fix a deadloop when parsing variable like a.b.c

go.mod

@@ -2,6 +2,4 @@ module github.com/huandu/go-assert
 
 go 1.13
 
-require (
- github.com/davecgh/go-spew v1.1.1
-)
+require github.com/davecgh/go-spew v1.1.1

go.sum

@@ -1,11 +1,2 @@
-github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
-github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJyk=
-github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
-gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
-gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

internal/assertion/assertion.go

@@ -510,7 +510,11 @@ func getValueInterface(v reflect.Value) interface{} {
  num := v.NumField()
 
  for i := 0; i < num; i++ {
- st.Field(i).Set(reflect.ValueOf(getValueInterface(v.Field(i))))
+ field := st.Field(i)
+
+ if field.CanSet() {
+ field.Set(reflect.ValueOf(getValueInterface(v.Field(i))))
+ }
  }
 
  return st.Interface()

internal/assertion/parser.go

@@ -522,7 +522,7 @@ func IsVar(expr ast.Expr) bool {
 
  for {
  if sel, ok := x.(*ast.SelectorExpr); ok {
- x = sel
+ x = sel.X
  } else {
  break
  }