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LibWeb: Move CSS TokenStream to its own file

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This lets us use TokenStream in StyleComputer without every user of
StyleComputer pulling in the entire CSS Parser.
This commit is contained in:
Sam Atkins 2022-09-27 16:05:57 +01:00 • committed by Andreas Kling
parent bf6d5fce18
commit 8ce38fddd9
3 changed files with 140 additions and 146 deletions
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66
Userland/Libraries/LibWeb/CSS/Parser/Parser.h
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@ -22,6 +22,7 @@
#include <LibWeb/CSS/Parser/DeclarationOrAtRule.h>
#include <LibWeb/CSS/Parser/Function.h>
#include <LibWeb/CSS/Parser/Rule.h>
#include <LibWeb/CSS/Parser/TokenStream.h>
#include <LibWeb/CSS/Parser/Tokenizer.h>
#include <LibWeb/CSS/Ratio.h>
#include <LibWeb/CSS/Selector.h>
@ -56,71 +57,6 @@ private:
AK::URL m_url;
};
template<typename T>
class TokenStream {
public:
class StateTransaction {
public:
explicit StateTransaction(TokenStream<T>& token_stream)
: m_token_stream(token_stream)
, m_saved_iterator_offset(token_stream.m_iterator_offset)
{
}
~StateTransaction()
{
if (!m_commit)
m_token_stream.m_iterator_offset = m_saved_iterator_offset;
}
StateTransaction create_child() { return StateTransaction(*this); }
void commit()
{
m_commit = true;
if (m_parent)
m_parent->commit();
}
private:
explicit StateTransaction(StateTransaction& parent)
: m_parent(&parent)
, m_token_stream(parent.m_token_stream)
, m_saved_iterator_offset(parent.m_token_stream.m_iterator_offset)
{
}
StateTransaction* m_parent { nullptr };
TokenStream<T>& m_token_stream;
int m_saved_iterator_offset { 0 };
bool m_commit { false };
};
explicit TokenStream(Vector<T> const&);
~TokenStream() = default;
TokenStream(TokenStream<T> const&) = delete;
bool has_next_token();
T const& next_token();
T const& peek_token(int offset = 0);
T const& current_token();
void reconsume_current_input_token();
StateTransaction begin_transaction() { return StateTransaction(*this); }
void skip_whitespace();
void dump_all_tokens();
private:
Vector<T> const& m_tokens;
int m_iterator_offset { -1 };
T make_eof();
T m_eof;
};
class Parser {
public:
Parser(ParsingContext const&, StringView input, String const& encoding = "utf-8");