Initial support for choosing a theme by specifying a preferred style.

core/src/main/java/com/github/weisj/darklaf/DarkLaf.java

@@ -25,6 +25,7 @@ package com.github.weisj.darklaf;
 
 import com.github.weisj.darklaf.components.border.DarkBorders;
 import com.github.weisj.darklaf.platform.Decorations;
+import com.github.weisj.darklaf.theme.FontSizeRule;
 import com.github.weisj.darklaf.theme.Theme;
 import com.github.weisj.darklaf.ui.DarkPopupFactory;
 import com.github.weisj.darklaf.ui.popupmenu.DarkPopupMenuUI;
@@ -104,9 +105,10 @@ public class DarkLaf extends BasicLookAndFeel {
     public UIDefaults getDefaults() {
         final UIDefaults metalDefaults = new MetalLookAndFeel().getDefaults();
         final UIDefaults defaults = base.getDefaults();
+        final Theme currentTheme = LafManager.getTheme();
         try {
             initInputMapDefaults(defaults);
-            loadThemeDefaults(defaults);
+            loadThemeDefaults(currentTheme, defaults);
             setupUtils(defaults);
             initIdeaDefaults(defaults);
 
@@ -114,6 +116,7 @@ public class DarkLaf extends BasicLookAndFeel {
             if (SystemInfo.isMac) {
                 patchMacOSFonts(defaults);
             }
+            applyFontRule(currentTheme, defaults);
             setupDecorations();
 
             String key = DarkPopupMenuUI.KEY_DEFAULT_LIGHTWEIGHT_POPUPS;
@@ -132,6 +135,26 @@ public class DarkLaf extends BasicLookAndFeel {
         return defaults;
     }
 
+    private void applyFontRule(final Theme currentTheme, final UIDefaults defaults) {
+        FontSizeRule rule = currentTheme.getFontSizeRule();
+        if (rule == null || rule == FontSizeRule.DEFAULT) return;
+        for (Map.Entry<Object, Object> entry : defaults.entrySet()) {
+            if (entry != null && entry.getValue() instanceof Font) {
+                entry.setValue(fontWithRule((Font) entry.getValue(), currentTheme, rule, defaults));
+            }
+        }
+    }
+
+    private Font fontWithRule(final Font font, final Theme currentTheme,
+                              final FontSizeRule rule, final UIDefaults defaults) {
+        Font withRule = currentTheme.getFontMapper(rule).map(font, defaults);
+        if (font instanceof UIResource
+            && !(withRule instanceof UIResource)) {
+            withRule = new FontUIResource(withRule);
+        }
+        return withRule;
+    }
+
     private void setupUtils(final UIDefaults defaults) {
         DarkUIUtil.setDropOpacity(defaults.getInt("dropOpacity") / 100f);
         DarkUIUtil.setGlowOpacity(defaults.getInt("glowOpacity") / 100f);
@@ -222,9 +245,8 @@ public class DarkLaf extends BasicLookAndFeel {
         }
     }
 
-    private void loadThemeDefaults(final UIDefaults defaults) {
+    private void loadThemeDefaults(final Theme currentTheme, final UIDefaults defaults) {
         Properties uiProps = new Properties();
-        final Theme currentTheme = LafManager.getTheme();
         currentTheme.loadDefaults(uiProps, defaults);
         //Load overwrites the user has set.
         PropertyLoader.putProperties(LafManager.getUserProperties(), uiProps, defaults);
@@ -245,6 +267,8 @@ public class DarkLaf extends BasicLookAndFeel {
     }
 
     private void loadFontProperties(final Properties uiProps, final UIDefaults defaults) {
+        Properties fontSizeProps = PropertyLoader.loadProperties(DarkLaf.class, "font_sizes", "properties/");
+        PropertyLoader.putProperties(fontSizeProps, uiProps, defaults);
         Properties fontProps = PropertyLoader.loadProperties(DarkLaf.class, "font", "properties/");
         PropertyLoader.putProperties(fontProps, uiProps, defaults);
     }

core/src/main/java/com/github/weisj/darklaf/LafManager.java

@@ -25,9 +25,7 @@ package com.github.weisj.darklaf;
 
 import com.github.weisj.darklaf.icons.AwareIconStyle;
 import com.github.weisj.darklaf.icons.IconLoader;
-import com.github.weisj.darklaf.theme.DarculaTheme;
-import com.github.weisj.darklaf.theme.IntelliJTheme;
-import com.github.weisj.darklaf.theme.Theme;
+import com.github.weisj.darklaf.theme.*;
 
 import javax.swing.*;
 import java.awt.*;
@@ -46,6 +44,7 @@ import java.util.logging.Logger;
  */
 public final class LafManager {
 
