internal void RemoveImports() {
ScopeStatement targetStmt = null;
if (!_allScopes) {
var enclosingNodeWalker = new EnclosingNodeWalker(_ast, _view.Caret.Position.BufferPosition, _view.Caret.Position.BufferPosition);
_ast.Walk(enclosingNodeWalker);
targetStmt = enclosingNodeWalker.Target.Parents[enclosingNodeWalker.Target.Parents.Length - 1];
}
var walker = new ImportWalker(targetStmt);
_ast.Walk(walker);
using (var edit = _view.TextBuffer.CreateEdit()) {
foreach (var removeInfo in walker.GetToRemove()) {
// see if we're removing some or all of the
//var node = removeInfo.Node;
var removing = removeInfo.ToRemove;
var removed = removeInfo.Statement;
UpdatedStatement updatedStatement = removed.InitialStatement;
int removeCount = 0;
for (int i = 0, curRemoveIndex = 0; i < removed.NameCount; i++) {
if (removed.IsRemoved(i, removing)) {
removeCount++;
updatedStatement = updatedStatement.RemoveName(_ast, curRemoveIndex);
} else {
curRemoveIndex++;
}
}
var span = removed.Node.GetSpan(_ast);
if (removeCount == removed.NameCount) {
removeInfo.SiblingCount.Value--;
DeleteStatement(edit, span, removeInfo.SiblingCount.Value == 0);
} else {
var newCode = updatedStatement.ToCodeString(_ast);
int proceedingLength = (removed.Node.GetLeadingWhiteSpace(_ast) ?? "").Length;
int start = span.Start.Index - proceedingLength;
int length = span.Length + proceedingLength;
edit.Delete(start, length);
edit.Insert(span.Start.Index, newCode);
}
}
edit.Apply();
}
}
public void FormatCode(SnapshotSpan span, bool selectResult)
{
var snapshot = _view.TextBuffer.CurrentSnapshot;
var ast = _view.GetAnalyzer(_serviceProvider).ParseSnapshot(snapshot);
var walker = new EnclosingNodeWalker(ast, span.Start, span.End);
ast.Walk(walker);
if (walker.Target == null ||
!walker.Target.IsValidSelection ||
(walker.Target is SuiteTarget && _view.Selection.IsEmpty && selectResult))
{
return;
}
var body = walker.Target.GetNode(ast);
// remove any leading comments before round tripping, not selecting them
// gives a nicer overall experience, otherwise we have a selection to the
// previous line which only covers white space.
body.SetLeadingWhiteSpace(ast, body.GetIndentationLevel(ast));
ITrackingSpan selectionSpan = null;
if (selectResult)
{
selectionSpan = _view.TextBuffer.CurrentSnapshot.CreateTrackingSpan(
Span.FromBounds(walker.Target.StartIncludingIndentation, walker.Target.End),
SpanTrackingMode.EdgeInclusive
);
}
_view.ReplaceByLines(
body.ToCodeString(ast, _format),
Span.FromBounds(walker.Target.StartIncludingIndentation, walker.Target.End)
);
if (selectResult)
{
_view.Selection.Select(selectionSpan.GetSpan(_view.TextBuffer.CurrentSnapshot), false);
}
}
public void FormatCode(SnapshotSpan span, bool selectResult) {
var snapshot = _view.TextBuffer.CurrentSnapshot;
var ast = _view.GetAnalyzer(_serviceProvider).ParseSnapshot(snapshot);
var walker = new EnclosingNodeWalker(ast, span.Start, span.End);
ast.Walk(walker);
if (walker.Target == null ||
!walker.Target.IsValidSelection ||
(walker.Target is SuiteTarget && _view.Selection.IsEmpty && selectResult)) {
return;
}
var body = walker.Target.GetNode(ast);
// remove any leading comments before round tripping, not selecting them
// gives a nicer overall experience, otherwise we have a selection to the
// previous line which only covers white space.
