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Fix parser regressions of conditional expressions #75075

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merged 6 commits into from
Sep 24, 2024
Merged

Fix parser regressions of conditional expressions #75075

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222b836
Fix regression of parsing `with` expression in conditional expression
DoctorKrolic Sep 12, 2024
edb7723
Fix linq query parsing
DoctorKrolic Sep 12, 2024
4c36ed9
Merge branch 'dotnet:main' into with-parsing-regression
DoctorKrolic Sep 19, 2024
11ab036
More `await` tests
DoctorKrolic Sep 21, 2024
af05256
Add `global` test
DoctorKrolic Sep 21, 2024
af02bf2
Add `yield` tests
DoctorKrolic Sep 21, 2024
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17 changes: 12 additions & 5 deletions src/Compilers/CSharp/Portable/Parser/LanguageParser.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -7425,16 +7425,23 @@ bool canFollowNullableType()
// nullable-typed pattern
if (IsTrueIdentifier(this.CurrentToken))
{
// In a non-async method, `await` is a simple identifier. However, if we see `x ? await`
// 1. `async` can start a simple lambda in a conditional expression
// (e.g. `x is Y ? async a => ...`). The correct behavior is to treat `async` as a keyword
// 2. In a non-async method, `await` is a simple identifier. However, if we see `x ? await`
// it's almost certainly the start of an `await expression` in a conditional expression
// (e.g. `x is Y ? await ...`), not a nullable type pattern (since users would not use
// 'await' as the name of a variable). So just treat this as a conditional expression.
// Similarly, `async` can start a simple lambda in a conditional expression
// (e.g. `x is Y ? async a => ...`). The correct behavior is to treat `async` as a keyword
if (this.CurrentToken.ContextualKind is SyntaxKind.AsyncKeyword or SyntaxKind.AwaitKeyword)
// 3. `from` most likely starts a linq query: `x is Y ? from item in collection select item : ...`
if (this.CurrentToken.ContextualKind is SyntaxKind.AsyncKeyword or SyntaxKind.AwaitKeyword or SyntaxKind.FromKeyword)
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return false;

var nextToken = PeekToken(1);

// Cases like `x is Y ? someRecord with { } : ...`
if (nextToken.ContextualKind == SyntaxKind.WithKeyword)
return false;

var nextTokenKind = PeekToken(1).Kind;
var nextTokenKind = nextToken.Kind;

// These token either 100% end a pattern or start a new one:

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334 changes: 334 additions & 0 deletions src/Compilers/CSharp/Test/Syntax/Parsing/AwaitParsingTests.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -1339,6 +1339,340 @@ public void AwaitInConditionalExpressionAfterPattern4()
EOF();
}

[Fact, WorkItem("https://github.com/dotnet/roslyn/issues/72720")]
public void AwaitInConditionalExpressionAfterPattern5()
{
UsingDeclaration("""
void M()
{
var c = x is X ? await y : z;
}
""");

N(SyntaxKind.MethodDeclaration);
{
N(SyntaxKind.PredefinedType);
{
N(SyntaxKind.VoidKeyword);
}
N(SyntaxKind.IdentifierToken, "M");
N(SyntaxKind.ParameterList);
{
N(SyntaxKind.OpenParenToken);
N(SyntaxKind.CloseParenToken);
}
N(SyntaxKind.Block);
{
N(SyntaxKind.OpenBraceToken);
N(SyntaxKind.LocalDeclarationStatement);
{
N(SyntaxKind.VariableDeclaration);
{
N(SyntaxKind.IdentifierName);
{
N(SyntaxKind.IdentifierToken, "var");
}
N(SyntaxKind.VariableDeclarator);
{
N(SyntaxKind.IdentifierToken, "c");
N(SyntaxKind.EqualsValueClause);
{
N(SyntaxKind.EqualsToken);
N(SyntaxKind.ConditionalExpression);
{
N(SyntaxKind.IsExpression);
{
N(SyntaxKind.IdentifierName);
{
N(SyntaxKind.IdentifierToken, "x");
}
N(SyntaxKind.IsKeyword);
N(SyntaxKind.IdentifierName);
{
N(SyntaxKind.IdentifierToken, "X");
}
}
N(SyntaxKind.QuestionToken);
N(SyntaxKind.AwaitExpression);
{
N(SyntaxKind.AwaitKeyword);
N(SyntaxKind.IdentifierName);
{
N(SyntaxKind.IdentifierToken, "y");
}
}
N(SyntaxKind.ColonToken);
N(SyntaxKind.IdentifierName);
{
N(SyntaxKind.IdentifierToken, "z");
}
}
}
}
}
N(SyntaxKind.SemicolonToken);
}
N(SyntaxKind.CloseBraceToken);
}
}
EOF();
}

