lqml/src/cpp/marshal.cpp

#include "marshal.h"
#include <QColor>
#include <QUrl>
#include <QVariant>
#include <QObject>

QT_BEGIN_NAMESPACE

static void warning_msg(const char* message, cl_object l_args) {
  STATIC_SYMBOL (s_error_output, "*ERROR-OUTPUT*")
  cl_format(4,
            cl_symbol_value(s_error_output),
            STRING("~%[LQML:warning] ~A ~S~%"),
            STRING(message),
            l_args);
}

// *** Lisp to Qt ***

template<typename T>
T toInt(cl_object l_num) {
  T i = 0;
  if (cl_integerp(l_num) == ECL_T) {
    i = fixint(l_num);
  }
  return i;
}

int toInt(cl_object l_num) {
  return toInt<int>(l_num);
}

template<typename T>
T toUInt(cl_object l_num) {
  T i = 0;
  if (cl_integerp(l_num) == ECL_T) {
    i = fixnnint(l_num);
  }
  return i;
}

uint toUInt(cl_object l_num) {
  return toUInt<uint>(l_num);
}

template<typename T>
T toFloat(cl_object l_num) {
  T f = 0;
  if (ECL_SINGLE_FLOAT_P(l_num)) {
    f = sf(l_num);
  } else if (ECL_DOUBLE_FLOAT_P(l_num)) {
    f = df(l_num);
  }
#ifdef ECL_LONG_FLOAT
  else if (ECL_LONG_FLOAT_P(l_num)) {
    f = ecl_long_float(l_num);
  }
#endif
  else if (cl_integerp(l_num) == ECL_T) {
    f = fixint(l_num);
  } else {
    cl_object l_f = cl_float(1, l_num);
    if (ECL_DOUBLE_FLOAT_P(l_f)) {
      f = df(l_f);
    } else if (ECL_SINGLE_FLOAT_P(l_f)) {
      f = sf(l_f);
    }
#ifdef ECL_LONG_FLOAT
    else if (ECL_LONG_FLOAT_P(l_f)) {
      f = ecl_long_float(l_f);
    }
#endif
  }
  return f;
}

float toFloat(cl_object l_num) {
  return toFloat<float>(l_num);
}

qreal toReal(cl_object l_num) {
  return toFloat<qreal>(l_num);
}

QByteArray toCString(cl_object l_str) {
  QByteArray ba;
  if (ECL_STRINGP(l_str)) {
    if (ECL_BASE_STRING_P(l_str)) {
      ba = QByteArray(reinterpret_cast<char*>(l_str->base_string.self),
                      l_str->base_string.fillp);
    } else {
      uint l = l_str->string.fillp;
      ba.resize(l);
      ecl_character* l_s = l_str->string.self;
      for (uint i = 0; i < l; i++) {
        ba[i] = l_s[i];
      }
    }
  }
  return ba;
}

QByteArray toQByteArray(cl_object l_vec) {
  QByteArray ba;
  if (ECL_VECTORP(l_vec)) {
    int len = LEN(l_vec);
    ba.resize(len);
    for (int i = 0; i < len; i++) {
      ba[i] = toInt(ecl_aref(l_vec, i));
    }
  }
  return ba;
}

QString toQString(cl_object l_str) {
  QString s;
  if (ECL_STRINGP(l_str)) {
    if (ECL_BASE_STRING_P(l_str)) {
      s = QString::fromLatin1(reinterpret_cast<char*>(l_str->base_string.self),
                              l_str->base_string.fillp);
    } else {
      uint l = l_str->string.fillp;
      s.resize(l);
      ecl_character* l_s = l_str->string.self;
      for (uint i = 0; i < l; i++) {
        s[i] = QChar(l_s[i]);
      }
    }
  }
  return s;
}

TO_QT_2 (QPoint, toInt)
TO_QT_2 (QSize,  toInt)
TO_QT_4 (QRect,  toInt)

TO_QT_2 (QPointF, toFloat)
TO_QT_2 (QSizeF,  toFloat)
TO_QT_4 (QRectF,  toFloat)

