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LibWeb: Add basic support for dynamic markup insertion

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This implements basic support for dynamic markup insertion, adding
 * Document::open()
 * Document::write(Vector<String> const&)
 * Document::writeln(Vector<String> const&)
 * Document::close()

The HTMLParser is modified to make it possible to create a
script-created parser which initially only contains a HTMLTokenizer
without any data. Aditionally the HTMLParser::run method gains an
overload which does not modify the Document and does not run
HTMLParser::the_end() so that we can reenter the parser at a later time.
Furthermore all FIXMEs that consern the insertion point are implemented
wich is defined in the HTMLTokenizer. Additionally the following
member-variables of the HTMLParser are now exposed by getter funcions:
 * m_tokenizer
 * m_aborted
 * m_script_nesting_level

The HTMLTokenizer is modified so that it contains an insertion
point which keeps track of where the next input from the Document::write
functions will be inserted. The insertion point is implemented as the
charakter offset into m_decoded_input and a boolean describing if the
insertion point is defined. Functions to update, check and {re}store the
insertion point are also added.
The function HTMLTokenizer::insert_eof is added to tell a script-created
parser that document::close was called and HTMLParser::the_end() should
be called.
Lastly an explicit default constructor is added to HTMLTokenizer to
create a empty HTMLTokenizer into which data can be inserted.
This commit is contained in:
Lorenz Steinert 2022-02-19 15:58:21 +01:00 • committed by Andreas Kling
parent d29d9462e9
commit db789813c9
7 changed files with 282 additions and 19 deletions
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27
Userland/Libraries/LibWeb/HTML/Parser/HTMLTokenizer.h
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@ -101,6 +101,7 @@ namespace Web::HTML {
class HTMLTokenizer {
public:
explicit HTMLTokenizer();
explicit HTMLTokenizer(StringView input, String const& encoding);
enum class State {
@ -124,6 +125,24 @@ public:
String source() const { return m_decoded_input; }
void insert_input_at_insertion_point(String const& input);
void insert_eof();
bool is_eof_inserted();
bool is_insertion_point_defined() const { return m_insertion_point.defined; }
bool is_insertion_point_reached()
{
return m_insertion_point.defined && m_insertion_point.position >= m_utf8_view.iterator_offset(m_utf8_iterator);
}
void undefine_insertion_point() { m_insertion_point.defined = false; }
void store_insertion_point() { m_old_insertion_point = m_insertion_point; }
void restore_insertion_point() { m_insertion_point = m_old_insertion_point; }
void update_insertion_point()
{
m_insertion_point.defined = true;
m_insertion_point.position = m_utf8_view.iterator_offset(m_utf8_iterator);
}
private:
void skip(size_t count);
Optional<u32> next_code_point();
@ -163,6 +182,13 @@ private:
String m_decoded_input;
struct InsertionPoint {
size_t position { 0 };
bool defined { false };
};
InsertionPoint m_insertion_point {};
InsertionPoint m_old_insertion_point {};
Utf8View m_utf8_view;
Utf8CodePointIterator m_utf8_iterator;
Utf8CodePointIterator m_prev_utf8_iterator;
@ -172,6 +198,7 @@ private:
Optional<String> m_last_emitted_start_tag_name;
bool m_explicit_eof_inserted { false };
bool m_has_emitted_eof { false };
Queue<HTMLToken> m_queued_tokens;