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A packaging of the IntelliJ Community Edition python-community library. This is release number 1 of trunk branch 142.
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/*
 * Copyright 2000-2014 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.jetbrains.python.debugger;

import com.intellij.openapi.application.ApplicationManager;
import com.intellij.openapi.editor.Document;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.util.TextRange;
import com.intellij.xdebugger.XSourcePosition;
import com.intellij.xdebugger.evaluation.XDebuggerEvaluator;
import com.jetbrains.python.console.PyConsoleIndentUtil;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;


public class PyDebuggerEvaluator extends XDebuggerEvaluator {

  private static final PyDebugValue NONE = new PyDebugValue("", "NoneType", "None", false, false, null, null);

  private Project myProject;
  private final PyFrameAccessor myDebugProcess;

  public PyDebuggerEvaluator(@NotNull Project project, @NotNull final PyFrameAccessor debugProcess) {
    myProject = project;
    myDebugProcess = debugProcess;
  }

  @Override
  public void evaluate(@NotNull String expression, @NotNull XEvaluationCallback callback, @Nullable XSourcePosition expressionPosition) {
    doEvaluate(expression, callback, true);
  }

  private void doEvaluate(final String expr, final XEvaluationCallback callback, final boolean doTrunc) {
    ApplicationManager.getApplication().executeOnPooledThread(new Runnable() {
      @Override
      public void run() {
        String expression = expr.trim();
        if (expression.isEmpty()) {
          callback.evaluated(NONE);
          return;
        }

        final boolean isExpression = PyDebugSupportUtils.isExpression(myProject, expression);
        try {
          // todo: think on getting results from EXEC
          final PyDebugValue value = myDebugProcess.evaluate(expression, !isExpression, doTrunc);
          if (value.isErrorOnEval()) {
            callback.errorOccurred("{" + value.getType() + "}" + value.getValue());
          }
          else {
            callback.evaluated(value);
          }
        }
        catch (PyDebuggerException e) {
          callback.errorOccurred(e.getTracebackError());
        }
      }
    });
  }

  @Nullable
  @Override
  public TextRange getExpressionRangeAtOffset(final Project project,
                                              final Document document,
                                              final int offset,
                                              boolean sideEffectsAllowed) {
    return PyDebugSupportUtils.getExpressionRangeAtOffset(project, document, offset);
  }

  @NotNull
  @Override
  public String formatTextForEvaluation(@NotNull String text) {
    return PyConsoleIndentUtil.normalize(text);
  }
}