text: /*
   * Copyright 2008 Jacek Caban for CodeWeavers
   *
   * This library is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
   */
  
  #include "config.h"
  #include "wine/port.h"
  
  #include <math.h>
  #include <assert.h>
  
  #include "jscript.h"
  
  #include "wine/debug.h"
  
  WINE_DEFAULT_DEBUG_CHANNEL(jscript);
  
  typedef struct {
      jsdisp_t dispex;
  
      DWORD length;
  } ArrayInstance;
  
  static const WCHAR lengthW[] = {'l','e','n','g','t','h',0};
  static const WCHAR concatW[] = {'c','o','n','c','a','t',0};
  static const WCHAR joinW[] = {'j','o','i','n',0};
  static const WCHAR popW[] = {'p','o','p',0};
  static const WCHAR pushW[] = {'p','u','s','h',0};
  static const WCHAR reverseW[] = {'r','e','v','e','r','s','e',0};
  static const WCHAR shiftW[] = {'s','h','i','f','t',0};
  static const WCHAR sliceW[] = {'s','l','i','c','e',0};
  static const WCHAR sortW[] = {'s','o','r','t',0};
  static const WCHAR spliceW[] = {'s','p','l','i','c','e',0};
  static const WCHAR toStringW[] = {'t','o','S','t','r','i','n','g',0};
  static const WCHAR toLocaleStringW[] = {'t','o','L','o','c','a','l','e','S','t','r','i','n','g',0};
  static const WCHAR unshiftW[] = {'u','n','s','h','i','f','t',0};
  
  static const WCHAR default_separatorW[] = {',',0};
  
  static inline ArrayInstance *array_from_jsdisp(jsdisp_t *jsdisp)
  {
      return CONTAINING_RECORD(jsdisp, ArrayInstance, dispex);
  }
  
  static inline ArrayInstance *array_from_vdisp(vdisp_t *vdisp)
  {
      return array_from_jsdisp(vdisp->u.jsdisp);
  }
  
  static inline ArrayInstance *array_this(vdisp_t *jsthis)
  {
      return is_vclass(jsthis, JSCLASS_ARRAY) ? array_from_vdisp(jsthis) : NULL;
  }
  
  unsigned array_get_length(jsdisp_t *array)
  {
      assert(is_class(array, JSCLASS_ARRAY));
      return array_from_jsdisp(array)->length;
  }
  
  static HRESULT get_length(script_ctx_t *ctx, vdisp_t *vdisp, jsdisp_t **jsthis, DWORD *ret)
  {
      ArrayInstance *array;
      jsval_t val;
      HRESULT hres;
  
      array = array_this(vdisp);
      if(array) {
          *jsthis = &array->dispex;
          *ret = array->length;
          return S_OK;
      }
  
      if(!is_jsdisp(vdisp))
          return throw_type_error(ctx, JS_E_JSCRIPT_EXPECTED, NULL);
  
      hres = jsdisp_propget_name(vdisp->u.jsdisp, lengthW, &val);
      if(FAILED(hres))
          return hres;
  
      hres = to_uint32(ctx, val, ret);
      jsval_release(val);
      if(FAILED(hres))
          return hres;
  
      *jsthis = vdisp->u.jsdisp;
      return S_OK;
  }
  
  static HRESULT set_length(jsdisp_t *obj, DWORD length)
  {
      if(is_class(obj, JSCLASS_ARRAY)) {
          array_from_jsdisp(obj)->length = length;
          return S_OK;
      }
  
      return jsdisp_propput_name(obj, lengthW, jsval_number(length));
  }
  
  static WCHAR *idx_to_str(DWORD idx, WCHAR *ptr)
  {
      if(!idx) {
          *ptr = '0';
          return ptr;
      }
  
      while(idx) {
          *ptr-- = '0' + (idx%10);
          idx /= 10;
      }
  
      return ptr+1;
  }
  
  static HRESULT Array_get_length(script_ctx_t *ctx, jsdisp_t *jsthis, jsval_t *r)
  {
      TRACE("%p\n", jsthis);
  
      *r = jsval_number(array_from_jsdisp(jsthis)->length);
      return S_OK;
  }
  
  static HRESULT Array_set_length(script_ctx_t *ctx, jsdisp_t *jsthis, jsval_t value)
  {
      ArrayInstance *This = array_from_jsdisp(jsthis);
      DOUBLE len = -1;
      DWORD i;
      HRESULT hres;
  
