WIP: Ligature support. Selections ending mid-ligature is a problem

RSyntaxTextArea/src/main/java/org/fife/ui/rsyntaxtextarea/DefaultTokenPainter.java

@@ -14,6 +14,7 @@
 import java.awt.geom.Rectangle2D;
 
 import javax.swing.text.TabExpander;
+import javax.swing.text.Utilities;
 
 
 /**
@@ -43,6 +44,34 @@ public class DefaultTokenPainter implements TokenPainter {
 	}
 
 
+	@Override
+	public float nextX(Token token, int charCount, float x,
+							RSyntaxTextArea host, TabExpander e) {
+
+		int textOffs = token.getTextOffset();
+		char[] text = token.getTextArray();
+		int end = textOffs + charCount;
+		int flushLen = 0;
+		int flushIndex = textOffs;
+		FontMetrics fm = host.getFontMetricsForTokenType(token.getType());
+
+		for (int i=textOffs; i<end; i++) {
+            if (text[i] == '\t') {
+                x = e.nextTabStop(
+                        x + fm.charsWidth(text, flushIndex, flushLen), 0);
+                flushLen = 0;
+                flushIndex = i + 1;
+            }
+            else {
+                flushLen++;
+            }
+		}
+
+		return x + fm.charsWidth(text, flushIndex, flushLen);
+
+	}
+
+
 	@Override
 	public final float paint(Token token, Graphics2D g, float x, float y,
 						RSyntaxTextArea host, TabExpander e) {

RSyntaxTextArea/src/main/java/org/fife/ui/rsyntaxtextarea/SyntaxScheme.java

@@ -12,9 +12,11 @@
 import java.awt.Color;
 import java.awt.Font;
 import java.awt.Graphics2D;
+import java.awt.font.TextAttribute;
 import java.io.IOException;
 import java.io.InputStream;
 import java.lang.reflect.Field;
+import java.util.Map;
 
 import javax.swing.text.StyleContext;
 
@@ -106,8 +108,8 @@ void changeBaseFont(Font old, Font font) {
 				if (style.font.getFamily().equals(old.getFamily()) &&
 					style.font.getSize() == old.getSize()) {
 					int s = style.font.getStyle(); // Keep bold or italic
-					StyleContext sc = StyleContext.getDefaultStyleContext();
-					style.font = sc.getFont(font.getFamily(), s, font.getSize());
+					style.font = getFont(font.getFamily(), s, font.getSize(),
+						font.getAttributes());
 				}
 			}
 		}
@@ -174,6 +176,29 @@ else if (!styles[i].equals(otherSchemes[i])) {
 	}
 
 
+	/**
+	 * Returns the specified font.
+	 *
+	 * @param family The font family.
+	 * @param style The style of font.
+	 * @param size The size of the font.
+	 * @param attrs Optional text attributes.
+	 * @return The font.
+	 */
+	private static Font getFont(String family, int style, int size,
+								Map<TextAttribute, ?> attrs) {
+		// Use StyleContext to get a composite font for Asian glyphs.
+		// WORKAROUND for Sun JRE bug 6282887 (Asian font bug in 1.4/1.5)
+		// That bug seems to be hidden now, see 6289072 instead.
+		StyleContext sc = StyleContext.getDefaultStyleContext();
+		Font font = sc.getFont(family, style, size);
+		if (attrs != null) {
+			font = font.deriveFont(attrs);
+		}
+		return font;
+	}
+
+
 	/**
 	 * Returns a hex string representing an RGB color, of the form
 	 * <code>"$rrggbb"</code>.
@@ -328,10 +353,6 @@ public static SyntaxScheme loadFromString(String string,
 						tokenCount + ", found " + tokens.length);
 				}
 
-				// Use StyleContext to create fonts to get composite fonts for
-				// Asian glyphs.
-				StyleContext sc = StyleContext.getDefaultStyleContext();
-
 				// Loop through each token style.  Format:
 				// "index,(fg|-),(bg|-),(t|f),((font,style,size)|(-,,))"
 				for (int i=0; i<tokenTypeCount; i++) {
@@ -365,9 +386,10 @@ public static SyntaxScheme loadFromString(String string,
 					Font font = null;
 					String family = tokens[pos+4];
 					if (!"-".equals(family)) {
-						font = sc.getFont(family,
+						font = getFont(family,
 							Integer.parseInt(tokens[pos+5]),	// style
-							Integer.parseInt(tokens[pos+6]));	// size
+							Integer.parseInt(tokens[pos+6]),	// size
+							RSyntaxTextArea.getDefaultFont().getAttributes());
 					}
 					scheme.styles[i] = new Style(fg, bg, font, underline);
 
