cel

type CompilationResult struct {
	Program            cel.Program
	Error              *apiservercel.Error
	ExpressionAccessor ExpressionAccessor
	OutputType         *cel.Type
}

type Compiler interface {
	CompileCELExpression(expressionAccessor ExpressionAccessor, options OptionalVariableDeclarations, mode environment.Type) CompilationResult
}

type CompositedCompiler struct {
	Compiler
	FilterCompiler

	CompositionEnv *CompositionEnv
}

type CompositedFilter struct {
	Filter
	// contains filtered or unexported fields
}

type CompositionContext interface {
	context.Context
	Variables(activation any) ref.Val
	GetAndResetCost() int64
}

type CompositionEnv struct {
	*environment.EnvSet

	MapType           *apiservercel.DeclType
	CompiledVariables map[string]CompilationResult
}

type EvaluationResult struct {
	EvalResult         ref.Val
	ExpressionAccessor ExpressionAccessor
	Elapsed            time.Duration
	Error              error
}

type ExpressionAccessor interface {
	GetExpression() string
	ReturnTypes() []*cel.Type
}

type Filter interface {
	// ForInput converts compiled CEL-typed values into evaluated CEL-typed value.
	// runtimeCELCostBudget was added for testing purpose only. Callers should always use const RuntimeCELCostBudget from k8s.io/apiserver/pkg/apis/cel/config.go as input.
	// If cost budget is calculated, the filter should return the remaining budget.
	ForInput(ctx context.Context, versionedAttr *admission.VersionedAttributes, request *v1.AdmissionRequest, optionalVars OptionalVariableBindings, namespace *corev1.Namespace, runtimeCELCostBudget int64) ([]EvaluationResult, int64, error)

	// CompilationErrors returns a list of errors from the compilation of the evaluator
	CompilationErrors() []error
}

type FilterCompiler interface {
	// Compile is used for the cel expression compilation
	Compile(expressions []ExpressionAccessor, optionalDecls OptionalVariableDeclarations, envType environment.Type) Filter
}

type NamedExpressionAccessor interface {
	ExpressionAccessor

	GetName() string // follows the naming convention of ExpressionAccessor
}

type OptionalVariableBindings struct {
	// VersionedParams provides the "params" variable binding. This variable binding may
	// be set to nil even when OptionalVariableDeclarations.HashParams is set to true.
	VersionedParams runtime.Object
	// Authorizer provides the authorizer used for the "authorizer" and
	// "authorizer.requestResource" variable bindings. If the expression was compiled with
	// OptionalVariableDeclarations.HasAuthorizer set to true this must be non-nil.
	Authorizer authorizer.Authorizer
}

type OptionalVariableDeclarations struct {
	// HasParams specifies if the "params" variable is declared.
	// The "params" variable may still be bound to "null" when declared.
	HasParams bool
	// HasAuthorizer specifies if the"authorizer" and "authorizer.requestResource"
	// variables are declared. When declared, the authorizer variables are
	// expected to be non-null.
	HasAuthorizer bool
}