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use super::{BinaryReader, BinaryReaderError, Operator, Result};
#[derive(Clone)]
pub struct OperatorsReader<'a> {
pub(crate) reader: BinaryReader<'a>,
}
impl<'a> OperatorsReader<'a> {
pub(crate) fn new<'b>(data: &'a [u8], offset: usize) -> OperatorsReader<'b>
where
'a: 'b,
{
OperatorsReader {
reader: BinaryReader::new_with_offset(data, offset),
}
}
pub fn eof(&self) -> bool {
self.reader.eof()
}
pub fn original_position(&self) -> usize {
self.reader.original_position()
}
pub fn ensure_end(&self) -> Result<()> {
if self.eof() {
return Ok(());
}
Err(BinaryReaderError::new(
"Unexpected data at the end of operators",
self.reader.original_position(),
))
}
pub fn read<'b>(&mut self) -> Result<Operator<'b>>
where
'a: 'b,
{
self.reader.read_operator()
}
pub fn into_iter_with_offsets<'b>(self) -> OperatorsIteratorWithOffsets<'b>
where
'a: 'b,
{
OperatorsIteratorWithOffsets {
reader: self,
err: false,
}
}
pub fn read_with_offset<'b>(&mut self) -> Result<(Operator<'b>, usize)>
where
'a: 'b,
{
let pos = self.reader.original_position();
Ok((self.read()?, pos))
}
}
impl<'a> IntoIterator for OperatorsReader<'a> {
type Item = Result<Operator<'a>>;
type IntoIter = OperatorsIterator<'a>;
fn into_iter(self) -> Self::IntoIter {
OperatorsIterator {
reader: self,
err: false,
}
}
}
pub struct OperatorsIterator<'a> {
reader: OperatorsReader<'a>,
err: bool,
}
impl<'a> Iterator for OperatorsIterator<'a> {
type Item = Result<Operator<'a>>;
fn next(&mut self) -> Option<Self::Item> {
if self.err || self.reader.eof() {
return None;
}
let result = self.reader.read();
self.err = result.is_err();
Some(result)
}
}
pub struct OperatorsIteratorWithOffsets<'a> {
reader: OperatorsReader<'a>,
err: bool,
}
impl<'a> Iterator for OperatorsIteratorWithOffsets<'a> {
type Item = Result<(Operator<'a>, usize)>;
fn next(&mut self) -> Option<Self::Item> {
if self.err || self.reader.eof() {
return None;
}
let result = self.reader.read_with_offset();
self.err = result.is_err();
Some(result)
}
}