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327 lines
10 KiB
C++
327 lines
10 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsTXTToHTMLConv.h"
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#include "nsNetUtil.h"
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#include "nsStringStream.h"
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#include "nsAutoPtr.h"
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#define TOKEN_DELIMITERS NS_LITERAL_STRING("\t\r\n ").get()
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// nsISupports methods
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NS_IMPL_ISUPPORTS4(nsTXTToHTMLConv,
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nsIStreamConverter,
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nsITXTToHTMLConv,
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nsIRequestObserver,
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nsIStreamListener)
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// nsIStreamConverter methods
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NS_IMETHODIMP
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nsTXTToHTMLConv::Convert(nsIInputStream *aFromStream,
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const char *aFromType, const char *aToType,
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nsISupports *aCtxt, nsIInputStream * *_retval)
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{
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return NS_ERROR_NOT_IMPLEMENTED;
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}
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NS_IMETHODIMP
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nsTXTToHTMLConv::AsyncConvertData(const char *aFromType,
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const char *aToType,
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nsIStreamListener *aListener,
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nsISupports *aCtxt)
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{
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NS_ASSERTION(aListener, "null pointer");
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mListener = aListener;
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return NS_OK;
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}
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// nsIRequestObserver methods
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NS_IMETHODIMP
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nsTXTToHTMLConv::OnStartRequest(nsIRequest* request, nsISupports *aContext)
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{
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mBuffer.AssignLiteral("<html>\n<head><title>");
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mBuffer.Append(mPageTitle);
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mBuffer.AppendLiteral("</title></head>\n<body>\n");
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if (mPreFormatHTML) { // Use <pre> tags
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mBuffer.AppendLiteral("<pre>\n");
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}
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// Push mBuffer to the listener now, so the initial HTML will not
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// be parsed in OnDataAvailable().
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nsCOMPtr<nsIChannel> channel = do_QueryInterface(request);
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if (channel)
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channel->SetContentType(NS_LITERAL_CSTRING("text/html"));
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// else, assume there is a channel somewhere that knows what it is doing!
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nsresult rv = mListener->OnStartRequest(request, aContext);
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if (NS_FAILED(rv)) return rv;
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// The request may have been canceled, and if that happens, we want to
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// suppress calls to OnDataAvailable.
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request->GetStatus(&rv);
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if (NS_FAILED(rv)) return rv;
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nsCOMPtr<nsIInputStream> inputData;
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rv = NS_NewStringInputStream(getter_AddRefs(inputData), mBuffer);
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if (NS_FAILED(rv)) return rv;
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rv = mListener->OnDataAvailable(request, aContext,
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inputData, 0, mBuffer.Length());
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if (NS_FAILED(rv)) return rv;
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mBuffer.Truncate();
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return rv;
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}
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NS_IMETHODIMP
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nsTXTToHTMLConv::OnStopRequest(nsIRequest* request, nsISupports *aContext,
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nsresult aStatus)
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{
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nsresult rv = NS_OK;
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if (mToken) {
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// we still have an outstanding token
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NS_ASSERTION(mToken->prepend,
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"Non prepending tokens should be handled in "
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"OnDataAvailable. There should only be a single "
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"prepending token left to be processed.");
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(void)CatHTML(0, mBuffer.Length());
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}
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if (mPreFormatHTML) {
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mBuffer.AppendLiteral("</pre>\n");
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}
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mBuffer.AppendLiteral("\n</body></html>");
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nsCOMPtr<nsIInputStream> inputData;
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rv = NS_NewStringInputStream(getter_AddRefs(inputData), mBuffer);
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if (NS_FAILED(rv)) return rv;
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rv = mListener->OnDataAvailable(request, aContext,
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inputData, 0, mBuffer.Length());
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if (NS_FAILED(rv)) return rv;
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return mListener->OnStopRequest(request, aContext, aStatus);
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}
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// nsITXTToHTMLConv methods
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NS_IMETHODIMP
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nsTXTToHTMLConv::SetTitle(const PRUnichar *aTitle)
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{
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mPageTitle.Assign(aTitle);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsTXTToHTMLConv::PreFormatHTML(PRBool value)
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{
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mPreFormatHTML = value;
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return NS_OK;
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}
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// nsIStreamListener method
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NS_IMETHODIMP
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nsTXTToHTMLConv::OnDataAvailable(nsIRequest* request, nsISupports *aContext,
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nsIInputStream *aInStream,
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PRUint32 aOffset, PRUint32 aCount)
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{
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nsresult rv = NS_OK;
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nsString pushBuffer;
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PRUint32 amtRead = 0;
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nsAutoArrayPtr<char> buffer(new char[aCount+1]);
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if (!buffer) return NS_ERROR_OUT_OF_MEMORY;
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do {
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PRUint32 read = 0;
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// XXX readSegments, to avoid the first copy?
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rv = aInStream->Read(buffer, aCount-amtRead, &read);
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if (NS_FAILED(rv)) return rv;
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buffer[read] = '\0';
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// XXX charsets?? non-latin1 characters?? utf-16??