      TRACE("%p %d\n", This, This->length);
  
      hres = to_number(ctx, value, &len);
      if(FAILED(hres))
          return hres;
  
      len = floor(len);
      if(len!=(DWORD)len)
          return throw_range_error(ctx, JS_E_INVALID_LENGTH, NULL);
  
      for(i=len; i < This->length; i++) {
          hres = jsdisp_delete_idx(&This->dispex, i);
          if(FAILED(hres))
              return hres;
      }
  
      This->length = len;
      return S_OK;
  }
  
  static HRESULT concat_array(jsdisp_t *array, ArrayInstance *obj, DWORD *len)
  {
      jsval_t val;
      DWORD i;
      HRESULT hres;
  
      for(i=0; i < obj->length; i++) {
          hres = jsdisp_get_idx(&obj->dispex, i, &val);
          if(hres == DISP_E_UNKNOWNNAME)
              continue;
          if(FAILED(hres))
              return hres;
  
          hres = jsdisp_propput_idx(array, *len+i, val);
          jsval_release(val);
          if(FAILED(hres))
              return hres;
      }
  
      *len += obj->length;
      return S_OK;
  }
  
  static HRESULT concat_obj(jsdisp_t *array, IDispatch *obj, DWORD *len)
  {
      jsdisp_t *jsobj;
      HRESULT hres;
  
      jsobj = iface_to_jsdisp(obj);
      if(jsobj) {
          if(is_class(jsobj, JSCLASS_ARRAY)) {
              hres = concat_array(array, array_from_jsdisp(jsobj), len);
              jsdisp_release(jsobj);
              return hres;
          }
          jsdisp_release(jsobj);
      }
  
      return jsdisp_propput_idx(array, (*len)++, jsval_disp(obj));
  }
  
  static HRESULT Array_concat(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, jsval_t *argv,
          jsval_t *r)
  {
      jsdisp_t *ret;
      DWORD len = 0;
      HRESULT hres;
  
      TRACE("\n");
  
      hres = create_array(ctx, 0, &ret);
      if(FAILED(hres))
          return hres;
  
      hres = concat_obj(ret, jsthis->u.disp, &len);
      if(SUCCEEDED(hres)) {
          DWORD i;
  
          for(i=0; i < argc; i++) {
              if(is_object_instance(argv[i]))
                  hres = concat_obj(ret, get_object(argv[i]), &len);
              else
                  hres = jsdisp_propput_idx(ret, len++, argv[i]);
              if(FAILED(hres))
                  break;
          }
      }
  
      if(FAILED(hres))
          return hres;
  
      if(r)
          *r = jsval_obj(ret);
      else
          jsdisp_release(ret);
      return S_OK;
  }
  
  static HRESULT array_join(script_ctx_t *ctx, jsdisp_t *array, DWORD length, const WCHAR *sep,
          unsigned seplen, jsval_t *r)
  {
      jsstr_t **str_tab, *ret = NULL;
      jsval_t val;
      DWORD i;
      HRESULT hres = E_FAIL;
  
      if(!length) {
          if(r)
              *r = jsval_string(jsstr_empty());
          return S_OK;
      }
  
      str_tab = heap_alloc_zero(length * sizeof(*str_tab));
      if(!str_tab)
          return E_OUTOFMEMORY;
  
      for(i=0; i < length; i++) {
          hres = jsdisp_get_idx(array, i, &val);
          if(hres == DISP_E_UNKNOWNNAME) {
              hres = S_OK;
              continue;
          } else if(FAILED(hres))
              break;
  
          if(!is_undefined(val) && !is_null(val)) {
              hres = to_string(ctx, val, str_tab+i);
              jsval_release(val);
              if(FAILED(hres))
                  break;
          }
      }
  
      if(SUCCEEDED(hres)) {
          DWORD len = 0;
  
          if(str_tab[0])
              len = jsstr_length(str_tab[0]);
          for(i=1; i < length; i++) {
              len += seplen;
              if(str_tab[i])
                  len += jsstr_length(str_tab[i]);
              if(len > JSSTR_MAX_LENGTH) {
                  hres = E_OUTOFMEMORY;
                  break;
              }
          }
  
          if(SUCCEEDED(hres)) {
              WCHAR *ptr = NULL;
  
              ret = jsstr_alloc_buf(len, &ptr);
              if(ret) {
                  if(str_tab[0])
                      ptr += jsstr_flush(str_tab[0], ptr);
  
                  for(i=1; i < length; i++) {
                      if(seplen) {
                          memcpy(ptr, sep, seplen*sizeof(WCHAR));
                          ptr += seplen;
                      }
  
                      if(str_tab[i])
                          ptr += jsstr_flush(str_tab[i], ptr);
                  }
              }else {
                  hres = E_OUTOFMEMORY;
              }
          }
      }
  
      for(i=0; i < length; i++) {
          if(str_tab[i])
              jsstr_release(str_tab[i]);
      }
      heap_free(str_tab);
      if(FAILED(hres))
          return hres;
  
