htmlwriter.java

Mobile 应用程序使用 Java Micro Edition (Java ME) 平台

                write("<base href=\"" + document.getBase() + "\">");
                writeLineSeparator();
            }
            decrIndent();
	}
	
    }

    
    /**
     * Writes out text that is contained in a TEXTAREA form
     * element.
     *
     * @param attr  an AttributeSet
     * @exception IOException on any I/O error
     * @exception BadLocationException if pos represents an invalid
     *            location within the document.
     */
    protected void textAreaContent(AttributeSet attr) throws BadLocationException, IOException {
	Document doc = (Document)attr.getAttribute(StyleConstants.ModelAttribute);
	if (doc != null && doc.getLength() > 0) {
	    if (segment == null) {
		segment = new Segment();
	    }
	    doc.getText(0, doc.getLength(), segment);
	    if (segment.count > 0) {
		inTextArea = true;
		incrIndent();
		indentSmart();
		setCanWrapLines(true);
		replaceEntities = true;
		write(segment.array, segment.offset, segment.count);
		replaceEntities = false;
		setCanWrapLines(false);
		writeLineSeparator();
		inTextArea = false;
		decrIndent();
	    }
	}
    }


    /**
     * Writes out text.  If a range is specified when the constructor
     * is invoked, then only the appropriate range of text is written
     * out.
     *
     * @param elem   an Element
     * @exception IOException on any I/O error
     * @exception BadLocationException if pos represents an invalid
     *            location within the document.
     */
    protected void text(Element elem) throws BadLocationException, IOException {
	int start = Math.max(getStartOffset(), elem.getStartOffset());
	int end = Math.min(getEndOffset(), elem.getEndOffset());
	if (start < end) {
	    if (segment == null) {
		segment = new Segment();
	    }
	    getDocument().getText(start, end - start, segment);
	    newlineOutputed = false;
	    if (segment.count > 0) {
		if (segment.array[segment.offset + segment.count - 1] == '\n'){
		    newlineOutputed = true;
		}
		if (inPre && end == preEndOffset) {
		    if (segment.count > 1) {
			segment.count--;
		    }
		    else {
			return;
		    }
		}
		replaceEntities = true;
		setCanWrapLines(!inPre);
		write(segment.array, segment.offset, segment.count);
		setCanWrapLines(false);
		replaceEntities = false;
	    }
	}
    }

    /**
     * Writes out the content of the SELECT form element.
     * 
     * @param attr the AttributeSet associated with the form element
     * @exception IOException on any I/O error
     */
    protected void selectContent(AttributeSet attr) throws IOException {
	Object model = attr.getAttribute(StyleConstants.ModelAttribute);
	incrIndent();
	if (model instanceof OptionListModel) {
	    OptionListModel listModel = (OptionListModel)model;
	    int size = listModel.getSize();
	    for (int i = 0; i < size; i++) {
		Option option = (Option)listModel.getElementAt(i);
		writeOption(option);
	    }
	} else if (model instanceof OptionComboBoxModel) {
	    OptionComboBoxModel comboBoxModel = (OptionComboBoxModel)model;
	    int size = comboBoxModel.getSize();
	    for (int i = 0; i < size; i++) {
		Option option = (Option)comboBoxModel.getElementAt(i);
		writeOption(option);
	    }
	}
	decrIndent();
    }


    /**
     * Writes out the content of the Option form element.
     * @param option  an Option
     * @exception IOException on any I/O error
     * 
     */
    protected void writeOption(Option option) throws IOException {
	
	indentSmart();
	write('<');
	write("option");
        // PENDING: should this be changed to check for null first?
        Object value = option.getAttributes().getAttribute
                              (HTML.Attribute.VALUE);
	if (value != null) {
	    write(" value="+ value);
	}
	if (option.isSelected()) {
	    write(" selected");
	}
	write('>');
	if (option.getLabel() != null) {
	    write(option.getLabel());
	}
	writeLineSeparator();
    }

