validator: make rules exported and allow custom set of rules for Validate (#320)

* validator: make rules exported and allow custom set of rules be passed to the Validate

* use format string as a first argument to Message()

---------

Co-authored-by: Kirill Grigorev <kirill.grigorev@omnevo.net>

Author: kgrigorev

validator/imported_test.go

@@ -11,10 +11,11 @@ import (
 	"testing"
 
 	"github.com/stretchr/testify/require"
+	"gopkg.in/yaml.v2"
+
 	"github.com/vektah/gqlparser/v2"
 	"github.com/vektah/gqlparser/v2/ast"
 	"github.com/vektah/gqlparser/v2/gqlerror"
-	"gopkg.in/yaml.v2"
 )
 
 type Spec struct {

validator/rules/fields_on_correct_type.go

@@ -1,4 +1,4 @@
-package validator
+package rules
 
 import (
 	"fmt"
@@ -11,8 +11,9 @@ import (
 	. "github.com/vektah/gqlparser/v2/validator"
 )
 
-func init() {
-	AddRule("FieldsOnCorrectType", func(observers *Events, addError AddErrFunc) {
+var FieldsOnCorrectTypeRule = Rule{
+	Name: "FieldsOnCorrectType",
+	RuleFunc: func(observers *Events, addError AddErrFunc) {
 		observers.OnField(func(walker *Walker, field *ast.Field) {
 			if field.ObjectDefinition == nil || field.Definition != nil {
 				return
@@ -27,14 +28,18 @@ func init() {
 			}
 
 			addError(
-				Message(message),
+				Message("%s", message),
 				At(field.Position),
 			)
 		})
-	})
+	},
+}
+
+func init() {
+	AddRule(FieldsOnCorrectTypeRule.Name, FieldsOnCorrectTypeRule.RuleFunc)
 }
 
-// Go through all of the implementations of type, as well as the interfaces
+// Go through all the implementations of type, as well as the interfaces
 // that they implement. If any of those types include the provided field,
 // suggest them, sorted by how often the type is referenced,  starting
 // with Interfaces.

validator/rules/fragments_on_composite_types.go

@@ -1,4 +1,4 @@
-package validator
+package rules
 
 import (
 	"fmt"
@@ -9,8 +9,9 @@ import (
 	. "github.com/vektah/gqlparser/v2/validator"
 )
 
-func init() {
-	AddRule("FragmentsOnCompositeTypes", func(observers *Events, addError AddErrFunc) {
+var FragmentsOnCompositeTypesRule = Rule{
+	Name: "FragmentsOnCompositeTypes",
+	RuleFunc: func(observers *Events, addError AddErrFunc) {
 		observers.OnInlineFragment(func(walker *Walker, inlineFragment *ast.InlineFragment) {
 			fragmentType := walker.Schema.Types[inlineFragment.TypeCondition]
 			if fragmentType == nil || fragmentType.IsCompositeType() {
@@ -20,7 +21,7 @@ func init() {
 			message := fmt.Sprintf(`Fragment cannot condition on non composite type "%s".`, inlineFragment.TypeCondition)
 
 			addError(
-				Message(message),
+				Message("%s", message),
 				At(inlineFragment.Position),
 			)
 		})
@@ -33,9 +34,13 @@ func init() {
 			message := fmt.Sprintf(`Fragment "%s" cannot condition on non composite type "%s".`, fragment.Name, fragment.TypeCondition)
 
 			addError(
-				Message(message),
+				Message("%s", message),
 				At(fragment.Position),
 			)
 		})
-	})
+	},
+}
+
+func init() {
+	AddRule(FragmentsOnCompositeTypesRule.Name, FragmentsOnCompositeTypesRule.RuleFunc)
 }

validator/rules/known_argument_names.go

@@ -1,4 +1,4 @@
-package validator
+package rules
 
 import (
 	"github.com/vektah/gqlparser/v2/ast"
@@ -7,8 +7,9 @@ import (
 	. "github.com/vektah/gqlparser/v2/validator"
 )
 
-func init() {
-	AddRule("KnownArgumentNames", func(observers *Events, addError AddErrFunc) {
+var KnownArgumentNamesRule = Rule{
+	Name: "KnownArgumentNames",
+	RuleFunc: func(observers *Events, addError AddErrFunc) {
 		// A GraphQL field is only valid if all supplied arguments are defined by that field.
 		observers.OnField(func(walker *Walker, field *ast.Field) {
 			if field.Definition == nil || field.ObjectDefinition == nil {
@@ -55,5 +56,9 @@ func init() {
 				)
 			}
 		})
-	})
+	},
+}
+
+func init() {
+	AddRule(KnownArgumentNamesRule.Name, KnownArgumentNamesRule.RuleFunc)
 }

validator/rules/known_directives.go

@@ -1,4 +1,4 @@
-package validator
+package rules
 
 import (
 	"github.com/vektah/gqlparser/v2/ast"
@@ -7,8 +7,9 @@ import (
 	. "github.com/vektah/gqlparser/v2/validator"
 )
 