      TRACE("= %s\n", debugstr_jsstr(ret));
  
      if(r)
          *r = jsval_string(ret);
      else
          jsstr_release(ret);
      return S_OK;
  }
  
  /* ECMA-262 3rd Edition    15.4.4.5 */
  static HRESULT Array_join(script_ctx_t *ctx, vdisp_t *vthis, WORD flags, unsigned argc, jsval_t *argv,
          jsval_t *r)
  {
      jsdisp_t *jsthis;
      DWORD length;
      HRESULT hres;
  
      TRACE("\n");
  
      hres = get_length(ctx, vthis, &jsthis, &length);
      if(FAILED(hres))
          return hres;
  
      if(argc) {
          const WCHAR *sep;
          jsstr_t *sep_str;
  
          hres = to_flat_string(ctx, argv[0], &sep_str, &sep);
          if(FAILED(hres))
              return hres;
  
          hres = array_join(ctx, jsthis, length, sep, jsstr_length(sep_str), r);
  
          jsstr_release(sep_str);
      }else {
          hres = array_join(ctx, jsthis, length, default_separatorW, strlenW(default_separatorW), r);
      }
  
      return hres;
  }
  
  static HRESULT Array_pop(script_ctx_t *ctx, vdisp_t *vthis, WORD flags, unsigned argc, jsval_t *argv,
          jsval_t *r)
  {
      jsdisp_t *jsthis;
      jsval_t val;
      DWORD length;
      HRESULT hres;
  
      TRACE("\n");
  
      hres = get_length(ctx, vthis, &jsthis, &length);
      if(FAILED(hres))
          return hres;
  
      if(!length) {
          hres = set_length(jsthis, 0);
          if(FAILED(hres))
              return hres;
  
          if(r)
              *r = jsval_undefined();
          return S_OK;
      }
  
      length--;
      hres = jsdisp_get_idx(jsthis, length, &val);
      if(SUCCEEDED(hres))
          hres = jsdisp_delete_idx(jsthis, length);
      else if(hres == DISP_E_UNKNOWNNAME)
          val = jsval_undefined();
      else
          return hres;
  
      if(SUCCEEDED(hres))
          hres = set_length(jsthis, length);
  
      if(FAILED(hres)) {
          jsval_release(val);
          return hres;
      }
  
      if(r)
          *r = val;
      else
          jsval_release(val);
      return hres;
  }
  
  /* ECMA-262 3rd Edition    15.4.4.7 */
  static HRESULT Array_push(script_ctx_t *ctx, vdisp_t *vthis, WORD flags, unsigned argc, jsval_t *argv,
          jsval_t *r)
  {
      jsdisp_t *jsthis;
      DWORD length = 0;
      unsigned i;
      HRESULT hres;
  
      TRACE("\n");
  
      hres = get_length(ctx, vthis, &jsthis, &length);
      if(FAILED(hres))
          return hres;
  
      for(i=0; i < argc; i++) {
          hres = jsdisp_propput_idx(jsthis, length+i, argv[i]);
          if(FAILED(hres))
              return hres;
      }
  
      hres = set_length(jsthis, length+argc);
      if(FAILED(hres))
          return hres;
  
      if(r)
          *r = jsval_number(length+argc);
      return S_OK;
  }
  
  static HRESULT Array_reverse(script_ctx_t *ctx, vdisp_t *vthis, WORD flags, unsigned argc, jsval_t *argv,
          jsval_t *r)
  {
      jsdisp_t *jsthis;
      DWORD length, k, l;
      jsval_t v1, v2;
      HRESULT hres1, hres2;
  
