/*
*******************************************************************************
*
*   Copyright (C) 2001-2003, International Business Machines
*   Corporation and others.  All Rights Reserved.
*
*******************************************************************************
*   file name:  ucol_tok.cpp
*   encoding:   US-ASCII
*   tab size:   8 (not used)
*   indentation:4
*
*   created 02/22/2001
*   created by: Vladimir Weinstein
*
* This module reads a tailoring rule string and produces a list of 
* tokens that will be turned into collation elements
* 
*/

#include "unicode/utypes.h"

#if !UCONFIG_NO_COLLATION

#include "unicode/ustring.h"
#include "unicode/uchar.h"
#include "unicode/uniset.h"
 
#include "ucol_tok.h"
#include "cmemory.h"
#include "uprops.h"

U_CDECL_BEGIN
static int32_t U_EXPORT2 U_CALLCONV
uhash_hashTokens(const UHashTok k)
{
    int32_t hash = 0;
    //uint32_t key = (uint32_t)k.integer;
    UColToken *key = (UColToken *)k.pointer;
    if (key != 0) {
        //int32_t len = (key & 0xFF000000)>>24;
        int32_t len = (key->source & 0xFF000000)>>24;
        int32_t inc = ((len - 32) / 32) + 1;
        
        //const UChar *p = (key & 0x00FFFFFF) + rulesToParse;
        const UChar *p = (key->source & 0x00FFFFFF) + key->rulesToParse;
        const UChar *limit = p + len;    

        while (p<limit) {
            hash = (hash * 37) + *p;
            p += inc;
        }
    }
    return hash;
}

static UBool U_EXPORT2 U_CALLCONV
uhash_compareTokens(const UHashTok key1, const UHashTok key2)
{
    //uint32_t p1 = (uint32_t) key1.integer;
    //uint32_t p2 = (uint32_t) key2.integer;
    UColToken *p1 = (UColToken *)key1.pointer;
    UColToken *p2 = (UColToken *)key2.pointer;
    const UChar *s1 = (p1->source & 0x00FFFFFF) + p1->rulesToParse;
    const UChar *s2 = (p2->source & 0x00FFFFFF) + p2->rulesToParse;
    uint32_t s1L = ((p1->source & 0xFF000000) >> 24);
    uint32_t s2L = ((p2->source & 0xFF000000) >> 24);
    const UChar *end = s1+s1L-1;

    if (p1 == p2) {
        return TRUE;
    }
    if (p1->source == 0 || p2->source == 0) {
        return FALSE;
    }
    if(s1L != s2L) {
      return FALSE;
    }
    if(p1->source == p2->source) {
      return TRUE;
    }
    while((s1 < end) && *s1 == *s2) {
      ++s1;
      ++s2;
    }
    if(*s1 == *s2) {
      return TRUE;
    } else {
      return FALSE;
    }
}
U_CDECL_END

static inline void U_CALLCONV
uhash_freeBlockWrapper(void *obj) {
  uhash_freeBlock(obj);
}


typedef struct {
  uint32_t startCE;
  uint32_t startContCE;
  uint32_t limitCE;
  uint32_t limitContCE;
} indirectBoundaries;

/* these values are used for finding CE values for indirect positioning. */
/* Indirect positioning is a mechanism for allowing resets on symbolic   */
/* values. It only works for resets and you cannot tailor indirect names */
/* An indirect name can define either an anchor point or a range. An     */
/* anchor point behaves in exactly the same way as a code point in reset */
/* would, except that it cannot be tailored. A range (we currently only  */
/* know for the [top] range will explicitly set the upper bound for      */
/* generated CEs, thus allowing for better control over how many CEs can */
/* be squeezed between in the range without performance penalty.         */
/* In that respect, we use [top] for tailoring of locales that use CJK   */
/* characters. Other indirect values are currently a pure convenience,   */
/* they can be used to assure that the CEs will be always positioned in  */
/* the same place relative to a point with known properties (e.g. first  */
/* primary ignorable). */
static indirectBoundaries ucolIndirectBoundaries[15];
/*
static indirectBoundaries ucolIndirectBoundaries[11] = {
  { UCOL_RESET_TOP_VALUE,               0, 
    UCOL_NEXT_TOP_VALUE,                0 },
  { UCOL_FIRST_PRIMARY_IGNORABLE,       0, 
    0,                                  0 },
  { UCOL_LAST_PRIMARY_IGNORABLE,        UCOL_LAST_PRIMARY_IGNORABLE_CONT, 
    0,                                  0 },
  { UCOL_FIRST_SECONDARY_IGNORABLE,     0, 
    0,                                  0 },
  { UCOL_LAST_SECONDARY_IGNORABLE,      0, 
    0,                                  0 },
  { UCOL_FIRST_TERTIARY_IGNORABLE,      0, 
    0,                                  0 },
  { UCOL_LAST_TERTIARY_IGNORABLE,       0, 
    0,                                  0 },
  { UCOL_FIRST_VARIABLE,                0, 
    0,                                  0 },
  { UCOL_LAST_VARIABLE,                 0, 
    0,                                  0 },
  { UCOL_FIRST_NON_VARIABLE,            0, 
    0,                                  0 },
  { UCOL_LAST_NON_VARIABLE,             0, 
    0,                                  0 },
};
*/

static void setIndirectBoundaries(uint32_t indexR, uint32_t *start, uint32_t *end) { 
  
  // Set values for the top - TODO: once we have values for all the indirects, we are going
  // to initalize here.
  ucolIndirectBoundaries[indexR].startCE = start[0];
  ucolIndirectBoundaries[indexR].startContCE = start[1];
  if(end) {
    ucolIndirectBoundaries[indexR].limitCE = end[0];
    ucolIndirectBoundaries[indexR].limitContCE = end[1];
  } else {
    ucolIndirectBoundaries[indexR].limitCE = 0;
    ucolIndirectBoundaries[indexR].limitContCE = 0;
  }
}


static inline 
void syntaxError(const UChar* rules, 
                 int32_t pos,
                 int32_t rulesLen,
                 UParseError* parseError) {
    parseError->offset = pos;
    parseError->line = 0 ; /* we are not using line numbers */
    
    // for pre-context
    int32_t start = (pos <=U_PARSE_CONTEXT_LEN)? 0 : (pos - (U_PARSE_CONTEXT_LEN-1));
    int32_t stop  = pos;
    
    u_memcpy(parseError->preContext,rules+start,stop-start);
    //null terminate the buffer
    parseError->preContext[stop-start] = 0;
    
    //for post-context
    start = pos+1;
    stop  = ((pos+U_PARSE_CONTEXT_LEN)<= rulesLen )? (pos+(U_PARSE_CONTEXT_LEN-1)) : 
                                                            rulesLen;

    u_memcpy(parseError->postContext,rules+start,stop-start);
    //null terminate the buffer
    parseError->postContext[stop-start]= 0;
}

static
void ucol_uprv_tok_setOptionInImage(UColOptionSet *opts, UColAttribute attrib, UColAttributeValue value) {
  switch(attrib) {
  case UCOL_HIRAGANA_QUATERNARY_MODE:
    opts->hiraganaQ = value;
    break;
  case UCOL_FRENCH_COLLATION:
    opts->frenchCollation = value;
    break;
  case UCOL_ALTERNATE_HANDLING:
    opts->alternateHandling = value;
    break;
  case UCOL_CASE_FIRST:
    opts->caseFirst = value;
    break;
  case UCOL_CASE_LEVEL:
    opts->caseLevel = value;
    break;
  case UCOL_NORMALIZATION_MODE:
    opts->normalizationMode = value;
    break;
  case UCOL_STRENGTH:
    opts->strength = value;
    break;
  case UCOL_ATTRIBUTE_COUNT:
  default:
    break;
  }
}

#define UTOK_OPTION_COUNT 19

static UBool didInit = FALSE;
/* we can be strict, or we can be lenient */
/* I'd surely be lenient with the option arguments */
/* maybe even with options */
U_STRING_DECL(suboption_00, "non-ignorable", 13);
U_STRING_DECL(suboption_01, "shifted",        7);

U_STRING_DECL(suboption_02, "lower",          5);
U_STRING_DECL(suboption_03, "upper",          5);
U_STRING_DECL(suboption_04, "off",            3);
U_STRING_DECL(suboption_05, "on",             2);
U_STRING_DECL(suboption_06, "1",              1);
U_STRING_DECL(suboption_07, "2",              1);
U_STRING_DECL(suboption_08, "3",              1);
U_STRING_DECL(suboption_09, "4",              1);
U_STRING_DECL(suboption_10, "I",              1);

U_STRING_DECL(suboption_11, "primary",        7);
U_STRING_DECL(suboption_12, "secondary",      9);
U_STRING_DECL(suboption_13, "tertiary",       8);
U_STRING_DECL(suboption_14, "variable",       8);
U_STRING_DECL(suboption_15, "regular",        7);
U_STRING_DECL(suboption_16, "implicit",       8);
U_STRING_DECL(suboption_17, "trailing",       8);


