291 lines
9.1 KiB
Rust
291 lines
9.1 KiB
Rust
use std::borrow::Cow;
|
|
use std::io::Read;
|
|
use std::marker::PhantomData;
|
|
use super::repr::{NestedValue, IOValue};
|
|
use super::IOResult;
|
|
use crate::error::{self, ExpectedKind, Received, io_eof};
|
|
|
|
pub type ReaderResult<T> = std::result::Result<T, error::Error>;
|
|
|
|
pub trait Reader<'de> {
|
|
fn next(&mut self, read_annotations: bool) -> IOResult<Option<IOValue>>;
|
|
fn open_record(&mut self, arity: Option<usize>) -> ReaderResult<()>;
|
|
fn open_sequence_or_set(&mut self) -> ReaderResult<()>;
|
|
fn open_sequence(&mut self) -> ReaderResult<()>;
|
|
fn open_set(&mut self) -> ReaderResult<()>;
|
|
fn open_dictionary(&mut self) -> ReaderResult<()>;
|
|
fn close_compound(&mut self) -> ReaderResult<bool>;
|
|
fn open_embedded(&mut self) -> ReaderResult<()>;
|
|
fn close_embedded(&mut self) -> ReaderResult<()>;
|
|
|
|
//---------------------------------------------------------------------------
|
|
|
|
fn skip_value(&mut self) -> IOResult<()> {
|
|
// TODO efficient skipping in specific impls of this trait
|
|
let _ = self.demand_next(false)?;
|
|
Ok(())
|
|
}
|
|
|
|
fn demand_next(&mut self, read_annotations: bool) -> IOResult<IOValue> {
|
|
self.next(read_annotations)?.ok_or_else(io_eof)
|
|
}
|
|
|
|
fn next_boolean(&mut self) -> ReaderResult<bool> { self.demand_next(false)?.value().to_boolean() }
|
|
fn next_i8(&mut self) -> ReaderResult<i8> { self.demand_next(false)?.value().to_i8() }
|
|
fn next_u8(&mut self) -> ReaderResult<u8> { self.demand_next(false)?.value().to_u8() }
|
|
fn next_i16(&mut self) -> ReaderResult<i16> { self.demand_next(false)?.value().to_i16() }
|
|
fn next_u16(&mut self) -> ReaderResult<u16> { self.demand_next(false)?.value().to_u16() }
|
|
fn next_i32(&mut self) -> ReaderResult<i32> { self.demand_next(false)?.value().to_i32() }
|
|
fn next_u32(&mut self) -> ReaderResult<u32> { self.demand_next(false)?.value().to_u32() }
|
|
fn next_i64(&mut self) -> ReaderResult<i64> { self.demand_next(false)?.value().to_i64() }
|
|
fn next_u64(&mut self) -> ReaderResult<u64> { self.demand_next(false)?.value().to_u64() }
|
|
fn next_i128(&mut self) -> ReaderResult<i128> { self.demand_next(false)?.value().to_i128() }
|
|
fn next_u128(&mut self) -> ReaderResult<u128> { self.demand_next(false)?.value().to_u128() }
|
|
fn next_f32(&mut self) -> ReaderResult<f32> { self.demand_next(false)?.value().to_f32() }
|
|
fn next_f64(&mut self) -> ReaderResult<f64> { self.demand_next(false)?.value().to_f64() }
|
|
fn next_char(&mut self) -> ReaderResult<char> { self.demand_next(false)?.value().to_char() }
|
|
|
|
fn next_str(&mut self) -> ReaderResult<Cow<'de, str>> {
|
|
Ok(Cow::Owned(self.demand_next(false)?.value().to_string()?.to_owned()))
|
|
}
|
|
|
|
fn next_bytestring(&mut self) -> ReaderResult<Cow<'de, [u8]>> {
|
|
Ok(Cow::Owned(self.demand_next(false)?.value().to_bytestring()?.to_owned()))
|
|
}
|
|
|
|
