import { Token } from "../lexer";
/**
 * A set of operations that must be implemented to properly handle conditional compilation chunks.
 *
 */
export interface Visitor {
    visitBrightScript(chunk: BrightScript): Token[];
    visitDeclaration(chunk: Declaration): Token[];
    visitIf(chunk: If): Token[];
    visitError(chunk: Error): never;
}
/**
 * The base construct of the conditional-compilation preprocessor. Represents one of many things,
 * but typically has a one-to-many relationship with tokens in the input BrightScript files.
 */
export interface Chunk {
    accept(visitor: Visitor): Token[];
}
/** A series of BrightScript tokens that will be parsed and interpreted directly. */
export declare class BrightScript implements Chunk {
    readonly tokens: Token[];
    constructor(tokens: Token[]);
    accept(visitor: Visitor): Token[];
}
/**
 * A conditional compilation directive that declares a constant value that's in-scope only during
 * preprocessing.
 *
 * Typically takes the form of:
 *
 * @example
 * #const foo = true
 */
export declare class Declaration implements Chunk {
    readonly name: Token;
    readonly value: Token;
    constructor(name: Token, value: Token);
    accept(visitor: Visitor): Token[];
}
/**
 * The combination of a conditional compilation value (or identifier) and the chunk to include if
 * `condition` evaluates to `true`.
 */
export interface HashElseIf {
    condition: Token;
    thenChunks: Chunk[];
}
/**
 * A directive that adds the "conditional" to "conditional compilation". Typically takes the form
 * of:
 *
 * @example
 * #if foo
 *     someBrightScriptGoesHere()
 * #else if bar
 *     compileSomeOtherCode()
 * #else
 *     otherwise("compile this!")
 * #end if
 */
export declare class If implements Chunk {
    readonly condition: Token;
    readonly thenChunks: Chunk[];
    readonly elseIfs: HashElseIf[];
    readonly elseChunks?: Chunk[] | undefined;
    constructor(condition: Token, thenChunks: Chunk[], elseIfs: HashElseIf[], elseChunks?: Chunk[] | undefined);
    accept(visitor: Visitor): Token[];
}
/**
 * A forced BrightScript compilation error with a message attached.  Typically takes the form of:
 *
 * @example
 * #error Some message describing the error goes here.
 */
export declare class Error implements Chunk {
    readonly hashError: Token;
    readonly message: string;
    constructor(hashError: Token, message: string);
    accept(visitor: Visitor): never;
}