/* -----------------------------------------------------------------------------
 * dhead.swg
 *
 * Support code for exceptions if the SWIG_D_NO_EXCEPTION_HELPER is not defined
 * Support code for strings if the SWIG_D_NO_STRING_HELPER is not defined
 *
 * Support code for function pointers. ----------------------------------------------------------------------------- */

%insert(runtime) %{
#include <stdlib.h>
#include <string.h>
#include <stdio.h>

/* Contract support. */
#define SWIG_contract_assert(nullreturn, expr, msg) if (!(expr)) {SWIG_DSetPendingException(SWIG_DException, msg); return nullreturn; } else
%}


/*
 * Exception support code.
 */

#if !defined(SWIG_D_NO_EXCEPTION_HELPER)
%insert(runtime) %{
// Support for throwing D exceptions from C/C++.
typedef enum {
  SWIG_DException = 0,
  SWIG_DIllegalArgumentException,
  SWIG_DIllegalElementException,
  SWIG_DIOException,
  SWIG_DNoSuchElementException,
} SWIG_DExceptionCodes;

typedef void (* SWIG_DExceptionCallback_t)(const char *);

typedef struct {
  SWIG_DExceptionCodes code;
  SWIG_DExceptionCallback_t callback;
} SWIG_DException_t;

static SWIG_DException_t SWIG_d_exceptions[] = {
  { SWIG_DException, NULL },
  { SWIG_DIllegalArgumentException, NULL },
  { SWIG_DIllegalElementException, NULL },
  { SWIG_DIOException, NULL },
  { SWIG_DNoSuchElementException, NULL }
};

static void SWIGUNUSED SWIG_DSetPendingException(SWIG_DExceptionCodes code, const char *msg) {
  if ((size_t)code < sizeof(SWIG_d_exceptions)/sizeof(SWIG_DException_t)) {
    SWIG_d_exceptions[code].callback(msg);
  } else {
    SWIG_d_exceptions[SWIG_DException].callback(msg);
  }
}

#ifdef __cplusplus
extern "C"
#endif
SWIGEXPORT void SWIGRegisterExceptionCallbacks_$module(
  SWIG_DExceptionCallback_t exceptionCallback,
  SWIG_DExceptionCallback_t illegalArgumentCallback,
  SWIG_DExceptionCallback_t illegalElementCallback,
  SWIG_DExceptionCallback_t ioCallback,
  SWIG_DExceptionCallback_t noSuchElementCallback) {
  SWIG_d_exceptions[SWIG_DException].callback = exceptionCallback;
  SWIG_d_exceptions[SWIG_DIllegalArgumentException].callback = illegalArgumentCallback;
  SWIG_d_exceptions[SWIG_DIllegalElementException].callback = illegalElementCallback;
  SWIG_d_exceptions[SWIG_DIOException].callback = ioCallback;
  SWIG_d_exceptions[SWIG_DNoSuchElementException].callback = noSuchElementCallback;
}
%}

#if (SWIG_D_VERSION == 1)
%pragma(d) imdmoduleimports=%{
// Exception throwing support currently requires Tango, but there is no reason
// why it could not support Phobos.
static import tango.core.Exception;
static import tango.core.Thread;
static import tango.stdc.stringz;
%}

%pragma(d) imdmodulecode=%{
private class SwigExceptionHelper {
  static this() {
    swigRegisterExceptionCallbacks$module(
      &setException,
      &setIllegalArgumentException,
      &setIllegalElementException,
      &setIOException,
      &setNoSuchElementException);
  }

  static void setException(const char* message) {
    auto exception = new object.Exception(tango.stdc.stringz.fromStringz(message).dup);
    exception.next = SwigPendingException.retrieve();
    SwigPendingException.set(exception);
  }

  static void setIllegalArgumentException(const char* message) {
    auto exception = new tango.core.Exception.IllegalArgumentException(tango.stdc.stringz.fromStringz(message).dup);
    exception.next = SwigPendingException.retrieve();
    SwigPendingException.set(exception);
  }

  static void setIllegalElementException(const char* message) {
    auto exception = new tango.core.Exception.IllegalElementException(tango.stdc.stringz.fromStringz(message).dup);
    exception.next = SwigPendingException.retrieve();
    SwigPendingException.set(exception);
  }

  static void setIOException(const char* message) {
    auto exception = new tango.core.Exception.IOException(tango.stdc.stringz.fromStringz(message).dup);
    exception.next = SwigPendingException.retrieve();
    SwigPendingException.set(exception);
  }

  static void setNoSuchElementException(const char* message) {
    auto exception = new tango.core.Exception.NoSuchElementException(tango.stdc.stringz.fromStringz(message).dup);
    exception.next = SwigPendingException.retrieve();
    SwigPendingException.set(exception);
  }
}

package class SwigPendingException {
public:
  static this() {
    m_sPendingCount = 0;
    m_sPendingException = new ThreadLocalData(null);
  }

  static bool isPending() {
    bool pending = false;
    if (m_sPendingCount > 0) {
      if (m_sPendingException.val !is null) {
        pending = true;
      }
    }
    return pending;
  }

  static void set(object.Exception e) {
    if (m_sPendingException.val !is null) {
      throw new object.Exception("FATAL: An earlier pending exception from C/C++ code " ~
        "was missed and thus not thrown (" ~ m_sPendingException.val.classinfo.name ~
        ": " ~ m_sPendingException.val.msg ~ ")!", e);
    }

    m_sPendingException.val = e;
    synchronized {
      ++m_sPendingCount;
    }
  }

  static object.Exception retrieve() {
    object.Exception e = null;
    if (m_sPendingCount > 0) {
      if (m_sPendingException.val !is null) {
        e = m_sPendingException.val;
        m_sPendingException.val = null;
        synchronized {
          --m_sPendingCount;
        }
      }
    }
    return e;
  }

private:
  // The pending exception counter is stored thread-global.
  static int m_sPendingCount;

