dlls/jscript/function.c

   1 /*
   2  * Copyright 2008 Jacek Caban for CodeWeavers
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  17  */
  18
  19 #include "jscript.h"
  20 #include "engine.h"
  21
  22 #include "wine/debug.h"
  23
  24 WINE_DEFAULT_DEBUG_CHANNEL(jscript);
  25
  26 typedef struct {
  27     DispatchEx dispex;
  28     builtin_invoke_t value_proc;
  29     const WCHAR *name;
  30     DWORD flags;
  31     source_elements_t *source;
  32     parameter_t *parameters;
  33     scope_chain_t *scope_chain;
  34     parser_ctx_t *parser;
  35     const WCHAR *src_str;
  36     DWORD src_len;
  37     DWORD length;
  38 } FunctionInstance;
  39
  40 static inline FunctionInstance *function_from_vdisp(vdisp_t *vdisp)
  41 {
  42     return (FunctionInstance*)vdisp->u.jsdisp;
  43 }
  44
  45 static inline FunctionInstance *function_this(vdisp_t *jsthis)
  46 {
  47     return is_vclass(jsthis, JSCLASS_FUNCTION) ? function_from_vdisp(jsthis) : NULL;
  48 }
  49
  50 static const WCHAR prototypeW[] = {'p','r','o','t','o','t', 'y', 'p','e',0};
  51
  52 static const WCHAR lengthW[] = {'l','e','n','g','t','h',0};
  53 static const WCHAR toStringW[] = {'t','o','S','t','r','i','n','g',0};
  54 static const WCHAR applyW[] = {'a','p','p','l','y',0};
  55 static const WCHAR callW[] = {'c','a','l','l',0};
  56
  57 static IDispatch *get_this(DISPPARAMS *dp)
  58 {
  59     DWORD i;
  60
  61     for(i=0; i < dp->cNamedArgs; i++) {
  62         if(dp->rgdispidNamedArgs[i] == DISPID_THIS) {
  63             if(V_VT(dp->rgvarg+i) == VT_DISPATCH)
  64                 return V_DISPATCH(dp->rgvarg+i);
  65
  66             WARN("This is not VT_DISPATCH\n");
  67             return NULL;
  68         }
  69     }
  70
  71     TRACE("no this passed\n");
  72     return NULL;
  73 }
  74
  75 static HRESULT init_parameters(DispatchEx *var_disp, FunctionInstance *function, DISPPARAMS *dp,
  76         jsexcept_t *ei, IServiceProvider *caller)
  77 {
  78     parameter_t *param;
  79     VARIANT var_empty;
  80     DWORD cargs, i=0;
  81     HRESULT hres;
  82
  83     V_VT(&var_empty) = VT_EMPTY;
  84     cargs = arg_cnt(dp);
  85
  86     for(param = function->parameters; param; param = param->next) {
  87         hres = jsdisp_propput_name(var_disp, param->identifier,
  88                 i < cargs ? get_arg(dp,i) : &var_empty, ei, caller);
  89         if(FAILED(hres))
  90             return hres;
  91
  92         i++;
  93     }
  94
  95     return S_OK;
  96 }
  97
  98 static HRESULT Arguments_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
  99         VARIANT *retv, jsexcept_t *ei, IServiceProvider *caller)
 100 {
 101     FIXME("\n");
 102     return E_NOTIMPL;
 103 }
 104
 105 static const builtin_info_t Arguments_info = {
 106     JSCLASS_ARGUMENTS,
 107     {NULL, Arguments_value, 0},
 108     0, NULL,
 109     NULL,
 110     NULL
 111 };
 112
 113 static HRESULT create_arguments(script_ctx_t *ctx, IDispatch *calee, DISPPARAMS *dp,
 114         jsexcept_t *ei, IServiceProvider *caller, DispatchEx **ret)
 115 {
 116     DispatchEx *args;
 117     VARIANT var;
 118     DWORD i;
 119     HRESULT hres;
 120
 121     static const WCHAR caleeW[] = {'c','a','l','l','e','e',0};
 122
 123     args = heap_alloc_zero(sizeof(DispatchEx));
 124     if(!args)
 125         return E_OUTOFMEMORY;
 126
 127     hres = init_dispex_from_constr(args, ctx, &Arguments_info, ctx->object_constr);
 128     if(FAILED(hres)) {
 129         heap_free(args);
 130         return hres;
 131     }
 132
 133     for(i=0; i < arg_cnt(dp); i++) {
 134         hres = jsdisp_propput_idx(args, i, get_arg(dp,i), ei, caller);
 135         if(FAILED(hres))
 136             break;
 137     }
 138
