private SourcePattern getSourcePattern(final SourceRange partRange) {
String originalSource = utils.getText(partRange.getOffset(), partRange.getLength());
final SourcePattern pattern = new SourcePattern();
final List<ReplaceEdit> replaceEdits = Lists.newArrayList();
unitNode.accept(
new ASTVisitor<Void>() {
@Override
public Void visitIdentifier(DartIdentifier node) {
SourceRange nodeRange = SourceRangeFactory.create(node);
if (SourceRangeUtils.covers(partRange, nodeRange)) {
VariableElement variableElement = ASTNodes.getVariableOrParameterElement(node);
if (variableElement != null) {
String originalName = variableElement.getName();
String patternName = pattern.originalToPatternNames.get(originalName);
if (patternName == null) {
patternName = "__dartEditorVariable" + pattern.originalToPatternNames.size();
pattern.originalToPatternNames.put(originalName, patternName);
}
replaceEdits.add(
new ReplaceEdit(
nodeRange.getOffset() - partRange.getOffset(),
nodeRange.getLength(),
patternName));
}
}
return null;
}
});
pattern.patternSource = ExtractUtils.applyReplaceEdits(originalSource, replaceEdits);
return pattern;
}
@Override
public Void visitIdentifier(DartIdentifier node) {
if (foundElement == null) {
int start = node.getSourceInfo().getOffset();
int length = node.getSourceInfo().getLength();
int end = start + length;
if (start <= startOffset && endOffset <= end) {
wordRegion = new Region(start, length);
Element targetElement = DartAstUtilities.getElement(node, includeDeclarations);
if (targetElement == null) {
foundElement = null;
} else {
if (targetElement instanceof VariableElement) {
VariableElement variableElement = (VariableElement) targetElement;
resolvedElement = variableElement;
if (variableElement.getKind() == ElementKind.PARAMETER
|| variableElement.getKind() == ElementKind.VARIABLE) {
foundElement =
BindingUtils.getDartElement(compilationUnit.getLibrary(), variableElement);
candidateRegion =
new Region(
variableElement.getNameLocation().getOffset(),
variableElement.getNameLocation().getLength());
} else {
foundElement = null;
}
} else {
findElementFor(targetElement);
// Import prefix is resolved into LibraryElement, so it is correct that corresponding
// DartElement is DartLibrary, but this is not what we (and user) wants, because
// it looses information. We want DartImport, it gives both DartLibrary and name.
if (foundElement instanceof DartLibrary) {
try {
DartImport[] imports = compilationUnit.getLibrary().getImports();
for (DartImport imprt : imports) {
if (Objects.equal(imprt.getLibrary(), foundElement)
&& Objects.equal(imprt.getPrefix(), node.getName())) {
foundElement = imprt;
SourceRange range = imprt.getNameRange();
candidateRegion = new Region(range.getOffset(), range.getLength());
}
}
} catch (DartModelException e) {
DartCore.logError("Cannot resolve import " + foundElement.getElementName(), e);
}
}
}
}
throw new DartElementFoundException();
}
}
return null;
}
@Override
public Void visitImportDirective(DartImportDirective node) {
DartLibrary library = compilationUnit.getLibrary();
try {
if (Objects.equal(compilationUnit, library.getDefiningCompilationUnit())) {
DartImport[] imports = library.getImports();
for (DartImport imprt : imports) {
// on URI of library - return defining Unit of imported Library
SourceRange uriRange = imprt.getUriRange();
if (SourceRangeUtils.contains(uriRange, startOffset)) {
resolvedElement = null;
foundElement = imprt.getLibrary().getDefiningCompilationUnit();
wordRegion = new Region(uriRange.getOffset(), uriRange.getLength());
candidateRegion = new Region(0, 0);
throw new DartElementFoundException();
}
// on #import directive - return DartImport element
SourceRange sourceRange = imprt.getSourceRange();
if (SourceRangeUtils.contains(sourceRange, startOffset)) {
resolvedElement = null;
foundElement = imprt;
wordRegion = new Region(sourceRange.getOffset(), sourceRange.getLength());
candidateRegion = new Region(sourceRange.getOffset(), sourceRange.getLength());
throw new DartElementFoundException();
}
}
}
} catch (DartModelException e) {
DartCore.logError("Cannot access imports of " + library.getElementName(), e);
}
return super.visitImportDirective(node);
}
public final SourceRange getNewSelectionRange(SourceRange oldSourceRange, SourceReference sr) {
try {
DartUnit root = getAST(sr);
if (root == null) {
return oldSourceRange;
}
Selection selection =
Selection.createFromStartLength(oldSourceRange.getOffset(), oldSourceRange.getLength());
SelectionAnalyzer selAnalyzer = new SelectionAnalyzer(selection, true);
root.accept(selAnalyzer);
return internalGetNewSelectionRange(oldSourceRange, sr, selAnalyzer);
} catch (DartModelException e) {
DartToolsPlugin.log(e); // dialog would be too heavy here
return newSourceRange(oldSourceRange.getOffset(), oldSourceRange.getLength());
}
}
/*
* Method declared in IAction.
