Example #1
0
/*JSON{
  "type" : "method",
  "class" : "ArrayBufferView",
  "name" : "set",
  "generate" : "jswrap_arraybufferview_set",
  "params" : [
    ["arr","JsVar","Floating point index to access"],
    ["offset","int32","The offset in this array at which to write the values (optional)"]
  ]
}
Copy the contents of `array` into this one, mapping `this[x+offset]=array[x];`
*/
void jswrap_arraybufferview_set(JsVar *parent, JsVar *arr, int offset) {
  if (!(jsvIsString(arr) || jsvIsArray(arr) || jsvIsArrayBuffer(arr))) {
    jsExceptionHere(JSET_ERROR, "Expecting first argument to be an array, not %t", arr);
    return;
  }
  JsvIterator itsrc;
  jsvIteratorNew(&itsrc, arr);
  JsvArrayBufferIterator itdst;
  jsvArrayBufferIteratorNew(&itdst, parent, (size_t)offset);

  bool useInts = !JSV_ARRAYBUFFER_IS_FLOAT(itdst.type) || jsvIsString(arr);

  while (jsvIteratorHasElement(&itsrc) && jsvArrayBufferIteratorHasElement(&itdst)) {
    if (useInts) {
      jsvArrayBufferIteratorSetIntegerValue(&itdst, jsvIteratorGetIntegerValue(&itsrc));
    } else {
      JsVar *value = jsvIteratorGetValue(&itsrc);
      jsvArrayBufferIteratorSetValue(&itdst, value);
      jsvUnLock(value);
    }
    jsvArrayBufferIteratorNext(&itdst);
    jsvIteratorNext(&itsrc);
  }
  jsvArrayBufferIteratorFree(&itdst);
  jsvIteratorFree(&itsrc);
}
Example #2
0
JsVar *jswrap_io_peek(JsVarInt addr, JsVarInt count, int wordSize) {
  if (count<=1) {
    return jsvNewFromLongInteger((long long)_jswrap_io_peek(addr, wordSize));
  } else {
    JsVarDataArrayBufferViewType aType;
	  // EDIT //
	  switch (wordSize) {
		  case 1: aType=ARRAYBUFFERVIEW_UINT8; break;
		  case 2: aType=ARRAYBUFFERVIEW_UINT16; break;
		  default: aType=ARRAYBUFFERVIEW_UINT32; break;
	  }
//    if (wordSize==1) aType=ARRAYBUFFERVIEW_UINT8;
//    if (wordSize==2) aType=ARRAYBUFFERVIEW_UINT16;
//    if (wordSize==4) aType=ARRAYBUFFERVIEW_UINT32;
    JsVar *arr = jsvNewTypedArray(aType, count);
    if (!arr) return 0;
    JsvArrayBufferIterator it;
    jsvArrayBufferIteratorNew(&it, arr, 0);
    while (jsvArrayBufferIteratorHasElement(&it)) {
      jsvArrayBufferIteratorSetIntegerValue(&it, (JsVarInt)_jswrap_io_peek(addr, wordSize));
      addr += wordSize;
      jsvArrayBufferIteratorNext(&it);
    }
    jsvArrayBufferIteratorFree(&it);
    return arr;
  }
}
Example #3
0
bool jsvIteratorHasElement(JsvIterator *it) {
  switch (it->type) {
  case JSVI_OBJECT : return jsvObjectIteratorHasValue(&it->it.obj);
  case JSVI_STRING : return jsvStringIteratorHasChar(&it->it.str);
  case JSVI_ARRAYBUFFER : return jsvArrayBufferIteratorHasElement(&it->it.buf);
  default: assert(0); return 0;
  }
}
Example #4
0
/**
 * \brief Iterate over the contents of the content of a variable, calling callback for each.
 * Contents may be:
 * * numeric -> output
 * * a string -> output each character
 * * array/arraybuffer -> call itself on each element
 * object -> call itself object.count times, on object.data
 */
bool jsvIterateCallback(
