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binding.go
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binding.go
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package gqlparser
import (
"errors"
"fmt"
)
var ErrBindValue = errors.New("no bind value")
type BindingResolver struct {
Indexed []any
Named map[string]any
}
func (r *BindingResolver) Resolve(value BindingVariable) (any, error) {
return value.resolveBy(r)
}
func (r *BindingResolver) getNamed(name string) (any, error) {
if r.Named == nil {
return nil, fmt.Errorf("%w: name=%s", ErrBindValue, name)
}
if v, ok := r.Named[name]; ok {
return v, nil
}
return nil, fmt.Errorf("%w: name=%s", ErrBindValue, name)
}
func (r *BindingResolver) getIndexed(index int64) (any, error) {
if r.Indexed == nil {
return nil, fmt.Errorf("%w: index=%d", ErrBindValue, index)
}
if index <= int64(len(r.Indexed)) {
return r.Indexed[index-1], nil
}
return nil, fmt.Errorf("%w: index=%d", ErrBindValue, index)
}
type BindingVariable interface {
resolveBy(resolver *BindingResolver) (any, error)
}
type NamedBinding struct {
Name string
}
func (b *NamedBinding) resolveBy(resolver *BindingResolver) (any, error) {
return resolver.getNamed(b.Name)
}
type IndexedBinding struct {
Index int64
}
func (b *IndexedBinding) resolveBy(resolver *BindingResolver) (any, error) {
return resolver.getIndexed(b.Index)
}