import { InputStream, CommonTokenStream, Lexer } from 'antlr4';
import { PostgreSQLLexer } from '../lib/pgsql/PostgreSQLLexer';
import { PostgreSQLParser } from '../lib/pgsql/PostgreSQLParser';

import BasicParser from './common/basicParser';

export default class PLSQLParser extends BasicParser {
    public createLexer(input: string): Lexer {
        const chars = new InputStream(input.toUpperCase());
        const lexer = <unknown> new PostgreSQLLexer(chars) as Lexer;
        return lexer;
    }
    public createParserFromLexer(lexer: Lexer): any {
        const tokenStream = new CommonTokenStream(lexer);
        return new PostgreSQLParser(tokenStream);
    }
}