ccb8072759
- use GitHub Actions instead of TravisCI - updates golangci-lint to v1.36.0 and applies my rules
69 lines
1.6 KiB
Go
69 lines
1.6 KiB
Go
package interp_test
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import (
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"reflect"
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"testing"
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"github.com/traefik/yaegi/interp"
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)
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type Helloer interface {
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Hello()
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}
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func Hi(h Helloer) {
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println("In Hi:")
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h.Hello()
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}
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// A Wrap represents the wrapper which allows to use objects created by
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// the interpreter as Go interfaces (despite limitations in reflect which
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// forbid dynamic method creation).
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//
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// All the struct fields are functions, where the fied name corresponds to
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// the method name prefixed by "Do". The function signature must be the
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// same as the interface one.
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//
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// A corresponding Wrap method Xyz which satisfies the interface must exist and
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// must invoke the DoXyz function.
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//
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// To be usable, the interpreter should return a Wrap instance with the relevant
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// function fields filled. The application can then invoke methods on it.
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// The method calls will be forwarded to the interpreter.
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//
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// Only the Wrap type definition needs to be exported to the interpreter (not
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// the interfaces and methods definitions).
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//
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type Wrap struct {
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DoHello func() // related to the Hello() method.
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// Other interface method wrappers...
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}
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func (w Wrap) Hello() { w.DoHello() }
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func TestInterface(t *testing.T) {
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i := interp.New(interp.Options{})
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// export the Wrap type to the interpreter under virtual "wrap" package
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i.Use(interp.Exports{
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"wrap": {
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"Wrap": reflect.ValueOf((*Wrap)(nil)),
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},
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})
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eval(t, i, `
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import "wrap"
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type MyInt int
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func (m MyInt) Hello() { println("hello from Myint", m) }
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func NewMyInt(i int) wrap.Wrap {
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m := MyInt(i)
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return wrap.Wrap{DoHello: m.Hello}
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}
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`)
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NewMyInt := eval(t, i, "NewMyInt").Interface().(func(int) Wrap)
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w := NewMyInt(4)
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Hi(w)
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}
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