Rework EvaluationResultImpl class hierarchy.

editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/object/DartObjectComputer.java

Index: editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/object/DartObjectComputer.java
diff --git a/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/object/DartObjectComputer.java b/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/object/DartObjectComputer.java
new file mode 100644
index 0000000000000000000000000000000000000000..d20082f636b04ef8a9391d3bff10f6105c69828c
--- /dev/null
+++ b/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/object/DartObjectComputer.java
@@ -0,0 +1,362 @@
+/*
+ * Copyright (c) 2013, the Dart project authors.
+ * 
+ * Licensed under the Eclipse Public License v1.0 (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.eclipse.org/legal/epl-v10.html
+ * 
+ * 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.google.dart.engine.internal.object;
+
+import com.google.dart.engine.ast.AstNode;
+import com.google.dart.engine.ast.BinaryExpression;
+import com.google.dart.engine.ast.Expression;
+import com.google.dart.engine.internal.constant.EvaluationResultImpl;
+import com.google.dart.engine.internal.error.ErrorReporter;
+import com.google.dart.engine.internal.resolver.TypeProvider;
+
+/**
+ * Instances of the class {@code DartObjectComputer} contain methods for manipulating instances of a
+ * Dart class and for collecting errors during evaluation.
+ */
+public class DartObjectComputer {
+  /**
+   * The error reporter that we are using to collect errors.
+   */
+  private ErrorReporter errorReporter;
+
+  /**
+   * The type provider. Used to create objects of the appropriate types, and to identify when an
+   * object is of a built-in type.
+   */
+  private TypeProvider typeProvider;
+
+  public DartObjectComputer(ErrorReporter errorReporter, TypeProvider typeProvider) {
+    this.errorReporter = errorReporter;
+    this.typeProvider = typeProvider;
+  }
+
+  public DartObjectImpl add(BinaryExpression node, DartObjectImpl leftOperand,
+      DartObjectImpl rightOperand) {
+    if (leftOperand != null && rightOperand != null) {
+      try {
+        return leftOperand.add(typeProvider, rightOperand);
+      } catch (EvaluationException exception) {
+        errorReporter.reportErrorForNode(exception.getErrorCode(), node);
+        return null;
+      }
+    }
+    return null;
+  }
+
+  /**
+   * Return the result of applying boolean conversion to this result.
+   * 
+   * @param node the node against which errors should be reported
+   * @return the result of applying boolean conversion to the given value
+   */
+  public DartObjectImpl applyBooleanConversion(AstNode node, DartObjectImpl evaluationResult) {
+    if (evaluationResult != null) {
+      try {
+        return evaluationResult.convertToBool(typeProvider);
+      } catch (EvaluationException exception) {
+        errorReporter.reportErrorForNode(exception.getErrorCode(), node);
+      }
+    }
+    return null;
+  }
+
+  public DartObjectImpl bitAnd(BinaryExpression node, DartObjectImpl leftOperand,
+      DartObjectImpl rightOperand) {
+    if (leftOperand != null && rightOperand != null) {
+      try {
+        return leftOperand.bitAnd(typeProvider, rightOperand);
+      } catch (EvaluationException exception) {
+        errorReporter.reportErrorForNode(exception.getErrorCode(), node);
+      }
+    }
+    return null;
+  }
+
+  public DartObjectImpl bitNot(Expression node, DartObjectImpl evaluationResult) {
+    if (evaluationResult != null) {
+      try {
+        return evaluationResult.bitNot(typeProvider);
+      } catch (EvaluationException exception) {
+        errorReporter.reportErrorForNode(exception.getErrorCode(), node);
+      }
+    }
+    return null;
+  }
+
+  public DartObjectImpl bitOr(BinaryExpression node, DartObjectImpl leftOperand,
+      DartObjectImpl rightOperand) {
+    if (leftOperand != null && rightOperand != null) {
+      try {
+        return leftOperand.bitOr(typeProvider, rightOperand);
+      } catch (EvaluationException exception) {
+        errorReporter.reportErrorForNode(exception.getErrorCode(), node);
+      }
+    }
+    return null;
+  }
+
+  public DartObjectImpl bitXor(BinaryExpression node, DartObjectImpl leftOperand,
+      DartObjectImpl rightOperand) {
+    if (leftOperand != null && rightOperand != null) {
+      try {
