!752

static Map<BWImage, S> chars;
static bool debug;

!include #1000522

p {
  chars = loadGlyphSheet("#1004645");
  Map<BWImage, S> words = loadGlyphSheet("#1004649");
  chars = mapValues("unChar", chars);
  
  printStructure(values(words));
  
  double score = 0, total = 0;
  for (BWImage img : keys(words)) {
    debug = false;
    S w;
    try {
      w = recognizeWord(img);
    } catch e {
      w = exceptionToStringShort(e);
    }
    S real = words.get(img);
    print(real + " => " + w);
    ++total;
    if (eq(real, w)) {
      ++score;
      print("  ok!");
    } else {
      print("  oops...");
      debug = true;
      try {
        recognizeWord(img);
      } catch {}
    }
  }
  
  print();
  print("SCORE: " + formatDouble(score, 1) + "/" + formatDouble(total, 1));
}

static S recognizeWord(BWImage iw) {
  int w = iw.getWidth();
  new StringBuilder buf;
  xloop: for (int x = 0; x < w; x++) {
    if (debug)
      print("Best match at " + x + ": " + structure(bestMatch(iw, x)));
    for (BWImage ic : keys(chars)) {
      if (preciseMatch(ic, iw, x)) {
        buf.append(chars.get(ic));
        x += ic.getWidth()-1;
        continue xloop;
      }
    }
  }
  ret str(buf);
}

sclass Lowest<A> {
  A a;
  double score;
  
  void update(A x, double s) {
    if (a == null || s < score) {
      a = x;
      score = s;
    }
  }
  
  Pair<A, Double> getPair() {
    ret a == null ? null : pair(a, score);
  }
}

static Pair<S, Double> bestMatch(BWImage iw, int x) {
  new Lowest<S> best;
  for (BWImage ic : keys(chars)) {
    double d = diff(ic, iw.clip(x, 0, ic.getWidth(), ic.getHeight()));
    best.update(chars.get(ic), d);
  }
  ret best.getPair();
}

static bool preciseMatch(BWImage ic, BWImage iw, int x1) {
  int w = iw.getWidth(), h = iw.getHeight();
  if (ic.getHeight() != h) false;
  int x2 = x1+ic.getWidth();
  if (x2 > w) false;
  for (int x = x1; x < x2; x++)
    for (int y = 0; y < h; y++)
      if (ic.getPixel(x-x1, y) != iw.getPixel(x, y)) false;
  true;
}

static S unChar(S s) {
  try {
    int i = s.indexOf('-');
    if (i > 0) s = substring(s, 0, i);
    ret str((char) hexToInt(s));
  } catch {
    ret "[" + s + "]";
  }
}

Began life as a copy of #1004643