85 lines
2.5 KiB
TypeScript
85 lines
2.5 KiB
TypeScript
import { Token } from './cst.js';
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/**
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* A YAML concrete syntax tree (CST) parser
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*
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* ```ts
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* const src: string = ...
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* for (const token of new Parser().parse(src)) {
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* // token: Token
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* }
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* ```
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*
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* To use the parser with a user-provided lexer:
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*
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* ```ts
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* function* parse(source: string, lexer: Lexer) {
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* const parser = new Parser()
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* for (const lexeme of lexer.lex(source))
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* yield* parser.next(lexeme)
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* yield* parser.end()
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* }
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*
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* const src: string = ...
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* const lexer = new Lexer()
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* for (const token of parse(src, lexer)) {
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* // token: Token
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* }
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* ```
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*/
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export declare class Parser {
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private onNewLine?;
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/** If true, space and sequence indicators count as indentation */
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private atNewLine;
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/** If true, next token is a scalar value */
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private atScalar;
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/** Current indentation level */
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private indent;
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/** Current offset since the start of parsing */
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offset: number;
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/** On the same line with a block map key */
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private onKeyLine;
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/** Top indicates the node that's currently being built */
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stack: Token[];
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/** The source of the current token, set in parse() */
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private source;
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/** The type of the current token, set in parse() */
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private type;
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/**
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* @param onNewLine - If defined, called separately with the start position of
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* each new line (in `parse()`, including the start of input).
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*/
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constructor(onNewLine?: (offset: number) => void);
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/**
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* Parse `source` as a YAML stream.
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* If `incomplete`, a part of the last line may be left as a buffer for the next call.
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*
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* Errors are not thrown, but yielded as `{ type: 'error', message }` tokens.
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*
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* @returns A generator of tokens representing each directive, document, and other structure.
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*/
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parse(source: string, incomplete?: boolean): Generator<Token, void, unknown>;
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/**
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* Advance the parser by the `source` of one lexical token.
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*/
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next(source: string): Generator<Token, void, unknown>;
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private lexer;
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/** Call at end of input to push out any remaining constructions */
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end(): Generator<Token, void, unknown>;
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private get sourceToken();
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private step;
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private peek;
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private pop;
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private stream;
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private document;
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private scalar;
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private blockScalar;
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private blockMap;
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private blockSequence;
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private flowCollection;
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private flowScalar;
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private startBlockValue;
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private atIndentedComment;
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private documentEnd;
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private lineEnd;
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}
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