import java.util.*;
import java.util.zip.*;
import java.util.List;
import java.util.regex.*;
import java.util.concurrent.*;
import java.util.concurrent.atomic.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.*;
import javax.swing.table.*;
import java.io.*;
import java.net.*;
import java.lang.reflect.*;
import java.lang.ref.*;
import java.lang.management.*;
import java.security.*;
import java.security.spec.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import javax.imageio.*;
import java.math.*;
public class main {
static class Tag {
  String name;
}

static class SlackMsg {
  String user, botName; // one of these is going to be set
  String userName; // looked up if user != null
  String type, text, ts;
  Object reactions;
  String channelID;
  
  int index;
  TreeSet<String> tags = new TreeSet<String>();
}

static PersistentMap<String, List<Tag>> tagMap;
static PersistentLog<SlackMsg> msgs;
static List<SlackMsg> taggedMsgs = new ArrayList<SlackMsg>();
static TreeMap<Integer, SlackMsg> msgsByIndex = new TreeMap<Integer, SlackMsg>();
static MultiMap<String, SlackMsg> msgsByTag = new MultiMap<String, SlackMsg>();

static void init() {
  tagMap = new PersistentMap("#1002192", "tagsByTS.log");
  print("Tags: " + l(tagMap));
  
  String channelName = "talkingbots";
  msgs = new PersistentLog("#1002185", parseChannelName(channelName) + ".msgs");
  print("Msgs: " + l(msgs));
  if (empty(tagMap) || empty(msgs)) fail("no data");
  
  //printStructure(last(msgs));
  
  // put tags and index in messages
  int n = 1;
  for (SlackMsg msg : msgs) {
    List<Tag> tags = tagMap.get(msg.ts);
    /*if (nempty(tags))
      print(structure(tags) + " " + structure(msg));*/
    msg.text = trim(msg.text);
    msg.index = n++;
    msgsByIndex.put(msg.index, msg);
    for (Tag t : unnull(tags)) {
      if (msg.tags.add(t.name))
        msgsByTag.put(t.name, msg);
    }
    if (nempty(msg.tags))
      taggedMsgs.add(msg);
  }
  
  print(l(taggedMsgs) + " tagged msgs.");
}

static void filterTag(String tag) {
  for (SlackMsg msg : msgs) {
    msg.tags = msg.tags.contains(tag) ? littreeset(tag) : main.<String> littreeset();
  }
} // load log & tags

static HashSet<SlackMsg> train = new HashSet<SlackMsg>();
static HashSet<SlackMsg> test = new HashSet<SlackMsg>();
  
static List<Learner> learners = new ArrayList<Learner>();

static String tag; // only focusing on one tag

// a function that tags messages
static class Function {
  List<String> tag(SlackMsg msg) { return emptyList(); }
}

static class Learner {
  void learnAll(List<SlackMsg> l) {
    for (SlackMsg msg : l)
      learn(msg);
  }
  
  void learn(SlackMsg msg) {}

  // a learner can make multiple functions  
  Function nextFunction() { return null; }
}

static class DetectWord extends Function {
  String word;
  
  DetectWord() {}
  DetectWord(String word) {
  this.word = word;}
  
  List<String> tag(SlackMsg msg) {
    // rough
    boolean b = containsIgnoreCase(msg.text, word);
    
    /*if (eq(word, "bot"))
      print("[debug] " + b + " " + msg.text);*/
      
    return b ? litlist(tag) : emptyList();
  }
}

static class EndsWith extends Function {
  String s;
  
  EndsWith() {}
  EndsWith(String s) {
  this.s = s;}
  
  List<String> tag(SlackMsg msg) {
    boolean b = endsWithIgnoreCase(msg.text, s);
    return b ? litlist(tag) : emptyList();
  }
}

static class LTryPlusWord extends Learner {
  String functionClass = /*"DetectWord"*/"EndsWith";
  HashSet<String> allWords = new HashSet<String>();
  Iterator<String> it;

  void learn(SlackMsg msg) {
    if (msg.tags.contains(tag))
      allWords.addAll(codeTokensOnly(nlTok(dropPunctuation(msg.text))));
  }
  
  Function nextFunction() {
    if (it == null)
      it = allWords.iterator();
    if (!it.hasNext()) return null;
    return (Function) newInstance("main$" + functionClass, it.next());
  }
}

static int errors(SlackMsg msg, List<String> tags) {
  int n = 0;
  for (String tag : msg.tags)
    if (!tags.contains(tag))
      ++n;
  for (String tag : tags)
    if (!msg.tags.contains(tag))
      ++n;
  return n;
}

static List<String> getErrors(SlackMsg msg, List<String> tags) {
  List<String> l = new ArrayList<String>();
  for (String tag : msg.tags)
    if (!tags.contains(tag))
      l.add("-" + tag);
  for (String tag : tags)
    if (!msg.tags.contains(tag))
      l.add("+" + tag);
  return l;
}

static void printTest() {
  for (SlackMsg msg : test) 
    print(structure(msg.tags) + " " + msg.text);
}

public static void main(String[] args) throws Exception {
  init();
  
  tag = "bot greeting";
  filterTag(tag);
  makeTrain(tag, 10);
  makeTest(tag, 5);
  
  Map<Function, Integer> scores = new HashMap<Function, Integer>();
  
  test.addAll(train); // test it all
  print("Test size: " + l(test));
  printTest();
  
  // make learners
  learners.add(new LTryPlusWord());
  
  List<SlackMsg> lTrain = asList(train);
  for (Learner l : learners) try { 
    l.learnAll(lTrain);
    
    Function f;
    while ((f = l.nextFunction()) != null) {
      int score = 0;
      for (SlackMsg msg : test)
        score -= errors(msg, f.tag(msg));
      print("Score " + score + " for " + structure(f));
      scores.put(f, score);
    }
  } catch (Throwable __e) { printStackTrace(__e); }
  
  int baseScore = -countTags(test);
  print("Base score: " + baseScore);
  
  Function best = highest(scores);
  if (best == null)
    print("No winner");
  else {
    int score = scores.get(best);
    print("Best score: " + score + ", winner: " + structure(best));
    printMistakes(best);
  }
}

static void printMistakes(Function f) {
  for (SlackMsg msg : test) {
    List<String> l = getErrors(msg, f.tag(msg));
    if (nempty(l))
      print("[mistake] " + msg.text + " " + structure(l));
  }
}

static int countTags(Collection<SlackMsg> msgs) {
  int n = 0;
  for (SlackMsg msg : msgs)
    n += l(msg.tags);
  return n;
}

static void makeTrain(String tag, int negFieldSize) {
  makeTagField(train, tag, negFieldSize);
}

static void makeTest(String tag, int negFieldSize) {
  makeTagField(test, tag, negFieldSize);
}

static void makeTagField(HashSet<SlackMsg> dest, String tag, int negFieldSize) {
  List<SlackMsg> plus = msgsByTag.get(tag);
  
  // add plus
  dest.addAll(plus);
  
