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AK: Stop allowing implicit downcast with RefPtr and NonnullRefPtr

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We were allowing this dangerous kind of thing:

RefPtr<Base> base;
RefPtr<Derived> derived = base;

This patch changes the {Nonnull,}RefPtr constructors so this is no
longer possible.

To downcast one of these pointers, there is now static_ptr_cast<T>:

RefPtr<Derived> derived = static_ptr_cast<Derived>(base);

Fixing this exposed a ton of cowboy-downcasts in various places,
which we're now forced to fix. :^)
This commit is contained in:
Andreas Kling 2020-04-05 11:11:07 +02:00
parent 058c614110
commit 1d468ed6d3
11 changed files with 68 additions and 54 deletions
Download patch file Download diff file Expand all files Collapse all files

41
Libraries/LibWeb/Parser/CSSParser.cpp
View file

@ -153,39 +153,40 @@ NonnullRefPtr<StyleValue> parse_css_value(const StringView& string)
return StringStyleValue::create(string);
}
RefPtr<StyleValue> parse_line_width(const StringView& part)
RefPtr<LengthStyleValue> parse_line_width(const StringView& part)
{
NonnullRefPtr<StyleValue> value = parse_css_value(part);
if (value->is_length())
return value;
return static_ptr_cast<LengthStyleValue>(value);
return nullptr;
}
RefPtr<StyleValue> parse_color(const StringView& part)
RefPtr<ColorStyleValue> parse_color(const StringView& part)
{
NonnullRefPtr<StyleValue> value = parse_css_value(part);
if (value->is_color())
return value;
return static_ptr_cast<ColorStyleValue>(value);
return nullptr;
}
RefPtr<StyleValue> parse_line_style(const StringView& part)
RefPtr<StringStyleValue> parse_line_style(const StringView& part)
{
NonnullRefPtr<StyleValue> value = parse_css_value(part);
if (value->is_string()) {
if (value->to_string() == "dotted")
return value;
if (value->to_string() == "dashed")
return value;
if (value->to_string() == "solid")
return value;
if (value->to_string() == "double")
return value;
if (value->to_string() == "groove")
return value;
if (value->to_string() == "ridge")
return value;
}
NonnullRefPtr<StyleValue> parsed_value = parse_css_value(part);
if (!parsed_value->is_string())
return nullptr;
auto value = static_ptr_cast<StringStyleValue>(parsed_value);
if (value->to_string() == "dotted")
return value;
if (value->to_string() == "dashed")
return value;
if (value->to_string() == "solid")
return value;
if (value->to_string() == "double")
return value;
if (value->to_string() == "groove")
return value;
if (value->to_string() == "ridge")
return value;
return nullptr;
}