      TRACE("\n");
  
      hres1 = get_length(ctx, vthis, &jsthis, &length);
      if(FAILED(hres1))
          return hres1;
  
      for(k=0; k<length/2; k++) {
          l = length-k-1;
  
          hres1 = jsdisp_get_idx(jsthis, k, &v1);
          if(FAILED(hres1) && hres1!=DISP_E_UNKNOWNNAME)
              return hres1;
  
          hres2 = jsdisp_get_idx(jsthis, l, &v2);
          if(FAILED(hres2) && hres2!=DISP_E_UNKNOWNNAME) {
              jsval_release(v1);
              return hres2;
          }
  
          if(hres1 == DISP_E_UNKNOWNNAME)
              hres1 = jsdisp_delete_idx(jsthis, l);
          else
              hres1 = jsdisp_propput_idx(jsthis, l, v1);
  
          if(FAILED(hres1)) {
              jsval_release(v1);
              jsval_release(v2);
              return hres1;
          }
  
          if(hres2 == DISP_E_UNKNOWNNAME)
              hres2 = jsdisp_delete_idx(jsthis, k);
          else
              hres2 = jsdisp_propput_idx(jsthis, k, v2);
  
          if(FAILED(hres2)) {
              jsval_release(v2);
              return hres2;
          }
      }
  
      if(r)
          *r = jsval_obj(jsdisp_addref(jsthis));
      return S_OK;
  }
  
  /* ECMA-262 3rd Edition    15.4.4.9 */
  static HRESULT Array_shift(script_ctx_t *ctx, vdisp_t *vthis, WORD flags, unsigned argc, jsval_t *argv,
          jsval_t *r)
  {
      jsdisp_t *jsthis;
      DWORD length = 0, i;
      jsval_t v, ret;
      HRESULT hres;
  
      TRACE("\n");
  
      hres = get_length(ctx, vthis, &jsthis, &length);
      if(FAILED(hres))
          return hres;
  
      if(!length) {
          hres = set_length(jsthis, 0);
          if(FAILED(hres))
              return hres;
  
          if(r)
              *r = jsval_undefined();
          return S_OK;
      }
  
      hres = jsdisp_get_idx(jsthis, 0, &ret);
      if(hres == DISP_E_UNKNOWNNAME) {
          ret = jsval_undefined();
          hres = S_OK;
      }
  
      for(i=1; SUCCEEDED(hres) && i<length; i++) {
          hres = jsdisp_get_idx(jsthis, i, &v);
          if(hres == DISP_E_UNKNOWNNAME)
              hres = jsdisp_delete_idx(jsthis, i-1);
          else if(SUCCEEDED(hres))
              hres = jsdisp_propput_idx(jsthis, i-1, v);
      }
  
      if(SUCCEEDED(hres)) {
          hres = jsdisp_delete_idx(jsthis, length-1);
          if(SUCCEEDED(hres))
              hres = set_length(jsthis, length-1);
      }
  
      if(FAILED(hres))
          return hres;
  
      if(r)
          *r = ret;
      else
          jsval_release(ret);
      return hres;
  }
  
  /* ECMA-262 3rd Edition    15.4.4.10 */
  static HRESULT Array_slice(script_ctx_t *ctx, vdisp_t *vthis, WORD flags, unsigned argc, jsval_t *argv, jsval_t *r)
  {
      jsdisp_t *arr, *jsthis;
      DOUBLE range;
      DWORD length, start, end, idx;
      HRESULT hres;
  
      TRACE("\n");
  
      hres = get_length(ctx, vthis, &jsthis, &length);
      if(FAILED(hres))
          return hres;
  
      if(argc) {
          hres = to_number(ctx, argv[0], &range);
          if(FAILED(hres))
              return hres;
  
          range = floor(range);
          if(-range>length || isnan(range)) start = 0;
          else if(range < 0) start = range+length;
          else if(range <= length) start = range;
          else start = length;
      }
      else start = 0;
  
      if(argc > 1) {
          hres = to_number(ctx, argv[1], &range);
          if(FAILED(hres))
              return hres;
  
          range = floor(range);
          if(-range>length) end = 0;
          else if(range < 0) end = range+length;
          else if(range <= length) end = range;
          else end = length;
      }
      else end = length;
  
      hres = create_array(ctx, (end>start)?end-start:0, &arr);
      if(FAILED(hres))
          return hres;
  
      for(idx=start; idx<end; idx++) {
          jsval_t v;
  
          hres = jsdisp_get_idx(jsthis, idx, &v);
          if(hres == DISP_E_UNKNOWNNAME)
              continue;
  
          if(SUCCEEDED(hres)) {
              hres = jsdisp_propput_idx(arr, idx-start, v);
              jsval_release(v);
          }
  
          if(FAILED(hres)) {
              jsdisp_release(arr);
              return hres;
          }
      }
  
      if(r)
          *r = jsval_obj(arr);
      else
          jsdisp_release(arr);
  
      return S_OK;
  }
  
  static HRESULT sort_cmp(script_ctx_t *ctx, jsdisp_t *cmp_func, jsval_t v1, jsval_t v2, INT *cmp)
  {
      HRESULT hres;
  
