plugins/IntelliLang/java-support/org/intellij/plugins/intelliLang/inject/java/validation/UnknownLanguageID.java

/*
 * Copyright 2006 Sascha Weinreuter
 *
 * 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.intellij.plugins.intelliLang.inject.java.validation;

import com.intellij.codeHighlighting.HighlightDisplayLevel;
import com.intellij.codeInspection.LocalInspectionTool;
import com.intellij.codeInspection.ProblemHighlightType;
import com.intellij.codeInspection.ProblemsHolder;
import com.intellij.psi.*;
import com.intellij.psi.injection.ReferenceInjector;
import com.intellij.psi.util.PsiTreeUtil;
import org.intellij.plugins.intelliLang.Configuration;
import org.intellij.plugins.intelliLang.inject.InjectedLanguage;
import org.intellij.plugins.intelliLang.pattern.PatternValidator;
import org.jetbrains.annotations.NonNls;
import org.jetbrains.annotations.NotNull;

public class UnknownLanguageID extends LocalInspectionTool {

  @NotNull
  public HighlightDisplayLevel getDefaultLevel() {
    return HighlightDisplayLevel.ERROR;
  }

  public boolean isEnabledByDefault() {
    return true;
  }

  @NotNull
  public String getGroupDisplayName() {
    return PatternValidator.LANGUAGE_INJECTION;
  }

  @NotNull
  public String getDisplayName() {
    return "Unknown Language ID";
  }

  @NotNull
  public PsiElementVisitor buildVisitor(@NotNull final ProblemsHolder holder, boolean isOnTheFly) {
    return new JavaElementVisitor() {
      final String annotationName = Configuration.getProjectInstance(holder.getProject()).getAdvancedConfiguration().getLanguageAnnotationClass();

      @Override
      public void visitNameValuePair(PsiNameValuePair valuePair) {
        final PsiAnnotation annotation = PsiTreeUtil.getParentOfType(valuePair, PsiAnnotation.class);
        if (annotation != null) {
          final String qualifiedName = annotation.getQualifiedName();
          if (annotationName.equals(qualifiedName)) {
            final String name = valuePair.getName();
            if (name == null || "value".equals(name)) {
              final PsiAnnotationMemberValue value = valuePair.getValue();
              if (value instanceof PsiExpression) {
                final PsiExpression expression = (PsiExpression)value;
                final Object id = JavaPsiFacade.getInstance(expression.getProject()).
                  getConstantEvaluationHelper().computeConstantExpression(expression);
                if (id instanceof String) {
                  if (InjectedLanguage.findLanguageById((String)id) == null && ReferenceInjector.findById((String)id) == null) {
                    holder.registerProblem(expression, "Unknown language '" + id + "'", ProblemHighlightType.LIKE_UNKNOWN_SYMBOL);
                  }
                }
              }
            }
          }
        }
      }
    };
  }

  @NotNull
  @NonNls
  public String getShortName() {
    return "UnknownLanguage";
  }
}