body.SetLeadingWhiteSpace(ast, body.GetIndentationLevel(ast));
ITrackingSpan selectionSpan = null;
if (selectResult) {
selectionSpan = _view.TextBuffer.CurrentSnapshot.CreateTrackingSpan(
Span.FromBounds(walker.Target.StartIncludingIndentation, walker.Target.End),
SpanTrackingMode.EdgeInclusive
);
}
_view.ReplaceByLines(
body.ToCodeString(ast, _format),
Span.FromBounds(walker.Target.StartIncludingIndentation, walker.Target.End)
);
if (selectResult) {
_view.Selection.Select(selectionSpan.GetSpan(_view.TextBuffer.CurrentSnapshot), false);
}
}
internal void RemoveImports()
{
ScopeStatement targetStmt = null;
if (!_allScopes)
{
var enclosingNodeWalker = new EnclosingNodeWalker(_ast, _view.Caret.Position.BufferPosition, _view.Caret.Position.BufferPosition);
_ast.Walk(enclosingNodeWalker);
targetStmt = enclosingNodeWalker.Target.Parents[enclosingNodeWalker.Target.Parents.Length - 1];
}
var walker = new ImportWalker(targetStmt);
_ast.Walk(walker);
using (var edit = _view.TextBuffer.CreateEdit()) {
foreach (var removeInfo in walker.GetToRemove())
{
// see if we're removing some or all of the
//var node = removeInfo.Node;
var removing = removeInfo.ToRemove;
var removed = removeInfo.Statement;
UpdatedStatement updatedStatement = removed.InitialStatement;
int removeCount = 0;
for (int i = 0, curRemoveIndex = 0; i < removed.NameCount; i++)
{
if (removed.IsRemoved(i, removing))
{
removeCount++;
updatedStatement = updatedStatement.RemoveName(_ast, curRemoveIndex);
}
else
{
curRemoveIndex++;
}
}
var span = removed.Node.GetSpan(_ast);
if (removeCount == removed.NameCount)
{
removeInfo.SiblingCount.Value--;
DeleteStatement(edit, span, removeInfo.SiblingCount.Value == 0);
}
else
{
var newCode = updatedStatement.ToCodeString(_ast);
int proceedingLength = (removed.Node.GetLeadingWhiteSpace(_ast) ?? "").Length;
int start = span.Start.Index - proceedingLength;
int length = span.Length + proceedingLength;
edit.Delete(start, length);
edit.Insert(span.Start.Index, newCode);
}
}
edit.Apply();
}
}
public bool ExtractMethod(IExtractMethodInput input) {
// tighten up the selection so that we don't expand into any enclosing nodes because we overlap w/ their white space...
var selectionStart = _view.Selection.Start.Position;
while (selectionStart.Position < _view.TextBuffer.CurrentSnapshot.Length && Char.IsWhiteSpace(selectionStart.GetChar())) {
selectionStart += 1;
}
var selectionEnd = _view.Selection.End.Position;
if (selectionEnd.Position == _view.TextBuffer.CurrentSnapshot.Length) {
selectionEnd -= 1;
}
while (selectionEnd.Position >= 0 && Char.IsWhiteSpace(selectionEnd.GetChar())) {
selectionEnd -= 1;
}
var walker = new EnclosingNodeWalker(_ast, selectionStart, selectionEnd);
_ast.Walk(walker);
Debug.Assert(walker.Target != null);
if (walker.Target == null) {
return false;
}
// expand the selection if we aren't currently covering a full expression/statement
if (!walker.Target.IsValidSelection ||
(WasSelectionExpanded(walker.Target, selectionStart, selectionEnd) && !input.ShouldExpandSelection())) {
return false;
}
_view.Selection.Select(
new SnapshotSpan(
_view.TextBuffer.CurrentSnapshot,
Span.FromBounds(
walker.Target.StartIncludingIndentation,
walker.Target.End
)
),
false
);
// check for things we cannot handle
if (!IsValidExtraction(input, walker.Target)) {
return false;
}
// get the variables which are read by the selected statement(s)
var varCollector = new InnerVariableWalker(_ast);
walker.Target.Walk(varCollector);
// Walk the target to understand flow control and definite assignment to further understand
// what we need to flow in. For example if a variable is assigned to both in the un-extracted
// and extracted code but it's definitely assigned in the extracted code then we don't need
// to flow the variable in.