U_STRING_DECL(option_00,    "undefined",      9);
U_STRING_DECL(option_01,    "rearrange",      9);  
U_STRING_DECL(option_02,    "alternate",      9);
U_STRING_DECL(option_03,    "backwards",      9);  
U_STRING_DECL(option_04,    "variable top",  12); 
U_STRING_DECL(option_05,    "top",            3);  
U_STRING_DECL(option_06,    "normalization", 13); 
U_STRING_DECL(option_07,    "caseLevel",      9);  
U_STRING_DECL(option_08,    "caseFirst",      9); 
U_STRING_DECL(option_09,    "scriptOrder",   11);  
U_STRING_DECL(option_10,    "charsetname",   11); 
U_STRING_DECL(option_11,    "charset",        7);  
U_STRING_DECL(option_12,    "before",         6);  
U_STRING_DECL(option_13,    "hiraganaQ",      9);
U_STRING_DECL(option_14,    "strength",       8);
U_STRING_DECL(option_15,    "first",          5);
U_STRING_DECL(option_16,    "last",           4);
U_STRING_DECL(option_17,    "optimize",       8);
U_STRING_DECL(option_18,    "suppressContractions",         20);


/*
[last variable] last variable value 
[last primary ignorable] largest CE for primary ignorable 
[last secondary ignorable] largest CE for secondary ignorable 
[last tertiary ignorable] largest CE for tertiary ignorable 
[top] guaranteed to be above all implicit CEs, for now and in the future (in 1.8) 
*/


static const ucolTokSuboption alternateSub[2] = {
  {suboption_00, 13, UCOL_NON_IGNORABLE},
  {suboption_01,  7, UCOL_SHIFTED}
};

static const ucolTokSuboption caseFirstSub[3] = {
  {suboption_02, 5, UCOL_LOWER_FIRST},
  {suboption_03,  5, UCOL_UPPER_FIRST},
  {suboption_04,  3, UCOL_OFF},
};

static const ucolTokSuboption onOffSub[2] = {
  {suboption_04, 3, UCOL_OFF},
  {suboption_05, 2, UCOL_ON}
};

static const ucolTokSuboption frenchSub[1] = {
  {suboption_07, 1, UCOL_ON}
};

static const ucolTokSuboption beforeSub[3] = {
  {suboption_06, 1, UCOL_PRIMARY},
  {suboption_07, 1, UCOL_SECONDARY},
  {suboption_08, 1, UCOL_TERTIARY}
};

static const ucolTokSuboption strengthSub[5] = {
  {suboption_06, 1, UCOL_PRIMARY},
  {suboption_07, 1, UCOL_SECONDARY},
  {suboption_08, 1, UCOL_TERTIARY},
  {suboption_09, 1, UCOL_QUATERNARY},
  {suboption_10, 1, UCOL_IDENTICAL},
};

static const ucolTokSuboption firstLastSub[7] = {
  {suboption_11, 7, UCOL_PRIMARY},
  {suboption_12, 9, UCOL_PRIMARY},
  {suboption_13, 8, UCOL_PRIMARY},
  {suboption_14, 8, UCOL_PRIMARY},
  {suboption_15, 7, UCOL_PRIMARY},
  {suboption_16, 8, UCOL_PRIMARY},
  {suboption_17, 8, UCOL_PRIMARY},
};

static const ucolTokOption rulesOptions[UTOK_OPTION_COUNT] = {
 /*00*/ {option_02,  9, alternateSub, 2, UCOL_ALTERNATE_HANDLING}, /*"alternate" */
 /*01*/ {option_03,  9, frenchSub, 1, UCOL_FRENCH_COLLATION}, /*"backwards"      */
 /*02*/ {option_07,  9, onOffSub, 2, UCOL_CASE_LEVEL},  /*"caseLevel"      */
 /*03*/ {option_08,  9, caseFirstSub, 3, UCOL_CASE_FIRST}, /*"caseFirst"   */
 /*04*/ {option_06, 13, onOffSub, 2, UCOL_NORMALIZATION_MODE}, /*"normalization" */
 /*05*/ {option_13, 9, onOffSub, 2, UCOL_HIRAGANA_QUATERNARY_MODE}, /*"hiraganaQ" */
 /*06*/ {option_14, 8, strengthSub, 5, UCOL_STRENGTH}, /*"strength" */
 /*07*/ {option_04, 12, NULL, 0, UCOL_ATTRIBUTE_COUNT}, /*"variable top"   */
 /*08*/ {option_01,  9, NULL, 0, UCOL_ATTRIBUTE_COUNT}, /*"rearrange"      */
 /*09*/ {option_12,  6, beforeSub, 3, UCOL_ATTRIBUTE_COUNT}, /*"before"    */
 /*10*/ {option_05,  3, NULL, 0, UCOL_ATTRIBUTE_COUNT}, /*"top"            */
 /*11*/ {option_15,  5, firstLastSub, 7, UCOL_ATTRIBUTE_COUNT}, /*"first" */
 /*12*/ {option_16,  4, firstLastSub, 7, UCOL_ATTRIBUTE_COUNT}, /*"last" */
 /*13*/ {option_17,  8, NULL, 0, UCOL_ATTRIBUTE_COUNT}, /*"optimize"      */
 /*14*/ {option_18, 20, NULL, 0, UCOL_ATTRIBUTE_COUNT}, /*"suppressContractions"      */
 /*15*/ {option_00,  9, NULL, 0, UCOL_ATTRIBUTE_COUNT}, /*"undefined"      */
 /*16*/ {option_09, 11, NULL, 0, UCOL_ATTRIBUTE_COUNT}, /*"scriptOrder"    */
 /*17*/ {option_10, 11, NULL, 0, UCOL_ATTRIBUTE_COUNT}, /*"charsetname"    */
 /*18*/ {option_11,  7, NULL, 0, UCOL_ATTRIBUTE_COUNT}  /*"charset"        */
};

static
int32_t u_strncmpNoCase(const UChar     *s1, 
     const UChar     *s2, 
     int32_t     n) 
{
    if(n > 0) {
        int32_t rc;
        for(;;) {
            rc = (int32_t)u_tolower(*s1) - (int32_t)u_tolower(*s2);
            if(rc != 0 || *s1 == 0 || --n == 0) {
                return rc;
            }
            ++s1;
            ++s2;
        }
    }
    return 0;
}

static
void ucol_uprv_tok_initData() {
  if(!didInit) {
    U_STRING_INIT(suboption_00, "non-ignorable", 13);
    U_STRING_INIT(suboption_01, "shifted",        7);

    U_STRING_INIT(suboption_02, "lower",          5);
    U_STRING_INIT(suboption_03, "upper",          5);
    U_STRING_INIT(suboption_04, "off",            3);
    U_STRING_INIT(suboption_05, "on",             2);

    U_STRING_INIT(suboption_06, "1",              1);
    U_STRING_INIT(suboption_07, "2",              1);
    U_STRING_INIT(suboption_08, "3",              1);
    U_STRING_INIT(suboption_09, "4",              1);
    U_STRING_INIT(suboption_10, "I",              1);

    U_STRING_INIT(suboption_11, "primary",        7);
    U_STRING_INIT(suboption_12, "secondary",      9);
    U_STRING_INIT(suboption_13, "tertiary",       8);
    U_STRING_INIT(suboption_14, "variable",       8);
    U_STRING_INIT(suboption_15, "regular",        7);
    U_STRING_INIT(suboption_16, "implicit",       8);
    U_STRING_INIT(suboption_17, "trailing",       8);


    U_STRING_INIT(option_00, "undefined",      9);
    U_STRING_INIT(option_01, "rearrange",      9);  
    U_STRING_INIT(option_02, "alternate",      9);
    U_STRING_INIT(option_03, "backwards",      9);  
    U_STRING_INIT(option_04, "variable top",  12); 
    U_STRING_INIT(option_05, "top",            3);  
    U_STRING_INIT(option_06, "normalization", 13); 
    U_STRING_INIT(option_07, "caseLevel",      9);  
    U_STRING_INIT(option_08, "caseFirst",      9); 
    U_STRING_INIT(option_09, "scriptOrder",   11);  
    U_STRING_INIT(option_10, "charsetname",   11); 
    U_STRING_INIT(option_11, "charset",        7);  
    U_STRING_INIT(option_12, "before",         6);  
    U_STRING_INIT(option_13, "hiraganaQ",      9);
    U_STRING_INIT(option_14, "strength",       8);
    U_STRING_INIT(option_15, "first",          5);
    U_STRING_INIT(option_16, "last",           4);
    U_STRING_INIT(option_17, "optimize",       8);
    U_STRING_INIT(option_18, "suppressContractions",         20);
    didInit = TRUE;
  }
}


