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codeql/csharp/ql/test/library-tests/csharp7/IsPatterns.ql
Tom Hvitved a1e58cedac C#: Refactor recursive patterns implementation
- Extract names of properties in a propery match, using the `exprorstmt_name` relation.
- Simplify extraction of properties by not distinguishing between top-level patterns
  and nested patterns.
- Introduce `PatternExpr` to capture patterns in `is` expressions, `case` statements,
  and `switch` expression arms.
- Generalize `IsTypeExpr`, `IsPatternExpr`, `IsRecursivePatternExpr`, and `IsConstantExpr`
  to just `IsExpr` with a member predicate `PatternExpr getPattern()`.
- Generalize `TypeCase`, `RecursivePatternCase`, and `ConstCase` to just `CaseStmt` with
  a member predicate `PatternExpr getPattern()`.
- Introduce classes `Switch` and `Case` as base classes of switch statements/expressions
  and case statements/switch expression arms, respectively.
- Simplify CFG logic using the generalized classes.
- Generalize guards library to cover `switch` expressions tests.
- Generalize data flow library to cover `switch` expression assignments.
2019-05-24 13:49:05 +01:00

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import csharp
from IsExpr e, boolean isVar, VariablePatternExpr vpe
where
vpe = e.getPattern() and
if vpe.isImplicitlyTyped() then isVar = true else isVar = false
select e, vpe.getType().toString(), vpe, isVar