72 lines
2.4 KiB
Plaintext
72 lines
2.4 KiB
Plaintext
export * from './utils.js';
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type MatchFn = (ch: number) => boolean;
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/**
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* A streaming, character code-based string reader
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*/
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export default class Scanner {
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/** Current string */
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string: string;
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/** Current scanner position */
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pos: number;
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/** Lower range limit where string reader is available */
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start: number;
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/** Upper range limit where string reader is available */
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end: number;
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constructor(str: string, start?: number, end?: number);
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/**
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* Returns true only if the stream is at the end of the file.
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*/
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eof(): boolean;
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/**
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* Creates a new stream instance which is limited to given `start` and `end`
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* range. E.g. its `eof()` method will look at `end` property, not actual
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* stream end
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*/
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limit(start?: number, end?: number): Scanner;
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/**
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* Returns the next character code in the stream without advancing it.
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* Will return NaN at the end of the file.
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*/
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peek(): number;
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/**
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* Returns the next character in the stream and advances it.
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* Also returns <code>undefined</code> when no more characters are available.
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*/
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next(): number | undefined;
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/**
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* `match` can be a character code or a function that takes a character code
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* and returns a boolean. If the next character in the stream 'matches'
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* the given argument, it is consumed and returned.
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* Otherwise, `false` is returned.
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*/
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eat(match: number | MatchFn): boolean;
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/**
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* Repeatedly calls <code>eat</code> with the given argument, until it
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* fails. Returns <code>true</code> if any characters were eaten.
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*/
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eatWhile(match: number | MatchFn): boolean;
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/**
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* Backs up the stream n characters. Backing it up further than the
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* start of the current token will cause things to break, so be careful.
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*/
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backUp(n: number): void;
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/**
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* Get the string between the start of the current token and the
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* current stream position.
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*/
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current(): string;
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/**
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* Returns substring for given range
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*/
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substring(start: number, end?: number): string;
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/**
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* Creates error object with current stream state
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*/
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error(message: string, pos?: number): ScannerError;
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}
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export declare class ScannerError extends Error {
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pos: number;
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string: string;
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constructor(message: string, pos: number, str: string);
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}
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