// This function reads basic options to set in the runtime collator
// used by data driven tests. Should not support build time options
U_CAPI const UChar * U_EXPORT2
ucol_tok_getNextArgument(const UChar *start, const UChar *end, 
                               UColAttribute *attrib, UColAttributeValue *value, 
                               UErrorCode *status) {
  uint32_t i = 0;
  int32_t j=0;
  UBool foundOption = FALSE;
  const UChar *optionArg = NULL;

  ucol_uprv_tok_initData();

  while(start < end && u_isWhitespace(*start)) { /* eat whitespace */
    start++;
  }
  if(start >= end) {
    return NULL;
  }
  /* skip opening '[' */
  if(*start == 0x005b) {
    start++;
  } else {
    *status = U_ILLEGAL_ARGUMENT_ERROR; // no opening '['
    return NULL;
  }

  while(i < UTOK_OPTION_COUNT) {
    if(u_strncmpNoCase(start, rulesOptions[i].optionName, rulesOptions[i].optionLen) == 0) {
      foundOption = TRUE;
      if(end - start > rulesOptions[i].optionLen) {
        optionArg = start+rulesOptions[i].optionLen+1; /* start of the options, skip space */
        while(u_isWhitespace(*optionArg)) { /* eat whitespace */
          optionArg++;
        }
      }     
      break;
    }
    i++;
  }

  if(!foundOption) {
    *status = U_ILLEGAL_ARGUMENT_ERROR;
    return NULL;
  }

  if(optionArg) {
    for(j = 0; j<rulesOptions[i].subSize; j++) {
      if(u_strncmpNoCase(optionArg, rulesOptions[i].subopts[j].subName, rulesOptions[i].subopts[j].subLen) == 0) {
        //ucol_uprv_tok_setOptionInImage(src->opts, rulesOptions[i].attr, rulesOptions[i].subopts[j].attrVal);
        *attrib = rulesOptions[i].attr;
        *value = rulesOptions[i].subopts[j].attrVal;
        optionArg += rulesOptions[i].subopts[j].subLen;
        while(u_isWhitespace(*optionArg)) { /* eat whitespace */
          optionArg++;
        }
        if(*optionArg == 0x005d) {
          optionArg++;
          return optionArg;
        } else {
          *status = U_ILLEGAL_ARGUMENT_ERROR;
          return NULL;
        }
      }
    }
  }
  *status = U_ILLEGAL_ARGUMENT_ERROR;
  return NULL;
}

static 
USet *ucol_uprv_tok_readAndSetUnicodeSet(const UChar *start, const UChar *end, UErrorCode *status) {
  while(*start != 0x005b) { /* advance while we find the first '[' */
    start++;
  }
  // now we need to get a balanced set of '[]'. The problem is that a set can have 
  // many, and *end point to the first closing '['
  int32_t noOpenBraces = 1;
  int32_t current = 1; // skip the opening brace
  while(start+current < end && noOpenBraces != 0) {
    if(start[current] == 0x005b) {
      noOpenBraces++;
    } else if(start[current] == 0x005D) { // closing brace
      noOpenBraces--;
    }
    current++;
  }
  UChar *nextBrace = NULL;

  if(noOpenBraces != 0 || (nextBrace = u_strchr(start+current, 0x005d /*']'*/)) == NULL) {
    *status = U_ILLEGAL_ARGUMENT_ERROR;
    return NULL;
  }
  return uset_openPattern(start, current, status);
}

static
int32_t ucol_uprv_tok_readOption(const UChar *start, const UChar *end, const UChar **optionArg) {
  int32_t i = 0;
  while(u_isWhitespace(*start)) { /* eat whitespace */
    start++;
  }
  while(i < UTOK_OPTION_COUNT) {
    if(u_strncmpNoCase(start, rulesOptions[i].optionName, rulesOptions[i].optionLen) == 0) {
      if(end - start > rulesOptions[i].optionLen) {
        *optionArg = start+rulesOptions[i].optionLen; /* start of the options*/
        while(u_isWhitespace(**optionArg)) { /* eat whitespace */
          (*optionArg)++;
        }
      }     
      break;
    }
    i++;
  }
  if(i == UTOK_OPTION_COUNT) {
    i = -1; // didn't find an option
  } 
  return i;
}


// reads and conforms to various options in rules
// end is the position of the first closing ']'
// However, some of the options take an UnicodeSet definition
// which needs to duplicate the closing ']'
// for example: '[copy [\uAC00-\uD7FF]]'
// These options will move end to the second ']' and the 
// caller will set the current to it.
static
uint8_t ucol_uprv_tok_readAndSetOption(UColTokenParser *src, UErrorCode *status) {
  const UChar* start = src->current;
  int32_t i = 0;
  int32_t j=0;
  const UChar *optionArg = NULL;

  uint8_t result = 0;

  ucol_uprv_tok_initData();

  start++; /*skip opening '['*/
  i = ucol_uprv_tok_readOption(start, src->end, &optionArg);
  if(optionArg) {
    src->current = optionArg;
  }

  if(i < 0) {
    *status = U_ILLEGAL_ARGUMENT_ERROR;
  } else if(i<7) {
    if(optionArg) {
      for(j = 0; j<rulesOptions[i].subSize; j++) {
        if(u_strncmpNoCase(optionArg, rulesOptions[i].subopts[j].subName, rulesOptions[i].subopts[j].subLen) == 0) {
          ucol_uprv_tok_setOptionInImage(src->opts, rulesOptions[i].attr, rulesOptions[i].subopts[j].attrVal);
          result =  UCOL_TOK_SUCCESS;
        }
      }
    } 
    if(result == 0) {
      *status = U_ILLEGAL_ARGUMENT_ERROR;
    }
  } else if(i == 7) { /* variable top */
    result = UCOL_TOK_SUCCESS | UCOL_TOK_VARIABLE_TOP;
  } else if(i == 8) {  /*rearange */
    result = UCOL_TOK_SUCCESS;
  } else if(i == 9) {  /*before*/
    if(optionArg) {
      for(j = 0; j<rulesOptions[i].subSize; j++) {
        if(u_strncmpNoCase(optionArg, rulesOptions[i].subopts[j].subName, rulesOptions[i].subopts[j].subLen) == 0) {
        result = UCOL_TOK_SUCCESS | rulesOptions[i].subopts[j].attrVal + 1;
        }
      }
    }
    if(result == 0) {
      *status = U_ILLEGAL_ARGUMENT_ERROR;
    }
    
  } else if(i == 10) {  /*top */ /* we are going to have an array with structures of limit CEs */
    /* index to this array will be src->parsedToken.indirectIndex*/
    src->parsedToken.indirectIndex = 0;
    result = UCOL_TOK_SUCCESS | UCOL_TOK_TOP;
  } else if(i == 11 || i ==12) { /* first, last */
    for(j = 0; j<rulesOptions[i].subSize; j++) {
      if(u_strncmpNoCase(optionArg, rulesOptions[i].subopts[j].subName, rulesOptions[i].subopts[j].subLen) == 0) {
        src->parsedToken.indirectIndex = (uint16_t)(i-10+j*2);         
        result =  UCOL_TOK_SUCCESS | UCOL_TOK_TOP;;
      }
    }
    if(result == 0) {
      *status = U_ILLEGAL_ARGUMENT_ERROR;
    }
  } else if(i == 13 || i == 14) { // copy and remove are handled before normalization
    // we need to move end here
    int32_t noOpenBraces = 1;
    src->current++; // skip opening brace
    while(src->current < src->end && noOpenBraces != 0) {
      if(*src->current == 0x005b) {
        noOpenBraces++;
      } else if(*src->current == 0x005D) { // closing brace
        noOpenBraces--;
      }
      src->current++;
    }
    result = UCOL_TOK_SUCCESS;
  } else {
    *status = U_UNSUPPORTED_ERROR;
  }
  //src->current = u_strchr(src->current, 0x005d /*']'*/);
  src->current = u_memchr(src->current, 0x005d, src->end-src->current);
  return result;
}

inline UBool ucol_tok_doSetTop(UColTokenParser *src) {
  /*
  top = TRUE;
  */
  src->parsedToken.charsOffset = (uint32_t)(src->extraCurrent - src->source);
  *src->extraCurrent++ = 0xFFFE;
  *src->extraCurrent++ = (UChar)(ucolIndirectBoundaries[src->parsedToken.indirectIndex].startCE >> 16);
  *src->extraCurrent++ = (UChar)(ucolIndirectBoundaries[src->parsedToken.indirectIndex].startCE & 0xFFFF);
  if(ucolIndirectBoundaries[src->parsedToken.indirectIndex].startContCE == 0) {
    src->parsedToken.charsLen = 3;
  } else {
    *src->extraCurrent++ = (UChar)(ucolIndirectBoundaries[src->parsedToken.indirectIndex].startContCE >> 16);
    *src->extraCurrent++ = (UChar)(ucolIndirectBoundaries[src->parsedToken.indirectIndex].startContCE & 0xFFFF);
    src->parsedToken.charsLen = 5;
  } 
  return TRUE;
}

