purezen 0.0.2

Runtime for the Pure Data (Pd) audio programming language, implemented as an extensible audio library allowing full control over signal processing, message passing, and graph manipulation. Pure Data is a graph-based programming language environment creating interactive music and multimedia works.
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/*
 *  Copyright 2010,2011 Reality Jockey, Ltd.
 *                 info@rjdj.me
 *                 http://rjdj.me/
 *
 *  This file is part of ZenGarden.
 *
 *  ZenGarden is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Lesser General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  ZenGarden is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with ZenGarden.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#include "MessageListAppend.h"
#include "MessageListLength.h"
#include "MessageListPrepend.h"
#include "MessageListSplit.h"
#include "MessageListTrim.h"

// MessageListAppend is the default factor for all list objects
message::Object *MessageListAppend::new_object(pd::Message *init_message, PdGraph *graph) {
  if (init_message->is_symbol(0)) {
    if (init_message->is_symbol_str(0, "append") ||
        init_message->is_symbol_str(0, "prepend") ||
        init_message->is_symbol_str(0, "split")) {
      int numElements = init_message->get_num_elements()-1;
      pd::Message *message = PD_MESSAGE_ON_STACK(numElements);
      message->from_timestamp(0.0, numElements);
      memcpy(message->get_element(0), init_message->get_element(1), numElements*sizeof(pd::message::Atom));
      message::Object *message_obj = NULL;
      if (init_message->is_symbol_str(0, "append")) {
        message_obj = new MessageListAppend(message, graph);
      } else if (init_message->is_symbol_str(0, "prepend")) {
        message_obj = new MessageListPrepend(message, graph);
      } else if (init_message->is_symbol_str(0, "split")) {
        message_obj = new MessageListSplit(message, graph);
      }
      return message_obj;
    } else if (init_message->is_symbol_str(0, "trim")) {
      // trim and length do not act on the init_message
      return new MessageListTrim(init_message, graph);
    } else if (init_message->is_symbol_str(0, "length")) {
      return new MessageListLength(init_message, graph);
    } else {
      return new MessageListAppend(init_message, graph);
    }
  } else {
    return new MessageListAppend(init_message, graph);
  }
}

MessageListAppend::MessageListAppend(pd::Message *init_message, PdGraph *graph) : message::Object(2, 1, graph) {
  appendMessage = init_message->clone_on_heap();
}

MessageListAppend::~MessageListAppend() {
  appendMessage->free_message();
}

bool MessageListAppend::should_distribute_message_to_inlets() {
  return false;
}

void MessageListAppend::process_message(int inlet_index, pd::Message *message) {
  switch (inlet_index) {
    case 0: {
      // if the incoming message is a bang, then it is considered to be a list of length zero
      int numMessageElements = (!message->is_bang(0)) ? message->get_num_elements() : 0;
      int numAppendElements = appendMessage->get_num_elements();
      int numTotalElements = numMessageElements + numAppendElements;
      if (numTotalElements > 0) {
        pd::Message *outgoing_message = PD_MESSAGE_ON_STACK(numTotalElements);
        outgoing_message->from_timestamp(message->get_timestamp(), numTotalElements);
        memcpy(outgoing_message->get_element(0), message->get_element(0), numMessageElements*sizeof(pd::message::Atom));
        memcpy(outgoing_message->get_element(numMessageElements), appendMessage->get_element(0), numAppendElements*sizeof(pd::message::Atom));
        send_message(0, outgoing_message);
      } else {
        pd::Message *outgoing_message = PD_MESSAGE_ON_STACK(1);
        outgoing_message->from_timestamp_and_bang(message->get_timestamp());
        send_message(0, outgoing_message);
      }
      break;
    }
    case 1: {
      if (message->is_bang(0)) {
        // bangs are considered a list of size zero
        appendMessage->free_message();
        pd::Message *message = PD_MESSAGE_ON_STACK(0);
        message->from_timestamp(0.0, 0);
        appendMessage = message->clone_on_heap();
      } else {
        appendMessage->free_message();
        appendMessage = message->clone_on_heap();
      }
      break;
    }
    default: {
      break;
    }
  }
}