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2023-09-03fix!: make PosTrackingReader encoding-independentMartin Fischer
While much of the span logic currently assumes UTF-8, we also want to support other character encodings, such as e.g. UTF-16 where characters can take up more or less bytes than in UTF-8.
2023-08-19fix: fix lots of position off-by-onesMartin Fischer
Previously the PosTrackingReader always mysteriously subtracted 1 from the current position ... this wasn't sound at all ... the machine just happens to often call `Tokenizer::unread_char` ... but not always. E.g. for proper comments it didn't which resulted in their offset and spans being off-by-one, which is fixed by this commit (see test_spans.rs).
2023-08-19refactor!: make Emitter generic over offset instead of readerMartin Fischer
Emitters should not have access to the reader at all. Also the current position of the reader, at the time an Emitted method is called, very much depends on machine implementation details such as if `Tokenizer::unread_char` is used. Having the Emitter methods take offsets lets the machine take care of providing the right offsets, as evidenced by the next commit.
2023-08-19refactor!: remove Span trait, just use RangeMartin Fischer
`std::mem::size_of::<Range<NoopOffset>>()` is 0 so there's no need to abstract over Range.