| /* |
| * @(#)$Id$ |
| * |
| * The Apache Software License, Version 1.1 |
| * |
| * |
| * Copyright (c) 2001 The Apache Software Foundation. All rights |
| * reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other makterials provided with the |
| * distribution. |
| * |
| * 3. The end-user documentation included with the redistribution, |
| * if any, must include the following acknowledgment: |
| * "This product includes software developed by the |
| * Apache Software Foundation (http://www.apache.org/)." |
| * Alternately, this acknowledgment may appear in the software itself, |
| * if and wherever such third-party acknowledgments normally appear. |
| * |
| * 4. The names "Xalan" and "Apache Software Foundation" must |
| * not be used to endorse or promote products derived from this |
| * software without prior written permission. For written |
| * permission, please contact apache@apache.org. |
| * |
| * 5. Products derived from this software may not be called "Apache", |
| * nor may "Apache" appear in their name, without prior written |
| * permission of the Apache Software Foundation. |
| * |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR |
| * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation and was |
| * originally based on software copyright (c) 2001, Sun |
| * Microsystems., http://www.sun.com. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| * |
| * @author Jacek Ambroziak |
| * @author Santiago Pericas-Geertsen |
| * @author Morten Jorgensen |
| * |
| */ |
| |
| package org.apache.xalan.xsltc.compiler; |
| |
| import java.util.Vector; |
| import java.util.Hashtable; |
| import java.util.Enumeration; |
| import java.util.StringTokenizer; |
| import java.net.URL; |
| |
| import javax.xml.parsers.*; |
| |
| import org.xml.sax.*; |
| |
| import org.apache.xalan.xsltc.compiler.util.Type; |
| |
| import de.fub.bytecode.generic.*; |
| import de.fub.bytecode.classfile.JavaClass; |
| |
| import org.apache.xalan.xsltc.compiler.util.MethodGenerator; |
| import org.apache.xalan.xsltc.compiler.util.ClassGenerator; |
| import org.apache.xalan.xsltc.compiler.util.TypeCheckError; |
| import org.apache.xalan.xsltc.compiler.util.ErrorMsg; |
| import org.apache.xalan.xsltc.compiler.util.Util; |
| |
| import org.apache.xalan.xsltc.DOM; |
| |
| public final class Stylesheet extends SyntaxTreeNode { |
| |
| private String _version; |
| private QName _name; |
| private String _systemId; |
| private Stylesheet _parentStylesheet; |
| |
| // Contains global variables and parameters defined in the stylesheet |
| private final Vector _globals = new Vector(); |
| |
| // Used to cache the result returned by <code>hasLocalParams()</code>. |
| private Boolean _hasLocalParams = null; |
| |
| // The name of the class being generated. |
| private String _className; |
| |
| // Contains all templates dedined in this stylesheet |
| private final Vector _templates = new Vector(); |
| |
| private int _nextModeSerial = 1; |
| private final Hashtable _modes = new Hashtable(); |
| private final Hashtable _extensions = new Hashtable(); |
| |
| private int _importPrecedence = 1; |
| private Mode _defaultMode; |
| private boolean _multiDocument = false; |
| |
| // All named key elements (needed by Key/IdPattern) |
| private Hashtable _keys = new Hashtable(); |
| |
| private boolean _numberFormattingUsed = false; |
| |
| private boolean _simplified = false; |
| |
| private SourceLoader _loader = null; |
| |
| |
| public boolean isSimplified() { |