    JsVar *data,                                    // The data to iterate over.
	void (*callback)(int item, void *callbackData), // The callback function invoke.
	void *callbackData                              // Data to be passed to the callback function
  ) {
  bool ok = true;
  // Handle the data being a single numeric.
  if (jsvIsNumeric(data)) {
    callback((int)jsvGetInteger(data), callbackData);
  }
  // Handle the data being an object.
  else if (jsvIsObject(data)) {
    JsVar *countVar = jsvObjectGetChild(data, "count", 0);
    JsVar *dataVar = jsvObjectGetChild(data, "data", 0);
    if (countVar && dataVar && jsvIsNumeric(countVar)) {
      int n = (int)jsvGetInteger(countVar);
      while (ok && n-- > 0) {
        ok = jsvIterateCallback(dataVar, callback, callbackData);
      }
    } else {
      jsWarn("If specifying an object, it must be of the form {data : ..., count : N}");
    }
    jsvUnLock2(countVar, dataVar);
  }
  // Handle the data being a string
  else if (jsvIsString(data)) {
    JsvStringIterator it;
    jsvStringIteratorNew(&it, data, 0);
    while (jsvStringIteratorHasChar(&it) && ok) {
      char ch = jsvStringIteratorGetChar(&it);
      callback(ch, callbackData);
      jsvStringIteratorNext(&it);
    }
    jsvStringIteratorFree(&it);
  }
  // Handle the data being an array buffer
  else if (jsvIsArrayBuffer(data)) {
    JsvArrayBufferIterator it;
    jsvArrayBufferIteratorNew(&it, data, 0);
    if (JSV_ARRAYBUFFER_GET_SIZE(it.type) == 1 && !JSV_ARRAYBUFFER_IS_SIGNED(it.type)) {
      // faster for single byte arrays.
      while (jsvArrayBufferIteratorHasElement(&it)) {
        callback((int)(unsigned char)jsvStringIteratorGetChar(&it.it), callbackData);
        jsvArrayBufferIteratorNext(&it);
      }
    } else {
      while (jsvArrayBufferIteratorHasElement(&it)) {
        callback((int)jsvArrayBufferIteratorGetIntegerValue(&it), callbackData);
        jsvArrayBufferIteratorNext(&it);
      }
    }
    jsvArrayBufferIteratorFree(&it);
  }
  // Handle the data being iterable
  else if (jsvIsIterable(data)) {
    JsvIterator it;
    jsvIteratorNew(&it, data);
    while (jsvIteratorHasElement(&it) && ok) {
      JsVar *el = jsvIteratorGetValue(&it);
      ok = jsvIterateCallback(el, callback, callbackData);
      jsvUnLock(el);
      jsvIteratorNext(&it);
    }
    jsvIteratorFree(&it);
  } else {
    jsWarn("Expecting a number or something iterable, got %t", data);
    ok = false;
  }
  return ok;
}
Example #5
0
void jsfGetJSONWithCallback(JsVar *var, JSONFlags flags, const char *whitespace, vcbprintf_callback user_callback, void *user_data) {
  JSONFlags nflags = flags + JSON_INDENT; // if we add a newline, make sure we indent any subsequent JSON more
  if (!whitespace) whitespace="  ";

  if (jsvIsUndefined(var)) {
    cbprintf(user_callback, user_data, "undefined");
  } else {
    // Use IS_RECURSING  flag to stop recursion
    if (var->flags & JSV_IS_RECURSING) {
      cbprintf(user_callback, user_data, " ... ");
      return;
    }
    var->flags |= JSV_IS_RECURSING;