    /**
     * Writes out an end tag for the element.
     *
     * @param elem    an Element
     * @exception IOException on any I/O error
     */
    protected void endTag(Element elem) throws IOException {
	if (synthesizedElement(elem)) {
	    return;
	}

	// write out end tags for item on stack
	closeOutUnwantedEmbeddedTags(elem.getAttributes());
	if (inContent) { 
	    if (!newlineOutputed && !inPre) {
		writeLineSeparator();
	    }
	    newlineOutputed = false;
	    inContent = false;
	}
	if (!inPre) {
	    indentSmart();
	}
	if (matchNameAttribute(elem.getAttributes(), HTML.Tag.PRE)) {
	    inPre = false;
	}
        write('<');
        write('/');
        write(elem.getName());
        write('>');
	writeLineSeparator();
    }



    /**
     * Writes out comments.
     *
     * @param elem    an Element
     * @exception IOException on any I/O error
     * @exception BadLocationException if pos represents an invalid
     *            location within the document.
     */
    protected void comment(Element elem) throws BadLocationException, IOException {
	AttributeSet as = elem.getAttributes();
	if (matchNameAttribute(as, HTML.Tag.COMMENT)) {
	    Object comment = as.getAttribute(HTML.Attribute.COMMENT);
	    if (comment instanceof String) {
		writeComment((String)comment);
	    }
	    else {
		writeComment(null);
	    }
	}
    }


    /**
     * Writes out comment string.
     *
     * @param string   the comment
     * @exception IOException on any I/O error
     * @exception BadLocationException if pos represents an invalid
     *            location within the document.
     */
    void writeComment(String string) throws IOException {
	write("<!--");
	if (string != null) {
	    write(string);
	}
	write("-->");
	writeLineSeparator();
        indentSmart();
    }


    /**
     * Writes out any additional comments (comments outside of the body)
     * stored under the property HTMLDocument.AdditionalComments.
     */
    void writeAdditionalComments() throws IOException {
	Object comments = getDocument().getProperty
	                                (HTMLDocument.AdditionalComments);

	if (comments instanceof Vector) {
	    Vector v = (Vector)comments;
	    for (int counter = 0, maxCounter = v.size(); counter < maxCounter;
		 counter++) {
		writeComment(v.elementAt(counter).toString());
	    }
	}
    }


    /**
     * Returns true if the element is a
     * synthesized element.  Currently we are only testing
     * for the p-implied tag.
     */
    protected boolean synthesizedElement(Element elem) {
	if (matchNameAttribute(elem.getAttributes(), HTML.Tag.IMPLIED)) {
	    return true;
	}
	return false;
    }


    /**
     * Returns true if the StyleConstants.NameAttribute is
     * equal to the tag that is passed in as a parameter.
     */
    protected boolean matchNameAttribute(AttributeSet attr, HTML.Tag tag) {
	Object o = attr.getAttribute(StyleConstants.NameAttribute);
	if (o instanceof HTML.Tag) {
	    HTML.Tag name = (HTML.Tag) o;
	    if (name == tag) {
		return true;
	    }
	}
	return false;
    }

    /**
     * Searches for embedded tags in the AttributeSet
     * and writes them out.  It also stores these tags in a vector
     * so that when appropriate the corresponding end tags can be
     * written out.
     *
     * @exception IOException on any I/O error
     */
    protected void writeEmbeddedTags(AttributeSet attr) throws IOException {
	
	// translate css attributes to html
	attr = convertToHTML(attr, oConvAttr);

	Enumeration names = attr.getAttributeNames();
	while (names.hasMoreElements()) {
	    Object name = names.nextElement();
	    if (name instanceof HTML.Tag) {
		HTML.Tag tag = (HTML.Tag)name;
		if (tag == HTML.Tag.FORM || tags.contains(tag)) {
		    continue;
		}
		write('<');
		write(tag.toString());
		Object o = attr.getAttribute(tag);
		if (o != null && o instanceof AttributeSet) {
		    writeAttributes((AttributeSet)o);
		}
		write('>');
		tags.addElement(tag);
		tagValues.addElement(o);
	    }
	}
    }


