public override object VisitField(GraphQLParser.FieldContext context)
{
var field = new Field();
if (context.fieldName().alias() != null)
{
var aliasContext = context.fieldName().alias();
field.Alias = aliasContext.NAME(0).GetText();
field.Name = aliasContext.NAME(1).GetText();
}
else
{
field.Name = context.fieldName().NAME().GetText();
}
if (context.arguments() != null)
{
field.Arguments = Visit(context.arguments()) as Arguments;
}
if (context.directives() != null)
{
field.Directives = Visit(context.directives()) as Directives;
}
if (context.selectionSet() != null)
{
field.Selections = Visit(context.selectionSet()) as Selections;
}
return(field);
}
void CoerceDotNetValue(__Type fieldType, GraphQLParser.FieldContext field, Object value,
Context context = Context.Object)
{
try
{
if (value == null)
{
if (context == Context.List)
{
output.AddScalarValue(null);
}
else
{
output.AddScalarProperty(field.fieldName().GetText(), null);
}
}
else if (fieldType.dotNetType == value.GetType() || (fieldType.dotNetType.IsEnum && value is String))
{
if (context == Context.List)
{
output.AddScalarValue(value);
}
else
{
output.AddScalarProperty(field.fieldName().GetText(), value);
}
}
else
{
Error(
$"Error trying to coerce '{field.fieldName().GetText()}' of type '{value.GetType().Name}' to '{fieldType.kind}' with DotNetType: '{fieldType.dotNetType.Name}' ",
field);
}
}
catch (Exception e)
{
Error(
$"Error - '{e.Message}' trying to coerce '{field.fieldName().GetText()}' of type '{value.GetType().Name}' to '{fieldType.kind}' with DotNetType: '{fieldType.dotNetType.Name}' ",
field);
}
}
public Dictionary <string, Object> CoerceArgumentValues(__Type objectType, GraphQLParser.FieldContext field,
Dictionary <string, Object> variableValues)
{
if (field.arguments() == null)
{
return(emptyArgs);
}
var coercedValues = new Dictionary <string, Object>();
var argumentValues = field.arguments().argument();
var fieldName = field.fieldName().GetText();
var objectField = objectType.GetField((x) => x.name == fieldName);
if (objectField == null)
{
Error(
$"Could not find field with name - {fieldName} in objecttype with name: {objectType.name} and underlying type:{objectType.dotNetType.Name}",
field);
}
foreach (var argumentDefinition in objectField.args)
{
var argumentName = argumentDefinition.name;
var argumentType = argumentDefinition.type;
var defaultValue = argumentDefinition.defaultValue;
var value =
argumentValues.Where(x => x.NAME().GetText() == argumentName)
.Select(x => x.valueOrVariable())
.FirstOrDefault();
if (value?.variable() != null)
{
var variableName = value.variable().NAME().GetText();
Object variableValue = null;
if (variableValues.ContainsKey(variableName))
{
variableValue = variableValues[variableName];
}
if (variableValue != null)
{
coercedValues[argumentName] = variableValue;
}
else if (defaultValue != null)
{
coercedValues[argumentName] = defaultValue;
}
else if (argumentType.kind == __TypeKind.NON_NULL)
{
Error(
$"Required field '{argumentName}' refered by variable '{variableName}' is not present in document",
field);
}
else
{
continue;
}
}
else if (value?.value() == null)
{
if (defaultValue != null)
{
coercedValues[argumentName] = defaultValue;
}
else if (argumentType.kind == __TypeKind.NON_NULL)
{
Error($"Required field '{argumentName}' is not present in document", field);
}
else
{
continue;
}
}
else
{
coercedValues[argumentName] = CoerceDocumentValue(argumentType, argumentName, value.value());
}
}
return(coercedValues);
}
void CompleteValue(__Type fieldType, GraphQLParser.FieldContext field, List <GraphQLParser.FieldContext> fields,
Object result,
Dictionary <string, Object> variableValues, bool assertNotNull = false, Context context = Context.Object)
{
if (fieldType.kind == __TypeKind.NON_NULL)
{
var innerType = fieldType.ofType;
CompleteValue(innerType, field, fields, result, variableValues, true);
}
else if (result == null && assertNotNull)
{
Error($"Null or empty value was found on non null field", field);
}
else if (fieldType.kind == __TypeKind.LIST)
{
if (result != null && TypeCheck.IsEnumerableType(result.GetType()) == false)
{
Error($"Did not find list type for {field.fieldName().GetText()} - found {result.GetType().Name}",
field);
}
var innerType = fieldType.ofType;
output.PushArray(field.fieldName().GetText());
if (result != null)
{
foreach (var c in (IEnumerable)result)
{
if (field.fieldName().GetText() == "types" && IsSchemaQuery && c is __Type &&
((__Type)c).name.StartsWith("__"))
{
continue;
}
CompleteValue(innerType, field, fields, c, variableValues, false, Context.List);
}
}
output.Pop();
}
else if (fieldType.kind == __TypeKind.SCALAR || fieldType.kind == __TypeKind.ENUM)
{
CoerceDotNetValue(fieldType, field, result, context);
}
else if (fieldType.kind == __TypeKind.OBJECT || fieldType.kind == __TypeKind.UNION ||
fieldType.kind == __TypeKind.INTERFACE)
{
if (fieldType.kind == __TypeKind.OBJECT || fieldType.kind == __TypeKind.UNION)
{
var objectType = fieldType;
var subSelectionSet = MergeSelectionSets(fields);
if (context == Context.Object)
{
if (result == null)
{
output.AddScalarProperty(field.fieldName().GetText(), null);
}
else
{
output.PushObject(field.fieldName().GetText());
ExecuteSelectionSet(subSelectionSet, objectType, result, variableValues);
}
}
else if (context == Context.List)
{
if (result != null)
{
output.PushObject();
ExecuteSelectionSet(subSelectionSet, objectType, result, variableValues);
}
}
if (result != null)
{
output.Pop();
}
}
else
{
Error($"Interface and Union not yet supported", field);
}
}
else
{
Error($"Unexpected fieldType - {fieldType.kind}", field);
}
}