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

310 строки
9.2 KiB
C++
Исходник Ответственный История

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* 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 "nsTXTToHTMLConv.h"
#include "nsEscape.h"
#include "nsStringStream.h"
#include "nsAutoPtr.h"
#include "nsIChannel.h"
#include <algorithm>
#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(bool value)
{
mPreFormatHTML = value;
return NS_OK;
}
// nsIStreamListener method
NS_IMETHODIMP
nsTXTToHTMLConv::OnDataAvailable(nsIRequest* request, nsISupports *aContext,
nsIInputStream *aInStream,
uint64_t aOffset, uint32_t aCount)
{
nsresult rv = NS_OK;
nsString pushBuffer;
uint32_t amtRead = 0;
nsAutoArrayPtr<char> buffer(new char[aCount+1]);
if (!buffer) return NS_ERROR_OUT_OF_MEMORY;
do {
uint32_t 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;
int32_t 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);
}
int32_t end = mBuffer.RFind(TOKEN_DELIMITERS, mBuffer.Length());
mBuffer.Left(pushBuffer, std::max(cursor, end));
mBuffer.Cut(0, std::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 = nullptr;
mPreFormatHTML = 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 = 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 = 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 = 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 = 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 = true;
token->token.Assign(PRUnichar('@'));
token->modText.AssignLiteral("mailto:");
mTokens.AppendElement(token);
return rv;
}
int32_t
nsTXTToHTMLConv::FindToken(int32_t cursor, convToken* *_retval)
{
int32_t loc = -1, firstToken = mBuffer.Length();
int8_t token = -1;
for (uint8_t 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;
}
int32_t
nsTXTToHTMLConv::CatHTML(int32_t front, int32_t back)
{
int32_t cursor = 0;
int32_t 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 = nullptr; // indicates completeness
return cursor;
}
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