Examples with Parser de.be4.eventb.core.parser.parser.Parser used on opensource projects

Example 81 with Parser

use of de.be4.eventb.core.parser.parser.Parser in project probparsers by bendisposto.

the class BParser method eparse.

public Start eparse(String input, IDefinitions context) throws BCompoundException, LexerException, IOException {
    final Reader reader = new StringReader(input);
    Start ast = null;
    List<String> ids = new ArrayList<>();
    final DefinitionTypes defTypes = new DefinitionTypes();
    defTypes.addAll(context.getTypes());
    BLexer bLexer = new BLexer(new PushbackReader(reader, BLexer.PUSHBACK_BUFFER_SIZE), defTypes);
    bLexer.setParseOptions(parseOptions);
    Token t;
    do {
        t = bLexer.next();
        if (t instanceof TIdentifierLiteral) {
            if (!ids.contains(t.getText())) {
                ids.add(t.getText());
            }
        }
    } while (!(t instanceof EOF));
    Parser p = new Parser(new EBLexer(input, BigInteger.ZERO, ids, defTypes));
    boolean ok;
    try {
        ast = p.parse();
        ok = true;
    } catch (Exception e) {
        handleException(e);
        ok = false;
    }
    BigInteger b = new BigInteger("2");
    b = b.pow(ids.size());
    b = b.subtract(BigInteger.ONE);
    while (!ok && b.compareTo(BigInteger.ZERO) > 0) {
        p = new Parser(new EBLexer(input, b, ids, defTypes));
        try {
            ast = p.parse();
            ok = true;
        } catch (ParserException e) {
            b = b.subtract(BigInteger.ONE);
            handleException(e);
        }
    }
    return ast;
}