string_object.cpp

来自「konqueror3 embedded版本, KDE环境下的当家浏览器的嵌入式版」· C++ 代码 · 共 661 行 · 第 1/2 页

      int lastIndex = 0;
      Object o1;
      // Test if 2nd arg is a function (new in JS 1.3)
      if ( a1.type() == ObjectType && a1.toObject(exec).implementsCall() )
        o1 = a1.toObject(exec);
      else
        u3 = a1.toString(exec); // 2nd arg is the replacement string

      // This is either a loop (if global is set) or a one-way (if not).
      do {
        int **ovector = regExpObj->registerRegexp( reg, s );
        UString mstr = reg->match(s, lastIndex, &pos, ovector);
        regExpObj->setSubPatterns(reg->subPatterns());
        if (pos == -1)
          break;
        len = mstr.size();

        UString rstr;
        // Prepare replacement
        if (!o1.isValid())
        {
          rstr = u3;
          bool ok;
          // check if u3 matches $1 or $2 etc
          for (int i = 0; (i = rstr.find(UString("$"), i)) != -1; i++) {
            if (i+1<rstr.size() && rstr[i+1] == '$') {  // "$$" -> "$"
              rstr = rstr.substr(0,i) + "$" + rstr.substr(i+2);
              continue;
            }
            // Assume number part is one char exactly
            unsigned long pos = rstr.substr(i+1,1).toULong(&ok, false /* tolerate empty string */);
            if (ok && pos <= (unsigned)reg->subPatterns()) {
              rstr = rstr.substr(0,i)
                     + s.substr((*ovector)[2*pos],
                                (*ovector)[2*pos+1]-(*ovector)[2*pos])
                     + rstr.substr(i+2);
              i += (*ovector)[2*pos+1]-(*ovector)[2*pos] - 1; // -1 offsets i++
            }
          }
        } else // 2nd arg is a function call. Spec from http://devedge.netscape.com/library/manuals/2000/javascript/1.5/reference/string.html#1194258
        {
          List l;
          l.append(String(mstr)); // First arg: complete matched substring
          // Then the submatch strings
          for ( unsigned int sub = 1; sub <= reg->subPatterns() ; ++sub )
            l.append( String( s.substr((*ovector)[2*sub],
                               (*ovector)[2*sub+1]-(*ovector)[2*sub]) ) );
          l.append(Number(pos)); // The offset within the string where the match occurred
          l.append(String(s)); // Last arg: the string itself. Can't see the difference with the 1st arg!
          Object thisObj = exec->interpreter()->globalObject();
          rstr = o1.call( exec, thisObj, l ).toString(exec);
        }
        lastIndex = pos + rstr.size();
        s = s.substr(0, pos) + rstr + s.substr(pos + len);
        //fprintf(stderr,"pos=%d,len=%d,lastIndex=%d,s=%s\n",pos,len,lastIndex,s.ascii());
      } while (global);