U_CAPI const UChar* U_EXPORT2
ucol_tok_parseNextToken(UColTokenParser *src, 
                        UBool startOfRules,
                        UParseError *parseError,
                        UErrorCode *status) { 
/* parsing part */
  UBool variableTop = FALSE;
  UBool top = FALSE;
  UBool inChars = TRUE;
  UBool inQuote = FALSE;
  UBool wasInQuote = FALSE;
  UChar *optionEnd = NULL;
  uint8_t before = 0;
  UBool isEscaped = FALSE;
  // TODO: replace these variables with src->parsedToken counterparts
  // no need to use them anymore since we have src->parsedToken.
  // Ideally, token parser would be a nice class... Once, when I have
  // more time (around 2020 probably).
  uint32_t newExtensionLen = 0;
  uint32_t extensionOffset = 0;
  uint32_t newStrength = UCOL_TOK_UNSET; 

  src->parsedToken.charsOffset = 0;  src->parsedToken.charsLen = 0;
  src->parsedToken.prefixOffset = 0; src->parsedToken.prefixLen = 0;
  src->parsedToken.indirectIndex = 0;

  while (src->current < src->end) {
    UChar ch = *(src->current);

    if (inQuote) {
      if (ch == 0x0027/*'\''*/) {
          inQuote = FALSE;
      } else {
        if ((src->parsedToken.charsLen == 0) || inChars) {
          if(src->parsedToken.charsLen == 0) {
            src->parsedToken.charsOffset = (uint32_t)(src->extraCurrent - src->source);
          }
          src->parsedToken.charsLen++;
        } else {
          if(newExtensionLen == 0) {
            extensionOffset = (uint32_t)(src->extraCurrent - src->source);
          }
          newExtensionLen++;
        }
      }
    }else if(isEscaped){
      isEscaped =FALSE;
      if (newStrength == UCOL_TOK_UNSET) {
		*status = U_INVALID_FORMAT_ERROR;
        syntaxError(src->source,(int32_t)(src->current-src->source),(int32_t)(src->end-src->source),parseError);
        return NULL;
        // enabling rules to start with non-tokens a < b
		// newStrength = UCOL_TOK_RESET;
      }
      if(ch != 0x0000  && src->current != src->end) {
          if (inChars) {
            if(src->parsedToken.charsLen == 0) {
              src->parsedToken.charsOffset = (uint32_t)(src->current - src->source);
            }
            src->parsedToken.charsLen++;
          } else {
            if(newExtensionLen == 0) {
              extensionOffset = (uint32_t)(src->current - src->source);
            }
            newExtensionLen++;
          }
      }
    }else {
      if(!uprv_isRuleWhiteSpace(ch)) {
        /* Sets the strength for this entry */
        switch (ch) {
          case 0x003D/*'='*/ : 
            if (newStrength != UCOL_TOK_UNSET) {
              goto EndOfLoop;
            }

            /* if we start with strength, we'll reset to top */
            if(startOfRules == TRUE) {
              src->parsedToken.indirectIndex = 5;
              top = ucol_tok_doSetTop(src);
              newStrength = UCOL_TOK_RESET;
              goto EndOfLoop;
            }
            newStrength = UCOL_IDENTICAL;
            break;

          case 0x002C/*','*/:  
            if (newStrength != UCOL_TOK_UNSET) {
              goto EndOfLoop;
            }

            /* if we start with strength, we'll reset to top */
            if(startOfRules == TRUE) {
              src->parsedToken.indirectIndex = 5;
              top = ucol_tok_doSetTop(src);
              newStrength = UCOL_TOK_RESET;
              goto EndOfLoop;
            }
            newStrength = UCOL_TERTIARY;
            break;

          case  0x003B/*';'*/:
            if (newStrength != UCOL_TOK_UNSET) {
              goto EndOfLoop;
            }

            /* if we start with strength, we'll reset to top */
            if(startOfRules == TRUE) {
              src->parsedToken.indirectIndex = 5;
              top = ucol_tok_doSetTop(src);
              newStrength = UCOL_TOK_RESET;
              goto EndOfLoop;
            }
            newStrength = UCOL_SECONDARY;
            break;

          case 0x003C/*'<'*/:  
            if (newStrength != UCOL_TOK_UNSET) {
              goto EndOfLoop;
            }

            /* if we start with strength, we'll reset to top */
            if(startOfRules == TRUE) {
              src->parsedToken.indirectIndex = 5;
              top = ucol_tok_doSetTop(src);
              newStrength = UCOL_TOK_RESET;
              goto EndOfLoop;
            }
            /* before this, do a scan to verify whether this is */
            /* another strength */
            if(*(src->current+1) == 0x003C) {
              src->current++;
              if(*(src->current+1) == 0x003C) {
                src->current++; /* three in a row! */
                newStrength = UCOL_TERTIARY;
              } else { /* two in a row */
                newStrength = UCOL_SECONDARY;
              }
            } else { /* just one */
              newStrength = UCOL_PRIMARY;
            }
            break;

          case 0x0026/*'&'*/:  
            if (newStrength != UCOL_TOK_UNSET) {
              /**/
              goto EndOfLoop;
            }

            newStrength = UCOL_TOK_RESET; /* PatternEntry::RESET = 0 */
            break;

          case 0x005b/*'['*/:
            /* options - read an option, analyze it */
            if((optionEnd = u_strchr(src->current, 0x005d /*']'*/)) != NULL) {
              uint8_t result = ucol_uprv_tok_readAndSetOption(src, status);
              //src->current = optionEnd;
              if(U_SUCCESS(*status)) {
                if(result & UCOL_TOK_TOP) {
                  if(newStrength == UCOL_TOK_RESET) { 
                    top = ucol_tok_doSetTop(src);
                    if(before) { // This is a combination of before and indirection like '&[before 2][first regular]<b'
                      *src->extraCurrent++ = 0x002d;
                      *src->extraCurrent++ = before;
                      src->parsedToken.charsLen+=2;
                    }

                    src->current++;
                    goto EndOfLoop;
                  } else {
                    *status = U_INVALID_FORMAT_ERROR;
                    syntaxError(src->source,(int32_t)(src->current-src->source),(int32_t)(src->end-src->source),parseError);
                  }
                } else if(result & UCOL_TOK_VARIABLE_TOP) {
                  if(newStrength != UCOL_TOK_RESET && newStrength != UCOL_TOK_UNSET) {
                    variableTop = TRUE;
                    src->parsedToken.charsOffset = (uint32_t)(src->extraCurrent - src->source);
                    src->parsedToken.charsLen = 1;
                    *src->extraCurrent++ = 0xFFFF;
                    src->current++;
                    goto EndOfLoop;
                  } else {
                    *status = U_INVALID_FORMAT_ERROR;
                    syntaxError(src->source,(int32_t)(src->current-src->source),(int32_t)(src->end-src->source),parseError);
                  }
                } else if (result & UCOL_TOK_BEFORE){
                  if(newStrength == UCOL_TOK_RESET) {
                    before = result & UCOL_TOK_BEFORE;
                  } else {
                    *status = U_INVALID_FORMAT_ERROR;
                    syntaxError(src->source,(int32_t)(src->current-src->source),(int32_t)(src->end-src->source),parseError);

                  }
                } 
              } else {
                *status = U_INVALID_FORMAT_ERROR;
                syntaxError(src->source,(int32_t)(src->current-src->source),(int32_t)(src->end-src->source),parseError);
                return NULL;
              }
            }
            break;
		  case 0x0021/*! skip java thai modifier reordering*/:
			  break; 
          case 0x002F/*'/'*/:
            wasInQuote = FALSE; /* if we were copying source characters, we want to stop now */
            inChars = FALSE; /* we're now processing expansion */
            break;
          case 0x005C /* back slash for escaped chars */:
              isEscaped = TRUE;
              break;
          /* found a quote, we're gonna start copying */
          case 0x0027/*'\''*/:
            if (newStrength == UCOL_TOK_UNSET) { /* quote is illegal until we have a strength */
			  *status = U_INVALID_FORMAT_ERROR;
              syntaxError(src->source,(int32_t)(src->current-src->source),(int32_t)(src->end-src->source),parseError);
              return NULL;
			  // enabling rules to start with a non-token character a < b
              // newStrength = UCOL_TOK_RESET;
            }

            inQuote = TRUE;

            if(inChars) { /* we're doing characters */
              if(wasInQuote == FALSE) {
                src->parsedToken.charsOffset = (uint32_t)(src->extraCurrent - src->source);
              }
              if (src->parsedToken.charsLen != 0) {
                  uprv_memcpy(src->extraCurrent, src->current - src->parsedToken.charsLen, src->parsedToken.charsLen*sizeof(UChar));
                  src->extraCurrent += src->parsedToken.charsLen;
              }
              src->parsedToken.charsLen++;
            } else { /* we're doing an expansion */
              if(wasInQuote == FALSE) {
                extensionOffset = (uint32_t)(src->extraCurrent - src->source);
              }
              if (newExtensionLen != 0) {
                uprv_memcpy(src->extraCurrent, src->current - newExtensionLen, newExtensionLen*sizeof(UChar));
                src->extraCurrent += newExtensionLen;
              }
              newExtensionLen++;
            }

            wasInQuote = TRUE;

            ch = *(++(src->current)); 
            if(ch == 0x0027) { /* copy the double quote */
              *src->extraCurrent++ = ch;
              inQuote = FALSE;
            }
            break;