 139     if(SUCCEEDED(hres)) {
 140         V_VT(&var) = VT_I4;
 141         V_I4(&var) = arg_cnt(dp);
 142         hres = jsdisp_propput_name(args, lengthW, &var, ei, caller);
 143
 144         if(SUCCEEDED(hres)) {
 145             V_VT(&var) = VT_DISPATCH;
 146             V_DISPATCH(&var) = calee;
 147             hres = jsdisp_propput_name(args, caleeW, &var, ei, caller);
 148         }
 149     }
 150
 151     if(FAILED(hres)) {
 152         jsdisp_release(args);
 153         return hres;
 154     }
 155
 156     *ret = args;
 157     return S_OK;
 158 }
 159
 160 static HRESULT create_var_disp(script_ctx_t *ctx, FunctionInstance *function, DISPPARAMS *dp, jsexcept_t *ei,
 161                                IServiceProvider *caller, DispatchEx **ret)
 162 {
 163     DispatchEx *var_disp, *arg_disp;
 164     HRESULT hres;
 165
 166     static const WCHAR argumentsW[] = {'a','r','g','u','m','e','n','t','s',0};
 167
 168     hres = create_dispex(ctx, NULL, NULL, &var_disp);
 169     if(FAILED(hres))
 170         return hres;
 171
 172     hres = create_arguments(ctx, (IDispatch*)_IDispatchEx_(&function->dispex),
 173             dp, ei, caller, &arg_disp);
 174     if(SUCCEEDED(hres)) {
 175         VARIANT var;
 176
 177         V_VT(&var) = VT_DISPATCH;
 178         V_DISPATCH(&var) = (IDispatch*)_IDispatchEx_(arg_disp);
 179         hres = jsdisp_propput_name(var_disp, argumentsW, &var, ei, caller);
 180         jsdisp_release(arg_disp);
 181     }
 182
 183     if(SUCCEEDED(hres))
 184         hres = init_parameters(var_disp, function, dp, ei, caller);
 185     if(FAILED(hres)) {
 186         jsdisp_release(var_disp);
 187         return hres;
 188     }
 189
 190     *ret = var_disp;
 191     return S_OK;
 192 }
 193
 194 static HRESULT invoke_source(script_ctx_t *ctx, FunctionInstance *function, IDispatch *this_obj, DISPPARAMS *dp,
 195         VARIANT *retv, jsexcept_t *ei, IServiceProvider *caller)
 196 {
 197     DispatchEx *var_disp;
 198     exec_ctx_t *exec_ctx;
 199     scope_chain_t *scope;
 200     HRESULT hres;
 201
 202     if(!function->source) {
 203         FIXME("no source\n");
 204         return E_FAIL;
 205     }
 206
 207     hres = create_var_disp(ctx, function, dp, ei, caller, &var_disp);
 208     if(FAILED(hres))
 209         return hres;
 210
 211     hres = scope_push(function->scope_chain, var_disp, &scope);
 212     if(SUCCEEDED(hres)) {
 213         hres = create_exec_ctx(ctx, this_obj, var_disp, scope, &exec_ctx);
 214         scope_release(scope);
 215     }
 216     jsdisp_release(var_disp);
 217     if(FAILED(hres))
 218         return hres;
 219
 220     hres = exec_source(exec_ctx, function->parser, function->source, EXECT_FUNCTION, ei, retv);
 221     exec_release(exec_ctx);
 222
 223     return hres;
 224 }
 225
 226 static HRESULT invoke_constructor(script_ctx_t *ctx, FunctionInstance *function, DISPPARAMS *dp,
 227         VARIANT *retv, jsexcept_t *ei, IServiceProvider *caller)
 228 {
 229     DispatchEx *this_obj;
 230     VARIANT var;
 231     HRESULT hres;
 232
 233     hres = create_object(ctx, &function->dispex, &this_obj);
 234     if(FAILED(hres))
 235         return hres;
 236
 237     hres = invoke_source(ctx, function, (IDispatch*)_IDispatchEx_(this_obj), dp, &var, ei, caller);
 238     if(FAILED(hres)) {
 239         jsdisp_release(this_obj);
 240         return hres;
 241     }
 242
 243     V_VT(retv) = VT_DISPATCH;
 244     if(V_VT(&var) == VT_DISPATCH) {
 245         jsdisp_release(this_obj);
 246         V_DISPATCH(retv) = V_DISPATCH(&var);
 247     }else {
 248         VariantClear(&var);
 249         V_DISPATCH(retv) = (IDispatch*)_IDispatchEx_(this_obj);
 250     }
 251     return S_OK;
 252 }
 253
