1 files changed, 61 insertions, 0 deletions
diff --git a/plugins/org.eclipse.dltk.sh.ui/src/org/eclipse/dltk/sh/ui/text/AssignmentRule.java b/plugins/org.eclipse.dltk.sh.ui/src/org/eclipse/dltk/sh/ui/text/AssignmentRule.java
new file mode 100644
index 0000000..fb5f885
--- /dev/null
+++ b/plugins/org.eclipse.dltk.sh.ui/src/org/eclipse/dltk/sh/ui/text/AssignmentRule.java
@@ -0,0 +1,61 @@
+/*******************************************************************************
+ * Copyright (c) 2009 Red Hat Inc. and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     Alexander Kurtakov - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.dltk.sh.ui.text;
+
+import org.eclipse.jface.text.rules.ICharacterScanner;
+import org.eclipse.jface.text.rules.IRule;
+import org.eclipse.jface.text.rules.IToken;
+import org.eclipse.jface.text.rules.IWordDetector;
+import org.eclipse.jface.text.rules.Token;
+
+public class AssignmentRule implements IRule {
+	private final StringBuffer buffer = new StringBuffer();
+	private final IToken defaultToken;
+	private final IWordDetector detector;
+	private final IToken successToken;
+
+	public AssignmentRule(IWordDetector detector, IToken defaultToken, IToken token) {
+		this.detector = detector;
+		this.successToken = token;
+		this.defaultToken = defaultToken;
+	}
+
+	@Override
+	public IToken evaluate(ICharacterScanner scanner) {
+		char c = (char) scanner.read();
+		if (detector.isWordStart((c))) {
+			buffer.setLength(0);
+			do {
+				buffer.append((c));
+				c = (char) scanner.read();
+			} while ((c != ICharacterScanner.EOF) && detector.isWordPart(c));
+			scanner.unread();
+			if (c == '=')
+				return successToken;
+			if (defaultToken.isUndefined())
+				unreadBuffer(scanner);
+			return defaultToken;
+		}
+		scanner.unread();
+		return Token.UNDEFINED;
+	}
+
+	/**
+	 * Returns the characters in the buffer to the scanner.
+	 *
+	 * @param scanner
+	 *            the scanner to be used
+	 */
+	protected void unreadBuffer(ICharacterScanner scanner) {
+		for (int i = buffer.length() - 1; i >= 0; i--)
+			scanner.unread();
+	}
+}