-func init() {
-	AddRule("KnownDirectives", func(observers *Events, addError AddErrFunc) {
+var KnownDirectivesRule = Rule{
+	Name: "KnownDirectives",
+	RuleFunc: func(observers *Events, addError AddErrFunc) {
 		type mayNotBeUsedDirective struct {
 			Name   string
 			Line   int
@@ -45,5 +46,9 @@ func init() {
 				seen[tmp] = true
 			}
 		})
-	})
+	},
+}
+
+func init() {
+	AddRule(KnownDirectivesRule.Name, KnownDirectivesRule.RuleFunc)
 }

validator/rules/known_fragment_names.go

@@ -1,4 +1,4 @@
-package validator
+package rules
 
 import (
 	"github.com/vektah/gqlparser/v2/ast"
@@ -7,8 +7,9 @@ import (
 	. "github.com/vektah/gqlparser/v2/validator"
 )
 
-func init() {
-	AddRule("KnownFragmentNames", func(observers *Events, addError AddErrFunc) {
+var KnownFragmentNamesRule = Rule{
+	Name: "KnownFragmentNames",
+	RuleFunc: func(observers *Events, addError AddErrFunc) {
 		observers.OnFragmentSpread(func(walker *Walker, fragmentSpread *ast.FragmentSpread) {
 			if fragmentSpread.Definition == nil {
 				addError(
@@ -17,5 +18,9 @@ func init() {
 				)
 			}
 		})
-	})
+	},
+}
+
+func init() {
+	AddRule(KnownFragmentNamesRule.Name, KnownFragmentNamesRule.RuleFunc)
 }

validator/rules/known_root_type.go

@@ -1,4 +1,4 @@
-package validator
+package rules
 
 import (
 	"fmt"
@@ -9,8 +9,9 @@ import (
 	. "github.com/vektah/gqlparser/v2/validator"
 )
 
-func init() {
-	AddRule("KnownRootType", func(observers *Events, addError AddErrFunc) {
+var KnownRootTypeRule = Rule{
+	Name: "KnownRootType",
+	RuleFunc: func(observers *Events, addError AddErrFunc) {
 		// A query's root must be a valid type.  Surprisingly, this isn't
 		// checked anywhere else!
 		observers.OnOperation(func(walker *Walker, operation *ast.OperationDefinition) {
@@ -33,5 +34,9 @@ func init() {
 					At(operation.Position))
 			}
 		})
-	})
+	},
+}
+
+func init() {
+	AddRule(KnownRootTypeRule.Name, KnownRootTypeRule.RuleFunc)
 }

validator/rules/known_type_names.go

@@ -1,4 +1,4 @@
-package validator
+package rules
 
 import (
 	"github.com/vektah/gqlparser/v2/ast"
@@ -7,8 +7,9 @@ import (
 	. "github.com/vektah/gqlparser/v2/validator"
 )
 
-func init() {
-	AddRule("KnownTypeNames", func(observers *Events, addError AddErrFunc) {
+var KnownTypeNamesRule = Rule{
+	Name: "KnownTypeNames",
+	RuleFunc: func(observers *Events, addError AddErrFunc) {
 		observers.OnVariable(func(walker *Walker, variable *ast.VariableDefinition) {
 			typeName := variable.Type.Name()
 			typdef := walker.Schema.Types[typeName]
@@ -57,5 +58,9 @@ func init() {
 				At(fragment.Position),
 			)
 		})
-	})
+	},
+}
+
+func init() {
+	AddRule(KnownTypeNamesRule.Name, KnownTypeNamesRule.RuleFunc)
 }

validator/rules/lone_anonymous_operation.go

@@ -1,4 +1,4 @@
-package validator
+package rules
 
 import (
 	"github.com/vektah/gqlparser/v2/ast"
@@ -7,8 +7,9 @@ import (
 	. "github.com/vektah/gqlparser/v2/validator"
 )
 
-func init() {
-	AddRule("LoneAnonymousOperation", func(observers *Events, addError AddErrFunc) {
+var LoneAnonymousOperationRule = Rule{
+	Name: "LoneAnonymousOperation",
+	RuleFunc: func(observers *Events, addError AddErrFunc) {
 		observers.OnOperation(func(walker *Walker, operation *ast.OperationDefinition) {
 			if operation.Name == "" && len(walker.Document.Operations) > 1 {
 				addError(
@@ -17,5 +18,9 @@ func init() {
 				)
 			}
 		})
-	})
+	},
+}
+
+func init() {
+	AddRule(LoneAnonymousOperationRule.Name, LoneAnonymousOperationRule.RuleFunc)
 }

validator/rules/no_fragment_cycles.go

@@ -1,4 +1,4 @@
-package validator
+package rules
 
 import (
 	"fmt"
@@ -10,8 +10,9 @@ import (
 	. "github.com/vektah/gqlparser/v2/validator"
 )
 
-func init() {
-	AddRule("NoFragmentCycles", func(observers *Events, addError AddErrFunc) {
+var NoFragmentCyclesRule = Rule{
+	Name: "NoFragmentCycles",
+	RuleFunc: func(observers *Events, addError AddErrFunc) {
 		visitedFrags := make(map[string]bool)
 
 		observers.OnFragment(func(walker *Walker, fragment *ast.FragmentDefinition) {
@@ -67,7 +68,11 @@ func init() {
 
 			recursive(fragment)
 		})
-	})
+	},
+}
+
+func init() {
+	AddRule(NoFragmentCyclesRule.Name, NoFragmentCyclesRule.RuleFunc)
 }
 
 func getFragmentSpreads(node ast.SelectionSet) []*ast.FragmentSpread {