          /* '@' is french only if the strength is not currently set */
          /* if it is, it's just a regular character in collation rules */
          case 0x0040/*'@'*/:
            if (newStrength == UCOL_TOK_UNSET) {
              src->opts->frenchCollation = UCOL_ON;
              break;
            }

          case 0x007C /*|*/: /* this means we have actually been reading prefix part */
            // we want to store read characters to the prefix part and continue reading
            // the characters (proper way would be to restart reading the chars, but in
            // that case we would have to complicate the token hasher, which I do not 
            // intend to play with. Instead, we will do prefixes when prefixes are due
            // (before adding the elements).
            src->parsedToken.prefixOffset = src->parsedToken.charsOffset;
            src->parsedToken.prefixLen = src->parsedToken.charsLen;

            if(inChars) { /* we're doing characters */
              if(wasInQuote == FALSE) {
                src->parsedToken.charsOffset = (uint32_t)(src->extraCurrent - src->source);
              }
              if (src->parsedToken.charsLen != 0) {
                  uprv_memcpy(src->extraCurrent, src->current - src->parsedToken.charsLen, src->parsedToken.charsLen*sizeof(UChar));
                  src->extraCurrent += src->parsedToken.charsLen;
              }
              src->parsedToken.charsLen++;
            }

            wasInQuote = TRUE;

            do {
              ch = *(++(src->current)); 
              // skip whitespace between '|' and the character
            } while (uprv_isRuleWhiteSpace(ch));
            break;
          
            //charsOffset = 0;
            //newCharsLen = 0;
            //break; // We want to store the whole prefix/character sequence. If we break
                     // the '|' is going to get lost.
          default:
            if (newStrength == UCOL_TOK_UNSET) {
			  *status = U_INVALID_FORMAT_ERROR;
              syntaxError(src->source,(int32_t)(src->current-src->source),(int32_t)(src->end-src->source),parseError);
              return NULL;
            }

            if (ucol_tok_isSpecialChar(ch) && (inQuote == FALSE)) {
              *status = U_INVALID_FORMAT_ERROR;
              syntaxError(src->source,(int32_t)(src->current-src->source),(int32_t)(src->end-src->source),parseError);
              return NULL;
            }

            if(ch == 0x0000 && src->current+1 == src->end) {
              break;
            }

            if (inChars) {
              if(src->parsedToken.charsLen == 0) {
                src->parsedToken.charsOffset = (uint32_t)(src->current - src->source);
              }
              src->parsedToken.charsLen++;
            } else {
              if(newExtensionLen == 0) {
                extensionOffset = (uint32_t)(src->current - src->source);
              }
              newExtensionLen++;
            }

            break;
          }         
       }
    }

    if(wasInQuote) {
      if(ch != 0x27) {
        *src->extraCurrent++ = ch;
      }
      if(src->extraCurrent > src->extraEnd) {
        /* reallocate */
        UChar *newSrc = (UChar *)uprv_realloc(src->source, (src->extraEnd-src->source)*2*sizeof(UChar));
        if(newSrc != NULL) {
          src->current = newSrc + (src->current - src->source);
          src->extraCurrent = newSrc + (src->extraCurrent - src->source);
          src->end = newSrc + (src->end - src->source);
          src->extraEnd = newSrc + (src->extraEnd-src->source)*2;
          src->sourceCurrent = newSrc + (src->sourceCurrent-src->source);
          src->source = newSrc;
        } else {
          *status = U_MEMORY_ALLOCATION_ERROR;
          return NULL;
        }
      }
    }

      src->current++;
    }

 EndOfLoop:
    wasInQuote = FALSE;
  if (newStrength == UCOL_TOK_UNSET) {
    return NULL;
  }

  if (src->parsedToken.charsLen == 0 && top == FALSE) {
    syntaxError(src->source,(int32_t)(src->current-src->source),(int32_t)(src->end-src->source),parseError); 
    *status = U_INVALID_FORMAT_ERROR;
    return NULL;
  }

  src->parsedToken.strength = newStrength; 
  src->parsedToken.extensionOffset = extensionOffset;
  src->parsedToken.extensionLen = newExtensionLen;
  src->parsedToken.flags = (UCOL_TOK_VARIABLE_TOP * (variableTop?1:0)) | (UCOL_TOK_TOP * (top?1:0)) | before;

  return src->current;
}

/*
Processing Description
  1 Build a ListList. Each list has a header, which contains two lists (positive 
  and negative), a reset token, a baseCE, nextCE, and previousCE. The lists and 
  reset may be null. 
  2 As you process, you keep a LAST pointer that points to the last token you 
  handled. 
*/

static UColToken *ucol_tok_initAReset(UColTokenParser *src, UChar *expand, uint32_t *expandNext,
                                      UParseError *parseError, UErrorCode *status) {
  if(src->resultLen == src->listCapacity) {
    // Unfortunately, this won't work, as we store addresses of lhs in token
    src->listCapacity *= 2;
    src->lh = (UColTokListHeader *)uprv_realloc(src->lh, src->listCapacity*sizeof(UColTokListHeader));
    if(src->lh == NULL) {
      *status = U_MEMORY_ALLOCATION_ERROR;
      return NULL;
    }
  }
  /* do the reset thing */
  UColToken *sourceToken = (UColToken *)uprv_malloc(sizeof(UColToken));
  /* test for NULL */
  if (sourceToken == NULL) {
      *status = U_MEMORY_ALLOCATION_ERROR;
      return NULL;
  }
  sourceToken->rulesToParse = src->source;
  sourceToken->source = src->parsedToken.charsLen << 24 | src->parsedToken.charsOffset;
  sourceToken->expansion = src->parsedToken.extensionLen << 24 | src->parsedToken.extensionOffset;

  sourceToken->debugSource = *(src->source + src->parsedToken.charsOffset);
  sourceToken->debugExpansion = *(src->source + src->parsedToken.extensionOffset);

  if(src->parsedToken.prefixOffset != 0) {
    // this is a syntax error 
    *status = U_INVALID_FORMAT_ERROR;
    syntaxError(src->source,src->parsedToken.charsOffset-1,src->parsedToken.charsOffset+src->parsedToken.charsLen,parseError);
    return 0;
  } else {
    sourceToken->prefix = 0;
  }

  sourceToken->polarity = UCOL_TOK_POLARITY_POSITIVE; /* TODO: this should also handle reverse */
  sourceToken->strength = UCOL_TOK_RESET;
  sourceToken->next = NULL;
  sourceToken->previous = NULL;
  sourceToken->noOfCEs = 0;
  sourceToken->noOfExpCEs = 0;
  sourceToken->listHeader = &src->lh[src->resultLen];

  src->lh[src->resultLen].first = NULL;
  src->lh[src->resultLen].last = NULL;
  src->lh[src->resultLen].first = NULL;
  src->lh[src->resultLen].last = NULL;

  src->lh[src->resultLen].reset = sourceToken;