fn next_symbol(&mut self) -> ReaderResult<Cow<'de, str>> {
|
|
Ok(Cow::Owned(self.demand_next(false)?.value().to_symbol()?.to_owned()))
|
|
}
|
|
|
|
fn open_option(&mut self) -> ReaderResult<bool>
|
|
{
|
|
self.open_record(None)?;
|
|
let label: &str = &self.next_symbol()?;
|
|
match label {
|
|
"None" => Ok(false),
|
|
"Some" => Ok(true),
|
|
_ => Err(error::Error::Expected(ExpectedKind::Option,
|
|
Received::ReceivedRecordWithLabel(label.to_owned()))),
|
|
}
|
|
}
|
|
|
|
fn open_simple_record(&mut self, name: &str, arity: Option<usize>) -> ReaderResult<()>
|
|
{
|
|
self.open_record(arity)?;
|
|
let label: &str = &self.next_symbol()?;
|
|
if label == name {
|
|
Ok(())
|
|
} else {
|
|
Err(error::Error::Expected(ExpectedKind::SimpleRecord(name.to_owned(), arity),
|
|
Received::ReceivedRecordWithLabel(label.to_owned())))
|
|
}
|
|
}
|
|
|
|
fn configured(self, read_annotations: bool) -> ConfiguredReader<'de, Self>
|
|
where
|
|
Self: std::marker::Sized
|
|
{
|
|
ConfiguredReader {
|
|
reader: self,
|
|
read_annotations,
|
|
phantom: PhantomData,
|
|
}
|
|
}
|
|
|
|
fn skip_remainder(&mut self) -> ReaderResult<()> {
|
|
while !self.close_compound()? {
|
|
self.skip_value()?;
|
|
}
|
|
Ok(())
|
|
}
|
|
|
|
fn ensure_more_expected(&mut self) -> ReaderResult<()> {
|
|
if !self.close_compound()? {
|
|
Ok(())
|
|
} else {
|
|
Err(error::Error::MissingItem)
|
|
}
|
|
}
|
|
|
|
fn ensure_complete(&mut self) -> ReaderResult<()> {
|
|
if !self.close_compound()? {
|
|
Err(error::Error::MissingCloseDelimiter)
|
|
} else {
|
|
Ok(())
|
|
}
|
|
}
|
|
}
|
|
|
|
impl<'r, 'de, R: Reader<'de>> Reader<'de> for &'r mut R {
|
|
fn next(&mut self, read_annotations: bool) -> IOResult<Option<IOValue>> {
|
|
(*self).next(read_annotations)
|
|
}
|
|
|
|
fn open_record(&mut self, arity: Option<usize>) -> ReaderResult<()> {
|
|
(*self).open_record(arity)
|
|
}
|
|
|
|
fn open_sequence_or_set(&mut self) -> ReaderResult<()> {
|
|
(*self).open_sequence_or_set()
|
|
}
|
|
|
|
fn open_sequence(&mut self) -> ReaderResult<()> {
|
|
(*self).open_sequence()
|
|
}
|
|
|
|
fn open_set(&mut self) -> ReaderResult<()> {
|
|
(*self).open_set()
|
|
}
|
|
|
|
fn open_dictionary(&mut self) -> ReaderResult<()> {
|
|
(*self).open_dictionary()
|
|
}
|
|
|
|
fn close_compound(&mut self) -> ReaderResult<bool> {
|
|
(*self).close_compound()
|
|
}
|
|
|
|
fn open_embedded(&mut self) -> ReaderResult<()> {
|
|
(*self).open_embedded()
|
|
}
|
|
|
|
fn close_embedded(&mut self) -> ReaderResult<()> {
|
|
(*self).close_embedded()
|
|
}
|
|
}
|
|
|
|
|
|
pub trait BinarySource<'de> {
|
|
fn skip(&mut self) -> IOResult<()>;
|
|
fn peek(&mut self) -> IOResult<u8>;
|
|
fn readbytes(&mut self, count: usize) -> IOResult<Cow<'de, [u8]>>;
|
|
fn readbytes_into(&mut self, bs: &mut [u8]) -> IOResult<()>;
|
|
}
|
|
|
|
pub struct IOBinarySource<'a, R: Read> {
|
|
pub read: &'a mut R,
|
|
pub buf: Option<u8>,
|
|
}
|
|
|
|
impl<'a, R: Read> IOBinarySource<'a, R> {
|
|
pub fn new(read: &'a mut R) -> Self {
