/**
* Produces a Go value given a GraphQL Value AST.
*
* A GraphQL type must be provided, which will be used to interpret different
* GraphQL Value literals.
*
* | GraphQL Value | JSON Value |
* | -------------------- | ------------- |
* | Input Object | Object |
* | List | Array |
* | Boolean | Boolean |
* | String / Enum Value | String |
* | Int / Float | Number |
*
*/
func ValueFromAST(
valueAST lang.IValue,
typ typs.QLInputType,
variables map[string]interface{},
) interface{} {
if typ, ok := typ.(*typs.QLNonNull); ok {
nullableType := typ.OfType.(typs.QLInputType)
return ValueFromAST(valueAST, nullableType, variables)
}
if IsNil(valueAST) {
return nil
}
if valueAST, ok := valueAST.(*lang.Variable); ok {
variableName := valueAST.Name.Value
return variables[variableName]
}
switch typ := typ.(type) {
case *typs.QLList:
if valueAST, ok := valueAST.(*lang.ListValue); ok {
itemType := typ.OfType.(typs.QLInputType)
result := make([]interface{}, len(valueAST.Values))[:0]
for _, itemAST := range valueAST.Values {
result = append(result, ValueFromAST(itemAST, itemType, variables))
}
return result
}
return []interface{}{ValueFromAST(valueAST, typ, variables)}
case *typs.QLInputObject:
valueAST, ok := valueAST.(*lang.ObjectValue)
if !ok {
return nil
}
fieldASTMap := make(map[string]*lang.ObjectField)
for _, fieldAST := range valueAST.Fields {
fieldASTMap[fieldAST.Name.Value] = fieldAST
}
result := make(map[string]interface{})
fields := typ.GetFields()
for fieldName, field := range fields {
fieldAST := fieldASTMap[fieldName]
var fieldValue interface{}
if fieldAST != nil {
fieldValue = ValueFromAST(fieldAST.Value, field.Type, variables)
}
if IsNil(fieldValue) {
fieldValue = field.DefaultValue
}
if !IsNil(fieldValue) {
result[fieldName] = fieldValue
}
}
return result
case *typs.QLScalar:
parsed := typ.ParseLiteral(valueAST)
if IsNil(parsed) {
return nil
}
return parsed
default:
throw("Must be input type")
return nil
}
}
func IsValidLiteralValue(typ typs.QLInputType, valueAST lang.IValue) bool {
if typ, ok := typ.(*typs.QLNonNull); ok {
if IsNil(valueAST) {
return false
}
ofType := typ.OfType.(typs.QLInputType)
return IsValidLiteralValue(ofType, valueAST)
}
if IsNil(valueAST) {
return false
}
if _, ok := valueAST.(*lang.Variable); ok {
return true
}
if typ, ok := typ.(*typs.QLList); ok {
itemType := typ.OfType.(typs.QLInputType)
if valueAST, ok := valueAST.(*lang.ListValue); ok {
for i := range valueAST.Values {
return IsValidLiteralValue(itemType, valueAST.Values[i])
}
}
}
if typ, ok := typ.(*typs.QLInputObject); ok {
if _, ok := valueAST.(*lang.ObjectValue); !ok {
return false
}
fields := typ.GetFields()
fieldASTs := valueAST.(*lang.ObjectValue).Fields
refinedFieldASTs := []interface{}{}
for i := range fieldASTs {
if fields[fieldASTs[i].Name.Value] == nil {
return false
}
refinedFieldASTs = append(refinedFieldASTs, fieldASTs[i])
}
fieldASTMap := make(map[string]interface{})
for _, fieldAST := range refinedFieldASTs {
fieldASTMap[fieldAST.(lang.ObjectField).Name.Value] = fieldAST
}
for k, v := range fields {
return IsValidLiteralValue(v.Type, fieldASTMap[k].(*lang.ObjectField).Value)
}
}
if typ, ok := typ.(*typs.QLScalar); ok {
return !IsNil(typ.ParseLiteral(valueAST))
}
if typ, ok := typ.(*typs.QLEnum); ok {
return !IsNil(typ.ParseLiteral(valueAST))
}
return false
}
