diff options
Diffstat (limited to 'widget/nsHTMLFormatConverter.cpp')
| -rw-r--r-- | widget/nsHTMLFormatConverter.cpp | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/widget/nsHTMLFormatConverter.cpp b/widget/nsHTMLFormatConverter.cpp new file mode 100644 index 0000000000..4898fd2c8b --- /dev/null +++ b/widget/nsHTMLFormatConverter.cpp @@ -0,0 +1,184 @@ +/* -*- 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 "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; + } +#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, + const char* aToDataFlavor, + nsISupports** aToData) { + if (!aToData) return NS_ERROR_INVALID_ARG; + + nsresult rv = NS_OK; + *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); // 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(kTextMime)) { + nsresult res; + if (toFlavor.Equals(kHTMLMime)) { + int32_t dataLen = dataStr.Length() * 2; + nsPrimitiveHelpers::CreatePrimitiveForData(toFlavor, dataStr.get(), + dataLen, aToData); + } else { + nsAutoString outStr; + res = ConvertFromHTMLToUnicode(dataStr, outStr); + if (NS_SUCCEEDED(res)) { + int32_t dataLen = outStr.Length() * 2; + nsPrimitiveHelpers::CreatePrimitiveForData(toFlavor, outStr.get(), + dataLen, aToData); + } + } + } // 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, outStr.get(), + dataLen, aToData); + } + } // 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; +} |