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dsl: add ExprType.HasMethod() #349

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Jan 6, 2022
Merged

dsl: add ExprType.HasMethod() #349

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12 changes: 12 additions & 0 deletions dsl/dsl.go
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Original file line number Diff line number Diff line change
Expand Up @@ -213,6 +213,18 @@ func (ExprType) ConvertibleTo(typ string) bool { return boolResult }
// See https://golang.org/pkg/go/types/#Implements.
func (ExprType) Implements(typ typeName) bool { return boolResult }

// HasMethod reports whether a type has a given method.
// Unlike Implements(), it will work for both value and pointer types.
//
// fn argument is a function signature, like `WriteString(string) (int, error)`.
// It can also be in form of a method reference for importable types: `io.StringWriter.WriteString`.
//
// To avoid confusion with Implements() method, here is a hint when to use which:
//
// - If you want to check if it's possible to call F on x, use HasMethod().
// - If you want to know if you can pass x as I interface, use Implements().
func (ExprType) HasMethod(fn string) bool { return boolResult }

// Is reports whether a type is identical to a given type.
func (ExprType) Is(typ string) bool { return boolResult }

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