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flexmark-java extension for attributes

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

import com.vladsch.flexmark.ast.util.Parsing;

import java.util.regex.Pattern;

import static com.vladsch.flexmark.ext.attributes.AttributesExtension.USE_EMPTY_IMPLICIT_AS_SPAN_DELIMITER;

class AttributeParsing {
    final Parsing myParsing;
    final Pattern ATTRIBUTES_TAG;
    final Pattern ATTRIBUTE;

    public AttributeParsing(Parsing parsing) {
        this.myParsing = parsing;
        String unquotedValue = myParsing.UNQUOTEDVALUE;//.replace("]+","}{"); // exclude braces
        this.ATTRIBUTE = Pattern.compile("\\s*([#.]" + unquotedValue + "|" + myParsing.ATTRIBUTENAME + ")\\s*(?:=\\s*(" + myParsing.ATTRIBUTEVALUE + ")?" + ")?");

        if (USE_EMPTY_IMPLICIT_AS_SPAN_DELIMITER.get(parsing.options)) {
            this.ATTRIBUTES_TAG = Pattern.compile(
                    "^\\{((?:[#.])|(?:" + "\\s*([#.]" + unquotedValue + "|" + myParsing.ATTRIBUTENAME + ")\\s*(?:=\\s*(" + myParsing.ATTRIBUTEVALUE + ")?" + ")?" + ")" +
                            "(?:" + "\\s+([#.]" + unquotedValue + "|" + myParsing.ATTRIBUTENAME + ")\\s*(?:=\\s*(" + myParsing.ATTRIBUTEVALUE + ")?" + ")?" + ")*" + "\\s*)\\}"
            );
        } else {
            this.ATTRIBUTES_TAG = Pattern.compile(
                    "^\\{((?:" + "\\s*([#.]" + unquotedValue + "|" + myParsing.ATTRIBUTENAME + ")\\s*(?:=\\s*(" + myParsing.ATTRIBUTEVALUE + ")?" + ")?" + ")" +
                            "(?:" + "\\s+([#.]" + unquotedValue + "|" + myParsing.ATTRIBUTENAME + ")\\s*(?:=\\s*(" + myParsing.ATTRIBUTEVALUE + ")?" + ")?" + ")*" + "\\s*)\\}"
            );
        }
    }
}