import type { NodeId } from '../../r-bridge/lang-4.x/ast/model/processing/node-id';
import type { REnvironmentInformation } from '../../dataflow/environments/environment';
/**
 * Represents a node during the slicing process, together with the environment it is traversed in
 * (modified by function calls) and whether it is only used for its side effects.
 */
export interface NodeToSlice {
    readonly id: NodeId;
    /** used for calling context, etc. */
    readonly baseEnvironment: REnvironmentInformation;
    /** the fingerprint of the environment */
    readonly envFingerprint: string;
    /** if we add a function call, we may need it only for its side effects (e.g., a redefinition of a global variable), if so, 'returns' links will not be traced */
    readonly onlyForSideEffects: boolean;
}
/**
 * How far a traversal got before it was cut short, so a caller can judge a truncated slice instead of
 * having to drop it: a `frontier` of `0` means the queue drained after all, and a small `frontier` next to
 * a large `visited` says little is missing.
 */
export interface SliceProgress {
    /** queue entries the traversal expanded */
    readonly visited: number;
    /** entries still queued when it stopped */
    readonly frontier: number;
}
/**
 * The result of the slice step
 */
export interface SliceResult {
    /**
     * Number of times the set threshold was hit (i.e., the same node was visited too often).
     * While any number above 0 might indicate a wrong slice, it does not have to as usually even revisiting the same node
     * seldom causes more ids to be included in the slice.
     */
    readonly timesHitThreshold: number;
    /**
     * The ids of the nodes in the normalized ast that are part of the slice.
     */
    readonly result: ReadonlySet<NodeId>;
    /**
     * The ids of the nodes in the normalized ast that were used as seed ids for slicing. This is a subset of {@link result}.
     */
    readonly slicedFor: readonly NodeId[];
    /**
     * Set when the {@link GasFeatureKey.Slicer|gas guard} stopped the traversal before the queue drained, so
     * {@link result} is what was reached until then and not the complete slice.
     */
    readonly stoppedEarly?: boolean;
    /** How far the traversal got, set exactly when {@link stoppedEarly} is. */
    readonly progress?: SliceProgress;
    /**
     * The names the slice reads without defining them, so running it on its own would fail with
     * `object 'x' not found`. Empty when the slice is closed under the names it uses.
     */
    readonly freeNames?: readonly string[];
}