import { BufferFlags, ClusterLevel, Direction, type GlyphInfo } from "../types.ts";
/**
 * Input buffer for text to be shaped.
 * Holds Unicode codepoints with associated properties.
 */
export declare class UnicodeBuffer {
    private _direction;
    private _script;
    private _language;
    private _clusterLevel;
    private _flags;
    /** Codepoints to shape */
    readonly codepoints: number[];
    /** Cluster indices (maps each codepoint to its cluster) */
    readonly clusters: number[];
    /** Pre-context (text before the buffer for contextual shaping) */
    preContext: number[];
    /** Post-context (text after the buffer for contextual shaping) */
    postContext: number[];
    /** Add a string to the buffer */
    addStr(text: string, startCluster?: number): this;
    /** Append to existing buffer (slower path) */
    private _addStrAppend;
    /** Add codepoints directly */
    addCodepoints(codepoints: number[], startCluster?: number): this;
    /** Add a single codepoint */
    addCodepoint(codepoint: number, cluster?: number): this;
    /** Set text direction */
    setDirection(direction: Direction): this;
    /** Set script (ISO 15924 tag, e.g., 'Latn', 'Arab') */
    setScript(script: string): this;
    /** Set language (BCP 47 tag, e.g., 'en', 'ar') */
    setLanguage(language: string | null): this;
    /** Set cluster level */
    setClusterLevel(level: ClusterLevel): this;
    /** Set buffer flags */
    setFlags(flags: BufferFlags): this;
    /** Set pre-context string */
    setPreContext(text: string): this;
    /** Set post-context string */
    setPostContext(text: string): this;
    /** Clear the buffer */
    clear(): this;
    /** Number of codepoints */
    get length(): number;
    get direction(): Direction;
    get script(): string;
    get language(): string | null;
    get clusterLevel(): ClusterLevel;
    get flags(): BufferFlags;
    /** Convert to initial glyph infos (codepoint = glyphId initially) */
    toGlyphInfos(): GlyphInfo[];
}