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# array_object.cpp

    00001 // -*- c-basic-offset: 2 -*-
    00002 /*
    00003  *  This file is part of the KDE libraries
    00004  *  Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
    00005  *  Copyright (C) 2003 Apple Computer, Inc.
    00006  *
    00007  *  This library is free software; you can redistribute it and/or
    00008  *  modify it under the terms of the GNU Lesser General Public
    00009  *  License as published by the Free Software Foundation; either
    00010  *  version 2 of the License, or (at your option) any later version.
    00011  *
    00012  *  This library is distributed in the hope that it will be useful,
    00013  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
    00014  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    00015  *  Lesser General Public License for more details.
    00016  *
    00017  *  You should have received a copy of the GNU Lesser General Public
    00018  *  License along with this library; if not, write to the Free Software
    00019  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
    00020  *
    00021  */
    00022
    00023 #include "value.h"
    00024 #include "object.h"
    00025 #include "types.h"
    00026 #include "interpreter.h"
    00027 #include "operations.h"
    00028 #include "array_object.h"
    00029 #include "internal.h"
    00030 #include "error_object.h"
    00031
    00032 #include "array_object.lut.h"
    00033
    00034 #include <stdio.h>
    00035 #include <string.h>
    00036 #include <assert.h>
    00037
    00038 #define MAX_INDEX 4294967294U // 2^32-2
    00039
    00040 using namespace KJS;
    00041
    00042 // ------------------------------ ArrayInstanceImp -----------------------------
    00043
    00044 const unsigned sparseArrayCutoff = 10000;
    00045
    00046 const ClassInfo ArrayInstanceImp::info = {"Array", 0, 0, 0};
    00047
    00048 ArrayInstanceImp::ArrayInstanceImp(ObjectImp *proto, unsigned initialLength)
    00049   : ObjectImp(proto)
    00050   , length(initialLength)
    00051   , storageLength(initialLength < sparseArrayCutoff ? initialLength : 0)
    00052   , capacity(storageLength)
    00053   , storage(capacity ? (ValueImp **)calloc(capacity, sizeof(ValueImp *)) : 0)
    00054 {
    00055 }
    00056
    00057 ArrayInstanceImp::ArrayInstanceImp(ObjectImp *proto, const List &list)
    00058   : ObjectImp(proto)
    00059   , length(list.size())
    00060   , storageLength(length)
    00061   , capacity(storageLength)
    00062   , storage(capacity ? (ValueImp **)malloc(sizeof(ValueImp *) * capacity) : 0)
    00063 {
    00064   ListIterator it = list.begin();
    00065   unsigned l = length;
    00066   for (unsigned i = 0; i < l; ++i) {
    00067     storage[i] = (it++).imp();
    00068   }
    00069 }
    00070
    00071 ArrayInstanceImp::~ArrayInstanceImp()
    00072 {
    00073   free(storage);
    00074 }
    00075
    00076 Value ArrayInstanceImp::get(ExecState *exec, const Identifier &propertyName) const
    00077 {
    00078   if (propertyName == lengthPropertyName)
    00079     return Number(length);
    00080
    00081   bool ok;
    00082   unsigned index = propertyName.toArrayIndex(&ok);
    00083   if (ok) {
    00084     if (index >= length)
    00085       return Undefined();
    00086     if (index < storageLength) {
    00087       ValueImp *v = storage[index];
    00088       return v ? Value(v) : Undefined();
    00089     }
    00090   }
    00091
    00092   return ObjectImp::get(exec, propertyName);
    00093 }
    00094
    00095 Value ArrayInstanceImp::getPropertyByIndex(ExecState *exec,
    00096                        unsigned index) const
    00097 {
    00098   if (index > MAX_INDEX)
    00099     return ObjectImp::get(exec, Identifier::from(index));
    00100   if (index >= length)
    00101     return Undefined();
    00102   if (index < storageLength) {
    00103     ValueImp *v = storage[index];
    00104     return v ? Value(v) : Undefined();
    00105   }
    00106
    00107   return ObjectImp::get(exec, Identifier::from(index));
