/// <reference types="node" />
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/** Supported representations of encoded text. */
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export declare type BufferLike = Buffer | Uint8Array | DataView | ArrayBufferLike;
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/**
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* A character encoding, known to the Core Foundation framework.
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*
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* @remarks
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* Each instance of this class represents a {@link https://developer.apple.com/documentation/corefoundation/cfstringencoding?language=objc | CFStringEncoding} value.
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*/
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export declare class StringEncoding {
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/** Instances of this class cannot be constructed directly. */
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private constructor();
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/**
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* The numeric identifier of this {@link StringEncoding}.
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*
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* @remarks
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* This corresponds to the Core Foundation type {@link https://developer.apple.com/documentation/corefoundation/cfstringencoding?language=objc | CFStringEncoding}.
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*
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* Note that this is not a *unique* identifier. Core Foundation interprets many different values as Mac OS Roman. The `name` is more likely (though still not guaranteed) to be truly unique.
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*/
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readonly cfStringEncoding: number;
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/**
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* The IANA character set name that is the closest mapping to this {@link StringEncoding}.
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*
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* @remarks
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* This is the return value of the Core Foundation function {@link https://developer.apple.com/documentation/corefoundation/1542710-cfstringconvertencodingtoianacha?language=objc | CFStringConvertEncodingToIANACharSetName}.
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*/
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readonly ianaCharSetName: string;
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/**
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* The Windows codepage that is the closest mapping to this {@link StringEncoding}.
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*
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* @remarks
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* This is the return value of the Core Foundation function {@link https://developer.apple.com/documentation/corefoundation/1543125-cfstringconvertencodingtowindows?language=objc | CFStringConvertEncodingToWindowsCodepage}.
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*/
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readonly windowsCodepage: number | null;
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/**
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* The Cocoa encoding constant that is the closest mapping to this {@link StringEncoding}.
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*
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* @remarks
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* This is the return value of the Core Foundation function {@link https://developer.apple.com/documentation/corefoundation/1543046-cfstringconvertencodingtonsstrin?language=objc | CFStringConvertEncodingToNSStringEncoding}.
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*/
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readonly nsStringEncoding: number | null;
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/**
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* The canonical name of this {@link StringEncoding}. This is likely (but not guaranteed) to be a unique identifier for each distinct encoding.
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*
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* @remarks
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* This is the return value of the Core Foundation function {@link https://developer.apple.com/documentation/corefoundation/1543585-cfstringgetnameofencoding?language=objc | CFStringGetNameOfEncoding}.
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*/
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readonly name: string;
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/**
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* Decodes the given text.
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*
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* @remarks
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* Throws {@link InvalidEncodedTextError} if the `text` is not valid in this encoding.
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*
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* @param text - The encoded text.
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* @param options - Options for decoding.
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* @returns The decoded text, as a string.
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*/
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decode(text: BufferLike, options?: DecodeOptions): string;
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/**
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* Returns whether the given {@link StringEncoding} represents the same encoding as this one.
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*
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* @remarks
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* The Core Foundation framework doesn't have a corresponding function. Instead, this method is implemented by comparing the {@link StringEncoding.cfStringEncoding | cfStringEncoding} and {@link StringEncoding.name | name} properties.
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*/
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equals(other: StringEncoding): boolean;
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/**
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* Encodes the given text.
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*
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* @remarks
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* Throws {@link NotRepresentableError} if the `text` cannot be fully represented in this encoding, and `options` does not contain a `lossByte`.
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*
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* @param text - The text to encode.
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* @param options - Options for encoding.
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* @returns The encoded text, in a `Buffer`.
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*/
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encode(text: string, options?: EncodeOptions): Buffer;
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/**
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* Looks up a {@link StringEncoding} by its {@link https://developer.apple.com/documentation/corefoundation/cfstringencoding?language=objc | numeric identifier}.
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*
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* @remarks
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* Throws {@link UnrecognizedEncodingError} if not recognized and supported.
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*
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* @returns The found {@link StringEncoding}.
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*/
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static byCFStringEncoding(id: number): StringEncoding;
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/**
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* Looks up a {@link StringEncoding} by corresponding IANA character set identifier.
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*
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* @remarks
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* Throws {@link UnrecognizedEncodingError} if not recognized and supported.
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*
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* This uses the Core Foundation function {@link https://developer.apple.com/documentation/corefoundation/1542975-cfstringconvertianacharsetnameto?language=objc | CFStringConvertIANACharSetNameToEncoding}.
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*
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* @returns The found {@link StringEncoding}.
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*/
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static byIANACharSetName(charset: string): StringEncoding;
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/**
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* Looks up a {@link StringEncoding} by corresponding Windows codepage.
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*
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* @remarks
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* Throws {@link UnrecognizedEncodingError} if not recognized and supported.
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*
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* This uses the Core Foundation function {@link https://developer.apple.com/documentation/corefoundation/1542113-cfstringconvertwindowscodepageto?language=objc | CFStringConvertWindowsCodepageToEncoding}.
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*
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* @returns The found {@link StringEncoding}.
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*/
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static byWindowsCodepage(codepage: number): StringEncoding;
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/**
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* Looks up a {@link StringEncoding} by corresponding Cocoa encoding constant.
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*
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* @remarks
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* Throws {@link UnrecognizedEncodingError} if not recognized and supported.
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*
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* This uses the Core Foundation function {@link https://developer.apple.com/documentation/corefoundation/1542787-cfstringconvertnsstringencodingt?language=objc | CFStringConvertNSStringEncodingToEncoding}.
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*
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* @returns The found {@link StringEncoding}.
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*/
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static byNSStringEncoding(nsStringEncoding: number): StringEncoding;
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/**
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* The default {@link StringEncoding} used by the operating system when it creates strings.