  // add neg fields of all plus messages
  for (SlackMsg m : plus)
    dest.addAll(makeNegField(m, negFieldSize));
}

static Collection<SlackMsg> makeNegField(SlackMsg msg, int size)  {
  HashSet<SlackMsg> field = new HashSet<SlackMsg>();
  if (msg == null) return field;
  int i1 = msg.index-size, i2 = msg.index+size;
  for (int i = i1; i <= i2; i++) {
    SlackMsg m = msgsByIndex.get(i);
    if (m != null)
      field.add(m);
  }
  return field;
}

static <A> TreeSet<A> littreeset(A... items) {
  TreeSet<A> set = new TreeSet<A>();
  for (A a : items) set.add(a);
  return set;
}
static boolean endsWithIgnoreCase(String a, String b) {
  return a != null && l(a) >= l(b) && a.regionMatches(true, l(a)-l(b), b, 0, l(b));
}
static List<String> dropPunctuation_keep = litlist("*", "<", ">");

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)) && !dropPunctuation_keep.contains(t)) {
      tok.set(i-1, tok.get(i-1) + tok.get(i+1));
      tok.remove(i);
      tok.remove(i);
      i -= 2;
    }
  }
  return tok;
}

static String dropPunctuation(String s) {
  return join(dropPunctuation(nlTok(s)));
}

  static String unnull(String s) {
    return s == null ? "" : s;
  }
  
  static <A> List<A> unnull(List<A> l) {
    return l == null ? emptyList() : l;
  }
static boolean nempty(Collection c) {
  return !isEmpty(c);
}

static boolean nempty(String s) {
  return !isEmpty(s);
}
  static List<String> codeTokensOnly(List<String> tok) {
    List<String> l = new ArrayList<String>();
    for (int i = 1; i < tok.size(); i += 2)
      l.add(tok.get(i));
    return l;
  }
static Object newInstance(Class c, Object... args) {
  return nuObject(c, args);
}

static Object newInstance(String className, Object... args) {
  return nuObject(className, args);
}

static boolean containsIgnoreCase(List<String> l, String s) {
  for (String x : l)
    if (eqic(x, s))
      return true;
  return false;
}

static boolean containsIgnoreCase(String[] l, String s) {
  for (String x : l)
    if (eqic(x, s))
      return true;
  return false;
}

static boolean containsIgnoreCase(String s, char c) {
  return indexOfIgnoreCase(s, String.valueOf(c)) >= 0;
}

static boolean containsIgnoreCase(String a, String b) {
  return indexOfIgnoreCase(a, b) >= 0;
}
static int l(Object[] array) {
  return array == null ? 0 : array.length;
}

static int l(byte[] array) {
  return array == null ? 0 : array.length;
}

static int l(int[] array) {
  return array == null ? 0 : array.length;
}

static int l(char[] array) {
  return array == null ? 0 : array.length;
}

static int l(Collection c) {
  return c == null ? 0 : c.size();
}

static int l(Map m) {
  return m == null ? 0 : m.size();
}

static int l(String s) {
  return s == null ? 0 : s.length();
} 


static String structure(Object o) {
  HashSet refd = new HashSet();
  return structure_2(structure_1(o, 0, new IdentityHashMap(), refd), refd);
}

// leave to false, unless unstructure() breaks
static boolean structure_allowShortening = false;

static String structure_1(Object o, int stringSizeLimit, IdentityHashMap<Object, Integer> seen, HashSet<Integer> refd) {
  if (o == null) return "null";
  
  // these are never back-referenced (for readability)
  
  if (o instanceof String)
    return quote(stringSizeLimit != 0 ? shorten((String) o, stringSizeLimit) : (String) o);
    
  if (o instanceof BigInteger)
    return "bigint(" + o + ")";
  
  if (o instanceof Double)
    return "d(" + quote(str(o)) + ")";
    
  if (o instanceof Long)
    return o + "L";
  
  if (o instanceof Integer)
    return str(o);
  
  Integer ref = seen.get(o);
  if (ref != null) {
    refd.add(ref);
    return "r" + ref;
  }
      
  ref = seen.size()+1;
  seen.put(o, ref);
  String r = "m" + ref + " "; // marker

  String name = o.getClass().getName();

  StringBuilder buf = new StringBuilder();
  
  if (o instanceof HashSet)
    return r + "hashset " + structure_1(new ArrayList((Set) o), stringSizeLimit, seen, refd);

  if (o instanceof TreeSet)
    return r + "treeset " + structure_1(new ArrayList((Set) o), stringSizeLimit, seen, refd);
  
  if (o instanceof Collection) {
    for (Object x : (Collection) o) {
      if (buf.length() != 0) buf.append(", ");
      buf.append(structure_1(x, stringSizeLimit, seen, refd));
    }
    return r + "[" + buf + "]";
  }
  
  if (o instanceof Map) {
    for (Object e : ((Map) o).entrySet()) {
      if (buf.length() != 0) buf.append(", ");
      buf.append(structure_1(((Map.Entry) e).getKey(), stringSizeLimit, seen, refd));
      buf.append("=");
      buf.append(structure_1(((Map.Entry) e).getValue(), stringSizeLimit, seen, refd));
    }
    return r + (o instanceof HashMap ? "hashmap" : "") + "{" + 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_1(Array.get(o, i), stringSizeLimit, seen, refd));
    }
    return r + "array{" + buf + "}";
  }

  if (o instanceof Class)
    return r + "class(" + quote(((Class) o).getName()) + ")";
    
  if (o instanceof Throwable)
    return r + "exception(" + quote(((Throwable) o).getMessage()) + ")";
    
  // Need more cases? This should cover all library classes...
  if (name.startsWith("java.") || name.startsWith("javax."))
    return r + String.valueOf(o);
    
  String shortName = o.getClass().getName().replaceAll("^main\\$", "");
  
  if (shortName.equals("Lisp")) {
    buf.append("l(" + structure_1(getOpt(o, "head"), stringSizeLimit, seen, refd));
    List args = (List) ( getOpt(o, "args"));
    if (nempty(args))
      for (int i = 0; i < l(args); i++) {
        buf.append(", ");
        Object arg = args.get(i);
        
        // sweet shortening
        if (arg != null && eq(arg.getClass().getName(), "main$Lisp") && isTrue(call(arg, "isEmpty")))
          arg = get(arg, "head");
          
        buf.append(structure_1(arg, stringSizeLimit, seen, refd));
      }
    buf.append(")");
    return r + str(buf);
  }
    
  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_1(value, stringSizeLimit, seen, refd));
      }
      ++numFields;
   }
  } else {
    // regular class
    
    Class c = o.getClass();
    while (c != Object.class) {
      Field[] fields = c.getDeclaredFields();
      for (Field field : fields) {
        if ((field.getModifiers() & Modifier.STATIC) != 0)
          continue;
        fieldName = field.getName();
        
        // skip outer object reference
        if (fieldName.indexOf("$") >= 0) continue;
  