+    private static ThemeProvider themeProvider;
     private static Theme theme;
     private static boolean logEnabled = false;
     private static boolean decorationsOverwrite = true;
@@ -91,7 +90,7 @@ public final class LafManager {
     }
 
     /**
-     * Set globally whether decorations are enabled. By default this is true. Decorations are used if this value is set
+     * Set globally whether decorations are enabled. By default, this is true. Decorations are used if this value is set
      * to true and the current platform and theme support custom decorations.
      *
      * @param enabled true if decorations should be used if available.
@@ -105,6 +104,29 @@ public final class LafManager {
         }
     }
 
+    public static ThemeProvider getThemeProvider() {
+        if (themeProvider == null) themeProvider = createDefaultThemeProvider();
+        return themeProvider;
+    }
+
+    public static void setThemeProvider(final ThemeProvider themeProvider) {
+        LafManager.themeProvider = themeProvider;
+    }
+
+    private static ThemeProvider createDefaultThemeProvider() {
+        return new DefaultThemeProvider();
+    }
+
+    /**
+     * Get the associated theme for the given preferred style.
+     *
+     * @param style the preferred theme style.
+     * @return the associated Theme or best match if there is none associated.
+     */
+    public static Theme themeForPreferredStyle(final PreferredThemeStyle style) {
+        return getThemeProvider().getTheme(style);
+    }
+
     /**
      * Get the current theme. This method will never return null even if the LaF isn#t currently installed.
      *
@@ -112,7 +134,7 @@ public final class LafManager {
      */
     public static Theme getTheme() {
         if (theme == null) {
-            setTheme(new IntelliJTheme());
+            setTheme(themeForPreferredStyle(null));
         }
         return theme;
     }
@@ -124,11 +146,30 @@ public final class LafManager {
      */
     public static void setTheme(final Theme theme) {
         LafManager.theme = theme;
-        IconLoader.updateAwareStyle(theme.isDark() ? AwareIconStyle.DARK
-                                                   : AwareIconStyle.LIGHT);
+        IconLoader.updateAwareStyle(Theme.isDark(theme) ? AwareIconStyle.DARK
+                                                        : AwareIconStyle.LIGHT);
         IconLoader.updateThemeStatus(theme);
     }
 
+    /**
+     * Install the theme suited for the given preferred theme style.
+     *
+     * @param preferredThemeStyle the preferred theme style.
+     */
+    public static void installTheme(final PreferredThemeStyle preferredThemeStyle) {
+        setTheme(preferredThemeStyle);
+        install();
+    }
+
+    /**
+     * Sets the theme suited for the given preferred theme style.
+     *
+     * @param preferredThemeStyle the preferred theme style.
+     */
+    public static void setTheme(final PreferredThemeStyle preferredThemeStyle) {
+        setTheme(themeForPreferredStyle(preferredThemeStyle));
+    }
+
 
     /**
      * Sets the current theme and installs the LaF. If the LaF is already installed the theme is switched. This behaves

core/src/main/java/com/github/weisj/darklaf/theme/ContrastRule.java

@@ -0,0 +1,29 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020 Jannis Weis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.github.weisj.darklaf.theme;
+
+public enum ContrastRule {
+    HIGH_CONTRAST,
+    STANDARD
+}

core/src/main/java/com/github/weisj/darklaf/theme/DarculaTheme.java

@@ -49,12 +49,12 @@ public class DarculaTheme extends Theme {
     }
 
     @Override
-    public boolean isDark() {
-        return true;
+    public StyleRule getStyleRule() {
+        return StyleRule.DARK;
     }
 
     @Override
-    protected IconTheme getPresetIconTheme() {
-        return IconTheme.DARK;
+    protected PresetIconRule getPresetIconRule() {
+        return PresetIconRule.DARK;
     }
 }

