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 * 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
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package org.apache.sling.scripting.sightly.impl.compiler.util;

import java.util.HashMap;
import java.util.Map;

public class SymbolGenerator {

    public static final String DEFAULT_VAR_PREFIX = "var_";

    private int counter = 0;
    private final String prefix;
    private final Map<String, String> globals = new HashMap<>();

    public SymbolGenerator() {
        this(DEFAULT_VAR_PREFIX);
    }

    public SymbolGenerator(String prefix) {
        this.prefix = prefix;
    }

    public String next(String hint) {
        String middle = (hint != null) ? hint.replace("-", "_") : "";
        return prefix + middle + counter++;
    }

    public String global(String hint) {
        String name = prefix +  ((hint != null) ? hint.replace("-", "_") : "");
        return globals.computeIfAbsent(name, key -> name + counter++);
    }

    public String next() {
        return next(null);
    }

}