*/
@Override
public final void run() {
DartElement inputElement = EditorUtility.getEditorInputJavaElement(fEditor, false);
if (!(inputElement instanceof SourceReference && inputElement.exists())) {
return;
}
SourceReference source = (SourceReference) inputElement;
SourceRange sourceRange;
try {
sourceRange = source.getSourceRange();
if (sourceRange == null || sourceRange.getLength() == 0) {
MessageDialog.openInformation(
fEditor.getEditorSite().getShell(),
SelectionActionMessages.StructureSelect_error_title,
SelectionActionMessages.StructureSelect_error_message);
return;
}
} catch (DartModelException e) {
}
ITextSelection selection = getTextSelection();
SourceRange newRange = getNewSelectionRange(createSourceRange(selection), source);
// Check if new selection differs from current selection
if (selection.getOffset() == newRange.getOffset()
&& selection.getLength() == newRange.getLength()) {
return;
}
fSelectionHistory.remember(newSourceRange(selection.getOffset(), selection.getLength()));
try {
fSelectionHistory.ignoreSelectionChanges();
fEditor.selectAndReveal(newRange.getOffset(), newRange.getLength());
} finally {
fSelectionHistory.listenToSelectionChanges();
}
}
/** @return the selected {@link DartExpression} source, with applying new parameter names. */
private String getMethodBodySource() {
String source = utils.getText(selectionStart, selectionLength);
// prepare ReplaceEdit operators to replace variables with parameters
List<ReplaceEdit> replaceEdits = Lists.newArrayList();
for (Entry<String, List<SourceRange>> entry : selectionParametersToRanges.entrySet()) {
String name = entry.getKey();
for (ParameterInfo parameter : parameters) {
if (StringUtils.equals(name, parameter.getOldName())) {
for (SourceRange range : entry.getValue()) {
replaceEdits.add(
new ReplaceEdit(
range.getOffset() - selectionStart, range.getLength(), parameter.getNewName()));
}
}
}
}
// apply replacements
source = ExtractUtils.applyReplaceEdits(source, replaceEdits);
// change indentation
if (selectionStatements != null) {
String eol = utils.getEndOfLine();
String selectionIndent = utils.getNodePrefix(selectionStatements.get(0));
String targetIndent = utils.getNodePrefix(parentMember) + " ";
String[] lines = StringUtils.splitPreserveAllTokens(source, eol);
StringBuilder sb = new StringBuilder();
for (int i = 0; i < lines.length; i++) {
String line = lines[i];
line = targetIndent + StringUtils.removeStart(line, selectionIndent);
sb.append(line);
sb.append(eol);
}
source = sb.toString();
source = StringUtils.stripEnd(source, null);
source += eol;
}
// done
return source;
}
/**
* Given a compiler element representing some portion of the code base, set {@link #foundElement}
* to the editor model element that corresponds to it.
