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comparison: netwerk/streamconv/converters/nsTXTToHTMLConv.cpp

netwerk/streamconv/converters/nsTXTToHTMLConv.cpp

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TOR_BUG_9701
changeset 9
a63d609f5ebe
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-1:000000000000 0:8c149a6f8875
1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
2 /* This Source Code Form is subject to the terms of the Mozilla Public
3 * License, v. 2.0. If a copy of the MPL was not distributed with this
4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
5
6 #include "nsTXTToHTMLConv.h"
7 #include "nsEscape.h"
8 #include "nsStringStream.h"
9 #include "nsAutoPtr.h"
10 #include "nsIChannel.h"
11 #include <algorithm>
12
13 #define TOKEN_DELIMITERS MOZ_UTF16("\t\r\n ")
14
15 // nsISupports methods
16 NS_IMPL_ISUPPORTS(nsTXTToHTMLConv,
17 nsIStreamConverter,
18 nsITXTToHTMLConv,
19 nsIRequestObserver,
20 nsIStreamListener)
21
22
23 // nsIStreamConverter methods
24 NS_IMETHODIMP
25 nsTXTToHTMLConv::Convert(nsIInputStream *aFromStream,
26 const char *aFromType, const char *aToType,
27 nsISupports *aCtxt, nsIInputStream * *_retval)
28 {
29 return NS_ERROR_NOT_IMPLEMENTED;
30 }
31
32 NS_IMETHODIMP
33 nsTXTToHTMLConv::AsyncConvertData(const char *aFromType,
34 const char *aToType,
35 nsIStreamListener *aListener,
36 nsISupports *aCtxt)
37 {
38 NS_ASSERTION(aListener, "null pointer");
39 mListener = aListener;
40 return NS_OK;
41 }
42
43
44 // nsIRequestObserver methods
45 NS_IMETHODIMP
46 nsTXTToHTMLConv::OnStartRequest(nsIRequest* request, nsISupports *aContext)
47 {
48 mBuffer.AssignLiteral("<html>\n<head><title>");
49 mBuffer.Append(mPageTitle);
50 mBuffer.AppendLiteral("</title></head>\n<body>\n");
51 if (mPreFormatHTML) { // Use <pre> tags
52 mBuffer.AppendLiteral("<pre>\n");
53 }
54
55 // Push mBuffer to the listener now, so the initial HTML will not
56 // be parsed in OnDataAvailable().
57
58 nsCOMPtr<nsIChannel> channel = do_QueryInterface(request);
59 if (channel)
60 channel->SetContentType(NS_LITERAL_CSTRING("text/html"));
61 // else, assume there is a channel somewhere that knows what it is doing!
62
63 nsresult rv = mListener->OnStartRequest(request, aContext);
64 if (NS_FAILED(rv)) return rv;
65
66 // The request may have been canceled, and if that happens, we want to
67 // suppress calls to OnDataAvailable.
