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package graphql
import (
"context"
"fmt"
"github.com/vektah/gqlgen/neelance/common"
"github.com/vektah/gqlgen/neelance/query"
"github.com/vektah/gqlgen/neelance/schema"
)
type ExecutableSchema interface {
Schema() *schema.Schema
Query(ctx context.Context, op *query.Operation) *Response
Mutation(ctx context.Context, op *query.Operation) *Response
Subscription(ctx context.Context, op *query.Operation) func() *Response
}
func CollectFields(doc *query.Document, selSet []query.Selection, satisfies []string, variables map[string]interface{}) []CollectedField {
return collectFields(doc, selSet, satisfies, variables, map[string]bool{})
}
func collectFields(doc *query.Document, selSet []query.Selection, satisfies []string, variables map[string]interface{}, visited map[string]bool) []CollectedField {
var groupedFields []CollectedField
for _, sel := range selSet {
switch sel := sel.(type) {
case *query.Field:
f := getOrCreateField(&groupedFields, sel.Alias.Name, func() CollectedField {
f := CollectedField{
Alias: sel.Alias.Name,
Name: sel.Name.Name,
}
if len(sel.Arguments) > 0 {
f.Args = map[string]interface{}{}
for _, arg := range sel.Arguments {
if variable, ok := arg.Value.(*common.Variable); ok {
if val, ok := variables[variable.Name]; ok {
f.Args[arg.Name.Name] = val
}
} else {
f.Args[arg.Name.Name] = arg.Value.Value(variables)
}
}
}
return f
})
f.Selections = append(f.Selections, sel.Selections...)
case *query.InlineFragment:
if !instanceOf(sel.On.Ident.Name, satisfies) {
continue
}
for _, childField := range collectFields(doc, sel.Selections, satisfies, variables, visited) {
f := getOrCreateField(&groupedFields, childField.Name, func() CollectedField { return childField })
f.Selections = append(f.Selections, childField.Selections...)
}
case *query.FragmentSpread:
fragmentName := sel.Name.Name
if _, seen := visited[fragmentName]; seen {
continue
}
visited[fragmentName] = true
fragment := doc.Fragments.Get(fragmentName)
if fragment == nil {
// should never happen, validator has already run
panic(fmt.Errorf("missing fragment %s", fragmentName))
}
if !instanceOf(fragment.On.Ident.Name, satisfies) {
continue
}
for _, childField := range collectFields(doc, fragment.Selections, satisfies, variables, 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 {
Alias string
Name string
Args map[string]interface{}
Selections []query.Selection
}
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]
}
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