 254 static HRESULT invoke_value_proc(script_ctx_t *ctx, FunctionInstance *function, IDispatch *this_disp, WORD flags, DISPPARAMS *dp,
 255         VARIANT *retv, jsexcept_t *ei, IServiceProvider *caller)
 256 {
 257     vdisp_t vthis;
 258     HRESULT hres;
 259
 260     if(this_disp)
 261         set_disp(&vthis, this_disp);
 262     else if(ctx->host_global)
 263         set_disp(&vthis, ctx->host_global);
 264     else
 265         set_jsdisp(&vthis, ctx->global);
 266
 267     hres = function->value_proc(ctx, &vthis, flags, dp, retv, ei, caller);
 268
 269     vdisp_release(&vthis);
 270     return hres;
 271 }
 272
 273 static HRESULT call_function(script_ctx_t *ctx, FunctionInstance *function, IDispatch *this_obj, DISPPARAMS *args,
 274         VARIANT *retv, jsexcept_t *ei, IServiceProvider *caller)
 275 {
 276     if(function->value_proc)
 277         return invoke_value_proc(ctx, function, this_obj, DISPATCH_METHOD, args, retv, ei, caller);
 278
 279     return invoke_source(ctx, function, this_obj, args, retv, ei, caller);
 280 }
 281
 282 static HRESULT function_to_string(FunctionInstance *function, BSTR *ret)
 283 {
 284     BSTR str;
 285
 286     static const WCHAR native_prefixW[] = {'\n','f','u','n','c','t','i','o','n',' '};
 287     static const WCHAR native_suffixW[] =
 288         {'(',')',' ','{','\n',' ',' ',' ',' ','[','n','a','t','i','v','e',' ','c','o','d','e',']','\n','}','\n'};
 289
 290     if(function->value_proc) {
 291         DWORD name_len;
 292
 293         name_len = strlenW(function->name);
 294         str = SysAllocStringLen(NULL, sizeof(native_prefixW) + name_len*sizeof(WCHAR) + sizeof(native_suffixW));
 295         if(!str)
 296             return E_OUTOFMEMORY;
 297
 298         memcpy(str, native_prefixW, sizeof(native_prefixW));
 299         memcpy(str + sizeof(native_prefixW)/sizeof(WCHAR), function->name, name_len*sizeof(WCHAR));
 300         memcpy(str + sizeof(native_prefixW)/sizeof(WCHAR) + name_len, native_suffixW, sizeof(native_suffixW));
 301     }else {
 302         str = SysAllocStringLen(function->src_str, function->src_len);
 303         if(!str)
 304             return E_OUTOFMEMORY;
 305     }
 306
 307     *ret = str;
 308     return S_OK;
 309 }
 310
 311 static HRESULT Function_length(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
 312         VARIANT *retv, jsexcept_t *ei, IServiceProvider *sp)
 313 {
 314     FunctionInstance *This = function_from_vdisp(jsthis);
 315
 316     TRACE("%p %d\n", This, This->length);
 317
 318     switch(flags) {
 319     case DISPATCH_PROPERTYGET:
 320         V_VT(retv) = VT_I4;
 321         V_I4(retv) = This->length;
 322         break;
 323     default:
 324         FIXME("unimplemented flags %x\n", flags);
 325         return E_NOTIMPL;
 326     }
 327
 328     return S_OK;
 329 }
 330
 331 static HRESULT Function_toString(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
 332         VARIANT *retv, jsexcept_t *ei, IServiceProvider *sp)
 333 {
 334     FunctionInstance *function;
 335     BSTR str;
 336     HRESULT hres;
 337
 338     TRACE("\n");
 339
 340     if(!(function = function_this(jsthis)))
 341         return throw_type_error(ctx, ei, IDS_NOT_FUNC, NULL);
 342
 343     hres = function_to_string(function, &str);
 344     if(FAILED(hres))
 345         return hres;
 346
 347     if(retv) {
 348         V_VT(retv) = VT_BSTR;
 349         V_BSTR(retv) = str;
 350     }else {
 351         SysFreeString(str);
 352     }
 353     return S_OK;
 354 }
 355
 356 static HRESULT array_to_args(script_ctx_t *ctx, DispatchEx *arg_array, jsexcept_t *ei, IServiceProvider *caller,
 357         DISPPARAMS *args)
 358 {
 359     VARIANT var, *argv;
 360     DWORD length, i;
 361     HRESULT hres;
 362