      if(cmp_func) {
          jsval_t args[2] = {v1, v2};
          jsval_t res;
          double n;
  
          hres = jsdisp_call_value(cmp_func, NULL, DISPATCH_METHOD, 2, args, &res);
          if(FAILED(hres))
              return hres;
  
          hres = to_number(ctx, res, &n);
          jsval_release(res);
          if(FAILED(hres))
              return hres;
  
          if(n == 0)
              *cmp = 0;
          *cmp = n > 0.0 ? 1 : -1;
      }else if(is_undefined(v1)) {
          *cmp = is_undefined(v2) ? 0 : 1;
      }else if(is_undefined(v2)) {
          *cmp = -1;
      }else if(is_number(v1) && is_number(v2)) {
          double d = get_number(v1)-get_number(v2);
          if(d > 0.0)
              *cmp = 1;
          else
              *cmp = d < -0.0 ? -1 : 0;
      }else {
          jsstr_t *x, *y;
  
          hres = to_string(ctx, v1, &x);
          if(FAILED(hres))
              return hres;
  
          hres = to_string(ctx, v2, &y);
          if(SUCCEEDED(hres)) {
              *cmp = jsstr_cmp(x, y);
              jsstr_release(y);
          }
          jsstr_release(x);
          if(FAILED(hres))
              return hres;
      }
  
      return S_OK;
  }
  
  /* ECMA-262 3rd Edition    15.4.4.11 */
  static HRESULT Array_sort(script_ctx_t *ctx, vdisp_t *vthis, WORD flags, unsigned argc, jsval_t *argv,
          jsval_t *r)
  {
      jsdisp_t *jsthis, *cmp_func = NULL;
      jsval_t *vtab, **sorttab = NULL;
      DWORD length;
      DWORD i;
      HRESULT hres = S_OK;
  
      TRACE("\n");
  
      hres = get_length(ctx, vthis, &jsthis, &length);
      if(FAILED(hres))
          return hres;
  
      if(argc > 1) {
          WARN("invalid arg_cnt %d\n", argc);
          return E_FAIL;
      }
  
      if(argc == 1) {
          if(!is_object_instance(argv[0])) {
              WARN("arg is not dispatch\n");
              return E_FAIL;
          }
  
          cmp_func = iface_to_jsdisp(get_object(argv[0]));
          if(!cmp_func || !is_class(cmp_func, JSCLASS_FUNCTION)) {
              WARN("cmp_func is not a function\n");
              if(cmp_func)
                  jsdisp_release(cmp_func);
              return E_FAIL;
          }
      }
  
      if(!length) {
          if(cmp_func)
              jsdisp_release(cmp_func);
          if(r)
              *r = jsval_obj(jsdisp_addref(jsthis));
          return S_OK;
      }
  
      vtab = heap_alloc_zero(length * sizeof(*vtab));
      if(vtab) {
          for(i=0; i<length; i++) {
              hres = jsdisp_get_idx(jsthis, i, vtab+i);
              if(hres == DISP_E_UNKNOWNNAME) {
                  vtab[i] = jsval_undefined();
                  hres = S_OK;
              } else if(FAILED(hres)) {
                  WARN("Could not get elem %d: %08x\n", i, hres);
                  break;
              }
          }
      }else {
          hres = E_OUTOFMEMORY;
      }
  
      if(SUCCEEDED(hres)) {
          sorttab = heap_alloc(length*2*sizeof(*sorttab));
          if(!sorttab)
              hres = E_OUTOFMEMORY;
      }
  
      /* merge-sort */
      if(SUCCEEDED(hres)) {
          jsval_t *tmpv, **tmpbuf;
          INT cmp;
  
          tmpbuf = sorttab + length;
          for(i=0; i < length; i++)
              sorttab[i] = vtab+i;
  
          for(i=0; i < length/2; i++) {
              hres = sort_cmp(ctx, cmp_func, *sorttab[2*i+1], *sorttab[2*i], &cmp);
              if(FAILED(hres))
                  break;
  
              if(cmp < 0) {
                  tmpv = sorttab[2*i];
                  sorttab[2*i] = sorttab[2*i+1];
                  sorttab[2*i+1] = tmpv;
              }
          }
  
          if(SUCCEEDED(hres)) {
              DWORD k, a, b, bend;
  
              for(k=2; k < length; k *= 2) {
                  for(i=0; i+k < length; i += 2*k) {
                      a = b = 0;
                      if(i+2*k <= length)
                          bend = k;
                      else
                          bend = length - (i+k);
  
                      memcpy(tmpbuf, sorttab+i, k*sizeof(jsval_t*));
  
                      while(a < k && b < bend) {
                          hres = sort_cmp(ctx, cmp_func, *tmpbuf[a], *sorttab[i+k+b], &cmp);
                          if(FAILED(hres))
                              break;
  
