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null_prompt_service.cpp

// Copyright 2006 Ben Hutchings <ben@decadent.org.uk>.
// See the file "COPYING" for licence details.

#include <new>
#include <string>

#include <langinfo.h>

#include <nsCOMPtr.h>
#include <nsICharsetConverterManager.h>
#include <nsIComponentManager.h>
#include <nsIFactory.h>
#include <nsIComponentRegistrar.h>
#include <nsServiceManagerUtils.h>
#include <nsIUnicodeEncoder.h>

#include "null_prompt_service.hpp"
#include "videolink.hpp"
#include "xpcom_support.hpp"

using xpcom_support::check;

namespace
{
    NS_DEFINE_IID(prompt_service_iid, NS_IPROMPTSERVICE_IID);

    class null_prompt_service_factory : public nsIFactory
    {
      NS_DECL_ISUPPORTS
      NS_DECL_NSIFACTORY
    };

    NS_IMPL_ISUPPORTS1(null_prompt_service_factory, nsIFactory)

    NS_IMETHODIMP null_prompt_service_factory::CreateInstance(
      nsISupports *, const nsIID & iid, void ** result)
    {
      if (!iid.Equals(prompt_service_iid))
          return NS_ERROR_NO_INTERFACE;

      if (null_prompt_service * service =
              new (std::nothrow) null_prompt_service)
      {
          service->AddRef();
          *result = service;
          return NS_OK;
      }
      else
      {
          return NS_ERROR_OUT_OF_MEMORY;
      }
    }

    NS_IMETHODIMP null_prompt_service_factory::LockFactory(PRBool /*lock*/)
    {
      return NS_ERROR_NOT_IMPLEMENTED;
    }

    std::string native_error_string(const PRUnichar * text)
    {
      std::string result;
      PRInt32 text_len = 0;
      while (text[text_len])
          ++text_len;

      nsCOMPtr<nsICharsetConverterManager> conv_manager;
      nsCOMPtr<nsIUnicodeEncoder> encoder;
      static const nsCID charset_converter_manager_cid =
          NS_ICHARSETCONVERTERMANAGER_CID;
      if (NS_SUCCEEDED(CallGetService<nsICharsetConverterManager>(
                       charset_converter_manager_cid,
                       getter_AddRefs(conv_manager)))
          && NS_SUCCEEDED(conv_manager->GetUnicodeEncoder(
                        nl_langinfo(CODESET),
                        getter_AddRefs(encoder))))
      {
          encoder->SetOutputErrorBehavior(
            nsIUnicodeEncoder::kOnError_Replace, NULL, PRUnichar('?'));

          char buf[1000];  // Hopefully long enough for an error message

          char * out = buf;
          PRInt32 out_len = sizeof(buf);
          encoder->Convert(text, &text_len, out, &out_len);
          out += out_len;

          out_len = sizeof(buf) - out_len;
          encoder->Finish(out, &out_len);
          out += out_len;

          result.assign(buf, out);
      }
      else
      {
          // Convert to ASCII
          result.resize(text_len);
          for (PRInt32 i = 0; i != text_len; ++i)
            result[i] = (text[i] < 0x80) ? text[i] : '?';
      }

      return result;
    }
}

NS_IMPL_ISUPPORTS1(null_prompt_service, nsIPromptService)

NS_IMETHODIMP null_prompt_service::Alert(
    nsIDOMWindow *, const PRUnichar *, const PRUnichar * text)
{
    fatal_error(native_error_string(text));
    return NS_OK;
}

NS_IMETHODIMP null_prompt_service::AlertCheck(
    nsIDOMWindow *, const PRUnichar *, const PRUnichar * text,
    const PRUnichar *, PRBool *)
{
    fatal_error(native_error_string(text));
    return NS_OK;
}

NS_IMETHODIMP null_prompt_service::Confirm(
    nsIDOMWindow *, const PRUnichar *, const PRUnichar *, PRBool * result)
{
    // Cancel
    *result = false;
    return NS_OK;
}

NS_IMETHODIMP null_prompt_service::ConfirmCheck(
    nsIDOMWindow *, const PRUnichar *, const PRUnichar *,
    const PRUnichar *, PRBool *, PRBool * result)
{
    // Cancel
    *result = false;
    return NS_OK;
}

NS_IMETHODIMP null_prompt_service::ConfirmEx(
    nsIDOMWindow *, const PRUnichar *, const PRUnichar *,
    PRUint32 flags, const PRUnichar *, const PRUnichar *, const PRUnichar *,
    const PRUnichar *, PRBool *, PRInt32 * result)
{
    // Accept the default
    if (flags & BUTTON_POS_1_DEFAULT)
      *result = 1;
    else if (flags & BUTTON_POS_2_DEFAULT)
      *result = 2;
    else
      *result = 0;
    return NS_OK;
}

NS_IMETHODIMP null_prompt_service::Prompt(
    nsIDOMWindow *, const PRUnichar *, const PRUnichar *, PRUnichar **,
    const PRUnichar *, PRBool *, PRBool * result)
{
    // Cancel
    *result = false;
    return NS_OK;
}

NS_IMETHODIMP null_prompt_service::PromptUsernameAndPassword(
    nsIDOMWindow *, const PRUnichar *, const PRUnichar *,
    PRUnichar **, PRUnichar **, const PRUnichar *, PRBool *, PRBool * result)
{
    // Cancel
    *result = false;
    return NS_OK;
}

NS_IMETHODIMP null_prompt_service::PromptPassword(
    nsIDOMWindow *, const PRUnichar *, const PRUnichar *, PRUnichar **,
    const PRUnichar *, PRBool *, PRBool * result)
{
    // Cancel
    *result = false;
    return NS_OK;
}

NS_IMETHODIMP null_prompt_service::Select(
    nsIDOMWindow *, const PRUnichar *, const PRUnichar *, PRUint32,
    const PRUnichar **, PRInt32 *, PRBool * result)
{
    // Cancel
    *result = false;
    return NS_OK;
}

void null_prompt_service::install()
{
    static const nsCID prompt_service_cid = {
      0xa2112d6a, 0x0e28, 0x421f,
      {0xb4, 0x6a, 0x25, 0xc0, 0xb3, 0x8, 0xcb, 0xd0}
    };
    nsCOMPtr<nsIFactory> prompt_factory(new null_prompt_service_factory);
    nsCOMPtr<nsIComponentRegistrar> comp_registrar;
    check(NS_GetComponentRegistrar(getter_AddRefs(comp_registrar)));
    check(comp_registrar->RegisterFactory(
            prompt_service_cid,
            "Prompt Service",
            "@mozilla.org/embedcomp/prompt-service;1",
            prompt_factory));   
}

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