679 lines
20 KiB
TypeScript
679 lines
20 KiB
TypeScript
import { charset, escapedSequences } from './utils/utf-8.ts';
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import {
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StringBuilder,
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NonBufferedString,
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BufferedString,
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} from './utils/bufferedString.ts';
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import { TokenType } from './utils/constants.ts';
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import { JsonPrimitive } from './utils/types.ts';
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const {
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LEFT_BRACE,
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RIGHT_BRACE,
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LEFT_BRACKET,
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RIGHT_BRACKET,
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COLON,
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COMMA,
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TRUE,
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FALSE,
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NULL,
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STRING,
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NUMBER,
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} = TokenType;
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// Tokenizer States
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enum TokenizerStates {
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START,
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ENDED,
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ERROR,
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TRUE1,
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TRUE2,
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TRUE3,
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FALSE1,
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FALSE2,
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FALSE3,
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FALSE4,
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NULL1,
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NULL2,
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NULL3,
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STRING_DEFAULT,
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STRING_AFTER_BACKSLASH,
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STRING_UNICODE_DIGIT_1,
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STRING_UNICODE_DIGIT_2,
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STRING_UNICODE_DIGIT_3,
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STRING_UNICODE_DIGIT_4,
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STRING_INCOMPLETE_CHAR,
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NUMBER_AFTER_INITIAL_MINUS,
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NUMBER_AFTER_INITIAL_ZERO,
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NUMBER_AFTER_INITIAL_NON_ZERO,
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NUMBER_AFTER_FULL_STOP,
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NUMBER_AFTER_DECIMAL,
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NUMBER_AFTER_E,
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NUMBER_AFTER_E_AND_SIGN,
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NUMBER_AFTER_E_AND_DIGIT,
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SEPARATOR,
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}
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export interface TokenizerOptions {
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stringBufferSize?: number;
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numberBufferSize?: number;
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separator?: string;
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}
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const defaultOpts: TokenizerOptions = {
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stringBufferSize: 0,
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numberBufferSize: 0,
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separator: undefined,
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};
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export class TokenizerError extends Error {
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constructor(message: string) {
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super(message);
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// Typescript is broken. This is a workaround
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Object.setPrototypeOf(this, TokenizerError.prototype);
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}
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}
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export default class Tokenizer {
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private state = TokenizerStates.START;
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private separator?: string;
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private separatorBytes?: Uint8Array;
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private separatorIndex = 0;
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private bufferedString: StringBuilder;
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private bufferedNumber: StringBuilder;
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private unicode: string | undefined = undefined; // unicode escapes
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private highSurrogate: number | undefined = undefined;
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private bytes_remaining = 0; // number of bytes remaining in multi byte utf8 char to read after split boundary
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private bytes_in_sequence = 0; // bytes in multi byte utf8 char to read
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private char_split_buffer = new Uint8Array(4); // for rebuilding chars split before boundary is reached
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private encoder = new TextEncoder();
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private offset = -1;
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constructor(opts?: TokenizerOptions) {
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opts = { ...defaultOpts, ...opts };
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this.bufferedString =
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opts.stringBufferSize && opts.stringBufferSize > 4
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? new BufferedString(opts.stringBufferSize)
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: new NonBufferedString();
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this.bufferedNumber =
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opts.numberBufferSize && opts.numberBufferSize > 0
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? new BufferedString(opts.numberBufferSize)
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: new NonBufferedString();
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this.separator = opts.separator;
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this.separatorBytes = opts.separator
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? this.encoder.encode(opts.separator)
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: undefined;
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}
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public get isEnded(): boolean {
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return this.state === TokenizerStates.ENDED;
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}
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public write(input: Iterable<number> | string): void {
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let buffer: Uint8Array;
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if (input instanceof Uint8Array) {
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buffer = input;
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} else if (typeof input === "string") {
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buffer = this.encoder.encode(input);
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} else if (
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(typeof input === "object" && "buffer" in input) ||
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Array.isArray(input)
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) {
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buffer = Uint8Array.from(input);
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} else {
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this.error(
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new TypeError(
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"Unexpected type. The `write` function only accepts Arrays, TypedArrays and Strings."
