/*
 * Copyright 2000-2010 JetBrains s.r.o.
 *
 * 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 com.intellij.psi.impl.source.xml;

import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiWhiteSpace;
import com.intellij.psi.impl.source.resolve.reference.impl.providers.DtdResolveUtil;
import com.intellij.psi.tree.IElementType;
import com.intellij.psi.xml.XmlContentParticle;
import com.intellij.psi.xml.XmlToken;
import com.intellij.xml.XmlElementDescriptor;

import static com.intellij.psi.xml.XmlTokenType.*;

/**
 * @author Dmitry Avdeev
 */
public class XmlContentParticleImpl implements XmlContentParticle {

  private final XmlToken myToken;

  public XmlContentParticleImpl(XmlToken token) {
    myToken = token;
  }

  @Override
  public Type getType() {
    return Type.ELEMENT;
  }

  @Override
  public Quantifier getQuantifier() {
    return getQuantifierImpl(myToken);
  }

  public static Quantifier getQuantifierImpl(PsiElement element) {
    PsiElement nextSibling = element.getNextSibling();
    while (nextSibling instanceof PsiWhiteSpace) {
      nextSibling = nextSibling.getNextSibling();
    }

    if (nextSibling instanceof XmlToken) {
      IElementType tokenType = ((XmlToken)nextSibling).getTokenType();
      if (tokenType == XML_PLUS) {
        return Quantifier.ONE_OR_MORE;
      }
      else if (tokenType == XML_STAR) {
        return Quantifier.ZERO_OR_MORE;
      }
      else if (tokenType == XML_QUESTION) {
        return Quantifier.OPTIONAL;
      }
    }
    return Quantifier.REQUIRED;
  }

  @Override
  public XmlContentParticle[] getSubParticles() {
    return new XmlContentParticle[0];
  }

  @Override
  public XmlElementDescriptor getElementDescriptor() {
    return DtdResolveUtil.resolveElementReference(myToken.getText(), myToken);
  }
}
