private Expression ParseLambdaHelperEnd(FunctionDefinition func, Expression expr, string whitespace, string colonWhiteSpace, List<string> commaWhiteSpace, bool ateTerminator) {
// Pep 342 in Python 2.5 allows Yield Expressions, which can occur inside a Lambda body.
// In this case, the lambda is a generator and will yield it's final result instead of just return it.
Statement body;
if (func.IsGenerator) {
YieldExpression y = new YieldExpression(expr);
y.SetLoc(expr.IndexSpan);
body = new ExpressionStatement(y);
} else {
body = new ReturnStatement(expr);
}
body.SetLoc(expr.StartIndex, expr.EndIndex);
FunctionDefinition func2 = PopFunction();
System.Diagnostics.Debug.Assert(func == func2);
func.SetBody(body);
func.EndIndex = GetEnd();
LambdaExpression ret = new LambdaExpression(func);
func.SetLoc(func.IndexSpan);
ret.SetLoc(func.IndexSpan);
if (_verbatim) {
AddPreceedingWhiteSpace(ret, whitespace);
AddSecondPreceedingWhiteSpace(ret, colonWhiteSpace);
AddListWhiteSpace(ret, commaWhiteSpace.ToArray());
if (!ateTerminator) {
AddErrorIsIncompleteNode(ret);
}
}
return ret;
}
// funcdef: [decorators] 'def' NAME parameters ':' suite
// parameters: '(' [varargslist] ')'
// this gets called with "def" as the look-ahead
private FunctionDefinition ParseFuncDef(bool isCoroutine) {
string preWhitespace = null, afterAsyncWhitespace = null;
var start = isCoroutine ? GetStart() : 0;
if (isCoroutine) {
preWhitespace = _tokenWhiteSpace;
}
Eat(TokenKind.KeywordDef);
if (isCoroutine) {
afterAsyncWhitespace = _tokenWhiteSpace;
} else {
preWhitespace = _tokenWhiteSpace;
start = GetStart();
}
var name = ReadName();
var nameExpr = MakeName(name);
nameExpr.SetLoc(GetStart(), GetEnd());
string nameWhiteSpace = _tokenWhiteSpace;
bool ateLeftParen = name.HasName && Eat(TokenKind.LeftParenthesis);
string parenWhiteSpace = _tokenWhiteSpace;
var lStart = GetStart();
var lEnd = GetEnd();
int grouping = _tokenizer.GroupingLevel;
List<string> commaWhiteSpace = null;
bool ateTerminator = false;
Parameter[] parameters = ateLeftParen ? ParseVarArgsList(TokenKind.RightParenthesis, out commaWhiteSpace, out ateTerminator, true) : null;
string closeParenWhiteSpace = _tokenWhiteSpace;
FunctionDefinition ret;
if (parameters == null) {
// error in parameters
ret = new FunctionDefinition(nameExpr, new Parameter[0]);
ret.IsCoroutine = isCoroutine;
if (_verbatim) {
AddVerbatimName(name, ret);
AddPreceedingWhiteSpace(ret, preWhitespace);
if (afterAsyncWhitespace != null) {
GetNodeAttributes(ret)[FunctionDefinition.WhitespaceAfterAsync] = afterAsyncWhitespace;
}
AddSecondPreceedingWhiteSpace(ret, nameWhiteSpace);
AddThirdPreceedingWhiteSpace(ret, parenWhiteSpace);
AddFourthPreceedingWhiteSpace(ret, closeParenWhiteSpace);
if (!ateTerminator) {
AddErrorMissingCloseGrouping(ret);
}
if (!ateLeftParen) {
AddErrorIsIncompleteNode(ret);
}
}
ret.SetLoc(start, lEnd);
return ret;
}
string arrowWhiteSpace = null;
Expression returnAnnotation = null;
if (MaybeEat(TokenKind.Arrow)) {
arrowWhiteSpace = _tokenWhiteSpace;
returnAnnotation = ParseExpression();
}
var rStart = GetStart();
var rEnd = GetEnd();
ret = new FunctionDefinition(nameExpr, parameters);
AddVerbatimName(name, ret);
PushFunction(ret);
// set IsCoroutine before parsing the body to enable use of 'await'
ret.IsCoroutine = isCoroutine;
Statement body = ParseClassOrFuncBody();
FunctionDefinition ret2 = PopFunction();
System.Diagnostics.Debug.Assert(ret == ret2);
ret.SetBody(body);
ret.ReturnAnnotation = returnAnnotation;
ret.HeaderIndex = rEnd;
if (_verbatim) {
AddPreceedingWhiteSpace(ret, preWhitespace);
if (afterAsyncWhitespace != null) {
GetNodeAttributes(ret)[FunctionDefinition.WhitespaceAfterAsync] = afterAsyncWhitespace;
}
AddSecondPreceedingWhiteSpace(ret, nameWhiteSpace);
AddThirdPreceedingWhiteSpace(ret, parenWhiteSpace);
AddFourthPreceedingWhiteSpace(ret, closeParenWhiteSpace);
AddListWhiteSpace(ret, commaWhiteSpace.ToArray());
if (arrowWhiteSpace != null) {
AddFifthPreceedingWhiteSpace(ret, arrowWhiteSpace);
}
if (!ateTerminator) {
AddErrorMissingCloseGrouping(ret);
}
}
ret.SetLoc(start, body.EndIndex);
return ret;
}