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Viewing file:     AbstractTokenizer.js (3.62 KB)      -rw-r--r--

import { EndOfStreamError } from './stream/index.js';
/**
 * Core tokenizer
 */
export class AbstractTokenizer {
    /**
     * Constructor
     * @param options Tokenizer options
     * @protected
     */
    constructor(options) {
        this.numBuffer = new Uint8Array(8);
        /**
         * Tokenizer-stream position
         */
        this.position = 0;
        this.onClose = options?.onClose;
        if (options?.abortSignal) {
            options.abortSignal.addEventListener('abort', () => {
                this.abort();
            });
        }
    }
    /**
     * Read a token from the tokenizer-stream
     * @param token - The token to read
     * @param position - If provided, the desired position in the tokenizer-stream
     * @returns Promise with token data
     */
    async readToken(token, position = this.position) {
        const uint8Array = new Uint8Array(token.len);
        const len = await this.readBuffer(uint8Array, { position });
        if (len < token.len)
            throw new EndOfStreamError();
        return token.get(uint8Array, 0);
    }
    /**
     * Peek a token from the tokenizer-stream.
     * @param token - Token to peek from the tokenizer-stream.
     * @param position - Offset where to begin reading within the file. If position is null, data will be read from the current file position.
     * @returns Promise with token data
     */
    async peekToken(token, position = this.position) {
        const uint8Array = new Uint8Array(token.len);
        const len = await this.peekBuffer(uint8Array, { position });
        if (len < token.len)
            throw new EndOfStreamError();
        return token.get(uint8Array, 0);
    }
    /**
     * Read a numeric token from the stream
     * @param token - Numeric token
     * @returns Promise with number
     */
    async readNumber(token) {
        const len = await this.readBuffer(this.numBuffer, { length: token.len });
        if (len < token.len)
            throw new EndOfStreamError();
        return token.get(this.numBuffer, 0);
    }
    /**
     * Read a numeric token from the stream
     * @param token - Numeric token
     * @returns Promise with number
     */
    async peekNumber(token) {
        const len = await this.peekBuffer(this.numBuffer, { length: token.len });
        if (len < token.len)
            throw new EndOfStreamError();
        return token.get(this.numBuffer, 0);
    }
    /**
     * Ignore number of bytes, advances the pointer in under tokenizer-stream.
     * @param length - Number of bytes to ignore
     * @return resolves the number of bytes ignored, equals length if this available, otherwise the number of bytes available
     */
    async ignore(length) {
        if (this.fileInfo.size !== undefined) {
            const bytesLeft = this.fileInfo.size - this.position;
            if (length > bytesLeft) {
                this.position += bytesLeft;
                return bytesLeft;
            }
        }
        this.position += length;
        return length;
    }
    async close() {
        await this.abort();
        await this.onClose?.();
    }
    normalizeOptions(uint8Array, options) {
        if (!this.supportsRandomAccess() && options && options.position !== undefined && options.position < this.position) {
            throw new Error('`options.position` must be equal or greater than `tokenizer.position`');
        }
        return {
            ...{
                mayBeLess: false,
                offset: 0,
                length: uint8Array.length,
                position: this.position
            }, ...options
        };
    }
    abort() {
        return Promise.resolve(); // Ignore abort signal
    }
}