stylesheet.java

来自「JAVA的一些源码 JAVA2 STANDARD EDITION DEVELO」· Java 代码 · 共 1,413 行 · 第 1/4 页

     * Get the minimum of the precedence of this stylesheet, any stylesheet
     * imported by this stylesheet and any include/import descendant of this
     * stylesheet.
     */
    public int getMinimumDescendantPrecedence() {
        if (_minimumDescendantPrecedence == -1) {
            // Start with precedence of current stylesheet as a basis.
            int min = getImportPrecedence();

            // Recursively examine all imported/included stylesheets.
            final int inclImpCount = (_includedStylesheets != null)
                                          ? _includedStylesheets.size()
                                          : 0;

            for (int i = 0; i < inclImpCount; i++) {
                int prec = ((Stylesheet)_includedStylesheets.elementAt(i))
                                              .getMinimumDescendantPrecedence();

                if (prec < min) {
                    min = prec;
                }
            }

            _minimumDescendantPrecedence = min;
        }
        return _minimumDescendantPrecedence;
    }
    
    public boolean checkForLoop(String systemId) {
        // Return true if this stylesheet includes/imports itself
        if (_systemId != null && _systemId.equals(systemId)) {
            return true;
        }
        // Then check with any stylesheets that included/imported this one
        if (_parentStylesheet != null) 
            return _parentStylesheet.checkForLoop(systemId);
        // Otherwise OK
        return false;
    }
    
    public void setParser(Parser parser) {
        super.setParser(parser);
        _name = makeStylesheetName("__stylesheet_");
    }
    
    public void setParentStylesheet(Stylesheet parent) {
        _parentStylesheet = parent;
    }
    
    public Stylesheet getParentStylesheet() {
        return _parentStylesheet;
    }

    public void setImportingStylesheet(Stylesheet parent) {
        _importedFrom = parent;
        parent.addIncludedStylesheet(this);
    }

    public void setIncludingStylesheet(Stylesheet parent) {
        _includedFrom = parent;
        parent.addIncludedStylesheet(this);
    }

    public void addIncludedStylesheet(Stylesheet child) {
        if (_includedStylesheets == null) {
            _includedStylesheets = new Vector();
        }
        _includedStylesheets.addElement(child);
    }

    public void setSystemId(String systemId) {
        if (systemId != null) {
            _systemId = SystemIDResolver.getAbsoluteURI(systemId);
        }
    }
    
    public String getSystemId() {
        return _systemId;
    }

    public void setSourceLoader(SourceLoader loader) {
        _loader = loader;
    }
    
    public SourceLoader getSourceLoader() {
        return _loader;
    }

    private QName makeStylesheetName(String prefix) {
        return getParser().getQName(prefix+getXSLTC().nextStylesheetSerial());
    }

    /**
     * Returns true if this stylesheet has global vars or params.
     */
    public boolean hasGlobals() {
        return _globals.size() > 0;
    }

    /**
     * Returns true if at least one template in the stylesheet has params
     * defined. Uses the variable <code>_hasLocalParams</code> to cache the
     * result.
     */
    public boolean hasLocalParams() {
        if (_hasLocalParams == null) {
            Vector templates = getAllValidTemplates();
            final int n = templates.size();
            for (int i = 0; i < n; i++) {
                final Template template = (Template)templates.elementAt(i);
                if (template.hasParams()) {
                    _hasLocalParams = new Boolean(true);
                    return true;
                }
            }
            _hasLocalParams = new Boolean(false);
            return false;
        }
        else {
            return _hasLocalParams.booleanValue();
        }
    }

    /**
     * Adds a single prefix mapping to this syntax tree node.
     * @param prefix Namespace prefix.
     * @param uri Namespace URI.
     */
    protected void addPrefixMapping(String prefix, String uri) {
        if (prefix.equals(EMPTYSTRING) && uri.equals(XHTML_URI)) return;
        super.addPrefixMapping(prefix, uri);
    }

    /**
     * Store extension URIs
     */
    private void extensionURI(String prefixes, SymbolTable stable) {
        if (prefixes != null) {
            StringTokenizer tokens = new StringTokenizer(prefixes);
            while (tokens.hasMoreTokens()) {
                final String prefix = tokens.nextToken();
                final String uri = lookupNamespace(prefix);
                if (uri != null) {
                    _extensions.put(uri, prefix);
                }
            }
        }
    }

    public boolean isExtension(String uri) {
        return (_extensions.get(uri) != null);
    }

    public void excludeExtensionPrefixes(Parser parser) {
        final SymbolTable stable = parser.getSymbolTable();
        final String excludePrefixes = getAttribute("exclude-result-prefixes");
        final String extensionPrefixes = getAttribute("extension-element-prefixes");
        
        // Exclude XSLT uri 
        stable.excludeURI(Constants.XSLT_URI);
        stable.excludeNamespaces(excludePrefixes);
        stable.excludeNamespaces(extensionPrefixes);
        extensionURI(extensionPrefixes, stable);
    }

    /**
     * Parse the version and uri fields of the stylesheet and add an
     * entry to the symbol table mapping the name <tt>__stylesheet_</tt>
     * to an instance of this class.
     */
    public void parseContents(Parser parser) {
        final SymbolTable stable = parser.getSymbolTable();

        /*
        // Make sure the XSL version set in this stylesheet
        if ((_version == null) || (_version.equals(EMPTYSTRING))) {
            reportError(this, parser, ErrorMsg.REQUIRED_ATTR_ERR,"version");
        }
        // Verify that the version is 1.0 and nothing else
        else if (!_version.equals("1.0")) {
            reportError(this, parser, ErrorMsg.XSL_VERSION_ERR, _version);
        }
        */