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*
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* @remarks
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* This uses the Core Foundation function {@link https://developer.apple.com/documentation/corefoundation/1541720-cfstringgetsystemencoding?language=objc | CFStringGetSystemEncoding}.
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*/
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static readonly system: StringEncoding;
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}
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/** An object containing some encoded text in a `Buffer`, along with the encoding used. */
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export interface TextAndEncoding {
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/** The encoding of the `text`. */
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encoding: StringEncoding;
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/** The encoded text. */
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text: Buffer;
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}
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/**
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* Encodes the given text, using the smallest representation supported by Core Foundation.
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*
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* @param text - The text to encode.
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* @param options - Options for encoding.
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* @returns The encoded text and chosen encoding.
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*/
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export declare function encodeSmallest(text: string, options?: SelectAndEncodeOptions & {
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isEncodingOk?: never;
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}): TextAndEncoding;
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/**
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* Encodes the given text, using the smallest representation supported by Core Foundation.
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*
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* @param text - The text to encode.
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* @param options - Options for encoding, possibly including an {@link SelectAndEncodeOptions.isEncodingOk | options.isEncodingOk} method.
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* @returns If {@link SelectAndEncodeOptions.isEncodingOk | options.isEncodingOk} exists and returns `false`, this function returns `null`. Otherwise, this function returns the encoded text and chosen encoding.
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*/
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export declare function encodeSmallest(text: string, options: SelectAndEncodeOptions): TextAndEncoding | null;
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/**
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* Converts encoded text from one encoding to another.
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*
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* @remarks
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* This is faster than decoding to a JavaScript string and then encoding the string.
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*
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* Throws {@link InvalidEncodedTextError} if the `text` is not valid in `fromEncoding`.
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*
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* Throws {@link NotRepresentableError} if the `text` cannot be fully represented in `toEncoding`, and `options` does not contain a `lossByte`.
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*
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* @param text - The encoded text to transcode.
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* @param fromEncoding - The encoding of the `text`, as a {@link StringEncoding} or an IANA character set name.
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* @param toEncoding - The desired encoding, as a {@link StringEncoding} or an IANA character set name.
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* @param options - Options for both decoding and encoding.
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* @returns The `text`, encoded in `toEncoding` instead of `fromEncoding`.
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*/
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export declare function transcode(text: BufferLike, fromEncoding: StringEncoding | string, toEncoding: StringEncoding | string, options?: DecodeOptions & EncodeOptions): Buffer;
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/**
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* Converts encoded text from its current encoding to the smallest representation supported by Core Foundation.
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*
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* @remarks
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* Throws {@link InvalidEncodedTextError} if the `text` is not valid in `fromEncoding`.
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*
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* @param text - The text to encode.
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* @param fromEncoding - The encoding of the text, as a {@link StringEncoding} or an IANA character set name.
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* @param options - Options for both decoding and encoding.
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* @returns The encoded text and chosen encoding.
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*/
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export declare function transcodeSmallest(text: BufferLike, fromEncoding: StringEncoding | string, options?: DecodeOptions & SelectAndEncodeOptions & {
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isEncodingOk?: never;
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}): TextAndEncoding;
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/**
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* Converts encoded text from its current encoding to the smallest representation supported by Core Foundation.
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*
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* @remarks
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* Throws {@link InvalidEncodedTextError} if the `text` is not valid in `fromEncoding`.
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*
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* @param text - The text to encode.
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* @param fromEncoding - The encoding of the text, as a {@link StringEncoding} or an IANA character set name.
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* @param options - Options for both decoding and encoding, possibly including an {@link SelectAndEncodeOptions.isEncodingOk | options.isEncodingOk} method.
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* @returns If {@link SelectAndEncodeOptions.isEncodingOk | options.isEncodingOk} exists and returns `false`, this function returns `null`. Otherwise, this function returns the encoded text and chosen encoding.
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*/
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export declare function transcodeSmallest(text: BufferLike, fromEncoding: StringEncoding | string, options: DecodeOptions & SelectAndEncodeOptions): TextAndEncoding | null;
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/**
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* Tests whether an encoding exists and is supported.
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*
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* @param encoding - The IANA character set name of the encoding.
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*/
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export declare function encodingExists(encoding: string): boolean;
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/**
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* Options for decoding.
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*
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* @remarks
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* This interface is an empty placeholder, as there are currently no pertinent decoding options supported by Core Foundation.
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*/
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export interface DecodeOptions {
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}
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/** Options for encoding. */
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export interface EncodeOptions {
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/**
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* Substitute for unrepresentable characters.
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*
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* @remarks
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* If the input text contains a character that is not representable in the output encoding, then this byte will be inserted as a placeholder in the output text.
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*
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* This property, if present, must be an integer between 1 and 255, inclusive.
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*/
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lossByte?: number;
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}
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/** Additional options for encoding with `encodeSmallest` and `transcodeSmallest`. */
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export interface SelectAndEncodeOptions extends EncodeOptions {
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/**
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* Decides whether to encode with the given {@link StringEncoding}.
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*
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* @remarks
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* This method is called by `encodeSmallest` and `transcodeSmallest` to let the application decide whether to proceed with Core Foundation's chosen smallest encoding, before actually performing the work of encoding the text.
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*
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* @param encoding - The selected {@link StringEncoding}.
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* @returns `true` if the text should be encoded; `false` to abort encoding. If this method returns `false`, then the calling function (`encodeSmallest` or `transcodeSmallest`) will return `null` instead of the encoded text.
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*/
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isEncodingOk?(encoding: StringEncoding): boolean;
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}
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//# sourceMappingURL=native.d.ts.map
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