import javax.imageio.*;
import java.awt.image.*;
import java.awt.event.*;
import java.awt.*;
import java.security.NoSuchAlgorithmException;
import java.security.MessageDigest;
import java.lang.management.*;
import java.lang.ref.*;
import java.lang.reflect.*;
import java.net.*;
import java.io.*;
import javax.swing.table.*;
import javax.swing.text.*;
import javax.swing.event.*;
import javax.swing.*;
import java.util.concurrent.atomic.*;
import java.util.concurrent.*;
import java.util.regex.*;
import java.util.List;
import java.util.zip.*;
import java.util.*;


public class main {
  static List<String> rules = new ArrayList<String>();
  static List<String> statements = new ArrayList<String>();
  
  public static void main(String[] args) throws Exception {
    rules.add("\"$1 is the singular of $2.\" <=> \"$2 is the plural of $1.\"");
    statements.add("house is the singular of houses.");
    process();
    print(fromLines(statements));

    ask("how many plurals does \"house\" have?");
    ask("what are the plurals of \"house\"?");
  }
  
  static void ask(String q) {
    print("? " + q);
    
    Map<String, String> map = new TreeMap<String, String>();
    if (match4("how many plurals does $1 have?", q, map))
      print(getPlurals(map.get("$1")).size());
    else if (match4("what are the plurals of $1?", q, map))
      print(structure(getPlurals(map.get("$1"))));
    else
      print("dunno.");
  }
  
  static List<String> getPlurals(String x) {
    String c = "$2 is the plural of " + x;
    print("[" + c + "]");
    MultiMap<String, String> matches = matchAll(c);
    return matches.get("$2");
  }

  // result of matchStatements ordered by variable
  static MultiMap<String, String> matchAll(String pat) {
    MultiMap<String, String> map = new MultiMap<String, String>();
    List<Map<String, String>> l = matchStatements(pat);
    print("[" + l.size() + " matches for " + quote(pat) + "]");
    for (Map<String, String> m : l) {
      for (Map.Entry<String, String> e : m.entrySet())
        map.put(e.getKey(), e.getValue());
    }
    return map;
  }
  
  static void process() {
    for (String rule : rules) {
      Matches m = new Matches();
      if (match3("* <=> *", rule, m)) {
        String l = m.unq(0), r = m.unq(1);
        for (Map<String, String> map : matchStatements(l))
          addStatement(convert(r, map));
      }
    }
  }
  
  static List<Map<String, String>> matchStatements(String pat) {
    List<Map<String, String>> l = new ArrayList<Map<String, String>>();
    for (String s : statements) {
      Map<String, String> m = match4(pat, s);
      if (m != null) l.add(m);
    }
    return l;
  }
  
  static Map<String, String> match4(String pat, String s) {
    Map<String, String> m = new TreeMap<String, String>();
    return match4(pat, s, m) ? m : null;
  }
  
  static boolean match4(String pat, String s, Map<String, String> m) {
    List<String> tok1 = parse3(pat), tok2 = parse3(s);
    if (tok1.size() != tok2.size()) return false;
    m.clear();
    for (int i = 1; i < tok1.size(); i += 2) {
      String t1 = tok1.get(i), t2 = tok2.get(i);
      if (isVar(t1))
        m.put(t1, t2);
      else if (!tokEq(t1, t2))
        return false;
    }
    return true;
  }
  
  static boolean tokEq(String a, String b) {
    a = unquote(a);
    b = unquote(b);
    return a.equalsIgnoreCase(b);
  }
  
  static boolean isVar(String s) {
    return s.startsWith("$") && s.length() > 1;
  }
  
  static String convert(String r, Map<String, String> matches) {
    List<String> tok = javaTokPlusPeriod(r);
    for (int i = 1; i < tok.size(); i += 2) {
      if (tok.get(i).startsWith("$")) {
        String m = matches.get(tok.get(i));
        if (m != null)
          tok.set(i, m);
      }
    }
    return join(tok);
  }
  
  static void addStatement(String s) {
    for (String st : statements)
      if (match3(st, s))
        return;
    statements.add(s);
  }
  
    public static String unquote(String s) {
    if (s.startsWith("[")) {
      int i = 1;
      while (i < s.length() && s.charAt(i) == '=') ++i;
      if (i < s.length() && s.charAt(i) == '[') {
        String m = s.substring(1, i);
        if (s.endsWith("]" + m + "]"))
          return s.substring(i+1, s.length()-i-1);
      }
    }
    
    if (s.startsWith("\"") && s.endsWith("\"") && s.length() > 1) {
      String st = s.substring(1, s.length()-1);
      StringBuilder sb = new StringBuilder(st.length());
  