+        return leftOperand.bitXor(typeProvider, rightOperand);
+      } catch (EvaluationException exception) {
+        errorReporter.reportErrorForNode(exception.getErrorCode(), node);
+      }
+    }
+    return null;
+  }
+
+  public DartObjectImpl concatenate(Expression node, DartObjectImpl leftOperand,
+      DartObjectImpl rightOperand) {
+    if (leftOperand != null && rightOperand != null) {
+      try {
+        return leftOperand.concatenate(typeProvider, rightOperand);
+      } catch (EvaluationException exception) {
+        errorReporter.reportErrorForNode(exception.getErrorCode(), node);
+      }
+    }
+    return null;
+  }
+
+  public DartObjectImpl divide(BinaryExpression node, DartObjectImpl leftOperand,
+      DartObjectImpl rightOperand) {
+    if (leftOperand != null && rightOperand != null) {
+      try {
+        return leftOperand.divide(typeProvider, rightOperand);
+      } catch (EvaluationException exception) {
+        errorReporter.reportErrorForNode(exception.getErrorCode(), node);
+      }
+    }
+    return null;
+  }
+
+  public DartObjectImpl equalEqual(Expression node, DartObjectImpl leftOperand,
+      DartObjectImpl rightOperand) {
+    if (leftOperand != null && rightOperand != null) {
+      try {
+        return leftOperand.equalEqual(typeProvider, rightOperand);
+      } catch (EvaluationException exception) {
+        errorReporter.reportErrorForNode(exception.getErrorCode(), node);
+      }
+    }
+    return null;
+  }
+
+  public DartObjectImpl greaterThan(BinaryExpression node, DartObjectImpl leftOperand,
+      DartObjectImpl rightOperand) {
+    if (leftOperand != null && rightOperand != null) {
+      try {
+        return leftOperand.greaterThan(typeProvider, rightOperand);
+      } catch (EvaluationException exception) {
+        errorReporter.reportErrorForNode(exception.getErrorCode(), node);
+      }
+    }
+    return null;
+  }
+
+  public DartObjectImpl greaterThanOrEqual(BinaryExpression node, DartObjectImpl leftOperand,
+      DartObjectImpl rightOperand) {
+    if (leftOperand != null && rightOperand != null) {
+      try {
+        return leftOperand.greaterThanOrEqual(typeProvider, rightOperand);
+      } catch (EvaluationException exception) {
+        errorReporter.reportErrorForNode(exception.getErrorCode(), node);
+      }
+    }
+    return null;
+  }
+
+  public DartObjectImpl integerDivide(BinaryExpression node, DartObjectImpl leftOperand,
+      DartObjectImpl rightOperand) {
+    if (leftOperand != null && rightOperand != null) {
+      try {
+        return leftOperand.integerDivide(typeProvider, rightOperand);
+      } catch (EvaluationException exception) {
+        errorReporter.reportErrorForNode(exception.getErrorCode(), node);
+      }
+    }
+    return null;
+  }
+
+  public DartObjectImpl lessThan(BinaryExpression node, DartObjectImpl leftOperand,
+      DartObjectImpl rightOperand) {
+    if (leftOperand != null && rightOperand != null) {
+      try {
+        return leftOperand.lessThan(typeProvider, rightOperand);
+      } catch (EvaluationException exception) {
+        errorReporter.reportErrorForNode(exception.getErrorCode(), node);
+      }
+    }
+    return null;
+  }
+
+  public DartObjectImpl lessThanOrEqual(BinaryExpression node, DartObjectImpl leftOperand,
+      DartObjectImpl rightOperand) {
+    if (leftOperand != null && rightOperand != null) {
+      try {
+        return leftOperand.lessThanOrEqual(typeProvider, rightOperand);
+      } catch (EvaluationException exception) {
+        errorReporter.reportErrorForNode(exception.getErrorCode(), node);
+      }
+    }
+    return null;
+  }
+
+  public DartObjectImpl logicalAnd(BinaryExpression node, DartObjectImpl leftOperand,
+      DartObjectImpl rightOperand) {
+    if (leftOperand != null && rightOperand != null) {
+      try {
+        return leftOperand.logicalAnd(typeProvider, rightOperand);
+      } catch (EvaluationException exception) {
+        errorReporter.reportErrorForNode(exception.getErrorCode(), node);
+      }
+    }
+    return null;
+  }
+
+  public DartObjectImpl logicalNot(Expression node, DartObjectImpl evaluationResult) {
+    if (evaluationResult != null) {
+      try {
+        return evaluationResult.logicalNot(typeProvider);
+      } catch (EvaluationException exception) {
+        errorReporter.reportErrorForNode(exception.getErrorCode(), node);
+      }