  // The reference to the pending exception (if any) is stored thread-local.
  alias tango.core.Thread.ThreadLocal!(object.Exception) ThreadLocalData;
  static ThreadLocalData m_sPendingException;
}
alias void function(const char* message) SwigExceptionCallback;
%}
#else
%pragma(d) imdmoduleimports=%{
static import std.conv;
%}

%pragma(d) imdmodulecode=%{
private class SwigExceptionHelper {
  static this() {
	// The D1/Tango version maps C++ exceptions to multiple exception types.
    swigRegisterExceptionCallbacks$module(
      &setException,
      &setException,
      &setException,
      &setException,
      &setException
    );
  }

  static void setException(const char* message) {
    auto exception = new object.Exception(std.conv.to!string(message).idup);
    exception.next = SwigPendingException.retrieve();
    SwigPendingException.set(exception);
  }
}

package struct SwigPendingException {
public:
  static this() {
    m_sPendingCount = 0;
    m_sPendingException = null;
  }

  static bool isPending() {
    bool pending = false;
    if (m_sPendingCount > 0) {
      if (m_sPendingException !is null) {
        pending = true;
      }
    }
    return pending;
  }

  static void set(object.Exception e) {
    if (m_sPendingException !is null) {
      throw new object.Exception("FATAL: An earlier pending exception from C/C++ code " ~
        "was missed and thus not thrown (" ~ m_sPendingException.classinfo.name ~
        ": " ~ m_sPendingException.msg ~ ")!", e);
    }

    m_sPendingException = e;
    synchronized {
      ++m_sPendingCount;
    }
  }

  static object.Exception retrieve() {
    object.Exception e = null;
    if (m_sPendingCount > 0) {
      if (m_sPendingException !is null) {
        e = m_sPendingException;
        m_sPendingException = null;
        synchronized {
          --m_sPendingCount;
        }
      }
    }
    return e;
  }

private:
  // The pending exception counter is stored thread-global.
  static shared int m_sPendingCount;

  // The reference to the pending exception (if any) is stored thread-local.
  static object.Exception m_sPendingException;
}
alias void function(const char* message) SwigExceptionCallback;
%}
#endif
// Callback registering function in wrapperloader.swg.
#endif // SWIG_D_NO_EXCEPTION_HELPER


/*
 * String support code.
 */

#if !defined(SWIG_D_NO_STRING_HELPER)
%insert(runtime) %{
// Callback for returning strings to D without leaking memory.
typedef char * (* SWIG_DStringHelperCallback)(const char *);
static SWIG_DStringHelperCallback SWIG_d_string_callback = NULL;

#ifdef __cplusplus
extern "C"
#endif
SWIGEXPORT void SWIGRegisterStringCallback_$module(SWIG_DStringHelperCallback callback) {
  SWIG_d_string_callback = callback;
}
%}

#if (SWIG_D_VERSION == 1)
%pragma(d) imdmoduleimports = "static import tango.stdc.stringz;";

%pragma(d) imdmodulecode = %{
private class SwigStringHelper {
  static this() {
    swigRegisterStringCallback$module(&createString);
  }

  static char* createString(char* cString) {
    // We are effectively dup'ing the string here.
    return tango.stdc.stringz.toStringz(tango.stdc.stringz.fromStringz(cString));
  }
}
alias char* function(char* cString) SwigStringCallback;
%}
#else
%pragma(d) imdmoduleimports = %{
static import std.conv;
static import std.string;
%}

%pragma(d) imdmodulecode = %{
private class SwigStringHelper {
  static this() {
    swigRegisterStringCallback$module(&createString);
  }

  static const(char)* createString(const(char*) cString) {
    // We are effectively dup'ing the string here.
    // TODO: Is this also correct for D2/Phobos?
    return std.string.toStringz(std.conv.to!string(cString));
  }
}
alias const(char)* function(const(char*) cString) SwigStringCallback;
%}
#endif
// Callback registering function in wrapperloader.swg.
#endif // SWIG_D_NO_STRING_HELPER


/*
 * Function pointer support code.
 */
#if (SWIG_D_VERSION == 1)
%pragma(d) imdmodulecode = %{
template SwigExternC(T) {
  static if (is(typeof(*(T.init)) R == return)) {
    static if (is(typeof(*(T.init)) P == function)) {
      alias extern(C) R function(P) SwigExternC;
    }
  }
}
%}
#else
%pragma(d) imdmodulecode = %{
template SwigExternC(T) if (is(typeof(*(T.init)) P == function)) {
  static if (is(typeof(*(T.init)) R == return)) {
    static if (is(typeof(*(T.init)) P == function)) {
      alias extern(C) R function(P) SwigExternC;
    }
  }
}
%}
#endif