core/src/main/java/com/github/weisj/darklaf/theme/DefaultThemeProvider.java

@@ -0,0 +1,91 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020 Jannis Weis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.github.weisj.darklaf.theme;
+
+public class DefaultThemeProvider implements ThemeProvider {
+
+    private final Theme lightTheme;
+    private final Theme darkTheme;
+    private final Theme lightHighContrastTheme;
+    private final Theme darkHighContrastTheme;
+
+    public DefaultThemeProvider() {
+        this(new IntelliJTheme(), new DarculaTheme(),
+             new HighContrastLightTheme(), new HighContrastDarkTheme());
+    }
+
+    public DefaultThemeProvider(final Theme lightTheme,
+                                final Theme darkTheme,
+                                final Theme lightHighContrastTheme,
+                                final Theme darkHighContrastTheme) {
+        /*
+         * Ensure the given themes actually serve the purpose they are intended for.
+         */
+        if (Theme.isDark(lightTheme)) {
+            throw new UnsupportedThemeException("Given light theme " + lightTheme
+                                                + "is declared as dark");
+        }
+        if (Theme.isDark(lightHighContrastTheme)) {
+            throw new UnsupportedThemeException("Given light high-contrast theme " + lightHighContrastTheme
+                                                + " is declared as dark");
+        }
+        if (!Theme.isDark(darkTheme)) {
+            throw new UnsupportedThemeException("Given dark theme " + darkTheme
+                                                + "is not declared as dark");
+        }
+        if (!Theme.isDark(darkHighContrastTheme)) {
+            throw new UnsupportedThemeException("Given dark high-contrast theme " + darkTheme
+                                                + "is not declared as dark");
+        }
+        /*
+         * A high contrast theme may serve as a standard theme, but a standard theme should never be used
+         * for high contrast themes.
+         */
+        if (!Theme.isHighContrast(lightHighContrastTheme)) {
+            throw new UnsupportedThemeException("Given light high-contrast theme " + lightHighContrastTheme
+                                                + " is not declared as high-contrast");
+        }
+        if (!Theme.isHighContrast(darkHighContrastTheme)) {
+            throw new UnsupportedThemeException("Given dark high-contrast theme " + darkHighContrastTheme
+                                                + " is not declared as high-contrast");
+        }
+        this.lightTheme = lightTheme;
+        this.darkTheme = darkTheme;
+        this.lightHighContrastTheme = lightHighContrastTheme;
+        this.darkHighContrastTheme = darkHighContrastTheme;
+    }
+
+
+    @Override
+    public Theme getTheme(final PreferredThemeStyle themeStyle) {
+        if (themeStyle == null) return lightTheme;
+        boolean dark = themeStyle.getStyleRule() == StyleRule.DARK;
+        boolean highContrast = themeStyle.getContrastRule() == ContrastRule.HIGH_CONTRAST;
+        Theme theme = dark ? highContrast ? darkHighContrastTheme : darkTheme
+                           : highContrast ? lightHighContrastTheme : lightTheme;
+        // Apply the font size.
+        theme.setFontSizeRule(themeStyle.getFontSizeRule());
+        return theme;
+    }
+}

core/src/main/java/com/github/weisj/darklaf/theme/FontMapper.java

@@ -0,0 +1,32 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020 Jannis Weis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.github.weisj.darklaf.theme;
+
+import javax.swing.*;
+import java.awt.*;
+
+public interface FontMapper {
+
+    Font map(final Font font, final UIDefaults defaults);
+}

core/src/main/java/com/github/weisj/darklaf/theme/FontSizeRule.java

@@ -0,0 +1,51 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020 Jannis Weis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.github.weisj.darklaf.theme;
+
+public enum FontSizeRule {
+    DEFAULT("default"),
+    TINY("tiny"),
+    SMALLER("smaller"),
+    SMALL("small"),
+    MEDIUM("medium"),
+    LARGE("large"),
+    LARGER("larger"),
+    HUGE("huge");
+
+    private final String propertyKey;
+    private final PropertyFontMapper fontMapper;
+
+    FontSizeRule(final String propertyKey) {
+        this.propertyKey = propertyKey;
+        fontMapper = new PropertyFontMapper(getPropertyKey());
+    }
+
+    public String getPropertyKey() {
+        return "fontSize." + propertyKey;
+    }
+
+    public FontMapper getFontMapper() {
+        return fontMapper;
+    }
+}

core/src/main/java/com/github/weisj/darklaf/theme/HighContrastDarkTheme.java

@@ -29,8 +29,8 @@ import java.util.Properties;
 public class HighContrastDarkTheme extends Theme {
 
     @Override
-    protected IconTheme getPresetIconTheme() {
-        return IconTheme.NONE;
+    protected PresetIconRule getPresetIconRule() {
+        return PresetIconRule.NONE;
     }
 
     @Override
@@ -54,13 +54,13 @@ public class HighContrastDarkTheme extends Theme {
     }
 
     @Override
-    public boolean isDark() {
-        return true;
+    public StyleRule getStyleRule() {
+        return StyleRule.DARK;
     }
 
     @Override
-    public boolean isHighContrast() {
-        return true;
+    public ContrastRule getContrastRule() {
+        return ContrastRule.HIGH_CONTRAST;
     }
 
     @Override

core/src/main/java/com/github/weisj/darklaf/theme/HighContrastLightTheme.java

@@ -29,8 +29,8 @@ import java.util.Properties;
 public class HighContrastLightTheme extends Theme {
 