[Fact, WorkItem("https://github.com/dotnet/roslyn/issues/72720")]
public void AwaitInConditionalExpressionAfterPattern6()
{
UsingDeclaration("""
async void M()
{
var c = x is X ? await y : z;
}
""");

N(SyntaxKind.MethodDeclaration);
{
N(SyntaxKind.AsyncKeyword);
N(SyntaxKind.PredefinedType);
{
N(SyntaxKind.VoidKeyword);
}
N(SyntaxKind.IdentifierToken, "M");
N(SyntaxKind.ParameterList);
{
N(SyntaxKind.OpenParenToken);
N(SyntaxKind.CloseParenToken);
}
N(SyntaxKind.Block);
{
N(SyntaxKind.OpenBraceToken);
N(SyntaxKind.LocalDeclarationStatement);
{
N(SyntaxKind.VariableDeclaration);
{
N(SyntaxKind.IdentifierName);
{
N(SyntaxKind.IdentifierToken, "var");
}
N(SyntaxKind.VariableDeclarator);
{
N(SyntaxKind.IdentifierToken, "c");
N(SyntaxKind.EqualsValueClause);
{
N(SyntaxKind.EqualsToken);
N(SyntaxKind.ConditionalExpression);
{
N(SyntaxKind.IsExpression);
{
N(SyntaxKind.IdentifierName);
{
N(SyntaxKind.IdentifierToken, "x");
}
N(SyntaxKind.IsKeyword);
N(SyntaxKind.IdentifierName);
{
N(SyntaxKind.IdentifierToken, "X");
}
}
N(SyntaxKind.QuestionToken);
N(SyntaxKind.AwaitExpression);
{
N(SyntaxKind.AwaitKeyword);
N(SyntaxKind.IdentifierName);
{
N(SyntaxKind.IdentifierToken, "y");
}
}
N(SyntaxKind.ColonToken);
N(SyntaxKind.IdentifierName);
{
N(SyntaxKind.IdentifierToken, "z");
}
}
}
}
}
N(SyntaxKind.SemicolonToken);
}
N(SyntaxKind.CloseBraceToken);
}
}
EOF();
}

[Fact, WorkItem("https://github.com/dotnet/roslyn/issues/72720")]
public void AwaitInConditionalExpressionAfterPattern7()
{
UsingDeclaration("""
void M()
{
var c = x is X ? await(y) : z;
}
""");