*
* @param targetSymbol the compiler element representing some portion of the code base
*/
private void findElementFor(Element targetSymbol) {
if (targetSymbol == null) {
return;
}
LibraryElement definingLibraryElement = BindingUtils.getLibrary(targetSymbol);
DartLibrary definingLibrary = null;
if (definingLibraryElement != null) {
definingLibrary =
BindingUtils.getDartElement(compilationUnit.getLibrary(), definingLibraryElement);
}
if (definingLibrary == null) {
definingLibrary = compilationUnit.getLibrary();
}
resolvedElement = targetSymbol;
foundElement = BindingUtils.getDartElement(definingLibrary, targetSymbol);
if (foundElement instanceof SourceReference) {
try {
SourceRange range = ((SourceReference) foundElement).getNameRange();
candidateRegion = new Region(range.getOffset(), range.getLength());
} catch (DartModelException exception) {
// Ignored
}
}
}
private static IRegion createRegion(SourceRange range) {
return new Region(range.getOffset(), range.getLength());
}
@Override
public Change createChange(IProgressMonitor pm) throws CoreException {
pm.beginTask("", 1 + occurrences.size()); // $NON-NLS-1$
try {
// configure Change
{
change = new CompilationUnitChange(unit.getElementName(), unit);
change.setEdit(new MultiTextEdit());
change.setKeepPreviewEdits(true);
}
// replace occurrences with method invocation
for (Occurrence occurence : occurrences) {
pm.worked(1);
SourceRange range = occurence.range;
// may be replacement of duplicates disabled
if (!replaceAllOccurrences && !occurence.isSelection) {
continue;
}
// prepare invocation source
String invocationSource;
{
StringBuilder sb = new StringBuilder();
// may be returns value
if (returnVariable != null) {
String varTypeName = ExtractUtils.getTypeSource(returnVariable.getType());
String originalName = returnVariable.getName();
String occurrenceName = occurence.parameterOldToOccurrenceName.get(originalName);
if (varTypeName.equals("dynamic")) {
sb.append("var ");
} else {
sb.append(varTypeName);
sb.append(" ");
}
sb.append(occurrenceName);
sb.append(" = ");
}
// invocation itself
sb.append(methodName);
sb.append("(");
boolean firstParameter = true;
for (ParameterInfo parameter : parameters) {
// may be comma
if (firstParameter) {
firstParameter = false;
} else {
sb.append(", ");
}
// argument name
{
String parameterOldName = parameter.getOldName();
String argumentName = occurence.parameterOldToOccurrenceName.get(parameterOldName);
sb.append(argumentName);
}
}
sb.append(")");
invocationSource = sb.toString();
// statements as extracted with their ";", so add new one after invocation
if (selectionStatements != null) {
invocationSource += ";";
}
}
// add replace edit
TextEdit edit = new ReplaceEdit(range.getOffset(), range.getLength(), invocationSource);
change.addEdit(edit);
String msg =
Messages.format(
occurence.isSelection
? RefactoringCoreMessages.ExtractMethodRefactoring_substitute_with_call
: RefactoringCoreMessages.ExtractMethodRefactoring_duplicates_single,
methodName);
change.addTextEditGroup(new TextEditGroup(msg, edit));
}
// add method declaration
{
// prepare environment
String prefix = utils.getNodePrefix(parentMember);
String eol = utils.getEndOfLine();
// prepare annotations
String annotations = "";
{
// may be "static"
if (staticContext) {
annotations = "static ";
}
}
// prepare declaration source
String declarationSource = null;
{
String returnExpressionSource = getMethodBodySource();
// expression
if (selectionExpression != null) {
// add return type
String returnTypeName = ExtractUtils.getTypeSource(selectionExpression);
if (returnTypeName != null && !returnTypeName.equals("dynamic")) {
annotations += returnTypeName + " ";
}
// just return expression
declarationSource =
annotations + getSignature() + " => " + returnExpressionSource + ";";
}
// statements
if (selectionStatements != null) {
if (returnVariable != null) {
String returnTypeName = ExtractUtils.getTypeSource(returnVariable.getType());
if (returnTypeName != null && !returnTypeName.equals("dynamic")) {
annotations += returnTypeName + " ";
}
} else {
annotations += "void ";
}
declarationSource = annotations + getSignature() + " {" + eol;
declarationSource += returnExpressionSource;
if (returnVariable != null) {
declarationSource += prefix + " return " + returnVariable.getName() + ";" + eol;
}
declarationSource += prefix + "}";
}
}
// insert declaration
if (declarationSource != null) {
int offset = parentMember.getSourceInfo().getEnd();
TextEdit edit = new ReplaceEdit(offset, 0, eol + eol + prefix + declarationSource);
change.addEdit(edit);
change.addTextEditGroup(
new TextEditGroup(
Messages.format(
selectionExpression != null
? RefactoringCoreMessages.ExtractMethodRefactoring_add_method_expression
: RefactoringCoreMessages.ExtractMethodRefactoring_add_method,
methodName),
edit));
}
}
pm.worked(1);
// done
return change;
} finally {
pm.done();
}
}