xmlelement.java

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      offset = this.scanOneAttribute(input, offset, end, lineNr);
    }

    return offset;
  }


  /**
   * Scans the content of the object.
   *
   * @param input                          Description of Parameter
   * @param offset                         Description of Parameter
   * @param end                            Description of Parameter
   * @param contentOffset                  Description of Parameter
   * @param contentSize                    Description of Parameter
   * @param lineNr                         Description of Parameter
   * @return                               the offset after the XML element;
   *      contentOffset points to the start of the content section; contentSize
   *      is the size of the content section
   * @exception XMLParseException          Description of Exception
   */
  private int scanContent(char[] input,
      int offset,
      int end,
      int[] contentOffset,
      int[] contentSize,
      int[] lineNr)
       throws XMLParseException {
    if (input[offset] == '/') {
      contentSize[0] = 0;

      if (input[offset + 1] != '>') {
        throw this.expectedInput("'>'", lineNr[0]);
      }

      return offset + 2;
    }

    if (input[offset] != '>') {
      throw this.expectedInput("'>'", lineNr[0]);
    }

    if (this.skipLeadingWhitespace) {
      offset = this.skipWhitespace(input, offset + 1, end, lineNr);
    }
    else {
      offset++;
    }

    //    int begin = offset;
    contentOffset[0] = offset;
    int level = 0;
    char[] tag = this.tagName.toCharArray();
    end -= (tag.length + 2);

    while ((offset < end) && (level >= 0)) {
      if (input[offset] == '<') {
        boolean ok = true;

        if ((offset < (end - 1)) && (input[offset + 1] == '!')
            && (input[offset + 2] == '[')) {
          offset++;
          continue;
        }

        for (int i = 0; ok && (i < tag.length); i++) {
          ok &= (input[offset + (i + 1)] == tag[i]);
        }

        ok &= !this.isIdentifierChar(input[offset + tag.length + 1]);

        if (ok) {
          while ((offset < end) && (input[offset] != '>')) {
            offset++;
          }

          if (input[offset - 1] != '/') {
            level++;
          }

          continue;
        }
        else if (input[offset + 1] == '/') {
          ok = true;

          for (int i = 0; ok && (i < tag.length); i++) {
            ok &= (input[offset + (i + 2)] == tag[i]);
          }

          if (ok) {
            contentSize[0] = offset - contentOffset[0];
            offset += tag.length + 2;

            try {
              offset = this.skipWhitespace(input, offset,
                  end + tag.length
                  + 2,
                  lineNr);
            } catch (XMLParseException e) {
              // ignore
            }

            if (input[offset] == '>') {
              level--;
              offset++;
            }

            continue;
          }
        }
      }

      if (input[offset] == '\r') {
        lineNr[0]++;

        if ((offset != end) && (input[offset + 1] == '\n')) {
          offset++;
        }
      }
      else if (input[offset] == '\n') {
        lineNr[0]++;
      }

      offset++;
    }

    if (level >= 0) {
      throw this.unexpectedEndOfData(lineNr[0]);
    }

    if (this.skipLeadingWhitespace) {
      int i = contentOffset[0] + contentSize[0] - 1;

      while ((contentSize[0] >= 0) && (input[i] <= ' ')) {
        i--;
        contentSize[0]--;
      }
    }

    return offset;
  }


  /**
   * Scans an identifier.
   *
   * @param input   Description of Parameter
   * @param offset  Description of Parameter
   * @param end     Description of Parameter
   * @return        the identifier, or <CODE>null</CODE> if offset doesn't point
   *      to an identifier
   */
  private String scanIdentifier(char[] input,
      int offset,
      int end) {
    int begin = offset;

    while ((offset < end) && (this.isIdentifierChar(input[offset]))) {
      offset++;
    }

    if ((offset == end) || (offset == begin)) {
      return null;
    }
    else {
      return new String(input, begin, offset - begin);
    }
  }


