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Fix Parser.ParsePower #2024

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Merged
slozier merged 1 commit into from
Mar 15, 2026
+20 −22
Merged

Fix Parser.ParsePower #2024

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42 changes: 20 additions & 22 deletions src/core/IronPython/Compiler/Parser.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -1980,13 +1980,9 @@ private Expression FinishUnaryNegate() {
return new UnaryExpression(PythonOperator.Negate, ParseFactor());
}

// power: ['await'] atom trailer* ['**' factor]
// power: atom_expr ['**' factor]
private Expression ParsePower() {
if (MaybeEat(TokenKind.KeywordAwait)) {
return ParseAwaitExpression();
}
Expression ret = ParseAtom();
ret = AddTrailers(ret);
Expression ret = ParseAtomExpr();
if (MaybeEat(TokenKind.Power)) {
var start = ret.StartIndex;
ret = new BinaryExpression(PythonOperator.Power, ret, ParseFactor());
Expand All @@ -1995,25 +1991,27 @@ private Expression ParsePower() {
return ret;
}

// await_expr: 'await' unary_expr (essentially power level)
private Expression ParseAwaitExpression() {
FunctionDefinition current = CurrentFunction;
if (current == null || !current.IsAsync) {
ReportSyntaxError("'await' outside async function");
// atom_expr: ['await'] atom trailer*
private Expression ParseAtomExpr() {
var isAsync = MaybeEat(TokenKind.KeywordAwait);
if (isAsync) {
FunctionDefinition current = CurrentFunction;
if (current is null || !current.IsAsync) {
ReportSyntaxError("'await' outside async function");
}
if (current is not null) {
current.IsGenerator = true;
current.GeneratorStop = GeneratorStop;
}
}

if (current != null) {
current.IsGenerator = true;
current.GeneratorStop = GeneratorStop;
Expression ret = ParseAtom();
ret = AddTrailers(ret);
if (isAsync) {
var start = ret.StartIndex;
ret = new AwaitExpression(ret);
ret.SetLoc(_globalParent, start, GetEnd());
}

var start = GetStart();

// Parse the awaitable expression at the unary level
Expression expr = ParsePower();

var ret = new AwaitExpression(expr);
ret.SetLoc(_globalParent, start, GetEnd());
return ret;
}

Expand Down