     @Override
-    protected IconTheme getPresetIconTheme() {
-        return IconTheme.LIGHT;
+    protected PresetIconRule getPresetIconRule() {
+        return PresetIconRule.LIGHT;
     }
 
     @Override
@@ -54,13 +54,13 @@ public class HighContrastLightTheme extends Theme {
     }
 
     @Override
-    public boolean isDark() {
-        return false;
+    public StyleRule getStyleRule() {
+        return StyleRule.LIGHT;
     }
 
     @Override
-    public boolean isHighContrast() {
-        return true;
+    public ContrastRule getContrastRule() {
+        return ContrastRule.HIGH_CONTRAST;
     }
 
     @Override

core/src/main/java/com/github/weisj/darklaf/theme/IntelliJTheme.java

@@ -37,13 +37,8 @@ public class IntelliJTheme extends Theme {
     }
 
     @Override
-    public boolean isDark() {
-        return false;
-    }
-
-    @Override
-    protected IconTheme getPresetIconTheme() {
-        return IconTheme.LIGHT;
+    protected PresetIconRule getPresetIconRule() {
+        return PresetIconRule.LIGHT;
     }
 
     @Override
@@ -61,6 +56,11 @@ public class IntelliJTheme extends Theme {
         return IntelliJTheme.class;
     }
 
+    @Override
+    public StyleRule getStyleRule() {
+        return StyleRule.LIGHT;
+    }
+
     @Override
     public void loadUIProperties(final Properties properties, final UIDefaults currentDefaults) {
         super.loadUIProperties(properties, currentDefaults);

core/src/main/java/com/github/weisj/darklaf/theme/PreferredThemeStyle.java

@@ -0,0 +1,55 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020 Jannis Weis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.github.weisj.darklaf.theme;
+
+public class PreferredThemeStyle {
+
+    private final ContrastRule contrastRule;
+    private final StyleRule styleRule;
+    private final FontSizeRule fontSizeRule;
+
+    public PreferredThemeStyle(final ContrastRule contrastRule,
+                               final StyleRule styleRule,
+                               final FontSizeRule fontSizeRule) {
+        if (contrastRule == null) throw new IllegalArgumentException("null is not a valid contrast rule");
+        if (styleRule == null) throw new IllegalArgumentException("null is not a valid style rule");
+        if (fontSizeRule == null) throw new IllegalArgumentException("null is not a valid font size rule");
+        this.contrastRule = contrastRule;
+        this.styleRule = styleRule;
+        this.fontSizeRule = fontSizeRule;
+    }
+
+    public ContrastRule getContrastRule() {
+        return contrastRule;
+    }
+
+    public StyleRule getStyleRule() {
+        return styleRule;
+    }
+
+    public FontSizeRule getFontSizeRule() {
+        return fontSizeRule;
+    }
+
+}

core/src/main/java/com/github/weisj/darklaf/theme/PresetIconRule.java

@@ -0,0 +1,30 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020 Jannis Weis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.github.weisj.darklaf.theme;
+
+public enum PresetIconRule {
+    NONE,
+    DARK,
+    LIGHT
+}

core/src/main/java/com/github/weisj/darklaf/theme/PropertyFontMapper.java

@@ -0,0 +1,71 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020 Jannis Weis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.github.weisj.darklaf.theme;
+
+import com.github.weisj.darklaf.LafManager;
+
+import javax.swing.*;
+import java.awt.*;
+import java.util.logging.Logger;
+
+public class PropertyFontMapper implements FontMapper {
+
+    private static final Logger LOGGER = Logger.getLogger(PropertyFontMapper.class.getName());
+
+    private Theme lastTheme = null;
+    private int adjustment;
+    private String propertyKey;
+
+    public PropertyFontMapper(final String propertyKey) {
+        this.propertyKey = propertyKey;
+    }
+
+    @Override
+    public Font map(final Font font, final UIDefaults defaults) {
+        adjustment = getSize(defaults);
+        // No need to create a new font.
+        if (adjustment == 0) return font;
+        if (adjustment < font.getSize2D()) {
+            if (adjustment != Integer.MIN_VALUE) {
+                LOGGER.warning("Font " + font + " would be invisible after applying "
+                               + "an adjustment of " + adjustment + ". Aborting!");
+            }
+            return font;
+        }
+        return font.deriveFont(font.getSize2D() + adjustment);
+    }
+
+    private int getSize(final UIDefaults defaults) {
+        // Use cached value if already queried.
+        if (lastTheme == LafManager.getTheme()) return adjustment;
+        lastTheme = LafManager.getTheme();
+        Object obj = defaults.get(propertyKey);
+        if (!(obj instanceof Integer)) {
+            LOGGER.warning("Font size property '" + propertyKey + "' not specified. Mapper will do nothing");
+            return Integer.MIN_VALUE;
+        } else {
+            return (int) obj;
+        }
+    }
+}

core/src/main/java/com/github/weisj/darklaf/theme/SolarizedDarkTheme.java

@@ -49,8 +49,8 @@ public class SolarizedDarkTheme extends Theme {
     }
 
     @Override
-    public boolean isDark() {
-        return true;
+    public StyleRule getStyleRule() {
+        return StyleRule.DARK;
     }
 
