]
grammar,
"/sexp/parse/grammar.rs"
);
impl<'a> Parse<'a, Sexp> for Sexp {
fn from_reader<R: 'a + Read>(reader: R) -> Result<Sexp> {
Self::from_bytes(
buffered_reader::Generic::new(reader, None).data_eof()?)
}
fn from_file<P: AsRef<Path>>(path: P) -> Result<Sexp> {
Self::from_bytes(
buffered_reader::File::open(path)?.data_eof()?)
}
fn from_bytes<D: AsRef<[u8]> + ?Sized>(data: &'a D) -> Result<Sexp> {
Self::from_bytes_private(data.as_ref())
}
}
impl Sexp {
fn from_bytes_private(data: &[u8]) -> Result<Sexp> {
match self::grammar::SexprParser::new().parse(Lexer::new(data)) {
Ok(r) => Ok(r),
Err(err) => {
let mut msg = Vec::new();
writeln!(&mut msg, "Parsing: {:?}: {:?}", data, err)?;
if let ParseError::UnrecognizedToken {
token: (start, _, end), ..
} = err
{
writeln!(&mut msg, "Context:")?;
let chars = data.iter().enumerate()
.filter_map(|(i, c)| {
if cmp::max(8, start) - 8 <= i
&& i <= end + 8
{
Some((i, c))
} else {
None
}
});
for (i, c) in chars {
writeln!(&mut msg, "{} {} {}: {:?}",
if i == start { "*" } else { " " },
i,
*c as char,
c)?;
}
}
Err(Error::InvalidArgument(String::from_utf8_lossy(&msg)
.to_string()).into())
},
}
}
}
#[cfg(test)]
mod tests {
use crate::sexp::{Sexp, String_};
use sequoia_openpgp::parse::Parse;
#[test]
fn basics() {
assert_eq!(Sexp::from_bytes(b"()").unwrap(),
Sexp::List(vec![]));
assert_eq!(Sexp::from_bytes(b"2:hi").unwrap(),
Sexp::String(b"hi"[..].into()));
assert_eq!(Sexp::from_bytes(b"[5:fancy]2:hi").unwrap(),
Sexp::String(String_::with_display_hint(
b"hi".to_vec(), b"fancy".to_vec())));
assert_eq!(Sexp::from_bytes(b"(2:hi2:ho)").unwrap(),
Sexp::List(vec![
Sexp::String(b"hi"[..].into()),
Sexp::String(b"ho"[..].into()),
]));
assert_eq!(Sexp::from_bytes(b"(2:hi[5:fancy]2:ho)").unwrap(),
Sexp::List(vec![
Sexp::String(b"hi"[..].into()),
Sexp::String(String_::with_display_hint(
b"ho".to_vec(), b"fancy".to_vec())),
]));
assert_eq!(Sexp::from_bytes(b"(2:hi(2:ha2:ho))").unwrap(),
Sexp::List(vec![
Sexp::String(b"hi"[..].into()),
Sexp::List(vec![
Sexp::String(b"ha"[..].into()),
Sexp::String(b"ho"[..].into()),
]),
]));
assert_eq!(Sexp::from_bytes(b"(7:sig-val(3:rsa(1:s3:abc)))").unwrap(),
Sexp::List(vec![
Sexp::String(b"sig-val"[..].into()),
Sexp::List(vec![
Sexp::String(b"rsa"[..].into()),
Sexp::List(vec![
Sexp::String(b"s"[..].into()),
Sexp::String(b"abc"[..].into()),
]),
]),
]));
assert!(Sexp::from_bytes(b"").is_err());
assert!(Sexp::from_bytes(b"(").is_err());
assert!(Sexp::from_bytes(b"(2:hi").is_err());
assert!(Sexp::from_bytes(b"(2:hi)(2:hi)").is_err());
assert!(Sexp::from_bytes(b"([2:hi])").is_err());
}
#[test]
fn signatures() {
assert!(Sexp::from_bytes(
crate::tests::file("sexp/dsa-signature.sexp")).is_ok());
assert!(Sexp::from_bytes(
crate::tests::file("sexp/ecdsa-signature.sexp")).is_ok());
assert!(Sexp::from_bytes(
crate::tests::file("sexp/eddsa-signature.sexp")).is_ok());
assert!(Sexp::from_bytes(
crate::tests::file("sexp/rsa-signature.sexp")).is_ok());
}
}
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