    if (jsvIsArray(var)) {
      JsVarInt length = jsvGetArrayLength(var);
      bool limited = (flags&JSON_LIMIT) && (length>(JsVarInt)JSON_LIMIT_AMOUNT);
      bool needNewLine = false;
      cbprintf(user_callback, user_data, (flags&JSON_PRETTY)?"[ ":"[");
      JsVarInt lastIndex = -1;
      bool numeric = true;
      bool first = true;
      JsvObjectIterator it;
      jsvObjectIteratorNew(&it, var);
      while (lastIndex+1<length && numeric && !jspIsInterrupted()) {
        JsVar *key = jsvObjectIteratorGetKey(&it);
        if (!jsvObjectIteratorHasValue(&it) || jsvIsNumeric(key)) {
          JsVarInt index = jsvObjectIteratorHasValue(&it) ? jsvGetInteger(key) : length-1;
          JsVar *item = jsvObjectIteratorGetValue(&it);
          while (lastIndex < index) {
            lastIndex++;
            if (!limited || lastIndex<(JsVarInt)JSON_LIMITED_AMOUNT || lastIndex>=length-(JsVarInt)JSON_LIMITED_AMOUNT) {
              if (!first) cbprintf(user_callback, user_data, (flags&JSON_PRETTY)?", ":",");
              first = false;
              if (limited && lastIndex==length-(JsVarInt)JSON_LIMITED_AMOUNT) cbprintf(user_callback, user_data, JSON_LIMIT_TEXT);
              bool newNeedsNewLine = ((flags&JSON_SOME_NEWLINES) && jsonNeedsNewLine(item));
              if (flags&JSON_ALL_NEWLINES) {
                needNewLine = true;
                newNeedsNewLine = true;
              }
              if (needNewLine || newNeedsNewLine) {
                jsonNewLine(nflags, whitespace, user_callback, user_data);
                needNewLine = false;
              }
              if (lastIndex == index)
                jsfGetJSONWithCallback(item, nflags, whitespace, user_callback, user_data);
              else
                cbprintf(user_callback, user_data, (flags&JSON_NO_UNDEFINED)?"null":"undefined");
              needNewLine = newNeedsNewLine;
            }
          }
          jsvUnLock(item);
          jsvObjectIteratorNext(&it);
        } else {
          numeric = false;
        }
        jsvUnLock(key);
      }

      // non-numeric  - but NOT for standard JSON
      if ((flags&JSON_PRETTY))
        jsfGetJSONForObjectItWithCallback(&it, flags, whitespace, nflags, user_callback, user_data, first);
      jsvObjectIteratorFree(&it);
      if (needNewLine) jsonNewLine(flags, whitespace, user_callback, user_data);
      cbprintf(user_callback, user_data, (flags&JSON_PRETTY)?" ]":"]");
    } else if (jsvIsArrayBuffer(var)) {
      JsvArrayBufferIterator it;
      bool allZero = true;
      jsvArrayBufferIteratorNew(&it, var, 0);
      while (jsvArrayBufferIteratorHasElement(&it)) {
        if (jsvArrayBufferIteratorGetFloatValue(&it)!=0)
          allZero = false;
        jsvArrayBufferIteratorNext(&it);
      }
      jsvArrayBufferIteratorFree(&it);
      bool asArray = flags&JSON_ARRAYBUFFER_AS_ARRAY;

      if (allZero && !asArray) {
        cbprintf(user_callback, user_data, "new %s(%d)", jswGetBasicObjectName(var), jsvGetArrayBufferLength(var));
      } else {
        const char *aname = jswGetBasicObjectName(var);
        /* You can't do `new ArrayBuffer([1,2,3])` so we have to output
         * `new Uint8Array([1,2,3]).buffer`! */
        bool isBasicArrayBuffer = strcmp(aname,"ArrayBuffer")==0;
        if (isBasicArrayBuffer) {
          aname="Uint8Array";
        }
        cbprintf(user_callback, user_data, asArray?"[":"new %s([", aname);
        if (flags&JSON_ALL_NEWLINES) jsonNewLine(nflags, whitespace, user_callback, user_data);
        size_t length = jsvGetArrayBufferLength(var);
        bool limited = (flags&JSON_LIMIT) && (length>JSON_LIMIT_AMOUNT);
        // no newlines needed for array buffers as they only contain simple stuff