     @Override
@@ -60,7 +60,7 @@ public class SolarizedDarkTheme extends Theme {
     }
 
     @Override
-    protected IconTheme getPresetIconTheme() {
-        return IconTheme.NONE;
+    protected PresetIconRule getPresetIconRule() {
+        return PresetIconRule.NONE;
     }
 }

core/src/main/java/com/github/weisj/darklaf/theme/SolarizedLightTheme.java

@@ -49,18 +49,18 @@ public class SolarizedLightTheme extends Theme {
     }
 
     @Override
-    public void loadUIProperties(final Properties properties, final UIDefaults currentDefaults) {
-        super.loadUIProperties(properties, currentDefaults);
-        loadCustomProperties("ui", properties, currentDefaults);
+    public StyleRule getStyleRule() {
+        return StyleRule.LIGHT;
     }
 
     @Override
-    public boolean isDark() {
-        return false;
+    public void loadUIProperties(final Properties properties, final UIDefaults currentDefaults) {
+        super.loadUIProperties(properties, currentDefaults);
+        loadCustomProperties("ui", properties, currentDefaults);
     }
 
     @Override
-    protected IconTheme getPresetIconTheme() {
-        return IconTheme.NONE;
+    protected PresetIconRule getPresetIconRule() {
+        return PresetIconRule.NONE;
     }
 }

core/src/main/java/com/github/weisj/darklaf/theme/StyleRule.java

@@ -0,0 +1,29 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020 Jannis Weis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.github.weisj.darklaf.theme;
+
+public enum StyleRule {
+    DARK,
+    LIGHT
+}

core/src/main/java/com/github/weisj/darklaf/theme/Theme.java

@@ -57,6 +57,30 @@ public abstract class Theme {
     private static final String[] ICON_PROPERTIES = new String[]{
         "control", "dialog", "files", "frame", "indicator", "menu", "misc", "navigation"
     };
+    private FontSizeRule fontSizeRule;
+
+
+    /**
+     * Returns whether the theme is a dark theme. This is used to determine the default mode for [aware] icons.
+     *
+     * @param theme the theme.
+     * @return true if dark.
+     */
+    public static boolean isDark(final Theme theme) {
+        if (theme == null) return false;
+        return theme.getStyleRule() == StyleRule.DARK;
+    }
+
+    /**
+     * Returns whether the theme is a high contrast theme.
+     *
+     * @param theme the theme.
+     * @return true if the theme is a high contrast theme.
+     */
+    public static boolean isHighContrast(final Theme theme) {
+        if (theme == null) return false;
+        return theme.getContrastRule() == ContrastRule.HIGH_CONTRAST;
+    }
 
     public UIManager.LookAndFeelInfo createLookAndFeelInfo() {
         return new UIManager.LookAndFeelInfo(getPrefix(), DarkLaf.class.getCanonicalName());
@@ -130,7 +154,7 @@ public abstract class Theme {
      * @param currentDefaults the current ui defaults.
      */
     protected void loadIconTheme(final Properties properties, final UIDefaults currentDefaults) {
-        IconTheme iconTheme = getPresetIconTheme();
+        PresetIconRule iconTheme = getPresetIconRule();
         Properties props;
         switch (iconTheme) {
             case DARK:
@@ -185,7 +209,7 @@ public abstract class Theme {
      *
      * @return the icon theme.
      */
-    protected abstract IconTheme getPresetIconTheme();
+    protected abstract PresetIconRule getPresetIconRule();
 
     /**
      * Load custom properties that are located under {@link #getResourcePath()}, with the name {@link
@@ -310,24 +334,50 @@ public abstract class Theme {
     }
 
     /**
-     * Returns whether this theme is a dark theme. This is used to determine the default mode for [aware] icons.
+     * Returns the style rule for this theme.
      *
-     * @return true if the theme is dark.
+     * @return the style rule.
      */
-    public abstract boolean isDark();
+    public abstract StyleRule getStyleRule();
 
