import { Blank, BooleanLiteral, Empty, Expression, Identifier, Nil, IntegerLiteral, FloatLiteral, RangeLiteral, StringLiteral } from "../expression";
import { Token } from "../token";
import { ExpressionTokenStream } from "./tokens";
export type Tokenizer = (expression: string, startIndex?: number) => Generator<Token>;
export declare const IDENTIFIER_PATTERN = "[a-zA-Z_][\\w\\-]*\\??";
export declare const ASSIGN_IDENTIFIER_PATTERN = "[0-9a-zA-Z_][\\w\\-]*";
export declare const IDENT_STRING_PATTERN: string;
export declare const IDENT_INDEX_PATTERN = "\\[\\s*(?<identIndex>\\-?\\d+)\\s*]";
export declare const STRING_PATTERN: string;
export declare function parseBoolean(stream: ExpressionTokenStream): BooleanLiteral;
export declare function parseNil(): Nil;
export declare function parseEmpty(): Empty;
export declare function parseBlank(): Blank;
export declare function parseStringLiteral(stream: ExpressionTokenStream): StringLiteral;
export declare function parseIntegerLiteral(stream: ExpressionTokenStream): IntegerLiteral;
export declare function parseFloatLiteral(stream: ExpressionTokenStream): FloatLiteral;
export declare const IDENT_TOKENS: Set<string>;
export declare function parseIdentifier(stream: ExpressionTokenStream): Identifier;
/**
 *
 * @param stream -
 * @returns
 */
export declare function parseStringOrIdentifier(stream: ExpressionTokenStream): StringLiteral | Identifier;
/**
 *
 * @param stream -
 * @returns
 */
export declare function parseUnchainedIdentifier(stream: ExpressionTokenStream): Identifier;
/**
 *
 * @param parseObj -
 * @returns
 */
export declare function makeParseRange(parseObj: (stream: ExpressionTokenStream) => Expression, expectToken?: string): (stream: ExpressionTokenStream) => RangeLiteral;