        jsvArrayBufferIteratorNew(&it, var, 0);
        while (jsvArrayBufferIteratorHasElement(&it) && !jspIsInterrupted()) {
          if (!limited || it.index<JSON_LIMITED_AMOUNT || it.index>=length-JSON_LIMITED_AMOUNT) {
            if (it.index>0) cbprintf(user_callback, user_data, (flags&JSON_PRETTY)?", ":",");
            if (flags&JSON_ALL_NEWLINES) jsonNewLine(nflags, whitespace, user_callback, user_data);
            if (limited && it.index==length-JSON_LIMITED_AMOUNT) cbprintf(user_callback, user_data, JSON_LIMIT_TEXT);
            JsVar *item = jsvArrayBufferIteratorGetValue(&it);
            jsfGetJSONWithCallback(item, nflags, whitespace, user_callback, user_data);
            jsvUnLock(item);
          }
          jsvArrayBufferIteratorNext(&it);
        }
        if (flags&JSON_ALL_NEWLINES) jsonNewLine(flags, whitespace, user_callback, user_data);
        jsvArrayBufferIteratorFree(&it);
        cbprintf(user_callback, user_data, asArray?"]":"])");
        if (isBasicArrayBuffer && !asArray) cbprintf(user_callback, user_data, ".buffer");
      }
    } else if (jsvIsObject(var)) {
      IOEventFlags device = (flags & JSON_SHOW_DEVICES) ? jsiGetDeviceFromClass(var) : EV_NONE;
      if (device!=EV_NONE) {
        cbprintf(user_callback, user_data, "%s", jshGetDeviceString(device));
      } else {
        bool showContents = true;
        if (flags & JSON_SHOW_OBJECT_NAMES) {
          JsVar *proto = jsvObjectGetChild(var, JSPARSE_INHERITS_VAR, 0);
          if (jsvHasChildren(proto)) {
            JsVar *constr = jsvObjectGetChild(proto, JSPARSE_CONSTRUCTOR_VAR, 0);
            if (constr) {
              JsVar *p = jsvGetIndexOf(execInfo.root, constr, true);
              if (p) cbprintf(user_callback, user_data, "%v: ", p);
              jsvUnLock2(p,constr);
              /* We had the constructor - now if there was a non-default toString function
               * we'll execute it and print the result */
              JsVar *toStringFn = jspGetNamedField(var, "toString", false);
              if (toStringFn && toStringFn->varData.native.ptr != (void (*)(void))jswrap_object_toString) {
                // Function found and it's not the default one - execute it
                JsVar *result = jspExecuteFunction(toStringFn,var,0,0);
                cbprintf(user_callback, user_data, "%v", result);
                jsvUnLock(result);
                showContents = false; // we already printed something
              }
              jsvUnLock(toStringFn);
            }
          }
          jsvUnLock(proto);
        }
        if (showContents) {
          JsvObjectIterator it;
          jsvObjectIteratorNew(&it, var);
          cbprintf(user_callback, user_data, (flags&JSON_PRETTY)?"{ ":"{");
          bool needNewLine = jsfGetJSONForObjectItWithCallback(&it, flags, whitespace, nflags, user_callback, user_data, true);
          jsvObjectIteratorFree(&it);
          if (needNewLine) jsonNewLine(flags, whitespace, user_callback, user_data);
          cbprintf(user_callback, user_data, (flags&JSON_PRETTY)?" }":"}");
        }
      }
    } else if (jsvIsFunction(var)) {
      if (flags & JSON_IGNORE_FUNCTIONS) {
        cbprintf(user_callback, user_data, "undefined");
      } else {
        cbprintf(user_callback, user_data, "function ");
        jsfGetJSONForFunctionWithCallback(var, nflags, user_callback, user_data);
      }
    } else if (jsvIsString(var) && !jsvIsName(var)) {
      if ((flags&JSON_LIMIT) && jsvGetStringLength(var)>JSON_LIMIT_STRING_AMOUNT) {
        // if the string is too big, split it and put dots in the middle
        JsVar *var1 = jsvNewFromStringVar(var, 0, JSON_LIMITED_STRING_AMOUNT);
        JsVar *var2 = jsvNewFromStringVar(var, jsvGetStringLength(var)-JSON_LIMITED_STRING_AMOUNT, JSON_LIMITED_STRING_AMOUNT);
        cbprintf(user_callback, user_data, "%q%s%q", var1, JSON_LIMIT_TEXT, var2);
        jsvUnLock2(var1, var2);
      } else {
        cbprintf(user_callback, user_data, "%q", var);
      }
    } else {
      cbprintf(user_callback, user_data, "%v", var);
    }