  /**
   * Scans one attribute of an object.
   *
   * @param input                          Description of Parameter
   * @param offset                         Description of Parameter
   * @param end                            Description of Parameter
   * @param lineNr                         Description of Parameter
   * @return                               the offset after the attribute
   * @exception XMLParseException          Description of Exception
   */
  private int scanOneAttribute(char[] input,
      int offset,
      int end,
      int[] lineNr)
       throws XMLParseException {
    String key;
    String value;

    key = this.scanIdentifier(input, offset, end);

    if (key == null) {
      throw this.syntaxError("an attribute key", lineNr[0]);
    }

    offset = this.skipWhitespace(input, offset + key.length(), end, lineNr);

    if (this.ignoreCase) {
      key = key.toUpperCase();
    }

    if (input[offset] != '=') {
      throw this.valueMissingForAttribute(key, lineNr[0]);
    }

    offset = this.skipWhitespace(input, offset + 1, end, lineNr);

    value = this.scanString(input, offset, end, lineNr);

    if (value == null) {
      throw this.syntaxError("an attribute value", lineNr[0]);
    }

    if ((value.charAt(0) == '"') || (value.charAt(0) == '\'')) {
      value = value.substring(1, (value.length() - 1));
      offset += 2;
    }

    this.attributes.put(key, this.decodeString(value, lineNr[0]));
    return offset + value.length();
  }


  /**
   * Scans a string. Strings are either identifiers, or text delimited by double
   * quotes.
   *
   * @param input                          Description of Parameter
   * @param offset                         Description of Parameter
   * @param end                            Description of Parameter
   * @param lineNr                         Description of Parameter
   * @return                               the string found, without delimiting
   *      double quotes; or null if offset didn't point to a valid string
   * @exception XMLParseException          Description of Exception
   * @see                                  nanoxml.XMLElement#scanIdentifier
   */
  private String scanString(char[] input,
      int offset,
      int end,
      int[] lineNr)
       throws XMLParseException {
    char delim = input[offset];

    if ((delim == '"') || (delim == '\'')) {
      int begin = offset;
      offset++;

      while ((offset < end) && (input[offset] != delim)) {
        if (input[offset] == '\r') {
          lineNr[0]++;

          if ((offset != end) && (input[offset + 1] == '\n')) {
            offset++;
          }
        }
        else if (input[offset] == '\n') {
          lineNr[0]++;
        }

        offset++;
      }

      if (offset == end) {
        return null;
      }
      else {
        return new String(input, begin, offset - begin + 1);
      }
    }
    else {
      return this.scanIdentifier(input, offset, end);
    }
  }


  /**
   * Scans the class (tag) name of the object.
   *
   * @param input                          Description of Parameter
   * @param offset                         Description of Parameter
   * @param end                            Description of Parameter
   * @param lineNr                         Description of Parameter
   * @return                               the position after the tag name
   * @exception XMLParseException          Description of Exception
   */
  private int scanTagName(char[] input,
      int offset,
      int end,
      int[] lineNr)
       throws XMLParseException {
    this.tagName = this.scanIdentifier(input, offset, end);

    if (this.tagName == null) {
      throw this.syntaxError("a tag name", lineNr[0]);
    }

    return offset + this.tagName.length();
  }


  /**
   * Skips a tag that don't contain any useful data: &lt;?...?&gt;, &lt;!...&gt;
   * and comments.
   *
   * @param input                          Description of Parameter
   * @param offset                         Description of Parameter
   * @param end                            Description of Parameter
   * @param lineNr                         Description of Parameter
   * @return                               the position after the tag
   * @exception XMLParseException          Description of Exception
   */
  private int skipPreamble(char[] input,
      int offset,
      int end,
      int[] lineNr)
       throws XMLParseException {
    char ch;

    do {
      offset = this.skipWhitespace(input, offset, end, lineNr);

      if (input[offset] != '<') {
        this.expectedInput("'<'", lineNr[0]);
      }

      offset++;

