de.fluxparticle.syntax.lexer.ParserException Maven / Gradle / Ivy

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package de.fluxparticle.syntax.lexer;

import java.io.PrintWriter;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;

/**
 * Created by sreinck on 05.01.16.
 */
public class ParserException extends Exception {

    private final String input;

    private final int pos;

    public ParserException(String message, Throwable cause, String input, int pos) {
        super(message, cause);
        this.input = input;
        this.pos = pos;
    }

    public ParserException(Set expected, LexerElement actual, String input, int pos) {
        super("got (" + actual.toLexerString() + ") but expected " + extractLexerStrings(expected) + " at " + pos);
        this.input = input;
        this.pos = pos;
    }

    public void printLexerState() {
        printLexerState(new PrintWriter(System.out));
    }

    public void printLexerState(PrintWriter out) {
        out.println(input);
        for (int i = 0; i < pos; i++) {
            out.print(' ');
        }
        out.println('^');
    }

    private static List extractLexerStrings(Set expected) {
        return expected.stream().map(LexerElement::toLexerString).collect(Collectors.toList());
    }

}