public FilePreviewItem(PreviewChangesEngine engine, string file)
{
Filename = file;
_engine = engine;
do {
_tempFileName = Path.Combine(Path.GetTempPath(), Path.GetRandomFileName()) + ".py";
} while (File.Exists(_tempFileName));
}
public BufferUpdater(ITextBuffer buffer, PreviewChangesEngine engine)
{
_buffer = buffer;
_engine = engine;
}
public void RenameVariable(IRenameVariableInput input, IVsPreviewChangesService previewChanges)
{
if (IsModuleName(input)) {
input.CannotRename("Cannot rename a module name");
return;
}
var analysis = _view.GetExpressionAnalysis();
string originalName = null;
string privatePrefix = null;
Expression expr = null;
if (analysis != ExpressionAnalysis.Empty) {
JAst ast = analysis.GetEvaluatedAst();
expr = Statement.GetExpression(ast.Body);
NameExpression ne = expr as NameExpression;
MemberExpression me;
if (ne != null) {
originalName = ne.Name;
} else if ((me = expr as MemberExpression) != null) {
originalName = me.Name;
}
if (ast.PrivatePrefix != null && originalName.StartsWith("_" + ast.PrivatePrefix)) {
originalName = originalName.Substring(ast.PrivatePrefix.Length + 1);
privatePrefix = ast.PrivatePrefix;
}
if (originalName != null && _view.Selection.IsActive && !_view.Selection.IsEmpty) {
if (_view.Selection.Start.Position < analysis.Span.GetStartPoint(_view.TextBuffer.CurrentSnapshot) ||
_view.Selection.End.Position > analysis.Span.GetEndPoint(_view.TextBuffer.CurrentSnapshot)) {
originalName = null;
}
}
}
if (originalName == null) {
input.CannotRename("Please select a symbol to be renamed.");
return;
}
bool hasVariables = false;
foreach (var variable in analysis.Variables) {
if (variable.Type == VariableType.Definition || variable.Type == VariableType.Reference) {
hasVariables = true;
break;
}
}
IEnumerable<IAnalysisVariable> variables;
if (!hasVariables) {
List<IAnalysisVariable> paramVars = GetKeywordParameters(expr, originalName);
if (paramVars.Count == 0) {
input.CannotRename(string.Format("No information is available for the variable '{0}'.", originalName));
return;
}
variables = paramVars;
} else {
variables = analysis.Variables;
}
var info = input.GetRenameInfo(originalName);
if (info != null) {
var engine = new PreviewChangesEngine(input, analysis, info, originalName, privatePrefix, _view.GetAnalyzer(), variables);
if (info.Preview) {
previewChanges.PreviewChanges(engine);
} else {
ErrorHandler.ThrowOnFailure(engine.ApplyChanges());
}
}
}