68 request->GetStatus(&rv);
69 if (NS_FAILED(rv)) return rv;
70
71 nsCOMPtr<nsIInputStream> inputData;
72 rv = NS_NewStringInputStream(getter_AddRefs(inputData), mBuffer);
73 if (NS_FAILED(rv)) return rv;
74
75 rv = mListener->OnDataAvailable(request, aContext,
76 inputData, 0, mBuffer.Length());
77 if (NS_FAILED(rv)) return rv;
78 mBuffer.Truncate();
79 return rv;
80 }
81
82 NS_IMETHODIMP
83 nsTXTToHTMLConv::OnStopRequest(nsIRequest* request, nsISupports *aContext,
84 nsresult aStatus)
85 {
86 nsresult rv = NS_OK;
87 if (mToken) {
88 // we still have an outstanding token
89 NS_ASSERTION(mToken->prepend,
90 "Non prepending tokens should be handled in "
91 "OnDataAvailable. There should only be a single "
92 "prepending token left to be processed.");
93 (void)CatHTML(0, mBuffer.Length());
94 }
95 if (mPreFormatHTML) {
96 mBuffer.AppendLiteral("</pre>\n");
97 }
98 mBuffer.AppendLiteral("\n</body></html>");
99
100 nsCOMPtr<nsIInputStream> inputData;
101
102 rv = NS_NewStringInputStream(getter_AddRefs(inputData), mBuffer);
103 if (NS_FAILED(rv)) return rv;
104
105 rv = mListener->OnDataAvailable(request, aContext,
106 inputData, 0, mBuffer.Length());
107 if (NS_FAILED(rv)) return rv;
108
109 return mListener->OnStopRequest(request, aContext, aStatus);
110 }
111
112 // nsITXTToHTMLConv methods
113 NS_IMETHODIMP
114 nsTXTToHTMLConv::SetTitle(const char16_t *aTitle)
115 {
116 mPageTitle.Assign(aTitle);
117 return NS_OK;
118 }
119
120 NS_IMETHODIMP
121 nsTXTToHTMLConv::PreFormatHTML(bool value)
122 {
123 mPreFormatHTML = value;
124 return NS_OK;
125 }
126
127 // nsIStreamListener method
128 NS_IMETHODIMP
129 nsTXTToHTMLConv::OnDataAvailable(nsIRequest* request, nsISupports *aContext,
130 nsIInputStream *aInStream,
131 uint64_t aOffset, uint32_t aCount)
132 {
133 nsresult rv = NS_OK;
134 nsString pushBuffer;
135 uint32_t amtRead = 0;
136 nsAutoArrayPtr<char> buffer(new char[aCount+1]);
137 if (!buffer) return NS_ERROR_OUT_OF_MEMORY;
138
139 do {
140 uint32_t read = 0;
141 // XXX readSegments, to avoid the first copy?
142 rv = aInStream->Read(buffer, aCount-amtRead, &read);
143 if (NS_FAILED(rv)) return rv;
144
145 buffer[read] = '\0';
146 // XXX charsets?? non-latin1 characters?? utf-16??
147 AppendASCIItoUTF16(buffer, mBuffer);
148 amtRead += read;
149
150 int32_t front = -1, back = -1, tokenLoc = -1, cursor = 0;
151
152 while ( (tokenLoc = FindToken(cursor, &mToken)) > -1) {
153 if (mToken->prepend) {
154 front = mBuffer.RFindCharInSet(TOKEN_DELIMITERS, tokenLoc);
155 front++;
156 back = mBuffer.FindCharInSet(TOKEN_DELIMITERS, tokenLoc);
157 } else {
158 front = tokenLoc;
159 back = front + mToken->token.Length();
160 }
161 if (back == -1) {
162 // didn't find an ending, buffer up.
163 mBuffer.Left(pushBuffer, front);
164 cursor = front;
165 break;
166 }
167 // found the end of the token.
