Initial revision

From-SVN: r102074

libjava/classpath/javax/swing/text/rtf/RTFParser.java

@@ -0,0 +1,195 @@
+/* RTFParser.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.IOException;
+import java.io.InputStream;
+import java.io.Reader;
+
+import javax.swing.text.BadLocationException;
+import javax.swing.text.Document;
+
+/**
+ * Parses an RTF file into a {@link Document}. The parser utilizes
+ * {@link RTFScanner}.
+ *
+ * @author Roman Kennke (roman@ontographics.com)
+ */
+class RTFParser
+{
+
+  /**
+   * Our scanner.
+   */
+  private RTFScanner scanner;
+
+  /**
+   * The document into which we parse.
+   */
+  private Document doc;
+
+  /**
+   * The current position.
+   */
+  private int pos;
+
+  /**
+   * Constructs a new RTFParser for the specified document and position,
+   * without initializing the scanner. This is only used internally.
+   *
+   * @param doc the {@link Document} into which we should parse
+   * @param pos the position to start
+   */
+  private RTFParser(Document doc, int pos)
+  {
+    this.doc = doc;
+    this.pos = pos;
+  }
+
+  /**
+   * Constructs a new RTFParser for the specified <code>stream</code>.
+   *
+   * @param stream the stream from which we parse
+   * @param doc the {@link Document} into which we should parse
+   * @param pos the position to start
+   */
+  public RTFParser(InputStream stream, Document doc, int pos)
+  {
+    this(doc, pos);
+    scanner = new RTFScanner(stream);
+  }
+
+  /**
+   * Constructs a new RTFParser for the specified <code>reader</code>.
+   *
+   * @param reader the reader from which we parse
+   * @param doc the {@link Document} into which we should parse
+   * @param pos the position to start
+   */
+  public RTFParser(Reader reader, Document doc, int pos)
+  {
+    this(doc, pos);
+    scanner = new RTFScanner(reader);
+  }
+
+  /**
+   * Returns the {@link Document} in which we parsed the RTF data.
+   *
+   * @return the {@link Document} in which we parsed the RTF data
+   */
+  public Document getDocument()
+  {
+    return doc;
+  }
+
+  /**
+   * Starts the parsing process.
+   */
+  public void parse()
+    throws IOException, BadLocationException
+  {
+    parseFile();
+  }
+
+  /**
+   * The parse rules for &lt;file&gt;.
+   */
+  private void parseFile()
+    throws IOException, BadLocationException
+  {
+    Token t1 = scanner.readToken();
+    if (t1.type != Token.LCURLY)
+      throw new RTFParseException("expected left curly braces");
+
+    parseHeader();
+    parseDocument();
+  
+    Token t2 = scanner.readToken();
+    if (t2.type != Token.RCURLY)
+      throw new RTFParseException("expected right curly braces");
+
+  }
+
+  /**
+   * The parse rules for &lt;header&gt;.
+   *
+   * TODO: implement this properly
+   */
+  private void parseHeader()
+  //throws IOException, BadLocationException
+  {
+    // TODO add parse rules here
+  }
+
+
+  /**
+   * The parse rules for &lt;document&gt;.
+   *
+   * TODO: implement this properly
+   */
+  private void parseDocument()
+    throws IOException, BadLocationException
+  {
+    //  !!! TODO !!!
+    // This simply emits every TEXT Token as text to the document
+    // which is plain stupid
+
+    boolean eof = false;
+
+    do {
+      Token token = scanner.readToken();
+      switch (token.type)
+        {
+        case Token.TEXT:
+          TextToken textToken = (TextToken) token;
+          doc.insertString(pos, textToken.text, null);
+          pos += textToken.text.length();
+          break;
+        case Token.EOF:
+          eof = true;
+          break;
+        default:
+          // FIXME
+          break;
+        }
+    } while (!eof);
+
+  }
+
+}