    00108 }
    00109
    00110 // Special implementation of [[Put]] - see ECMA 15.4.5.1
    00111 void ArrayInstanceImp::put(ExecState *exec, const Identifier &propertyName, const Value &value, int attr)
    00112 {
    00113   if (propertyName == lengthPropertyName) {
    00114     unsigned int newLen = value.toUInt32(exec);
    00115     if (value.toNumber(exec) != double(newLen)) {
    00116       Object err = Error::create(exec, RangeError, "Invalid array length.");
    00117       exec->setException(err);
    00118       return;
    00119     }
    00120     setLength(newLen, exec);
    00121     return;
    00122   }
    00123
    00124   bool ok;
    00125   unsigned index = propertyName.toArrayIndex(&ok);
    00126   if (ok) {
    00127     putPropertyByIndex(exec, index, value, attr);
    00128     return;
    00129   }
    00130
    00131   ObjectImp::put(exec, propertyName, value, attr);
    00132 }
    00133
    00134 void ArrayInstanceImp::putPropertyByIndex(ExecState *exec, unsigned index,
    00135                       const Value &value, int attr)
    00136 {
    00137   if (index < sparseArrayCutoff && index >= storageLength) {
    00138     resizeStorage(index + 1);
    00139   }
    00140
    00141   if (index >= length && index <= MAX_INDEX) {
    00142     length = index + 1;
    00143   }
    00144
    00145   if (index < storageLength) {
    00146     storage[index] = value.imp();
    00147     return;
    00148   }
    00149
    00150   assert(index >= sparseArrayCutoff);
    00151   ObjectImp::put(exec, Identifier::from(index), value, attr);
    00152 }
    00153
    00154 bool ArrayInstanceImp::hasProperty(ExecState *exec, const Identifier &propertyName) const
    00155 {
    00156   if (propertyName == lengthPropertyName)
    00157     return true;
    00158
    00159   bool ok;
    00160   unsigned index = propertyName.toArrayIndex(&ok);
    00161   if (ok) {
    00162     if (index >= length)
    00163       return false;
    00164     if (index < storageLength) {
    00165       ValueImp *v = storage[index];
    00166       return v && v != UndefinedImp::staticUndefined;
    00167     }
    00168   }
    00169
    00170   return ObjectImp::hasProperty(exec, propertyName);
    00171 }
    00172
    00173 bool ArrayInstanceImp::hasPropertyByIndex(ExecState *exec, unsigned index) const
    00174 {
    00175   if (index > MAX_INDEX)
    00176     return ObjectImp::hasProperty(exec, Identifier::from(index));
    00177   if (index >= length)
    00178     return false;
    00179   if (index < storageLength) {
    00180     ValueImp *v = storage[index];
    00181     return v && v != UndefinedImp::staticUndefined;
    00182   }
    00183
    00184   return ObjectImp::hasProperty(exec, Identifier::from(index));
    00185 }
    00186
    00187 bool ArrayInstanceImp::deleteProperty(ExecState *exec, const Identifier &propertyName)
    00188 {
    00189   if (propertyName == lengthPropertyName)
    00190     return false;
    00191
    00192   bool ok;
    00193   unsigned index = propertyName.toArrayIndex(&ok);
    00194   if (ok) {
    00195     if (index >= length)
    00196       return true;
    00197     if (index < storageLength) {
    00198       storage[index] = 0;
    00199       return true;
    00200     }
    00201   }
    00202
    00203   return ObjectImp::deleteProperty(exec, propertyName);
    00204 }
    00205
    00206 bool ArrayInstanceImp::deletePropertyByIndex(ExecState *exec, unsigned index)
    00207 {
    00208   if (index > MAX_INDEX)
    00209     return ObjectImp::deleteProperty(exec, Identifier::from(index));
    00210   if (index >= length)
    00211     return true;
    00212   if (index < storageLength) {
    00213     storage[index] = 0;
    00214     return true;
    00215   }
    00216
    00217   return ObjectImp::deleteProperty(exec, Identifier::from(index));
    00218 }
    00219
    00220 ReferenceList ArrayInstanceImp::propList(ExecState *exec, bool recursive)
    00221 {
    00222   ReferenceList properties = ObjectImp::propList(exec,recursive);
    00223