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AppendASCIItoUTF16(buffer, mBuffer);
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amtRead += read;
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PRInt32 front = -1, back = -1, tokenLoc = -1, cursor = 0;
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while ( (tokenLoc = FindToken(cursor, &mToken)) > -1) {
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if (mToken->prepend) {
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front = mBuffer.RFindCharInSet(TOKEN_DELIMITERS, tokenLoc);
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front++;
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back = mBuffer.FindCharInSet(TOKEN_DELIMITERS, tokenLoc);
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} else {
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front = tokenLoc;
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back = front + mToken->token.Length();
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}
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if (back == -1) {
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// didn't find an ending, buffer up.
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mBuffer.Left(pushBuffer, front);
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cursor = front;
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break;
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}
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// found the end of the token.
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cursor = CatHTML(front, back);
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}
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PRInt32 end = mBuffer.RFind(TOKEN_DELIMITERS, mBuffer.Length());
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mBuffer.Left(pushBuffer, PR_MAX(cursor, end));
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mBuffer.Cut(0, PR_MAX(cursor, end));
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cursor = 0;
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if (!pushBuffer.IsEmpty()) {
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nsCOMPtr<nsIInputStream> inputData;
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rv = NS_NewStringInputStream(getter_AddRefs(inputData), pushBuffer);
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if (NS_FAILED(rv))
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return rv;
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rv = mListener->OnDataAvailable(request, aContext,
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inputData, 0, pushBuffer.Length());
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if (NS_FAILED(rv))
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return rv;
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}
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} while (amtRead < aCount);
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return rv;
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}
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// nsTXTToHTMLConv methods
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nsTXTToHTMLConv::nsTXTToHTMLConv()
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{
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mToken = nsnull;
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mPreFormatHTML = PR_FALSE;
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}
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nsTXTToHTMLConv::~nsTXTToHTMLConv()
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{
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mTokens.Clear();
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}
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nsresult
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nsTXTToHTMLConv::Init()
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{
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nsresult rv = NS_OK;
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// build up the list of tokens to handle
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convToken *token = new convToken;
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if (!token) return NS_ERROR_OUT_OF_MEMORY;
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token->prepend = PR_FALSE;
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token->token.Assign(PRUnichar('<'));
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token->modText.AssignLiteral("<");
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mTokens.AppendElement(token);
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token = new convToken;
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if (!token) return NS_ERROR_OUT_OF_MEMORY;
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token->prepend = PR_FALSE;
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token->token.Assign(PRUnichar('>'));
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token->modText.AssignLiteral(">");
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mTokens.AppendElement(token);
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token = new convToken;
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if (!token) return NS_ERROR_OUT_OF_MEMORY;
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token->prepend = PR_FALSE;
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token->token.Assign(PRUnichar('&'));
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token->modText.AssignLiteral("&");
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mTokens.AppendElement(token);
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token = new convToken;
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if (!token) return NS_ERROR_OUT_OF_MEMORY;
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token->prepend = PR_TRUE;
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token->token.AssignLiteral("http://"); // XXX need to iterate through all protos
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mTokens.AppendElement(token);
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token = new convToken;
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if (!token) return NS_ERROR_OUT_OF_MEMORY;
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token->prepend = PR_TRUE;
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token->token.Assign(PRUnichar('@'));
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token->modText.AssignLiteral("mailto:");
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mTokens.AppendElement(token);
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return rv;
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}
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PRInt32
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nsTXTToHTMLConv::FindToken(PRInt32 cursor, convToken* *_retval)
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{
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PRInt32 loc = -1, firstToken = mBuffer.Length();
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PRInt8 token = -1;
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for (PRUint8 i=0; i < mTokens.Length(); i++) {
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loc = mBuffer.Find(mTokens[i]->token, cursor);
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if (loc != -1)
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if (loc < firstToken) {
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firstToken = loc;
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token = i;
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}
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}
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if (token == -1)
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return -1;
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*_retval = mTokens[token];
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return firstToken;
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}
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PRInt32
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nsTXTToHTMLConv::CatHTML(PRInt32 front, PRInt32 back)
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{
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PRInt32 cursor = 0;
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PRInt32 modLen = mToken->modText.Length();
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if (!mToken->prepend) {
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// replace the entire token (from delimiter to delimiter)
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mBuffer.Cut(front, back - front);
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mBuffer.Insert(mToken->modText, front);
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cursor = front+modLen;
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} else {
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nsString linkText;
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// href is implied
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mBuffer.Mid(linkText, front, back-front);
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mBuffer.Insert(NS_LITERAL_STRING("<a href=\""), front);
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cursor += front+9;
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if (modLen)
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mBuffer.Insert(mToken->modText, cursor);
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cursor += modLen-front+back;
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mBuffer.Insert(NS_LITERAL_STRING("\">"), cursor);
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cursor += 2;
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mBuffer.Insert(linkText, cursor);
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cursor += linkText.Length();
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mBuffer.Insert(NS_LITERAL_STRING("</a>"), cursor);
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cursor += 4;
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}
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mToken = nsnull; // indicates completeness
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return cursor;
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}
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