public ExtractMethodRefactoring(CompilationUnit unit, int selectionStart, int selectionLength) {
this.unit = unit;
this.selectionStart = selectionStart;
this.selectionLength = selectionLength;
this.selectionRange = SourceRangeFactory.forStartLength(selectionStart, selectionLength);
this.methodName = "extracted"; // $NON-NLS-1$
}
/**
* Checks if {@link #selectionRange} selects {@link DartExpression} or set of {@link
* DartStatement}s which can be extracted, and location in AST allows extracting.
*/
private RefactoringStatus checkSelection(IProgressMonitor pm) throws CoreException {
Selection selection = Selection.createFromStartLength(selectionStart, selectionLength);
selectionAnalyzer = new ExtractMethodAnalyzer(unit, selection);
unitNode.accept(selectionAnalyzer);
// may be fatal error
{
RefactoringStatus status = selectionAnalyzer.getStatus();
if (status.hasFatalError()) {
return status;
}
}
// update selection
selectionLength = selectionAnalyzer.getSelectionExclusiveEnd() - selectionStart;
selectionRange = SourceRangeFactory.forStartLength(selectionStart, selectionLength);
// check selected nodes
DartNode[] selectedNodes = selectionAnalyzer.getSelectedNodes();
if (selectedNodes.length > 0) {
parentMember =
ASTNodes.getParent(selectionAnalyzer.getLastCoveringNode(), DartClassMember.class);
// single expression selected
if (selectedNodes.length == 1
&& !utils.rangeIncludesNonWhitespaceOutsideNode(
selectionRange, selectionAnalyzer.getFirstSelectedNode())) {
DartNode selectedNode = selectionAnalyzer.getFirstSelectedNode();
if (selectedNode instanceof DartExpression) {
selectionExpression = (DartExpression) selectedNode;
return new RefactoringStatus();
}
}
// statements selected
{
List<DartStatement> selectedStatements = Lists.newArrayList();
for (DartNode selectedNode : selectedNodes) {
if (selectedNode instanceof DartStatement) {
selectedStatements.add((DartStatement) selectedNode);
}
}
if (selectedStatements.size() == selectedNodes.length) {
selectionStatements = selectedStatements;
return new RefactoringStatus();
}
}
}
// invalid selection
return RefactoringStatus.createFatalErrorStatus(
RefactoringCoreMessages.ExtractMethodAnalyzer_single_expression_or_set);
}