      for (int i = 0; i < st.length(); i++) {
        char ch = st.charAt(i);
        if (ch == '\\') {
          char nextChar = (i == st.length() - 1) ? '\\' : st
                  .charAt(i + 1);
          // Octal escape?
          if (nextChar >= '0' && nextChar <= '7') {
              String code = "" + nextChar;
              i++;
              if ((i < st.length() - 1) && st.charAt(i + 1) >= '0'
                      && st.charAt(i + 1) <= '7') {
                  code += st.charAt(i + 1);
                  i++;
                  if ((i < st.length() - 1) && st.charAt(i + 1) >= '0'
                          && st.charAt(i + 1) <= '7') {
                      code += st.charAt(i + 1);
                      i++;
                  }
              }
              sb.append((char) Integer.parseInt(code, 8));
              continue;
          }
          switch (nextChar) {
          case '\\':
              ch = '\\';
              break;
          case 'b':
              ch = '\b';
              break;
          case 'f':
              ch = '\f';
              break;
          case 'n':
              ch = '\n';
              break;
          case 'r':
              ch = '\r';
              break;
          case 't':
              ch = '\t';
              break;
          case '\"':
              ch = '\"';
              break;
          case '\'':
              ch = '\'';
              break;
          // Hex Unicode: u????
          case 'u':
              if (i >= st.length() - 5) {
                  ch = 'u';
                  break;
              }
              int code = Integer.parseInt(
                      "" + st.charAt(i + 2) + st.charAt(i + 3)
                              + st.charAt(i + 4) + st.charAt(i + 5), 16);
              sb.append(Character.toChars(code));
              i += 5;
              continue;
          }
          i++;
        }
        sb.append(ch);
      }
      return sb.toString();      
    } else
      return s; // return original
  } // unquote
  static boolean parseBoolean(String s) {
  return eq(s, "true");
} // parseBoolean
  static String formatSnippetID(String id) {
  return "#" + parseSnippetID(id);
}

static String formatSnippetID(long id) {
  return "#" + id;
} // formatSnippetID
  
  static class MultiMap<A,B> {
  Map<A, List<B>> data = new HashMap<A, List<B>>();

  public void put(A key, B value) {
    List<B> list = data.get(key);
    if (list == null)
      data.put(key, list = new ArrayList<B>());
    list.add(value);
  }

  public void putAll(A key, Collection<B> values) {
    for (B value : values)
      put(key, value);
  }

  public List<B> get(A key) {
    List<B> list = data.get(key);
    return list == null ? Collections.<B> emptyList() : list;
  }

  public Set<A> keySet() {
    return data.keySet();
  }

  public void remove(A key) {
    data.remove(key);
  }

  public void remove(A key, B value) {
    List<B> list = data.get(key);
    if (list != null) {
      list.remove(value);
      if (list.isEmpty())
        data.remove(key);
    }
  }

  public void clear() {
    data.clear();
  }

  public boolean contains(A key) {
    return data.containsKey(key);
  }

  public B getFirst(A key) {
    List<B> list = get(key);
    return list.isEmpty() ? null : list.get(0);
  }
} // MultiMap

  static String quote(String s) {
    if (s == null) return "null";
    return "\"" + s.replace("\\", "\\\\").replace("\"", "\\\"").replace("\r", "\\r").replace("\n", "\\n") + "\"";
  }
  
  static String quote(long l) {
    return quote("" + l);
  }


  static List<String> parse3(String s) {
    return dropPunctuation(javaTokPlusPeriod(s));
  }


    static class Matches {
    String[] m;
    String unq(int i) { return unquote(m[i]); }
    String fsi(int i) { return formatSnippetID(unq(i)); }
    boolean bool(int i) { return parseBoolean(unq(i)); }
  }
 // class Matches
  
  static boolean match3(String pat, String s) {
    return match3(pat, s, null);
  }
  
  static boolean match3(String pat, String s, Matches matches) {
    if (s == null) return false;
    List<String> tokpat = parse3(pat), toks = parse3(s);
    String[] m = match2(tokpat, toks);
    //print(structure(tokpat) + " on " + structure(toks) + " => " + structure(m));
    if (m == null)
      return false;
    else {
      if (matches != null) matches.m = m;
      return true;
    }
  }

static boolean eq(Object a, Object b) {
  return a == null ? b == null : a.equals(b);
}

// This is made for NL parsing.
// It's javaTok extended with "..." token and "$n"

static List<String> javaTokPlusPeriod(String s) {
  List<String> tok = new ArrayList<String>();
  int l = s.length();
  
  int i = 0;
  while (i < l) {
    int j = i;
    char c; String cc;
    