168 cursor = CatHTML(front, back);
169 }
170
171 int32_t end = mBuffer.RFind(TOKEN_DELIMITERS, mBuffer.Length());
172 mBuffer.Left(pushBuffer, std::max(cursor, end));
173 mBuffer.Cut(0, std::max(cursor, end));
174 cursor = 0;
175
176 if (!pushBuffer.IsEmpty()) {
177 nsCOMPtr<nsIInputStream> inputData;
178
179 rv = NS_NewStringInputStream(getter_AddRefs(inputData), pushBuffer);
180 if (NS_FAILED(rv))
181 return rv;
182
183 rv = mListener->OnDataAvailable(request, aContext,
184 inputData, 0, pushBuffer.Length());
185 if (NS_FAILED(rv))
186 return rv;
187 }
188 } while (amtRead < aCount);
189
190 return rv;
191 }
192
193 // nsTXTToHTMLConv methods
194 nsTXTToHTMLConv::nsTXTToHTMLConv()
195 {
196 mToken = nullptr;
197 mPreFormatHTML = false;
198 }
199
200 nsTXTToHTMLConv::~nsTXTToHTMLConv()
201 {
202 mTokens.Clear();
203 }
204
205 nsresult
206 nsTXTToHTMLConv::Init()
207 {
208 nsresult rv = NS_OK;
209
210 // build up the list of tokens to handle
211 convToken *token = new convToken;
212 if (!token) return NS_ERROR_OUT_OF_MEMORY;
213 token->prepend = false;
214 token->token.Assign(char16_t('<'));
215 token->modText.AssignLiteral("&lt;");
216 mTokens.AppendElement(token);
217
218 token = new convToken;
219 if (!token) return NS_ERROR_OUT_OF_MEMORY;
220 token->prepend = false;
221 token->token.Assign(char16_t('>'));
222 token->modText.AssignLiteral("&gt;");
223 mTokens.AppendElement(token);
224
225 token = new convToken;
226 if (!token) return NS_ERROR_OUT_OF_MEMORY;
227 token->prepend = false;
228 token->token.Assign(char16_t('&'));
229 token->modText.AssignLiteral("&amp;");
230 mTokens.AppendElement(token);
231
232 token = new convToken;
233 if (!token) return NS_ERROR_OUT_OF_MEMORY;
234 token->prepend = true;
235 token->token.AssignLiteral("http://"); // XXX need to iterate through all protos
236 mTokens.AppendElement(token);
237
238 token = new convToken;
239 if (!token) return NS_ERROR_OUT_OF_MEMORY;
240 token->prepend = true;
241 token->token.Assign(char16_t('@'));
242 token->modText.AssignLiteral("mailto:");
243 mTokens.AppendElement(token);
244
245 return rv;
246 }
247
248 int32_t
249 nsTXTToHTMLConv::FindToken(int32_t cursor, convToken* *_retval)
250 {
251 int32_t loc = -1, firstToken = mBuffer.Length();
252 int8_t token = -1;
253 for (uint8_t i=0; i < mTokens.Length(); i++) {
254 loc = mBuffer.Find(mTokens[i]->token, cursor);
255 if (loc != -1)
256 if (loc < firstToken) {
257 firstToken = loc;
258 token = i;
259 }
260 }
261 if (token == -1)
262 return -1;
263
264 *_retval = mTokens[token];
265 return firstToken;
266 }
267
268 int32_t
269 nsTXTToHTMLConv::CatHTML(int32_t front, int32_t back)
270 {
271 int32_t cursor = 0;
272 int32_t modLen = mToken->modText.Length();
273 if (!mToken->prepend) {
274 // replace the entire token (from delimiter to delimiter)
275 mBuffer.Cut(front, back - front);
276 mBuffer.Insert(mToken->modText, front);
277 cursor = front+modLen;
278 } else {
279 nsString linkText;
280 // href is implied
281 mBuffer.Mid(linkText, front, back-front);
282
283 mBuffer.Insert(NS_LITERAL_STRING("<a href=\""), front);
284 cursor += front+9;
285 if (modLen) {
286 mBuffer.Insert(mToken->modText, cursor);
287 cursor += modLen;
288 }
289
290 NS_ConvertUTF16toUTF8 linkTextUTF8(linkText);
291 nsCString escaped;
292 if (NS_EscapeURL(linkTextUTF8.Data(), linkTextUTF8.Length(), esc_Minimal, escaped)) {
293 mBuffer.Cut(cursor, back - front);
294 CopyUTF8toUTF16(escaped, linkText);
295 mBuffer.Insert(linkText, cursor);
296 back = front + linkText.Length();
297 }
298
299 cursor += back-front;
300 mBuffer.Insert(NS_LITERAL_STRING("\">"), cursor);
301 cursor += 2;
302 mBuffer.Insert(linkText, cursor);
303 cursor += linkText.Length();
304 mBuffer.Insert(NS_LITERAL_STRING("</a>"), cursor);
305 cursor += 4;
306 }
307 mToken = nullptr; // indicates completeness
308 return cursor;
309 }

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