import type { GlyphInfo } from "../../types.ts";
/**
 * Mongolian shaper
 * Handles Traditional Mongolian, Manchu, and Sibe scripts
 *
 * Mongolian is written vertically (top to bottom, left to right columns).
 * Like Arabic, it has context-sensitive letter forms:
 * - Initial, Medial, Final, and Isolated forms
 *
 * Key characteristics:
 * - Vertical writing
 * - Positional forms (like Arabic joining)
 * - Free variation selectors (FVS1-FVS4)
 * - Vowel separators (MVS, NNBSP)
 */
/**
 * Mongolian character categories
 */
export declare enum MongolianCategory {
    Other = 0,
    Letter = 1,// Regular letters
    Vowel = 2,// Vowels
    Digit = 3,// Digits
    Punctuation = 4,// Punctuation
    FVS = 5,// Free Variation Selector
    MVS = 6,// Mongolian Vowel Separator (180E)
    NNBSP = 7,// Narrow No-Break Space (202F)
    ZWJ = 8,// Zero Width Joiner
    ZWNJ = 9
}
/**
 * Mongolian joining types (like Arabic)
 */
export declare enum MongolianJoining {
    NonJoining = 0,
    RightJoining = 1,// Joins to right (previous in text order)
    DualJoining = 2,// Joins both sides
    LeftJoining = 3,// Joins to left (next in text order) - rare
    Transparent = 4,// Invisible control characters
    Causing = 5
}
/**
 * Get Mongolian category
 */
export declare function getMongolianCategory(cp: number): MongolianCategory;
/**
 * Get Mongolian joining type for a codepoint
 */
export declare function getMongolianJoining(cp: number): MongolianJoining;
/**
 * Mongolian positional forms
 */
export declare enum MongolianForm {
    Isolated = 0,
    Initial = 1,
    Medial = 2,
    Final = 3
}
/**
 * Determine positional form for a Mongolian character
 */
export declare function getMongolianForm(prev: MongolianJoining, current: MongolianJoining, next: MongolianJoining): MongolianForm;
/**
 * Mongolian feature masks
 */
export declare const MongolianFeatureMask: {
    readonly ccmp: 1;
    readonly locl: 2;
    readonly isol: 4;
    readonly init: 8;
    readonly medi: 16;
    readonly fina: 32;
    readonly rlig: 64;
    readonly calt: 128;
    readonly liga: 256;
    readonly vert: 512;
};
/**
 * Set up masks for Mongolian shaping
 */
export declare function setupMongolianMasks(infos: GlyphInfo[]): void;
/**
 * Get default Mongolian features in order
 */
export declare function getMongolianFeatures(): string[];
/**
 * Check if script uses Mongolian shaper
 */
export declare function usesMongolian(script: string): boolean;