 363     hres = jsdisp_propget_name(arg_array, lengthW, &var, ei, NULL/*FIXME*/);
 364     if(FAILED(hres))
 365         return hres;
 366
 367     hres = to_uint32(ctx, &var, ei, &length);
 368     VariantClear(&var);
 369     if(FAILED(hres))
 370         return hres;
 371
 372     argv = heap_alloc(length * sizeof(VARIANT));
 373     if(!argv)
 374         return E_OUTOFMEMORY;
 375
 376     for(i=0; i<length; i++) {
 377         hres = jsdisp_propget_idx(arg_array, i, argv+i, ei, caller);
 378         if(FAILED(hres)) {
 379             while(i--)
 380                 VariantClear(argv+i);
 381             heap_free(argv);
 382             return hres;
 383         }
 384     }
 385
 386     args->cArgs = length;
 387     args->rgvarg = argv;
 388     return S_OK;
 389 }
 390
 391 static HRESULT Function_apply(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
 392         VARIANT *retv, jsexcept_t *ei, IServiceProvider *caller)
 393 {
 394     FunctionInstance *function;
 395     DISPPARAMS args = {NULL,NULL,0,0};
 396     DWORD argc, i;
 397     IDispatch *this_obj = NULL;
 398     HRESULT hres = S_OK;
 399
 400     TRACE("\n");
 401
 402     if(!(function = function_this(jsthis)))
 403         return throw_type_error(ctx, ei, IDS_NOT_FUNC, NULL);
 404
 405     argc = arg_cnt(dp);
 406     if(argc) {
 407         VARIANT *v = get_arg(dp,0);
 408
 409         if(V_VT(v) != VT_EMPTY && V_VT(v) != VT_NULL) {
 410             hres = to_object(ctx, v, &this_obj);
 411             if(FAILED(hres))
 412                 return hres;
 413         }
 414     }
 415
 416     if(argc >= 2) {
 417         DispatchEx *arg_array = NULL;
 418
 419         if(V_VT(get_arg(dp,1)) == VT_DISPATCH) {
 420             arg_array = iface_to_jsdisp((IUnknown*)V_DISPATCH(get_arg(dp,1)));
 421             if(arg_array &&
 422                (!is_class(arg_array, JSCLASS_ARRAY) && !is_class(arg_array, JSCLASS_ARGUMENTS) )) {
 423                 jsdisp_release(arg_array);
 424                 arg_array = NULL;
 425             }
 426         }
 427
 428         if(arg_array) {
 429             hres = array_to_args(ctx, arg_array, ei, caller, &args);
 430             jsdisp_release(arg_array);
 431         }else {
 432             FIXME("throw TypeError\n");
 433             hres = E_FAIL;
 434         }
 435     }
 436
 437     hres = call_function(ctx, function, this_obj, &args, retv, ei, caller);
 438
 439     if(this_obj)
 440         IDispatch_Release(this_obj);
 441     for(i=0; i<args.cArgs; i++)
 442         VariantClear(args.rgvarg+i);
 443     heap_free(args.rgvarg);
 444     return hres;
 445 }
 446
 447 static HRESULT Function_call(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
 448         VARIANT *retv, jsexcept_t *ei, IServiceProvider *caller)
 449 {
 450     FunctionInstance *function;
 451     DISPPARAMS args = {NULL,NULL,0,0};
 452     IDispatch *this_obj = NULL;
 453     DWORD argc;
 454     HRESULT hres;
 455
 456     TRACE("\n");
 457
 458     if(!(function = function_this(jsthis)))
 459         return throw_type_error(ctx, ei, IDS_NOT_FUNC, NULL);
 460
 461     argc = arg_cnt(dp);
 462     if(argc) {
 463         VARIANT *v = get_arg(dp,0);
 464
 465         if(V_VT(v) != VT_EMPTY && V_VT(v) != VT_NULL) {
 466             hres = to_object(ctx, v, &this_obj);
 467             if(FAILED(hres))
 468                 return hres;
 469         }
 470
 471         args.cArgs = argc-1;
 472     }
 473
 474     if(args.cArgs)
 475         args.rgvarg = dp->rgvarg + dp->cArgs - args.cArgs-1;
 476
 477     hres = call_function(ctx, function, this_obj, &args, retv, ei, caller);
 478
 479     if(this_obj)
 480         IDispatch_Release(this_obj);
 481     return hres;
 482 }
 483