    00224   // avoid fetching this every time through the loop
    00225   ValueImp *undefined = UndefinedImp::staticUndefined;
    00226
    00227   for (unsigned i = 0; i < storageLength; ++i) {
    00228     ValueImp *imp = storage[i];
    00229     if (imp && imp != undefined && !ObjectImp::hasProperty(exec,Identifier::from(i))) {
    00230       properties.append(Reference(this, i));
    00231     }
    00232   }
    00233   return properties;
    00234 }
    00235
    00236 void ArrayInstanceImp::resizeStorage(unsigned newLength)
    00237 {
    00238     if (newLength < storageLength) {
    00239       memset(storage + newLength, 0, sizeof(ValueImp *) * (storageLength - newLength));
    00240     }
    00241     if (newLength > capacity) {
    00242       unsigned newCapacity;
    00243       if (newLength > sparseArrayCutoff) {
    00244         newCapacity = newLength;
    00245       } else {
    00246         newCapacity = (newLength * 3 + 1) / 2;
    00247         if (newCapacity > sparseArrayCutoff) {
    00248           newCapacity = sparseArrayCutoff;
    00249         }
    00250       }
    00251       storage = (ValueImp **)realloc(storage, newCapacity * sizeof (ValueImp *));
    00252       memset(storage + capacity, 0, sizeof(ValueImp *) * (newCapacity - capacity));
    00253       capacity = newCapacity;
    00254     }
    00255     storageLength = newLength;
    00256 }
    00257
    00258 void ArrayInstanceImp::setLength(unsigned newLength, ExecState *exec)
    00259 {
    00260   if (newLength <= storageLength) {
    00261     resizeStorage(newLength);
    00262   }
    00263
    00264   if (newLength < length) {
    00265     ReferenceList sparseProperties;
    00266
    00267     _prop.addSparseArrayPropertiesToReferenceList(sparseProperties, Object(this));
    00268
    00269     ReferenceListIterator it = sparseProperties.begin();
    00270     while (it != sparseProperties.end()) {
    00271       Reference ref = it++;
    00272       bool ok;
    00273       unsigned index = ref.getPropertyName(exec).toArrayIndex(&ok);
    00274       if (ok && index > newLength) {
    00275     ref.deleteValue(exec);
    00276       }
    00277     }
    00278   }
    00279
    00280   length = newLength;
    00281 }
    00282
    00283 void ArrayInstanceImp::mark()
    00284 {
    00285   ObjectImp::mark();
    00286   unsigned l = storageLength;
    00287   for (unsigned i = 0; i < l; ++i) {
    00288     ValueImp *imp = storage[i];
    00289     if (imp && !imp->marked())
    00290       imp->mark();
    00291   }
    00292 }
    00293
    00294 static ExecState *execForCompareByStringForQSort;
    00295
    00296 static int compareByStringForQSort(const void *a, const void *b)
    00297 {
    00298     ExecState *exec = execForCompareByStringForQSort;
    00299     ValueImp *va = *(ValueImp **)a;
    00300     ValueImp *vb = *(ValueImp **)b;
    00301     if (va->dispatchType() == UndefinedType) {
    00302         return vb->dispatchType() == UndefinedType ? 0 : 1;
    00303     }
    00304     if (vb->dispatchType() == UndefinedType) {
    00305         return -1;
    00306     }
    00307     return compare(va->dispatchToString(exec), vb->dispatchToString(exec));
    00308 }
    00309
    00310 void ArrayInstanceImp::sort(ExecState *exec)
    00311 {
    00312     int lengthNotIncludingUndefined = pushUndefinedObjectsToEnd(exec);
    00313
    00314     execForCompareByStringForQSort = exec;
    00315     qsort(storage, lengthNotIncludingUndefined, sizeof(ValueImp *), compareByStringForQSort);
    00316     execForCompareByStringForQSort = 0;
    00317 }
    00318
    00319 namespace KJS {
    00320
    00321 struct CompareWithCompareFunctionArguments {
    00322     CompareWithCompareFunctionArguments(ExecState *e, ObjectImp *cf)
    00323         : exec(e)
    00324         , compareFunction(cf)
    00325         , globalObject(e->interpreter()->globalObject())
    00326     {
    00327         arguments.append(Undefined());
    00328         arguments.append(Undefined());
    00329     }
    00330
    00331     ExecState *exec;