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)
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);
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return;
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}
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for (let i = 0; i < buffer.length; i += 1) {
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const n = buffer[i]; // get current byte from buffer
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switch (this.state) {
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case TokenizerStates.START:
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this.offset += 1;
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if (this.separatorBytes && n === this.separatorBytes[0]) {
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if (this.separatorBytes.length === 1) {
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this.state = TokenizerStates.START;
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this.onToken(
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TokenType.SEPARATOR,
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this.separator as string,
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this.offset + this.separatorBytes.length - 1
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);
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continue;
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}
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this.state = TokenizerStates.SEPARATOR;
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continue;
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}
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if (
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n === charset.SPACE ||
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n === charset.NEWLINE ||
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n === charset.CARRIAGE_RETURN ||
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n === charset.TAB
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) {
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// whitespace
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continue;
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}
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if (n === charset.LEFT_CURLY_BRACKET) {
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this.onToken(LEFT_BRACE, "{", this.offset);
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continue;
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}
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if (n === charset.RIGHT_CURLY_BRACKET) {
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this.onToken(RIGHT_BRACE, "}", this.offset);
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continue;
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}
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if (n === charset.LEFT_SQUARE_BRACKET) {
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this.onToken(LEFT_BRACKET, "[", this.offset);
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continue;
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}
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if (n === charset.RIGHT_SQUARE_BRACKET) {
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this.onToken(RIGHT_BRACKET, "]", this.offset);
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continue;
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}
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if (n === charset.COLON) {
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this.onToken(COLON, ":", this.offset);
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continue;
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}
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if (n === charset.COMMA) {
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this.onToken(COMMA, ",", this.offset);
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continue;
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}
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if (n === charset.LATIN_SMALL_LETTER_T) {
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this.state = TokenizerStates.TRUE1;
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continue;
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}
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if (n === charset.LATIN_SMALL_LETTER_F) {
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this.state = TokenizerStates.FALSE1;
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continue;
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}
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if (n === charset.LATIN_SMALL_LETTER_N) {
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this.state = TokenizerStates.NULL1;
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continue;
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}
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if (n === charset.QUOTATION_MARK) {
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this.bufferedString.reset();
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this.state = TokenizerStates.STRING_DEFAULT;
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continue;
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}
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if (n >= charset.DIGIT_ONE && n <= charset.DIGIT_NINE) {
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this.bufferedNumber.reset();
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this.bufferedNumber.appendChar(n);
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this.state = TokenizerStates.NUMBER_AFTER_INITIAL_NON_ZERO;
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continue;
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}
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if (n === charset.DIGIT_ZERO) {
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this.bufferedNumber.reset();
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this.bufferedNumber.appendChar(n);
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this.state = TokenizerStates.NUMBER_AFTER_INITIAL_ZERO;
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continue;
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}
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if (n === charset.HYPHEN_MINUS) {
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this.bufferedNumber.reset();
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this.bufferedNumber.appendChar(n);
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this.state = TokenizerStates.NUMBER_AFTER_INITIAL_MINUS;
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continue;
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}
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break;
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// STRING
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case TokenizerStates.STRING_DEFAULT:
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if (n === charset.QUOTATION_MARK) {
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const string = this.bufferedString.toString();
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this.state = TokenizerStates.START;
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this.onToken(STRING, string, this.offset);
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this.offset += this.bufferedString.byteLength + 1;
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continue;
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}
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if (n === charset.REVERSE_SOLIDUS) {
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this.state = TokenizerStates.STRING_AFTER_BACKSLASH;
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continue;
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}
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if (n >= 128) {
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// Parse multi byte (>=128) chars one at a time
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if (n >= 194 && n <= 223) {