        Object value;
        try {
          field.setAccessible(true);
          value = field.get(o);
        } catch (Exception e) {
          value = "?";
        }
        
        // put special cases here...
    
        if (value != null) {
          if (buf.length() != 0) buf.append(", ");
          buf.append(fieldName + "=" + structure_1(value, stringSizeLimit, seen, refd));
        }
        ++numFields;
      }
      c = c.getSuperclass();
    }
  }
  
  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 r + s;
}

// drop unused markers
static String structure_2(String s, HashSet<Integer> refd) {
  List<String> tok = javaTok(s);
  StringBuilder out = new StringBuilder();
  for (int i = 1; i < l(tok); i += 2) {
    String t = tok.get(i);
    if (t.startsWith("m") && isInteger(t.substring(1))
      && !refd.contains(parseInt(t.substring(1))))
      continue;
    out.append(t).append(tok.get(i+1));
  }
  return str(out);
}

static <A> ArrayList<A> asList(A[] a) {
  return new ArrayList<A>(Arrays.asList(a));
}

static ArrayList<Integer> asList(int[] a) {
  ArrayList<Integer> l = new ArrayList();
  for (int i : a) l.add(i);
  return l;
}

static <A> ArrayList<A> asList(Collection<A> s) {
  return s == null ? new ArrayList() 
    : s instanceof ArrayList ? (ArrayList) s : new ArrayList(s);
}
static boolean empty(Collection c) {
  return isEmpty(c);
}

static boolean empty(String s) {
  return isEmpty(s);
}

static boolean empty(Map map) {
  return map == null || map.isEmpty();
}
  static RuntimeException fail() {
    throw new RuntimeException("fail");
  }
  
  static RuntimeException fail(Object msg) {
    throw new RuntimeException(String.valueOf(msg));
  }
  
  static RuntimeException fail(String msg) {
    throw new RuntimeException(unnull(msg));
  }
    
  static RuntimeException fail(String msg, Object... args) {
    throw new RuntimeException(format(msg, args));
  }
static volatile StringBuffer local_log = new StringBuffer(); // not redirected
static volatile StringBuffer print_log = local_log; // might be redirected, e.g. to main bot

// in bytes - will cut to half that
static volatile int print_log_max = 1024*1024;
static volatile int local_log_max = 100*1024;

static void print() {
  print("");
}

// slightly overblown signature to return original object...
static <A> A print(A o) {
  String s = String.valueOf(o) + "\n";
  StringBuffer loc = local_log;
  StringBuffer buf = print_log;
  int loc_max = print_log_max;
  if (buf != loc && buf != null) {
    print_append(buf, s, print_log_max);
    loc_max = local_log_max;
  }
  if (loc != null) 
    print_append(loc, s, loc_max);
  System.out.print(s);
  return o;
}

static void print(long l) {
  print(String.valueOf(l));
}

static void print_append(StringBuffer buf, String s, int max) {
  synchronized(buf) {
    buf.append(s);
    max /= 2;
    if (buf.length() > max) try {
      int newLength = max/2;
      int ofs = buf.length()-newLength;
      String newString = buf.substring(ofs);
      buf.setLength(0);
      buf.append("[...] ").append(newString);
    } catch (Exception e) {
      buf.setLength(0);
    }
  }
}
static List emptyList() {
  return Collections.emptyList();
}
static List<String> nlTok(String s) {
  return javaTokPlusPeriod(s);
}
static String parseChannelName(String name) {
  return dropPrefix("#", formatChannelName(name));
}
static String trim(String s) { return s == null ? null : s.trim(); }
static String trim(StringBuilder buf) { return buf.toString().trim(); }
static String trim(StringBuffer buf) { return buf.toString().trim(); }
static <A, B extends Number> A highest(Map<A, B> map) {
  return keyWithBiggestValue(map);
}
static <A> ArrayList<A> litlist(A... a) {
  return new ArrayList<A>(Arrays.asList(a));
}
static String tag(String tag, String contents, Object... params) {
  return htag(tag, contents, params);
}

static String tag(String tag, StringBuilder contents, Object... params) {
  return htag(tag, contents, params);
}

static String tag(String tag, StringBuffer contents, Object... params) {
  return htag(tag, contents, params);
}

// also does validity testing
static String formatChannelName(String name) {
  name = dropPrefix("#", name);
  assertTrue(isIdentifier(name));
  return "#" + name;
}
static String htag(String tag, String contents, Object... params) {
  StringBuilder buf = new StringBuilder();
  buf.append("<" + tag);
  for (int i = 0; i < l(params); i += 2) {
    Object val = get(params, i+1);
    if (val != null) {
      String s = str(val);
      if (!empty(s))
        buf.append(" " + get(params, i) + "=" + htmlQuote(s));
    }
  }
  buf.append(">" + contents + "</" + tag + ">");
  return str(buf);
}

// the usual convenience shortcut for StringBuilder instead of string...
static String htag(String tag, StringBuilder contents, Object... params) {
  return htag(tag, str(contents), params);
}

// same with StringBuffer
static String htag(String tag, StringBuffer contents, Object... params) {
  return htag(tag, str(contents), params);
}
// replacement for class JavaTok
// maybe incomplete, might want to add floating point numbers
// todo also: extended multi-line strings

static List<String> javaTok(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 is not needed in rest of loop body
    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 || s.charAt(j) == '\n') { // end at \n to not propagate unclosed string literal errors
          ++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)) || "'".indexOf(s.charAt(j)) >= 0)); // for stuff like "don't"
    else if (Character.isDigit(c)) {
      do ++j; while (j < l && Character.isDigit(s.charAt(j)));
      if (j < l && s.charAt(j) == 'L') ++j; // Long constants like 1L
    } else if (cc.equals("[[")) {
      do ++j; while (j+1 < l && !s.substring(j, j+2).equals("]]"));
      j = Math.min(j+2, l);
    } else if (cc.equals("[=") && i+2 < l && s.charAt(i+2) == '[') {
      do ++j; while (j+2 < l && !s.substring(j, j+3).equals("]=]"));
      j = Math.min(j+3, l);
    } else
      ++j;

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

static List<String> javaTok(List<String> tok) {
  return javaTok(join(tok));
}
static boolean isInteger(String s) {
  return s != null && Pattern.matches("\\-?\\d+", s);
}
  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 String shorten(String s, int max) {
  if (s == null) return "";
  return s.length() <= max ? s : s.substring(0, Math.min(s.length(), max)) + "...";
}
// get purpose 1: access a list/array (safer version of x.get(y))

static <A> A get(List<A> l, int idx) {
  return idx >= 0 && idx < l(l) ? l.get(idx) : null;
}

static <A> A get(A[] l, int idx) {
  return idx >= 0 && idx < l(l) ? l[idx] : null;
}