QVariant toQVariant(cl_object l_arg, int type) {
  QVariant var;
  switch (type) {
    case QMetaType::QByteArray: var = toQByteArray(l_arg);      break;
    case QMetaType::QColor:     var = QColor(toQString(l_arg)); break;
    case QMetaType::QPoint:     var = toQPoint(l_arg);          break;
    case QMetaType::QPointF:    var = toQPointF(l_arg);         break;
    case QMetaType::QRect:      var = toQRect(l_arg);           break;
    case QMetaType::QRectF:     var = toQRectF(l_arg);          break;
    case QMetaType::QSize:      var = toQSize(l_arg);           break;
    case QMetaType::QSizeF:     var = toQSizeF(l_arg);          break;
    case QMetaType::QUrl:       var = QUrl(toQString(l_arg));   break;
    case QMetaType::QObjectStar: {
        QObject* o = toQObjectPointer(l_arg);
        var = QVariant::fromValue<QObject*>(o);     // QObject*
      }
      break;
    default:
    if (cl_integerp(l_arg) == ECL_T) {              // int
      var = QVariant(toInt(l_arg));
    } else if (cl_floatp(l_arg) == ECL_T) {         // double
      var = QVariant(toFloat<double>(l_arg));
    } else if (cl_stringp(l_arg) == ECL_T) {        // string
      var = QVariant(toQString(l_arg));
    } else if (cl_characterp(l_arg) == ECL_T) {     // char
      var = QChar(toInt(cl_char_code(l_arg)));
    } else if (l_arg == ECL_T) {                    // true
      var = QVariant(true);
    } else if (l_arg == ECL_NIL) {                  // false
      var = QVariant(false);
    } else if (cl_listp(l_arg) == ECL_T) {          // list
      var = (cl_keywordp(cl_first(l_arg)) == ECL_T)
            ? toQVariantMap(l_arg)
            : toQVariantList(l_arg);
    } else if (cl_vectorp(l_arg) == ECL_T) {        // vector (of octets)
      var = QVariant(toQByteArray(l_arg));
    } else {
      QObject* o = toQObjectPointer(l_arg);
      if (o != nullptr) {
        var = QVariant::fromValue<QObject*>(o);     // e.g. QQuickItem*
      } else {
        var = QVariant();                           // default: undefined
      }
    }
  }
  return var;
}

QVariantList toQVariantList(cl_object l_list) {
  QVariantList l;
  if (ECL_LISTP(l_list)) {
    for (cl_object l_do_list = l_list; l_do_list != ECL_NIL; l_do_list = cl_cdr(l_do_list)) {
      cl_object l_el = cl_car(l_do_list);
      l << toQVariant(l_el);
    }
  }
  return l;
}

QString toCamelCase(const QString& name) {
  // convert Lisp name to Qt name
  QString qtName(name);
  int j = 0;
  for (int i = 0; i < name.length(); i++, j++) {
    qtName[j] = (name.at(i) == QChar('-'))
                ? name.at(++i).toUpper() : name.at(i);
  }
  qtName.truncate(j);
  return qtName;
}

QVariant toQVariantMap(cl_object l_list) {
  // special case for JS dictionary, for e.g. populating a Model in QML
  QVariantMap map;
  cl_object l_do_args = l_list;
  while (l_do_args != ECL_NIL) {
    cl_object l_keyword = cl_first(l_do_args);
    if (cl_keywordp(l_keyword) == ECL_T) {
      map.insert(toCamelCase(toQString(cl_symbol_name(l_keyword)).toLower()),
                 toQVariant(cl_second(l_do_args)));
      l_do_args = cl_cddr(l_do_args);
    } else {
      // might not be an error, e.g. unintended return value of Lisp.call()
      warning_msg("conversion to QVariantMap failed", l_list);
      break;
    }
  }
  return map;
}

QObject* toQObjectPointer(cl_object l_obj) {
  STATIC_SYMBOL_PKG (s_qt_object_p,       "QT-OBJECT-P",       "QML") // see 'ini.lisp'
  STATIC_SYMBOL_PKG (s_qt_object_address, "QT-OBJECT-ADDRESS", "QML")
  if (cl_funcall(2, s_qt_object_p, l_obj) != ECL_NIL) {
    return reinterpret_cast<QObject*>(toUInt<quintptr>(cl_funcall(2, s_qt_object_address, l_obj)));
  }
  return nullptr;
}