     /**
-     * Returns whether the theme is a high contrast theme.
+     * Returns contrast rule for the theme.
      *
-     * @return true if the theme is high contrast.
+     * @return the contrast rule.
      */
-    public boolean isHighContrast() {
-        return false;
+    public ContrastRule getContrastRule() {
+        return ContrastRule.STANDARD;
     }
 
-    protected enum IconTheme {
-        NONE,
-        DARK,
-        LIGHT
+    /**
+     * Get the font size rule for this theme.
+     *
+     * @return the font size rule.
+     */
+    public FontSizeRule getFontSizeRule() {
+        if (fontSizeRule == null) fontSizeRule = FontSizeRule.DEFAULT;
+        return fontSizeRule;
+    }
+
+    /**
+     * Set the font size rule.
+     *
+     * @param fontSizeRule the font size rule.
+     */
+    public void setFontSizeRule(final FontSizeRule fontSizeRule) {
+        this.fontSizeRule = fontSizeRule;
     }
+
+    /**
+     * Get the font mapper for the specified size rule. By default, this delegated to the values specified by the
+     * `[rule].size` properties.
+     *
+     * @param rule the font size rule.
+     * @return the associated font mapper.
+     */
+    public FontMapper getFontMapper(final FontSizeRule rule) {
+        if (rule == null) return (font, defaults) -> font;
+        return rule.getFontMapper();
+    }
+
 }

core/src/main/java/com/github/weisj/darklaf/theme/ThemeProvider.java

@@ -0,0 +1,29 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020 Jannis Weis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.github.weisj.darklaf.theme;
+
+public interface ThemeProvider {
+
+    Theme getTheme(final PreferredThemeStyle themeStyle);
+}

