1package validator
 2
 3import (
 4	"github.com/vektah/gqlparser/ast"
 5	. "github.com/vektah/gqlparser/validator"
 6)
 7
 8func init() {
 9	AddRule("KnownDirectives", func(observers *Events, addError AddErrFunc) {
10		observers.OnDirective(func(walker *Walker, directive *ast.Directive) {
11			if directive.Definition == nil {
12				addError(
13					Message(`Unknown directive "%s".`, directive.Name),
14					At(directive.Position),
15				)
16				return
17			}
18
19			for _, loc := range directive.Definition.Locations {
20				if loc == directive.Location {
21					return
22				}
23			}
24
25			addError(
26				Message(`Directive "%s" may not be used on %s.`, directive.Name, directive.Location),
27				At(directive.Position),
28			)
29		})
30	})
31}