@@ -440,13 +462,10 @@ public void restoreDefaults(Font baseFont, boolean fontStyles) {
 		Font commentFont = baseFont;
 		Font keywordFont = baseFont;
 		if (fontStyles) {
-			// WORKAROUND for Sun JRE bug 6282887 (Asian font bug in 1.4/1.5)
-			// That bug seems to be hidden now, see 6289072 instead.
-			StyleContext sc = StyleContext.getDefaultStyleContext();
-			Font boldFont = sc.getFont(baseFont.getFamily(), Font.BOLD,
-					baseFont.getSize());
-			Font italicFont = sc.getFont(baseFont.getFamily(), Font.ITALIC,
-					baseFont.getSize());
+			Font boldFont = getFont(baseFont.getFamily(), Font.BOLD,
+					baseFont.getSize(), baseFont.getAttributes());
+			Font italicFont = getFont(baseFont.getFamily(), Font.ITALIC,
+					baseFont.getSize(), baseFont.getAttributes());
 			commentFont = italicFont;//baseFont.deriveFont(Font.ITALIC);
 			keywordFont = boldFont;//baseFont.deriveFont(Font.BOLD);
 		}

RSyntaxTextArea/src/main/java/org/fife/ui/rsyntaxtextarea/SyntaxView.java

@@ -218,50 +218,34 @@ private float drawLineWithSelection(TokenPainter painter, Token token,
 
 		while (token!=null && token.isPaintable() && nextX<clipEnd) {
 
-			// Selection starts in this token
-			if (token.containsPosition(selStart)) {
-
-				if (selStart>token.getOffset()) {
-					tempToken.copyFrom(token);
-					tempToken.textCount = selStart - tempToken.getOffset();
-					nextX = painter.paint(tempToken,g,nextX,y,host, this, clipStart);
-					tempToken.textCount = token.length();
-					tempToken.makeStartAt(selStart);
-					// Clone required since token and tempToken must be
-					// different tokens for else statement below
-					token = new TokenImpl(tempToken);
-				}
+			// Selection starts or ends in this token
+			if (token.containsPosition(selStart) || token.containsPosition(selEnd)) {
 
-				int tokenLen = token.length();
-				int selCount = Math.min(tokenLen, selEnd-token.getOffset());
-				if (selCount==tokenLen) {
-					nextX = painter.paintSelected(token, g, nextX,y, host,
-											this, clipStart, useSTC);
+				// Paint the entire token, unselected, so the unselected parts look good
+				if (selStart>token.getOffset() || selEnd < token.getEndOffset()) {
+					painter.paint(token, g, nextX, y, host, this, clipStart);
 				}
-				else {
-					tempToken.copyFrom(token);
-					tempToken.textCount = selCount;
-					nextX = painter.paintSelected(tempToken, g, nextX,y, host,
-							this, clipStart, useSTC);
-					tempToken.textCount = token.length();
-					tempToken.makeStartAt(token.getOffset() + selCount);
-					token = tempToken;
-					nextX = painter.paint(token, g, nextX,y, host, this,
-											clipStart);
+// ligatures: ## <> => ++ ~~ <= >= <=> ->>
+//ligatures: ## <> => ++ ~~ <= >= <=> ->>
+				// Figure out where the selection starts and ends
+				float selStartX = nextX;
+				if (selStart > token.getOffset()) {
+					int charCount = selStart - token.getOffset();
+					selStartX = painter.nextX(token, charCount, nextX, host, this);
 				}
+				int tokenSelectionEndCharOffs = Math.min(token.getEndOffset(), selEnd) - token.getOffset();
+				float selEndX = painter.nextX(token, tokenSelectionEndCharOffs, nextX, host, this);
 
