@opra/common/esm/filter/parse.js

Opra common package

import { CharStream, CommonTokenStream } from '@browsery/antlr4';
import OpraFilterLexer from './antlr/OpraFilterLexer.js';
import OpraFilterParser from './antlr/OpraFilterParser.js';
import { SyntaxError } from './errors.js';
import { FilterTreeVisitor } from './filter-tree-visitor.js';
import { OpraErrorListener } from './opra-error-listener.js';
export function parse(text, visitor) {
    const chars = new CharStream(text);
    const lexer = new OpraFilterLexer(chars);
    const tokenStream = new CommonTokenStream(lexer);
    const parser = new OpraFilterParser(tokenStream);
    parser.buildParseTrees = true;
    const errors = [];
    const errorListener = new OpraErrorListener(errors);
    lexer.removeErrorListeners();
    lexer.addErrorListener(errorListener);
    parser.removeErrorListeners();
    parser.addErrorListener(errorListener);
    const tree = parser.root();
    if (errors.length) {
        const errMsgs = [];
        for (const err of errors) {
            errMsgs.push(err.message +
                (text.includes('\n')
                    ? ' at line: ' + err.line + ' column: ' + err.column
                    : ' at column: ' + err.column));
        }
        const e = new SyntaxError(errMsgs.join('\n'));
        e.errors = errors;
        throw e;
    }
    visitor = visitor || new FilterTreeVisitor();
    return visitor.visit(tree);
}