  /*
    3 Consider each item: relation, source, and expansion: e.g. ...< x / y ... 
      First convert all expansions into normal form. Examples: 
        If "xy" doesn't occur earlier in the list or in the UCA, convert &xy * c * 
        d * ... into &x * c/y * d * ... 
        Note: reset values can never have expansions, although they can cause the 
        very next item to have one. They may be contractions, if they are found 
        earlier in the list. 
  */
  if(expand != NULL) {
    /* check to see if there is an expansion */
    if(src->parsedToken.charsLen > 1) {
      uint32_t resetCharsOffset;
      resetCharsOffset = (uint32_t)(expand - src->source);
      sourceToken->source = ((resetCharsOffset - src->parsedToken.charsOffset ) << 24) | src->parsedToken.charsOffset;
      *expandNext = ((src->parsedToken.charsLen + src->parsedToken.charsOffset - resetCharsOffset)<<24) | (resetCharsOffset);
    } else {
      *expandNext = 0;
    }
  }

  src->resultLen++;

  uhash_put(src->tailored, sourceToken, sourceToken, status);

  return sourceToken;
}

static
inline UColToken *getVirginBefore(UColTokenParser *src, UColToken *sourceToken, uint8_t strength, UParseError *parseError, UErrorCode *status) {
  if(U_FAILURE(*status)) {
    return NULL;
  }
      /* this is a virgin before - we need to fish the anchor from the UCA */
  collIterate s;
  uint32_t baseCE = UCOL_NOT_FOUND, baseContCE = UCOL_NOT_FOUND;
  uint32_t CE, SecondCE;
  uint32_t invPos;
  if(sourceToken != NULL) {
    uprv_init_collIterate(src->UCA, src->source+((sourceToken->source)&0xFFFFFF), 1, &s); 
  } else {
    uprv_init_collIterate(src->UCA, src->source+src->parsedToken.charsOffset /**charsOffset*/, 1, &s); 
  }

  baseCE = ucol_getNextCE(src->UCA, &s, status) & 0xFFFFFF3F;
  baseContCE = ucol_getNextCE(src->UCA, &s, status);
  if(baseContCE == UCOL_NO_MORE_CES) {
    baseContCE = 0;
  }

  invPos = ucol_inv_getPrevCE(baseCE, baseContCE, &CE, &SecondCE, strength);

  uint32_t *CETable = (uint32_t *)((uint8_t *)src->invUCA+src->invUCA->table);
  uint32_t ch = CETable[3*invPos+2];

  if((ch &  UCOL_INV_SIZEMASK) != 0) {
    uint16_t *conts = (uint16_t *)((uint8_t *)src->invUCA+src->invUCA->conts);
    uint32_t offset = (ch & UCOL_INV_OFFSETMASK);
    ch = conts[offset];
  }      
  *src->extraCurrent++ = (UChar)ch;
  src->parsedToken.charsOffset = (uint32_t)(src->extraCurrent - src->source - 1);
  src->parsedToken.charsLen = 1;

  // We got an UCA before. However, this might have been tailored.
  // example:
  // &\u30ca = \u306a
  // &[before 3]\u306a<<<\u306a|\u309d
  
  
  // uint32_t key = (*newCharsLen << 24) | *charsOffset;
  UColToken key;
  uint32_t expandNext = 0;
  key.source = (src->parsedToken.charsLen/**newCharsLen*/ << 24) | src->parsedToken.charsOffset/**charsOffset*/;
  key.rulesToParse = src->source;

  //sourceToken = (UColToken *)uhash_iget(src->tailored, (int32_t)key);
  sourceToken = (UColToken *)uhash_get(src->tailored, &key);
  
  // if we found a tailored thing, we have to use the UCA value and construct 
  // a new reset token with constructed name
  if(sourceToken != NULL && sourceToken->strength != UCOL_TOK_RESET) {
    // character to which we want to anchor is already tailored. 
    // We need to construct a new token which will be the anchor
    // point
    *(src->extraCurrent-1) = 0xFFFE;
    *src->extraCurrent++ = (UChar)ch;
    src->parsedToken.charsLen++;
    src->lh[src->resultLen].baseCE = CE & 0xFFFFFF3F;
    if(isContinuation(SecondCE)) {
      src->lh[src->resultLen].baseContCE = SecondCE;
    } else {
      src->lh[src->resultLen].baseContCE = 0;
    }
    src->lh[src->resultLen].nextCE = 0;
    src->lh[src->resultLen].nextContCE = 0;
    src->lh[src->resultLen].previousCE = 0;
    src->lh[src->resultLen].previousContCE = 0;

    src->lh[src->resultLen].indirect = FALSE;

    sourceToken = ucol_tok_initAReset(src, 0, &expandNext, parseError, status);   
  }

  return sourceToken;

}

uint32_t ucol_tok_assembleTokenList(UColTokenParser *src, UParseError *parseError, UErrorCode *status) {
  UColToken *lastToken = NULL;
  const UChar *parseEnd = NULL;
  uint32_t expandNext = 0;
  UBool variableTop = FALSE;
  UBool top = FALSE;
  uint16_t specs = 0;
  UColTokListHeader *ListList = NULL;

  src->parsedToken.strength = UCOL_TOK_UNSET; 

  ListList = src->lh;

  if(U_FAILURE(*status)) {
      return 0;
  }

  while(src->current < src->end) {
    src->parsedToken.prefixOffset = 0;
  
    parseEnd = ucol_tok_parseNextToken(src, 
                        (UBool)(lastToken == NULL),
                        parseError,
                        status);

    specs = src->parsedToken.flags;


    variableTop = ((specs & UCOL_TOK_VARIABLE_TOP) != 0);
    top = ((specs & UCOL_TOK_TOP) != 0);

    if(U_SUCCESS(*status) && parseEnd != NULL) {
      UColToken *sourceToken = NULL;
      //uint32_t key = 0;
      uint32_t lastStrength = UCOL_TOK_UNSET;
      
      if(lastToken != NULL ) {
        lastStrength = lastToken->strength;
      }

      //key = newCharsLen << 24 | charsOffset;
      UColToken key;
      key.source = src->parsedToken.charsLen << 24 | src->parsedToken.charsOffset;
      key.rulesToParse = src->source;

      /*  4 Lookup each source in the CharsToToken map, and find a sourceToken */
      sourceToken = (UColToken *)uhash_get(src->tailored, &key);

      if(src->parsedToken.strength != UCOL_TOK_RESET) {
        if(lastToken == NULL) { /* this means that rules haven't started properly */
          *status = U_INVALID_FORMAT_ERROR;
          syntaxError(src->source,0,(int32_t)(src->end-src->source),parseError);
          return 0;
        }
      /*  6 Otherwise (when relation != reset) */
        if(sourceToken == NULL) {
          /* If sourceToken is null, create new one, */
          sourceToken = (UColToken *)uprv_malloc(sizeof(UColToken));
          /* test for NULL */
          if (sourceToken == NULL) {
              *status = U_MEMORY_ALLOCATION_ERROR;
              return 0;
          }
          sourceToken->rulesToParse = src->source;
          sourceToken->source = src->parsedToken.charsLen << 24 | src->parsedToken.charsOffset;

          sourceToken->debugSource = *(src->source + src->parsedToken.charsOffset);

          sourceToken->prefix = src->parsedToken.prefixLen << 24 | src->parsedToken.prefixOffset;
          sourceToken->debugPrefix = *(src->source + src->parsedToken.prefixOffset);

          sourceToken->polarity = UCOL_TOK_POLARITY_POSITIVE; /* TODO: this should also handle reverse */
          sourceToken->next = NULL;
          sourceToken->previous = NULL;
          sourceToken->noOfCEs = 0;
          sourceToken->noOfExpCEs = 0;
          uhash_put(src->tailored, sourceToken, sourceToken, status);
        } else {
          /* we could have fished out a reset here */
          if(sourceToken->strength != UCOL_TOK_RESET && lastToken != sourceToken) {
            /* otherwise remove sourceToken from where it was. */
            if(sourceToken->next != NULL) {
              if(sourceToken->next->strength > sourceToken->strength) {
                sourceToken->next->strength = sourceToken->strength;
              }
              sourceToken->next->previous = sourceToken->previous;
            } else {
              sourceToken->listHeader->last = sourceToken->previous;
            }

            if(sourceToken->previous != NULL) {
              sourceToken->previous->next = sourceToken->next;
            } else {
              sourceToken->listHeader->first = sourceToken->next;
            }
            sourceToken->next = NULL;
            sourceToken->previous = NULL;
          }
        }

        sourceToken->strength = src->parsedToken.strength;
        sourceToken->listHeader = lastToken->listHeader;

        /*
        1.  Find the strongest strength in each list, and set strongestP and strongestN 
        accordingly in the headers. 
        */
        if(lastStrength == UCOL_TOK_RESET 
          || sourceToken->listHeader->first == 0) {
        /* If LAST is a reset 
              insert sourceToken in the list. */
          if(sourceToken->listHeader->first == 0) {
            sourceToken->listHeader->first = sourceToken;
            sourceToken->listHeader->last = sourceToken;
          } else { /* we need to find a place for us */
            /* and we'll get in front of the same strength */
            if(sourceToken->listHeader->first->strength <= sourceToken->strength) {
              sourceToken->next = sourceToken->listHeader->first;
              sourceToken->next->previous = sourceToken;
              sourceToken->listHeader->first = sourceToken;
              sourceToken->previous = NULL;
            } else {
              lastToken = sourceToken->listHeader->first;
              while(lastToken->next != NULL && lastToken->next->strength > sourceToken->strength) {
                lastToken = lastToken->next;
              }
              if(lastToken->next != NULL) {
                lastToken->next->previous = sourceToken;
              } else {
                sourceToken->listHeader->last = sourceToken;
              }
              sourceToken->previous = lastToken;
              sourceToken->next = lastToken->next;
              lastToken->next = sourceToken;
            }
          }
        } else {
        /* Otherwise (when LAST is not a reset) 
              if polarity (LAST) == polarity(relation), insert sourceToken after LAST, 
              otherwise insert before. 
              when inserting after or before, search to the next position with the same 
              strength in that direction. (This is called postpone insertion).         */
          if(sourceToken != lastToken) { 
            if(lastToken->polarity == sourceToken->polarity) {
              while(lastToken->next != NULL && lastToken->next->strength > sourceToken->strength) {
                lastToken = lastToken->next;
              }
              sourceToken->previous = lastToken;
              if(lastToken->next != NULL) {
                lastToken->next->previous = sourceToken;
              } else {
                sourceToken->listHeader->last = sourceToken;
              }

              sourceToken->next = lastToken->next;
              lastToken->next = sourceToken;
            } else {
              while(lastToken->previous != NULL && lastToken->previous->strength > sourceToken->strength) {
                lastToken = lastToken->previous;
              }
              sourceToken->next = lastToken;
              if(lastToken->previous != NULL) {
                lastToken->previous->next = sourceToken;
              } else {
                sourceToken->listHeader->first = sourceToken;
              }
              sourceToken->previous = lastToken->previous;
              lastToken->previous = sourceToken;
            }
          } else { /* repeated one thing twice in rules, stay with the stronger strength */
            if(lastStrength < sourceToken->strength) {
              sourceToken->strength = lastStrength;
            }
          }
        }

