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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsHTMLFormatConverter.h"
#include "nsArray.h"
#include "nsCRT.h"
#include "nsIComponentManager.h"
#include "nsCOMPtr.h"
#include "nsXPCOM.h"
#include "nsISupportsPrimitives.h"
#include "nsITransferable.h" // for mime defs, this is BAD
// HTML convertor stuff
#include "nsPrimitiveHelpers.h"
#include "nsIDocumentEncoder.h"
#include "nsContentUtils.h"
nsHTMLFormatConverter::nsHTMLFormatConverter()
{
}
nsHTMLFormatConverter::~nsHTMLFormatConverter()
{
}
NS_IMPL_ISUPPORTS(nsHTMLFormatConverter, nsIFormatConverter)
//
// GetInputDataFlavors
//
// Creates a new list and returns the list of all the flavors this converter
// knows how to import. In this case, it's just HTML.
//
// Flavors (strings) are wrapped in a primitive object so that JavaScript can
// access them easily via XPConnect.
//
NS_IMETHODIMP
nsHTMLFormatConverter::GetInputDataFlavors(nsIArray **_retval)
{
if ( !_retval )
return NS_ERROR_INVALID_ARG;
nsCOMPtr<nsIMutableArray> array = nsArray::Create();
nsresult rv = AddFlavorToList ( array, kHTMLMime );
array.forget(_retval);
return rv;
} // GetInputDataFlavors
//
// GetOutputDataFlavors
//
// Creates a new list and returns the list of all the flavors this converter
// knows how to export (convert). In this case, it's all sorts of things that HTML can be
// converted to.
//
// Flavors (strings) are wrapped in a primitive object so that JavaScript can
// access them easily via XPConnect.
//
NS_IMETHODIMP
nsHTMLFormatConverter::GetOutputDataFlavors(nsIArray **_retval)
{
if ( !_retval )
return NS_ERROR_INVALID_ARG;
nsCOMPtr<nsIMutableArray> array = nsArray::Create();
nsresult rv = AddFlavorToList ( array, kHTMLMime );
if ( NS_FAILED(rv) )
return rv;
rv = AddFlavorToList ( array, kUnicodeMime );
if ( NS_FAILED(rv) )
return rv;
array.forget(_retval);
return rv;
} // GetOutputDataFlavors
//
// AddFlavorToList
//
// Convenience routine for adding a flavor wrapped in an nsISupportsCString object
// to a list
//
nsresult
nsHTMLFormatConverter :: AddFlavorToList ( nsCOMPtr<nsIMutableArray>& inList, const char* inFlavor )
{
nsresult rv;
nsCOMPtr<nsISupportsCString> dataFlavor =
do_CreateInstance(NS_SUPPORTS_CSTRING_CONTRACTID, &rv);
if ( dataFlavor ) {
dataFlavor->SetData ( nsDependentCString(inFlavor) );
// add to list as an nsISupports so the correct interface gets the addref
// in AppendElement()
nsCOMPtr<nsISupports> genericFlavor ( do_QueryInterface(dataFlavor) );
inList->AppendElement ( genericFlavor, /*weak =*/ false);
}
return rv;
} // AddFlavorToList
//
// CanConvert
//
// Determines if we support the given conversion. Currently, this method only
// converts from HTML to others.
//
NS_IMETHODIMP
nsHTMLFormatConverter::CanConvert(const char *aFromDataFlavor, const char *aToDataFlavor, bool *_retval)
{
if ( !_retval )
return NS_ERROR_INVALID_ARG;
*_retval = false;
if ( !nsCRT::strcmp(aFromDataFlavor, kHTMLMime) ) {
if ( !nsCRT::strcmp(aToDataFlavor, kHTMLMime) )
*_retval = true;
else if ( !nsCRT::strcmp(aToDataFlavor, kUnicodeMime) )
*_retval = true;
#if NOT_NOW
// pinkerton
// no one uses this flavor right now, so it's just slowing things down. If anyone cares I
// can put it back in.
else if ( toFlavor.Equals(kAOLMailMime) )
*_retval = true;
#endif
}
return NS_OK;
} // CanConvert
//
// Convert
//
// Convert data from one flavor to another. The data is wrapped in primitive objects so that it is
// accessible from JS. Currently, this only accepts HTML input, so anything else is invalid.