| return(_simplified); |
| } |
| |
| public void setSimplified() { |
| _simplified = true; |
| } |
| |
| public void setMultiDocument(boolean flag) { |
| _multiDocument = flag; |
| } |
| |
| public boolean isMultiDOM() { |
| return _multiDocument; |
| } |
| |
| public boolean isImported() { |
| final SyntaxTreeNode parent = getParent(); |
| return ((parent != null) && (parent instanceof Import)); |
| } |
| |
| public boolean isIncluded() { |
| final SyntaxTreeNode parent = getParent(); |
| return ((parent != null) && (parent instanceof Include)); |
| } |
| |
| public void numberFormattingUsed() { |
| _numberFormattingUsed = true; |
| } |
| |
| public void setImportPrecedence(final int precedence) { |
| _importPrecedence = precedence; |
| |
| final Enumeration elements = elements(); |
| while (elements.hasMoreElements()) { |
| final TopLevelElement child = |
| (TopLevelElement)elements.nextElement(); |
| if (child instanceof Include) { |
| Stylesheet included = ((Include)child).getIncludedStylesheet(); |
| if (included != null) { |
| included.setImportPrecedence(precedence); |
| } |
| } |
| } |
| |
| } |
| |
| public int getImportPrecedence() { |
| return _importPrecedence; |
| } |
| |
| public boolean checkForLoop(String systemId) { |
| // Return true if this stylesheet includes/imports itself |
| if (_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 setSystemId(String systemId) { |
| _systemId = 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) { |
| 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(); |
| } |
| } |
| |
| /** |
| * 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"); |
| 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(); |
| |
| _version = getAttribute("version"); |
| |
| addPrefixMapping("xml", "xml"); // Make sure 'xml' maps to 'xml' |
| |
| // 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 |
| final ErrorMsg msg = new ErrorMsg(ErrorMsg.STLREDEF_ERR, this); |
| parser.reportError(Constants.ERROR, msg); |
| } |
| |
| // 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 the children of <tt>element</tt>. |
| * XSLT commands are recognized by the XSLT namespace |
| */ |
| 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) { |
| 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)) { |
| parser.getSymbolTable().setCurrentNode(child); |
| child.parseContents(parser); |
| } |
| } |
| } |
| |
| 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 { |
| 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()); |
| } |
| |
| /** |
| * Translate the stylesheet into JVM bytecodes. |
| */ |
| public void translate() { |
| Output lastOutputElement = null; |
| _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; |
| _templates.addElement(template); |
| getMode(template.getModeName()).addTemplate(template); |
| } |
| // xsl:attribute-set |
| else if (element instanceof AttributeSet) { |
| ((AttributeSet)element).translate(classGen, null); |
| } |
| else if (element instanceof Output) { |
| // save the element for later to pass to compileConstructor |
| lastOutputElement = (Output)element; |
| } |
| else { |
| // Global variables and parameters are handled elsewhere. |
| // Other top-level non-template elements are ignored. Literal |
| // elements outside of templates will never be output. |
| } |
| } |
| |
| processModes(); |
| compileModes(classGen); |
| |
| compileConstructor(classGen, lastOutputElement); |
| |
| if (!getParser().errorsFound()) { |
