Interface AttributeFactory

interpreter/attributes.go:28–63

AttributeFactory provides methods creating Attribute and Qualifier values.

// AttributeFactory provides methods creating Attribute and Qualifier values.
type AttributeFactory interface {
	// AbsoluteAttribute creates an attribute that refers to a top-level variable name.
	//
	// Checked expressions generate absolute attribute with a single name.
	// Parse-only expressions may have more than one possible absolute identifier when the
	// expression is created within a container, e.g. package or namespace.
	//
	// When there is more than one name supplied to the AbsoluteAttribute call, the names
	// must be in CEL's namespace resolution order. The name arguments provided here are
	// returned in the same order as they were provided by the NamespacedAttribute
	// CandidateVariableNames method.
	AbsoluteAttribute(id int64, names ...string) NamespacedAttribute

	// ConditionalAttribute creates an attribute with two Attribute branches, where the Attribute
	// that is resolved depends on the boolean evaluation of the input 'expr'.
	ConditionalAttribute(id int64, expr Interpretable, t, f Attribute) Attribute

	// MaybeAttribute creates an attribute that refers to either a field selection or a namespaced
	// variable name.
	//
	// Only expressions which have not been type-checked may generate oneof attributes.
	MaybeAttribute(id int64, name string) Attribute

	// RelativeAttribute creates an attribute whose value is a qualification of a dynamic
	// computation rather than a static variable reference.
	RelativeAttribute(id int64, operand Interpretable) Attribute

	// NewQualifier creates a qualifier on the target object with a given value.
	//
	// The 'val' may be an Attribute or any proto-supported map key type: bool, int, string, uint.
	//
	// The qualifier may consider the object type being qualified, if present. If absent, the
	// qualification should be considered dynamic and the qualification should still work, though
	// it may be sub-optimal.
	NewQualifier(objType *types.Type, qualID int64, val any, opt bool) (Qualifier, error)
}

// Qualifier marker interface for designating different qualifier values and where they appear
// within field selections and index call expressions (`_[_]`).