    00332     ObjectImp *compareFunction;
    00333     List arguments;
    00334     Object globalObject;
    00335 };
    00336
    00337 }
    00338
    00339 static CompareWithCompareFunctionArguments *compareWithCompareFunctionArguments;
    00340
    00341 static int compareWithCompareFunctionForQSort(const void *a, const void *b)
    00342 {
    00343     CompareWithCompareFunctionArguments *args = compareWithCompareFunctionArguments;
    00344
    00345     ValueImp *va = *(ValueImp **)a;
    00346     ValueImp *vb = *(ValueImp **)b;
    00347     if (va->dispatchType() == UndefinedType) {
    00348         return vb->dispatchType() == UndefinedType ? 0 : 1;
    00349     }
    00350     if (vb->dispatchType() == UndefinedType) {
    00351         return -1;
    00352     }
    00353
    00354     args->arguments.clear();
    00355     args->arguments.append(va);
    00356     args->arguments.append(vb);
    00357     double v = args->compareFunction->call(args->exec, args->globalObject, args->arguments)
    00358         .toNumber(args->exec);
    00359
    00360     // v may be outside integer range; check sign
    00361     if (v > 0)
    00362       return 1;
    00363     else if (v < 0)
    00364       return -1;
    00365     else
    00366       return 0;
    00367 }
    00368
    00369 void ArrayInstanceImp::sort(ExecState *exec, Object &compareFunction)
    00370 {
    00371     int lengthNotIncludingUndefined = pushUndefinedObjectsToEnd(exec);
    00372
    00373     CompareWithCompareFunctionArguments args(exec, compareFunction.imp());
    00374     compareWithCompareFunctionArguments = &args;
    00375     qsort(storage, lengthNotIncludingUndefined, sizeof(ValueImp *), compareWithCompareFunctionForQSort);
    00376     compareWithCompareFunctionArguments = 0;
    00377 }
    00378
    00379 unsigned ArrayInstanceImp::pushUndefinedObjectsToEnd(ExecState *exec)
    00380 {
    00381     ValueImp *undefined = UndefinedImp::staticUndefined;
    00382
    00383     unsigned o = 0;
    00384
    00385     for (unsigned i = 0; i != storageLength; ++i) {
    00386         ValueImp *v = storage[i];
    00387         if (v && v != undefined) {
    00388             if (o != i)
    00389                 storage[o] = v;
    00390             o++;
    00391         }
    00392     }
    00393
    00394     ReferenceList sparseProperties;
    00395     _prop.addSparseArrayPropertiesToReferenceList(sparseProperties, Object(this));
    00396     unsigned newLength = o + sparseProperties.length();
    00397
    00398     if (newLength > storageLength) {
    00399       resizeStorage(newLength);
    00400     }
    00401
    00402     ReferenceListIterator it = sparseProperties.begin();
    00403     while (it != sparseProperties.end()) {
    00404       Reference ref = it++;
    00405       storage[o] = ref.getValue(exec).imp();
    00406       ObjectImp::deleteProperty(exec, ref.getPropertyName(exec));
    00407       o++;
    00408     }
    00409
    00410     if (newLength != storageLength)
    00411         memset(storage + o, 0, sizeof(ValueImp *) * (storageLength - o));
    00412
    00413     return o;
    00414 }
    00415
    00416 // ------------------------------ ArrayPrototypeImp ----------------------------
    00417
    00418 const ClassInfo ArrayPrototypeImp::info = {"Array", &ArrayInstanceImp::info, &arrayTable, 0};
    00419
    00420 /* Source for array_object.lut.h
    00421 @begin arrayTable 17
    00422   toString       ArrayProtoFuncImp::ToString       DontEnum|Function 0
    00423   toLocaleString ArrayProtoFuncImp::ToLocaleString DontEnum|Function 0
    00424   concat         ArrayProtoFuncImp::Concat         DontEnum|Function 0
    00425   join           ArrayProtoFuncImp::Join           DontEnum|Function 1
    00426   pop            ArrayProtoFuncImp::Pop            DontEnum|Function 0
    00427   push           ArrayProtoFuncImp::Push           DontEnum|Function 1
    00428   reverse        ArrayProtoFuncImp::Reverse        DontEnum|Function 0
    00429   shift          ArrayProtoFuncImp::Shift          DontEnum|Function 0
