SystemCallReadFile.cpp

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#ifndef _MADARA_NO_KARL_
 
#include "madara/expression/LeafNode.h"
#include "madara/expression/SystemCallReadFile.h"
#include "madara/expression/Visitor.h"
 
madara::expression::SystemCallReadFile::SystemCallReadFile(
    madara::knowledge::ThreadSafeContext& context, const ComponentNodes& nodes)
  : SystemCallNode(context, nodes)
{
}
 
// Dtor
madara::expression::SystemCallReadFile::~SystemCallReadFile(void) {}
 
madara::knowledge::KnowledgeRecord madara::expression::SystemCallReadFile::item(
    void) const
{
  return madara::knowledge::KnowledgeRecord(nodes_.size());
}
 
madara::knowledge::KnowledgeRecord
madara::expression::SystemCallReadFile::prune(bool& can_change)
{
  // user can always change a function, and we have no control over
  // what it does. Consequently, a function node cannot be pruned out
  // under any situation
  can_change = true;
 
  madara::knowledge::KnowledgeRecord result;
 
  for (ComponentNodes::iterator i = nodes_.begin(); i != nodes_.end(); ++i)
  {
    bool arg_can_change = false;
    result = (*i)->prune(arg_can_change);
 
    if (!arg_can_change && dynamic_cast<LeafNode*>(*i) == 0)
    {
      delete *i;
      *i = new LeafNode(*(this->logger_), result);
    }
  }
 
  if (nodes_.size() == 0 || nodes_.size() > 2)
  {
    madara_logger_ptr_log(logger_, logger::LOG_ERROR,
        "madara::expression::SystemCallRandInt: "
        "KARL COMPILE ERROR:"
        "System call read_file"
        " requires at least a filename to read, e.g."
        " #read_file (filename), #read_file (filename, 'text')."
        " Second argument is to force a file type when the filename"
        " does not end with .txt, .xml, .jpg, etc. Can be 'text',"
        " 'jpeg', 'xml'\n");
 
    throw exceptions::KarlException(
        "madara::expression::SystemCallRandInt: "
        "KARL COMPILE ERROR: "
        "System call read_file"
        " requires at least a filename to read, e.g."
        " #read_file (filename), #read_file (filename, 'text')."
        " Second argument is to force a file type when the filename"
        " does not end with .txt, .xml, .jpg, etc. Can be 'text',"
        " 'jpeg', 'xml'\n");
  }
 
  return result;
}
 
madara::knowledge::KnowledgeRecord
madara::expression::SystemCallReadFile::evaluate(
    const madara::knowledge::KnowledgeUpdateSettings& settings)
{
  knowledge::KnowledgeRecord return_value;
 
  if (nodes_.size() > 0)
  {
    // copying strings wastes execution time, so we hold the
    // knowledge::KnowledgeRecord instead of the resulting string filename.
    knowledge::KnowledgeRecord filename_eval = nodes_[0]->evaluate(settings);
    uint32_t read_as_type_uint(0);
    (void)read_as_type_uint;
 
    madara_logger_ptr_log(logger_, logger::LOG_MINOR,
        "madara::expression::SystemCallReadFile: "
        "System call read_file is attempting to open %s.\n",
        filename_eval.to_string().c_str());
 
    if (nodes_.size() == 2)
    {
      knowledge::KnowledgeRecord read_as_type = nodes_[1]->evaluate(settings);
      if (read_as_type.type() == knowledge::KnowledgeRecord::INTEGER)
      {
        read_as_type_uint = (uint32_t)read_as_type.to_integer();
      }
      else if (read_as_type.is_string_type())
      {
        std::string type = read_as_type.to_string();
        if (type == "text")
        {
          read_as_type_uint = knowledge::KnowledgeRecord::TEXT_FILE;
        }
        else if (type == "jpeg")
        {
          read_as_type_uint = knowledge::KnowledgeRecord::IMAGE_JPEG;
        }
        else if (type == "xml")
        {
          read_as_type_uint = knowledge::KnowledgeRecord::XML;
        }
      }
    }
 
    if (0 != return_value.read_file(filename_eval.to_string()))
    {
      madara_logger_ptr_log(logger_, logger::LOG_WARNING,
          "madara::expression::SystemCallReadFile: "
          "KARL RUNTIME WARNING: System call read_file could not open %s.\n",
          filename_eval.to_string().c_str());
    }
  }
  else
  {
    madara_logger_ptr_log(logger_, logger::LOG_ERROR,
        "madara::expression::SystemCallReadFile: "
        "KARL COMPILE ERROR:"
        "System call read_file"
        " requires at least a filename to read, e.g."
        " #read_file (filename), #read_file (filename, 'text')."
        " Second argument is to force a file type when the filename"
        " does not end with .txt, .xml, .jpg, etc. Can be 'text',"
        " 'jpeg', 'xml'\n");
 
    throw exceptions::KarlException(
        "madara::expression::SystemCallReadFile: "
        "KARL COMPILE ERROR: "
        "System call read_file"
        " requires at least a filename to read, e.g."
        " #read_file (filename), #read_file (filename, 'text')."
        " Second argument is to force a file type when the filename"
        " does not end with .txt, .xml, .jpg, etc. Can be 'text',"
        " 'jpeg', 'xml'\n");
  }
 
  return return_value;
}
 
// accept a visitor
void madara::expression::SystemCallReadFile::accept(
    madara::expression::Visitor& visitor) const
{
  visitor.visit(*this);
}
 
#endif  // _MADARA_NO_KARL_