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this.bytes_in_sequence = 2;
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} else if (n <= 239) {
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this.bytes_in_sequence = 3;
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} else {
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this.bytes_in_sequence = 4;
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}
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if (this.bytes_in_sequence <= buffer.length - i) {
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// if bytes needed to complete char fall outside buffer length, we have a boundary split
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this.bufferedString.appendBuf(
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buffer,
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i,
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i + this.bytes_in_sequence
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);
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i += this.bytes_in_sequence - 1;
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continue;
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}
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this.bytes_remaining = i + this.bytes_in_sequence - buffer.length;
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this.char_split_buffer.set(buffer.subarray(i));
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i = buffer.length - 1;
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this.state = TokenizerStates.STRING_INCOMPLETE_CHAR;
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continue;
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}
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if (n >= charset.SPACE) {
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this.bufferedString.appendChar(n);
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continue;
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}
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break;
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case TokenizerStates.STRING_INCOMPLETE_CHAR:
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// check for carry over of a multi byte char split between data chunks
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// & fill temp buffer it with start of this data chunk up to the boundary limit set in the last iteration
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this.char_split_buffer.set(
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buffer.subarray(i, i + this.bytes_remaining),
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this.bytes_in_sequence - this.bytes_remaining
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);
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this.bufferedString.appendBuf(
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this.char_split_buffer,
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0,
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this.bytes_in_sequence
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);
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i = this.bytes_remaining - 1;
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this.state = TokenizerStates.STRING_DEFAULT;
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continue;
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case TokenizerStates.STRING_AFTER_BACKSLASH:
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const controlChar = escapedSequences[n];
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if (controlChar) {
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this.bufferedString.appendChar(controlChar);
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this.state = TokenizerStates.STRING_DEFAULT;
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continue;
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}
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if (n === charset.LATIN_SMALL_LETTER_U) {
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this.unicode = "";
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this.state = TokenizerStates.STRING_UNICODE_DIGIT_1;
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continue;
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}
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break;
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case TokenizerStates.STRING_UNICODE_DIGIT_1:
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case TokenizerStates.STRING_UNICODE_DIGIT_2:
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case TokenizerStates.STRING_UNICODE_DIGIT_3:
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if (
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(n >= charset.DIGIT_ZERO && n <= charset.DIGIT_NINE) ||
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(n >= charset.LATIN_CAPITAL_LETTER_A &&
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n <= charset.LATIN_CAPITAL_LETTER_F) ||
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(n >= charset.LATIN_SMALL_LETTER_A &&
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n <= charset.LATIN_SMALL_LETTER_F)
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) {
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this.unicode += String.fromCharCode(n);
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this.state += 1;
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continue;
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}
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break;
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case TokenizerStates.STRING_UNICODE_DIGIT_4:
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if (
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(n >= charset.DIGIT_ZERO && n <= charset.DIGIT_NINE) ||
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(n >= charset.LATIN_CAPITAL_LETTER_A &&
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n <= charset.LATIN_CAPITAL_LETTER_F) ||
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(n >= charset.LATIN_SMALL_LETTER_A &&
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n <= charset.LATIN_SMALL_LETTER_F)
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) {
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const intVal = parseInt(this.unicode + String.fromCharCode(n), 16);
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if (this.highSurrogate === undefined) {
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if (intVal >= 0xd800 && intVal <= 0xdbff) {
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//<55296,56319> - highSurrogate
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this.highSurrogate = intVal;
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} else {
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this.bufferedString.appendBuf(
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this.encoder.encode(String.fromCharCode(intVal))
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);
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}
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} else {
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if (intVal >= 0xdc00 && intVal <= 0xdfff) {
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//<56320,57343> - lowSurrogate
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this.bufferedString.appendBuf(
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this.encoder.encode(
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String.fromCharCode(this.highSurrogate, intVal)
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)
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);
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} else {
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this.bufferedString.appendBuf(
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this.encoder.encode(String.fromCharCode(this.highSurrogate))
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);
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}
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this.highSurrogate = undefined;
