bb82ee5530
This fixes the crash that Luke found using Domato:
```css
. foo {
mso-border-alt: solid .-1pt;
}
```
The spec distinguishes between "If the next 3 code points would
start..." and "If the input stream starts with..." but we were treating
them the same way, skipping the first code point in the process.
113 lines
2.9 KiB
C++
113 lines
2.9 KiB
C++
/*
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* Copyright (c) 2020-2021, the SerenityOS developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Optional.h>
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#include <AK/String.h>
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#include <AK/StringView.h>
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#include <AK/Types.h>
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#include <AK/Utf8View.h>
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#include <LibWeb/CSS/Parser/Token.h>
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#include <LibWeb/Forward.h>
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namespace Web::CSS {
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class U32Twin {
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public:
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void set(size_t index, u32 value)
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{
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if (index == 0)
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first = value;
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if (index == 1)
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second = value;
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}
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u32 first {};
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u32 second {};
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};
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class U32Triplet {
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public:
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void set(size_t index, u32 value)
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{
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if (index == 0)
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first = value;
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if (index == 1)
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second = value;
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if (index == 2)
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third = value;
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}
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U32Twin to_twin_12()
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{
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return { first, second };
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}
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U32Twin to_twin_23()
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{
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return { second, third };
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}
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u32 first {};
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u32 second {};
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u32 third {};
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};
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class CSSNumber {
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public:
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String string;
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double value { 0 };
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Token::NumberType type {};
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};
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class Tokenizer {
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public:
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explicit Tokenizer(StringView input, const String& encoding);
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[[nodiscard]] Vector<Token> parse();
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[[nodiscard]] static Token create_eof_token();
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private:
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[[nodiscard]] u32 next_code_point();
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[[nodiscard]] u32 peek_code_point(size_t offset = 0) const;
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[[nodiscard]] U32Twin peek_twin() const;
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[[nodiscard]] U32Triplet peek_triplet() const;
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[[nodiscard]] U32Twin start_of_input_stream_twin();
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[[nodiscard]] U32Triplet start_of_input_stream_triplet();
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[[nodiscard]] static Token create_new_token(Token::Type);
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[[nodiscard]] static Token create_value_token(Token::Type, String value);
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[[nodiscard]] static Token create_value_token(Token::Type, u32 value);
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[[nodiscard]] Token consume_a_token();
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[[nodiscard]] Token consume_string_token(u32 ending_code_point);
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[[nodiscard]] Token consume_a_numeric_token();
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[[nodiscard]] Token consume_an_ident_like_token();
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[[nodiscard]] CSSNumber consume_a_number();
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[[nodiscard]] double convert_a_string_to_a_number(StringView);
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[[nodiscard]] String consume_a_name();
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[[nodiscard]] u32 consume_escaped_code_point();
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[[nodiscard]] Token consume_a_url_token();
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void consume_the_remnants_of_a_bad_url();
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void consume_comments();
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void consume_as_much_whitespace_as_possible();
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void reconsume_current_input_code_point();
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[[nodiscard]] static bool is_valid_escape_sequence(U32Twin);
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[[nodiscard]] bool would_start_an_identifier();
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[[nodiscard]] bool would_start_an_identifier(U32Triplet);
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[[nodiscard]] static bool would_start_a_number(U32Triplet);
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String m_decoded_input;
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Utf8View m_utf8_view;
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AK::Utf8CodePointIterator m_utf8_iterator;
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AK::Utf8CodePointIterator m_prev_utf8_iterator;
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Token::Position m_position;
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Token::Position m_prev_position;
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};
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}
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