    // scan for whitespace
    while (j < l) {
      c = s.charAt(j);
      cc = s.substring(j, Math.min(j+2, l));
      if (c == ' ' || c == '\t' || c == '\r' || c == '\n')
        ++j;
      else if (cc.equals("/*")) {
        do ++j; while (j < l && !s.substring(j, Math.min(j+2, l)).equals("*/"));
        j = Math.min(j+2, l);
      } else if (cc.equals("//")) {
        do ++j; while (j < l && "\r\n".indexOf(s.charAt(j)) < 0);
      } else
        break;
    }
    
    tok.add(s.substring(i, j));
    i = j;
    if (i >= l) break;
    c = s.charAt(i);
    cc = s.substring(i, Math.min(i+2, l));

    // scan for non-whitespace
    if (c == '\'' || c == '"') {
      char opener = c;
      ++j;
      while (j < l) {
        if (s.charAt(j) == opener) {
          ++j;
          break;
        } else if (s.charAt(j) == '\\' && j+1 < l)
          j += 2;
        else
          ++j;
      }
    } else if (Character.isJavaIdentifierStart(c))
      do ++j; while (j < l && (Character.isJavaIdentifierPart(s.charAt(j)) || s.charAt(j) == '\'')); // for things like "this one's"
    else if (Character.isDigit(c))
      do ++j; while (j < l && Character.isDigit(s.charAt(j)));
    else if (cc.equals("[[")) {
      do ++j; while (j+1 < l && !s.substring(j, j+2).equals("]]"));
      j = Math.min(j+2, l);
    } else if (s.substring(j, Math.min(j+3, l)).equals("..."))
      j += 3;
    else if (c == '$')
      do ++j; while (j < l && Character.isDigit(s.charAt(j)));
    else
      ++j;

    tok.add(s.substring(i, j));
    i = j;
  }
  
  if ((tok.size() % 2) == 0) tok.add("");
  return tok;
}


static void print() {
  System.out.println();
}

static void print(Object o) {
  System.out.println(o);
}

static void print(long i) {
  System.out.println(i);
}

  public static String fromLines(List<String> lines) {
    StringBuilder buf = new StringBuilder();
    for (String line : lines) {
      buf.append(line).append('\n');
    }
    return buf.toString();
  }

  public static String join(String glue, Iterable<String> strings) {
    StringBuilder buf = new StringBuilder();
    Iterator<String> i = strings.iterator();
    if (i.hasNext()) {
      buf.append(i.next());
      while (i.hasNext())
        buf.append(glue).append(i.next());
    }
    return buf.toString();
  }
  
  public static String join(String glue, String[] strings) {
    return join(glue, Arrays.asList(strings));
  }
  
  public static String join(Iterable<String> strings) {
    return join("", strings);
  }
  
  public static String join(String[] strings) {
    return join("", strings);
  }


static Object get(Object o, String field) {
  if (o instanceof Class) return get((Class) o, field);
  try {
    Field f = get_findField(o.getClass(), field);
    f.setAccessible(true);
    return f.get(o);
  } catch (Exception e) {
    throw new RuntimeException(e);
  }
}

static Object get(Class c, String field) {
  try {
    Field f = get_findStaticField(c, field);
    f.setAccessible(true);
    return f.get(null);
  } catch (Exception e) {
    throw new RuntimeException(e);
  }
}

static Field get_findStaticField(Class<?> c, String field) {
  for (Field f : c.getDeclaredFields())
    if (f.getName().equals(field) && (f.getModifiers() & Modifier.STATIC) != 0)
      return f;
  throw new RuntimeException("Static field '" + field + "' not found in " + c.getName());
}

static Field get_findField(Class<?> c, String field) {
  for (Field f : c.getDeclaredFields())
    if (f.getName().equals(field))
      return f;
  throw new RuntimeException("Field '" + field + "' not found in " + c.getName());
}

static String structure(Object o) {
  return structure(o, 0);
}

// leave to false, unless unstructure() breaks
static boolean structure_allowShortening = false;
  
static String structure(Object o, int stringSizeLimit) {
  if (o == null) return "null";
  String name = o.getClass().getName();
  