| getXSLTC().dumpClass(classGen.getJavaClass()); |
| } |
| } |
| |
| /** |
| * Compile the translet's constructor |
| */ |
| private void compileConstructor(ClassGenerator classGen, Output output) { |
| |
| final ConstantPoolGen cpg = classGen.getConstantPool(); |
| final InstructionList il = new InstructionList(); |
| |
| final MethodGenerator constructor = |
| new MethodGenerator(ACC_PUBLIC, |
| de.fub.bytecode.generic.Type.VOID, |
| null, null, "<init>", |
| _className, il, cpg); |
| |
| // Call the constructor in the AbstractTranslet superclass |
| il.append(classGen.loadTranslet()); |
| il.append(new INVOKESPECIAL(cpg.addMethodref(TRANSLET_CLASS, |
| "<init>", "()V"))); |
| |
| // Put the names array into the translet - used for dom/translet mapping |
| final Vector names = getXSLTC().getNamesIndex(); |
| il.append(classGen.loadTranslet()); |
| il.append(new PUSH(cpg, names.size())); |
| il.append(new ANEWARRAY(cpg.addClass(STRING))); |
| |
| for (int i = 0; i < names.size(); i++) { |
| final String name = (String)names.elementAt(i); |
| il.append(DUP); |
| il.append(new PUSH(cpg, i)); |
| il.append(new PUSH(cpg, name)); |
| il.append(AASTORE); |
| } |
| il.append(new PUTFIELD(cpg.addFieldref(TRANSLET_CLASS, |
| NAMES_INDEX, |
| NAMES_INDEX_SIG))); |
| |
| // Put the namespace names array into the translet |
| final Vector namespaces = getXSLTC().getNamespaceIndex(); |
| il.append(classGen.loadTranslet()); |
| il.append(new PUSH(cpg, namespaces.size())); |
| il.append(new ANEWARRAY(cpg.addClass(STRING))); |
| |
| for (int i = 0; i < namespaces.size(); i++) { |
| final String ns = (String)namespaces.elementAt(i); |
| il.append(DUP); |
| il.append(new PUSH(cpg, i)); |
| il.append(new PUSH(cpg, ns)); |
| il.append(AASTORE); |
| } |
| il.append(new PUTFIELD(cpg.addFieldref(TRANSLET_CLASS, |
| NAMESPACE_INDEX, |
| NAMESPACE_INDEX_SIG))); |
| |
| // Compile in code to set the output configuration from <xsl:output> |
| if (output != null) { |
| // Set all the output settings files in the translet |
| output.translate(classGen, constructor); |
| } |
| |
| // Compile default decimal formatting symbols. |
| // This is an implicit, nameless xsl:decimal-format top-level element. |
| if (_numberFormattingUsed) |
| DecimalFormatting.translateDefaultDFS(classGen, constructor); |
| |
| il.append(RETURN); |
| |
| constructor.stripAttributes(true); |
| constructor.setMaxLocals(); |
| constructor.setMaxStack(); |
| classGen.addMethod(constructor.getMethod()); |
| } |
| |
| /** |
| * Compile a topLevel() method into the output class. This method is |
| * called from transform() to handle all non-template top-level elemtents. |
| * Returns the signature of the topLevel() method. |
| */ |
| private String compileTopLevel(ClassGenerator classGen, |
| Enumeration elements) { |
| |
| final ConstantPoolGen cpg = classGen.getConstantPool(); |
| |
| final de.fub.bytecode.generic.Type[] argTypes = { |
| Util.getJCRefType(DOM_INTF_SIG), |
| Util.getJCRefType(NODE_ITERATOR_SIG), |
| Util.getJCRefType(TRANSLET_OUTPUT_SIG) |
| }; |
| |
| final String[] argNames = { |
| DOCUMENT_PNAME, ITERATOR_PNAME, TRANSLET_OUTPUT_PNAME |
| }; |
| |
| final InstructionList il = new InstructionList(); |
| |
| final MethodGenerator toplevel = |
| new MethodGenerator(ACC_PUBLIC, |
| de.fub.bytecode.generic.Type.VOID, |
| argTypes, argNames, |
| "topLevel", _className, il, |
| classGen.getConstantPool()); |
| |
| toplevel.addException("org.apache.xalan.xsltc.TransletException"); |
| |
