verbatim.java

jboss规则引擎

      LineCountEmitter lcEmitter = new LineCountEmitter();
      rtf.replay(lcEmitter);
      int numLines = lcEmitter.lineCount();

      int listingModulus = numLines < modulus ? 1 : modulus;

      double log10numLines = Math.log(numLines) / Math.log(10);

      int listingWidth = width < log10numLines+1
	? (int) Math.floor(log10numLines + 1)
	: width;

      Controller controller = context.getController();
      NamePool namePool = controller.getNamePool();
      NumberLinesEmitter nlEmitter = new NumberLinesEmitter(controller,
							    namePool,
							    startinglinenumber,
							    listingModulus,
							    listingWidth,
							    separator,
							    foStylesheet);
      rtf.replay(nlEmitter);
      return nlEmitter.getResultTreeFragment();
    } catch (TransformerException e) {
      // This "can't" happen.
      System.out.println("Transformer Exception in numberLines");
      return rtf;
    }
  }

  /**
   * <p>Setup the parameters associated with callouts</p>
   *
   * <p>This method queries the stylesheet for the variables
   * associated with line numbering. It is called automatically before
   * callouts are processed. The context is used to retrieve the values,
   * this allows templates to redefine these variables.</p>
   *
   * <p>The following variables are queried. If the variables do not
   * exist, builtin defaults will be used (but you may also get a bunch
   * of messages from the Java interpreter).</p>
   *
   * <dl>
   * <dt><code>callout.graphics</code></dt>
   * <dd>Are we using callout graphics? A value of 0 or "" is false,
   * any other value is true. If callout graphics are not used, the
   * parameters related to graphis are not queried.</dd>
   * <dt><code>callout.graphics.path</code></dt>
   * <dd>Specifies the path to callout graphics.</dd>
   * <dt><code>callout.graphics.extension</code></dt>
   * <dd>Specifies the extension ot use for callout graphics.</dd>
   * <dt><code>callout.graphics.number.limit</code></dt>
   * <dd>Identifies the largest number that can be represented as a
   * graphic. Larger callout numbers will be represented using text.</dd>
   * <dt><code>callout.defaultcolumn</code></dt>
   * <dd>Specifies the default column for callout bullets that do not
   * specify a column.</dd>
   * <dt><code>stylesheet.result.type</code></dt>
   * <dd>Specifies the stylesheet result type. The value is either 'fo'
   * (for XSL Formatting Objects) or it isn't. (builtin default: html).</dd>
   * </dl>
   *
   * @param context The current stylesheet context
   *
   */
  private static void setupCallouts(Context context) {
    NamePool namePool = context.getController().getNamePool();

    boolean useGraphics = false;
    boolean useUnicode = false;

    int unicodeStart = 49;
    int unicodeMax = 0;

    String unicodeFont = "";

    // Hardcoded defaults
    defaultColumn = 60;
    graphicsPath = null;
    graphicsExt = null;
    graphicsMax = 0;
    foStylesheet = false;
    calloutsSetup = true;

    Value variable = null;
    String varString = null;

    // Get the stylesheet type
    varString = getVariable(context, "stylesheet.result.type");
    foStylesheet = (varString.equals("fo"));

    // Get the default column
    varString = getVariable(context, "callout.defaultcolumn");
    try {
      defaultColumn = Integer.parseInt(varString);
    } catch (NumberFormatException nfe) {
      System.out.println("$callout.defaultcolumn is not a number: "
			 + varString);
    }

    // Use graphics at all?
    varString = getVariable(context, "callout.graphics");
    useGraphics = !(varString.equals("0") || varString.equals(""));

    // Use unicode at all?
    varString = getVariable(context, "callout.unicode");
    useUnicode = !(varString.equals("0") || varString.equals(""));

    if (useGraphics) {
      // Get the graphics path
      varString = getVariable(context, "callout.graphics.path");
      graphicsPath = varString;

      // Get the graphics extension
      varString = getVariable(context, "callout.graphics.extension");
      graphicsExt = varString;

