forked from 99designs/gqlgen
/
context_path.go
77 lines (62 loc) · 1.65 KB
/
context_path.go
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package graphql
import (
"context"
"github.com/vektah/gqlparser/v2/ast"
)
const fieldInputCtx key = "path_context"
type PathContext struct {
ParentField *FieldContext
Parent *PathContext
Field *string
Index *int
}
func (fic *PathContext) Path() ast.Path {
var path ast.Path
for it := fic; it != nil; it = it.Parent {
if it.Index != nil {
path = append(path, ast.PathIndex(*it.Index))
} else if it.Field != nil {
path = append(path, ast.PathName(*it.Field))
}
}
// because we are walking up the chain, all the elements are backwards, do an inplace flip.
for i := len(path)/2 - 1; i >= 0; i-- {
opp := len(path) - 1 - i
path[i], path[opp] = path[opp], path[i]
}
if fic.ParentField != nil {
fieldPath := fic.ParentField.Path()
return append(fieldPath, path...)
}
return path
}
func NewPathWithField(field string) *PathContext {
return &PathContext{Field: &field}
}
func NewPathWithIndex(index int) *PathContext {
return &PathContext{Index: &index}
}
func WithPathContext(ctx context.Context, fic *PathContext) context.Context {
if fieldContext := GetFieldContext(ctx); fieldContext != nil {
fic.ParentField = fieldContext
}
if fieldInputContext := GetPathContext(ctx); fieldInputContext != nil {
fic.Parent = fieldInputContext
}
return context.WithValue(ctx, fieldInputCtx, fic)
}
func GetPathContext(ctx context.Context) *PathContext {
if val, ok := ctx.Value(fieldInputCtx).(*PathContext); ok {
return val
}
return nil
}
func GetPath(ctx context.Context) ast.Path {
if pc := GetPathContext(ctx); pc != nil {
return pc.Path()
}
if fc := GetFieldContext(ctx); fc != nil {
return fc.Path()
}
return nil
}