1 /*
   2  * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
   3  */
   4 /*
   5  * Licensed to the Apache Software Foundation (ASF) under one or more
   6  * contributor license agreements.  See the NOTICE file distributed with
   7  * this work for additional information regarding copyright ownership.
   8  * The ASF licenses this file to You under the Apache License, Version 2.0
   9  * (the "License"); you may not use this file except in compliance with
  10  * the License.  You may obtain a copy of the License at
  11  *
  12  *      http://www.apache.org/licenses/LICENSE-2.0
  13  *
  14  * Unless required by applicable law or agreed to in writing, software
  15  * distributed under the License is distributed on an "AS IS" BASIS,
  16  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  17  * See the License for the specific language governing permissions and
  18  * limitations under the License.
  19  */
  20 
  21 package com.sun.org.apache.xalan.internal.xsltc.compiler;
  22 
  23 import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
  24 import com.sun.org.apache.bcel.internal.generic.ILOAD;
  25 import com.sun.org.apache.bcel.internal.generic.INVOKESTATIC;
  26 import com.sun.org.apache.bcel.internal.generic.InstructionList;
  27 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator;
  28 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.FilterGenerator;
  29 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator;
  30 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.StringType;
  31 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type;
  32 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError;
  33 import java.util.List;
  34 
  35 /**
  36  * @author Morten Jorgensen
  37  * @LastModified: Oct 2017
  38  */
  39 final class LangCall extends FunctionCall {
  40     private Expression _lang;
  41     private Type _langType;
  42 
  43     /**
  44      * Get the parameters passed to function:
  45      *   lang(string)
  46      */
  47     public LangCall(QName fname, List<Expression> arguments) {
  48         super(fname, arguments);
  49         _lang = argument(0);
  50     }
  51 
  52     /**
  53      *
  54      */
  55     public Type typeCheck(SymbolTable stable) throws TypeCheckError {
  56         _langType = _lang.typeCheck(stable);
  57         if (!(_langType instanceof StringType)) {
  58             _lang = new CastExpr(_lang, Type.String);
  59         }
  60         return Type.Boolean;
  61     }
  62 
  63     /**
  64      *
  65      */
  66     public Type getType() {
  67         return(Type.Boolean);
  68     }
  69 
  70     /**
  71      * This method is called when the constructor is compiled in
  72      * Stylesheet.compileConstructor() and not as the syntax tree is traversed.
  73      */
  74     public void translate(ClassGenerator classGen,
  75                           MethodGenerator methodGen) {
  76         final ConstantPoolGen cpg = classGen.getConstantPool();
  77         final InstructionList il = methodGen.getInstructionList();
  78 
  79         final int tst = cpg.addMethodref(BASIS_LIBRARY_CLASS,
  80                                          "testLanguage",
  81                                          "("+STRING_SIG+DOM_INTF_SIG+"I)Z");
  82         _lang.translate(classGen,methodGen);
  83         il.append(methodGen.loadDOM());
  84         if (classGen instanceof FilterGenerator)
  85             il.append(new ILOAD(1));
  86         else
  87             il.append(methodGen.loadContextNode());
  88         il.append(new INVOKESTATIC(tst));
  89     }
  90 }