                          if(cmp < 0) {
                              sorttab[i+a+b] = tmpbuf[a];
                              a++;
                          }else {
                              sorttab[i+a+b] = sorttab[i+k+b];
                              b++;
                          }
                      }
  
                      if(FAILED(hres))
                          break;
  
                      if(a < k)
                          memcpy(sorttab+i+a+b, tmpbuf+a, (k-a)*sizeof(jsval_t*));
                  }
  
                  if(FAILED(hres))
                      break;
              }
          }
  
          for(i=0; SUCCEEDED(hres) && i < length; i++)
              hres = jsdisp_propput_idx(jsthis, i, *sorttab[i]);
      }
  
      if(vtab) {
          for(i=0; i < length; i++)
              jsval_release(vtab[i]);
          heap_free(vtab);
      }
      heap_free(sorttab);
      if(cmp_func)
          jsdisp_release(cmp_func);
  
      if(FAILED(hres))
          return hres;
  
      if(r)
          *r = jsval_obj(jsdisp_addref(jsthis));
      return S_OK;
  }
  
  /* ECMA-262 3rd Edition    15.4.4.12 */
  static HRESULT Array_splice(script_ctx_t *ctx, vdisp_t *vthis, WORD flags, unsigned argc, jsval_t *argv,
          jsval_t *r)
  {
      DWORD length, start=0, delete_cnt=0, i, add_args = 0;
      jsdisp_t *ret_array = NULL, *jsthis;
      jsval_t val;
      double d;
      int n;
      HRESULT hres = S_OK;
  
      TRACE("\n");
  
      hres = get_length(ctx, vthis, &jsthis, &length);
      if(FAILED(hres))
          return hres;
  
      if(argc) {
          hres = to_integer(ctx, argv[0], &d);
          if(FAILED(hres))
              return hres;
  
          if(is_int32(d)) {
              if((n = d) >= 0)
                  start = min(n, length);
              else
                  start = -n > length ? 0 : length + n;
          }else {
              start = d < 0.0 ? 0 : length;
          }
      }
  
      if(argc >= 2) {
          hres = to_integer(ctx, argv[1], &d);
          if(FAILED(hres))
              return hres;
  
          if(is_int32(d)) {
              if((n = d) > 0)
                  delete_cnt = min(n, length-start);
          }else if(d > 0.0) {
              delete_cnt = length-start;
          }
  
          add_args = argc-2;
      }
  
      if(r) {
          hres = create_array(ctx, 0, &ret_array);
          if(FAILED(hres))
              return hres;
  
          for(i=0; SUCCEEDED(hres) && i < delete_cnt; i++) {
              hres = jsdisp_get_idx(jsthis, start+i, &val);
              if(hres == DISP_E_UNKNOWNNAME) {
                  hres = S_OK;
              }else if(SUCCEEDED(hres)) {
                  hres = jsdisp_propput_idx(ret_array, i, val);
                  jsval_release(val);
              }
          }
  
          if(SUCCEEDED(hres))
              hres = jsdisp_propput_name(ret_array, lengthW, jsval_number(delete_cnt));
      }
  
      if(add_args < delete_cnt) {
          for(i = start; SUCCEEDED(hres) && i < length-delete_cnt; i++) {
              hres = jsdisp_get_idx(jsthis, i+delete_cnt, &val);
              if(hres == DISP_E_UNKNOWNNAME) {
                  hres = jsdisp_delete_idx(jsthis, i+add_args);
              }else if(SUCCEEDED(hres)) {
                  hres = jsdisp_propput_idx(jsthis, i+add_args, val);
                  jsval_release(val);
              }
          }
  
          for(i=length; SUCCEEDED(hres) && i != length-delete_cnt+add_args; i--)
              hres = jsdisp_delete_idx(jsthis, i-1);
      }else if(add_args > delete_cnt) {
          for(i=length-delete_cnt; SUCCEEDED(hres) && i != start; i--) {
              hres = jsdisp_get_idx(jsthis, i+delete_cnt-1, &val);
              if(hres == DISP_E_UNKNOWNNAME) {
                  hres = jsdisp_delete_idx(jsthis, i+add_args-1);
              }else if(SUCCEEDED(hres)) {
                  hres = jsdisp_propput_idx(jsthis, i+add_args-1, val);
                  jsval_release(val);
              }
          }
      }
  