// get purpose 2: access a field by reflection or a map

static Object get(Object o, String field) {
  if (o instanceof Class) return get((Class) o, field);
  
  if (o instanceof Map)
    return ((Map) o).get(field);
    
  if (o.getClass().getName().equals("main$DynamicObject"))
    return call(get_raw(o, "fieldValues"), "get", field);
    
  return get_raw(o, field);
}

static Object get_raw(Object o, String 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) {
  Class _c = c;
  do {
    for (Field f : _c.getDeclaredFields())
      if (f.getName().equals(field) && (f.getModifiers() & Modifier.STATIC) != 0)
        return f;
    _c = _c.getSuperclass();
  } while (_c != null);
  throw new RuntimeException("Static field '" + field + "' not found in " + c.getName());
}

static Field get_findField(Class<?> c, String field) {
  Class _c = c;
  do {
    for (Field f : _c.getDeclaredFields())
      if (f.getName().equals(field))
        return f;
    _c = _c.getSuperclass();
  } while (_c != null);
  throw new RuntimeException("Field '" + field + "' not found in " + c.getName());
}
  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 String dropPrefix(String prefix, String s) {
  return s.startsWith(prefix) ? s.substring(l(prefix)) : s;
}
static boolean isEmpty(Collection c) {
  return c == null || c.isEmpty();
}

static boolean isEmpty(String s) {
  return s == null || s.length() == 0;
}
  static String format(String pat, Object... args) {
    return format3(pat, args);
  }

static boolean eqic(String a, String b) {
  if ((a == null) != (b == null)) return false;
  if (a == null) return true;
  return a.equalsIgnoreCase(b);
}
static boolean eq(Object a, Object b) {
  if (a == null) return b == null;
  if (a.equals(b)) return true;
  if (a instanceof BigInteger) {
    if (b instanceof Integer) return a.equals(BigInteger.valueOf((Integer) b));
    if (b instanceof Long) return a.equals(BigInteger.valueOf((Long) b));
  }
  return false;
}
static String str(Object o) {
  return String.valueOf(o);
}
  // varargs assignment fixer for a single string array argument
  static Object call(Object o, String method, String[] arg) {
    return call(o, method, new Object[] {arg});
  }
  
  static Object call(Object o, String method, Object... args) {
    try {
      if (o instanceof Class) {
        Method m = call_findStaticMethod((Class) o, method, args, false);
        m.setAccessible(true);
        return m.invoke(null, args);
      } else {
        Method m = call_findMethod(o, method, args, false);
        m.setAccessible(true);
        return m.invoke(o, args);
      }
    } catch (Exception e) {
      throw e instanceof RuntimeException ? (RuntimeException) e : new RuntimeException(e);
    }
  }

  static Method call_findStaticMethod(Class c, String method, Object[] args, boolean debug) {
    Class _c = c;
    while (c != null) {
      for (Method m : c.getDeclaredMethods()) {
        if (debug)
          System.out.println("Checking method " + m.getName() + " with " + m.getParameterTypes().length + " parameters");;
        if (!m.getName().equals(method)) {
          if (debug) System.out.println("Method name mismatch: " + method);
          continue;
        }

        if ((m.getModifiers() & Modifier.STATIC) == 0 || !call_checkArgs(m, args, debug))
          continue;

        return m;
      }
      c = c.getSuperclass();
    }
    throw new RuntimeException("Method '" + method + "' (static) with " + args.length + " parameter(s) not found in " + _c.getName());
  }

  static Method call_findMethod(Object o, String method, Object[] args, boolean debug) {
    Class c = o.getClass();
    while (c != null) {
      for (Method m : c.getDeclaredMethods()) {
        if (debug)
          System.out.println("Checking method " + m.getName() + " with " + m.getParameterTypes().length + " parameters");;
        if (m.getName().equals(method) && call_checkArgs(m, args, debug))
          return m;
      }
      c = c.getSuperclass();
    }
    throw new RuntimeException("Method '" + method + "' (non-static) with " + args.length + " parameter(s) not found in " + o.getClass().getName());
  }

  private static boolean call_checkArgs(Method m, Object[] args, boolean debug) {
    Class<?>[] types = m.getParameterTypes();
    if (types.length != args.length) {
      if (debug)
        System.out.println("Bad parameter length: " + args.length + " vs " + types.length);
      return false;
    }
    for (int i = 0; i < types.length; i++)
      if (!(args[i] == null || isInstanceX(types[i], args[i]))) {
        if (debug)
          System.out.println("Bad parameter " + i + ": " + args[i] + " vs " + types[i]);
        return false;
      }
    return true;
  }


static int parseInt(String s) {
  return Integer.parseInt(s);
}
static boolean isTrue(Object o) {
  return booleanValue(o);
}
static Object getOpt(Object o, String field) {
  if (o instanceof String) o = getBot ((String) o);
  if (o == null) return null;
  if (o instanceof Class) return getOpt((Class) o, field);
  
  if (o.getClass().getName().equals("main$DynamicObject"))
    return call(getOpt_raw(o, "fieldValues"), "get", field);
  
  if (o instanceof Map) return ((Map) o).get(field);
  
  return getOpt_raw(o, field);
}

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

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

static Field getOpt_findStaticField(Class<?> c, String field) {
  Class _c = c;
  do {
    for (Field f : _c.getDeclaredFields())
      if (f.getName().equals(field) && (f.getModifiers() & Modifier.STATIC) != 0)
        return f;
    _c = _c.getSuperclass();
  } while (_c != null);
  return null;
}

static Field getOpt_findField(Class<?> c, String field) {
  Class _c = c;
  do {
    for (Field f : _c.getDeclaredFields())
      if (f.getName().equals(field))
        return f;
    _c = _c.getSuperclass();
  } while (_c != null);
  return null;
}
static Object nuObject(String className, Object... args) { try {
 
  return nuObject(Class.forName(className), args);

} catch (Throwable __e) { throw __e instanceof RuntimeException ? (RuntimeException) __e : new RuntimeException(__e); }}

static Object nuObject(Class c, Object... args) { try {
 
  Constructor m = nuObject_findConstructor(c, args);
  m.setAccessible(true);
  return m.newInstance(args);

} catch (Throwable __e) { throw __e instanceof RuntimeException ? (RuntimeException) __e : new RuntimeException(__e); }}

static Constructor nuObject_findConstructor(Class c, Object... args) {
  for (Constructor m : c.getDeclaredConstructors()) {
    if (!nuObject_checkArgs(m.getParameterTypes(), args, false))
      continue;
    return m;
  }
  throw new RuntimeException("Constructor with " + args.length + " matching parameter(s) not found in " + c.getName());
}

 static boolean nuObject_checkArgs(Class[] types, Object[] args, boolean debug) {
    if (types.length != args.length) {
      if (debug)
        System.out.println("Bad parameter length: " + args.length + " vs " + types.length);
      return false;
    }
    for (int i = 0; i < types.length; i++)
      if (!(args[i] == null || isInstanceX(types[i], args[i]))) {
        if (debug)
          System.out.println("Bad parameter " + i + ": " + args[i] + " vs " + types[i]);
        return false;
      }
    return true;
  }
// works on lists and strings and null

static int indexOfIgnoreCase(Object a, Object b) {
  if (a == null) return -1;
  if (a instanceof String) {
     Matcher m = Pattern.compile((String) b, Pattern.CASE_INSENSITIVE + Pattern.LITERAL).matcher((String) a);
     if (m.find()) return m.start(); else return -1;
  }
  if (a instanceof List) {
    for (int i = 0; i < ((List) a).size(); i++) {
      Object o = ((List) a).get(i);
      if (o != null && ((String) o).equalsIgnoreCase((String) b))
        return i;
    }
    return -1;
  }
  throw fail("Unknown type: " + a);
}
// This is made for NL parsing.
// It's javaTok extended with "..." token, "$n" and "#n" and
// special quotes (which are converted to normal ones).