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}
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this.state = TokenizerStates.STRING_DEFAULT;
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continue;
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}
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// Number
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case TokenizerStates.NUMBER_AFTER_INITIAL_MINUS:
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if (n === charset.DIGIT_ZERO) {
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this.bufferedNumber.appendChar(n);
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this.state = TokenizerStates.NUMBER_AFTER_INITIAL_ZERO;
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continue;
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}
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if (n >= charset.DIGIT_ONE && n <= charset.DIGIT_NINE) {
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this.bufferedNumber.appendChar(n);
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this.state = TokenizerStates.NUMBER_AFTER_INITIAL_NON_ZERO;
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continue;
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}
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break;
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case TokenizerStates.NUMBER_AFTER_INITIAL_ZERO:
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if (n === charset.FULL_STOP) {
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this.bufferedNumber.appendChar(n);
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this.state = TokenizerStates.NUMBER_AFTER_FULL_STOP;
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continue;
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}
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if (
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n === charset.LATIN_SMALL_LETTER_E ||
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n === charset.LATIN_CAPITAL_LETTER_E
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) {
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this.bufferedNumber.appendChar(n);
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this.state = TokenizerStates.NUMBER_AFTER_E;
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continue;
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}
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i -= 1;
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this.state = TokenizerStates.START;
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this.emitNumber();
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continue;
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case TokenizerStates.NUMBER_AFTER_INITIAL_NON_ZERO:
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if (n >= charset.DIGIT_ZERO && n <= charset.DIGIT_NINE) {
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this.bufferedNumber.appendChar(n);
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continue;
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}
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if (n === charset.FULL_STOP) {
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this.bufferedNumber.appendChar(n);
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this.state = TokenizerStates.NUMBER_AFTER_FULL_STOP;
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continue;
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}
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if (
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n === charset.LATIN_SMALL_LETTER_E ||
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n === charset.LATIN_CAPITAL_LETTER_E
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) {
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this.bufferedNumber.appendChar(n);
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this.state = TokenizerStates.NUMBER_AFTER_E;
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continue;
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}
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i -= 1;
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this.state = TokenizerStates.START;
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this.emitNumber();
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continue;
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case TokenizerStates.NUMBER_AFTER_FULL_STOP:
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if (n >= charset.DIGIT_ZERO && n <= charset.DIGIT_NINE) {
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this.bufferedNumber.appendChar(n);
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this.state = TokenizerStates.NUMBER_AFTER_DECIMAL;
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continue;
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}
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break;
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case TokenizerStates.NUMBER_AFTER_DECIMAL:
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if (n >= charset.DIGIT_ZERO && n <= charset.DIGIT_NINE) {
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this.bufferedNumber.appendChar(n);
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continue;
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}
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if (
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n === charset.LATIN_SMALL_LETTER_E ||
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n === charset.LATIN_CAPITAL_LETTER_E
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) {
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this.bufferedNumber.appendChar(n);
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this.state = TokenizerStates.NUMBER_AFTER_E;
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continue;
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}
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i -= 1;
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this.state = TokenizerStates.START;
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this.emitNumber();
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continue;
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case TokenizerStates.NUMBER_AFTER_E:
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if (n === charset.PLUS_SIGN || n === charset.HYPHEN_MINUS) {
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this.bufferedNumber.appendChar(n);
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this.state = TokenizerStates.NUMBER_AFTER_E_AND_SIGN;
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continue;
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}
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// Allow cascading
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case TokenizerStates.NUMBER_AFTER_E_AND_SIGN:
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if (n >= charset.DIGIT_ZERO && n <= charset.DIGIT_NINE) {
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this.bufferedNumber.appendChar(n);
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this.state = TokenizerStates.NUMBER_AFTER_E_AND_DIGIT;
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continue;
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}
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break;
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case TokenizerStates.NUMBER_AFTER_E_AND_DIGIT:
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if (n >= charset.DIGIT_ZERO && n <= charset.DIGIT_NINE) {
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this.bufferedNumber.appendChar(n);
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continue;
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}
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i -= 1;
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this.state = TokenizerStates.START;
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this.emitNumber();
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continue;
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// TRUE
