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use super::parser::Parser;
use super::CharComponent;
pub fn parse_byte_literal(src: &str) -> ByteComponentIterator {
ByteComponentIterator {
parser: Parser::new(src),
has_closing_quote: false,
}
}
pub struct ByteComponentIterator<'a> {
parser: Parser<'a>,
pub has_closing_quote: bool,
}
impl<'a> Iterator for ByteComponentIterator<'a> {
type Item = CharComponent;
fn next(&mut self) -> Option<CharComponent> {
if self.parser.pos == 0 {
assert!(
self.parser.advance() == 'b',
"Byte literal should start with a `b`"
);
assert!(
self.parser.advance() == '\'',
"Byte literal should start with a `b`, followed by a quote"
);
}
if let Some(component) = self.parser.parse_char_component() {
return Some(component);
}
// We get here when there are no char components left to parse
if self.parser.peek() == Some('\'') {
self.parser.advance();
self.has_closing_quote = true;
}
assert!(
self.parser.peek() == None,
"byte literal should leave no unparsed input: src = {:?}, pos = {}, length = {}",
self.parser.src,
self.parser.pos,
self.parser.src.len()
);
None
}
}
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