      for(i=0; SUCCEEDED(hres) && i < add_args; i++)
          hres = jsdisp_propput_idx(jsthis, start+i, argv[i+2]);
  
      if(SUCCEEDED(hres))
          hres = jsdisp_propput_name(jsthis, lengthW, jsval_number(length-delete_cnt+add_args));
  
      if(FAILED(hres)) {
          if(ret_array)
              jsdisp_release(ret_array);
          return hres;
      }
  
      if(r)
          *r = jsval_obj(ret_array);
      return S_OK;
  }
  
  /* ECMA-262 3rd Edition    15.4.4.2 */
  static HRESULT Array_toString(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, jsval_t *argv,
          jsval_t *r)
  {
      ArrayInstance *array;
  
      TRACE("\n");
  
      array = array_this(jsthis);
      if(!array)
          return throw_type_error(ctx, JS_E_ARRAY_EXPECTED, NULL);
  
      return array_join(ctx, &array->dispex, array->length, default_separatorW,
                        strlenW(default_separatorW), r);
  }
  
  static HRESULT Array_toLocaleString(script_ctx_t *ctx, vdisp_t *vthis, WORD flags, unsigned argc, jsval_t *argv,
          jsval_t *r)
  {
      FIXME("\n");
      return E_NOTIMPL;
  }
  
  /* ECMA-262 3rd Edition    15.4.4.13 */
  static HRESULT Array_unshift(script_ctx_t *ctx, vdisp_t *vthis, WORD flags, unsigned argc, jsval_t *argv,
          jsval_t *r)
  {
      jsdisp_t *jsthis;
      WCHAR buf[14], *buf_end, *str;
      DWORD i, length;
      jsval_t val;
      DISPID id;
      HRESULT hres;
  
      TRACE("\n");
  
      hres = get_length(ctx, vthis, &jsthis, &length);
      if(FAILED(hres))
          return hres;
  
      if(argc) {
          buf_end = buf + sizeof(buf)/sizeof(WCHAR)-1;
          *buf_end-- = 0;
          i = length;
  
          while(i--) {
              str = idx_to_str(i, buf_end);
  
              hres = jsdisp_get_id(jsthis, str, 0, &id);
              if(SUCCEEDED(hres)) {
                  hres = jsdisp_propget(jsthis, id, &val);
                  if(FAILED(hres))
                      return hres;
  
                  hres = jsdisp_propput_idx(jsthis, i+argc, val);
                  jsval_release(val);
              }else if(hres == DISP_E_UNKNOWNNAME) {
                  hres = IDispatchEx_DeleteMemberByDispID(vthis->u.dispex, id);
              }
          }
  
          if(FAILED(hres))
              return hres;
      }
  
      for(i=0; i<argc; i++) {
          hres = jsdisp_propput_idx(jsthis, i, argv[i]);
          if(FAILED(hres))
              return hres;
      }
  
      if(argc) {
          length += argc;
          hres = set_length(jsthis, length);
          if(FAILED(hres))
              return hres;
      }
  
      if(r)
          *r = ctx->version < 2 ? jsval_undefined() : jsval_number(length);
      return S_OK;
  }
  
  static HRESULT Array_get_value(script_ctx_t *ctx, jsdisp_t *jsthis, jsval_t *r)
  {
      ArrayInstance *array = array_from_jsdisp(jsthis);
  
      TRACE("\n");
  
      return array_join(ctx, &array->dispex, array->length, default_separatorW,
                        strlenW(default_separatorW), r);
  }
  
  static void Array_destructor(jsdisp_t *dispex)
  {
      heap_free(dispex);
  }
  
  static void Array_on_put(jsdisp_t *dispex, const WCHAR *name)
  {
      ArrayInstance *array = array_from_jsdisp(dispex);
      const WCHAR *ptr = name;
      DWORD id = 0;
  
      if(!isdigitW(*ptr))
          return;
  
      while(*ptr && isdigitW(*ptr)) {
          id = id*10 + (*ptr-'0');
          ptr++;
      }
  
      if(*ptr)
          return;
  