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case TokenizerStates.TRUE1:
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if (n === charset.LATIN_SMALL_LETTER_R) {
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this.state = TokenizerStates.TRUE2;
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continue;
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}
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break;
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case TokenizerStates.TRUE2:
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if (n === charset.LATIN_SMALL_LETTER_U) {
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this.state = TokenizerStates.TRUE3;
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continue;
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}
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break;
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case TokenizerStates.TRUE3:
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if (n === charset.LATIN_SMALL_LETTER_E) {
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this.state = TokenizerStates.START;
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this.onToken(TRUE, true, this.offset);
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this.offset += 3;
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continue;
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}
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break;
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// FALSE
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case TokenizerStates.FALSE1:
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if (n === charset.LATIN_SMALL_LETTER_A) {
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this.state = TokenizerStates.FALSE2;
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continue;
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}
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break;
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case TokenizerStates.FALSE2:
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if (n === charset.LATIN_SMALL_LETTER_L) {
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this.state = TokenizerStates.FALSE3;
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continue;
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}
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break;
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case TokenizerStates.FALSE3:
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if (n === charset.LATIN_SMALL_LETTER_S) {
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this.state = TokenizerStates.FALSE4;
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continue;
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}
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break;
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case TokenizerStates.FALSE4:
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if (n === charset.LATIN_SMALL_LETTER_E) {
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this.state = TokenizerStates.START;
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this.onToken(FALSE, false, this.offset);
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this.offset += 4;
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continue;
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}
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break;
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// NULL
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case TokenizerStates.NULL1:
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if (n === charset.LATIN_SMALL_LETTER_U) {
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this.state = TokenizerStates.NULL2;
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continue;
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}
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break;
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case TokenizerStates.NULL2:
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if (n === charset.LATIN_SMALL_LETTER_L) {
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this.state = TokenizerStates.NULL3;
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continue;
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}
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break;
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case TokenizerStates.NULL3:
|
|
if (n === charset.LATIN_SMALL_LETTER_L) {
|
|
this.state = TokenizerStates.START;
|
|
this.onToken(NULL, null, this.offset);
|
|
this.offset += 3;
|
|
continue;
|
|
}
|
|
break;
|
|
case TokenizerStates.SEPARATOR:
|
|
this.separatorIndex += 1;
|
|
if (
|
|
!this.separatorBytes ||
|
|
n !== this.separatorBytes[this.separatorIndex]
|
|
) {
|
|
break;
|
|
}
|
|
if (this.separatorIndex === this.separatorBytes.length - 1) {
|
|
this.state = TokenizerStates.START;
|
|
this.onToken(
|
|
TokenType.SEPARATOR,
|
|
this.separator as string,
|
|
this.offset + this.separatorIndex
|
|
);
|
|
this.separatorIndex = 0;
|
|
}
|
|
continue;
|
|
case TokenizerStates.ENDED:
|
|
if (
|
|
n === charset.SPACE ||
|
|
n === charset.NEWLINE ||
|
|
n === charset.CARRIAGE_RETURN ||
|
|
n === charset.TAB
|
|
) {
|
|
// whitespace
|
|
continue;
|
|
}
|
|
}
|
|
|
|
this.error(
|
|
new TokenizerError(
|
|
`Unexpected "${String.fromCharCode(n)}" at position "${i}" in state ${
|
|
TokenizerStates[this.state]
|
|
}`
|
|
)
|
|
);
|
|
return;
|
|
}
|
|
}
|
|
|
|
private emitNumber(): void {
|
|
this.onToken(
|
|
NUMBER,
|
|
this.parseNumber(this.bufferedNumber.toString()),
|
|
this.offset
|
|
);
|
|
this.offset += this.bufferedNumber.byteLength - 1;
|
|
}
|
|
|
|
protected parseNumber(numberStr: string): number {
|
|
return Number(numberStr);
|
|
}
|
|
|
|
public error(err: Error): void {
|
|
if (this.state !== TokenizerStates.ENDED) {
|
|
this.state = TokenizerStates.ERROR;
|
|
}
|
|
|
|
this.onError(err);
|
|
}
|
|
|
|
public end(): void {
|
|
switch (this.state) {
|
|
case TokenizerStates.NUMBER_AFTER_INITIAL_ZERO:
|
|
case TokenizerStates.NUMBER_AFTER_INITIAL_NON_ZERO:
|
|
case TokenizerStates.NUMBER_AFTER_DECIMAL:
|
|
case TokenizerStates.NUMBER_AFTER_E_AND_DIGIT:
|
|
this.state = TokenizerStates.ENDED;
|
|
this.emitNumber();
|
|
this.onEnd();
|
|
break;
|
|
case TokenizerStates.START:
|
|
case TokenizerStates.ERROR:
|
|
case TokenizerStates.SEPARATOR:
|
|
this.state = TokenizerStates.ENDED;
|
|
this.onEnd();
|
|
break;
|
|
default:
|
|
this.error(
|
|
new TokenizerError(
|
|
`Tokenizer ended in the middle of a token (state: ${
|
|
TokenizerStates[this.state]
|
|
}). Either not all the data was received or the data was invalid.`
|
|
)
|
|
);
|
|
}
|
|
}
|
|
|
|
public onToken(token: TokenType.LEFT_BRACE, value: "{", offset: number): void;
|
|
public onToken(
|
|
token: TokenType.RIGHT_BRACE,
|
|
value: "}",
|
|
offset: number
|
|
): void;
|
|
public onToken(
|
|
token: TokenType.LEFT_BRACKET,
|
|
value: "[",
|
|
offset: number
|
|
): void;
|
|
public onToken(
|
|
token: TokenType.RIGHT_BRACKET,
|
|
value: "]",
|
|
offset: number
|
|
): void;
|
|
public onToken(token: TokenType.COLON, value: ":", offset: number): void;
|
|
public onToken(token: TokenType.COMMA, value: ",", offset: number): void;
|
|
public onToken(token: TokenType.TRUE, value: true, offset: number): void;
|
|
public onToken(token: TokenType.FALSE, value: false, offset: number): void;
|
|
public onToken(token: TokenType.NULL, value: null, offset: number): void;
|
|
public onToken(token: TokenType.STRING, value: string, offset: number): void;
|
|
public onToken(token: TokenType.NUMBER, value: number, offset: number): void;
|
|
public onToken(
|
|
token: TokenType.SEPARATOR,
|
|
value: string,
|
|
offset: number
|
|
): void;
|
|
// eslint-disable-next-line @typescript-eslint/no-unused-vars
|
|
public onToken(token: TokenType, value: JsonPrimitive, offset: number): void {
|
|
// Override me
|
|
throw new TokenizerError(
|
|
'Can\'t emit tokens before the "onToken" callback has been set up.'
|
|
);
|
|
}
|
|
|
|
public onError(err: Error): void {
|
|
// Override me
|
|
throw err;
|
|
}
|
|
|
|
public onEnd(): void {
|
|
// Override me
|
|
}
|
|
}
|