| /* |
| * reserved comment block |
| * DO NOT REMOVE OR ALTER! |
| */ |
| /* |
| * Copyright 2001-2004 The Apache Software Foundation. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| /* |
| * $Id: ValueOf.java,v 1.2.4.1 2005/09/05 09:30:04 pvedula Exp $ |
| */ |
| |
| package com.sun.org.apache.xalan.internal.xsltc.compiler; |
| |
| import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen; |
| import com.sun.org.apache.bcel.internal.generic.INVOKEINTERFACE; |
| import com.sun.org.apache.bcel.internal.generic.INVOKEVIRTUAL; |
| import com.sun.org.apache.bcel.internal.generic.InstructionList; |
| import com.sun.org.apache.bcel.internal.generic.PUSH; |
| import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator; |
| import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ErrorMsg; |
| import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator; |
| import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type; |
| import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError; |
| import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Util; |
| |
| /** |
| * @author Jacek Ambroziak |
| * @author Santiago Pericas-Geertsen |
| * @author Morten Jorgensen |
| */ |
| final class ValueOf extends Instruction { |
| private Expression _select; |
| private boolean _escaping = true; |
| private boolean _isString = false; |
| |
| public void display(int indent) { |
| indent(indent); |
| Util.println("ValueOf"); |
| indent(indent + IndentIncrement); |
| Util.println("select " + _select.toString()); |
| } |
| |
| public void parseContents(Parser parser) { |
| _select = parser.parseExpression(this, "select", null); |
| |
| // make sure required attribute(s) have been set |
| if (_select.isDummy()) { |
| reportError(this, parser, ErrorMsg.REQUIRED_ATTR_ERR, "select"); |
| return; |
| } |
| final String str = getAttribute("disable-output-escaping"); |
| if ((str != null) && (str.equals("yes"))) _escaping = false; |
| } |
| |
| public Type typeCheck(SymbolTable stable) throws TypeCheckError { |
| Type type = _select.typeCheck(stable); |
| |
| // Prefer to handle the value as a node; fall back to String, otherwise |
| if (type != null && !type.identicalTo(Type.Node)) { |
| /*** |
| *** %HZ% Would like to treat result-tree fragments in the same |
| *** %HZ% way as node sets for value-of, but that's running into |
| *** %HZ% some snags. Instead, they'll be converted to String |
| if (type.identicalTo(Type.ResultTree)) { |
| _select = new CastExpr(new CastExpr(_select, Type.NodeSet), |
| Type.Node); |
| } else |
| ***/ |
| if (type.identicalTo(Type.NodeSet)) { |
| _select = new CastExpr(_select, Type.Node); |
| } else { |
| _isString = true; |
| if (!type.identicalTo(Type.String)) { |
| _select = new CastExpr(_select, Type.String); |
| } |
| _isString = true; |
| } |
| } |
| return Type.Void; |
| } |
| |
| public void translate(ClassGenerator classGen, MethodGenerator methodGen) { |
| final ConstantPoolGen cpg = classGen.getConstantPool(); |
| final InstructionList il = methodGen.getInstructionList(); |
| final int setEscaping = cpg.addInterfaceMethodref(OUTPUT_HANDLER, |
| "setEscaping","(Z)Z"); |
| |
| // Turn off character escaping if so is wanted. |
| if (!_escaping) { |
| il.append(methodGen.loadHandler()); |
| il.append(new PUSH(cpg,false)); |
| il.append(new INVOKEINTERFACE(setEscaping,2)); |
| } |
| |
| // Translate the contents. If the value is a string, use the |
| // translet.characters(String, TranslatOutputHandler) method. |
| // Otherwise, the value is a node, and the |
| // dom.characters(int node, TransletOutputHandler) method can dispatch |
| // the string value of the node to the output handler more efficiently. |
| if (_isString) { |
| final int characters = cpg.addMethodref(TRANSLET_CLASS, |
| CHARACTERSW, |
| CHARACTERSW_SIG); |
| |
| il.append(classGen.loadTranslet()); |
| _select.translate(classGen, methodGen); |
| il.append(methodGen.loadHandler()); |
| il.append(new INVOKEVIRTUAL(characters)); |
| } else { |
| final int characters = cpg.addInterfaceMethodref(DOM_INTF, |
| CHARACTERS, |
| CHARACTERS_SIG); |
| |
| il.append(methodGen.loadDOM()); |
| _select.translate(classGen, methodGen); |
| il.append(methodGen.loadHandler()); |
| il.append(new INVOKEINTERFACE(characters, 3)); |
| } |
| |
| // Restore character escaping setting to whatever it was. |
| if (!_escaping) { |
| il.append(methodGen.loadHandler()); |
| il.append(SWAP); |
| il.append(new INVOKEINTERFACE(setEscaping,2)); |
| il.append(POP); |
| } |
| } |
| } |