sql-formatter/dist/esm/parser/createParser.js

Format whitespace in a SQL query to make it more readable

import nearley from 'nearley';
import { disambiguateTokens } from '../lexer/disambiguateTokens.js';
import grammar from './grammar.js';
import LexerAdapter from './LexerAdapter.js';
import { createEofToken } from '../lexer/token.js';
const { Parser: NearleyParser, Grammar } = nearley;
/**
 * Creates a parser object which wraps the setup of Nearley parser
 */
export function createParser(tokenizer) {
    let paramTypesOverrides = {};
    const lexer = new LexerAdapter(chunk => [
        ...disambiguateTokens(tokenizer.tokenize(chunk, paramTypesOverrides)),
        createEofToken(chunk.length),
    ]);
    const parser = new NearleyParser(Grammar.fromCompiled(grammar), { lexer });
    return {
        parse: (sql, paramTypes) => {
            // share paramTypesOverrides with Tokenizer
            paramTypesOverrides = paramTypes;
            const { results } = parser.feed(sql);
            if (results.length === 1) {
                return results[0];
            }
            else if (results.length === 0) {
                // Ideally we would report a line number where the parser failed,
                // but I haven't found a way to get this info from Nearley :(
                throw new Error('Parse error: Invalid SQL');
            }
            else {
                throw new Error(`Parse error: Ambiguous grammar\n${JSON.stringify(results, undefined, 2)}`);
            }
        },
    };
}
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