firefox-main/widget/nsHTMLFormatConverter.cpp (file symbol)

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/* 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 "nsCOMPtr.h"
#include "nsITransferable.h"
#include "nsLiteralString.h"
#include "nsXPCOM.h"
#include "nsISupportsPrimitives.h"
// HTML convertor stuff
#include "nsPrimitiveHelpers.h"
#include "nsIDocumentEncoder.h"
#include "nsContentUtils.h"
nsHTMLFormatConverter::nsHTMLFormatConverter() = default;
nsHTMLFormatConverter::~nsHTMLFormatConverter() = default;
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.
//
NS_IMETHODIMP
nsHTMLFormatConverter::GetInputDataFlavors(nsTArray<nsCString>& aFlavors) {
aFlavors.AppendElement(nsLiteralCString(kHTMLMime));
return NS_OK;
}
//
// 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.
//
NS_IMETHODIMP
nsHTMLFormatConverter::GetOutputDataFlavors(nsTArray<nsCString>& aFlavors) {
aFlavors.AppendElement(nsLiteralCString(kHTMLMime));
aFlavors.AppendElement(nsLiteralCString(kTextMime));
return NS_OK;
}
//
// 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, kTextMime)) {
*_retval = true;
}
}
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,
const char* aToDataFlavor,
nsISupports** aToData) {
if (!aToData) {
return NS_ERROR_INVALID_ARG;
}
*aToData = nullptr;
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);
// 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(kTextMime)) {
nsAutoString outStr = dataStr;
if (toFlavor.Equals(kTextMime)) {
nsresult res = ConvertFromHTMLToUnicode(dataStr, outStr);
if (NS_FAILED(res)) {
return NS_ERROR_FAILURE;
}
}
auto len = outStr.Length();
if (len > std::numeric_limits<size_t>::max() / 2) {
return NS_ERROR_FAILURE;
}
size_t dataLen = len * 2;
nsPrimitiveHelpers::CreatePrimitiveForData(toFlavor, outStr.get(),
dataLen, aToData);
return NS_OK;
}
}
return NS_ERROR_FAILURE;
}
//
// 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;
}