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 == '\u201C' || c == '\u201D') c = '"'; // normalize quotes
    if (c == '\'' || c == '"') {
      char opener = c;
      ++j;
      while (j < l) {
        char _c = s.charAt(j);
        if (_c == '\u201C' || _c == '\u201D') _c = '"'; // normalize quotes
        if (_c == opener) {
          ++j;
          break;
        } else if (s.charAt(j) == '\\' && j+1 < l)
          j += 2;
        else
          ++j;
      }
      if (j-1 >= i+1) {
        tok.add(opener + s.substring(i+1, j-1) + opener);
        i = j;
        continue;
      }
    } 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 (cc.equals("[=") && i+2 < l && s.charAt(i+2) == '[') {
      do ++j; while (j+2 < l && !s.substring(j, j+3).equals("]=]"));
      j = Math.min(j+3, l);
    } else if (s.substring(j, Math.min(j+3, l)).equals("..."))
      j += 3;
    else if (c == '$' || 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 <A, B extends Number> A keyWithBiggestValue(Map<A, B> map) {
  A best = null;
  Number bestScore = null;
  for (A key : keys(map)) {
    Number score = map.get(key);
    if (best == null || cmp(score, bestScore) > 0) {
      best = key;
      bestScore = score;
    }
  }
  return best;
}

static boolean isIdentifier(String s) {
  return isJavaIdentifier(s);
}
  static String format3(String pat, Object... args) {
    if (args.length == 0) return pat;
    
    List<String> tok = javaTokPlusPeriod(pat);
    int argidx = 0;
    for (int i = 1; i < tok.size(); i += 2)
      if (tok.get(i).equals("*"))
        tok.set(i, format3_formatArg(argidx < args.length ? args[argidx++] : "null"));
    return join(tok);
  }
  
  static String format3_formatArg(Object arg) {
    if (arg == null) return "null";
    if (arg instanceof String) {
      String s = (String) arg;
      return isIdentifier(s) || isNonNegativeInteger(s) ? s : quote(s);
    }
    if (arg instanceof Integer || arg instanceof Long) return String.valueOf(arg);
    return quote(structure(arg));
  }
  

static Object getBot(String botID) {
  return call(getMainBot(), "getBot", botID);
}

// extended over Class.isInstance() to handle primitive types
static boolean isInstanceX(Class type, Object arg) {
  if (type == boolean.class) return arg instanceof Boolean;
  if (type == int.class) return arg instanceof Integer;
  if (type == long.class) return arg instanceof Long;
  if (type == float.class) return arg instanceof Float;
  if (type == short.class) return arg instanceof Short;
  if (type == char.class) return arg instanceof Character;
  if (type == byte.class) return arg instanceof Byte;
  if (type == double.class) return arg instanceof Double;
  return type.isInstance(arg);
}
static boolean booleanValue(Object o) {
  return eq(true, o);
}
static String htmlQuote(String s) {
  return "\"" + htmlencode(s) + "\"";
}
static <A, B> Set<A> keys(Map<A, B> map) {
  return map.keySet();
}

static Set keys(Object map) {
  return keys((Map) map);
}
static int cmp(Number a, Number b) {
  return a == null ? b == null ? 0 : -1 : cmp(a.doubleValue(), b.doubleValue());
}

static int cmp(double a, double b) {
  return a < b ? -1 : a == b ? 0 : 1;
}

static int cmp(String a, String b) {
  return a == null ? b == null ? 0 : -1 : a.compareTo(b);
}

static int cmp(Object a, Object b) {
  if (a == null) return b == null ? 0 : -1;
  return ((Comparable) a).compareTo(b);
}
static void assertTrue(Object o) {
  assertEquals(true, o);
}
  
static boolean assertTrue(String msg, boolean b) {
  if (!b)
    fail(msg);
  return b;
}

static boolean assertTrue(boolean b) {
  if (!b)
    fail("oops");
  return b;
}

static boolean isNonNegativeInteger(String s) {
  return s != null && Pattern.matches("\\d+", s);
}
static boolean isJavaIdentifier(String s) {
  if (s.length() == 0 || !Character.isJavaIdentifierStart(s.charAt(0)))
    return false;
  for (int i = 1; i < s.length(); i++)
    if (!Character.isJavaIdentifierPart(s.charAt(i)))
      return false;
  return true;
}
static Object mainBot;

static Object getMainBot() {
  return mainBot;
}
static void assertEquals(Object x, Object y) {
  assertEquals(null, x, y);
}

static void assertEquals(String msg, Object x, Object y) {
  if (!(x == null ? y == null : x.equals(y)))
    fail((msg != null ? msg + ": " : "") + structure(x) + " != " + structure(y));
}
  // automagically encode a whole map (keys+values)
  static Map htmlencode(Map o) {
    HashMap bla = new HashMap();
    for (Object key : keys(o)) {
      Object value = o.get(key);
      bla.put(htmlencode(key), htmlencode(value));
    }
    return bla;
  }

  static String htmlencode(Object o) {
    return htmlencode(string(o));
  }
  
  static String htmlencode(String s) {
    if (s == null) return "";
    StringBuilder out = new StringBuilder(Math.max(16, s.length()));
    for (int i = 0; i < s.length(); i++) {
        char c = s.charAt(i);
        if (c > 127 || c == '"' || c == '<' || c == '>' || c == '&') {
            out.append("&#");
            out.append((int) c);
            out.append(';');
        } else {
            out.append(c);
        }
    }
    return out.toString();
  }

static String string(Object o) {
  return String.valueOf(o);
}

static class MultiMap<A,B> {
  Map<A, List<B>> data = new HashMap<A, List<B>>();
  
  MultiMap() {}
  MultiMap(MultiMap<A, B> map) { putAll(map); }

  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 addAll(A key, Collection<B> values) {
    putAll(key, values);
  }
  
  public void addAllIfNotThere(A key, Collection<B> values) {
    for (B value : values)
      setPut(key, value);
  }
  
  void setPut(A key, B value) {
    if (!containsPair(key, value))
      put(key, value);
  }
  
  boolean containsPair(A key, B value) {
    return get(key).contains(value);
  }
  
  public void putAll(A key, Collection<B> values) {
    for (B value : values)
      put(key, value);
  }

  void removeAll(A key, Collection<B> values) {
    for (B value : values)
      remove(key, value);
  }
  
  public List<B> get(A key) {
    List<B> list = data.get(key);
    return list == null ? Collections.<B> emptyList() : list;
  }

