/**
 * Numeric literals: the decimal and radix forms, the `_` separators a reader
 * groups digits with, the suffix a target may own, and the `#rrggbb` colour
 * literal that is spelled like one.
 *
 * D115 §三 / D114 R1f: the number half of `lexer.ts`.
 */
import { type Diagnostic } from "../diagnostic.ts";
import { type Token } from "../token.ts";
/** Everything this half of the lexer asks of the scanner that hosts it, and nothing more. */
export interface NumberScannerHost {
    advance(): string;
    readonly diagnostics: {
        push(...reports: readonly Diagnostic[]): void;
    };
    index: number;
    isDigit(character: string): boolean;
    isIdentifierPart(character: string): boolean;
    isIdentifierStart(character: string): boolean;
    readonly numericSuffixes: ReadonlySet<string>;
    peek(offset?: number): string;
    readonly text: string;
    readonly tokens: Token[];
}
export declare class NumberScanner {
    private readonly host;
    constructor(host: NumberScannerHost);
    readNumber(): void;
    readRadixNumber(): void;
    /**
     * A number token, carrying the author's own spelling whenever the value it
     * holds is spelled differently — `1_000` loses its separators and `0X20`
     * loses its uppercase prefix on the way to the token. D90 R6 quotes the
     * literal back when it is not exactly representable, and it must quote what
     * was written: reporting `'10000000000000000001'` for a source line that
     * reads `1_000_000_000_000_000_000_1` sends the author looking for text that
     * is not there.
     */
    private pushNumber;
    private isRadixDigit;
    /**
     * LOK-I5: `%` right after a number is the percentage unit only where a
     * remainder operator could not stand — the operator always takes a right
     * operand, so a `%` followed by a line end, a closing bracket, or a
     * separator is a unit spelling and nothing else.
     */
    private isPercentUnitPosition;
    readLeadingDotNumber(): void;
    private readDigitsWithSeparators;
    readHexColor(start: number): boolean;
}
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