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package de.edu.hsfulda.ccip.tdd.purefunction;
import java.util.regex.Matcher; import java.util.regex.Pattern;
public class BowlingCalculator { @FunctionalInterface interface FrameScorer { int score(Matcher frameMatcher); }
private static final int INITIAL_SCORE = 0; private static final Pattern SINGLE_ROLL_PATTERN = Pattern.compile("\\d"); private static final Pattern SPARE_PATTERN = Pattern.compile("(\\d)/ ([-\\d])");
public int score(String rolls) { int score = INITIAL_SCORE; Matcher singleRollMatcher = SINGLE_ROLL_PATTERN.matcher(rolls); score = scoreFrameType(score, singleRollMatcher, matcher -> Integer.parseInt(singleRollMatcher.group()));
Matcher spareMatcher = SPARE_PATTERN.matcher(rolls); score = scoreFrameType(score, spareMatcher, matcher -> scoreSpareFrame(spareMatcher));
return score; }
private int scoreSpareFrame(Matcher spareMatcher) { int frameScore = 10 - Integer.parseInt(spareMatcher.group(1)); String nextRoll = spareMatcher.group(2); if(!"-".equalsIgnoreCase(nextRoll)) { frameScore += Integer.parseInt(spareMatcher.group(1)); } return frameScore; }
private int scoreFrameType(int score, Matcher scoreMatcher, FrameScorer frameScorer) { while (scoreMatcher.find()) { score += frameScorer.score(scoreMatcher); } return score; }
}
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