        // Add the implicit mapping of 'xml' to the XML namespace URI
        addPrefixMapping("xml", "http://www.w3.org/XML/1998/namespace");

        // Report and error if more than one stylesheet defined
        final Stylesheet sheet = stable.addStylesheet(_name, this);
        if (sheet != null) {
            // Error: more that one stylesheet defined
            ErrorMsg err = new ErrorMsg(ErrorMsg.MULTIPLE_STYLESHEET_ERR,this);
            parser.reportError(Constants.ERROR, err);
        }

        // If this is a simplified stylesheet we must create a template that
        // grabs the root node of the input doc ( <xsl:template match="/"/> ).
        // This template needs the current element (the one passed to this
        // method) as its only child, so the Template class has a special
        // method that handles this (parseSimplified()).
        if (_simplified) {
            stable.excludeURI(XSLT_URI);
            Template template = new Template();
            template.parseSimplified(this, parser);
        }
        // Parse the children of this node
        else {
            parseOwnChildren(parser);
        }
    }

    /**
     * Parse all direct children of the <xsl:stylesheet/> element.
     */
    public final void parseOwnChildren(Parser parser) {
        final Vector contents = getContents();
        final int count = contents.size();

        // We have to scan the stylesheet element's top-level elements for
        // variables and/or parameters before we parse the other elements
        for (int i = 0; i < count; i++) {
            SyntaxTreeNode child = (SyntaxTreeNode)contents.elementAt(i);
            if ((child instanceof VariableBase) ||
                (child instanceof NamespaceAlias)) {
                parser.getSymbolTable().setCurrentNode(child);
                child.parseContents(parser);
            }
        }

        // Now go through all the other top-level elements...
        for (int i = 0; i < count; i++) {
            SyntaxTreeNode child = (SyntaxTreeNode)contents.elementAt(i);
            if (!(child instanceof VariableBase) && 
                !(child instanceof NamespaceAlias)) {
                parser.getSymbolTable().setCurrentNode(child);
                child.parseContents(parser);
            }

            // All template code should be compiled as methods if the
            // <xsl:apply-imports/> element was ever used in this stylesheet
            if (!_templateInlining && (child instanceof Template)) {
                Template template = (Template)child;
                String name = "template$dot$" + template.getPosition();
                template.setName(parser.getQName(name));
            }
        }
    }

    public void processModes() {
        if (_defaultMode == null)
            _defaultMode = new Mode(null, this, Constants.EMPTYSTRING);
        _defaultMode.processPatterns(_keys);
        final Enumeration modes = _modes.elements();
        while (modes.hasMoreElements()) {
            final Mode mode = (Mode)modes.nextElement();
            mode.processPatterns(_keys);
        }
    }
        
    private void compileModes(ClassGenerator classGen) {
        _defaultMode.compileApplyTemplates(classGen);
        final Enumeration modes = _modes.elements();
        while (modes.hasMoreElements()) {
            final Mode mode = (Mode)modes.nextElement();
            mode.compileApplyTemplates(classGen);
        }
    }

    public Mode getMode(QName modeName) {
        if (modeName == null) {
            if (_defaultMode == null) {
                _defaultMode = new Mode(null, this, Constants.EMPTYSTRING);
            }
            return _defaultMode;
        }
        else {
            Mode mode = (Mode)_modes.get(modeName);
            if (mode == null) {
                final String suffix = Integer.toString(_nextModeSerial++);
                _modes.put(modeName, mode = new Mode(modeName, this, suffix));
            }
            return mode;
        }
    }

    /**
     * Type check all the children of this node.
     */
    public Type typeCheck(SymbolTable stable) throws TypeCheckError {
        final int count = _globals.size();
        for (int i = 0; i < count; i++) {
            final VariableBase var = (VariableBase)_globals.elementAt(i);
            var.typeCheck(stable);
        }
        return typeCheckContents(stable);
    }

    /**
     * Translate the stylesheet into JVM bytecodes. 
     */
    public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
        translate();
    }

    private void addDOMField(ClassGenerator classGen) {
        final FieldGen fgen = new FieldGen(ACC_PUBLIC,
                                           Util.getJCRefType(DOM_INTF_SIG),
                                           DOM_FIELD,
                                           classGen.getConstantPool());
        classGen.addField(fgen.getField());
    }
    
    /**
     * Add a static field
     */
    private void addStaticField(ClassGenerator classGen, String type,
                                String name)
    {
        final FieldGen fgen = new FieldGen(ACC_PROTECTED|ACC_STATIC,
                                           Util.getJCRefType(type),
                                           name,
                                           classGen.getConstantPool());
        classGen.addField(fgen.getField());

    }

    /**
     * Translate the stylesheet into JVM bytecodes. 
     */
    public void translate() {
        _className = getXSLTC().getClassName();

        // Define a new class by extending TRANSLET_CLASS
        final ClassGenerator classGen =
            new ClassGenerator(_className,
                               TRANSLET_CLASS,
                               Constants.EMPTYSTRING,
                               ACC_PUBLIC | ACC_SUPER,
                               null, this);
        
        addDOMField(classGen);

        // Compile transform() to initialize parameters, globals & output
        // and run the transformation
        compileTransform(classGen);

        // Translate all non-template elements and filter out all templates
        final Enumeration elements = elements();
        while (elements.hasMoreElements()) {
            Object element = elements.nextElement();
            // xsl:template
            if (element instanceof Template) {
                // Separate templates by modes
                final Template template = (Template)element;