  StringBuilder buf = new StringBuilder();
  
  if (o instanceof Collection) { // TODO: store the type (e.g. HashSet/TreeSet)
    for (Object x : (Collection) o) {
      if (buf.length() != 0) buf.append(", ");
      buf.append(structure(x, stringSizeLimit));
    }
    return "[" + buf + "]";
  }
  
  if (o instanceof Map) {
    for (Object e : ((Map) o).entrySet()) {
      if (buf.length() != 0) buf.append(", ");
      buf.append(structure(((Map.Entry) e).getKey(), stringSizeLimit));
      buf.append("=");
      buf.append(structure(((Map.Entry) e).getValue(), stringSizeLimit));
    }
    return "{" + buf + "}";
  }
  
  if (o.getClass().isArray()) {
    int n = Array.getLength(o);
    for (int i = 0; i < n; i++) {
      if (buf.length() != 0) buf.append(", ");
      buf.append(structure(Array.get(o, i), stringSizeLimit));
    }
    return "array{" + buf + "}";
  }

  if (o instanceof String)
    return quote(stringSizeLimit != 0 ? shorten((String) o, stringSizeLimit) : (String) o);
  
  // Need more cases? This should cover all library classes...
  if (name.startsWith("java.") || name.startsWith("javax."))
    return String.valueOf(o);
    
  String shortName = o.getClass().getName().replaceAll("^main\\$", "");
  
  int numFields = 0;
  String fieldName = "";
  if (shortName.equals("DynamicObject")) {
    shortName = (String) get(o, "className");
    Map<String, Object> fieldValues = (Map) get(o, "fieldValues");
    
    for (String _fieldName : fieldValues.keySet()) {
      fieldName = _fieldName;
      Object value = fieldValues.get(fieldName);
      if (value != null) {
        if (buf.length() != 0) buf.append(", ");
        buf.append(fieldName + "=" + structure(value, stringSizeLimit));
      }
      ++numFields;
   }
  } else {
    // regular class
    // TODO: go to superclasses too
    Field[] fields = o.getClass().getDeclaredFields();
    for (Field field : fields) {
      if ((field.getModifiers() & Modifier.STATIC) != 0)
        continue;
      Object value;
      try {
        field.setAccessible(true);
        value = field.get(o);
      } catch (Exception e) {
        value = "?";
      }
      
      fieldName = field.getName();
      
      // put special cases here...
  
      if (value != null) {
        if (buf.length() != 0) buf.append(", ");
        buf.append(fieldName + "=" + structure(value, stringSizeLimit));
      }
      ++numFields;
    }
  }
  
  String b = buf.toString();
  
  if (numFields == 1 && structure_allowShortening)
    b = b.replaceAll("^" + fieldName + "=", ""); // drop field name if only one
  String s = shortName;
  if (buf.length() != 0)
    s += "(" + b + ")";
  return s;
}

public static long parseSnippetID(String snippetID) {
  return Long.parseLong(shortenSnippetID(snippetID));
}

static List<String> dropPunctuation(List<String> tok) {
  tok = new ArrayList<String>(tok);
  for (int i = 1; i < tok.size(); i += 2) {
    String t = tok.get(i);
    if (t.length() == 1 && !Character.isLetter(t.charAt(0)) && !Character.isDigit(t.charAt(0)) && !t.equals("*")) {
      tok.set(i-1, tok.get(i-1) + tok.get(i+1));
      tok.remove(i);
      tok.remove(i);
      i -= 2;
    }
  }
  return tok;
}

// match2 matches multiple "*" (matches a single token) wildcards and zero or one "..." wildcards (matches multiple tokens)

static String[] match2(List<String> pat, List<String> tok) {
  // standard case (no ...)
  int i = pat.indexOf("...");
  if (i < 0) return match2_match(pat, tok);
  
  pat = new ArrayList<String>(pat); // We're modifying it, so copy first
  pat.set(i, "*");
  while (pat.size() < tok.size()) {
    pat.add(i, "*");
    pat.add(i+1, ""); // doesn't matter
  }
  
  return match2_match(pat, tok);
}

static String[] match2_match(List<String> pat, List<String> tok) {
  List<String> result = new ArrayList<String>();
  if (pat.size() != tok.size()) {
    /*if (debug)
      print("Size mismatch: " + structure(pat) + " vs " + structure(tok));*/
    return null;
  }
  for (int i = 1; i < pat.size(); i += 2) {
    String p = pat.get(i), t = tok.get(i);
    /*if (debug)
      print("Checking " + p + " against " + t);*/
    if ("*".equals(p))
      result.add(t);
    else if (!p.equalsIgnoreCase(t))
      return null;
  }
  return result.toArray(new String[result.size()]);
}


static String shorten(String s, int max) {
  return s.length() <= max ? s : s.substring(0, Math.min(s.length(), max)) + "...";
}

static String shortenSnippetID(String snippetID) {
  if (snippetID.startsWith("#"))
    snippetID = snippetID.substring(1);
  String httpBlaBla = "http://tinybrain.de/";
  if (snippetID.startsWith(httpBlaBla))
    snippetID = snippetID.substring(httpBlaBla.length());
  return snippetID;
}
}