| // Define and initialize 'current' variable with the root node |
| final LocalVariableGen current = |
| toplevel.addLocalVariable("current", |
| de.fub.bytecode.generic.Type.INT, |
| il.getEnd(), null); |
| |
| final int setFilter = cpg.addInterfaceMethodref(DOM_INTF, |
| "setFilter", |
| "(Lorg/apache/xalan/xsltc/StripFilter;)V"); |
| |
| il.append(new PUSH(cpg, DOM.ROOTNODE)); |
| il.append(new ISTORE(current.getIndex())); |
| |
| // Initialize global variables and parameterns |
| final int m = _globals.size(); |
| for (int i = 0; i < m; i++) { |
| TopLevelElement elem = (TopLevelElement)_globals.elementAt(i); |
| elem.translate(classGen, toplevel); |
| } |
| |
| Vector whitespaceRules = new Vector(); |
| |
| // Compile code for other top-level elements |
| while (elements.hasMoreElements()) { |
| final Object element = elements.nextElement(); |
| /* |
| // xsl:output |
| if (element instanceof Output) { |
| ((Output)element).translate(classGen, toplevel); |
| } |
| // xsl:key |
| else if (element instanceof Key) { |
| final Key key = (Key)element; |
| key.translate(classGen, toplevel); |
| _keys.put(key.getName(),key); |
| } |
| */ |
| // xsl:decimal-format |
| if (element instanceof DecimalFormatting) { |
| ((DecimalFormatting)element).translate(classGen,toplevel); |
| } |
| // xsl:strip/preserve-space |
| else if (element instanceof Whitespace) { |
| whitespaceRules.addAll(((Whitespace)element).getRules()); |
| } |
| // xsl:variable or xsl:param |
| else if (element instanceof VariableBase) { |
| ((VariableBase)element).translate(classGen,toplevel); |
| } |
| } |
| |
| if (whitespaceRules.size() > 0) { |
| Whitespace.translateRules(whitespaceRules,classGen); |
| } |
| |
| if (classGen.containsMethod(STRIP_SPACE, STRIP_SPACE_PARAMS) != null) { |
| il.append(toplevel.loadDOM()); |
| il.append(classGen.loadTranslet()); |
| il.append(new INVOKEINTERFACE(setFilter, 2)); |
| } |
| |
| il.append(RETURN); |
| |
| // Compute max locals + stack and add method to class |
| toplevel.stripAttributes(true); |
| toplevel.setMaxLocals(); |
| toplevel.setMaxStack(); |
| toplevel.removeNOPs(); |
| |
| classGen.addMethod(toplevel.getMethod()); |
| |
| return("("+DOM_INTF_SIG+NODE_ITERATOR_SIG+TRANSLET_OUTPUT_SIG+")V"); |
| } |
| |
| |
| /** |
| * Compile a buildKeys() method into the output class. This method is |
| * called from transform() to handle build all indexes needed by key(). |
| */ |
| private String compileBuildKeys(ClassGenerator classGen) { |
| |
| final ConstantPoolGen cpg = classGen.getConstantPool(); |
| |
| final de.fub.bytecode.generic.Type[] argTypes = { |
| Util.getJCRefType(DOM_INTF_SIG), |
| Util.getJCRefType(NODE_ITERATOR_SIG), |
| Util.getJCRefType(TRANSLET_OUTPUT_SIG), |
| de.fub.bytecode.generic.Type.INT |
| }; |
| |
| final String[] argNames = { |
| DOCUMENT_PNAME, ITERATOR_PNAME, TRANSLET_OUTPUT_PNAME, "current" |
| }; |
| |
| final InstructionList il = new InstructionList(); |
| |
| final MethodGenerator buildKeys = |
| new MethodGenerator(ACC_PUBLIC, |
| de.fub.bytecode.generic.Type.VOID, |
| argTypes, argNames, |
| "buildKeys", _className, il, |
| classGen.getConstantPool()); |
| |
| final int domField = cpg.addFieldref(getClassName(), |
| DOM_FIELD, |
| DOM_INTF_SIG); |
| |
| buildKeys.addException("org.apache.xalan.xsltc.TransletException"); |
| |
| il.append(classGen.loadTranslet()); |
| il.append(new GETFIELD(domField)); // The DOM reference |
| il.append(new ASTORE(1)); |
| |
| final Enumeration elements = elements(); |
