public FunctionDefinition(NameExpression name, Parameter[] parameters, Statement body, DecoratorStatement decorators = null)
{
if (name == null) {
_name = new NameExpression("<lambda>");
_isLambda = true;
} else {
_name = name;
}
_parameters = parameters;
_body = body;
_decorators = decorators;
}
// decorators ::=
// decorator+
// decorator ::=
// "@" dotted_name ["(" [argument_list [","]] ")"] NEWLINE
private DecoratorStatement ParseDecorators(out List<string> newlineWhiteSpace)
{
List<Expression> decorators = new List<Expression>();
newlineWhiteSpace = MakeWhiteSpaceList();
Eat(TokenKind.At);
var decStart = GetStart();
do {
if (newlineWhiteSpace != null) {
newlineWhiteSpace.Add(_tokenWhiteSpace);
}
var start = GetStart();
var name = ReadName();
Expression decorator = MakeName(name);
if (!name.HasName) {
decorators.Add(null);
continue;
}
if (_verbatim) {
AddPreceedingWhiteSpace(decorator, _tokenWhiteSpace);
}
decorator.SetLoc(GetStart(), GetEnd());
while (MaybeEat(TokenKind.Dot)) {
string whitespace = _tokenWhiteSpace;
name = ReadNameMaybeNone();
if (!name.HasName) {
decorator = Error(_verbatim ? (_tokenWhiteSpace + _token.Token.VerbatimImage + _lookaheadWhiteSpace + _lookahead.Token.VerbatimImage) : null, decorator);
NextToken();
} else {
string nameWhitespace = _tokenWhiteSpace;
var memberDecorator = MakeMember(decorator, name);
memberDecorator.SetLoc(start, GetStart(), GetEnd());
if (_verbatim) {
AddPreceedingWhiteSpace(memberDecorator, whitespace);
AddSecondPreceedingWhiteSpace(memberDecorator, nameWhitespace);
}
decorator = memberDecorator;
}
}
if (MaybeEat(TokenKind.LeftParenthesis)) {
string parenWhiteSpace = _tokenWhiteSpace;
var commaWhiteSpace = MakeWhiteSpaceList();
bool ateTerminator;
Arg[] args = FinishArgumentList(null, commaWhiteSpace, out ateTerminator);
decorator = FinishCallExpr(decorator, args);
if (_verbatim) {
AddPreceedingWhiteSpace(decorator, parenWhiteSpace);
AddSecondPreceedingWhiteSpace(decorator, _tokenWhiteSpace);
if (commaWhiteSpace != null) {
AddListWhiteSpace(decorator, commaWhiteSpace.ToArray());
}
if (!ateTerminator) {
AddErrorMissingCloseGrouping(decorator);
}
}
decorator.SetLoc(start, GetEnd());
}
string newline;
EatNewLine(out newline);
if (newlineWhiteSpace != null) {
newlineWhiteSpace.Add(newline);
}
decorators.Add(decorator);
} while (MaybeEat(TokenKind.At));
var res = new DecoratorStatement(decorators.ToArray());
res.SetLoc(decStart, GetEnd());
return res;
}
// DecoratorStatement
public override bool Walk(DecoratorStatement node)
{
return ShouldWalkWorker(node);
}
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.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);
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);
if (body is SuiteStatement) {
SuiteStatement suite = (SuiteStatement)body;
Node.CopyLeadingWhiteSpace(_ast, suite.Statements[0], retStmt);
Node.CopyTrailingNewLine(_ast, suite.Statements[0], suite.Statements[suite.Statements.Count - 1]);
Statement[] statements = new Statement[suite.Statements.Count + 1];
for (int i = 0; i < suite.Statements.Count; i++) {
statements[i] = suite.Statements[i];
}
statements[statements.Length - 1] = retStmt;
body = new SuiteStatement(statements);
} else {
Node.CopyLeadingWhiteSpace(_ast, body, retStmt);
body = new SuiteStatement(
new Statement[] {
body,
retStmt
}
);
}
}
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);
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("\r\n");
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("\r\n");
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("\r\n");
}
newLines.Append("\r\n");
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 (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.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()
);
}
public override void PostWalk(DecoratorStatement node)
{
PostWalkWorker(node);
}