    00430   slice          ArrayProtoFuncImp::Slice          DontEnum|Function 2
    00431   sort           ArrayProtoFuncImp::Sort           DontEnum|Function 1
    00432   splice         ArrayProtoFuncImp::Splice         DontEnum|Function 2
    00433   unshift        ArrayProtoFuncImp::UnShift        DontEnum|Function 1
    00434 @end
    00435 */
    00436
    00437 // ECMA 15.4.4
    00438 ArrayPrototypeImp::ArrayPrototypeImp(ExecState */*exec*/,
    00439                                      ObjectPrototypeImp *objProto)
    00440   : ArrayInstanceImp(objProto, 0)
    00441 {
    00442   Value protect(this);
    00443   setInternalValue(Null());
    00444 }
    00445
    00446 Value ArrayPrototypeImp::get(ExecState *exec, const Identifier &propertyName) const
    00447 {
    00448   //fprintf( stderr, "ArrayPrototypeImp::get(%s)\n", propertyName.ascii() );
    00449   return lookupGetFunction<ArrayProtoFuncImp, ArrayInstanceImp>( exec, propertyName, &arrayTable, this );
    00450 }
    00451
    00452 // ------------------------------ ArrayProtoFuncImp ----------------------------
    00453
    00454 ArrayProtoFuncImp::ArrayProtoFuncImp(ExecState *exec, int i, int len)
    00455   : InternalFunctionImp(
    00456     static_cast<FunctionPrototypeImp*>(exec->interpreter()->builtinFunctionPrototype().imp())
    00457     ), id(i)
    00458 {
    00459   Value protect(this);
    00460   put(exec,lengthPropertyName,Number(len),DontDelete|ReadOnly|DontEnum);
    00461 }
    00462
    00463 bool ArrayProtoFuncImp::implementsCall() const
    00464 {
    00465   return true;
    00466 }
    00467
    00468 UString valueToLocaleString(ExecState *exec, Value v)
    00469 {
    00470   Object o = v.toObject(exec);
    00471   Object toLocaleString = Object::dynamicCast(o.get(exec,toLocaleStringPropertyName));
    00472   List args;
    00473   if (toLocaleString.isValid() && toLocaleString.implementsCall())
    00474     return toLocaleString.call(exec,o,args).toString(exec);
    00475   else
    00476     return o.toString(exec);
    00477 }
    00478
    00479 // ECMA 15.4.4
    00480 Value ArrayProtoFuncImp::call(ExecState *exec, Object &thisObj, const List &args)
    00481 {
    00482   unsigned int length = thisObj.get(exec,lengthPropertyName).toUInt32(exec);
    00483
    00484   Value result;
    00485   switch (id) {
    00486   case ToLocaleString:
    00487     // fall through
    00488   case ToString:
    00489     if (!thisObj.inherits(&ArrayInstanceImp::info)) {
    00490       Object err = Error::create(exec,TypeError);
    00491       exec->setException(err);
    00492       return err;
    00493     }
    00494     // fall through
    00495   case Join: {
    00496     UString separator = ",";
    00497     UString str = "";
    00498
    00499     if (id == Join && args.size() > 0 && !args[0].isA(UndefinedType))
    00500       separator = args[0].toString(exec);
    00501     for (unsigned int k = 0; k < length; k++) {
    00502       if (k >= 1)
    00503         str += separator;
    00504       Value element = thisObj.get(exec,k);
    00505       if (element.type() != UndefinedType && element.type() != NullType)
    00506         str += (id == ToLocaleString ? valueToLocaleString(exec,element) : element.toString(exec));
    00507       if (exec->hadException())
    00508         break;
    00509     }
    00510     result = String(str);
    00511     break;
    00512   }
    00513   case Concat: {
    00514     Object arr = Object::dynamicCast(exec->interpreter()->builtinArray().construct(exec,List::empty()));
    00515     int n = 0;
    00516     Value curArg = thisObj;
    00517     Object curObj = Object::dynamicCast(thisObj);
    00518     ListIterator it = args.begin();
    00519     for (;;) {
    00520       if (curArg.type() == ObjectType &&
    00521           curObj.inherits(&ArrayInstanceImp::info)) {
    00522         unsigned int k = 0;
    00523         // Older versions tried to optimize out getting the length of thisObj
    00524         // by checking for n != 0, but that doesn't work if thisObj is an empty array.
