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This has a number of benefits:
* it hides the implementation of the map
* it hides the type used for the map values
(which lets us e.g. change name_span to name_offset while still
being able to provide a convenient `Attribute::name_span` method.)
* it lets us provide convenience impls for the map
such as `FromIterator<(String, String)>`
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Also more performant since we no longer have to update
the name span on every Emitter::push_tag_name call.
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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).
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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.
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`std::mem::size_of::<Range<NoopOffset>>()` is 0
so there's no need to abstract over Range.
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The Tokenizer does not perform any state switching, since
proper state switching requires a feedback loop between
tokenization and DOM tree building. Using the Tokenizer
directly therefore is a bit of a pitfall, since you might
not expect it to e.g. tokenize `<script><b>` as:
StartTag(StartTag { name: "script", .. })
StartTag(StartTag { name: "b", .. })
Since we don't want to make walking into pitfalls
particularly easy, this commit changes the Tokenizer::new
method so that you have to specify the Emitter.
Since this makes new_with_emitter redundant it is removed.
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The trait of the standard library is also
called IntoIterator and not Iterable.
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