N(SyntaxKind.MethodDeclaration);
{
N(SyntaxKind.PredefinedType);
{
N(SyntaxKind.VoidKeyword);
}
N(SyntaxKind.IdentifierToken, "M");
N(SyntaxKind.ParameterList);
{
N(SyntaxKind.OpenParenToken);
N(SyntaxKind.CloseParenToken);
}
N(SyntaxKind.Block);
{
N(SyntaxKind.OpenBraceToken);
N(SyntaxKind.LocalDeclarationStatement);
{
N(SyntaxKind.VariableDeclaration);
{
N(SyntaxKind.IdentifierName);
{
N(SyntaxKind.IdentifierToken, "var");
}
N(SyntaxKind.VariableDeclarator);
{
N(SyntaxKind.IdentifierToken, "c");
N(SyntaxKind.EqualsValueClause);
{
N(SyntaxKind.EqualsToken);
N(SyntaxKind.ConditionalExpression);
{
N(SyntaxKind.IsExpression);
{
N(SyntaxKind.IdentifierName);
{
N(SyntaxKind.IdentifierToken, "x");
}
N(SyntaxKind.IsKeyword);
N(SyntaxKind.IdentifierName);
{
N(SyntaxKind.IdentifierToken, "X");
}
}
N(SyntaxKind.QuestionToken);
N(SyntaxKind.InvocationExpression);
{
N(SyntaxKind.IdentifierName);
{
N(SyntaxKind.IdentifierToken, "await");
}
N(SyntaxKind.ArgumentList);
{
N(SyntaxKind.OpenParenToken);
N(SyntaxKind.Argument);
{
N(SyntaxKind.IdentifierName);
{
N(SyntaxKind.IdentifierToken, "y");
}
}
N(SyntaxKind.CloseParenToken);
}
}
N(SyntaxKind.ColonToken);
N(SyntaxKind.IdentifierName);
{
N(SyntaxKind.IdentifierToken, "z");
}
}
}
}
}
N(SyntaxKind.SemicolonToken);
}
N(SyntaxKind.CloseBraceToken);
}
}
EOF();
}

[Fact, WorkItem("https://github.com/dotnet/roslyn/issues/72720")]
public void AwaitInConditionalExpressionAfterPattern8()
{
UsingDeclaration("""
async void M()
{
var c = x is X ? await (y) : z;
}
""");

N(SyntaxKind.MethodDeclaration);
{
N(SyntaxKind.AsyncKeyword);
N(SyntaxKind.PredefinedType);
{
N(SyntaxKind.VoidKeyword);
}
N(SyntaxKind.IdentifierToken, "M");
N(SyntaxKind.ParameterList);
{
N(SyntaxKind.OpenParenToken);
N(SyntaxKind.CloseParenToken);
}
N(SyntaxKind.Block);
{
N(SyntaxKind.OpenBraceToken);
N(SyntaxKind.LocalDeclarationStatement);
{
N(SyntaxKind.VariableDeclaration);
{
N(SyntaxKind.IdentifierName);
{
N(SyntaxKind.IdentifierToken, "var");
}
N(SyntaxKind.VariableDeclarator);
{
N(SyntaxKind.IdentifierToken, "c");
N(SyntaxKind.EqualsValueClause);
{
N(SyntaxKind.EqualsToken);
N(SyntaxKind.ConditionalExpression);
{
N(SyntaxKind.IsExpression);
{
N(SyntaxKind.IdentifierName);
{
N(SyntaxKind.IdentifierToken, "x");
}
N(SyntaxKind.IsKeyword);
N(SyntaxKind.IdentifierName);
{
N(SyntaxKind.IdentifierToken, "X");
}
}
N(SyntaxKind.QuestionToken);
N(SyntaxKind.AwaitExpression);
{
N(SyntaxKind.AwaitKeyword);
N(SyntaxKind.ParenthesizedExpression);
{
N(SyntaxKind.OpenParenToken);
N(SyntaxKind.IdentifierName);
{
N(SyntaxKind.IdentifierToken, "y");
}
N(SyntaxKind.CloseParenToken);
}
}
N(SyntaxKind.ColonToken);
N(SyntaxKind.IdentifierName);
{
N(SyntaxKind.IdentifierToken, "z");
}
}
}
}
}
N(SyntaxKind.SemicolonToken);
}
N(SyntaxKind.CloseBraceToken);
}
}
EOF();
}

[Fact, WorkItem("https://github.com/dotnet/roslyn/issues/72720")]
public void AwaitAsStartOfExpressionInConditional1()
{
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