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gecko-dev/netwerk/streamconv/converters/nsTXTToHTMLConv.cpp

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11 KiB
C++
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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsTXTToHTMLConv.h"
#include "nsNetUtil.h"
#include "nsEscape.h"
#include "nsStringStream.h"
#include "nsAutoPtr.h"
#define TOKEN_DELIMITERS NS_LITERAL_STRING("\t\r\n ").get()
// nsISupports methods
NS_IMPL_ISUPPORTS4(nsTXTToHTMLConv,
nsIStreamConverter,
nsITXTToHTMLConv,
nsIRequestObserver,
nsIStreamListener)
// nsIStreamConverter methods
NS_IMETHODIMP
nsTXTToHTMLConv::Convert(nsIInputStream *aFromStream,
const char *aFromType, const char *aToType,
nsISupports *aCtxt, nsIInputStream * *_retval)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
nsTXTToHTMLConv::AsyncConvertData(const char *aFromType,
const char *aToType,
nsIStreamListener *aListener,
nsISupports *aCtxt)
{
NS_ASSERTION(aListener, "null pointer");
mListener = aListener;
return NS_OK;
}
// nsIRequestObserver methods
NS_IMETHODIMP
nsTXTToHTMLConv::OnStartRequest(nsIRequest* request, nsISupports *aContext)
{
mBuffer.AssignLiteral("<html>\n<head><title>");
mBuffer.Append(mPageTitle);
mBuffer.AppendLiteral("</title></head>\n<body>\n");
if (mPreFormatHTML) { // Use <pre> tags
mBuffer.AppendLiteral("<pre>\n");
}
// Push mBuffer to the listener now, so the initial HTML will not
// be parsed in OnDataAvailable().
nsCOMPtr<nsIChannel> channel = do_QueryInterface(request);
if (channel)
channel->SetContentType(NS_LITERAL_CSTRING("text/html"));
// else, assume there is a channel somewhere that knows what it is doing!
nsresult rv = mListener->OnStartRequest(request, aContext);
if (NS_FAILED(rv)) return rv;
// The request may have been canceled, and if that happens, we want to
// suppress calls to OnDataAvailable.
request->GetStatus(&rv);
if (NS_FAILED(rv)) return rv;
nsCOMPtr<nsIInputStream> inputData;
rv = NS_NewStringInputStream(getter_AddRefs(inputData), mBuffer);
if (NS_FAILED(rv)) return rv;
rv = mListener->OnDataAvailable(request, aContext,
inputData, 0, mBuffer.Length());
if (NS_FAILED(rv)) return rv;
mBuffer.Truncate();
return rv;
}
NS_IMETHODIMP
nsTXTToHTMLConv::OnStopRequest(nsIRequest* request, nsISupports *aContext,
nsresult aStatus)
{
nsresult rv = NS_OK;
if (mToken) {
// we still have an outstanding token
NS_ASSERTION(mToken->prepend,
"Non prepending tokens should be handled in "
"OnDataAvailable. There should only be a single "
"prepending token left to be processed.");
(void)CatHTML(0, mBuffer.Length());
}
if (mPreFormatHTML) {
mBuffer.AppendLiteral("</pre>\n");
}
mBuffer.AppendLiteral("\n</body></html>");
nsCOMPtr<nsIInputStream> inputData;
rv = NS_NewStringInputStream(getter_AddRefs(inputData), mBuffer);
if (NS_FAILED(rv)) return rv;
rv = mListener->OnDataAvailable(request, aContext,
inputData, 0, mBuffer.Length());
if (NS_FAILED(rv)) return rv;
return mListener->OnStopRequest(request, aContext, aStatus);
}
// nsITXTToHTMLConv methods
NS_IMETHODIMP
nsTXTToHTMLConv::SetTitle(const PRUnichar *aTitle)
{
mPageTitle.Assign(aTitle);
return NS_OK;
}
NS_IMETHODIMP
nsTXTToHTMLConv::PreFormatHTML(PRBool value)
{
mPreFormatHTML = value;
return NS_OK;
}
// nsIStreamListener method
NS_IMETHODIMP
nsTXTToHTMLConv::OnDataAvailable(nsIRequest* request, nsISupports *aContext,
nsIInputStream *aInStream,
PRUint32 aOffset, PRUint32 aCount)
{
nsresult rv = NS_OK;
nsString pushBuffer;
PRUint32 amtRead = 0;
nsAutoArrayPtr<char> buffer(new char[aCount+1]);
if (!buffer) return NS_ERROR_OUT_OF_MEMORY;
do {
PRUint32 read = 0;
// XXX readSegments, to avoid the first copy?
rv = aInStream->Read(buffer, aCount-amtRead, &read);
if (NS_FAILED(rv)) return rv;
buffer[read] = '\0';
// XXX charsets?? non-latin1 characters?? utf-16??
