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LibWeb: Parse CSS background-position
property
This is done a bit differently from other properties: using a TokenStream instead of just a Vector of ComponentValues. The reason for this is, we can then use call the same function when parsing the `background` shorthand. Otherwise, we would have to know in advance how many values to pass down, which basically would involve duplicating the `background-position` parsing code inside `background`. The StyleValue is PositionStyleValue, since it represents a `<position>`: https://www.w3.org/TR/css-values-4/#typedef-position Unfortunately, background-position's parsing is a bit different from `<position>`'s, (background-position allows 3-value syntax and `<position>` doesn't) so we'll need to come back and write a different parsing function for that later.
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6 changed files with 260 additions and 2 deletions
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@ -214,6 +214,8 @@ private:
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static RefPtr<StyleValue> parse_image_value(ParsingContext const&, StyleComponentValueRule const&);
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static RefPtr<StyleValue> parse_background_value(ParsingContext const&, Vector<StyleComponentValueRule> const&);
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static RefPtr<StyleValue> parse_background_image_value(ParsingContext const&, Vector<StyleComponentValueRule> const&);
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static RefPtr<StyleValue> parse_single_background_position_value(ParsingContext const&, TokenStream<StyleComponentValueRule>&);
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static RefPtr<StyleValue> parse_background_position_value(ParsingContext const&, Vector<StyleComponentValueRule> const&);
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static RefPtr<StyleValue> parse_background_repeat_value(ParsingContext const&, Vector<StyleComponentValueRule> const&);
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static RefPtr<StyleValue> parse_border_value(ParsingContext const&, Vector<StyleComponentValueRule> const&);
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static RefPtr<StyleValue> parse_border_radius_value(ParsingContext const&, Vector<StyleComponentValueRule> const&);
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