  // returns actual mutable live list
  // creates the list if not there
  public List<B> getActual(A key) {
    List<B> list = data.get(key);
    if (list == null)
      data.put(key, list = litlist());
    return list;
  }
 
  void clean(A key) {
    List<B> list = data.get(key);
    if (list != null && list.isEmpty())
      data.remove(key);
  }

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

  public Set<A> keys() {
    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 containsKey(A key) {
    return data.containsKey(key);
  }

  public B getFirst(A key) {
    List<B> list = get(key);
    return list.isEmpty() ? null : list.get(0);
  }
  
  public void putAll(MultiMap<A, B> map) {
    for (A key : map.keySet())
      putAll(key, map.get(key));
  }
  
  // note: expensive operation
  int size() {
    int n = 0;
    for (List l : data.values())
      n += l(l);
    return n;
  }
  
  // expensive operation
  List<A> reverseGet(B b) {
    List<A> l = new ArrayList<A>();
    for (A key : data.keySet())
      if (data.get(key).contains(b))
        l.add(key);
    return l;
  }
}

// a persistent list that only grows (or is clear()ed)
// Note: don't put in static initializer (programID not set yet)
static class PersistentLog<A> extends AbstractList<A> {
  List<A> l = new ArrayList<A>();
  File file;
  
  PersistentLog(String fileName) {
    this(getProgramFile(fileName));
  }
  
  PersistentLog(String progID, String fileName) {
    this(getProgramFile(progID, fileName));
  }
  
  PersistentLog(File file) {
  this.file = file;
    for (String s : scanLog(file)) try { 
      l.add((A) unstructure(s));
    } catch (Throwable __e) { printStackTrace(__e); }
  }
  
  public synchronized int size() {
    return l.size();
  }
  
  public synchronized A get(int i) {
    return l.get(i);
  }
  
  public synchronized boolean add(A a) {
    l.add(a);
    logQuoted(file, structure(a));
    return true;
  }
  
  String fileContents() {
    return loadTextFile(file);
  }
  
  public synchronized void clear() {
    l.clear();
    file.delete();
  }
}

// a persistent map using a clever combination of persisting and logging
// (well, only logging as of now)
// Note: don't put in static initializer (programID not set yet)
static class PersistentMap<A, B> extends AbstractMap<A, B> {
  Map<A, B> m = new HashMap<A, B>();
  File file;
  String id; // unique ID of this map
  
  PersistentMap(String fileName) {
    this(getProgramFile(fileName));
  }
  
  PersistentMap(String progID, String fileName) {
    this(getProgramFile(progID, fileName));
  }
  
  PersistentMap(File file) {
  this.file = file;
    for (String s : scanLog(file)) try { 
      List l = (List) ( unstructure(s));
      Object cmd = l.get(0);
      if (eq(cmd, "add"))
        m.put((A) l.get(1), (B) l.get(2));
      else if (eq(cmd, "remove"))
        m.remove((A) l.get(1));
      else if (eq(cmd, "id"))
        id = (String) l.get(1);
      else
        print("Unknown command in log: " + l.get(0));
    } catch (Throwable __e) { printStackTrace(__e); }
    
    if (id == null) {
      id = makeRandomID(12);
      logQuoted(file, structure(litlist("id", id)));
    }
  }
  
  // just delegates
  
  public int size() {
    return m.size();
  }
  
  public B get(Object a) {
    return m.get(a);
  }
  
  // TODO: calling remove() in the iterator will have unpersisted
  // effects.
  public Set<Map.Entry<A,B>> entrySet() {
    return m.entrySet();
  }
  
  // delegates with logging

  public B put(A a, B b) {
    B c = m.get(a);
    if (neq(b, c)) {
      m.put(a, b);
      logQuoted(file, structure(litlist("add", a, b)));
    }
    return c;
  }
  
  public B remove(Object a) {
    B result = m.remove(a);
    logQuoted(file, structure(litlist("remove", a)));
    return result;
  }
  
  // unique id of this map
  public String id() {
    return id;
  }
}

static boolean neq(Object a, Object b) {
  return !eq(a, b);
}
static void printStackTrace(Throwable e) {
  // we go to system.out now - system.err is nonsense
  print(getStackTrace(e));
}

static void printStackTrace() {
  printStackTrace(new Throwable());
}
static class DynamicObject {
  String className;
  Map<String, Object> fieldValues = new TreeMap<String, Object>();
}

static Object unstructure(String text) {
  return unstructure(text, false);
}

// TODO: backrefs for hashmap{} etc
static Object unstructure(String text, final boolean allDynamic) {
  final List<String> tok = javaTok(text);
  final boolean debug = false;
  
  class X {
    int i = 1;
    HashMap<Integer, Object> refs = new HashMap<Integer, Object>();

    Object parse() {
      String t = tok.get(i);
      
      int refID = 0;
      if (t.startsWith("m") && isInteger(t.substring(1))) {
        refID = parseInt(t.substring(1));
        i += 2;
        t = tok.get(i);
      }
      
      if (debug)
        print("parse: " + quote(t));
        
      if (t.startsWith("\"")) {
        String s = unquote(tok.get(i));
        i += 2;
        return s;
      }
      if (t.equals("bigint"))
        return parseBigInt();
      if (t.equals("d"))
        return parseDouble();
      if (t.equals("false")) {
        i += 2; return false;
      }
      if (t.equals("true")) {
        i += 2; return true;
      }
      if (t.equals("-")) {
        t = tok.get(i+2);
        i += 4;
        t = dropSuffix("L", t);
        long l = -Long.parseLong(t);
        return l == (int) l ? (int) l : l;
      }
      if (isInteger(t) || isLongConstant(t)) {
        i += 2;
        t = dropSuffix("L", t);
        long l = Long.parseLong(t);
        return l == (int) l ? (int) l : l;
      }
      
      if (t.startsWith("r") && isInteger(t.substring(1))) {
        i += 2;
        int ref = Integer.parseInt(t.substring(1));
        Object o = refs.get(ref);
        if (o == null)
          print("Warning: unsatisfied back reference " + ref);
        return o;
      }
      
      return parse_inner(refID);
    }
    
    // everything that can be backreferenced
    Object parse_inner(int refID) {
      String t = tok.get(i);
      
      if (debug)
        print("parse_inner: " + quote(t));
        
      if (t.equals("hashset"))
        return parseHashSet();
      if (t.equals("treeset"))
        return parseTreeSet();
      if (t.equals("hashmap"))
        return parseHashMap();
      if (t.equals("{"))
        return parseMap();
      if (t.equals("["))
        return parseList();
      if (t.equals("array"))
        return parseArray();
      if (t.equals("class"))
        return parseClass();
      if (t.equals("l"))
        return parseLisp();
      if (t.equals("null")) {
        i += 2; return null;
      }
      if (isJavaIdentifier(t)) {
        Class c = allDynamic ? null : findClass(t);
        DynamicObject dO = null;
        Object o = null;
        if (c != null)
          o = nuObject(c);
        else {
          dO = new DynamicObject();
          dO.className = t;
        }
        
        if (refID != 0)
          refs.put(refID, o);
          
        i += 2;
        if (i < tok.size() && tok.get(i).equals("(")) {
          consume("(");
          while (!tok.get(i).equals(")")) {
            // It's like parsing a map.
            //Object key = parse();
            //if (tok.get(i).equals(")"))
            //  key = onlyField();
            String key = unquote(tok.get(i));
            i += 2;
            consume("=");
            Object value = parse();
            if (o != null)
              setOpt(o, key, value);
            else
              dO.fieldValues.put(key, value);
            if (tok.get(i).equals(",")) i += 2;
          }
          consume(")");
        }
        return o != null ? o : dO;
      }
      throw new RuntimeException("Unknown token " + (i+1) + ": " + t);
    }
    
