LibHTML: Start building a simple code generator for CSS properties

Code for parsing and stringifying CSS properties is now generated based
on LibHTML/CSS/Properties.json

At the moment, the file tells us three things:

- The name of a property
- Its initial value
- Whether it's inherited

Also, for shorthand properties, it provides a list of all the longhand
properties it may expand too. This is not actually used in the engine
yet though.

This *finally* makes layout tree dumps show the names of CSS properties
in effect, instead of "CSS::PropertyID(32)" and such. :^)

1 files changed, 3 insertions, 50 deletions

diff --git a/Libraries/LibHTML/Parser/CSSParser.cpp b/Libraries/LibHTML/Parser/CSSParser.cpp
index 4d8e8e0f3f..97ec907304 100644
--- a/Libraries/LibHTML/Parser/CSSParser.cpp
+++ b/Libraries/LibHTML/Parser/CSSParser.cpp
@@ -1,4 +1,5 @@
 #include <AK/HashMap.h>
+#include <LibHTML/CSS/PropertyID.h>
 #include <LibHTML/CSS/StyleSheet.h>
 #include <LibHTML/Parser/CSSParser.h>
 #include <ctype.h>
@@ -48,55 +49,6 @@ NonnullRefPtr<StyleValue> parse_css_value(const StringView& view)
     return StringStyleValue::create(string);
 }
 
-static CSS::PropertyID parse_css_property_id(const StringView& string)
-{
-    static HashMap<String, CSS::PropertyID> map;
-    if (map.is_empty()) {
-        map.set("background-color", CSS::PropertyID::BackgroundColor);
-        map.set("border-bottom-style", CSS::PropertyID::BorderBottomStyle);
-        map.set("border-bottom-width", CSS::PropertyID::BorderBottomWidth);
-        map.set("border-collapse", CSS::PropertyID::BorderCollapse);
-        map.set("border-left-style", CSS::PropertyID::BorderLeftStyle);
-        map.set("border-left-width", CSS::PropertyID::BorderLeftWidth);
-        map.set("border-right-style", CSS::PropertyID::BorderRightStyle);
-        map.set("border-right-width", CSS::PropertyID::BorderRightWidth);
-        map.set("border-spacing", CSS::PropertyID::BorderSpacing);
-        map.set("border-top-style", CSS::PropertyID::BorderTopStyle);
-        map.set("border-top-width", CSS::PropertyID::BorderTopWidth);
-        map.set("color", CSS::PropertyID::Color);
-        map.set("display", CSS::PropertyID::Display);
-        map.set("font-family", CSS::PropertyID::FontFamily);
-        map.set("font-size", CSS::PropertyID::FontSize);
-        map.set("font-style", CSS::PropertyID::FontStyle);
-        map.set("font-variant", CSS::PropertyID::FontVariant);
-        map.set("font-weight", CSS::PropertyID::FontWeight);
-        map.set("height", CSS::PropertyID::Height);
-        map.set("letter-spacing", CSS::PropertyID::LetterSpacing);
-        map.set("line-height", CSS::PropertyID::LineHeight);
-        map.set("list-style", CSS::PropertyID::ListStyle);
-        map.set("list-style-image", CSS::PropertyID::ListStyleImage);
-        map.set("list-style-position", CSS::PropertyID::ListStylePosition);
-        map.set("list-style-type", CSS::PropertyID::ListStyleType);
-        map.set("margin-bottom", CSS::PropertyID::MarginBottom);
-        map.set("margin-left", CSS::PropertyID::MarginLeft);
-        map.set("margin-right", CSS::PropertyID::MarginRight);
-        map.set("margin-top", CSS::PropertyID::MarginTop);
-        map.set("padding-bottom", CSS::PropertyID::PaddingBottom);
-        map.set("padding-left", CSS::PropertyID::PaddingLeft);
-        map.set("padding-right", CSS::PropertyID::PaddingRight);
-        map.set("padding-top", CSS::PropertyID::PaddingTop);
-        map.set("text-align", CSS::PropertyID::TextAlign);
-        map.set("text-decoration", CSS::PropertyID::TextDecoration);
-        map.set("text-indent", CSS::PropertyID::TextIndent);
-        map.set("text-transform", CSS::PropertyID::TextTransform);
-        map.set("visibility", CSS::PropertyID::Visibility);
-        map.set("white-space", CSS::PropertyID::WhiteSpace);
-        map.set("width", CSS::PropertyID::Width);
-        map.set("word-spacing", CSS::PropertyID::WordSpacing);
-    }
-    return map.get(string).value_or(CSS::PropertyID::Invalid);
-}
-
 class CSSParser {
 public:
     CSSParser(const StringView& input)
@@ -331,7 +283,8 @@ public:
         if (peek() && peek() != '}')
             consume_specific(';');
 
-        return StyleProperty { parse_css_property_id(property_name), parse_css_value(property_value), is_important };
+        auto property_id = CSS::property_id_from_string(property_name);
+        return StyleProperty { property_id, parse_css_value(property_value), is_important };
     }
 
     void parse_declaration()