      // Get the number limit
      varString = getVariable(context, "callout.graphics.number.limit");
      try {
	graphicsMax = Integer.parseInt(varString);
      } catch (NumberFormatException nfe) {
	System.out.println("$callout.graphics.number.limit is not a number: "
			   + varString);
	graphicsMax = 0;
      }

      fCallout = new FormatGraphicCallout(namePool,
					  graphicsPath,
					  graphicsExt,
					  graphicsMax,
					  foStylesheet);
    } else if (useUnicode) {
      // Get the starting character
      varString = getVariable(context, "callout.unicode.start.character");
      try {
	unicodeStart = Integer.parseInt(varString);
      } catch (NumberFormatException nfe) {
	System.out.println("$callout.unicode.start.character is not a number: "
			   + varString);
	unicodeStart = 48;
      }

      // Get the number limit
      varString = getVariable(context, "callout.unicode.number.limit");
      try {
	unicodeMax = Integer.parseInt(varString);
      } catch (NumberFormatException nfe) {
	System.out.println("$callout.unicode.number.limit is not a number: "
			   + varString);
	unicodeStart = 0;
      }

      // Get the font
      unicodeFont = getVariable(context, "callout.unicode.font");
      if (unicodeFont == null) {
	unicodeFont = "";
      }

      fCallout = new FormatUnicodeCallout(namePool,
					  unicodeFont,
					  unicodeStart,
					  unicodeMax,
					  foStylesheet);
    } else {
      fCallout = new FormatTextCallout(namePool, foStylesheet);
    }
  }

  /**
   * <p>Insert text callouts into a verbatim environment.</p>
   *
   * <p>This method examines the <tt>areaset</tt> and <tt>area</tt> elements
   * in the supplied <tt>areaspec</tt> and decorates the supplied
   * result tree fragment with appropriate callout markers.</p>
   *
   * <p>If a <tt>label</tt> attribute is supplied on an <tt>area</tt>,
   * its content will be used for the label, otherwise the callout
   * number will be used, surrounded by parenthesis. Callout numbers may
   * also be represented as graphics. Callouts are
   * numbered in document order. All of the <tt>area</tt>s in an
   * <tt>areaset</tt> get the same number.</p>
   *
   * <p>Only the <tt>linecolumn</tt> and <tt>linerange</tt> units are
   * supported. If no unit is specifed, <tt>linecolumn</tt> is assumed.
   * If only a line is specified, the callout decoration appears in
   * the defaultColumn. Lines will be padded with blanks to reach the
   * necessary column, but callouts that are located beyond the last
   * line of the verbatim environment will be ignored.</p>
   *
   * <p>Callouts are inserted before the character at the line/column
   * where they are to occur.</p>
   *
   * <p>If graphical callouts are used, and the callout number is less
   * than or equal to the $callout.graphics.number.limit, the following image
   * will be generated for HTML:
   *
   * <pre>
   * &lt;img src="$callout.graphics.path/999$callout.graphics.ext"
   *         alt="conumber">
   * </pre>
   *
   * If the $stylesheet.result.type is 'fo', the following image will
   * be generated:
   *
   * <pre>
   * &lt;fo:external-graphic src="$callout.graphics.path/999$callout.graphics.ext"/>
   * </pre>
   *
   * <p>If the callout number exceeds $callout.graphics.number.limit,
   * the callout will be the callout number surrounded by
   * parenthesis.</p>
   *
   * @param context The stylesheet context.
   * @param areaspecNodeList The source node set that contains the areaspec.
   * @param rtf_ns The result tree fragment of the verbatim environment.
   *
   * @return The modified result tree fragment.
   */
  public static NodeSetValue insertCallouts (Context context,
					     NodeList areaspecNodeList,
					     NodeSetValue rtf_ns) {

    FragmentValue rtf = (FragmentValue) rtf_ns;

    setupCallouts(context);

    try {
      Controller controller = context.getController();
      NamePool namePool = controller.getNamePool();
      CalloutEmitter cEmitter = new CalloutEmitter(controller,
						   namePool,
						   defaultColumn,
						   foStylesheet,
						   fCallout);
      cEmitter.setupCallouts(areaspecNodeList);
      rtf.replay(cEmitter);
      return cEmitter.getResultTreeFragment();
    } catch (TransformerException e) {
      // This "can't" happen.
      System.out.println("Transformer Exception in insertCallouts");
      return rtf;
    }
  }
}