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enum.go
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enum.go
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package schema
import "fmt"
// EnumDefinition represents the definition of an enum type.
type EnumDefinition struct {
// Name is the name of the enum type. It must conform to the NameFormat regular expression.
// Its name must be unique between all enum types and object types in the module.
// The same enum, however, can be used in multiple object types and fields as long as the
// definition is identical each time
Name string
// Values is a list of distinct, non-empty values that are part of the enum type.
// Each value must conform to the NameFormat regular expression.
Values []string
}
// Validate validates the enum definition.
func (e EnumDefinition) Validate() error {
if !ValidateName(e.Name) {
return fmt.Errorf("invalid enum definition name %q", e.Name)
}
if len(e.Values) == 0 {
return fmt.Errorf("enum definition values cannot be empty")
}
seen := make(map[string]bool, len(e.Values))
for i, v := range e.Values {
if !ValidateName(v) {
return fmt.Errorf("invalid enum definition value %q at index %d for enum %s", v, i, e.Name)
}
if seen[v] {
return fmt.Errorf("duplicate enum definition value %q for enum %s", v, e.Name)
}
seen[v] = true
}
return nil
}
// ValidateValue validates that the value is a valid enum value.
func (e EnumDefinition) ValidateValue(value string) error {
for _, v := range e.Values {
if v == value {
return nil
}
}
return fmt.Errorf("value %q is not a valid enum value for %s", value, e.Name)
}
// checkEnumCompatibility checks that the enum values are consistent across object types and fields.
func checkEnumCompatibility(enumValueMap map[string]map[string]bool, field Field) error {
if field.Kind != EnumKind {
return nil
}
enum := field.EnumDefinition
if existing, ok := enumValueMap[enum.Name]; ok {
if len(existing) != len(enum.Values) {
return fmt.Errorf("enum %q has different number of values in different object types", enum.Name)
}
for _, value := range enum.Values {
if !existing[value] {
return fmt.Errorf("enum %q has different values in different object types", enum.Name)
}
}
} else {
valueMap := map[string]bool{}
for _, value := range enum.Values {
valueMap[value] = true
}
enumValueMap[enum.Name] = valueMap
}
return nil
}