        /* if the token was a variable top, we're gonna put it in */
        if(variableTop == TRUE && src->varTop == NULL) {
          variableTop = FALSE;
          src->varTop = sourceToken;
        }

       // Treat the expansions.
       // There are two types of expansions: explicit (x / y) and reset based propagating expansions 
       // (&abc * d * e <=> &ab * d / c * e / c) 
       // if both of them are in effect for a token, they are combined.

        sourceToken->expansion = src->parsedToken.extensionLen << 24 | src->parsedToken.extensionOffset;

        if(expandNext != 0) {
          if(sourceToken->strength == UCOL_PRIMARY) { /* primary strength kills off the implicit expansion */
            expandNext = 0;
          } else if(sourceToken->expansion == 0) { /* if there is no expansion, implicit is just added to the token */
            sourceToken->expansion = expandNext;
          } else { /* there is both explicit and implicit expansion. We need to make a combination */
            uprv_memcpy(src->extraCurrent, src->source + (expandNext & 0xFFFFFF), (expandNext >> 24)*sizeof(UChar));
            uprv_memcpy(src->extraCurrent+(expandNext >> 24), src->source + src->parsedToken.extensionOffset, src->parsedToken.extensionLen*sizeof(UChar));
            sourceToken->expansion = (uint32_t)(((expandNext >> 24) + src->parsedToken.extensionLen)<<24 | (src->extraCurrent - src->source));
            src->extraCurrent += (expandNext >> 24) + src->parsedToken.extensionLen;
          }
        }

        // This is just for debugging purposes
        if(sourceToken->expansion != 0) {
          sourceToken->debugExpansion = *(src->source + src->parsedToken.extensionOffset);
        } else {
          sourceToken->debugExpansion = 0;
        }
      } else {
        if(lastToken != NULL && lastStrength == UCOL_TOK_RESET) {
          /* if the previous token was also a reset, */
          /*this means that we have two consecutive resets */
          /* and we want to remove the previous one if empty*/
          if(ListList[src->resultLen-1].first == NULL) {
            src->resultLen--;
          }
        }

        if(sourceToken == NULL) { /* this is a reset, but it might still be somewhere in the tailoring, in shorter form */
          uint32_t searchCharsLen = src->parsedToken.charsLen;
          while(searchCharsLen > 1 && sourceToken == NULL) {
            searchCharsLen--;
            //key = searchCharsLen << 24 | charsOffset;
            UColToken key;
            key.source = searchCharsLen << 24 | src->parsedToken.charsOffset;
            key.rulesToParse = src->source;
            sourceToken = (UColToken *)uhash_get(src->tailored, &key);
          }
          if(sourceToken != NULL) {
            expandNext = (src->parsedToken.charsLen - searchCharsLen) << 24 | (src->parsedToken.charsOffset + searchCharsLen);
          }
        }

        if((specs & UCOL_TOK_BEFORE) != 0) { /* we're doing before */
          if(top == FALSE) { /* there is no indirection */
            uint8_t strength = (specs & UCOL_TOK_BEFORE) - 1;
            if(sourceToken != NULL && sourceToken->strength != UCOL_TOK_RESET) { 
              /* this is a before that is already ordered in the UCA - so we need to get the previous with good strength */
              while(sourceToken->strength > strength && sourceToken->previous != NULL) {
                sourceToken = sourceToken->previous;
              }
              /* here, either we hit the strength or NULL */
              if(sourceToken->strength == strength) {
                if(sourceToken->previous != NULL) {
                  sourceToken = sourceToken->previous;
                } else { /* start of list */
                  sourceToken = sourceToken->listHeader->reset;
                }              
              } else { /* we hit NULL */
                /* we should be doing the else part */
                sourceToken = sourceToken->listHeader->reset;
                sourceToken = getVirginBefore(src, sourceToken, strength, parseError, status);
              }
            } else {
              sourceToken = getVirginBefore(src, sourceToken, strength, parseError, status);
            }
          } else { /* this is both before and indirection */
            top = FALSE;
            ListList[src->resultLen].previousCE = 0;
            ListList[src->resultLen].previousContCE = 0;
            ListList[src->resultLen].indirect = TRUE;
            /* we need to do slightly more work. we need to get the baseCE using the */
            /* inverse UCA & getPrevious. The next bound is not set, and will be decided */
            /* in ucol_bld */
            uint8_t strength = (specs & UCOL_TOK_BEFORE) - 1;
            uint32_t baseCE = ucolIndirectBoundaries[src->parsedToken.indirectIndex].startCE;
            uint32_t baseContCE = ucolIndirectBoundaries[src->parsedToken.indirectIndex].startContCE;//&0xFFFFFF3F;
            uint32_t CE = UCOL_NOT_FOUND, SecondCE = UCOL_NOT_FOUND;

            /*int32_t invPos = ucol_inv_getPrevCE(baseCE, baseContCE, &CE, &SecondCE, strength);*/
            ucol_inv_getPrevCE(baseCE, baseContCE, &CE, &SecondCE, strength);

            ListList[src->resultLen].baseCE = CE;
            ListList[src->resultLen].baseContCE = SecondCE;
            ListList[src->resultLen].nextCE = 0;
            ListList[src->resultLen].nextContCE = 0;

            sourceToken = ucol_tok_initAReset(src, 0, &expandNext, parseError, status);
          }
        }


      /*  5 If the relation is a reset: 
          If sourceToken is null 
            Create new list, create new sourceToken, make the baseCE from source, put 
            the sourceToken in ListHeader of the new list */
        if(sourceToken == NULL) {
          /*
            3 Consider each item: relation, source, and expansion: e.g. ...< x / y ... 
              First convert all expansions into normal form. Examples: 
                If "xy" doesn't occur earlier in the list or in the UCA, convert &xy * c * 
                d * ... into &x * c/y * d * ... 
                Note: reset values can never have expansions, although they can cause the 
                very next item to have one. They may be contractions, if they are found 
                earlier in the list. 
          */
          if(top == FALSE) {
            collIterate s;
            uint32_t CE = UCOL_NOT_FOUND, SecondCE = UCOL_NOT_FOUND;

            uprv_init_collIterate(src->UCA, src->source+src->parsedToken.charsOffset, src->parsedToken.charsLen, &s);

            CE = ucol_getNextCE(src->UCA, &s, status);
            UChar *expand = s.pos;
            SecondCE = ucol_getNextCE(src->UCA, &s, status);

            ListList[src->resultLen].baseCE = CE & 0xFFFFFF3F;
            if(isContinuation(SecondCE)) {
              ListList[src->resultLen].baseContCE = SecondCE;
            } else {
              ListList[src->resultLen].baseContCE = 0;
            }
            ListList[src->resultLen].nextCE = 0;
            ListList[src->resultLen].nextContCE = 0;
            ListList[src->resultLen].previousCE = 0;
            ListList[src->resultLen].previousContCE = 0;
            ListList[src->resultLen].indirect = FALSE;
            sourceToken = ucol_tok_initAReset(src, expand, &expandNext, parseError, status);
          } else { /* top == TRUE */
            /* just use the supplied values */
            top = FALSE;
            ListList[src->resultLen].previousCE = 0;
            ListList[src->resultLen].previousContCE = 0;
            ListList[src->resultLen].indirect = TRUE;
            ListList[src->resultLen].baseCE = ucolIndirectBoundaries[src->parsedToken.indirectIndex].startCE;
            ListList[src->resultLen].baseContCE = ucolIndirectBoundaries[src->parsedToken.indirectIndex].startContCE;
            ListList[src->resultLen].nextCE = ucolIndirectBoundaries[src->parsedToken.indirectIndex].limitCE;
            ListList[src->resultLen].nextContCE = ucolIndirectBoundaries[src->parsedToken.indirectIndex].limitContCE;

            sourceToken = ucol_tok_initAReset(src, 0, &expandNext, parseError, status);

