package bjc.utils.parserutils;

import static bjc.utils.PropertyDB.applyFormat;
import static bjc.utils.PropertyDB.getRegex;

import java.util.regex.Pattern;

/*
 * Checks if a string would pass Double.parseDouble.
 *
 * Uses a regex from the javadoc for Double.valueOf()
 */
class DoubleMatcher {
	/*
	 * Unit pieces.
	 */
	private static final String rDecDigits = getRegex("fpDigits");
	private static final String rHexDigits = getRegex("fpHexDigits");
	private static final String rExponent = applyFormat("fpExponent", getRegex("fpExponent"), rDecDigits);

	/*
	 * Decimal floating point numbers.
	 */
	private static final String rSimpleDec = applyFormat("fpDecimalDecimal", rDecDigits, rExponent);
	private static final String rSimpleIntDec = applyFormat("fpDecimalInteger", rDecDigits, rExponent);

	/*
	 * Hex floating point numbers.
	 */
	private static final String rHexInt = applyFormat("fpHexInteger", rHexDigits);
	private static final String rHexDec = applyFormat("fpHexDecimal", rHexDigits);
	private static final String rHexLead = applyFormat("fpHexLeader", rHexInt, rHexDec);
	private static final String rHexString = applyFormat("fpHexString", rHexLead, rDecDigits);

	/*
	 * Floating point components.
	 */
	private static final String rFPLeader = getRegex("fpLeader");
	private static final String rFPNum = applyFormat("fpNumber", rSimpleIntDec, rSimpleDec, rHexString);

	/*
	 * Full double.
	 */
	private static final String rDouble = applyFormat("fpDouble", rFPLeader, rFPNum);
	public static final Pattern doubleLiteral = Pattern.compile("\\A" + rDouble + "\\Z");
}