      result = String(s);
    } else { // First arg is a string
      u2 = a0.toString(exec);
      pos = s.find(u2);
      len = u2.size();
      // Do the replacement
      if (pos == -1)
        result = String(s);
      else {
        u3 = s.substr(0, pos) + a1.toString(exec) +
             s.substr(pos + len);
        result = String(u3);
      }
    }
    break;
  case Slice: // http://developer.netscape.com/docs/manuals/js/client/jsref/string.htm#1194366 or 15.5.4.13
    {
        // The arg processing is very much like ArrayProtoFunc::Slice
        int begin = args[0].toUInt32(exec);
        int end = len;
        if (args[1].type() != UndefinedType) {
          end = args[1].toInteger(exec);
        }
        int from = begin < 0 ? len + begin : begin;
        int to = end < 0 ? len + end : end;
        if (to > from && to > 0 && from < len) {
          if (from < 0) {
            from = 0;
          }
          if (to > len) {
            to = len;
          }
          result = String(s.substr(from, to - from));
        } else {
          result = String("");
        }
        break;
    }
    case Split: {
    Object constructor = exec->lexicalInterpreter()->builtinArray();
    Object res = Object::dynamicCast(constructor.construct(exec,List::empty()));
    result = res;
    i = p0 = 0;
    uint32_t limit = (a1.type() != UndefinedType) ? a1.toUInt32(exec) : 0xFFFFFFFFU;
    if (a0.type() == ObjectType && Object::dynamicCast(a0).inherits(&RegExpImp::info)) {
      Object obj0 = Object::dynamicCast(a0);
      RegExp reg(obj0.get(exec,"source").toString(exec));
      if (s.isEmpty() && !reg.match(s, 0).isNull()) {
	// empty string matched by regexp -> empty array
	res.put(exec, lengthPropertyName, Number(0), DontDelete|ReadOnly|DontEnum);
	break;
      }
      pos = 0;
      while (static_cast<uint32_t>(i) != limit && pos < s.size()) {
	// TODO: back references
        int mpos;
        int *ovector = 0L;
	UString mstr = reg.match(s, pos, &mpos, &ovector);
        delete [] ovector; ovector = 0L;
	if (mpos < 0)
	  break;
	pos = mpos + (mstr.isEmpty() ? 1 : mstr.size());
	if (mpos != p0 || !mstr.isEmpty()) {
	  res.put(exec,i, String(s.substr(p0, mpos-p0)));
	  p0 = mpos + mstr.size();
	  i++;
	}
      }
    } else {
      u2 = a0.toString(exec);
      if (u2.isEmpty()) {
	if (s.isEmpty()) {
	  // empty separator matches empty string -> empty array
	  put(exec,lengthPropertyName, Number(0));
	  break;
	} else {
	  while (static_cast<uint32_t>(i) != limit && i < s.size()-1)
	    res.put(exec,i++, String(s.substr(p0++, 1)));
	}
      } else {
	while (static_cast<uint32_t>(i) != limit && (pos = s.find(u2, p0)) >= 0) {
	  res.put(exec,i, String(s.substr(p0, pos-p0)));
	  p0 = pos + u2.size();
	  i++;
	}
      }
    }
    // add remaining string, if any
    if (static_cast<uint32_t>(i) != limit)
      res.put(exec,i++, String(s.substr(p0)));
    res.put(exec,lengthPropertyName, Number(i));
    }
    break;
  case Substr: {
    n = a0.toInteger(exec);
    m = a1.toInteger(exec);
    int d, d2;
    if (n >= 0)
      d = n;
    else
      d = maxInt(len + n, 0);
    if (a1.type() == UndefinedType)
      d2 = len - d;
    else
      d2 = minInt(maxInt(m, 0), len - d);
    result = String(s.substr(d, d2));
    break;
  }
  case Substring: {
    double start = a0.toNumber(exec);
    double end = a1.toNumber(exec);
    if (KJS::isNaN(start))
      start = 0;
    if (KJS::isNaN(end))
      end = 0;
    if (start < 0)
      start = 0;
    if (end < 0)
      end = 0;
    if (start > len)
      start = len;
    if (end > len)
      end = len;
    if (a1.type() == UndefinedType)
      end = len;
    if (start > end) {
      double temp = end;
      end = start;
      start = temp;
    }
    result = String(s.substr((int)start, (int)end-(int)start));
    }
    break;
  case ToLowerCase:
  case ToLocaleLowerCase: // FIXME: To get this 100% right we need to detect Turkish and change I to lowercase i without a dot.
    for (i = 0; i < len; i++)
      s[i] = s[i].toLower();
    result = String(s);
    break;
  case ToUpperCase:
  case ToLocaleUpperCase: // FIXME: To get this 100% right we need to detect Turkish and change i to uppercase I with a dot.
    for (i = 0; i < len; i++)
      s[i] = s[i].toUpper();
    result = String(s);
    break;
#ifndef KJS_PURE_ECMA
  case Big:
    result = String("<big>" + s + "</big>");
    break;
  case Small:
    result = String("<small>" + s + "</small>");
    break;
  case Blink:
    result = String("<blink>" + s + "</blink>");
    break;
  case Bold:
    result = String("<b>" + s + "</b>");
    break;
  case Fixed:
    result = String("<tt>" + s + "</tt>");
    break;
  case Italics:
    result = String("<i>" + s + "</i>");
    break;
  case Strike:
    result = String("<strike>" + s + "</strike>");
    break;
  case Sub:
    result = String("<sub>" + s + "</sub>");
    break;
  case Sup:
    result = String("<sup>" + s + "</sup>");
    break;
  case Fontcolor:
    result = String("<font color=\"" + a0.toString(exec) + "\">" + s + "</font>");
    break;
  case Fontsize:
    result = String("<font size=\"" + a0.toString(exec) + "\">" + s + "</font>");
    break;
  case Anchor:
    result = String("<a name=\"" + a0.toString(exec) + "\">" + s + "</a>");
    break;
  case Link:
    result = String("<a href=\"" + a0.toString(exec) + "\">" + s + "</a>");
    break;
#endif
  }

  return result;
}

// ------------------------------ StringObjectImp ------------------------------

StringObjectImp::StringObjectImp(ExecState *exec,
                                 FunctionPrototypeImp *funcProto,
                                 StringPrototypeImp *stringProto)
  : InternalFunctionImp(funcProto)
{
  Value protect(this);
  // ECMA 15.5.3.1 String.prototype
  putDirect(prototypePropertyName, stringProto, DontEnum|DontDelete|ReadOnly);

  putDirect("fromCharCode", new StringObjectFuncImp(exec,funcProto), DontEnum);

  // no. of arguments for constructor
  putDirect(lengthPropertyName, NumberImp::one(), ReadOnly|DontDelete|DontEnum);
}


bool StringObjectImp::implementsConstruct() const
{
  return true;
}

// ECMA 15.5.2
Object StringObjectImp::construct(ExecState *exec, const List &args)
{
  ObjectImp *proto = exec->lexicalInterpreter()->builtinStringPrototype().imp();
  if (args.size() == 0)
    return Object(new StringInstanceImp(proto));
  return Object(new StringInstanceImp(proto, args.begin()->dispatchToString(exec)));
}

bool StringObjectImp::implementsCall() const
{
  return true;
}

// ECMA 15.5.1
Value StringObjectImp::call(ExecState *exec, Object &/*thisObj*/, const List &args)
{
  if (args.isEmpty())
    return String("");
  else {
    Value v = args[0];
    return String(v.toString(exec));
  }
}

// ------------------------------ StringObjectFuncImp --------------------------

// ECMA 15.5.3.2 fromCharCode()
StringObjectFuncImp::StringObjectFuncImp(ExecState* /*exec*/, FunctionPrototypeImp *funcProto)
  : InternalFunctionImp(funcProto)
{
  Value protect(this);
  putDirect(lengthPropertyName, NumberImp::one(), DontDelete|ReadOnly|DontEnum);
}

bool StringObjectFuncImp::implementsCall() const
{
  return true;
}

Value StringObjectFuncImp::call(ExecState *exec, Object &/*thisObj*/, const List &args)
{
  UString s;
  if (args.size()) {
    UChar *buf = new UChar[args.size()];
    UChar *p = buf;
    ListIterator it = args.begin();
    while (it != args.end()) {
      unsigned short u = it->toUInt16(exec);
      *p++ = UChar(u);
      it++;
    }
    s = UString(buf, args.size(), false);
  } else
    s = "";

  return String(s);
}