1package validator
 2
 3import (
 4	"github.com/vektah/gqlparser/ast"
 5	. "github.com/vektah/gqlparser/validator"
 6)
 7
 8func init() {
 9	AddRule("UniqueFragmentNames", func(observers *Events, addError AddErrFunc) {
10		seenFragments := map[string]bool{}
11
12		observers.OnFragment(func(walker *Walker, fragment *ast.FragmentDefinition) {
13			if seenFragments[fragment.Name] {
14				addError(
15					Message(`There can be only one fragment named "%s".`, fragment.Name),
16					At(fragment.Position),
17				)
18			}
19			seenFragments[fragment.Name] = true
20		})
21	})
22}