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/*
* $Id: ValueOf.java,v 1.10 2010-11-01 04:34:18 joehw 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);
}
}
}