    00525         length = curObj.get(exec,lengthPropertyName).toUInt32(exec);
    00526         while (k < length) {
    00527           if (curObj.hasProperty(exec,k))
    00528             arr.put(exec, n, curObj.get(exec, k));
    00529           n++;
    00530           k++;
    00531         }
    00532       } else {
    00533         arr.put(exec, n, curArg);
    00534         n++;
    00535       }
    00536       if (it == args.end())
    00537         break;
    00538       curArg = *it;
    00539       curObj = Object::dynamicCast(it++); // may be 0
    00540     }
    00541     arr.put(exec,lengthPropertyName, Number(n), DontEnum | DontDelete);
    00542
    00543     result = arr;
    00544     break;
    00545   }
    00546   case Pop:{
    00547     if (length == 0) {
    00548       thisObj.put(exec, lengthPropertyName, Number(length), DontEnum | DontDelete);
    00549       result = Undefined();
    00550     } else {
    00551       result = thisObj.get(exec, length - 1);
    00552       thisObj.put(exec, lengthPropertyName, Number(length - 1), DontEnum | DontDelete);
    00553     }
    00554     break;
    00555   }
    00556   case Push: {
    00557     for (int n = 0; n < args.size(); n++)
    00558       thisObj.put(exec, length + n, args[n]);
    00559     length += args.size();
    00560     thisObj.put(exec,lengthPropertyName, Number(length), DontEnum | DontDelete);
    00561     result = Number(length);
    00562     break;
    00563   }
    00564   case Reverse: {
    00565
    00566     unsigned int middle = length / 2;
    00567
    00568     for (unsigned int k = 0; k < middle; k++) {
    00569       unsigned lk1 = length - k - 1;
    00570       Value obj = thisObj.get(exec,k);
    00571       Value obj2 = thisObj.get(exec,lk1);
    00572       if (thisObj.hasProperty(exec,lk1)) {
    00573         if (thisObj.hasProperty(exec,k)) {
    00574           thisObj.put(exec, k, obj2);
    00575           thisObj.put(exec, lk1, obj);
    00576         } else {
    00577           thisObj.put(exec, k, obj2);
    00578           thisObj.deleteProperty(exec, lk1);
    00579         }
    00580       } else {
    00581         if (thisObj.hasProperty(exec, k)) {
    00582           thisObj.deleteProperty(exec, k);
    00583           thisObj.put(exec, lk1, obj);
    00584         } else {
    00585           // why delete something that's not there ? Strange.
    00586           thisObj.deleteProperty(exec, k);
    00587           thisObj.deleteProperty(exec, lk1);
    00588         }
    00589       }
    00590     }
    00591     result = thisObj;
    00592     break;
    00593   }
    00594   case Shift: {
    00595     if (length == 0) {
    00596       thisObj.put(exec, lengthPropertyName, Number(length), DontEnum | DontDelete);
    00597       result = Undefined();
    00598     } else {
    00599       result = thisObj.get(exec, 0);
    00600       for(unsigned int k = 1; k < length; k++) {
    00601         if (thisObj.hasProperty(exec, k)) {
    00602           Value obj = thisObj.get(exec, k);
    00603           thisObj.put(exec, k-1, obj);
    00604         } else
    00605           thisObj.deleteProperty(exec, k-1);
    00606       }
    00607       thisObj.deleteProperty(exec, length - 1);
    00608       thisObj.put(exec, lengthPropertyName, Number(length - 1), DontEnum | DontDelete);
    00609     }
    00610     break;
    00611   }
    00612   case Slice: {
    00613     // http://developer.netscape.com/docs/manuals/js/client/jsref/array.htm#1193713 or 15.4.4.10
    00614
    00615     // We return a new array
    00616     Object resObj = Object::dynamicCast(exec->interpreter()->builtinArray().construct(exec,List::empty()));
    00617     result = resObj;
    00618     int begin = 0;
    00619     if (args[0].type() != UndefinedType) {
    00620       begin = args[0].toInteger(exec);
    00621       if ( begin < 0 )
    00622         begin = maxInt( begin + length, 0 );
    00623       else
    00624         begin = minInt( begin, length );
    00625     }
    00626     int end = length;
    00627     if (args[1].type() != UndefinedType)
    00628     {
    00629       end = args[1].toInteger(exec);
    00630       if ( end < 0 )
    00631         end = maxInt( end + length, 0 );
    00632       else
    00633         end = minInt( end, length );
    00634     }
    00635
    00636     //printf( "Slicing from %d to %d \n", begin, end );
    00637     int n = 0;
    00638     for(int k = begin; k < end; k++, n++) {
    00639       if (thisObj.hasProperty(exec, k)) {
    00640         Value obj = thisObj.get(exec, k);
    00641         resObj.put(exec, n, obj);
    00642       }
    00643     }
    00644     resObj.put(exec, lengthPropertyName, Number(n), DontEnum | DontDelete);
    00645     break;
    00646   }
    00647   case Sort:{
    00648 #if 0
    00649     printf("KJS Array::Sort length=%d\n", length);
    00650     for ( unsigned int i = 0 ; i<length ; ++i )
    00651       printf("KJS Array::Sort: %d: %s\n", i, thisObj.get(exec, i).toString(exec).ascii() );
    00652 #endif
    00653     Object sortFunction;
    00654     bool useSortFunction = (args[0].type() != UndefinedType);
    00655     if (useSortFunction)
    00656       {
    00657         sortFunction = args[0].toObject(exec);
    00658         if (!sortFunction.implementsCall())
    00659           useSortFunction = false;
    00660       }
    00661
    00662     if (thisObj.imp()->classInfo() == &ArrayInstanceImp::info) {
    00663       if (useSortFunction)
    00664         ((ArrayInstanceImp *)thisObj.imp())->sort(exec, sortFunction);
    00665       else
    00666         ((ArrayInstanceImp *)thisObj.imp())->sort(exec);
    00667       result = thisObj;
    00668       break;
    00669     }
    00670
    00671     if (length == 0) {
    00672       thisObj.put(exec, lengthPropertyName, Number(0), DontEnum | DontDelete);
    00673       result = thisObj;
    00674       break;
    00675     }
    00676
    00677     // "Min" sort. Not the fastest, but definitely less code than heapsort
    00678     // or quicksort, and much less swapping than bubblesort/insertionsort.
