SymbolTable.java example

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/*
 * Copyright 2016 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed 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 org.kie.dmn.feel.lang.types;

import org.kie.dmn.feel.lang.Scope;
import org.kie.dmn.feel.runtime.functions.BuiltInFunctions;

import java.util.stream.Stream;

public class SymbolTable {
    private Scope builtInScope = new ScopeImpl( Scope.BUILT_IN, null );

    public SymbolTable() {
        init();
    }

    private void init() {
        // the following automatically adds the GLOBAL scope as a child to the built-in scope
        new ScopeImpl( Scope.GLOBAL, builtInScope );

        // pre-loads all the built in functions and types
        Stream.of( BuiltInFunctions.getFunctions() ).forEach( f -> builtInScope.define( f.getSymbol() ) );
        Stream.of( BuiltInType.values() ).forEach( t -> builtInScope.define( t.getSymbol() ) );
    }

    public Scope getBuiltInScope() {
        return builtInScope;
    }

    public Scope getGlobalScope() {
        return builtInScope.getChildScopes().get( Scope.GLOBAL );
    }
}