Basic 'Quick Fix' support and one fix as example/test

editor/tools/plugins/com.google.dart.tools.ui/src/com/google/dart/tools/ui/internal/text/correction/QuickFixProcessor.java

Index: editor/tools/plugins/com.google.dart.tools.ui/src/com/google/dart/tools/ui/internal/text/correction/QuickFixProcessor.java
diff --git a/editor/tools/plugins/com.google.dart.tools.ui/src/com/google/dart/tools/ui/internal/text/correction/QuickFixProcessor.java b/editor/tools/plugins/com.google.dart.tools.ui/src/com/google/dart/tools/ui/internal/text/correction/QuickFixProcessor.java
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+++ b/editor/tools/plugins/com.google.dart.tools.ui/src/com/google/dart/tools/ui/internal/text/correction/QuickFixProcessor.java
@@ -0,0 +1,123 @@
+/*
+ * Copyright (c) 2012, 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.tools.ui.internal.text.correction;
+
+import com.google.common.collect.Lists;
+import com.google.dart.compiler.ErrorCode;
+import com.google.dart.compiler.ast.DartMethodInvocation;
+import com.google.dart.compiler.ast.DartNode;
+import com.google.dart.compiler.resolver.ClassElement;
+import com.google.dart.compiler.resolver.Element;
+import com.google.dart.compiler.resolver.MethodElement;
+import com.google.dart.compiler.resolver.TypeErrorCode;
+import com.google.dart.tools.core.dom.PropertyDescriptorHelper;
+import com.google.dart.tools.core.model.CompilationUnit;
+import com.google.dart.tools.core.model.SourceRange;
+import com.google.dart.tools.core.refactoring.CompilationUnitChange;
+import com.google.dart.tools.internal.corext.SourceRangeFactory;
+import com.google.dart.tools.internal.corext.refactoring.code.ExtractUtils;
+import com.google.dart.tools.internal.corext.refactoring.util.Messages;
+import com.google.dart.tools.ui.DartPluginImages;
+import com.google.dart.tools.ui.internal.text.correction.proposals.CUCorrectionProposal;
+import com.google.dart.tools.ui.text.dart.IDartCompletionProposal;
+import com.google.dart.tools.ui.text.dart.IInvocationContext;
+import com.google.dart.tools.ui.text.dart.IProblemLocation;
+import com.google.dart.tools.ui.text.dart.IQuickFixProcessor;
+
+import org.eclipse.core.runtime.CoreException;
+import org.eclipse.swt.graphics.Image;
+import org.eclipse.text.edits.MultiTextEdit;
+import org.eclipse.text.edits.ReplaceEdit;
+import org.eclipse.text.edits.TextEdit;
+
+import java.util.List;
+
+/**
+ * Standard {@link IQuickFixProcessor} for Dart.
+ * 
+ * @coverage dart.editor.ui.correction
+ */
+public class QuickFixProcessor implements IQuickFixProcessor {
+  private static ReplaceEdit createReplaceEdit(SourceRange range, String text) {
+    return new ReplaceEdit(range.getOffset(), range.getLength(), text);
+  }
+
+  private CompilationUnit unit;
+  private ExtractUtils utils;
+  private DartNode node;
+  private final List<ICommandAccess> proposals = Lists.newArrayList();
+
+  private final List<TextEdit> textEdits = Lists.newArrayList();
+
+  @Override
+  public IDartCompletionProposal[] getCorrections(IInvocationContext context,
+      IProblemLocation[] locations) throws CoreException {
+    proposals.clear();
+    unit = context.getCompilationUnit();
+    utils = new ExtractUtils(unit, context.getASTRoot());
+    for (IProblemLocation location : locations) {
+      textEdits.clear();
+      node = location.getCoveringNode(utils.getUnitNode());
+      if (node != null) {
+        ErrorCode errorCode = location.getProblemId();
+        if (errorCode == TypeErrorCode.IS_STATIC_METHOD_IN) {
+          addFix_useStaticAccess_method(location);
+        }
+      }
+    }
+    return proposals.toArray(new IDartCompletionProposal[proposals.size()]);
+  }
+
+  @Override
+  public boolean hasCorrections(CompilationUnit unit, ErrorCode problemId) {
+    return true;
+  }
+
+  private void addFix_useStaticAccess_method(IProblemLocation location) {
+    if (PropertyDescriptorHelper.getLocationInParent(node) == PropertyDescriptorHelper.DART_METHOD_INVOCATION_FUNCTION_NAME) {
+      DartMethodInvocation invocation = (DartMethodInvocation) node.getParent();
+      Element methodElement = node.getElement();
+      if (methodElement instanceof MethodElement
+          && methodElement.getEnclosingElement() instanceof ClassElement) {
+        ClassElement classElement = (ClassElement) methodElement.getEnclosingElement();
+        // TODO(scheglov) we should use name with import prefix
+        String className = classElement.getName();
+        // replace "target" with class name
+        SourceRange range = SourceRangeFactory.create(invocation.getTarget());
+        textEdits.add(createReplaceEdit(range, className));
+        // add proposal
+        addUnitCorrectionProposal(
+            Messages.format(CorrectionMessages.QuickFixProcessor_useStaticAccess_method, className),
+            DartPluginImages.get(DartPluginImages.IMG_CORRECTION_CHANGE));
+      }
+    }
+  }
+
+  /**
+   * Adds new {@link CUCorrectionProposal} using {@link #unit} and {@link #textEdits}.
+   */
+  private void addUnitCorrectionProposal(String label, Image image) {
+    // prepare change
+    CompilationUnitChange change = new CompilationUnitChange(label, unit);
+    change.setEdit(new MultiTextEdit());
+    // add edits
+    for (TextEdit textEdit : textEdits) {
+      change.addEdit(textEdit);
+    }
+    // add proposal
+    if (!textEdits.isEmpty()) {
+      proposals.add(new CUCorrectionProposal(label, unit, change, 1, image));
+    }
+  }
+}