import { PdfStringFormat } from './../../fonts/pdf-string-format';
import { PdfTrueTypeFont, _UnicodeLine } from './../../fonts/pdf-standard-font';
/**
 * Renderer for right to left (RTL) scripts that handles BiDi reordering,
 * Arabic shaping, and TrueType glyph encoding needed for PDF text output.
 *
 * @private
 */
export declare class _RtlRenderer {
    /**
     * Opening bracket character for bracket pairing resolution.
     *
     * @private
     */
    _openBracket: string;
    /**
     * Closing bracket character for bracket pairing resolution.
     *
     * @private
     */
    _closeBracket: string;
    /**
     * Produces a shaped and visually ordered representation of the input line for the
     * specified font and layout settings, returning encoded chunks ready for drawing.
     * For non Unicode fonts, the input line is returned as a single chunk.
     *
     * @private
     * @param {string} line The input text line (logical order).
     * @param {PdfTrueTypeFont} font The TTF font used for shaping/encoding.
     * @param {boolean} rtl Paragraph base direction (true = RTL).
     * @param {boolean} wordSpace When true, returns an array split into characters; otherwise a single item.
     * @param {PdfStringFormat} format String format providing text direction.
     * @returns {string[]} The shaped and reordered text chunks encoded for the font.
     */
    _layout(line: string, font: PdfTrueTypeFont, rtl: boolean, wordSpace: boolean, format: PdfStringFormat): string[];
    /**
     * Splits the shaped and visually ordered result into character sized chunks,
     * suitable for per glyph placement and spacing logic.
     *
     * @private
     * @param {string} line The input text line (logical order).
     * @param {PdfTrueTypeFont} font The TTF font used for shaping/encoding.
     * @param {boolean} rtl Paragraph base direction (true = RTL).
     * @param {boolean} wordSpace When true, returns an array of single character chunks.
     * @param {PdfStringFormat} format String format providing text direction.
     * @returns {string[]} An array of encoded character chunks.
     */
    _splitLayout(line: string, font: PdfTrueTypeFont, rtl: boolean, wordSpace: boolean, format: PdfStringFormat): string[];
    /**
     * Shapes the input line, resolves glyph indices via the font's
     * TrueType reader, and returns the glyph index array packaged in `_UnicodeLine`.
     *
     * @private
     * @param {string} line The input text line to map to glyphs.
     * @param {PdfTrueTypeFont} font The TTF font used to resolve glyph indices.
     * @param {number[]} glyphs Output glyph index array (ignored on input).
     * @returns {_UnicodeLine} A result object containing the glyph index list.
     */
    _getGlyphIndex(line: string, font: PdfTrueTypeFont, glyphs: number[]): _UnicodeLine;
    /**
     * Performs RTL/BiDi visual reordering and when the full signature is used
     * Arabic shaping + TrueType encoding. When called without `font`/`wordSpace`,
     * returns a visually ordered string; otherwise returns encoded chunks.
     *
     * @private
     * @param {string} line The input text line (logical order).
     * @param {boolean} rtl Paragraph base direction (true = RTL).
     * @param {PdfStringFormat} format String format providing text direction.
     * @param {PdfTrueTypeFont} [font] The font to encode with (required when `wordSpace` is provided).
     * @param {boolean} [wordSpace] When true, returns per character encoded chunks; otherwise a single encoded string.
     * @returns {string | string[]} A visually ordered string (no `font`/`wordSpace`) or encoded chunk(s).
     */
    _customLayout(line: string, rtl: boolean, format: PdfStringFormat): string;
    _customLayout(line: string, rtl: boolean, format: PdfStringFormat, font: PdfTrueTypeFont, wordSpace: boolean): string[];
    /**
     * Encodes a string into the fonts TrueType encoding by setting symbols,
     * converting text through the TTF reader, and returning a PDF safe byte string.
     *
     * @private
     * @param {PdfTrueTypeFont} font The TrueType font used for encoding.
     * @param {string} glyphs The input text (already shaped/reordered).
     * @returns {string} The encoded string suitable for PDF content streams.
     */
    _addCharacter(font: PdfTrueTypeFont, glyphs: string): string;
    /**
     * A convenience wrapper that runs RTL reordering + shaping and splits the
     * result into per character segments.
     *
     * @private
     * @param {string} line The input text line.
     * @param {PdfTrueTypeFont} font The TrueType font.
     * @param {boolean} rtl Paragraph base direction.
     * @param {boolean} wordSpace Whether to split into single character segments.
     * @param {PdfStringFormat} format String format providing text direction.
     * @returns {string[]} The visually ordered characters.
     */
    _customSplitLayout(line: string, font: PdfTrueTypeFont, rtl: boolean, wordSpace: boolean, format: PdfStringFormat): string[];
}