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flexmark-java extension for ins

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package com.vladsch.flexmark.ext.ins.internal;

import com.vladsch.flexmark.ext.ins.Ins;
import com.vladsch.flexmark.parser.InlineParser;
import com.vladsch.flexmark.parser.core.delimiter.Delimiter;
import com.vladsch.flexmark.parser.delimiter.DelimiterProcessor;
import com.vladsch.flexmark.parser.delimiter.DelimiterRun;
import com.vladsch.flexmark.util.ast.Node;
import com.vladsch.flexmark.util.sequence.BasedSequence;

public class InsDelimiterProcessor implements DelimiterProcessor {

    @Override
    public char getOpeningCharacter() {
        return '+';
    }

    @Override
    public char getClosingCharacter() {
        return '+';
    }

    @Override
    public int getMinLength() {
        return 2;
    }

    @Override
    public boolean canBeOpener(String before, String after, boolean leftFlanking, boolean rightFlanking, boolean beforeIsPunctuation, boolean afterIsPunctuation, boolean beforeIsWhitespace, boolean afterIsWhiteSpace) {
        return leftFlanking;
    }

    @Override
    public boolean canBeCloser(String before, String after, boolean leftFlanking, boolean rightFlanking, boolean beforeIsPunctuation, boolean afterIsPunctuation, boolean beforeIsWhitespace, boolean afterIsWhiteSpace) {
        return rightFlanking;
    }

    @Override
    public boolean skipNonOpenerCloser() {
        return false;
    }

    @Override
    public int getDelimiterUse(DelimiterRun opener, DelimiterRun closer) {
        if (opener.length() >= 2 && closer.length() >= 2) {
            return 2;
        } else {
            return 0;
        }
    }

    @Override
    public Node unmatchedDelimiterNode(InlineParser inlineParser, DelimiterRun delimiter) {
        return null;
    }

    @Override
    public void process(Delimiter opener, Delimiter closer, int delimitersUsed) {
        // Normal case, wrap nodes between delimiters in strikethrough.
        Ins ins = new Ins(opener.getTailChars(delimitersUsed), BasedSequence.NULL, closer.getLeadChars(delimitersUsed));
        opener.moveNodesBetweenDelimitersTo(ins, closer);
    }
}