1 /*
   2  * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
   3  * @LastModified: Oct 2017
   4  */
   5 /*
   6  * Licensed to the Apache Software Foundation (ASF) under one or more
   7  * contributor license agreements.  See the NOTICE file distributed with
   8  * this work for additional information regarding copyright ownership.
   9  * The ASF licenses this file to You under the Apache License, Version 2.0
  10  * (the "License"); you may not use this file except in compliance with
  11  * the License.  You may obtain a copy of the License at
  12  *
  13  *      http://www.apache.org/licenses/LICENSE-2.0
  14  *
  15  * Unless required by applicable law or agreed to in writing, software
  16  * distributed under the License is distributed on an "AS IS" BASIS,
  17  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  18  * See the License for the specific language governing permissions and
  19  * limitations under the License.
  20  */
  21 
  22 package com.sun.org.apache.xalan.internal.xsltc.compiler;
  23 
  24 import com.sun.org.apache.bcel.internal.generic.InstructionList;
  25 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator;
  26 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ErrorMsg;
  27 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator;
  28 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type;
  29 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError;
  30 import java.util.List;
  31 
  32 /**
  33  * @author Jacek Ambroziak
  34  * @author Santiago Pericas-Geertsen
  35  */
  36 final class StringCall extends FunctionCall {
  37     public StringCall(QName fname, List<Expression> arguments) {
  38         super(fname, arguments);
  39     }
  40 
  41     public Type typeCheck(SymbolTable stable) throws TypeCheckError {
  42         final int argc = argumentCount();
  43         if (argc > 1) {
  44             ErrorMsg err = new ErrorMsg(ErrorMsg.ILLEGAL_ARG_ERR, this);
  45             throw new TypeCheckError(err);
  46         }
  47 
  48         if (argc > 0) {
  49             argument().typeCheck(stable);
  50         }
  51         return _type = Type.String;
  52     }
  53 
  54     public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
  55         final InstructionList il = methodGen.getInstructionList();
  56         Type targ;
  57 
  58         if (argumentCount() == 0) {
  59             il.append(methodGen.loadContextNode());
  60             targ = Type.Node;
  61         }
  62         else {
  63             final Expression arg = argument();
  64             arg.translate(classGen, methodGen);
  65             arg.startIterator(classGen, methodGen);
  66             targ = arg.getType();
  67         }
  68 
  69         if (!targ.identicalTo(Type.String)) {
  70             targ.translateTo(classGen, methodGen, Type.String);
  71         }
  72     }
  73 }