LibWeb: Parse and propagate white-space-collapse CSS property

Author: https://github.com/Calme1709
Commit: ea30356fba
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/4832
Reviewed-by: https://github.com/AtkinsSJ
Reviewed-by: https://github.com/gmta ✅

Libraries/LibWeb/CSS/ComputedProperties.cpp

@@ -830,6 +830,12 @@ WhiteSpace ComputedProperties::white_space() const
     return keyword_to_white_space(value.to_keyword()).release_value();
 }
 
+WhiteSpaceCollapse ComputedProperties::white_space_collapse() const
+{
+    auto const& value = property(PropertyID::WhiteSpaceCollapse);
+    return keyword_to_white_space_collapse(value.to_keyword()).release_value();
+}
+
 Optional<LengthOrCalculated> ComputedProperties::letter_spacing() const
 {
     auto const& value = property(PropertyID::LetterSpacing);

Libraries/LibWeb/CSS/ComputedProperties.h

@@ -101,6 +101,7 @@ public:
     Vector<CursorData> cursor() const;
     Variant<LengthOrCalculated, NumberOrCalculated> tab_size() const;
     WhiteSpace white_space() const;
+    WhiteSpaceCollapse white_space_collapse() const;
     WordBreak word_break() const;
     Optional<LengthOrCalculated> word_spacing() const;
     Optional<LengthOrCalculated> letter_spacing() const;

Libraries/LibWeb/CSS/ComputedValues.h

@@ -101,6 +101,7 @@ public:
     static CSS::ContentVisibility content_visibility() { return CSS::ContentVisibility::Visible; }
     static CursorData cursor() { return { CSS::Cursor::Auto }; }
     static CSS::WhiteSpace white_space() { return CSS::WhiteSpace::Normal; }
+    static CSS::WhiteSpaceCollapse white_space_collapse() { return CSS::WhiteSpaceCollapse::Collapse; }
     static CSS::WordBreak word_break() { return CSS::WordBreak::Normal; }
     static CSS::LengthOrCalculated word_spacing() { return CSS::Length::make_px(0); }
     static LengthOrCalculated letter_spacing() { return CSS::Length::make_px(0); }
@@ -423,6 +424,7 @@ public:
     Vector<ShadowData> const& text_shadow() const { return m_inherited.text_shadow; }
     CSS::Positioning position() const { return m_noninherited.position; }
     CSS::WhiteSpace white_space() const { return m_inherited.white_space; }
+    CSS::WhiteSpaceCollapse white_space_collapse() const { return m_inherited.white_space_collapse; }
     CSS::LengthOrCalculated word_spacing() const { return m_inherited.word_spacing; }
     LengthOrCalculated letter_spacing() const { return m_inherited.letter_spacing; }
     CSS::FlexDirection flex_direction() const { return m_noninherited.flex_direction; }
@@ -616,6 +618,7 @@ protected:
         CSS::TextTransform text_transform { InitialValues::text_transform() };
         CSS::LengthPercentage text_indent { InitialValues::text_indent() };
         CSS::WhiteSpace white_space { InitialValues::white_space() };
+        CSS::WhiteSpaceCollapse white_space_collapse { InitialValues::white_space_collapse() };
         CSS::WordBreak word_break { InitialValues::word_break() };
         CSS::LengthOrCalculated word_spacing { InitialValues::word_spacing() };
         LengthOrCalculated letter_spacing { InitialValues::letter_spacing() };
@@ -819,6 +822,7 @@ public:
     void set_webkit_text_fill_color(Color value) { m_inherited.webkit_text_fill_color = value; }
     void set_position(CSS::Positioning position) { m_noninherited.position = position; }
     void set_white_space(CSS::WhiteSpace value) { m_inherited.white_space = value; }
+    void set_white_space_collapse(CSS::WhiteSpaceCollapse value) { m_inherited.white_space_collapse = value; }
     void set_word_spacing(CSS::LengthOrCalculated value) { m_inherited.word_spacing = move(value); }
     void set_word_break(CSS::WordBreak value) { m_inherited.word_break = value; }
     void set_letter_spacing(CSS::LengthOrCalculated value) { m_inherited.letter_spacing = value; }

Libraries/LibWeb/CSS/Enums.json

@@ -676,6 +676,14 @@
     "pre-line",
     "pre-wrap"
   ],
+  "white-space-collapse": [
+    "collapse",
+    "discard",
+    "preserve",
+    "preserve-breaks",
+    "preserve-spaces",
+    "break-spaces"
+  ],
   "word-break": [
     "normal",
     "keep-all",

Libraries/LibWeb/CSS/Keywords.json

@@ -102,6 +102,7 @@
   "both-edges",
   "bottom",
   "break-all",
+  "break-spaces",
   "break-word",
   "browser",
   "butt",
@@ -157,6 +158,7 @@
   "diagonal-fractions",
   "difference",
   "disc",
+  "discard",
   "disclosure-closed",
   "disclosure-open",
   "discretionary-ligatures",
@@ -376,6 +378,9 @@
   "pre",
   "pre-line",
   "pre-wrap",
+  "preserve",
+  "preserve-breaks",
+  "preserve-spaces",
   "progress",
   "progress-bar",
   "progressive",

Libraries/LibWeb/CSS/Properties.json

@@ -3126,6 +3126,14 @@
       "white-space"
     ]
   },
+  "white-space-collapse": {
+    "animation-type": "discrete",
+    "inherited": true,
+    "initial": "collapse",
+    "valid-types": [
+      "white-space-collapse"
+    ]
+  },
   "width": {
     "animation-type": "by-computed-value",
     "inherited": false,