| // Compile code for other top-level elements |
| while (elements.hasMoreElements()) { |
| // xsl:key |
| final Object element = elements.nextElement(); |
| if (element instanceof Key) { |
| final Key key = (Key)element; |
| key.translate(classGen, buildKeys); |
| _keys.put(key.getName(),key); |
| } |
| } |
| |
| il.append(RETURN); |
| |
| // Compute max locals + stack and add method to class |
| buildKeys.stripAttributes(true); |
| buildKeys.setMaxLocals(); |
| buildKeys.setMaxStack(); |
| buildKeys.removeNOPs(); |
| |
| classGen.addMethod(buildKeys.getMethod()); |
| |
| return("("+DOM_INTF_SIG+NODE_ITERATOR_SIG+TRANSLET_OUTPUT_SIG+"I)V"); |
| } |
| |
| /** |
| * Compile transform() into the output class. This method is used to |
| * initialize global variables and global parameters. The current node |
| * is set to be the document's root node. |
| */ |
| private void compileTransform(ClassGenerator classGen) { |
| final ConstantPoolGen cpg = classGen.getConstantPool(); |
| |
| /* |
| * Define the the method transform with the following signature: |
| * void transform(DOM, NodeIterator, HandlerBase) |
| */ |
| final de.fub.bytecode.generic.Type[] argTypes = |
| new de.fub.bytecode.generic.Type[3]; |
| argTypes[0] = Util.getJCRefType(DOM_INTF_SIG); |
| argTypes[1] = Util.getJCRefType(NODE_ITERATOR_SIG); |
| argTypes[2] = Util.getJCRefType(TRANSLET_OUTPUT_SIG); |
| |
| final String[] argNames = new String[3]; |
| argNames[0] = DOCUMENT_PNAME; |
| argNames[1] = ITERATOR_PNAME; |
| argNames[2] = TRANSLET_OUTPUT_PNAME; |
| |
| final InstructionList il = new InstructionList(); |
| final MethodGenerator transf = |
| new MethodGenerator(ACC_PUBLIC, |
| de.fub.bytecode.generic.Type.VOID, |
| argTypes, argNames, |
| "transform", |
| _className, |
| il, |
| classGen.getConstantPool()); |
| transf.addException("org.apache.xalan.xsltc.TransletException"); |
| |
| // Define and initialize current with the root node |
| final LocalVariableGen current = |
| transf.addLocalVariable("current", |
| de.fub.bytecode.generic.Type.INT, |
| il.getEnd(), null); |
| final String applyTemplatesSig = classGen.getApplyTemplatesSig(); |
| final int applyTemplates = cpg.addMethodref(getClassName(), |
| "applyTemplates", |
| applyTemplatesSig); |
| final int domField = cpg.addFieldref(getClassName(), |
| DOM_FIELD, |
| DOM_INTF_SIG); |
| |
| // push translet for PUTFIELD |
| il.append(classGen.loadTranslet()); |
| // prepare appropriate DOM implementation |
| |
| if (isMultiDOM()) { |
| il.append(new NEW(cpg.addClass(MULTI_DOM_CLASS))); |
| il.append(DUP); |
| } |
| |
| il.append(classGen.loadTranslet()); |
| il.append(transf.loadDOM()); |
| il.append(new INVOKEVIRTUAL(cpg.addMethodref(TRANSLET_CLASS, |
| "makeDOMAdapter", |
| "("+DOM_INTF_SIG+")"+ |
| DOM_ADAPTER_SIG))); |
| // DOMAdapter is on the stack |
| |
| if (isMultiDOM()) { |
| final int init = cpg.addMethodref(MULTI_DOM_CLASS, |
| "<init>", |
| "("+DOM_INTF_SIG+")V"); |
| il.append(new INVOKESPECIAL(init)); |
| // MultiDOM is on the stack |
| } |
| |
| //store to _dom variable |
| il.append(new PUTFIELD(domField)); |
| |
| // continue with globals initialization |
| il.append(new PUSH(cpg, DOM.ROOTNODE)); |
| il.append(new ISTORE(current.getIndex())); |
| |
| // Transfer the output settings to the output post-processor |
| il.append(classGen.loadTranslet()); |
| il.append(transf.loadHandler()); |
| final int index = cpg.addMethodref(TRANSLET_CLASS, |
| "transferOutputSettings", |