    Object parseSet(Set set) {
      set.addAll((List) parseList());
      return set;
    }
    
    Object parseLisp() {
      consume("l");
      consume("(");
      List list = new ArrayList();
      while (!tok.get(i).equals(")")) {
        list.add(parse());
        if (tok.get(i).equals(",")) i += 2;
      }
      consume(")");
      return newObject("main$Lisp", (String) list.get(0), subList(list, 1));
    }
    
    Object parseList() {
      consume("[");
      List list = new ArrayList();
      while (!tok.get(i).equals("]")) {
        list.add(parse());
        if (tok.get(i).equals(",")) i += 2;
      }
      consume("]");
      return list;
    }
    
    Object parseArray() {
      consume("array");
      consume("{");
      List list = new ArrayList();
      while (!tok.get(i).equals("}")) {
        list.add(parse());
        if (tok.get(i).equals(",")) i += 2;
      }
      consume("}");
      return list.toArray();
    }
    
    Object parseClass() {
      consume("class");
      consume("(");
      String name = tok.get(i);
      i += 2;
      consume(")");
      Class c = allDynamic ? null : findClass(name);
      if (c != null) return c;
      DynamicObject dO = new DynamicObject();
      dO.className = "java.lang.Class";
      dO.fieldValues.put("name", name);
      return dO;
    }
    
    Object parseBigInt() {
      consume("bigint");
      consume("(");
      String val = tok.get(i);
      i += 2;
      if (eq(val, "-")) {
        val = "-" + tok.get(i);
        i += 2;
      }
      consume(")");
      return new BigInteger(val);
    }
    
    Object parseDouble() {
      consume("d");
      consume("(");
      String val = unquote(tok.get(i));
      i += 2;
      consume(")");
      return Double.parseDouble(val);
    }
    
    Object parseHashMap() {
      consume("hashmap");
      return parseMap(new HashMap());
    }
    
    Object parseHashSet() {
      consume("hashset");
      return parseSet(new HashSet());
    }
    
    Object parseTreeSet() {
      consume("treeset");
      return parseSet(new TreeSet());
    }
    
    Object parseMap() {
      return parseMap(new TreeMap());
    }
    
    Object parseMap(Map map) {
      consume("{");
      while (!tok.get(i).equals("}")) {
        Object key = parse();
        consume("=");
        Object value = parse();
        map.put(key, value);
        if (tok.get(i).equals(",")) i += 2;
      }
      consume("}");
      return map;
    }
    
    void consume(String s) {
      if (!tok.get(i).equals(s)) {
        String prevToken = i-2 >= 0 ? tok.get(i-2) : "";
        String nextTokens = join(tok.subList(i, Math.min(i+4, tok.size())));
        fail(quote(s) + " expected: " + prevToken + " " + nextTokens + " (" + i + "/" + tok.size() + ")");
      }
      i += 2;
    }
  }
  
  return new X().parse();
}
static void logQuoted(String logFile, String line) {
  logQuoted(getProgramFile(logFile), line);
}

static void logQuoted(File logFile, String line) {
  appendToFile(logFile, quote(line) + "\n");
}
static File getProgramFile(String progID, String fileName) {
  return new File(getProgramDir(progID), fileName);
}

static File getProgramFile(String fileName) {
  return getProgramFile(getProgramID(), fileName);
}

static List<String> scanLog(String progID, String fileName) {
  return scanLog(getProgramFile(progID, fileName));
}

static List<String> scanLog(String fileName) {
  return scanLog(getProgramFile(fileName));
}

static List<String> scanLog(File file) {
  List<String> l = new ArrayList<String>();
  for (String s : toLines(file))
    if (isQuoted(s))
      l.add(unquote(s));
  return l;
}
  public static String loadTextFile(String fileName) {
    try {
      return loadTextFile(fileName, null);
    } catch (IOException e) {
      throw new RuntimeException(e);
    }
  }
  
  public static String loadTextFile(String fileName, String defaultContents) throws IOException {
    if (!new File(fileName).exists())
      return defaultContents;

    FileInputStream fileInputStream = new FileInputStream(fileName);
    InputStreamReader inputStreamReader = new InputStreamReader(fileInputStream, "UTF-8");
    return loadTextFile(inputStreamReader);
  }
  
  public static String loadTextFile(File fileName) {
    try {
      return loadTextFile(fileName, null);
    } catch (IOException e) {
      throw new RuntimeException(e);
    }
  }

  public static String loadTextFile(File fileName, String defaultContents) throws IOException {
    try {
      return loadTextFile(fileName.getPath(), defaultContents);
    } catch (IOException e) {
      throw new RuntimeException(e);
    }
  }
  
  public static String loadTextFile(Reader reader) throws IOException {
    StringBuilder builder = new StringBuilder();
    try {
      char[] buffer = new char[1024];
      int n;
      while (-1 != (n = reader.read(buffer)))
        builder.append(buffer, 0, n);
        
    } finally {
      reader.close();
    }
    return builder.toString();
  }
static String makeRandomID(int length) {
  Random random = new Random();
  char[] id = new char[length];
  for (int i = 0; i < id.length; i++)
    id[i] = (char) ((int) 'a' + random.nextInt(26));
  return new String(id);
}

static String getStackTrace(Throwable throwable) {
  StringWriter writer = new StringWriter();
  throwable.printStackTrace(new PrintWriter(writer));
  return writer.toString();
}
 // Let's just generally synchronize this to be safe.
 static synchronized void appendToFile(String path, String s) { try {
 
    new File(path).getParentFile().mkdirs();
    //print("[Logging to " + path + "]");
    Writer writer = new BufferedWriter(new OutputStreamWriter(
      new FileOutputStream(path, true), "UTF-8"));
    writer.write(s);
    writer.close();
  
} catch (Throwable __e) { throw __e instanceof RuntimeException ? (RuntimeException) __e : new RuntimeException(__e); }}
  
  static void appendToFile(File path, String s) {
    appendToFile(path.getPath(), s);
  }