      if(id >= array->length)
          array->length = id+1;
  }
  
  static const builtin_prop_t Array_props[] = {
      {concatW,                Array_concat,               PROPF_METHOD|1},
      {joinW,                  Array_join,                 PROPF_METHOD|1},
      {lengthW,                NULL,0,                     Array_get_length, Array_set_length},
      {popW,                   Array_pop,                  PROPF_METHOD},
      {pushW,                  Array_push,                 PROPF_METHOD|1},
      {reverseW,               Array_reverse,              PROPF_METHOD},
      {shiftW,                 Array_shift,                PROPF_METHOD},
      {sliceW,                 Array_slice,                PROPF_METHOD|2},
      {sortW,                  Array_sort,                 PROPF_METHOD|1},
      {spliceW,                Array_splice,               PROPF_METHOD|2},
      {toLocaleStringW,        Array_toLocaleString,       PROPF_METHOD},
      {toStringW,              Array_toString,             PROPF_METHOD},
      {unshiftW,               Array_unshift,              PROPF_METHOD|1},
  };
  
  static const builtin_info_t Array_info = {
      JSCLASS_ARRAY,
      {NULL, NULL,0, Array_get_value},
      sizeof(Array_props)/sizeof(*Array_props),
      Array_props,
      Array_destructor,
      Array_on_put
  };
  
  static const builtin_prop_t ArrayInst_props[] = {
      {lengthW,                NULL,0,                     Array_get_length, Array_set_length}
  };
  
  static const builtin_info_t ArrayInst_info = {
      JSCLASS_ARRAY,
      {NULL, NULL,0, Array_get_value},
      sizeof(ArrayInst_props)/sizeof(*ArrayInst_props),
      ArrayInst_props,
      Array_destructor,
      Array_on_put
  };
  
  static HRESULT ArrayConstr_value(script_ctx_t *ctx, vdisp_t *vthis, WORD flags, unsigned argc, jsval_t *argv,
          jsval_t *r)
  {
      jsdisp_t *obj;
      DWORD i;
      HRESULT hres;
  
      TRACE("\n");
  
      switch(flags) {
      case DISPATCH_METHOD:
      case DISPATCH_CONSTRUCT: {
          if(argc == 1 && is_number(argv[0])) {
              double n = get_number(argv[0]);
  
              if(n < 0 || !is_int32(n))
                  return throw_range_error(ctx, JS_E_INVALID_LENGTH, NULL);
  
              hres = create_array(ctx, n, &obj);
              if(FAILED(hres))
                  return hres;
  
              *r = jsval_obj(obj);
              return S_OK;
          }
  
          hres = create_array(ctx, argc, &obj);
          if(FAILED(hres))
              return hres;
  
          for(i=0; i < argc; i++) {
              hres = jsdisp_propput_idx(obj, i, argv[i]);
              if(FAILED(hres))
                  break;
          }
          if(FAILED(hres)) {
              jsdisp_release(obj);
              return hres;
          }
  
          *r = jsval_obj(obj);
          break;
      }
      default:
          FIXME("unimplemented flags: %x\n", flags);
          return E_NOTIMPL;
      }
  
      return S_OK;
  }
  
  static HRESULT alloc_array(script_ctx_t *ctx, jsdisp_t *object_prototype, ArrayInstance **ret)
  {
      ArrayInstance *array;
      HRESULT hres;
  
      array = heap_alloc_zero(sizeof(ArrayInstance));
      if(!array)
          return E_OUTOFMEMORY;
  
      if(object_prototype)
          hres = init_dispex(&array->dispex, ctx, &Array_info, object_prototype);
      else
          hres = init_dispex_from_constr(&array->dispex, ctx, &ArrayInst_info, ctx->array_constr);
  
      if(FAILED(hres)) {
          heap_free(array);
          return hres;
      }
  
      *ret = array;
      return S_OK;
  }
  
  HRESULT create_array_constr(script_ctx_t *ctx, jsdisp_t *object_prototype, jsdisp_t **ret)
  {
      ArrayInstance *array;
      HRESULT hres;
  
      static const WCHAR ArrayW[] = {'A','r','r','a','y',0};
  
      hres = alloc_array(ctx, object_prototype, &array);
      if(FAILED(hres))
          return hres;
  
      hres = create_builtin_constructor(ctx, ArrayConstr_value, ArrayW, NULL, PROPF_CONSTR|1, &array->dispex, ret);
  
      jsdisp_release(&array->dispex);
      return hres;
  }
  
  HRESULT create_array(script_ctx_t *ctx, DWORD length, jsdisp_t **ret)
  {
      ArrayInstance *array;
      HRESULT hres;
  
      hres = alloc_array(ctx, NULL, &array);
      if(FAILED(hres))
          return hres;
  
      array->length = length;
  
      *ret = &array->dispex;
      return S_OK;
  }
  