32 lines
1.1 KiB
Plaintext
32 lines
1.1 KiB
Plaintext
type Match = ((code: number) => boolean) | number;
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export interface BackwardScanner {
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/** Text to scan */
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text: string;
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/** Left bound till given text must be scanned */
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start: number;
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/** Current scanner position */
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pos: number;
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}
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/**
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* Creates structure for scanning given string in backward direction
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*/
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export default function backwardScanner(text: string, start?: number): BackwardScanner;
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/**
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* Check if given scanner position is at start of scanned text
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*/
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export declare function sol(scanner: BackwardScanner): boolean;
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/**
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* “Peeks” character code an current scanner location without advancing it
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*/
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export declare function peek(scanner: BackwardScanner, offset?: number): number;
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/**
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* Returns current character code and moves character location one symbol back
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*/
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export declare function previous(scanner: BackwardScanner): number | undefined;
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/**
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* Consumes current character code if it matches given `match` code or function
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*/
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export declare function consume(scanner: BackwardScanner, match: Match): boolean;
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export declare function consumeWhile(scanner: BackwardScanner, match: Match): boolean;
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export {};
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