1 files changed, 294 insertions, 0 deletions
diff --git a/libjava/classpath/javax/swing/text/rtf/RTFScanner.java b/libjava/classpath/javax/swing/text/rtf/RTFScanner.java
new file mode 100644
index 000000000..2eca159c4
--- /dev/null
+++ b/libjava/classpath/javax/swing/text/rtf/RTFScanner.java
@@ -0,0 +1,294 @@
+/* RTFScanner.java --
+   Copyright (C) 2005  Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package javax.swing.text.rtf;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.Reader;
+
+/**
+ * Provides a scanner that scans an {@link InputStream} for tokens of the
+ * RTF syntax.
+ *
+ * This scanner is based upon the RTF specification 1.6
+ * available at:
+ *
+ * <a
+ * href="http://msdn.microsoft.com/library/en-us/dnrtfspec/html/rtfspec.asp">
+ * RTF specification at MSDN</a>
+ *
+ * @author Roman Kennke (roman@ontographics.com)
+ */
+class RTFScanner
+{
+
+  /**
+   * The reader from which we read the RTF data.
+   */
+  private Reader in;
+
+  /**
+   * This is used to constuct strings from the read in chars.
+   */
+  private StringBuffer buffer;
+
+  /**
+   * Lookahead token.
+   */
+  private Token lastToken;
+
+  /**
+   * Constructs a new RTFScanner without initializing the {@link Reader}.
+   */
+  private RTFScanner()
+  {
+    buffer = new StringBuffer();
+  }
+
+  /**
+   * Constructs a new RTFScanner for the given {@link InputStream}.
+   * The stream is wrapped into an {@link InputStreamReader} and if it's
+   * not yet buffered then the Reader is wrapped in a {@link BufferedReader}
+   *
+   * @param stream the {@link InputStream} to read RTF data from
+   */
+  public RTFScanner(InputStream stream)
+  {
+    this();
+    InputStreamReader reader = new InputStreamReader(stream);
+    in = new BufferedReader(reader);
+  }
+
+  /**
+   * Constructs a new RTFScanner for the given {@link Reader}.
+   *
+   * If the reader is not an instance of {@link BufferedReader} then it
+   * is wrapped into a BufferedReader.
+   *
+   * @param reader the {@link BufferedReader} to read RTF data from
+   */
+  public RTFScanner(Reader reader)
+  {
+    this();
+    if (reader instanceof BufferedReader)
+      {
+        in = reader;
+      }
+    else
+      {
+        in = new BufferedReader(reader);
+      }
+  }
+
+  /**
+   * Reads in the next {@link Token} from the stream.
+   *
+   * @return the read {@link Token}
+   *
+   * @throws IOException if the underlying stream has problems
+   */
+  private Token readTokenImpl()
+    throws IOException
+  {
+    Token token = null;
+
+    int c = in.read();
+    switch(c)
+      {
+      case -1:
+        token = new Token(Token.EOF);
+        break;
+
+      case '{':
+        token = new Token(Token.LCURLY);
+        break;
+
+      case '}':
+        token = new Token(Token.RCURLY);
+        break;
+
+      case '\\':
+        buffer.delete(0, buffer.length());
+        buffer.append((char) c);
+        token = readControlWord();
+        break;
+
+      default:
+        buffer.delete(0, buffer.length());
+        buffer.append((char) c);
+        token = readText();
+        break;
+      }
+
+    return token;
+  }
+
+  Token peekToken()
+    throws IOException
+  {
+    lastToken = readTokenImpl();
+    return lastToken;
+  }
+
+  Token readToken()
+    throws IOException
+  {
+    Token token;
+    if (lastToken != null)
+      {
+        token = lastToken;
+        lastToken = null;
+      }
+    else
+      token = readTokenImpl();
+    return token;
+  }
+
+  /**
+   * Reads in a control word and optional parameter.
+   *
+   * @return the read in control word as {@link ControlWordToken}
+   *
+   * @throws IOException if the underlying stream has problems
+   */
+  private Token readControlWord()
+    throws IOException
+  {
+    // this flag indicates if we are still reading the name or are already
+    // in the parameter
+    boolean readingName = true;
+    String name = null;
+    String param = null;
+
+    while (true)
+      {
+        in.mark(1);
+        int c = in.read();
+
+        // check for 'a'..'z'
+        if (readingName && (c >= 'a') && (c <= 'z'))
+          {
+            buffer.append((char) c);
+          }
+        else if ((c >= '0') && (c <= '9'))
+          {
+            // if the last char was in the name, then finish reading the name
+            if (readingName)
+              {
+                name = buffer.toString();
+                buffer.delete(0, buffer.length());
+                readingName = false;
+              }
+            buffer.append((char) c);
+          }
+        else
+          {
+            // if we were in the name, then finish this
+            if (readingName)
+              {
+                name = buffer.toString();
+              }
+            // otherwise finish the parameter
+            else
+              {
+                param = buffer.toString();
+              }
+
+            // clear up
+            buffer.delete(0, buffer.length());
+            // reset input buffer to last char
+            in.reset();
+            // break while loop
+            break;
+          }
+      }
+
+    ControlWordToken token = null;
+
+    if (param == null)
+      token = new ControlWordToken(name);
+    else
+      token =new ControlWordToken(name, Integer.parseInt(param));
+
+    return token;
+
+  }
+
+  /**
+   * Reads in a block of text.
+   *
+   * @return the token for the text
+   */
+  private Token readText()
+    throws IOException
+  {
+
+    boolean readingText = true;
+    while (readingText)
+      {
+        in.mark(1);
+        int c = in.read();
+        switch(c)
+          {
+          case '\\':
+          case '{':
+          case '}':
+          case -1:
+            readingText = false;
+            in.reset();
+            break;
+
+          default:
+            buffer.append((char) c);
+            break;
+          }
+
+      }
+
+    String text = buffer.toString();
+    Token token = new TextToken(text);
+
+    buffer.delete(0, buffer.length());
+
+    return token;
+
+  }
+}