// Run flow checker, first on any nested scopes...
foreach (ScopeStatement scope in varCollector._scopes) {
FlowChecker.Check(scope);
}
// then on our extracted code
var parent = walker.Target.Parents[walker.Target.Parents.Length - 1];
HashSet<PythonVariable> readBeforeInit;
FlowChecker extractedChecker = null;
if (parent.ScopeVariables != null) {
extractedChecker = new FlowChecker(parent);
walker.Target.Walk(extractedChecker);
readBeforeInit = extractedChecker.ReadBeforeInitializedVariables;
} else {
readBeforeInit = new HashSet<PythonVariable>();
}
// then on code which follows our extracted body
var afterStmts = walker.Target.GetStatementsAfter(_ast);
HashSet<PythonVariable> readByFollowingCodeBeforeInit = null;
var parentNode = walker.Target.Parents[walker.Target.Parents.Length - 1];
var outputVars = new HashSet<PythonVariable>();
if (parentNode.ScopeVariables != null) {
var checker = new FlowChecker(parentNode);
foreach (var afterStmt in afterStmts) {
afterStmt.Walk(checker);
}
readByFollowingCodeBeforeInit = checker.ReadBeforeInitializedVariables;
foreach (var variable in varCollector._allWrittenVariables) {
if (variable != null && variable.Scope is PythonAst) {
// global variable assigned to in outer scope, and left with
// a valid value (not deleted) from the extracted code. We
// need to pass the value back out and assign to it in the
// global scope.
if (!checker.IsInitialized(variable) &&
extractedChecker.IsAssigned(variable)) {
outputVars.Add(variable);
}
}
}
}
// collect any nested scopes, and see if they read any free variables
var scopeCollector = new ScopeCollector();
foreach (var afterStmt in afterStmts) {
afterStmt.Walk(scopeCollector);
}
foreach (var scope in scopeCollector._scopes) {
if (scope.FreeVariables != null) {
foreach (var freeVar in scope.FreeVariables) {
if (varCollector._allWrittenVariables.Contains(freeVar)) {
// we've assigned to a variable accessed from an inner
// scope, we need to get the value of the variable back out.
outputVars.Add(freeVar);
}
}
}
}
// discover any variables which are consumed and need to be available as outputs...
var outputCollector = new OuterVariableWalker(_ast, walker.Target, varCollector, readBeforeInit, readByFollowingCodeBeforeInit, outputVars);
_ast.Walk(outputCollector);
if (outputCollector._outputVars.Count > 0 &&
walker.Target.ContainsReturn) {
input.CannotExtract("Cannot extract method that assigns to variables and returns");
return false;
}
var creator = new ExtractedMethodCreator(
_ast,
walker.Target.Parents,
outputCollector._inputVars,
outputCollector._outputVars,
walker.Target,
_view.Options.GetIndentSize(),
!_view.Options.IsConvertTabsToSpacesEnabled(),
_view.Options.GetNewLineCharacter()
);
var info = input.GetExtractionInfo(creator);
if (info == null) {
// user cancelled extract method
return false;
}
// get the new method body...
var newMethod = creator.GetExtractionResult(info);
// generate the call site.
using (var edit = _view.TextBuffer.CreateEdit()) {
// delete the selected code
int start = _view.Selection.Start.Position;
edit.Delete(Span.FromBounds(_view.Selection.Start.Position, _view.Selection.End.Position));
// insert the newly generated method
edit.Insert(walker.Target.InsertLocations[info.TargetScope], newMethod.Method);
// insert the call to the new method
edit.Insert(start, newMethod.Call);
edit.Apply();
}
return true;
}
public bool ExtractMethod(IExtractMethodInput input)
{
// tighten up the selection so that we don't expand into any enclosing nodes because we overlap w/ their white space...
var selectionStart = _view.Selection.Start.Position;
while (selectionStart.Position < _view.TextBuffer.CurrentSnapshot.Length && Char.IsWhiteSpace(selectionStart.GetChar()))
{
selectionStart += 1;
}
var selectionEnd = _view.Selection.End.Position;
if (selectionEnd.Position == _view.TextBuffer.CurrentSnapshot.Length)
{
selectionEnd -= 1;
}
while (selectionEnd.Position >= 0 && Char.IsWhiteSpace(selectionEnd.GetChar()))
{
selectionEnd -= 1;
}
var walker = new EnclosingNodeWalker(_ast, selectionStart, selectionEnd);
_ast.Walk(walker);
Debug.Assert(walker.Target != null);
if (walker.Target == null)
{
return(false);
}
// expand the selection if we aren't currently covering a full expression/statement
if (!walker.Target.IsValidSelection ||
(WasSelectionExpanded(walker.Target, selectionStart, selectionEnd) && !input.ShouldExpandSelection()))
{
return(false);
}
_view.Selection.Select(
new SnapshotSpan(
_view.TextBuffer.CurrentSnapshot,
Span.FromBounds(
walker.Target.StartIncludingIndentation,
walker.Target.End
)
),
false
);
// check for things we cannot handle
if (!IsValidExtraction(input, walker.Target))
{
return(false);
}
// get the variables which are read by the selected statement(s)
var varCollector = new InnerVariableWalker(_ast);
walker.Target.Walk(varCollector);
// Walk the target to understand flow control and definite assignment to further understand
// what we need to flow in. For example if a variable is assigned to both in the un-extracted
// and extracted code but it's definitely assigned in the extracted code then we don't need
// to flow the variable in.
