RankPL.java 文件源码

public static Program parse(String source) {
    RankPLLexer lexer = new RankPLLexer(new ANTLRInputStream(source));
    TokenStream tokens = new CommonTokenStream(lexer);
    RankPLParser parser = new RankPLParser(tokens);
    parser.setErrorHandler(new BailErrorStrategy());
    ConcreteParser classVisitor = new ConcreteParser();

    // Parse
    Program program = null;
    try {
        program = (Program) classVisitor.visit(parser.program());
    } catch (ParseCancellationException e) {
        System.out.println("Syntax error");
        lexer = new RankPLLexer(new ANTLRInputStream(source));
        tokens = new CommonTokenStream(lexer);
        parser = new RankPLParser(tokens);
        classVisitor = new ConcreteParser();
        try {
            program = (Program) classVisitor.visit(parser.program());
        } catch (Exception ex) {
            // Ignore
        }
        return null;
    }
    return program;
}