-			}
+				// Create a clip region to only paint this token's selection
+				Rectangle origClip = g.getClipBounds();
+				g.setClip((int)selStartX, origClip.y, (int)(selEndX - selStartX), origClip.height);
+				System.out.println("Clip bounds: " + g.getClipBounds());
 
-			// Selection ends in this token
-			else if (token.containsPosition(selEnd)) {
-				tempToken.copyFrom(token);
-				tempToken.textCount = selEnd - tempToken.getOffset();
-				nextX = painter.paintSelected(tempToken, g, nextX,y, host, this,
-						clipStart, useSTC);
-				tempToken.textCount = token.length();
-				tempToken.makeStartAt(selEnd);
-				token = tempToken;
-				nextX = painter.paint(token, g, nextX,y, host, this, clipStart);
+				// Render the entire token, selected, and let the clip region do its magic
+				nextX = painter.paintSelected(token, g, nextX, y, host, this, clipStart, useSTC);
+
+				// Restore the clip
+				g.setClip(origClip);
 			}
 
 			// This token is entirely selected
@@ -727,7 +711,6 @@ public void paint(Graphics g, Shape a) {
 				drawLine(painter, token, g2d, x,y, line);
 			}
 			else {
-				//System.out.println("Drawing line with selection: " + line);
 				drawLineWithSelection(painter,token,g2d, x,y, selStart, selEnd);
 			}
 

RSyntaxTextArea/src/main/java/org/fife/ui/rsyntaxtextarea/Theme.java

@@ -11,13 +11,15 @@
 import java.awt.Color;
 import java.awt.Font;
 import java.awt.SystemColor;
+import java.awt.font.TextAttribute;
 import java.io.BufferedInputStream;
 import java.io.BufferedOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.io.PrintWriter;
 import java.lang.reflect.Field;
+import java.util.Map;
 
 import javax.swing.UIManager;
 import javax.swing.plaf.ColorUIResource;
@@ -226,7 +228,7 @@ public void apply(RSyntaxTextArea textArea) {
 				baseFont.getFamily();
 			int fontSize = lineNumberFontSize>0 ? lineNumberFontSize :
 				baseFont.getSize();
-			Font font = getFont(fontName, Font.PLAIN, fontSize);
+			Font font = getFont(fontName, Font.PLAIN, fontSize, baseFont.getAttributes());
 			gutter.setLineNumberFont(font);
 			gutter.setFoldIndicatorForeground(foldIndicatorFG);
 			gutter.setFoldIndicatorArmedForeground(foldIndicatorArmedFG);
@@ -320,12 +322,20 @@ private static Color getDefaultSelectionFG() {
 	 * @param family The font family.
 	 * @param style The style of font.
 	 * @param size The size of the font.
+	 * @param attrs Optional text attributes.
 	 * @return The font.
 	 */
-	private static Font getFont(String family, int style, int size) {
+	private static Font getFont(String family, int style, int size,
+								Map<TextAttribute, ?> attrs) {
 		// Use StyleContext to get a composite font for Asian glyphs.
+		// WORKAROUND for Sun JRE bug 6282887 (Asian font bug in 1.4/1.5)
+		// That bug seems to be hidden now, see 6289072 instead.
 		StyleContext sc = StyleContext.getDefaultStyleContext();
-		return sc.getFont(family, style, size);
+		Font font = sc.getFont(family, style, size);
+		if (attrs != null) {
+			font = font.deriveFont(attrs);
+		}
+		return font;
 	}
 
 
@@ -693,7 +703,7 @@ else if ("baseFont".equals(qName)) {
 				}
 				String family = attrs.getValue("family");
 				if (family!=null) {
-					theme.baseFont = getFont(family, Font.PLAIN, size);
+					theme.baseFont = getFont(family, Font.PLAIN, size, theme.baseFont.getAttributes());
 				}
 				else if (sizeStr!=null) {
 					// No family specified, keep original family
@@ -862,7 +872,7 @@ else if ("style".equals(qName)) {
 					String familyName = attrs.getValue("fontFamily");
 					if (familyName!=null) {
 						font = getFont(familyName, font.getStyle(),
-								font.getSize());
+								font.getSize(), font.getAttributes());
 					}
 					String sizeStr = attrs.getValue("fontSize");
 					if (sizeStr!=null) {