    00679     for ( unsigned int i = 0 ; i<length-1 ; ++i )
    00680       {
    00681         Value iObj = thisObj.get(exec,i);
    00682         unsigned int themin = i;
    00683         Value minObj = iObj;
    00684         for ( unsigned int j = i+1 ; j<length ; ++j )
    00685           {
    00686             Value jObj = thisObj.get(exec,j);
    00687             double cmp;
    00688             if (jObj.type() == UndefinedType) {
    00689               cmp = 1; // don't check minObj because there's no need to differentiate == (0) from > (1)
    00690             } else if (minObj.type() == UndefinedType) {
    00691               cmp = -1;
    00692             } else if (useSortFunction) {
    00693                 List l;
    00694                 l.append(jObj);
    00695                 l.append(minObj);
    00696                 cmp = sortFunction.call(exec, exec->interpreter()->globalObject(), l).toNumber(exec);
    00697             } else {
    00698               cmp = (jObj.toString(exec) < minObj.toString(exec)) ? -1 : 1;
    00699             }
    00700             if ( cmp < 0 )
    00701               {
    00702                 themin = j;
    00703                 minObj = jObj;
    00704               }
    00705           }
    00706         // Swap themin and i
    00707         if ( themin > i )
    00708           {
    00709             //printf("KJS Array::Sort: swapping %d and %d\n", i, themin );
    00710             thisObj.put( exec, i, minObj );
    00711             thisObj.put( exec, themin, iObj );
    00712           }
    00713       }
    00714 #if 0
    00715     printf("KJS Array::Sort -- Resulting array:\n");
    00716     for ( unsigned int i = 0 ; i<length ; ++i )
    00717       printf("KJS Array::Sort: %d: %s\n", i, thisObj.get(exec, i).toString(exec).ascii() );
    00718 #endif
    00719     result = thisObj;
    00720     break;
    00721   }
    00722   case Splice: {
    00723     // 15.4.4.12 - oh boy this is huge
    00724     Object resObj = Object::dynamicCast(exec->interpreter()->builtinArray().construct(exec,List::empty()));
    00725     result = resObj;
    00726     int begin = args[0].toUInt32(exec);
    00727     if ( begin < 0 )
    00728       begin = maxInt( begin + length, 0 );
    00729     else
    00730       begin = minInt( begin, length );
    00731     unsigned int deleteCount = minInt( maxInt( args[1].toUInt32(exec), 0 ), length - begin );
    00732
    00733     //printf( "Splicing from %d, deleteCount=%d \n", begin, deleteCount );
    00734     for(unsigned int k = 0; k < deleteCount; k++) {
    00735       if (thisObj.hasProperty(exec,k+begin)) {
    00736         Value obj = thisObj.get(exec, k+begin);
    00737         resObj.put(exec, k, obj);
    00738       }
    00739     }
    00740     resObj.put(exec, lengthPropertyName, Number(deleteCount), DontEnum | DontDelete);
    00741
    00742     unsigned int additionalArgs = maxInt( args.size() - 2, 0 );
    00743     if ( additionalArgs != deleteCount )
    00744     {
    00745       if ( additionalArgs < deleteCount )
    00746       {
    00747         for ( unsigned int k = begin; k < length - deleteCount; ++k )
    00748         {
    00749           if (thisObj.hasProperty(exec,k+deleteCount)) {
    00750             Value obj = thisObj.get(exec, k+deleteCount);
    00751             thisObj.put(exec, k+additionalArgs, obj);
    00752           }
    00753           else
    00754             thisObj.deleteProperty(exec, k+additionalArgs);
    00755         }
    00756         for ( unsigned int k = length ; k > length - deleteCount + additionalArgs; --k )
    00757           thisObj.deleteProperty(exec, k-1);