//
//XXX This method copies the data WAAAAY too many time for my liking. Grrrrrr. Mostly it's because
//XXX we _must_ put things into nsStrings so that the parser will accept it. Lame lame lame lame. We
//XXX also can't just get raw unicode out of the nsString, so we have to allocate heap to get
//XXX unicode out of the string. Lame lame lame.
//
NS_IMETHODIMP
nsHTMLFormatConverter::Convert(const char *aFromDataFlavor, nsISupports *aFromData, uint32_t aDataLen,
const char *aToDataFlavor, nsISupports **aToData, uint32_t *aDataToLen)
{
if ( !aToData || !aDataToLen )
return NS_ERROR_INVALID_ARG;
nsresult rv = NS_OK;
*aToData = nullptr;
*aDataToLen = 0;
if ( !nsCRT::strcmp(aFromDataFlavor, kHTMLMime) ) {
nsAutoCString toFlavor ( aToDataFlavor );
// HTML on clipboard is going to always be double byte so it will be in a primitive
// class of nsISupportsString. Also, since the data is in two byte chunks the
// length represents the length in 1-byte chars, so we need to divide by two.
nsCOMPtr<nsISupportsString> dataWrapper0 ( do_QueryInterface(aFromData) );
if (!dataWrapper0) {
return NS_ERROR_INVALID_ARG;
}
nsAutoString dataStr;
dataWrapper0->GetData ( dataStr ); // COPY #1
// note: conversion to text/plain is done inside the clipboard. we do not need to worry
// about it here.
if ( toFlavor.Equals(kHTMLMime) || toFlavor.Equals(kUnicodeMime) ) {
nsresult res;
if (toFlavor.Equals(kHTMLMime)) {
int32_t dataLen = dataStr.Length() * 2;
nsPrimitiveHelpers::CreatePrimitiveForData ( toFlavor.get(), dataStr.get(), dataLen, aToData );
if ( *aToData )
*aDataToLen = dataLen;
} else {
nsAutoString outStr;
res = ConvertFromHTMLToUnicode(dataStr, outStr);
if (NS_SUCCEEDED(res)) {
int32_t dataLen = outStr.Length() * 2;
nsPrimitiveHelpers::CreatePrimitiveForData ( toFlavor.get(), outStr.get(), dataLen, aToData );
if ( *aToData )
*aDataToLen = dataLen;
}
}
} // else if HTML or Unicode
else if ( toFlavor.Equals(kAOLMailMime) ) {
nsAutoString outStr;
if ( NS_SUCCEEDED(ConvertFromHTMLToAOLMail(dataStr, outStr)) ) {
int32_t dataLen = outStr.Length() * 2;
nsPrimitiveHelpers::CreatePrimitiveForData ( toFlavor.get(), outStr.get(), dataLen, aToData );
if ( *aToData )
*aDataToLen = dataLen;
}
} // else if AOL mail
else {
rv = NS_ERROR_FAILURE;
}
} // if we got html mime
else
rv = NS_ERROR_FAILURE;
return rv;
} // Convert
//
// ConvertFromHTMLToUnicode
//
// Takes HTML and converts it to plain text but in unicode.
//
NS_IMETHODIMP
nsHTMLFormatConverter::ConvertFromHTMLToUnicode(const nsAutoString & aFromStr, nsAutoString & aToStr)
{
return nsContentUtils::ConvertToPlainText(aFromStr,
aToStr,
nsIDocumentEncoder::OutputSelectionOnly |
nsIDocumentEncoder::OutputAbsoluteLinks |
nsIDocumentEncoder::OutputNoScriptContent |
nsIDocumentEncoder::OutputNoFramesContent,
0);
} // ConvertFromHTMLToUnicode
NS_IMETHODIMP
nsHTMLFormatConverter::ConvertFromHTMLToAOLMail(const nsAutoString & aFromStr,
nsAutoString & aToStr)
{
aToStr.AssignLiteral("<HTML>");
aToStr.Append(aFromStr);
aToStr.AppendLiteral("</HTML>");
return NS_OK;
}
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