plugins/javaFX/src/org/jetbrains/plugins/javaFX/fxml/codeInsight/inspections/JavaFxUnresolvedFxIdReferenceInspection.java

/*
 * Copyright 2000-2013 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 org.jetbrains.plugins.javaFX.fxml.codeInsight.inspections;

import com.intellij.codeInsight.ExpectedTypeInfo;
import com.intellij.codeInsight.ExpectedTypeInfoImpl;
import com.intellij.codeInsight.FileModificationService;
import com.intellij.codeInsight.TailType;
import com.intellij.codeInsight.daemon.QuickFixBundle;
import com.intellij.codeInsight.daemon.impl.quickfix.CreateFieldFromUsageFix;
import com.intellij.codeInsight.daemon.impl.quickfix.CreateFieldFromUsageHelper;
import com.intellij.codeInspection.*;
import com.intellij.lang.LanguageNamesValidation;
import com.intellij.lang.refactoring.NamesValidator;
import com.intellij.openapi.project.Project;
import com.intellij.psi.*;
import com.intellij.psi.util.PsiTreeUtil;
import com.intellij.psi.xml.XmlAttribute;
import com.intellij.psi.xml.XmlAttributeValue;
import com.intellij.psi.xml.XmlFile;
import com.intellij.psi.xml.XmlTag;
import com.intellij.util.VisibilityUtil;
import com.intellij.xml.XmlElementDescriptor;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.plugins.javaFX.fxml.FxmlConstants;
import org.jetbrains.plugins.javaFX.fxml.JavaFxFileTypeFactory;
import org.jetbrains.plugins.javaFX.fxml.JavaFxPsiUtil;
import org.jetbrains.plugins.javaFX.fxml.descriptors.JavaFxClassBackedElementDescriptor;
import org.jetbrains.plugins.javaFX.fxml.descriptors.JavaFxDefaultPropertyElementDescriptor;
import org.jetbrains.plugins.javaFX.fxml.refs.JavaFxFieldIdReferenceProvider;

/**
 * User: anna
 */
public class JavaFxUnresolvedFxIdReferenceInspection extends XmlSuppressableInspectionTool {
  @NotNull
  @Override
  public PsiElementVisitor buildVisitor(final @NotNull ProblemsHolder holder,
                                        final boolean isOnTheFly,
                                        @NotNull LocalInspectionToolSession session) {
    return new XmlElementVisitor() {
      @Override
      public void visitXmlFile(XmlFile file) {
        if (!JavaFxFileTypeFactory.isFxml(file)) return;
        super.visitXmlFile(file);
      }

      @Override
      public void visitXmlAttribute(XmlAttribute attribute) {
        if (FxmlConstants.FX_ID.equals(attribute.getName())) {
          final XmlAttributeValue valueElement = attribute.getValueElement();
          if (valueElement != null && valueElement.getTextLength() > 0) {
            final PsiClass controllerClass = JavaFxPsiUtil.getControllerClass(attribute.getContainingFile());
            if (controllerClass != null) {
              final PsiReference reference = valueElement.getReference();
              if (reference instanceof JavaFxFieldIdReferenceProvider.JavaFxControllerFieldRef && ((JavaFxFieldIdReferenceProvider.JavaFxControllerFieldRef)reference).isUnresolved()) {
                final PsiClass fieldClass =
                  checkContext(((JavaFxFieldIdReferenceProvider.JavaFxControllerFieldRef)reference).getXmlAttributeValue());
                if (fieldClass != null) {
                  final String text = reference.getCanonicalText();
                  final NamesValidator namesValidator = LanguageNamesValidation.INSTANCE.forLanguage(fieldClass.getLanguage());
                  boolean validName = namesValidator != null && namesValidator.isIdentifier(text, fieldClass.getProject());
                  holder.registerProblem(reference.getElement(), reference.getRangeInElement(), "Unresolved fx:id reference",
                                         isOnTheFly && validName ? new LocalQuickFix[]{new CreateFieldFromUsageQuickFix(text)} : LocalQuickFix.EMPTY_ARRAY);
                }
              }
            }
          }
        }
      }
    };
  }

  protected static PsiClass checkContext(final XmlAttributeValue attributeValue) {
    if (attributeValue == null) return null;
    final PsiElement parent = attributeValue.getParent();
    if (parent instanceof XmlAttribute) {
      return checkClass(((XmlAttribute)parent).getParent());
    }
    return null;
  }

  private static PsiClass checkClass(XmlTag tag) {
    if (tag != null) {
      final XmlElementDescriptor descriptor = tag.getDescriptor();
      if (descriptor instanceof JavaFxClassBackedElementDescriptor) {
        final PsiElement declaration = descriptor.getDeclaration();
        if (declaration instanceof PsiClass) {
          return (PsiClass)declaration;
        }
      } else if (descriptor instanceof JavaFxDefaultPropertyElementDescriptor) {
        final XmlTag includedRoot = JavaFxDefaultPropertyElementDescriptor.getIncludedRoot(tag);
        if (includedRoot != null && !includedRoot.equals(tag)) {
          return checkClass(includedRoot);
        }
      }
    }
    return null;
  }

  private static class CreateFieldFromUsageQuickFix implements LocalQuickFix {
    private final String myCanonicalName;

    private CreateFieldFromUsageQuickFix(String canonicalName) {
      myCanonicalName = canonicalName;
    }

    @NotNull
    @Override
    public String getName() {
      return QuickFixBundle.message("create.field.from.usage.text", myCanonicalName);
    }

    @NotNull
    @Override
    public String getFamilyName() {
      return QuickFixBundle.message("create.field.from.usage.family");
    }

    @Override
    public void applyFix(@NotNull Project project, @NotNull ProblemDescriptor descriptor) {
      final PsiElement psiElement = descriptor.getPsiElement();
      final XmlAttributeValue attrValue = PsiTreeUtil.getParentOfType(psiElement, XmlAttributeValue.class, false);
      assert attrValue != null;

      final JavaFxFieldIdReferenceProvider.JavaFxControllerFieldRef reference =
        (JavaFxFieldIdReferenceProvider.JavaFxControllerFieldRef)attrValue.getReference();
      assert reference != null;

      final PsiClass targetClass = reference.getAClass();
      if (!FileModificationService.getInstance().prepareFileForWrite(targetClass.getContainingFile())) {
        return;
      }
      final PsiElementFactory factory = JavaPsiFacade.getElementFactory(project);
      PsiField field = factory.createField(reference.getCanonicalText(), PsiType.INT);
      VisibilityUtil.setVisibility(field.getModifierList(), PsiModifier.PUBLIC);

      field = CreateFieldFromUsageHelper.insertField(targetClass, field, psiElement);

      final PsiClassType fieldType = factory.createType(checkContext(reference.getXmlAttributeValue()));
      final ExpectedTypeInfo[] types = {new ExpectedTypeInfoImpl(fieldType, ExpectedTypeInfo.TYPE_OR_SUBTYPE, fieldType, TailType.NONE,
                                                                 null, ExpectedTypeInfoImpl.NULL)};
      CreateFieldFromUsageFix.createFieldFromUsageTemplate(targetClass, project, types, field, false, psiElement);
    }
  }
}