| "("+OUTPUT_HANDLER_SIG+")V"); |
| il.append(new INVOKEVIRTUAL(index)); |
| |
| // Look for top-level elements that need handling |
| final Enumeration toplevel = elements(); |
| if ((_globals.size() > 0) || (toplevel.hasMoreElements())) { |
| // Compile method for handling top-level elements |
| final String topLevelSig = compileTopLevel(classGen, toplevel); |
| // Get a reference to that method |
| final int topLevelIdx = cpg.addMethodref(getClassName(), |
| "topLevel", |
| topLevelSig); |
| // Push all parameters on the stack and call topLevel() |
| il.append(classGen.loadTranslet()); // The 'this' pointer |
| il.append(classGen.loadTranslet()); |
| il.append(new GETFIELD(domField)); // The DOM reference |
| il.append(transf.loadIterator()); |
| il.append(transf.loadHandler()); // The output handler |
| il.append(new INVOKEVIRTUAL(topLevelIdx)); |
| } |
| |
| final String keySig = compileBuildKeys(classGen); |
| final int keyIdx = cpg.addMethodref(getClassName(), |
| "buildKeys", keySig); |
| il.append(classGen.loadTranslet()); // The 'this' pointer |
| il.append(classGen.loadTranslet()); |
| il.append(new GETFIELD(domField)); // The DOM reference |
| il.append(transf.loadIterator()); // Not really used, but... |
| il.append(transf.loadHandler()); // The output handler |
| il.append(new PUSH(cpg, DOM.ROOTNODE)); // Start with the root node |
| il.append(new INVOKEVIRTUAL(keyIdx)); |
| |
| // start document |
| il.append(transf.loadHandler()); |
| il.append(transf.startDocument()); |
| |
| // push first arg for applyTemplates |
| il.append(classGen.loadTranslet()); |
| // push translet for GETFIELD to get DOM arg |
| il.append(classGen.loadTranslet()); |
| il.append(new GETFIELD(domField)); |
| // push remaining 2 args |
| il.append(transf.loadIterator()); |
| il.append(transf.loadHandler()); |
| il.append(new INVOKEVIRTUAL(applyTemplates)); |
| // endDocument |
| il.append(transf.loadHandler()); |
| il.append(transf.endDocument()); |
| |
| il.append(RETURN); |
| |
| // Compute max locals + stack and add method to class |
| transf.stripAttributes(true); |
| transf.setMaxLocals(); |
| transf.setMaxStack(); |
| transf.removeNOPs(); |
| |
| classGen.addMethod(transf.getMethod()); |
| } |
| |
| /** |
| * Peephole optimization: Remove sequences of [ALOAD, POP]. |
| */ |
| private void peepHoleOptimization(MethodGenerator methodGen) { |
| final String pat = "`ALOAD'`POP'`Instruction'"; |
| final InstructionList il = methodGen.getInstructionList(); |
| final FindPattern find = new FindPattern(il); |
| |
| InstructionHandle ih = find.search(pat); |
| while (ih != null) { |
| InstructionHandle[] match = find.getMatch(); |
| try { |
| il.delete(match[0], match[1]); |
| } |
| catch (TargetLostException e) { |
| // TODO: move target down into the list |
| } |
| ih = find.search(pat, match[2]); |
| } |
| } |
| |
| public int addParam(Param param) { |
| _globals.addElement(param); |
| return _globals.size() - 1; |
| } |
| |
| public int addVariable(Variable global) { |
| _globals.addElement(global); |
| return _globals.size() - 1; |
| } |
| |
| public void display(int indent) { |
| indent(indent); |
| Util.println("Stylesheet"); |
| displayContents(indent + IndentIncrement); |
| } |
| |
| // do we need this wrapper ????? |
| public String getNamespace(String prefix) { |
| return lookupNamespace(prefix); |
| } |
| |
| public String getClassName() { |
| return _className; |
| } |
| |
| public Vector getTemplates() { |
| return _templates; |
| } |
| } |