core/src/main/resources/com/github/weisj/darklaf/properties/font.properties

@@ -22,45 +22,45 @@
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
 #
-Button.font                         = withSize(12)withStyle(0)
-CheckBox.font                       = withSize(12)withStyle(0)
-CheckBoxMenuItem.font               = withSize(12)withStyle(0)
-ColorChooser.font                   = withSize(12)withStyle(0)
-ComboBox.font                       = withSize(12)withStyle(0)
-DesktopIcon.font                    = withSize(12)withStyle(0)
-EditorPane.font                     = withSize(12)withStyle(0)
-FormattedTextField.font             = withSize(12)withStyle(0)
-IconButton.font                     = withSize(12)withStyle(0)
-Label.font                          = withSize(12)withStyle(0)
-List.font                           = withSize(12)withStyle(0)
-Menu.font                           = withSize(12)withStyle(0)
-MenuBar.font                        = withSize(12)withStyle(0)
-MenuItem.font                       = withSize(12)withStyle(0)
-OptionPane.font                     = withSize(12)withStyle(0)
-Panel.font                          = withSize(12)withStyle(0)
-PasswordField.font                  = withSize(12)withStyle(0)
-PopupMenu.font                      = withSize(12)withStyle(0)
-ProgressBar.font                    = withSize(12)withStyle(0)
-RadioButton.font                    = withSize(12)withStyle(0)
-RadioButtonMenuItem.font            = withSize(12)withStyle(0)
-ScrollPane.font                     = withSize(12)withStyle(0)
-Slider.font                         = withSize(12)withStyle(0)
-Spinner.font                        = withSize(12)withStyle(0)
-TabbedPane.font                     = withSize(12)withStyle(0)
-TabFrameTab.font                    = from(Label.font)withSize(11)withStyle(0)
-Table.font                          = withSize(12)withStyle(0)
-TableHeader.font                    = withSize(12)withStyle(0)
-TextArea.font                       = withSize(12)withStyle(0)
-TextField.font                      = withSize(12)withStyle(0)
-TextPane.font                       = withSize(12)withStyle(0)
-TitledBorder.font                   = withSize(12)withStyle(0)
-ToggleButton.font                   = withSize(12)withStyle(0)
-ToolBar.font                        = withSize(12)withStyle(0)
-ToolTip.font                        = withSize(12)withStyle(0)
-Tree.font                           = withSize(12)withStyle(0)
-Viewport.font                       = withSize(12)withStyle(0)
-MenuItem.acceleratorFont            = withSize(10)withStyle(0)
-RadioButtonMenuItem.acceleratorFont = withSize(10)withStyle(0)
-Menu.acceleratorFont                = withSize(10)withStyle(0)
-CheckBoxMenuItem.acceleratorFont    = withSize(10)withStyle(0)
-InternalFrame.titleFont             = withSize(11)withStyle(0)
+Button.font                         = withSize(%fontSize.default)withStyle(0)
+CheckBox.font                       = withSize(%fontSize.default)withStyle(0)
+CheckBoxMenuItem.font               = withSize(%fontSize.default)withStyle(0)
+ColorChooser.font                   = withSize(%fontSize.default)withStyle(0)
+ComboBox.font                       = withSize(%fontSize.default)withStyle(0)
+DesktopIcon.font                    = withSize(%fontSize.default)withStyle(0)
+EditorPane.font                     = withSize(%fontSize.default)withStyle(0)
+FormattedTextField.font             = withSize(%fontSize.default)withStyle(0)
+IconButton.font                     = withSize(%fontSize.default)withStyle(0)
+Label.font                          = withSize(%fontSize.default)withStyle(0)
+List.font                           = withSize(%fontSize.default)withStyle(0)
+Menu.font                           = withSize(%fontSize.default)withStyle(0)
+MenuBar.font                        = withSize(%fontSize.default)withStyle(0)
+MenuItem.font                       = withSize(%fontSize.default)withStyle(0)
+OptionPane.font                     = withSize(%fontSize.default)withStyle(0)
+Panel.font                          = withSize(%fontSize.default)withStyle(0)
+PasswordField.font                  = withSize(%fontSize.default)withStyle(0)
+PopupMenu.font                      = withSize(%fontSize.default)withStyle(0)
+ProgressBar.font                    = withSize(%fontSize.default)withStyle(0)
+RadioButton.font                    = withSize(%fontSize.default)withStyle(0)
+RadioButtonMenuItem.font            = withSize(%fontSize.default)withStyle(0)
+ScrollPane.font                     = withSize(%fontSize.default)withStyle(0)
+Slider.font                         = withSize(%fontSize.default)withStyle(0)
+Spinner.font                        = withSize(%fontSize.default)withStyle(0)
+TabbedPane.font                     = withSize(%fontSize.default)withStyle(0)
+TabFrameTab.font                    = from(Label.font)withSize(%fontSize.default,-1)withStyle(0)
+Table.font                          = withSize(%fontSize.default)withStyle(0)
+TableHeader.font                    = withSize(%fontSize.default)withStyle(0)
+TextArea.font                       = withSize(%fontSize.default)withStyle(0)
+TextField.font                      = withSize(%fontSize.default)withStyle(0)
+TextPane.font                       = withSize(%fontSize.default)withStyle(0)
+TitledBorder.font                   = withSize(%fontSize.default)withStyle(0)
+ToggleButton.font                   = withSize(%fontSize.default)withStyle(0)
+ToolBar.font                        = withSize(%fontSize.default)withStyle(0)
+ToolTip.font                        = withSize(%fontSize.default)withStyle(0)
+Tree.font                           = withSize(%fontSize.default)withStyle(0)
+Viewport.font                       = withSize(%fontSize.default)withStyle(0)
+MenuItem.acceleratorFont            = withSize(%fontSize.default,-2)withStyle(0)
+RadioButtonMenuItem.acceleratorFont = withSize(%fontSize.default,-2)withStyle(0)
+Menu.acceleratorFont                = withSize(%fontSize.default,-2)withStyle(0)
+CheckBoxMenuItem.acceleratorFont    = withSize(%fontSize.default,-2)withStyle(0)
+InternalFrame.titleFont             = withSize(%fontSize.default,-1)withStyle(0)

core/src/main/resources/com/github/weisj/darklaf/properties/font_sizes.properties

@@ -0,0 +1,35 @@
+# suppress inspection "UnusedProperty" for whole file
+#
+# MIT License
+#
+# Copyright (c) 2020 Jannis Weis
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+#
+# The default font size to use.
+fontSize.default = 12
+
+# The following values are all relative to the default font size (or those specified on 'font.properties')
+fontSize.tiny    = -6
+fontSize.smaller = -4
+fontSize.small   = -2
+fontSize.medium  = 0
+fontSize.large   = 4
+fontSize.larger  = 8
+fontSize.huge    = 12

core/src/test/java/theme/MyCustomTheme.java

@@ -23,6 +23,8 @@
  */
 package theme;
 
+import com.github.weisj.darklaf.theme.PresetIconRule;
+import com.github.weisj.darklaf.theme.StyleRule;
 import com.github.weisj.darklaf.theme.Theme;
 import com.github.weisj.darklaf.util.SystemInfo;
 
@@ -60,12 +62,12 @@ public class MyCustomTheme extends Theme {
     }
 
     @Override
-    protected IconTheme getPresetIconTheme() {
+    protected PresetIconRule getPresetIconRule() {
         /*
          * Use a custom icon theme. Colors are defined in
          * my_custom_theme_icons.properties.
          */
-        return IconTheme.NONE;
+        return PresetIconRule.NONE;
     }
 