 484 HRESULT Function_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
 485         VARIANT *retv, jsexcept_t *ei, IServiceProvider *caller)
 486 {
 487     FunctionInstance *function;
 488
 489     TRACE("\n");
 490
 491     if(!is_vclass(jsthis, JSCLASS_FUNCTION)) {
 492         ERR("dispex is not a function\n");
 493         return E_FAIL;
 494     }
 495
 496     function = (FunctionInstance*)jsthis->u.jsdisp;
 497
 498     switch(flags) {
 499     case DISPATCH_METHOD:
 500         if(function->value_proc)
 501             return invoke_value_proc(ctx, function, get_this(dp), flags, dp, retv, ei, caller);
 502
 503         return invoke_source(ctx, function, get_this(dp), dp, retv, ei, caller);
 504
 505     case DISPATCH_PROPERTYGET: {
 506         HRESULT hres;
 507         BSTR str;
 508
 509         hres = function_to_string(function, &str);
 510         if(FAILED(hres))
 511             return hres;
 512
 513         V_VT(retv) = VT_BSTR;
 514         V_BSTR(retv) = str;
 515         break;
 516     }
 517
 518     case DISPATCH_CONSTRUCT:
 519         if(function->value_proc)
 520             return invoke_value_proc(ctx, function, get_this(dp), flags, dp, retv, ei, caller);
 521
 522         return invoke_constructor(ctx, function, dp, retv, ei, caller);
 523
 524     default:
 525         FIXME("not implemented flags %x\n", flags);
 526         return E_NOTIMPL;
 527     }
 528
 529     return S_OK;
 530 }
 531
 532 static void Function_destructor(DispatchEx *dispex)
 533 {
 534     FunctionInstance *This = (FunctionInstance*)dispex;
 535
 536     if(This->parser)
 537         parser_release(This->parser);
 538     if(This->scope_chain)
 539         scope_release(This->scope_chain);
 540     heap_free(This);
 541 }
 542
 543 static const builtin_prop_t Function_props[] = {
 544     {applyW,                 Function_apply,                 PROPF_METHOD|2},
 545     {callW,                  Function_call,                  PROPF_METHOD|1},
 546     {lengthW,                Function_length,                0},
 547     {toStringW,              Function_toString,              PROPF_METHOD}
 548 };
 549
 550 static const builtin_info_t Function_info = {
 551     JSCLASS_FUNCTION,
 552     {NULL, Function_value, 0},
 553     sizeof(Function_props)/sizeof(*Function_props),
 554     Function_props,
 555     Function_destructor,
 556     NULL
 557 };
 558
 559 static HRESULT create_function(script_ctx_t *ctx, const builtin_info_t *builtin_info, DWORD flags,
 560         BOOL funcprot, DispatchEx *prototype, FunctionInstance **ret)
 561 {
 562     FunctionInstance *function;
 563     HRESULT hres;
 564
 565     function = heap_alloc_zero(sizeof(FunctionInstance));
 566     if(!function)
 567         return E_OUTOFMEMORY;
 568
 569     if(funcprot)
 570         hres = init_dispex(&function->dispex, ctx, &Function_info, prototype);
 571     else if(builtin_info)
 572         hres = init_dispex_from_constr(&function->dispex, ctx, builtin_info, ctx->function_constr);
 573     else
 574         hres = init_dispex_from_constr(&function->dispex, ctx, &Function_info, ctx->function_constr);
 575     if(FAILED(hres))
 576         return hres;
 577
 578     function->flags = flags;
 579     function->length = flags & PROPF_ARGMASK;
 580
 581     *ret = function;
 582     return S_OK;
 583 }
 584
 585 static HRESULT set_prototype(script_ctx_t *ctx, DispatchEx *dispex, DispatchEx *prototype)
 586 {
 587     jsexcept_t jsexcept;
 588     VARIANT var;
 589
 590     V_VT(&var) = VT_DISPATCH;
 591     V_DISPATCH(&var) = (IDispatch*)_IDispatchEx_(prototype);
 592     memset(&jsexcept, 0, sizeof(jsexcept));
 593
 594     return jsdisp_propput_name(dispex, prototypeW, &var, &jsexcept, NULL/*FIXME*/);
 595 }
 596
