public ExtractMethodResult GetExtractionResult(ExtractMethodRequest info)
{
bool isStaticMethod = false, isClassMethod = false;
var parameters = new List <Parameter>();
string selfParam = null;
if (info.TargetScope is ClassDefinition)
{
var fromScope = _scopes[_scopes.Length - 1] as FunctionDefinition;
Debug.Assert(fromScope != null); // we don't allow extracting from classes, so we have to be coming from a function
if (fromScope != null)
{
if (fromScope.Decorators != null)
{
foreach (var decorator in fromScope.Decorators.Decorators)
{
NameExpression name = decorator as NameExpression;
if (name != null)
{
if (name.Name == "staticmethod")
{
isStaticMethod = true;
}
else if (name.Name == "classmethod")
{
isClassMethod = true;
}
}
}
}
if (!isStaticMethod)
{
if (fromScope.Parameters.Count > 0)
{
selfParam = fromScope.Parameters[0].Name;
parameters.Add(new Parameter(selfParam, ParameterKind.Normal));
}
}
}
}
foreach (var param in info.Parameters)
{
var newParam = new Parameter(param, ParameterKind.Normal);
if (parameters.Count > 0)
{
newParam.AddPreceedingWhiteSpace(_ast, " ");
}
parameters.Add(newParam);
}
// include any non-closed over parameters as well...
foreach (var input in _inputVars)
{
var variableScope = input.Scope;
var parentScope = info.TargetScope;
// are these variables a child of the target scope so we can close over them?
while (parentScope != null && parentScope != variableScope)
{
parentScope = parentScope.Parent;
}
if (parentScope == null && input.Name != selfParam)
{
// we can either close over or pass these in as parameters, add them to the list
var newParam = new Parameter(input.Name, ParameterKind.Normal);
if (parameters.Count > 0)
{
newParam.AddPreceedingWhiteSpace(_ast, " ");
}
parameters.Add(newParam);
}
}
var body = _target.GetBody(_ast);
var isCoroutine = IsCoroutine(body);
// reset leading indentation to single newline + indentation, this
// strips out any proceeding comments which we don't extract
var leading = _newline + body.GetIndentationLevel(_ast);
body.SetLeadingWhiteSpace(_ast, leading);
if (_outputVars.Count > 0)
{
// need to add a return statement
Expression retValue;
Expression[] names = new Expression[_outputVars.Count];
int outputIndex = 0;
foreach (var name in _outputVars)
{
var nameExpr = new NameExpression(name.Name);
nameExpr.AddPreceedingWhiteSpace(_ast, " ");
names[outputIndex++] = nameExpr;
}
var tuple = new TupleExpression(false, names);
tuple.RoundTripHasNoParenthesis(_ast);
retValue = tuple;
var retStmt = new ReturnStatement(retValue);
retStmt.SetLeadingWhiteSpace(_ast, leading);
body = new SuiteStatement(
new Statement[] {
body,
retStmt
}
);
}
else
{
// we need a SuiteStatement to give us our colon
body = new SuiteStatement(new Statement[] { body });
}
DecoratorStatement decorators = null;
if (isStaticMethod)
{
decorators = new DecoratorStatement(new[] { new NameExpression("staticmethod") });
}
else if (isClassMethod)
{
decorators = new DecoratorStatement(new[] { new NameExpression("classmethod") });
}
var res = new FunctionDefinition(new NameExpression(info.Name), parameters.ToArray(), body, decorators);
res.IsCoroutine = isCoroutine;
StringBuilder newCall = new StringBuilder();
newCall.Append(_target.IndentationLevel);
var method = res.ToCodeString(_ast);
// fix up indentation...
for (int curScope = 0; curScope < _scopes.Length; curScope++)
{
if (_scopes[curScope] == info.TargetScope)
{
// this is our target indentation level.
var indentationLevel = _scopes[curScope].Body.GetIndentationLevel(_ast);
var lines = method.Split(new[] { "\r\n", "\r", "\n" }, StringSplitOptions.None);
int minWhiteSpace = Int32.MaxValue;
for (int curLine = decorators == null ? 1 : 2; curLine < lines.Length; curLine++)
{
var line = lines[curLine];
for (int i = 0; i < line.Length; i++)
{
if (!Char.IsWhiteSpace(line[i]))
{
minWhiteSpace = Math.Min(minWhiteSpace, i);
break;
}
}
}
StringBuilder newLines = new StringBuilder();
newLines.Append(indentationLevel);
newLines.Append(lines[0]);
if (decorators != null)
{
newLines.Append(_newline);
newLines.Append(indentationLevel);
newLines.Append(lines[1]);
}
// don't include a bunch of blank lines...
int endLine = lines.Length - 1;
for (; endLine >= 0 && String.IsNullOrWhiteSpace(lines[endLine]); endLine--)
{
}
newLines.Append(_newline);
for (int curLine = decorators == null ? 1 : 2; curLine <= endLine; curLine++)
{
var line = lines[curLine];
newLines.Append(indentationLevel);
if (_insertTabs)
{
newLines.Append('\t');
}
else
{
newLines.Append(' ', _indentSize);
}
if (line.Length > minWhiteSpace)
{
newLines.Append(line, minWhiteSpace, line.Length - minWhiteSpace);
}
newLines.Append(_newline);
}
newLines.Append(_newline);
method = newLines.ToString();
break;
}
}
string comma;
if (_outputVars.Count > 0)
{
comma = "";
foreach (var outputVar in _outputVars)
{
newCall.Append(comma);
newCall.Append(outputVar.Name);
comma = ", ";
}
newCall.Append(" = ");
}
else if (_target.ContainsReturn)
{
newCall.Append("return ");
}
if (isCoroutine)
{
newCall.Append("await ");
}
if (info.TargetScope is ClassDefinition)
{
var fromScope = _scopes[_scopes.Length - 1] as FunctionDefinition;
Debug.Assert(fromScope != null); // we don't allow extracting from classes, so we have to be coming from a function
if (isStaticMethod)
{
newCall.Append(info.TargetScope.Name);
newCall.Append('.');
}
else if (fromScope != null && fromScope.Parameters.Count > 0)
{
newCall.Append(fromScope.Parameters[0].Name);
newCall.Append('.');
}
}
newCall.Append(info.Name);
newCall.Append('(');
comma = "";
foreach (var param in parameters)
{
if (param.Name != selfParam)
{
newCall.Append(comma);
newCall.Append(param.Name);
comma = ", ";
}
}
newCall.Append(')');
return(new ExtractMethodResult(
method,
newCall.ToString()
));
}