    var->flags &= ~JSV_IS_RECURSING;
  }
}
Example #6
0
void jsfGetJSONWithCallback(JsVar *var, JSONFlags flags, vcbprintf_callback user_callback, void *user_data) {
  JSONFlags nflags = flags + JSON_INDENT; // if we add a newline, make sure we indent any subsequent JSON more

  if (jsvIsUndefined(var)) {
    cbprintf(user_callback, user_data, "undefined");
  } else {
    // Use IS_RECURSING  flag to stop recursion
    if (var->flags & JSV_IS_RECURSING) {
      cbprintf(user_callback, user_data, " ... ");
      return;
    }
    var->flags |= JSV_IS_RECURSING;

    if (jsvIsArray(var)) {
      size_t length = (size_t)jsvGetArrayLength(var);
      bool limited = (flags&JSON_LIMIT) && (length>JSON_LIMIT_AMOUNT);
      bool needNewLine = false;
      size_t i;
      cbprintf(user_callback, user_data, (flags&JSON_PRETTY)?"[ ":"[");
      for (i=0;i<length && !jspIsInterrupted();i++) {
        if (!limited || i<JSON_LIMITED_AMOUNT || i>=length-JSON_LIMITED_AMOUNT) {
          if (i>0) cbprintf(user_callback, user_data, (flags&JSON_PRETTY)?", ":",");
          if (limited && i==length-JSON_LIMITED_AMOUNT) {
            if (needNewLine) jsonNewLine(nflags, user_callback, user_data);
            cbprintf(user_callback, user_data, JSON_LIMIT_TEXT);
          }
          JsVar *item = jsvGetArrayItem(var, (JsVarInt)i);
          if (jsvIsUndefined(item) && (flags&JSON_NO_UNDEFINED))
              item = jsvNewWithFlags(JSV_NULL);
          bool newNeedsNewLine = (flags&JSON_NEWLINES) && jsonNeedsNewLine(item);
          if (needNewLine || newNeedsNewLine) {
            jsonNewLine(nflags, user_callback, user_data);
            needNewLine = false;
          }
          jsfGetJSONWithCallback(item, nflags, user_callback, user_data);
          needNewLine = newNeedsNewLine;
          jsvUnLock(item);
        }
      }
      if (needNewLine) jsonNewLine(flags, user_callback, user_data);
      cbprintf(user_callback, user_data, (flags&JSON_PRETTY)?" ]":"]");
    } else if (jsvIsArrayBuffer(var)) {
      JsvArrayBufferIterator it;
      bool allZero = true;
      jsvArrayBufferIteratorNew(&it, var, 0);
      while (jsvArrayBufferIteratorHasElement(&it)) {
        if (jsvArrayBufferIteratorGetFloatValue(&it)!=0)
          allZero = false;
        jsvArrayBufferIteratorNext(&it);
      }
      jsvArrayBufferIteratorFree(&it);

      if (allZero) {
        cbprintf(user_callback, user_data, "new %s(%d)", jswGetBasicObjectName(var), jsvGetArrayBufferLength(var));
      } else {
        cbprintf(user_callback, user_data, "new %s([", jswGetBasicObjectName(var));
        size_t length = jsvGetArrayBufferLength(var);
        bool limited = (flags&JSON_LIMIT) && (length>JSON_LIMIT_AMOUNT);
        // no newlines needed for array buffers as they only contain simple stuff

