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We'll reuse the field for another offset in the next commit.
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Conceptually the tokenizer emits tokens, which are then handled in the
tree construction stage (which this crate doesn't yet implement).
While the tokenizer can operate almost entirely based on its state
(which may be changed via Tokenizer::set_state) and its internal state,
there is the exception of the 'Markup declaration open state'[1], the third
condition of which depends on the "adjusted current node", which in turn
depends on the "stack of open elements" only known to the tree constructor.
In 82898967320f90116bbc686ab7ffc2f61ff456c4 I tried to address this
by adding the adjusted_current_node_present_and_not_in_html_namespace
method to the Emitter trait. What I missed was that adding this method
to the Emitter trait effectively crippled the composability of the API.
You should be able to do the following:
struct TreeConstructor<R, O> {
tokenizer: Tokenizer<R, O, SomeEmitter<O>>,
stack_of_open_elements: Vec<NodeId>,
// ...
}
However this doesn't work if the implementation of SomeEmitter
depends on the stack_of_open_elements field.
This commits remedies this oversight by removing this method and
instead making the Tokenizer yield values of a new Event enum:
enum Event<T> { Token(T), CdataOpen }
Event::CdataOpen signals that the new Tokenizer::handle_cdata_open
method has to be called, which accepts a CdataAction:
enum CdataAction { Cdata, BogusComment }
the variants of which correspond exactly to the possible outcomes
of the third condition of the 'Markup declaration open state'.
Removing this method also has the added benefit that the DefaultEmitter
is now again spec-compliant, which lets us expose it again in the next
commit in good conscience (previously it just hard-coded the method
implementation to return false, which is why I had removed the
DefaultEmitter from the public API in the last release).
[1]: https://html.spec.whatwg.org/multipage/parsing.html#markup-declaration-open-state
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Just a bit more succinct. And now rustdoc also no longer
cuts off the names of these Emitter methods in its sidebar.
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Note that while making this breaking change, we're also swapping
the parameter order for more consistency so that the reader
parameter always comes last in Emitter methods.
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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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This is primarily done to make the rustdoc more readable
(by grouping Reader, IntoReader, StringReader and BufReadReader
in the reader module). Ideally IntoReader is already implemented
for your input type and you don't have to concern yourself
with these traits / types at all.
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Before the following happened:
% printf '<script><b>test</b></script>' | cargo run --example=switch-state
StartTag(StartTag { self_closing: false, name: "script", attributes: {} })
String("<b>test")
EndTag(EndTag { name: "b" })
EndTag(EndTag { name: "script" })
Which is obviously wrong. After a <script> tag we want to switch to the
ScriptData state (instead of the Data state).
This commit fixes this implementation error, making the above command
produce the expected output of:
StartTag(StartTag { self_closing: false, name: "script", attributes: {} })
String("<b>test</b>")
EndTag(EndTag { name: "script" })
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purpose: don't want to expose self.to_reconsume to the consume() method
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