 597 HRESULT create_builtin_function(script_ctx_t *ctx, builtin_invoke_t value_proc, const WCHAR *name,
 598         const builtin_info_t *builtin_info, DWORD flags, DispatchEx *prototype, DispatchEx **ret)
 599 {
 600     FunctionInstance *function;
 601     HRESULT hres;
 602
 603     hres = create_function(ctx, builtin_info, flags, FALSE, NULL, &function);
 604     if(FAILED(hres))
 605         return hres;
 606
 607     hres = set_prototype(ctx, &function->dispex, prototype);
 608     if(FAILED(hres)) {
 609         jsdisp_release(&function->dispex);
 610         return hres;
 611     }
 612
 613     function->value_proc = value_proc;
 614     function->name = name;
 615
 616     *ret = &function->dispex;
 617     return S_OK;
 618 }
 619
 620 HRESULT create_source_function(parser_ctx_t *ctx, parameter_t *parameters, source_elements_t *source,
 621         scope_chain_t *scope_chain, const WCHAR *src_str, DWORD src_len, DispatchEx **ret)
 622 {
 623     FunctionInstance *function;
 624     DispatchEx *prototype;
 625     parameter_t *iter;
 626     DWORD length = 0;
 627     HRESULT hres;
 628
 629     hres = create_object(ctx->script, NULL, &prototype);
 630     if(FAILED(hres))
 631         return hres;
 632
 633     hres = create_function(ctx->script, NULL, PROPF_CONSTR, FALSE, NULL, &function);
 634     if(SUCCEEDED(hres)) {
 635         hres = set_prototype(ctx->script, &function->dispex, prototype);
 636         if(FAILED(hres))
 637             jsdisp_release(&function->dispex);
 638     }
 639     jsdisp_release(prototype);
 640     if(FAILED(hres))
 641         return hres;
 642
 643     function->source = source;
 644     function->parameters = parameters;
 645
 646     if(scope_chain) {
 647         scope_addref(scope_chain);
 648         function->scope_chain = scope_chain;
 649     }
 650
 651     parser_addref(ctx);
 652     function->parser = ctx;
 653
 654     for(iter = parameters; iter; iter = iter->next)
 655         length++;
 656     function->length = length;
 657
 658     function->src_str = src_str;
 659     function->src_len = src_len;
 660
 661     *ret = &function->dispex;
 662     return S_OK;
 663 }
 664
 665 static HRESULT construct_function(script_ctx_t *ctx, DISPPARAMS *dp, jsexcept_t *ei, IDispatch **ret)
 666 {
 667     function_expression_t *expr;
 668     WCHAR *str = NULL, *ptr;
 669     DWORD argc, len = 0, l;
 670     parser_ctx_t *parser;
 671     DispatchEx *function;
 672     BSTR *params = NULL;
 673     int i=0, j=0;
 674     HRESULT hres = S_OK;
 675
 676     static const WCHAR function_anonymousW[] = {'f','u','n','c','t','i','o','n',' ','a','n','o','n','y','m','o','u','s','('};
 677     static const WCHAR function_beginW[] = {')',' ','{','\n'};
 678     static const WCHAR function_endW[] = {'\n','}',0};
 679
 680     argc = arg_cnt(dp);
 681     if(argc) {
 682         params = heap_alloc(argc*sizeof(BSTR));
 683         if(!params)
 684             return E_OUTOFMEMORY;
 685
 686         if(argc > 2)
 687             len = (argc-2)*2; /* separating commas */
 688         for(i=0; i < argc; i++) {
 689             hres = to_string(ctx, get_arg(dp,i), ei, params+i);
 690             if(FAILED(hres))
 691                 break;
 692             len += SysStringLen(params[i]);
 693         }
 694     }
 695
 696     if(SUCCEEDED(hres)) {
 697         len += (sizeof(function_anonymousW) + sizeof(function_beginW) + sizeof(function_endW)) / sizeof(WCHAR);
 698         str = heap_alloc(len*sizeof(WCHAR));
 699         if(str) {
 700             memcpy(str, function_anonymousW, sizeof(function_anonymousW));
 701             ptr = str + sizeof(function_anonymousW)/sizeof(WCHAR);
 702             if(argc > 1) {
 703                 while(1) {
