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/*
 * Copyright 2014 Objectos, Fábrica de Software LTDA.
 *
 * 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 br.com.objectos.rio.core.main;

import java.util.List;

import br.com.objectos.rio.RioLexer;
import br.com.objectos.rio.RioParser;

import com.google.inject.ImplementedBy;

import org.antlr.v4.runtime.ANTLRInputStream;
import org.antlr.v4.runtime.CommonTokenStream;

/**
 * @author [email protected] (Marcio Endo)
 */
@ImplementedBy(CompilerGuice.class)
abstract class Compiler {

  abstract Rio rio();

  Compiler() {
  }

  public Script compile(Source source) {
    String text = source.getText();

    return Script.builder()
        .rio(rio())
        .expressionList(compile(text))
        .build();
  }

  private List compile(String text) {
    ANTLRInputStream input = new ANTLRInputStream(text);
    RioLexer lexer = new RioLexer(input);
    CommonTokenStream tokenStream = new CommonTokenStream(lexer);
    RioParser rioParser = new RioParser(tokenStream);

    VariableMap variableMap = VariableMap.create();
    ReferenceMap referenceMap = new ReferenceMap(rio(), variableMap);

    ScriptRio scriptRio = new ScriptRio(referenceMap, variableMap);
    ScriptParser scriptParser = new ScriptParser(scriptRio);
    rioParser.addParseListener(scriptParser);
    rioParser.script();

    return scriptParser.getExpressionList();
  }

}