src/examples/Mini/Variable.java

/*
 * 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
 *
 *   https://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 Mini;

import org.apache.bcel.generic.LocalVariableGen;

/**
 * Represents a variable declared in a LET expression or a FUN declaration.
 */
public class Variable implements EnvEntry {
    private final ASTIdent name; // Reference to the original declaration
    private final boolean reserved; // Is a key word?

    private final int line, column; // Extracted from name.getToken()
    private final String var_name; // Short for name.getName()
    private LocalVariableGen local_var; // local var associated with this variable

    public Variable(final ASTIdent name) {
        this(name, false);
    }

    public Variable(final ASTIdent name, final boolean reserved) {
        this.name = name;
        this.reserved = reserved;

        var_name = name.getName();
        line = name.getLine();
        column = name.getColumn();
    }

    @Override
    public int getColumn() {
        return column;
    }

    @Override
    public String getHashKey() {
        return var_name;
    }

    @Override
    public int getLine() {
        return line;
    }

    LocalVariableGen getLocalVariable() {
        return local_var;
    }

    public ASTIdent getName() {
        return name;
    }

    public int getType() {
        return name.getType();
    }

    void setLocalVariable(final LocalVariableGen local_var) {
        this.local_var = local_var;
    }

    @Override
    public String toString() {
        if (!reserved) {
            return var_name + " declared at line " + line + ", column " + column;
        }
        return var_name + " <reserved key word>";
    }
}