org.extendj.neobeaver.OptionalComponent Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of neobeaver Show documentation
LALR parser generator replacement for Beaver.
There is a newer version: 0.2.0
/* Copyright (c) 2017, Jesper Öqvist
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
package org.extendj.neobeaver;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;

public class OptionalComponent implements Symbol {
  public final Symbol sym;
  public final List rules;
  public final List symbols;

  public static OptionalComponent build(Symbol sym, SymbolCache cache) {
    Symbol opt = cache.opt(sym);
    List rules = new ArrayList<>();
    rules.add(new Rule(opt, Collections.emptyList()));
    rules.add(new Rule(opt, Collections.singletonList(sym)));
    rules = new ArrayList<>(Grammar.canonicalRules(rules));
    return new OptionalComponent(opt, rules, Collections.singletonList(sym));
  }

  public OptionalComponent(Symbol sym, List rules, List symbols) {
    this.sym = sym;
    this.rules = rules;
    this.symbols = symbols;
  }

  @Override public String actionName() {
    return null;
  }

  @Override public boolean isTerminal() {
    return false;
  }

  @Override public int id() {
    return 0;
  }

  @Override public boolean isNamed() {
    return false;
  }

  @Override public String name() {
    return null;
  }

  @Override public String toString() {
    return "";
  }

  @Override public Collection extraRules() {
    return rules;
  }

  @Override public Parser.SourcePosition pos() {
    return new Parser.SourcePosition(0, 0);
  }

  @Override public void setPosition(Parser.SourcePosition position) {

  }
}