        jsvArrayBufferIteratorNew(&it, var, 0);
        while (jsvArrayBufferIteratorHasElement(&it) && !jspIsInterrupted()) {
          if (!limited || it.index<JSON_LIMITED_AMOUNT || it.index>=length-JSON_LIMITED_AMOUNT) {
            if (it.index>0) cbprintf(user_callback, user_data, (flags&JSON_PRETTY)?", ":",");
            if (limited && it.index==length-JSON_LIMITED_AMOUNT) cbprintf(user_callback, user_data, JSON_LIMIT_TEXT);
            JsVar *item = jsvArrayBufferIteratorGetValue(&it);
            jsfGetJSONWithCallback(item, nflags, user_callback, user_data);
            jsvUnLock(item);
          }
          jsvArrayBufferIteratorNext(&it);
        }
        jsvArrayBufferIteratorFree(&it);
        cbprintf(user_callback, user_data, "])");
      }
    } else if (jsvIsObject(var)) {
      IOEventFlags device = (flags & JSON_SHOW_DEVICES) ? jsiGetDeviceFromClass(var) : EV_NONE;
      if (device!=EV_NONE) {
        cbprintf(user_callback, user_data, "%s", jshGetDeviceString(device));
      } else {
        bool first = true;
        bool needNewLine = false;
        size_t sinceNewLine = 0;
        JsvObjectIterator it;
        jsvObjectIteratorNew(&it, var);
        cbprintf(user_callback, user_data, (flags&JSON_PRETTY)?"{ ":"{");
        while (jsvObjectIteratorHasValue(&it) && !jspIsInterrupted()) {
          JsVar *index = jsvObjectIteratorGetKey(&it);
          JsVar *item = jsvObjectIteratorGetValue(&it);
          bool hidden = jsvIsInternalObjectKey(index) ||
                        ((flags & JSON_IGNORE_FUNCTIONS) && jsvIsFunction(item)) ||
                        ((flags&JSON_NO_UNDEFINED) && jsvIsUndefined(item));
          if (!hidden) {
            sinceNewLine++;
            if (!first) cbprintf(user_callback, user_data, (flags&JSON_PRETTY)?", ":",");
            bool newNeedsNewLine = (flags&JSON_NEWLINES) && jsonNeedsNewLine(item);
            if ((flags&JSON_NEWLINES) && sinceNewLine>JSON_ITEMS_ON_LINE_OBJECT)
              needNewLine = true;
            if (needNewLine || newNeedsNewLine) {
              jsonNewLine(nflags, user_callback, user_data);
              needNewLine = false;
              sinceNewLine = 0;
            }
            cbprintf(user_callback, user_data, (flags&JSON_PRETTY)?"%q: ":"%q:", index);
            if (first)
              first = false;
            jsfGetJSONWithCallback(item, nflags, user_callback, user_data);
            needNewLine = newNeedsNewLine;
          }
          jsvUnLock(index);
          jsvUnLock(item);
          jsvObjectIteratorNext(&it);
        }
        jsvObjectIteratorFree(&it);
        if (needNewLine) jsonNewLine(flags, user_callback, user_data);
        cbprintf(user_callback, user_data, (flags&JSON_PRETTY)?" }":"}");
      }
    } else if (jsvIsFunction(var)) {
      if (flags & JSON_IGNORE_FUNCTIONS) {
        cbprintf(user_callback, user_data, "undefined");
      } else {
        cbprintf(user_callback, user_data, "function ");
        jsfGetJSONForFunctionWithCallback(var, nflags, user_callback, user_data);
      }
    } else if (jsvIsString(var) && !jsvIsName(var)) {
      if ((flags&JSON_LIMIT) && jsvGetStringLength(var)>JSON_LIMIT_STRING_AMOUNT) {
        // if the string is too big, split it and put dots in the middle
        JsVar *var1 = jsvNewFromStringVar(var, 0, JSON_LIMITED_STRING_AMOUNT);
        JsVar *var2 = jsvNewFromStringVar(var, jsvGetStringLength(var)-JSON_LIMITED_STRING_AMOUNT, JSON_LIMITED_STRING_AMOUNT);
        cbprintf(user_callback, user_data, "%q%s%q", var1, JSON_LIMIT_TEXT, var2);
        jsvUnLock(var1);
        jsvUnLock(var2);
      } else {
        cbprintf(user_callback, user_data, "%q", var);
      }
    } else {
      cbprintf(user_callback, user_data, "%v", var);
    }