      if (offset >= end) {
        throw this.unexpectedEndOfData(lineNr[0]);
      }

      ch = input[offset];

      if ((ch == '!') || (ch == '?')) {
        offset = this.skipBogusTag(input, offset, end, lineNr);
      }
    } while (!isIdentifierChar(ch));

    return offset;
  }


  /**
   * Skips whitespace characters.
   *
   * @param input                          Description of Parameter
   * @param offset                         Description of Parameter
   * @param end                            Description of Parameter
   * @param lineNr                         Description of Parameter
   * @return                               the position after the whitespace
   */
  private int skipWhitespace(char[] input,
      int offset,
      int end,
      int[] lineNr) {
    int startLine = lineNr[0];

    while (offset < end) {
      if (((offset + 6) < end) && (input[offset + 3] == '-')
          && (input[offset + 2] == '-') && (input[offset + 1] == '!')
          && (input[offset] == '<')) {
        offset += 4;

        while ((input[offset] != '-') || (input[offset + 1] != '-')
            || (input[offset + 2] != '>')) {
          if ((offset + 2) >= end) {
            throw this.unexpectedEndOfData(startLine);
          }

          offset++;
        }

        offset += 3;
      }
      else if (input[offset] == '\r') {
        lineNr[0]++;

        if ((offset != end) && (input[offset + 1] == '\n')) {
          offset++;
        }
      }
      else if (input[offset] == '\n') {
        lineNr[0]++;
      }
      else if (input[offset] > ' ') {
        break;
      }

      offset++;
    }

    if (offset == end) {
      throw this.unexpectedEndOfData(startLine);
    }

    return offset;
  }


  /**
   * Creates a parse exception for when an invalid valueset is given to a
   * method.
   *
   * @param key  Description of Parameter
   * @return     Description of the Returned Value
   */
  private XMLParseException invalidValueSet(String key) {
    String msg = "Invalid value set (key = \"" + key + "\")";
    return new XMLParseException(this.getTagName(), msg);
  }


  /**
   * Creates a parse exception for when an invalid value is given to a method.
   *
   * @param key     Description of Parameter
   * @param value   Description of Parameter
   * @param lineNr  Description of Parameter
   * @return        Description of the Returned Value
   */
  private XMLParseException invalidValue(String key,
      String value,
      int lineNr) {
    String msg = "Attribute \"" + key + "\" does not contain a valid "
        + "value (\"" + value + "\")";
    return new XMLParseException(this.getTagName(), lineNr, msg);
  }


  /**
   * The end of the data input has been reached.
   *
   * @param lineNr  Description of Parameter
   * @return        Description of the Returned Value
   */
  private XMLParseException unexpectedEndOfData(int lineNr) {
    String msg = "Unexpected end of data reached";
    return new XMLParseException(this.getTagName(), lineNr, msg);
  }


  /**
   * A syntax error occured.
   *
   * @param context  Description of Parameter
   * @param lineNr   Description of Parameter
   * @return         Description of the Returned Value
   */
  private XMLParseException syntaxError(String context,
      int lineNr) {
    String msg = "Syntax error while parsing " + context;
    return new XMLParseException(this.getTagName(), lineNr, msg);
  }


  /**
   * A character has been expected.
   *
   * @param charSet  Description of Parameter
   * @param lineNr   Description of Parameter
   * @return         Description of the Returned Value
   */
  private XMLParseException expectedInput(String charSet,
      int lineNr) {
    String msg = "Expected: " + charSet;
    return new XMLParseException(this.getTagName(), lineNr, msg);
  }


  /**
   * A value is missing for an attribute.
   *
   * @param key     Description of Parameter
   * @param lineNr  Description of Parameter
   * @return        Description of the Returned Value
   */
  private XMLParseException valueMissingForAttribute(String key,
      int lineNr) {
    String msg = "Value missing for attribute with key \"" + key + "\"";
    return new XMLParseException(this.getTagName(), lineNr, msg);
  }

}