1 files changed, 134 insertions, 0 deletions
diff --git a/rpm/org.eclipse.linuxtools.rpm.ui.editor/src/org/eclipse/linuxtools/rpm/ui/editor/rules/AuthorEmailRule.java b/rpm/org.eclipse.linuxtools.rpm.ui.editor/src/org/eclipse/linuxtools/rpm/ui/editor/rules/AuthorEmailRule.java
new file mode 100644
index 0000000000..87bd36833c
--- /dev/null
+++ b/rpm/org.eclipse.linuxtools.rpm.ui.editor/src/org/eclipse/linuxtools/rpm/ui/editor/rules/AuthorEmailRule.java
@@ -0,0 +1,134 @@
+/*******************************************************************************
+ * Copyright (c) 2007, 2009 Red Hat, Inc.
+ * 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:
+ *    Red Hat - initial API and implementation
+ *******************************************************************************/
+
+package org.eclipse.linuxtools.rpm.ui.editor.rules;
+
+import org.eclipse.jface.text.rules.ICharacterScanner;
+import org.eclipse.jface.text.rules.IPredicateRule;
+import org.eclipse.jface.text.rules.IToken;
+import org.eclipse.jface.text.rules.Token;
+
+public class AuthorEmailRule implements IPredicateRule {
+
+	/** Buffer used for pattern detection */
+	private StringBuilder fBuffer = new StringBuilder();
+
+	/** The success token */
+	IToken token;
+
+	char START_CHAR = '<';
+
+	char END_CHAR = '>';
+
+	char[] INTER_CHARS = { '@', '.' };
+
+	int STATE_START = 0;
+
+	int STATE_OPENED = 1;
+
+	int STATE_AT = 2;
+
+	int STATE_PERIOD = 3;
+
+	int STATE_DONE = 4;
+
+	public AuthorEmailRule(IToken token) {
+		this.token = token;
+	}
+
+	public IToken getSuccessToken() {
+		return token;
+	}
+
+	public IToken evaluate(ICharacterScanner scanner, boolean resume) {
+		/*
+		 * whether we think we're reading the ending sequence, i.e. the next
+		 * section heading
+		 */
+		int state = STATE_START;
+		fBuffer.setLength(0);
+		int c;
+
+		do {
+			c = scanner.read();
+			fBuffer.append((char) c);
+
+			// we have reached the end of file or line prematurely, this is not
+			// considered success
+			if (c == ICharacterScanner.EOF || (char) c == '\n') {
+				unreadBuffer(scanner, fBuffer);
+				return Token.UNDEFINED;
+			}
+
+			// we encountered the opening character at the beginning
+			if (state == STATE_START && (char) c == START_CHAR) {
+				state++;
+			} else if (state == STATE_OPENED) {
+				// we encountered the first neccessary intermediary char
+				if ((char) c == INTER_CHARS[0]) {
+					state++;
+				}
+
+				// check if we have a valid char
+				if (! (Character.isLetterOrDigit((char) c) || c == '.' || c == '_' || c == '-' || c == '@')){
+					unreadBuffer(scanner, fBuffer);
+					return Token.UNDEFINED;
+				}
+				
+				// we just keep reading
+
+			} else if (state == STATE_AT) {
+				// we encountered the second neccessary intermediary char
+				if ((char) c == INTER_CHARS[1]) {
+					state++;
+				}
+				
+				// check if we have a valid char
+				if (! (Character.isLetterOrDigit((char) c) || c == '.' || c == '_' || c == '-')){
+					unreadBuffer(scanner, fBuffer);
+					return Token.UNDEFINED;
+				}
+				// we just keep reading
+			} else if (state == STATE_PERIOD) {
+				// the last char before the ending char cannot be a '.'
+				if ((char) c == END_CHAR && fBuffer.charAt(fBuffer.length() - 1) != '.')
+					state++;
+				else if ((char) c == END_CHAR){
+					unreadBuffer(scanner, fBuffer);
+					return Token.UNDEFINED;
+				}
+			} else {
+				unreadBuffer(scanner, fBuffer);
+				return Token.UNDEFINED;
+			}
+
+		} while (state != STATE_DONE);
+		
+		// we've gone through all states until we've reached STATE_DONE, success
+		return token;
+	}
+
+	public IToken evaluate(ICharacterScanner scanner) {
+		return evaluate(scanner, false);
+	}
+
+	/**
+	 * Returns the characters in the buffer to the scanner.
+	 * 
+	 * @param scanner
+	 *            the scanner to be used
+	 */
+	protected void unreadBuffer(ICharacterScanner scanner, StringBuilder buffer) {
+		for (int i = buffer.length() - 1; i >= 0; i--)
+			scanner.unread();
+	}
+
+}