import type { IAlternative } from "../types.js";
import type { IAttribute } from "./IAttribute.js";
import type { IAttributeResolver } from "./IAttributeResolver.js";
import { LabelElementPair } from "./LabelElementPair.js";
import { Rule } from "./Rule.js";
import { ActionAST } from "./ast/ActionAST.js";
import { AltAST } from "./ast/AltAST.js";
import { GrammarAST } from "./ast/GrammarAST.js";
import { TerminalAST } from "./ast/TerminalAST.js";
/** An outermost alternative for a rule.  We don't track inner alternatives. */
export declare class Alternative implements IAttributeResolver, IAlternative {
    ast: AltAST;
    /** Token IDs, string literals in this alt. */
    readonly tokenRefs: Map<string, TerminalAST[]>;
    /** Does not include labels. */
    readonly tokenRefsInActions: Map<string, GrammarAST[]>;
    /** All rule refs in this alt. */
    readonly ruleRefs: Map<string, GrammarAST[]>;
    readonly ruleRefsInActions: Map<string, GrammarAST[]>;
    /** A list of all LabelElementPair attached to tokens like id=ID, ids+=ID */
    readonly labelDefs: Map<string, LabelElementPair[]>;
    /**
     * Track all executable actions other than named actions like `@init` and catch/finally (not in an alt).
     * Also tracks predicates, rewrite actions. We need to examine these actions before code generation so
     * that we can detect refs to $rule.attr etc...
     *
     * This tracks per alt.
     */
    actions: ActionAST[];
    /** What alternative number is this outermost alt? Used in templates. */
    altNum: number;
    private rule;
    constructor(r: Rule, altNum: number);
    resolvesToToken(x: string, node: ActionAST): boolean;
    resolvesToAttributeDict(x: string, node: ActionAST): boolean;
    /**
       $x Attribute: rule arguments, return values, predefined rule prop.
     */
    resolveToAttribute(x: string, node: ActionAST): IAttribute | null;
    /**
     * $x.y, x can be surrounding rule, token/rule/label ref. y is visible
     *  attr in that dictionary.  Can't see args on rule refs.
     */
    resolveToAttribute(x: string, y: string, node: ActionAST): IAttribute | null;
    resolvesToLabel(x: string, node: ActionAST): boolean;
    resolvesToListLabel(x: string, node: ActionAST): boolean;
    getAnyLabelDef(x: string): LabelElementPair | null;
    /** x can be rule ref or rule label. */
    resolveToRule(x: string): Rule | null;
}