          }
        } else { /* reset to something already in rules */
          top = FALSE;
        }
      }
      /*  7 After all this, set LAST to point to sourceToken, and goto step 3. */  
      lastToken = sourceToken;
    } else {
      if(U_FAILURE(*status)) {
        return 0;
      }
    }
  }

  if(src->resultLen > 0 && ListList[src->resultLen-1].first == NULL) {
    src->resultLen--;
  }
  return src->resultLen;
}

void ucol_tok_initTokenList(UColTokenParser *src, const UChar *rules, const uint32_t rulesLength, UCollator *UCA, UErrorCode *status) {
  uint32_t nSize = 0;
  uint32_t estimatedSize = (2*rulesLength+UCOL_TOK_EXTRA_RULE_SPACE_SIZE);
  if(U_FAILURE(*status)) {
    return;
  }
  
  // set everything to zero, so that we can clean up gracefully
  uprv_memset(src, 0, sizeof(UColTokenParser));
  
  // first we need to find options that don't like to be normalized,
  // like copy and remove...
  //const UChar *openBrace = rules;
  int32_t optionNumber = -1;
  const UChar *setStart;
  uint32_t i = 0;
  while(i < rulesLength) {
    if(rules[i] == 0x005B) {
      // while((openBrace = u_strchr(openBrace, 0x005B)) != NULL) { // find open braces
      //optionNumber = ucol_uprv_tok_readOption(openBrace+1, rules+rulesLength, &setStart);
      optionNumber = ucol_uprv_tok_readOption(rules+i+1, rules+rulesLength, &setStart);
      if(optionNumber == 13) { /* copy - parts of UCA to tailoring */
        USet *newSet = ucol_uprv_tok_readAndSetUnicodeSet(setStart, rules+rulesLength, status);
        if(U_SUCCESS(*status)) {
          if(src->copySet == NULL) {
            src->copySet = newSet;
          } else {
            ((UnicodeSet *)src->copySet)->addAll(*((UnicodeSet *)newSet));
            uset_close(newSet);
          }
        } else {
          return;
        }
      } else if(optionNumber == 14) {
        USet *newSet = ucol_uprv_tok_readAndSetUnicodeSet(setStart, rules+rulesLength, status);
        if(U_SUCCESS(*status)) {
          if(src->removeSet == NULL) {
            src->removeSet = newSet;
          } else {
            ((UnicodeSet *)src->removeSet)->addAll(*((UnicodeSet *)newSet));
            uset_close(newSet);
          }
        } else {
          return;
        }
      }
    }
    //openBrace++;
    i++;
  }

  src->source = (UChar *)uprv_malloc(estimatedSize*sizeof(UChar));
  /* test for NULL */
  if (src->source == NULL) {
      *status = U_MEMORY_ALLOCATION_ERROR;
      return;
  }
  nSize = unorm_normalize(rules, rulesLength, UNORM_NFD, 0, src->source, estimatedSize, status);
  if(nSize > estimatedSize || *status == U_BUFFER_OVERFLOW_ERROR) {
    *status = U_ZERO_ERROR;
    src->source = (UChar *)uprv_realloc(src->source, (nSize+UCOL_TOK_EXTRA_RULE_SPACE_SIZE)*sizeof(UChar));
    /* test for NULL */
    if (src->source == NULL) {
        *status = U_MEMORY_ALLOCATION_ERROR;
        return;
    }
    nSize = unorm_normalize(rules, rulesLength, UNORM_NFD, 0, src->source, nSize+UCOL_TOK_EXTRA_RULE_SPACE_SIZE, status);
  }
  src->current = src->source;
  src->end = src->source+nSize;
  src->sourceCurrent = src->source;
  src->extraCurrent = src->end;
  src->extraEnd = src->source+estimatedSize; //src->end+UCOL_TOK_EXTRA_RULE_SPACE_SIZE;
  src->varTop = NULL;
  src->UCA = UCA;
  src->invUCA = ucol_initInverseUCA(status);
  src->parsedToken.charsLen = 0;
  src->parsedToken.charsOffset = 0;
  src->parsedToken.extensionLen = 0;
  src->parsedToken.extensionOffset = 0;
  src->parsedToken.prefixLen = 0;
  src->parsedToken.prefixOffset = 0;
  src->parsedToken.flags = 0;
  src->parsedToken.strength = UCOL_TOK_UNSET;


  if(U_FAILURE(*status)) {
    return;
  }
  src->tailored = uhash_open(uhash_hashTokens, uhash_compareTokens, status);
  if(U_FAILURE(*status)) {
    return;
  }
  uhash_setValueDeleter(src->tailored, uhash_freeBlock);

  src->opts = (UColOptionSet *)uprv_malloc(sizeof(UColOptionSet));
  /* test for NULL */
  if (src->opts == NULL) {
      *status = U_MEMORY_ALLOCATION_ERROR;
      return;
  }

  uprv_memcpy(src->opts, UCA->options, sizeof(UColOptionSet));

  // rulesToParse = src->source;
  src->lh = 0;
  src->listCapacity = 1024;
  src->lh = (UColTokListHeader *)uprv_malloc(src->listCapacity*sizeof(UColTokListHeader));
  //Test for NULL
  if (src->lh == NULL) {
      *status = U_MEMORY_ALLOCATION_ERROR;
      return;
  }
  src->resultLen = 0;

  UCAConstants *consts = (UCAConstants *)((uint8_t *)src->UCA->image + src->UCA->image->UCAConsts);

  // UCOL_RESET_TOP_VALUE
  setIndirectBoundaries(0, consts->UCA_LAST_NON_VARIABLE, consts->UCA_FIRST_IMPLICIT); 
  // UCOL_FIRST_PRIMARY_IGNORABLE
  setIndirectBoundaries(1, consts->UCA_FIRST_PRIMARY_IGNORABLE, 0);
  // UCOL_LAST_PRIMARY_IGNORABLE
  setIndirectBoundaries(2, consts->UCA_LAST_PRIMARY_IGNORABLE, 0);
  // UCOL_FIRST_SECONDARY_IGNORABLE
  setIndirectBoundaries(3, consts->UCA_FIRST_SECONDARY_IGNORABLE, 0);
  // UCOL_LAST_SECONDARY_IGNORABLE
  setIndirectBoundaries(4, consts->UCA_LAST_SECONDARY_IGNORABLE, 0);
  // UCOL_FIRST_TERTIARY_IGNORABLE
  setIndirectBoundaries(5, consts->UCA_FIRST_TERTIARY_IGNORABLE, 0);
  // UCOL_LAST_TERTIARY_IGNORABLE
  setIndirectBoundaries(6, consts->UCA_LAST_TERTIARY_IGNORABLE, 0);
  // UCOL_FIRST_VARIABLE
  setIndirectBoundaries(7, consts->UCA_FIRST_VARIABLE, 0);
  // UCOL_LAST_VARIABLE
  setIndirectBoundaries(8, consts->UCA_LAST_VARIABLE, 0);
  // UCOL_FIRST_NON_VARIABLE
  setIndirectBoundaries(9, consts->UCA_FIRST_NON_VARIABLE, 0);
  // UCOL_LAST_NON_VARIABLE
  setIndirectBoundaries(10, consts->UCA_LAST_NON_VARIABLE, consts->UCA_FIRST_IMPLICIT);
  // UCOL_FIRST_IMPLICIT
  setIndirectBoundaries(11, consts->UCA_FIRST_IMPLICIT, 0);
  // UCOL_LAST_IMPLICIT
  setIndirectBoundaries(12, consts->UCA_LAST_IMPLICIT, consts->UCA_FIRST_TRAILING);
  // UCOL_FIRST_TRAILING
  setIndirectBoundaries(13, consts->UCA_FIRST_TRAILING, 0);
  // UCOL_LAST_TRAILING
  setIndirectBoundaries(14, consts->UCA_LAST_TRAILING, 0);
  ucolIndirectBoundaries[14].limitCE = (consts->UCA_PRIMARY_SPECIAL_MIN<<24);
}


void ucol_tok_closeTokenList(UColTokenParser *src) {
  if(src->copySet != NULL) {
    uset_close(src->copySet);
  }
  if(src->removeSet != NULL) {
    uset_close(src->removeSet);
  }
  if(src->tailored != NULL) {
    uhash_close(src->tailored);
  }
  if(src->lh != NULL) {
    uprv_free(src->lh);
  }
  if(src->source != NULL) {
    uprv_free(src->source);
  }
  if(src->opts != NULL) {
    uprv_free(src->opts);
  }
}

#endif /* #if !UCONFIG_NO_COLLATION */