content: /*
   * Copyright 2016 HuntBugs contributors
   * 
   * 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 one.util.huntbugs.detect;
  
  import com.strobel.decompiler.ast.Expression;
  import one.util.huntbugs.registry.MethodContext;
  import one.util.huntbugs.registry.anno.AstNodes;
  import one.util.huntbugs.registry.anno.AstVisitor;
  import one.util.huntbugs.registry.anno.WarningDefinition;
  import one.util.huntbugs.util.Nodes;
  import one.util.huntbugs.warning.Roles;
  import one.util.huntbugs.warning.Role.StringRole;
  
  /**
   * @author Tagir Valeev
   *
   */
  @WarningDefinition(category="Correctness", name="FloatCompareToNaN", maxScore = 90)
  public class FloatingPointNaN {
      private static final StringRole USED_TYPE = StringRole.forName("USED_TYPE");
      
      @AstVisitor(nodes=AstNodes.EXPRESSIONS)
      public void visit(Expression node, MethodContext ctx) {
          if(node.getCode().isComparison()) {
              Nodes.ifBinaryWithConst(node, (arg, constant) -> {
                  if(constant instanceof Float && Float.isNaN((float) constant)) {
                      ctx.report("FloatCompareToNaN", 0, arg, 
                          Roles.REPLACEMENT_METHOD.create("java/lang/Float", "isNaN", "(F)Z"),
                          USED_TYPE.create("float"));
                  } else if(constant instanceof Double && Double.isNaN((double) constant)) {
                      ctx.report("FloatCompareToNaN", 0, arg, Roles.REPLACEMENT_METHOD.create("java/lang/Double", "isNaN", "(D)Z"),
                          USED_TYPE.create("double"));
                  }
              });
          }
      }
  }
  