/*

 * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.

 */

/*

 * Licensed to the Apache Software Foundation (ASF) under one or more

 * contributor license agreements.  See the NOTICE file distributed with

 * this work for additional information regarding copyright ownership.

 * The ASF licenses this file to You 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.

 */

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.INVOKEVIRTUAL;

import com.sun.org.apache.bcel.internal.generic.InstructionList;

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 java.util.List;

/**

 * @author Jacek Ambroziak

 * @author Santiago Pericas-Geertsen

 * @author Morten Jorgensen

 * @LastModified: Oct 2017

 */

final class StartsWithCall extends FunctionCall {

    private Expression _base = null;

    private Expression _token = null;

    /**

     * Create a starts-with() call - two arguments, both strings

     */

    public StartsWithCall(QName fname, List<Expression> arguments) {

        super(fname, arguments);

    }

    /**

     * Type check the two parameters for this function

     */

    public Type typeCheck(SymbolTable stable) throws TypeCheckError {

        // Check that the function was passed exactly two arguments

        if (argumentCount() != 2) {

            ErrorMsg err = new ErrorMsg(ErrorMsg.ILLEGAL_ARG_ERR,

                                        getName(), this);

            throw new TypeCheckError(err);

        }

        // The first argument must be a String, or cast to a String

        _base = argument(0);

        Type baseType = _base.typeCheck(stable);

        if (baseType != Type.String)

            _base = new CastExpr(_base, Type.String);

        // The second argument must also be a String, or cast to a String

        _token = argument(1);

        Type tokenType = _token.typeCheck(stable);

        if (tokenType != Type.String)

            _token = new CastExpr(_token, Type.String);

        return _type = Type.Boolean;

    }

    /**

     * Compile the expression - leave boolean expression on stack

     */

    public void translate(ClassGenerator classGen, MethodGenerator methodGen) {

        final ConstantPoolGen cpg = classGen.getConstantPool();

        final InstructionList il = methodGen.getInstructionList();

        _base.translate(classGen, methodGen);

        _token.translate(classGen, methodGen);

        il.append(new INVOKEVIRTUAL(cpg.addMethodref(STRING_CLASS,

                                                     "startsWith",

                                                     "("+STRING_SIG+")Z")));

    }

}