jaskell.parsec.common.NoneOf Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of jaskell-java8 Show documentation

This is a utils library for java 8 project. It include parsec combinators and sql generators library.

There is a newer version: 2.9.2

package jaskell.parsec.common;

import static java.util.stream.Collectors.joining;

import jaskell.parsec.ParsecException;

import java.io.EOFException;
import java.util.Set;

/**
 * Created by Mars Liu on 2016-01-03.
 * NoneOf 即 none of ,它期待得到的信息项与给定的任何项都不匹配,否则返回错误.
 */
public class NoneOf implements
    Parsec {
    private final Set items;

    @Override
    public E parse(State s) throws EOFException, ParsecException {
        E re = s.next();
        if(items.contains(re)) {
            String message = String.format("expect a item none of [%s] but got %s",
                    this.items.stream().map(E::toString).collect(joining()), re);
            throw s.trap(message);
        }
        return re;
    }

    public NoneOf(Set items){
        this.items = items;
    }
}