import type { uint16 } from "../../types.ts";
import type { Reader } from "../binary/reader.ts";
/**
 * JSTF table - Justification data
 * Provides justification alternatives for scripts
 */
/** Justification priority levels */
export declare const JstfPriority: {
    /** Shrink GPOS lookups */
    readonly ShrinkGpos: 0;
    /** Disable GPOS lookups */
    readonly DisableGpos: 1;
    /** Shrink GSUB lookups */
    readonly ShrinkGsub: 2;
    /** Disable GSUB lookups */
    readonly DisableGsub: 3;
    /** Enable GPOS lookups */
    readonly EnableGpos: 4;
    /** Enable GSUB lookups */
    readonly EnableGsub: 5;
    /** Max extension GPOS lookups */
    readonly MaxExtendGpos: 6;
    /** Max extension GSUB lookups */
    readonly MaxExtendGsub: 7;
};
/** JstfMax table - lookup indices for maximum extension */
export interface JstfMax {
    lookupIndices: uint16[];
}
/** JstfModList - enable/disable lookup list */
export interface JstfModList {
    lookupIndices: uint16[];
}
/** Justification priority record */
export interface JstfPriorityRecord {
    /** GSUB lookups to enable for shrinkage */
    shrinkageEnableGsub: JstfModList | null;
    /** GSUB lookups to disable for shrinkage */
    shrinkageDisableGsub: JstfModList | null;
    /** GPOS lookups to enable for shrinkage */
    shrinkageEnableGpos: JstfModList | null;
    /** GPOS lookups to disable for shrinkage */
    shrinkageDisableGpos: JstfModList | null;
    /** Maximum shrinkage GSUB */
    shrinkageJstfMax: JstfMax | null;
    /** GSUB lookups to enable for extension */
    extensionEnableGsub: JstfModList | null;
    /** GSUB lookups to disable for extension */
    extensionDisableGsub: JstfModList | null;
    /** GPOS lookups to enable for extension */
    extensionEnableGpos: JstfModList | null;
    /** GPOS lookups to disable for extension */
    extensionDisableGpos: JstfModList | null;
    /** Maximum extension GSUB */
    extensionJstfMax: JstfMax | null;
}
/** Justification language system */
export interface JstfLangSys {
    priorities: JstfPriorityRecord[];
}
/** Justification script record */
export interface JstfScriptRecord {
    scriptTag: number;
    /** Extender glyphs for Kashida-like justification */
    extenderGlyphs: uint16[];
    /** Default language system */
    defaultLangSys: JstfLangSys | null;
    /** Language-specific systems */
    langSysRecords: Map<number, JstfLangSys>;
}
/** JSTF table */
export interface JstfTable {
    majorVersion: uint16;
    minorVersion: uint16;
    scripts: JstfScriptRecord[];
}
export declare function parseJstf(reader: Reader): JstfTable;
/** Get extender glyphs for a script (e.g., Kashida for Arabic) */
export declare function getExtenderGlyphs(jstf: JstfTable, scriptTag: number): uint16[];
/** Get justification priorities for a script/language */
export declare function getJstfPriorities(jstf: JstfTable, scriptTag: number, languageTag?: number): JstfPriorityRecord[];
/** Get lookup modifications for shrinkage at a given priority level */
export declare function getShrinkageMods(priority: JstfPriorityRecord): {
    enableGsub: uint16[];
    disableGsub: uint16[];
    enableGpos: uint16[];
    disableGpos: uint16[];
    maxLookups: uint16[];
};
/** Get lookup modifications for extension at a given priority level */
export declare function getExtensionMods(priority: JstfPriorityRecord): {
    enableGsub: uint16[];
    disableGsub: uint16[];
    enableGpos: uint16[];
    disableGpos: uint16[];
    maxLookups: uint16[];
};