     @Override
@@ -84,7 +86,8 @@ public class MyCustomTheme extends Theme {
     }
 
     @Override
-    public boolean isDark() {
-        return false;
+    public StyleRule getStyleRule() {
+        return StyleRule.LIGHT;
     }
+
 }

property-loader/src/main/java/com/github/weisj/darklaf/PropertyLoader.java

@@ -158,19 +158,7 @@ public final class PropertyLoader {
         } else if (PropertyValue.NULL.equalsIgnoreCase(value)) {
             returnVal = null;
         } else if (value.startsWith(String.valueOf(REFERENCE_PREFIX))) {
-            String val = parseKey(value);
-            String referenceFreeKey = val.substring(1);
-            boolean containsKey = accumulator.containsKey(val)
-                                  || (addReferenceInfo && accumulator.containsKey(referenceFreeKey));
-            if (!containsKey) {
-                LOGGER.warning("Could not reference value '" + val + "' while loading '" + key + "'. " +
-                               "May be a forward reference");
-            }
-            returnVal = accumulator.get(val);
-            if (addReferenceInfo) {
-                if (returnVal == null) returnVal = accumulator.get(referenceFreeKey);
-                returnVal = new Pair<>(value, returnVal);
-            }
+            returnVal = parseReference(key, value, accumulator);
         }
         if (returnVal instanceof LoadError) {
             final Color color = ColorUtil.fromHex(value, null);
@@ -191,6 +179,24 @@ public final class PropertyLoader {
         return value;
     }
 
+    private static Object parseReference(final String key, final String value,
+                                         final Map<Object, Object> accumulator) {
+        String val = parseKey(value);
+        String referenceFreeKey = val.substring(1);
+        boolean containsKey = accumulator.containsKey(val)
+                              || (addReferenceInfo && accumulator.containsKey(referenceFreeKey));
+        if (!containsKey) {
+            LOGGER.warning("Could not reference value '" + val + "' while loading '" + key + "'. " +
+                           "Maybe is a forward reference");
+        }
+        Object returnVal = accumulator.get(val);
+        if (addReferenceInfo) {
+            if (returnVal == null) returnVal = accumulator.get(referenceFreeKey);
+            returnVal = new Pair<>(value, returnVal);
+        }
+        return returnVal;
+    }
+
 
     private static Object parseInsets(final String value) {
         final List<String> numbers = StringUtil.split(value, String.valueOf(SEPARATOR));
@@ -214,11 +220,11 @@ public final class PropertyLoader {
                 base = result.getFirst();
                 val = result.getSecond();
             } else if (val.startsWith(FONT_SIZE)) {
-                Pair<Integer, String> result = parseFontAttribute(FONT_SIZE, val);
+                Pair<Integer, String> result = parseFontAttribute(FONT_SIZE, val, accumulator);
                 size = result.getFirst();
                 val = result.getSecond();
             } else if (val.startsWith(FONT_STYLE)) {
-                Pair<Integer, String> result = parseFontAttribute(FONT_STYLE, val);
+                Pair<Integer, String> result = parseFontAttribute(FONT_STYLE, val, accumulator);
                 style = result.getFirst();
                 val = result.getSecond();
             } else {
@@ -243,16 +249,31 @@ public final class PropertyLoader {
         }
     }
 
-    private static Pair<Integer, String> parseFontAttribute(final String identifier, final String val) {
+    private static Pair<Integer, String> parseFontAttribute(final String identifier, final String val,
+                                                            final Map<Object, Object> accumulator) {
         String key = val.substring(identifier.length() + 1);
         int lastIndex = key.indexOf(ARG_END);
         String rest = key.substring(lastIndex + 1);
         key = key.substring(0, lastIndex);
-        try {
-            return new Pair<>(Integer.parseInt(key), rest);
-        } catch (NumberFormatException e) {
-            return new Pair<>(-1, rest);
+        String[] subKeys = key.split(String.valueOf(SEPARATOR));
+        int[] values = new int[subKeys.length];
+        for (int i = 0; i < values.length; i++) {
+            if (subKeys[i].startsWith(String.valueOf(REFERENCE_PREFIX))) {
+                Object ref = parseReference(identifier, subKeys[i], accumulator);
+                values[i] = ref instanceof Integer ? (Integer) ref : 0;
+            } else {
+                try {
+                    values[i] = Integer.parseInt(subKeys[i]);
+                } catch (NumberFormatException ignored) {
+                    // In this case the value will be 0.
+                }
+            }
+        }
+        int result = 0;
+        for (int i : values) {
+            result += i;
         }
+        return new Pair<>(result, rest);
     }
 
     private static Pair<Font, String> parseFrom(final String val,