    /**
     * Searches the attribute set for a tag, both of which
     * are passed in as a parameter.  Returns true if no match is found
     * and false otherwise.
     */
    private boolean noMatchForTagInAttributes(AttributeSet attr, HTML.Tag t,
					      Object tagValue) {
	if (attr != null && attr.isDefined(t)) {
	    Object newValue = attr.getAttribute(t);

	    if ((tagValue == null) ? (newValue == null) :
		(newValue != null && tagValue.equals(newValue))) {
		return false;
	    }
	}
	return true;
    }


    /**
     * Searches the attribute set and for each tag
     * that is stored in the tag vector.  If the tag isnt found,
     * then the tag is removed from the vector and a corresponding
     * end tag is written out.
     *
     * @exception IOException on any I/O error
     */
    protected void closeOutUnwantedEmbeddedTags(AttributeSet attr) throws IOException {

	tagsToRemove.removeAllElements();

	// translate css attributes to html
	attr = convertToHTML(attr, null);

	HTML.Tag t;
	Object tValue;
	int firstIndex = -1;
	int size = tags.size();
	// First, find all the tags that need to be removed.
	for (int i = size - 1; i >= 0; i--) {
	    t = (HTML.Tag)tags.elementAt(i);
	    tValue = tagValues.elementAt(i);
	    if ((attr == null) || noMatchForTagInAttributes(attr, t, tValue)) {
		firstIndex = i;
		tagsToRemove.addElement(t);
	    }
	}
	if (firstIndex != -1) {
	    // Then close them out.
	    boolean removeAll = ((size - firstIndex) == tagsToRemove.size());
	    for (int i = size - 1; i >= firstIndex; i--) {
		t = (HTML.Tag)tags.elementAt(i);
		if (removeAll || tagsToRemove.contains(t)) {
		    tags.removeElementAt(i);
		    tagValues.removeElementAt(i);
		}
		write('<');
		write('/');
		write(t.toString());
		write('>');
	    }
	    // Have to output any tags after firstIndex that still remaing,
	    // as we closed them out, but they should remain open.
	    size = tags.size();
	    for (int i = firstIndex; i < size; i++) {
		t = (HTML.Tag)tags.elementAt(i);
		write('<');
		write(t.toString());
		Object o = tagValues.elementAt(i);
		if (o != null && o instanceof AttributeSet) {
		    writeAttributes((AttributeSet)o);
		}
		write('>');
	    }
	}
    }


    /**
     * Determines if the element associated with the attributeset
     * is a TEXTAREA or SELECT.  If true, returns true else
     * false
     */
    private boolean isFormElementWithContent(AttributeSet attr) {
	if (matchNameAttribute(attr, HTML.Tag.TEXTAREA) ||
	    matchNameAttribute(attr, HTML.Tag.SELECT)) {
	    return true;
	}
	return false;
    }


    /**
     * Determines whether a the indentation needs to be
     * incremented.  Basically, if next is a child of current, and
     * next is NOT a synthesized element, the indent level will be
     * incremented.  If there is a parent-child relationship and "next"
     * is a synthesized element, then its children must be indented.
     * This state is maintained by the indentNext boolean.
     *
     * @return boolean that's true if indent level
     *         needs incrementing.
     */
    private boolean indentNext = false;
    private boolean indentNeedsIncrementing(Element current, Element next) {
	if ((next.getParentElement() == current) && !inPre) {
	    if (indentNext) {
		indentNext = false;
		return true;
	    } else if (synthesizedElement(next)) {
		indentNext = true;
	    } else if (!synthesizedElement(current)){
		return true;
	    }
	}
	return false;
    }

    /**
     * Outputs the maps as elements. Maps are not stored as elements in
     * the document, and as such this is used to output them.
     */
    void writeMaps(Enumeration maps) throws IOException {
	if (maps != null) {
	    while(maps.hasMoreElements()) {
		Map map = (Map)maps.nextElement();