+    }
+    return null;
+  }
+
+  public DartObjectImpl logicalOr(BinaryExpression node, DartObjectImpl leftOperand,
+      DartObjectImpl rightOperand) {
+    if (leftOperand != null && rightOperand != null) {
+      try {
+        return leftOperand.logicalOr(typeProvider, rightOperand);
+      } catch (EvaluationException exception) {
+        errorReporter.reportErrorForNode(exception.getErrorCode(), node);
+      }
+    }
+    return null;
+  }
+
+  public DartObjectImpl minus(BinaryExpression node, DartObjectImpl leftOperand,
+      DartObjectImpl rightOperand) {
+    if (leftOperand != null && rightOperand != null) {
+      try {
+        return leftOperand.minus(typeProvider, rightOperand);
+      } catch (EvaluationException exception) {
+        errorReporter.reportErrorForNode(exception.getErrorCode(), node);
+      }
+    }
+    return null;
+  }
+
+  public DartObjectImpl negated(Expression node, DartObjectImpl evaluationResult) {
+    if (evaluationResult != null) {
+      try {
+        return evaluationResult.negated(typeProvider);
+      } catch (EvaluationException exception) {
+        errorReporter.reportErrorForNode(exception.getErrorCode(), node);
+      }
+    }
+    return null;
+  }
+
+  public DartObjectImpl notEqual(BinaryExpression node, DartObjectImpl leftOperand,
+      DartObjectImpl rightOperand) {
+    if (leftOperand != null && rightOperand != null) {
+      try {
+        return leftOperand.notEqual(typeProvider, rightOperand);
+      } catch (EvaluationException exception) {
+        errorReporter.reportErrorForNode(exception.getErrorCode(), node);
+      }
+    }
+    return null;
+  }
+
+  public DartObjectImpl performToString(AstNode node, DartObjectImpl evaluationResult) {
+    if (evaluationResult != null) {
+      try {
+        return evaluationResult.performToString(typeProvider);
+      } catch (EvaluationException exception) {
+        errorReporter.reportErrorForNode(exception.getErrorCode(), node);
+      }
+    }
+    return null;
+  }
+
+  public DartObjectImpl remainder(BinaryExpression node, DartObjectImpl leftOperand,
+      DartObjectImpl rightOperand) {
+    if (leftOperand != null && rightOperand != null) {
+      try {
+        return leftOperand.remainder(typeProvider, rightOperand);
+      } catch (EvaluationException exception) {
+        errorReporter.reportErrorForNode(exception.getErrorCode(), node);
+      }
+    }
+    return null;
+  }
+
+  public DartObjectImpl shiftLeft(BinaryExpression node, DartObjectImpl leftOperand,
+      DartObjectImpl rightOperand) {
+    if (leftOperand != null && rightOperand != null) {
+      try {
+        return leftOperand.shiftLeft(typeProvider, rightOperand);
+      } catch (EvaluationException exception) {
+        errorReporter.reportErrorForNode(exception.getErrorCode(), node);
+      }
+    }
+    return null;
+  }
+
+  public DartObjectImpl shiftRight(BinaryExpression node, DartObjectImpl leftOperand,
+      DartObjectImpl rightOperand) {
+    if (leftOperand != null && rightOperand != null) {
+      try {
+        return leftOperand.shiftRight(typeProvider, rightOperand);
+      } catch (EvaluationException exception) {
+        errorReporter.reportErrorForNode(exception.getErrorCode(), node);
+      }
+    }
+    return null;
+  }
+
+  /**
+   * Return the result of invoking the 'length' getter on this result.
+   * 
+   * @param node the node against which errors should be reported
+   * @return the result of invoking the 'length' getter on this result
+   */
+  public EvaluationResultImpl stringLength(Expression node, EvaluationResultImpl evaluationResult) {
+    if (evaluationResult.getValue() != null) {
+      try {
+        return new EvaluationResultImpl(evaluationResult.getValue().stringLength(typeProvider));
+      } catch (EvaluationException exception) {
+        errorReporter.reportErrorForNode(exception.getErrorCode(), node);
+      }
+    }
+    return new EvaluationResultImpl(null);
+  }
+
+  public DartObjectImpl times(BinaryExpression node, DartObjectImpl leftOperand,
+      DartObjectImpl rightOperand) {
+    if (leftOperand != null && rightOperand != null) {
+      try {
+        return leftOperand.times(typeProvider, rightOperand);
+      } catch (EvaluationException exception) {
+        errorReporter.reportErrorForNode(exception.getErrorCode(), node);
+      }
+    }
+    return null;
+  }
+}