|
|
IOBinarySource { read, buf: None }
|
|
}
|
|
}
|
|
|
|
impl<'de, 'a, R: Read> BinarySource<'de> for IOBinarySource<'a, R> {
|
|
fn skip(&mut self) -> IOResult<()> {
|
|
if self.buf.is_none() { unreachable!(); }
|
|
self.buf = None;
|
|
Ok(())
|
|
}
|
|
|
|
fn peek(&mut self) -> IOResult<u8> {
|
|
match self.buf {
|
|
Some(b) => Ok(b),
|
|
None => {
|
|
let b = &mut [0];
|
|
match self.read.read(b)? {
|
|
0 => Err(io_eof()),
|
|
1 => {
|
|
self.buf = Some(b[0]);
|
|
Ok(b[0])
|
|
}
|
|
_ => unreachable!(),
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
fn readbytes(&mut self, count: usize) -> IOResult<Cow<'de, [u8]>> {
|
|
if self.buf.is_some() { unreachable!(); }
|
|
let mut bs = vec![0; count];
|
|
self.read.read_exact(&mut bs)?;
|
|
Ok(Cow::Owned(bs))
|
|
}
|
|
|
|
fn readbytes_into(&mut self, bs: &mut [u8]) -> IOResult<()> {
|
|
if self.buf.is_some() { unreachable!(); }
|
|
self.read.read_exact(bs)
|
|
}
|
|
}
|
|
|
|
pub struct BytesBinarySource<'de> {
|
|
pub bytes: &'de [u8],
|
|
pub index: usize,
|
|
}
|
|
|
|
impl<'de> BytesBinarySource<'de> {
|
|
pub fn new(bytes: &'de [u8]) -> Self {
|
|
BytesBinarySource { bytes, index: 0 }
|
|
}
|
|
}
|
|
|
|
impl<'de> BinarySource<'de> for BytesBinarySource<'de> {
|
|
fn skip(&mut self) -> IOResult<()> {
|
|
if self.index >= self.bytes.len() { unreachable!(); }
|
|
self.index += 1;
|
|
Ok(())
|
|
}
|
|
|
|
fn peek(&mut self) -> IOResult<u8> {
|
|
if self.index >= self.bytes.len() {
|
|
Err(io_eof())
|
|
} else {
|
|
Ok(self.bytes[self.index])
|
|
}
|
|
}
|
|
|
|
fn readbytes(&mut self, count: usize) -> IOResult<Cow<'de, [u8]>> {
|
|
if self.index + count > self.bytes.len() {
|
|
Err(io_eof())
|
|
} else {
|
|
let bs = &self.bytes[self.index..self.index+count];
|
|
self.index += count;
|
|
Ok(Cow::Borrowed(bs))
|
|
}
|
|
}
|
|
|
|
fn readbytes_into(&mut self, bs: &mut [u8]) -> IOResult<()> {
|
|
let count = bs.len();
|
|
if self.index + count > self.bytes.len() {
|
|
Err(io_eof())
|
|
} else {
|
|
bs.copy_from_slice(&self.bytes[self.index..self.index+count]);
|
|
self.index += count;
|
|
Ok(())
|
|
}
|
|
}
|
|
}
|
|
|
|
pub struct ConfiguredReader<'de, R: Reader<'de>> {
|
|
pub reader: R,
|
|
pub read_annotations: bool,
|
|
phantom: PhantomData<&'de ()>,
|
|
}
|
|
|
|
impl<'de, R: Reader<'de>> ConfiguredReader<'de, R> {
|
|
pub fn new(reader: R) -> Self {
|
|
reader.configured(true)
|
|
}
|
|
|
|
pub fn set_read_annotations(&mut self, read_annotations: bool) {
|
|
self.read_annotations = read_annotations
|
|
}
|
|
|
|
pub fn demand_next(&mut self) -> IOResult<IOValue> {
|
|
self.reader.demand_next(self.read_annotations)
|
|
}
|
|
}
|
|
|
|
impl<'de, R: Reader<'de>> std::iter::Iterator for ConfiguredReader<'de, R> {
|
|
type Item = IOResult<IOValue>;
|
|
fn next(&mut self) -> Option<Self::Item> {
|
|
match self.reader.next(self.read_annotations) {
|
|
Err(e) => Some(Err(e)),
|
|
Ok(None) => None,
|
|
Ok(Some(v)) => Some(Ok(v)),
|
|
}
|
|
}
|
|
}
|