// *** Qt to Lisp ***

cl_object from_cstring(const QByteArray& s) {
  cl_object l_s = ecl_alloc_simple_base_string(s.length());
  memcpy(l_s->base_string.self, s.constData(), s.length());
  return l_s;
}

cl_object from_qbytearray(const QByteArray& ba) {
  STATIC_SYMBOL_PKG (s_make_byte_vector, "%MAKE-BYTE-VECTOR", "QML") // see 'ini.lisp'
  cl_object l_list = Cnil;
  for (int i = 0; i < ba.size(); i++) {
    l_list = CONS(ecl_make_fixnum(static_cast<uchar>(ba.at(i))), l_list);
  }
  cl_object l_vec = cl_funcall(2, s_make_byte_vector, cl_nreverse(l_list));
  return l_vec;
}

cl_object from_qchar(const QChar& ch) {
  cl_object l_char = cl_code_char(ecl_make_fixnum(ch.unicode()));
  return l_char;
}

cl_object from_qstring(const QString& s) {
  cl_object l_s = ecl_alloc_simple_extended_string(s.length());
  ecl_character* l_p = l_s->string.self;
  for (int i = 0; i < s.length(); i++) {
    l_p[i] = s.at(i).unicode();
  }
  return l_s;
}

TO_CL_2 (QPoint, qpoint, ecl_make_fixnum, x, y)
TO_CL_2 (QSize,  qsize,  ecl_make_fixnum, width, height)
TO_CL_4 (QRect,  qrect,  ecl_make_fixnum, x, y, width, height)

TO_CL_2 (QPointF, qpointf, ecl_make_doublefloat, x, y)
TO_CL_2 (QSizeF,  qsizef,  ecl_make_doublefloat, width, height)
TO_CL_4 (QRectF,  qrectf,  ecl_make_doublefloat, x, y, width, height)

cl_object from_qvariant(const QVariant& var) {
  cl_object l_obj = ECL_NIL;
#if QT_VERSION < 0x060000
  const int type = var.type();
#else
  const int type = var.typeId();
#endif
  if ((type == QMetaType::QObjectStar) || // QObject*
      (type >= QMetaType::User)) {        // e.g. QQuickItem*
    QObject* o = var.value<QObject*>();
    if (o != nullptr) {
      l_obj = from_qobject_pointer(o);
    }
  } else {
    switch (type) {
      case QMetaType::Bool:       l_obj = var.toBool() ? ECL_T : ECL_NIL;               break;
      case QMetaType::Double:     l_obj = ecl_make_doublefloat(var.toDouble());         break;
      case QMetaType::Int:        l_obj = ecl_make_integer(var.toInt());                break;
      case QMetaType::UInt:       l_obj = ecl_make_unsigned_integer(var.toUInt());      break;
      case QMetaType::ULongLong:  l_obj = ecl_make_unsigned_integer(var.toULongLong()); break;
      case QMetaType::QByteArray: l_obj = from_qbytearray(var.toByteArray());           break;
      case QMetaType::QChar:      l_obj = from_qchar(var.toChar());                     break;
      case QMetaType::QColor:     l_obj = from_qstring(var.value<QColor>().name());     break;
      case QMetaType::QPoint:     l_obj = from_qpoint(var.toPoint());                   break;
      case QMetaType::QPointF:    l_obj = from_qpointf(var.toPointF());                 break;
      case QMetaType::QRect:      l_obj = from_qrect(var.toRect());                     break;
      case QMetaType::QRectF:     l_obj = from_qrectf(var.toRectF());                   break;
      case QMetaType::QSize:      l_obj = from_qsize(var.toSize());                     break;
      case QMetaType::QSizeF:     l_obj = from_qsizef(var.toSizeF());                   break;
      case QMetaType::QString:
      case QMetaType::QUrl:       l_obj = from_qstring(var.toString());                 break;
      // special case (can be nested)
      case QMetaType::QVariantList:
        QVariantList list(var.value<QVariantList>());
        for (QVariant v : qAsConst(list)) {
          l_obj = CONS(from_qvariant(v), l_obj);
        }
        l_obj = cl_nreverse(l_obj);
      break;
    }
  }
  return l_obj;
}

cl_object from_qobject_pointer(QObject* qobject) {
  STATIC_SYMBOL_PKG (s_qt_object, "QT-OBJECT", "QML") // see 'ini.lisp'
  return cl_funcall(2,
                    s_qt_object,
                    ecl_make_unsigned_integer(reinterpret_cast<quintptr>(qobject)));
}

QT_END_NAMESPACE