jspdocumentparser.java

业界著名的tomcat服务器的最新6.0的源代码。

                     localName.equals(ATTRIBUTE_ACTION)) {
            current =
                parseStandardAction(
                    qName,
                    localName,
                    nonTaglibAttrs,
                    nonTaglibXmlnsAttrs,
                    taglibAttrs,
                    startMark,
                    current);
            return;
        }

        if (tagDependentPending) {
            tagDependentPending = false;
            tagDependentNesting++;
        }

        if (tagDependentNesting > 0) {
            node =
                new Node.UninterpretedTag(
                    qName,
                    localName,
                    nonTaglibAttrs,
                    nonTaglibXmlnsAttrs,
                    taglibAttrs,
                    startMark,
                    current);
        } else if (JSP_URI.equals(uri)) {
            node =
                parseStandardAction(
                    qName,
                    localName,
                    nonTaglibAttrs,
                    nonTaglibXmlnsAttrs,
                    taglibAttrs,
                    startMark,
                    current);
        } else {
            node =
                parseCustomAction(
                    qName,
                    localName,
                    uri,
                    nonTaglibAttrs,
                    nonTaglibXmlnsAttrs,
                    taglibAttrs,
                    startMark,
                    current);
            if (node == null) {
                node =
                    new Node.UninterpretedTag(
                        qName,
                        localName,
                        nonTaglibAttrs,
                        nonTaglibXmlnsAttrs,
                        taglibAttrs,
                        startMark,
                        current);
            } else {
                // custom action
                String bodyType = getBodyType((Node.CustomTag) node);

                if (scriptlessBodyNode == null
                        && bodyType.equalsIgnoreCase(TagInfo.BODY_CONTENT_SCRIPTLESS)) {
                    scriptlessBodyNode = node;
                }
                else if (TagInfo.BODY_CONTENT_TAG_DEPENDENT.equalsIgnoreCase(bodyType)) {
                    tagDependentPending = true;
                }
            }
        }

        current = node;
    }

    /*
     * Receives notification of character data inside an element.
     *
     * The SAX does not call this method with all of the template text, but may
     * invoke this method with chunks of it.  This is a problem when we try
     * to determine if the text contains only whitespaces, or when we are
     * looking for an EL expression string.  Therefore it is necessary to
     * buffer and concatenate the chunks and process the concatenated text 
     * later (at beginTag and endTag)
     *
     * @param buf The characters
     * @param offset The start position in the character array
     * @param len The number of characters to use from the character array
     *
     * @throws SAXException
     */
    public void characters(char[] buf, int offset, int len) {

        if (charBuffer == null) {
            charBuffer = new StringBuffer();
        }
        charBuffer.append(buf, offset, len);
    }

    private void processChars() throws SAXException {

        if (charBuffer == null || directivesOnly) {
            return;
        }

        /*
         * JSP.6.1.1: All textual nodes that have only white space are to be
         * dropped from the document, except for nodes in a jsp:text element,
         * and any leading and trailing white-space-only textual nodes in a
         * jsp:attribute whose 'trim' attribute is set to FALSE, which are to
         * be kept verbatim.
         * JSP.6.2.3 defines white space characters.
         */
        boolean isAllSpace = true;
        if (!(current instanceof Node.JspText)
            && !(current instanceof Node.NamedAttribute)) {
            for (int i = 0; i < charBuffer.length(); i++) {
                if (!(charBuffer.charAt(i) == ' '
                    || charBuffer.charAt(i) == '\n'
                    || charBuffer.charAt(i) == '\r'
                    || charBuffer.charAt(i) == '\t')) {
                    isAllSpace = false;
                    break;
                }
            }
        }

        if (!isAllSpace && tagDependentPending) {
            tagDependentPending = false;
            tagDependentNesting++;
        }

        if (tagDependentNesting > 0) {
            if (charBuffer.length() > 0) {
                new Node.TemplateText(charBuffer.toString(), startMark, current);
            }
            startMark = new Mark(ctxt, path, locator.getLineNumber(),
                                 locator.getColumnNumber());
            charBuffer = null;
            return;
        }

        if ((current instanceof Node.JspText)
            || (current instanceof Node.NamedAttribute)
            || !isAllSpace) {

            int line = startMark.getLineNumber();
            int column = startMark.getColumnNumber();

            CharArrayWriter ttext = new CharArrayWriter();
            int lastCh = 0, elType = 0;
            for (int i = 0; i < charBuffer.length(); i++) {

                int ch = charBuffer.charAt(i);
                if (ch == '\n') {
                    column = 1;
                    line++;
                } else {
                    column++;
                }
                if ((lastCh == '$' || lastCh == '#') && ch == '{') {
                    elType = lastCh;
                    if (ttext.size() > 0) {
                        new Node.TemplateText(
                            ttext.toString(),
                            startMark,
                            current);
                        ttext = new CharArrayWriter();
                        //We subtract two from the column number to
                        //account for the '[$,#]{' that we've already parsed
                        startMark = new Mark(ctxt, path, line, column - 2);
                    }
                    // following "${" || "#{" to first unquoted "}"
                    i++;
                    boolean singleQ = false;
                    boolean doubleQ = false;
                    lastCh = 0;
                    for (;; i++) {
                        if (i >= charBuffer.length()) {
                            throw new SAXParseException(
                                Localizer.getMessage(
                                    "jsp.error.unterminated",
                                    (char) elType + "{"),
                                locator);

