plugins/ant/src/com/intellij/lang/ant/dom/AntDomTargetDependsListConverter.java

/*
 * 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.lang.ant.dom;

import com.intellij.openapi.util.TextRange;
import com.intellij.psi.ElementManipulators;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiReference;
import com.intellij.psi.xml.XmlAttribute;
import com.intellij.psi.xml.XmlAttributeValue;
import com.intellij.psi.xml.XmlElement;
import com.intellij.util.text.StringTokenizer;
import com.intellij.util.xml.ConvertContext;
import com.intellij.util.xml.Converter;
import com.intellij.util.xml.CustomReferenceConverter;
import com.intellij.util.xml.GenericDomValue;
import org.jetbrains.annotations.NonNls;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

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

/**
 * @author Eugene Zhuravlev
 *         Date: Apr 16, 2010
 */
public class AntDomTargetDependsListConverter extends Converter<TargetResolver.Result> implements CustomReferenceConverter<TargetResolver.Result>{
  
  public TargetResolver.Result fromString(@Nullable @NonNls String s, ConvertContext context) {
    final AntDomProject project = context.getInvocationElement().getParentOfType(AntDomProject.class, false);
    if (project == null) {
      return null;
    }
    final AntDomTarget contextTarget = context.getInvocationElement().getParentOfType(AntDomTarget.class, false);
    if (contextTarget == null) {
      return null;
    }
    final List<String> refs;
    if (s == null) {
      refs = Collections.emptyList();
    }
    else {
      refs = new ArrayList<String>();
      final StringTokenizer tokenizer = new StringTokenizer(s, ",", false);
      while (tokenizer.hasMoreTokens()) {
        final String ref = tokenizer.nextToken();
        refs.add(ref.trim());
      }
    }
    final TargetResolver.Result result = TargetResolver.resolve(project.getContextAntProject(), contextTarget, refs);
    result.setRefsString(s);
    return result;
  }

  @Nullable
  public String toString(@Nullable TargetResolver.Result result, ConvertContext context) {
    return result != null? result.getRefsString() : null;
  }

  @NotNull
  public PsiReference[] createReferences(GenericDomValue<TargetResolver.Result> value, PsiElement element, ConvertContext context) {
    final XmlElement xmlElement = value.getXmlElement();
    if (!(xmlElement instanceof XmlAttribute)) {
      return PsiReference.EMPTY_ARRAY;
    }
    final XmlAttributeValue valueElement = ((XmlAttribute)xmlElement).getValueElement();
    if (valueElement == null) {
      return PsiReference.EMPTY_ARRAY;
    }
    final String refsString = value.getStringValue();
    if (refsString == null) {
      return PsiReference.EMPTY_ARRAY;
    }
    final List<PsiReference> refs = new ArrayList<PsiReference>();
    final AntDomTargetReference.ReferenceGroup group = new AntDomTargetReference.ReferenceGroup();
    final TextRange wholeStringRange = ElementManipulators.getValueTextRange(valueElement);
    final StringTokenizer tokenizer = new StringTokenizer(refsString, ",", false);
    while (tokenizer.hasMoreTokens()) {
      final String token = tokenizer.nextToken();
      int tokenStartOffset = tokenizer.getCurrentPosition() - token.length();
      final String ref = token.trim();
      if (ref.length() != token.length()) {
        for (int idx = 0; idx < token.length(); idx++) {
          if (Character.isWhitespace(token.charAt(idx))) {
            tokenStartOffset++;
          }
          else {
            break;
          }
        }
      }
      refs.add(new AntDomTargetReference(element, TextRange.from(wholeStringRange.getStartOffset() + tokenStartOffset, ref.length()), group));
    }
    return refs.toArray(new PsiReference[refs.size()]);
  }

}