    00758       }
    00759       else
    00760       {
    00761         for ( unsigned int k = length - deleteCount; (int)k > begin; --k )
    00762         {
    00763           if (thisObj.hasProperty(exec,k+deleteCount-1)) {
    00764             Value obj = thisObj.get(exec, k+deleteCount-1);
    00765             thisObj.put(exec, k+additionalArgs-1, obj);
    00766           }
    00767           else
    00768             thisObj.deleteProperty(exec, k+additionalArgs-1);
    00769         }
    00770       }
    00771     }
    00772     for ( unsigned int k = 0; k < additionalArgs; ++k )
    00773     {
    00774       thisObj.put(exec, k+begin, args[k+2]);
    00775     }
    00776     thisObj.put(exec, lengthPropertyName, Number(length - deleteCount + additionalArgs), DontEnum | DontDelete);
    00777     break;
    00778   }
    00779   case UnShift: { // 15.4.4.13
    00780     unsigned int nrArgs = args.size();
    00781     for ( unsigned int k = length; k > 0; --k )
    00782     {
    00783       if (thisObj.hasProperty(exec,k-1)) {
    00784         Value obj = thisObj.get(exec, k-1);
    00785         thisObj.put(exec, k+nrArgs-1, obj);
    00786       } else {
    00787         thisObj.deleteProperty(exec, k+nrArgs-1);
    00788       }
    00789     }
    00790     for ( unsigned int k = 0; k < nrArgs; ++k )
    00791       thisObj.put(exec, k, args[k]);
    00792     result = Number(length + nrArgs);
    00793     thisObj.put(exec, lengthPropertyName, result, DontEnum | DontDelete);
    00794     break;
    00795   }
    00796   default:
    00797     assert(0);
    00798     break;
    00799   }
    00800   return result;
    00801 }
    00802
    00803 // ------------------------------ ArrayObjectImp -------------------------------
    00804
    00805 ArrayObjectImp::ArrayObjectImp(ExecState *exec,
    00806                                FunctionPrototypeImp *funcProto,
    00807                                ArrayPrototypeImp *arrayProto)
    00808   : InternalFunctionImp(funcProto)
    00809 {
    00810   Value protect(this);
    00811   // ECMA 15.4.3.1 Array.prototype
    00812   put(exec,prototypePropertyName, Object(arrayProto), DontEnum|DontDelete|ReadOnly);
    00813
    00814   // no. of arguments for constructor
    00815   put(exec,lengthPropertyName, Number(1), ReadOnly|DontDelete|DontEnum);
    00816 }
    00817
    00818 bool ArrayObjectImp::implementsConstruct() const
    00819 {
    00820   return true;
    00821 }
    00822
    00823 // ECMA 15.4.2
    00824 Object ArrayObjectImp::construct(ExecState *exec, const List &args)
    00825 {
    00826   // a single numeric argument denotes the array size (!)
    00827   if (args.size() == 1 && args[0].type() == NumberType)
    00828     return Object(new ArrayInstanceImp(exec->interpreter()->builtinArrayPrototype().imp(), args[0].toUInt32(exec)));
    00829
    00830   // otherwise the array is constructed with the arguments in it
    00831   return Object(new ArrayInstanceImp(exec->interpreter()->builtinArrayPrototype().imp(), args));
    00832 }
    00833
    00834 bool ArrayObjectImp::implementsCall() const
    00835 {
    00836   return true;
    00837 }
    00838
    00839 // ECMA 15.6.1
    00840 Value ArrayObjectImp::call(ExecState *exec, Object &/*thisObj*/, const List &args)
    00841 {
    00842   // equivalent to 'new Array(....)'
    00843   return construct(exec,args);
    00844 }

This file is part of the documentation for kjs Library Version 3.4.1.
Documentation copyright © 1996-2004 the KDE developers.
Generated on Sat Jun 11 20:23:05 2005 by doxygen 1.4.1 written by Dimitri van Heesch, © 1997-2003