1 files changed, 135 insertions, 0 deletions
diff --git a/vendor/github.com/99designs/gqlgen/graphql/exec.go b/vendor/github.com/99designs/gqlgen/graphql/exec.go
new file mode 100644
index 00000000..9beb3149
--- /dev/null
+++ b/vendor/github.com/99designs/gqlgen/graphql/exec.go
@@ -0,0 +1,135 @@
+package graphql
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/vektah/gqlparser/ast"
+)
+
+type ExecutableSchema interface {
+	Schema() *ast.Schema
+
+	Complexity(typeName, fieldName string, childComplexity int, args map[string]interface{}) (int, bool)
+	Query(ctx context.Context, op *ast.OperationDefinition) *Response
+	Mutation(ctx context.Context, op *ast.OperationDefinition) *Response
+	Subscription(ctx context.Context, op *ast.OperationDefinition) func() *Response
+}
+
+func CollectFields(ctx context.Context, selSet ast.SelectionSet, satisfies []string) []CollectedField {
+	return collectFields(GetRequestContext(ctx), selSet, satisfies, map[string]bool{})
+}
+
+func collectFields(reqCtx *RequestContext, selSet ast.SelectionSet, satisfies []string, visited map[string]bool) []CollectedField {
+	var groupedFields []CollectedField
+
+	for _, sel := range selSet {
+		switch sel := sel.(type) {
+		case *ast.Field:
+			if !shouldIncludeNode(sel.Directives, reqCtx.Variables) {
+				continue
+			}
+			f := getOrCreateField(&groupedFields, sel.Alias, func() CollectedField {
+				return CollectedField{Field: sel}
+			})
+
+			f.Selections = append(f.Selections, sel.SelectionSet...)
+		case *ast.InlineFragment:
+			if !shouldIncludeNode(sel.Directives, reqCtx.Variables) || !instanceOf(sel.TypeCondition, satisfies) {
+				continue
+			}
+			for _, childField := range collectFields(reqCtx, sel.SelectionSet, satisfies, visited) {
+				f := getOrCreateField(&groupedFields, childField.Name, func() CollectedField { return childField })
+				f.Selections = append(f.Selections, childField.Selections...)
+			}
+
+		case *ast.FragmentSpread:
+			if !shouldIncludeNode(sel.Directives, reqCtx.Variables) {
+				continue
+			}
+			fragmentName := sel.Name
+			if _, seen := visited[fragmentName]; seen {
+				continue
+			}
+			visited[fragmentName] = true
+
+			fragment := reqCtx.Doc.Fragments.ForName(fragmentName)
+			if fragment == nil {
+				// should never happen, validator has already run
+				panic(fmt.Errorf("missing fragment %s", fragmentName))
+			}
+
+			if !instanceOf(fragment.TypeCondition, satisfies) {
+				continue
+			}
+
+			for _, childField := range collectFields(reqCtx, fragment.SelectionSet, satisfies, visited) {
+				f := getOrCreateField(&groupedFields, childField.Name, func() CollectedField { return childField })
+				f.Selections = append(f.Selections, childField.Selections...)
+			}
+
+		default:
+			panic(fmt.Errorf("unsupported %T", sel))
+		}
+	}
+
+	return groupedFields
+}
+
+type CollectedField struct {
+	*ast.Field
+
+	Selections ast.SelectionSet
+}
+
+func instanceOf(val string, satisfies []string) bool {
+	for _, s := range satisfies {
+		if val == s {
+			return true
+		}
+	}
+	return false
+}
+
+func getOrCreateField(c *[]CollectedField, name string, creator func() CollectedField) *CollectedField {
+	for i, cf := range *c {
+		if cf.Alias == name {
+			return &(*c)[i]
+		}
+	}
+
+	f := creator()
+
+	*c = append(*c, f)
+	return &(*c)[len(*c)-1]
+}
+
+func shouldIncludeNode(directives ast.DirectiveList, variables map[string]interface{}) bool {
+	skip, include := false, true
+
+	if d := directives.ForName("skip"); d != nil {
+		skip = resolveIfArgument(d, variables)
+	}
+
+	if d := directives.ForName("include"); d != nil {
+		include = resolveIfArgument(d, variables)
+	}
+
+	return !skip && include
+}
+
+func resolveIfArgument(d *ast.Directive, variables map[string]interface{}) bool {
+	arg := d.Arguments.ForName("if")
+	if arg == nil {
+		panic(fmt.Sprintf("%s: argument 'if' not defined", d.Name))
+	}
+	value, err := arg.Value.Value(variables)
+	if err != nil {
+		panic(err)
+	}
+	ret, ok := value.(bool)
+	if !ok {
+		panic(fmt.Sprintf("%s: argument 'if' is not a boolean", d.Name))
+	}
+	return ret
+}