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2a4d8d890e
Now the UTF-8 prober would not only detect valid UTF-8, but would also
detect the most probable language. Using the data generated 2 commits
away, this works very well.
This is still basic and will require even more improvements. In
particular, now the nsUTF8Prober should return an array of ("UTF-8",
language) couple candidate. And nsMBCSGroupProber should itself forward
these candidates as well as other candidates from other multi-byte
detectors. This way, the public-facing API would get more probable
candidates, in case the algorithm is slightly wrong.
Also the UTF-8 confidence is currently stupidly high as soon as we
consider it to be right. We should likely weigh it with language
detection (in particular, if no language is detected, this should
severely weigh down UTF-8 detection; not to 0, but high enough to be a
fallback in case no other encoding+lang is valid and low enough to give
chances to other good candidate couples.
94 lines
3.3 KiB
C++
94 lines
3.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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 Communicator client 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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#ifndef nsUniversalDetector_h__
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#define nsUniversalDetector_h__
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class nsCharSetProber;
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#define NUM_OF_CHARSET_PROBERS 3
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typedef enum {
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ePureAscii = 0,
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eEscAscii = 1,
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eHighbyte = 2
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} nsInputState;
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#define NS_FILTER_CHINESE_SIMPLIFIED 0x01
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#define NS_FILTER_CHINESE_TRADITIONAL 0x02
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#define NS_FILTER_JAPANESE 0x04
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#define NS_FILTER_KOREAN 0x08
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#define NS_FILTER_NON_CJK 0x10
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#define NS_FILTER_ALL 0x1F
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#define NS_FILTER_CHINESE (NS_FILTER_CHINESE_SIMPLIFIED | \
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NS_FILTER_CHINESE_TRADITIONAL)
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#define NS_FILTER_CJK (NS_FILTER_CHINESE_SIMPLIFIED | \
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NS_FILTER_CHINESE_TRADITIONAL | \
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NS_FILTER_JAPANESE | \
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NS_FILTER_KOREAN)
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class nsUniversalDetector {
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public:
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nsUniversalDetector(PRUint32 aLanguageFilter);
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virtual ~nsUniversalDetector();
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virtual nsresult HandleData(const char* aBuf, PRUint32 aLen);
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virtual void DataEnd(void);
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protected:
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virtual void Report(const char *encoding,
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const char *language,
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float confidence) = 0;
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virtual void Reset();
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nsInputState mInputState;
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PRBool mNbspFound;
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PRBool mDone;
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PRBool mInTag;
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PRBool mStart;
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PRBool mGotData;
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char mLastChar;
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const char * mDetectedCharset;
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const char * mDetectedLanguage;
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float mDetectedConfidence;
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PRInt32 mBestGuess;
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PRUint32 mLanguageFilter;
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nsCharSetProber *mCharSetProbers[NUM_OF_CHARSET_PROBERS];
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nsCharSetProber *mEscCharSetProber;
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};
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#endif
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