 704                     l = SysStringLen(params[j]);
 705                     memcpy(ptr, params[j], l*sizeof(WCHAR));
 706                     ptr += l;
 707                     if(++j == argc-1)
 708                         break;
 709                     *ptr++ = ',';
 710                     *ptr++ = ' ';
 711                 }
 712             }
 713             memcpy(ptr, function_beginW, sizeof(function_beginW));
 714             ptr += sizeof(function_beginW)/sizeof(WCHAR);
 715             if(argc) {
 716                 l = SysStringLen(params[argc-1]);
 717                 memcpy(ptr, params[argc-1], l*sizeof(WCHAR));
 718                 ptr += l;
 719             }
 720             memcpy(ptr, function_endW, sizeof(function_endW));
 721
 722             TRACE("%s\n", debugstr_w(str));
 723         }else {
 724             hres = E_OUTOFMEMORY;
 725         }
 726     }
 727
 728     while(--i >= 0)
 729         SysFreeString(params[i]);
 730     heap_free(params);
 731     if(FAILED(hres))
 732         return hres;
 733
 734     hres = script_parse(ctx, str, NULL, &parser);
 735     heap_free(str);
 736     if(FAILED(hres))
 737         return hres;
 738
 739     if(!parser->source || !parser->source->functions || parser->source->functions->next || parser->source->variables) {
 740         ERR("Invalid parser result!\n");
 741         parser_release(parser);
 742         return E_UNEXPECTED;
 743     }
 744     expr = parser->source->functions->expr;
 745
 746     hres = create_source_function(parser, expr->parameter_list, expr->source_elements, NULL, expr->src_str,
 747             expr->src_len, &function);
 748     parser_release(parser);
 749     if(FAILED(hres))
 750         return hres;
 751
 752     *ret = (IDispatch*)_IDispatchEx_(function);
 753     return S_OK;
 754 }
 755
 756 static HRESULT FunctionConstr_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
 757         VARIANT *retv, jsexcept_t *ei, IServiceProvider *sp)
 758 {
 759     HRESULT hres;
 760
 761     TRACE("\n");
 762
 763     switch(flags) {
 764     case DISPATCH_CONSTRUCT: {
 765         IDispatch *ret;
 766
 767         hres = construct_function(ctx, dp, ei, &ret);
 768         if(FAILED(hres))
 769             return hres;
 770
 771         V_VT(retv) = VT_DISPATCH;
 772         V_DISPATCH(retv) = ret;
 773         break;
 774     }
 775     default:
 776         FIXME("unimplemented flags %x\n", flags);
 777         return E_NOTIMPL;
 778     }
 779
 780     return S_OK;
 781 }
 782
 783 static HRESULT FunctionProt_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
 784         VARIANT *retv, jsexcept_t *ei, IServiceProvider *sp)
 785 {
 786     FIXME("\n");
 787     return E_NOTIMPL;
 788 }
 789
 790 HRESULT init_function_constr(script_ctx_t *ctx, DispatchEx *object_prototype)
 791 {
 792     FunctionInstance *prot, *constr;
 793     HRESULT hres;
 794
 795     static const WCHAR FunctionW[] = {'F','u','n','c','t','i','o','n',0};
 796
 797     hres = create_function(ctx, NULL, PROPF_CONSTR, TRUE, object_prototype, &prot);
 798     if(FAILED(hres))
 799         return hres;
 800
 801     prot->value_proc = FunctionProt_value;
 802     prot->name = prototypeW;
 803
 804     hres = create_function(ctx, NULL, PROPF_CONSTR|1, TRUE, &prot->dispex, &constr);
 805     if(SUCCEEDED(hres)) {
 806         constr->value_proc = FunctionConstr_value;
 807         constr->name = FunctionW;
 808         hres = set_prototype(ctx, &constr->dispex, &prot->dispex);
 809         if(FAILED(hres))
 810             jsdisp_release(&constr->dispex);
 811     }
 812     jsdisp_release(&prot->dispex);
 813     if(FAILED(hres))
 814         return hres;
 815
 816     ctx->function_constr = &constr->dispex;
 817     return S_OK;
 818 }