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114 lines
3.6 KiB
Plaintext
114 lines
3.6 KiB
Plaintext
import type { IGetToken } from '@tokenizer/token';
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export interface IFileInfo {
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/**
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* File size in bytes
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*/
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size?: number;
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/**
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* MIME-type of file
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*/
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mimeType?: string;
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/**
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* File path
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*/
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path?: string;
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/**
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* File URL
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*/
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url?: string;
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}
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export interface IReadChunkOptions {
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/**
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* The offset in the buffer to start writing at; default is 0
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*/
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offset?: number;
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/**
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* Number of bytes to read.
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*/
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length?: number;
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/**
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* Position where to begin reading from the file.
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* Default it is `tokenizer.position`.
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* Position may not be less then `tokenizer.position`.
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*/
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position?: number;
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/**
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* If set, will not throw an EOF error if not all of the requested data could be read
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*/
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mayBeLess?: boolean;
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}
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/**
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* The tokenizer allows us to read or peek from the tokenizer-stream.
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* The tokenizer-stream is an abstraction of a stream, file or Buffer.
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*/
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export interface ITokenizer {
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/**
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* Provide access to information of the underlying information stream or file.
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*/
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fileInfo: IFileInfo;
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/**
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* Offset in bytes (= number of bytes read) since beginning of file or stream
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*/
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position: number;
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/**
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* Peek (read ahead) buffer from tokenizer
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* @param buffer - Target buffer to fill with data peek from the tokenizer-stream
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* @param options - Read behaviour options
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* @returns Promise with number of bytes read
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*/
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peekBuffer(buffer: Uint8Array, options?: IReadChunkOptions): Promise<number>;
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/**
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* Peek (read ahead) buffer from tokenizer
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* @param buffer - Target buffer to fill with data peeked from the tokenizer-stream
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* @param options - Additional read options
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* @returns Promise with number of bytes read
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*/
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readBuffer(buffer: Uint8Array, options?: IReadChunkOptions): Promise<number>;
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/**
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* Peek a token from the tokenizer-stream.
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* @param token - Token to peek from the tokenizer-stream.
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* @param position - Offset where to begin reading within the file. If position is null, data will be read from the current file position.
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* @param maybeless - If set, will not throw an EOF error if the less then the requested length could be read.
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*/
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peekToken<T>(token: IGetToken<T>, position?: number | null, maybeless?: boolean): Promise<T>;
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/**
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* Read a token from the tokenizer-stream.
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* @param token - Token to peek from the tokenizer-stream.
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* @param position - Offset where to begin reading within the file. If position is null, data will be read from the current file position.
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*/
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readToken<T>(token: IGetToken<T>, position?: number): Promise<T>;
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/**
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* Peek a numeric token from the stream
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* @param token - Numeric token
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* @returns Promise with number
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*/
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peekNumber(token: IGetToken<number>): Promise<number>;
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/**
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* Read a numeric token from the stream
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* @param token - Numeric token
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* @returns Promise with number
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*/
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readNumber(token: IGetToken<number>): Promise<number>;
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/**
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* Ignore given number of bytes
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* @param length - Number of bytes ignored
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*/
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ignore(length: number): Promise<number>;
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/**
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* Clean up resources.
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* It does not close the stream for StreamReader, but is does close the file-descriptor.
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*/
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close(): Promise<void>;
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}
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export type OnClose = () => Promise<void>;
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export interface ITokenizerOptions {
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/**
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* Pass additional file information to the tokenizer
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*/
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fileInfo?: IFileInfo;
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/**
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* On tokenizer close handler
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*/
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onClose?: OnClose;
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}
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