AppendASCIItoUTF16(buffer, mBuffer);
amtRead += read;
PRInt32 front = -1, back = -1, tokenLoc = -1, cursor = 0;
while ( (tokenLoc = FindToken(cursor, &mToken)) > -1) {
if (mToken->prepend) {
front = mBuffer.RFindCharInSet(TOKEN_DELIMITERS, tokenLoc);
front++;
back = mBuffer.FindCharInSet(TOKEN_DELIMITERS, tokenLoc);
} else {
front = tokenLoc;
back = front + mToken->token.Length();
}
if (back == -1) {
// didn't find an ending, buffer up.
mBuffer.Left(pushBuffer, front);
cursor = front;
break;
}
// found the end of the token.
cursor = CatHTML(front, back);
}
PRInt32 end = mBuffer.RFind(TOKEN_DELIMITERS, mBuffer.Length());
mBuffer.Left(pushBuffer, PR_MAX(cursor, end));
mBuffer.Cut(0, PR_MAX(cursor, end));
cursor = 0;
if (!pushBuffer.IsEmpty()) {
nsCOMPtr<nsIInputStream> inputData;
rv = NS_NewStringInputStream(getter_AddRefs(inputData), pushBuffer);
if (NS_FAILED(rv))
return rv;
rv = mListener->OnDataAvailable(request, aContext,
inputData, 0, pushBuffer.Length());
if (NS_FAILED(rv))
return rv;
}
} while (amtRead < aCount);
return rv;
}
// nsTXTToHTMLConv methods
nsTXTToHTMLConv::nsTXTToHTMLConv()
{
mToken = nsnull;
mPreFormatHTML = PR_FALSE;
}
nsTXTToHTMLConv::~nsTXTToHTMLConv()
{
mTokens.Clear();
}
nsresult
nsTXTToHTMLConv::Init()
{
nsresult rv = NS_OK;
// build up the list of tokens to handle
convToken *token = new convToken;
if (!token) return NS_ERROR_OUT_OF_MEMORY;
token->prepend = PR_FALSE;
token->token.Assign(PRUnichar('<'));
token->modText.AssignLiteral("&lt;");
mTokens.AppendElement(token);
token = new convToken;
if (!token) return NS_ERROR_OUT_OF_MEMORY;
token->prepend = PR_FALSE;
token->token.Assign(PRUnichar('>'));
token->modText.AssignLiteral("&gt;");
mTokens.AppendElement(token);
token = new convToken;
if (!token) return NS_ERROR_OUT_OF_MEMORY;
token->prepend = PR_FALSE;
token->token.Assign(PRUnichar('&'));
token->modText.AssignLiteral("&amp;");
mTokens.AppendElement(token);
token = new convToken;
if (!token) return NS_ERROR_OUT_OF_MEMORY;
token->prepend = PR_TRUE;
token->token.AssignLiteral("http://"); // XXX need to iterate through all protos
mTokens.AppendElement(token);
token = new convToken;
if (!token) return NS_ERROR_OUT_OF_MEMORY;
token->prepend = PR_TRUE;
token->token.Assign(PRUnichar('@'));
token->modText.AssignLiteral("mailto:");
mTokens.AppendElement(token);
return rv;
}
PRInt32
nsTXTToHTMLConv::FindToken(PRInt32 cursor, convToken* *_retval)
{
PRInt32 loc = -1, firstToken = mBuffer.Length();
PRInt8 token = -1;
for (PRUint8 i=0; i < mTokens.Length(); i++) {
loc = mBuffer.Find(mTokens[i]->token, cursor);
if (loc != -1)
if (loc < firstToken) {
firstToken = loc;
token = i;
}
}
if (token == -1)
return -1;
*_retval = mTokens[token];
return firstToken;
}
PRInt32
nsTXTToHTMLConv::CatHTML(PRInt32 front, PRInt32 back)
{
PRInt32 cursor = 0;
PRInt32 modLen = mToken->modText.Length();
if (!mToken->prepend) {
// replace the entire token (from delimiter to delimiter)
mBuffer.Cut(front, back - front);
mBuffer.Insert(mToken->modText, front);
cursor = front+modLen;
} else {
nsString linkText;
// href is implied
mBuffer.Mid(linkText, front, back-front);
mBuffer.Insert(NS_LITERAL_STRING("<a href=\""), front);
cursor += front+9;
if (modLen) {
mBuffer.Insert(mToken->modText, cursor);
cursor += modLen;
}
NS_ConvertUTF16toUTF8 linkTextUTF8(linkText);
nsCString escaped;
if (NS_EscapeURL(linkTextUTF8.Data(), linkTextUTF8.Length(), esc_Minimal, escaped)) {
mBuffer.Cut(cursor, back - front);
CopyUTF8toUTF16(escaped, linkText);
mBuffer.Insert(linkText, cursor);
back = front + linkText.Length();
}
cursor += back-front;
mBuffer.Insert(NS_LITERAL_STRING("\">"), cursor);
cursor += 2;
mBuffer.Insert(linkText, cursor);
cursor += linkText.Length();
mBuffer.Insert(NS_LITERAL_STRING("</a>"), cursor);
cursor += 4;
}
mToken = nsnull; // indicates completeness
return cursor;
}
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