Source file src/github.com/vektah/gqlparser/validator/rules/known_directives.go

Documentation: github.com/vektah/gqlparser/validator/rules

     1  package validator
     2  
     3  import (
     4  	"github.com/vektah/gqlparser/ast"
     5  	. "github.com/vektah/gqlparser/validator"
     6  )
     7  
     8  func 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  }
    32  

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