import { TokenType } from '../lexer/Token';
import { Parser } from '../Parser';
import { Precedence } from '../Precedence';
import { IntermediateResult } from '../result/IntermediateResult';
/**
 * Each ParsletFunction can be called during the prefix or infix parsing step. In the prefix parsing step the `left` value
 * will be null and in the infix parsing step it value contain the previous value.
 * If the current state of the lexer in the current step is not accepted then the function should return `null`.
 * In the infix parsing step the current precedence should be checked.
 * See {@link composeParslet} for a more convenient way to use this function.
 */
export type ParsletFunction = (parser: Parser, precedence: Precedence, left: IntermediateResult | null) => IntermediateResult | null;
interface BaseComposeParsletOptions {
    name: string;
    accept: (type: TokenType, next: TokenType) => boolean;
}
type ComposePrefixParsletOptions = BaseComposeParsletOptions & {
    parsePrefix: (parser: Parser) => IntermediateResult;
};
type ComposeInfixParsletOptions = BaseComposeParsletOptions & {
    precedence: Precedence;
    parseInfix: (parser: Parser, left: IntermediateResult) => IntermediateResult;
};
export type ComposeParsletOptions = ComposePrefixParsletOptions | ComposeInfixParsletOptions | (ComposePrefixParsletOptions & ComposeInfixParsletOptions);
export declare function composeParslet(options: ComposeParsletOptions): ParsletFunction;
export {};