RSyntaxTextArea/src/main/java/org/fife/ui/rsyntaxtextarea/TokenPainter.java

@@ -24,6 +24,21 @@
 public interface TokenPainter {
 
 
+	/**
+	 * Computes how much horizontal space a token, or part of a token, takes.
+	 *
+	 * @param token The token to examine.
+	 * @param charCount The number of characters in the token to measure..
+	 *        Should be less than or equal to its length.
+	 * @param x The x-offset at which painting would start.
+	 * @param host The parent text area.
+	 * @param e The tab expander.
+	 * @return The length of the text.
+	 */
+	float nextX(Token token, int charCount, float x,
+					 RSyntaxTextArea host, TabExpander e);
+
+
 	/**
 	 * Paints this token.
 	 *

RSyntaxTextArea/src/main/java/org/fife/ui/rtextarea/RTextAreaBase.java

@@ -21,6 +21,10 @@
 import java.awt.event.MouseEvent;
 import java.awt.event.MouseListener;
 import java.awt.event.MouseMotionListener;
+import java.awt.font.TextAttribute;
+import java.text.AttributedCharacterIterator;
+import java.util.HashMap;
+import java.util.Map;
 
 import javax.swing.JTextArea;
 import javax.swing.SwingUtilities;
@@ -462,15 +466,23 @@ public static Font getDefaultFont() {
 			}
 		}
 		else {
-			// Consolas added in Vista, used by VS2010+.
-			font = sc.getFont("Consolas", Font.PLAIN, 13);
-			if (!"Consolas".equals(font.getFamily())) {
-				font = sc.getFont(Font.MONOSPACED, Font.PLAIN, 13);
+			// Cascadia Code was added in later Windows 10/11, default in VS
+			// and VS Code. Consolas was added in Vista, used in older VS.
+			font = sc.getFont("Cascadia Code", Font.PLAIN, 13);
+			if (!"Cascadia Code".equals(font.getFamily())) {
+				font = sc.getFont("Consolas", Font.PLAIN, 13);
+				if (!"Consolas".equals(font.getFamily())) {
+					font = sc.getFont(Font.MONOSPACED, Font.PLAIN, 13);
+				}
 			}
 		}
 
-		//System.out.println(font.getFamily() + ", " + font.getName());
-		return font;
+		System.out.println("fontFamily: " + font.getFamily());
+		// TODO: Make these options configurable via an API, not always on
+		Map<TextAttribute, Object> attrs = new HashMap<>();
+		attrs.put(TextAttribute.KERNING, TextAttribute.KERNING_ON);
+		attrs.put(TextAttribute.LIGATURES, TextAttribute.LIGATURES_ON);
+		return font.deriveFont(attrs);
 
 	}
 

RSyntaxTextAreaDemo/src/main/java/org/fife/ui/rsyntaxtextarea/demo/DemoRootPane.java

@@ -99,6 +99,7 @@ private JMenuBar createMenuBar() {
 
 		JMenu menu = new JMenu("Language");
 		ButtonGroup bg = new ButtonGroup();
+		addSyntaxItem("None", "NoneExample.txt", SYNTAX_STYLE_NONE, bg, menu);
 		addSyntaxItem("6502 Assembler", "Assembler6502.txt", SYNTAX_STYLE_ASSEMBLER_6502, bg, menu);
 		addSyntaxItem("ActionScript", "ActionScriptExample.txt", SYNTAX_STYLE_ACTIONSCRIPT, bg, menu);
 		addSyntaxItem("C",    "CExample.txt", SYNTAX_STYLE_C, bg, menu);

RSyntaxTextAreaDemo/src/main/resources/org/fife/ui/rsyntaxtextarea/demo/JavaExample.txt

@@ -6,6 +6,8 @@ package com.mycompany.demo;
  * @author Your Name
  * http://www.example.com
  */
+// ligatures: ## <> => ++ ~~ <= >= <=> ->>
+   ligatures: ## <> => ++ ~~ <= >= <=> ->>
 public class ExampleCode {
 
    private int value;

RSyntaxTextAreaDemo/src/main/resources/org/fife/ui/rsyntaxtextarea/demo/NoneExample.txt

@@ -0,0 +1 @@
+unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig unnötig