    var->flags &= ~JSV_IS_RECURSING;
  }
}
Example #7
0
/**
 Iterate over the contents of the content of a variable, calling callback for each.
 Contents may be:
 * numeric -> output
 * a string -> output each character
 * array/arraybuffer -> call itself on each element
 * {data:..., count:...} -> call itself object.count times, on object.data
 * {callback:...} -> call the given function, call itself on return value
 */
bool jsvIterateCallback(
    JsVar *data,
    jsvIterateCallbackFn callback,
    void *callbackData
  ) {
  bool ok = true;
  // Handle the data being a single numeric.
  if (jsvIsNumeric(data)) {
    callback((int)jsvGetInteger(data), callbackData);
  }
  // Handle the data being an object.
  else if (jsvIsObject(data)) {
    JsVar *callbackVar = jsvObjectGetChild(data, "callback", 0);
    if (jsvIsFunction(callbackVar)) {
      JsVar *result = jspExecuteFunction(callbackVar,0,0,NULL);
      jsvUnLock(callbackVar);
      if (result) {
        bool r = jsvIterateCallback(result, callback, callbackData);
        jsvUnLock(result);
        return r;
      }
      return true;
    }
    jsvUnLock(callbackVar);
    JsVar *countVar = jsvObjectGetChild(data, "count", 0);
    JsVar *dataVar = jsvObjectGetChild(data, "data", 0);
    if (countVar && dataVar && jsvIsNumeric(countVar)) {
      int n = (int)jsvGetInteger(countVar);
      while (ok && n-- > 0) {
        ok = jsvIterateCallback(dataVar, callback, callbackData);
      }
    } else {
      jsExceptionHere(JSET_TYPEERROR, "If specifying an object, it must be of the form {data : ..., count : N} or {callback : fn} - got %j", data);
      ok = false;
    }
    jsvUnLock2(countVar, dataVar);
  }
  // Handle the data being a string
  else if (jsvIsString(data)) {
    JsvStringIterator it;
    jsvStringIteratorNew(&it, data, 0);
    while (jsvStringIteratorHasChar(&it) && ok) {
      char ch = jsvStringIteratorGetChar(&it);
      callback(ch, callbackData);
      jsvStringIteratorNext(&it);
    }
    jsvStringIteratorFree(&it);
  }
  // Handle the data being an array buffer
  else if (jsvIsArrayBuffer(data)) {
    JsvArrayBufferIterator it;
    jsvArrayBufferIteratorNew(&it, data, 0);
    if (JSV_ARRAYBUFFER_GET_SIZE(it.type) == 1 && !JSV_ARRAYBUFFER_IS_SIGNED(it.type)) {
      JsvStringIterator *sit = &it.it;
      // faster for single byte arrays - read using the string iterator.
      while (jsvStringIteratorHasChar(sit)) {
        callback((int)(unsigned char)jsvStringIteratorGetChar(sit), callbackData);
        jsvStringIteratorNextInline(sit);
      }
    } else {
      while (jsvArrayBufferIteratorHasElement(&it)) {
        callback((int)jsvArrayBufferIteratorGetIntegerValue(&it), callbackData);
        jsvArrayBufferIteratorNext(&it);
      }
    }
    jsvArrayBufferIteratorFree(&it);
  }
  // Handle the data being iterable
  else if (jsvIsIterable(data)) {
    JsvIterator it;
    jsvIteratorNew(&it, data, JSIF_EVERY_ARRAY_ELEMENT);
    while (jsvIteratorHasElement(&it) && ok) {
      JsVar *el = jsvIteratorGetValue(&it);
      ok = jsvIterateCallback(el, callback, callbackData);
      jsvUnLock(el);
      jsvIteratorNext(&it);
    }
    jsvIteratorFree(&it);
  } else {
    jsExceptionHere(JSET_TYPEERROR, "Expecting a number or something iterable, got %t", data);
    ok = false;
  }
  return ok;
}