// supports the usual quotings (', ", variable length double brackets)
static boolean isQuoted(String s) {
  if (s.startsWith("'") || s.startsWith("\"")) return true;
  if (!s.startsWith("[")) return false;
  int i = 1;
  while (i < s.length() && s.charAt(i) == '=') ++i;
  return i < s.length() && s.charAt(i) == '[';
  //return Pattern.compile("^\\[=*\\[").matcher(s).find();
}
// currently finds only inner classes of class "main"
// returns null on not found
// this is the simple version that is not case-tolerant
static Class findClass(String name) {
  try {
    return Class.forName("main$" + name);
  } catch (ClassNotFoundException e) {
    return null;
  }
}
static String programID;

static String getProgramID() {
  return programID;
}

// TODO: ask JavaX instead
static String getProgramID(Class c) {
  return or((String) getOpt(c, "programID"), "?");
}

static String getProgramID(Object o) {
  return getProgramID(getMainClass(o));
}
static double parseDouble(String s) {
  return Double.parseDouble(s);
}
static Object newObject(Class c, Object... args) {
  return nuObject(c, args);
}

static Object newObject(String className, Object... args) {
  return nuObject(className, args);
}

static boolean isLongConstant(String s) {
  if (!s.endsWith("L")) return false;
  s = s.substring(0, l(s)-1);
  return isInteger(s);
}
static List<String> toLines(File f) {
  return toLines(loadTextFile(f));
}

  public static List<String> toLines(String s) {
    List<String> lines = new ArrayList<String>();
    if (s == null) return lines;
    int start = 0;
    while (true) {
      int i = toLines_nextLineBreak(s, start);
      if (i < 0) {
        if (s.length() > start) lines.add(s.substring(start));
        break;
      }

      lines.add(s.substring(start, i));
      if (s.charAt(i) == '\r' && i+1 < s.length() && s.charAt(i+1) == '\n')
        i += 2;
      else
        ++i;

      start = i;
    }
    return lines;
  }

  private static int toLines_nextLineBreak(String s, int start) {
    for (int i = start; i < s.length(); i++) {
      char c = s.charAt(i);
      if (c == '\r' || c == '\n')
        return i;
    }
    return -1;
  }
  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.endsWith("\"") ? s.length()-1 : s.length());
      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;
          default:
            ch = nextChar; // added by Stefan
          }
          i++;
        }
        sb.append(ch);
      }
      return sb.toString();      
    } else
      return s; // return original
  }
static <A> List<A> subList(List<A> l, int startIndex) {
  return subList(l, startIndex, l(l));
}

static <A> List<A> subList(List<A> l, int startIndex, int endIndex) {
  startIndex = max(0, min(l(l), startIndex));
  endIndex = max(0, min(l(l), endIndex));
  if (startIndex > endIndex) return litlist();
  return l.subList(startIndex, endIndex);
}
static String dropSuffix(String suffix, String s) {
  return s.endsWith(suffix) ? s.substring(0, l(s)-l(suffix)) : s;
}
static File getProgramDir() {
  return programDir();
}

static File getProgramDir(String snippetID) {
  return programDir(snippetID);
}
  static void setOpt(Object o, String field, Object value) {
    if (o instanceof Class) setOpt((Class) o, field, value);
    else try {
      Field f = setOpt_findField(o.getClass(), field);
      if (f != null)
        smartSet(f, o, value);
    } catch (Exception e) {
      throw new RuntimeException(e);
    }
  }
  
  static void setOpt(Class c, String field, Object value) {
    try {
      Field f = setOpt_findStaticField(c, field);
      if (f != null)
        smartSet(f, null, value);
    } catch (Exception e) {
      throw new RuntimeException(e);
    }
  }
  
  static Field setOpt_findField(Class<?> c, String field) {
    for (Field f : c.getDeclaredFields())
      if (f.getName().equals(field))
        return f;
    return null;
  }
  
  static Field setOpt_findStaticField(Class<?> c, String field) {
    for (Field f : c.getDeclaredFields())
      if (f.getName().equals(field) && (f.getModifiers() & Modifier.STATIC) != 0)
        return f;
    return null;
  }

static File programDir() {
  return programDir(getProgramID());
}

static File programDir(String snippetID) {
  return new File(javaxDataDir(), formatSnippetID(snippetID));
}

static int min(int a, int b) {
  return Math.min(a, b);
}

static double min(double[] c) {
  double x = Double.MAX_VALUE;
  for (double d : c) x = Math.min(x, d);
  return x;
}

static Class getMainClass() { try {
 
  return Class.forName("main");

} catch (Throwable __e) { throw __e instanceof RuntimeException ? (RuntimeException) __e : new RuntimeException(__e); }}

static Class getMainClass(Object o) { try {
 
  return (o instanceof Class ? (Class) o : o.getClass()).getClassLoader().loadClass("main");

} catch (Throwable __e) { throw __e instanceof RuntimeException ? (RuntimeException) __e : new RuntimeException(__e); }}
static <A> A or(A a, A b) {
  return a != null ? a : b;
}
static int max(int a, int b) {
  return Math.max(a, b);
}

static long max(int a, long b) {
  return Math.max((long) a, b);
}

static long max(long a, long b) {
  return Math.max(a, b);
}

static double max(int a, double b) {
  return Math.max((double) a, b);
}

static int max(Collection<Integer> c) {
  int x = Integer.MIN_VALUE;
  for (int i : c) x = max(x, i);
  return x;
}

static double max(double[] c) {
  if (c.length == 0) return Double.MIN_VALUE;
  double x = c[0];
  for (int i = 1; i < c.length; i++) x = Math.max(x, c[i]);
  return x;
}

static void smartSet(Field f, Object o, Object value) throws Exception {
  f.setAccessible(true);
  
  // take care of common case (long to int)
  if (f.getType() == int.class && value instanceof Long)
    value = ((Long) value).intValue();
    
  f.set(o, value);
}

static String formatSnippetID(String id) {
  return "#" + parseSnippetID(id);
}

static String formatSnippetID(long id) {
  return "#" + id;
}
static File javaxDataDir_dir; // can be set to work on different base dir

static File javaxDataDir() {
  return javaxDataDir_dir != null ? javaxDataDir_dir : new File(userHome(), "JavaX-Data");
}

public static long parseSnippetID(String snippetID) {
  long id = Long.parseLong(shortenSnippetID(snippetID));
  if (id == 0) fail("0 is not a snippet ID");
  return id;
}
static String _userHome;
static String userHome() {
  if (_userHome == null) {
    if (isAndroid())
      _userHome = "/storage/sdcard0/";
    else
      _userHome = System.getProperty("user.home");
    //System.out.println("userHome: " + _userHome);
  }
  return _userHome;
}


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 "" + parseLong(snippetID);
}
static boolean isAndroid() { return System.getProperty("java.vendor").toLowerCase().indexOf("android") >= 0; }

static long parseLong(String s) {
  return Long.parseLong(s);
}
}