                        }
                        ch = charBuffer.charAt(i);
                        if (ch == '\n') {
                            column = 1;
                            line++;
                        } else {
                            column++;
                        }
                        if (lastCh == '\\' && (singleQ || doubleQ)) {
                            ttext.write(ch);
                            lastCh = 0;
                            continue;
                        }
                        if (ch == '}') {
                            new Node.ELExpression((char) elType,
                                ttext.toString(),
                                startMark,
                                current);
                            ttext = new CharArrayWriter();
                            startMark = new Mark(ctxt, path, line, column);
                            break;
                        }
                        if (ch == '"')
                            doubleQ = !doubleQ;
                        else if (ch == '\'')
                            singleQ = !singleQ;

                        ttext.write(ch);
                        lastCh = ch;
                    }
                } else if (lastCh == '\\' && (ch == '$' || ch == '#')) {
                    ttext.write(ch);
                    ch = 0;  // Not start of EL anymore
                } else {
                    if (lastCh == '$' || lastCh == '#' || lastCh == '\\') {
                        ttext.write(lastCh);
                    }
                    if (ch != '$' && ch != '#' && ch != '\\') {
                        ttext.write(ch);
                    }
                }
                lastCh = ch;
            }
            if (lastCh == '$' || lastCh == '#' || lastCh == '\\') {
                ttext.write(lastCh);
            }
            if (ttext.size() > 0) {
                new Node.TemplateText(ttext.toString(), startMark, current);
            }
        }
        startMark = new Mark(ctxt, path, locator.getLineNumber(),
                             locator.getColumnNumber());

        charBuffer = null;
    }

    /*
     * Receives notification of the end of an element.
     */
    public void endElement(String uri, String localName, String qName)
        throws SAXException {

        processChars();

        if (directivesOnly &&
            !(JSP_URI.equals(uri) && localName.startsWith(DIRECTIVE_ACTION))) {
            return;
        }

        if (current instanceof Node.NamedAttribute) {
            boolean isTrim = ((Node.NamedAttribute)current).isTrim();
            Node.Nodes subElems = ((Node.NamedAttribute)current).getBody();
            for (int i = 0; subElems != null && i < subElems.size(); i++) {
                Node subElem = subElems.getNode(i);
                if (!(subElem instanceof Node.TemplateText)) {
                    continue;
                }
                // Ignore any whitespace (including spaces, carriage returns,
                // line feeds, and tabs, that appear at the beginning and at
                // the end of the body of the <jsp:attribute> action, if the
                // action's 'trim' attribute is set to TRUE (default).
                // In addition, any textual nodes in the <jsp:attribute> that
                // have only white space are dropped from the document, with
                // the exception of leading and trailing white-space-only
                // textual nodes in a <jsp:attribute> whose 'trim' attribute
                // is set to FALSE, which must be kept verbatim.
                if (i == 0) {
                    if (isTrim) {
                        ((Node.TemplateText)subElem).ltrim();
                    }
                } else if (i == subElems.size() - 1) {
                    if (isTrim) {
                        ((Node.TemplateText)subElem).rtrim();
                    }
                } else {
                    if (((Node.TemplateText)subElem).isAllSpace()) {
                        subElems.remove(subElem);
                    }
                }
            }
        } else if (current instanceof Node.ScriptingElement) {
            checkScriptingBody((Node.ScriptingElement)current);
        }

        if ( isTagDependent(current)) {
            tagDependentNesting--;
        }

        if (scriptlessBodyNode != null
                && current.equals(scriptlessBodyNode)) {
            scriptlessBodyNode = null;
        }

        if (current.getParent() != null) {
            current = current.getParent();
        }
    }

    /*
     * Receives the document locator.
     *
     * @param locator the document locator
     */
    public void setDocumentLocator(Locator locator) {
        this.locator = locator;
    }

    /*
     * See org.xml.sax.ext.LexicalHandler.
     */
    public void comment(char[] buf, int offset, int len) throws SAXException {

        processChars();  // Flush char buffer and remove white spaces

        // ignore comments in the DTD
        if (!inDTD) {
            startMark =
                new Mark(
                    ctxt,
                    path,
                    locator.getLineNumber(),
                    locator.getColumnNumber());
            new Node.Comment(new String(buf, offset, len), startMark, current);
        }
    }

    /*
     * See org.xml.sax.ext.LexicalHandler.
     */
    public void startCDATA() throws SAXException {

        processChars();  // Flush char buffer and remove white spaces
        startMark = new Mark(ctxt, path, locator.getLineNumber(),
                             locator.getColumnNumber());
    }

    /*
     * See org.xml.sax.ext.LexicalHandler.
     */
    public void endCDATA() throws SAXException {
        processChars();  // Flush char buffer and remove white spaces
    }

    /*
     * See org.xml.sax.ext.LexicalHandler.
     */
    public void startEntity(String name) throws SAXException {
        // do nothing
    }

    /*
     * See org.xml.sax.ext.LexicalHandler.
     */
    public void endEntity(String name) throws SAXException {
        // do nothing
    }