import { WCharacterFormat } from '../index';
import { TextElementBox, ListTextElementBox, ParagraphWidget } from './page';
import { DocumentHelper } from './viewer';
import { LtrRtlTextInfo, RtlInfo } from '../editor/editor-helper';
import { BiDirectionalOverride, CharacterRangeType, FontScriptType } from '../../index';
/**
 * @private
 */
export interface TextSizeInfo {
    Height?: number;
    BaselineOffset?: number;
    Width?: number;
}
/**
 * @private
 */
export interface FontSizeInfo {
    HeightFactor?: number;
    BaselineFactor?: number;
}
/**
 * @private
 */
export interface TextHeightInfo {
    [key: string]: TextSizeInfo;
}
/**
 * @private
 */
export interface FontHeightInfo {
    [key: string]: FontSizeInfo;
}
/**
 * @private
 */
export declare class TextHelper {
    private documentHelper;
    private context;
    private paragraphMarkInfo;
    private static wordSplitCharacters;
    private static numberNonReversingCharacters;
    private readonly paragraphMark;
    private readonly lineBreakMark;
    getEnSpaceCharacter(): string;
    repeatChar(char: string, count: number): string;
    constructor(documentHelper: DocumentHelper);
    getParagraphMarkWidth(characterFormat: WCharacterFormat): number;
    getParagraphMarkSize(characterFormat: WCharacterFormat): TextSizeInfo;
    getTextSize(elementBox: TextElementBox, characterFormat: WCharacterFormat): number;
    getHeight(characterFormat: WCharacterFormat, scriptType?: FontScriptType): TextSizeInfo;
    getFormatText(characterFormat: WCharacterFormat, fontToRender?: string): string;
    measureTextExcludingSpaceAtEnd(text: string, characterFormat: WCharacterFormat, scriptType: FontScriptType): number;
    getWidth(text: string, characterFormat: WCharacterFormat, scriptType?: FontScriptType): number;
    setText(textToRender: string, isBidi: boolean, bdo: BiDirectionalOverride, isRender?: boolean): string;
    measureText(text: string, characterFormat: WCharacterFormat, scriptType?: FontScriptType): TextSizeInfo;
    updateTextSize(elementBox: ListTextElementBox, paragraph: ParagraphWidget): void;
    containsSpecialCharAlone(text: string): boolean;
    containsNumberAlone(text: string): boolean;
    containsCombinationText(element: TextElementBox): boolean;
    inverseCharacter(ch: string): string;
    containsSpecialChar(text: string): boolean;
    /**
     * @private
     * @param {string} text - Specifies the text
     * @returns {boolean} - Returns true if given text it right to left.
     */
    isRTLText(text: string): boolean;
    /**
     * @private
     * @param {string} text - Specifies the text
     * @param {FontScriptType} scriptType - Specifies the script type
     * @returns {boolean} - Returns true if given text is unicode text.
     */
    isUnicodeText(text: string, scriptType: FontScriptType): boolean;
    /**
     * @private
     * @param {string} text - Specifies the text
     * @returns {RtlInfo} - Returns the text info.
     */
    getRtlLanguage(text: string): RtlInfo;
    /**
     * @private
     */
    splitTextByConsecutiveLtrAndRtl(text: string, isTextBidi: boolean, isRTLLang: boolean, characterRangeTypes: CharacterRangeType[], isPrevLTRText: LtrRtlTextInfo, hasRTLCharacter: LtrRtlTextInfo): string[];
    /**
     * @private
     */
    isRightToLeftLanguage(lang: number): boolean;
    private isNumber;
    /**
     * @private
     */
    isWordSplitChar(character: string): boolean;
    /**
     * @private
     */
    static isNumberNonReversingCharacter(character: string, isTextBidi: boolean): boolean;
    /**
     * @private
     */
    isNonWordSplitCharacter(character: string): boolean;
    getFontNameToRender(scriptType: FontScriptType, charFormat: WCharacterFormat): string;
    private isEastAsiaScript;
    private getFontNameEAToRender;
    private getFontNameAsciiToRender;
    private getFontNameBidiToRender;
    private getFontNameFromTheme;
    private updateFontNameFromTheme;
    private getFontNameWithFontScript;
    destroy(): void;
}