// Run flow checker, first on any nested scopes...
foreach (ScopeStatement scope in varCollector._scopes)
{
FlowChecker.Check(scope);
}
// then on our extracted code
var parent = walker.Target.Parents[walker.Target.Parents.Length - 1];
HashSet <PythonVariable> readBeforeInit;
FlowChecker extractedChecker = null;
if (parent.ScopeVariables != null)
{
extractedChecker = new FlowChecker(parent);
walker.Target.Walk(extractedChecker);
readBeforeInit = extractedChecker.ReadBeforeInitializedVariables;
}
else
{
readBeforeInit = new HashSet <PythonVariable>();
}
// then on code which follows our extracted body
var afterStmts = walker.Target.GetStatementsAfter(_ast);
HashSet <PythonVariable> readByFollowingCodeBeforeInit = null;
var parentNode = walker.Target.Parents[walker.Target.Parents.Length - 1];
var outputVars = new HashSet <PythonVariable>();
if (parentNode.ScopeVariables != null)
{
var checker = new FlowChecker(parentNode);
foreach (var afterStmt in afterStmts)
{
afterStmt.Walk(checker);
}
readByFollowingCodeBeforeInit = checker.ReadBeforeInitializedVariables;
foreach (var variable in varCollector._allWrittenVariables)
{
if (variable != null && variable.Scope is PythonAst)
{
// global variable assigned to in outer scope, and left with
// a valid value (not deleted) from the extracted code. We
// need to pass the value back out and assign to it in the
// global scope.
if (!checker.IsInitialized(variable) &&
extractedChecker.IsAssigned(variable))
{
outputVars.Add(variable);
}
}
}
}
// collect any nested scopes, and see if they read any free variables
var scopeCollector = new ScopeCollector();
foreach (var afterStmt in afterStmts)
{
afterStmt.Walk(scopeCollector);
}
foreach (var scope in scopeCollector._scopes)
{
if (scope.FreeVariables != null)
{
foreach (var freeVar in scope.FreeVariables)
{
if (varCollector._allWrittenVariables.Contains(freeVar))
{
// we've assigned to a variable accessed from an inner
// scope, we need to get the value of the variable back out.
outputVars.Add(freeVar);
}
}
}
}
// discover any variables which are consumed and need to be available as outputs...
var outputCollector = new OuterVariableWalker(_ast, walker.Target, varCollector, readBeforeInit, readByFollowingCodeBeforeInit, outputVars);
_ast.Walk(outputCollector);
if (outputCollector._outputVars.Count > 0 &&
walker.Target.ContainsReturn)
{
input.CannotExtract("Cannot extract method that assigns to variables and returns");
return(false);
}
var creator = new ExtractedMethodCreator(
_ast,
walker.Target.Parents,
outputCollector._inputVars,
outputCollector._outputVars,
walker.Target,
_view.Options.GetIndentSize(),
!_view.Options.IsConvertTabsToSpacesEnabled(),
_view.Options.GetNewLineCharacter()
);
var info = input.GetExtractionInfo(creator);
if (info == null)
{
// user cancelled extract method
return(false);
}
// get the new method body...
var newMethod = creator.GetExtractionResult(info);
// generate the call site.
using (var edit = _view.TextBuffer.CreateEdit()) {
// delete the selected code
int start = _view.Selection.Start.Position;
edit.Delete(Span.FromBounds(_view.Selection.Start.Position, _view.Selection.End.Position));
// insert the newly generated method
edit.Insert(walker.Target.InsertLocations[info.TargetScope], newMethod.Method);
// insert the call to the new method
edit.Insert(start, newMethod.Call);
edit.Apply();
}
return(true);
}
