ast

type Parser interface {
	// Unmarshal parses policies representation to PDP's internal
	// representation and returns pointer to PolicyStorage with the policies.
	// It sets given tag to the policies. Policies with no tag can't be updated
	// incrementally.
	Unmarshal(in io.Reader, tag *uuid.UUID) (*pdp.PolicyStorage, error)

	// UnmarshalUpdate parses policies update representation to PDP's internal
	// representation. Requires attribute symbols table as attrs argument which maps
	// attribute name to its specification. Argument oldTag should match current
	// policies tag to make update applicable. Value of newTag is set to policies
	// when update is applied.
	UnmarshalUpdate(in io.Reader, s pdp.Symbols, oldTag, newTag uuid.UUID) (*pdp.PolicyUpdate, error)
}