125 lines
4.3 KiB
C++
125 lines
4.3 KiB
C++
/* -*- Mode: C; tab-width: 4; 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 Universal charset detector 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) 2001
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Shy Shalom <shooshX@gmail.com>
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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 "nsCharSetProber.h"
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#include "prmem.h"
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//This filter applies to all scripts which do not use English characters
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PRBool nsCharSetProber::FilterWithoutEnglishLetters(const char* aBuf, PRUint32 aLen, char** newBuf, PRUint32& newLen)
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{
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char *newptr;
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char *prevPtr, *curPtr;
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PRBool meetMSB = PR_FALSE;
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newptr = *newBuf = (char*)PR_Malloc(aLen);
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if (!newptr)
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return PR_FALSE;
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for (curPtr = prevPtr = (char*)aBuf; curPtr < aBuf+aLen; curPtr++)
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{
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if (*curPtr & 0x80)
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{
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meetMSB = PR_TRUE;
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}
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else if (*curPtr < 'A' || (*curPtr > 'Z' && *curPtr < 'a') || *curPtr > 'z')
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{
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//current char is a symbol, most likely a punctuation. we treat it as segment delimiter
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if (meetMSB && curPtr > prevPtr)
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//this segment contains more than single symbol, and it has upper ASCII, we need to keep it
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{
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while (prevPtr < curPtr) *newptr++ = *prevPtr++;
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prevPtr++;
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*newptr++ = ' ';
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meetMSB = PR_FALSE;
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}
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else //ignore current segment. (either because it is just a symbol or just an English word)
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prevPtr = curPtr+1;
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}
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}
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if (meetMSB && curPtr > prevPtr)
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while (prevPtr < curPtr) *newptr++ = *prevPtr++;
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newLen = newptr - *newBuf;
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return PR_TRUE;
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}
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//This filter applies to all scripts which contain both English characters and upper ASCII characters.
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PRBool nsCharSetProber::FilterWithEnglishLetters(const char* aBuf, PRUint32 aLen, char** newBuf, PRUint32& newLen)
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{
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//do filtering to reduce load to probers
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char *newptr;
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char *prevPtr, *curPtr;
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PRBool isInTag = PR_FALSE;
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newptr = *newBuf = (char*)PR_Malloc(aLen);
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if (!newptr)
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return PR_FALSE;
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for (curPtr = prevPtr = (char*)aBuf; curPtr < aBuf+aLen; curPtr++)
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{
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if (*curPtr == '>')
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isInTag = PR_FALSE;
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else if (*curPtr == '<')
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isInTag = PR_TRUE;
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if (!(*curPtr & 0x80) &&
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(*curPtr < 'A' || (*curPtr > 'Z' && *curPtr < 'a') || *curPtr > 'z') )
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{
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if (curPtr > prevPtr && !isInTag) // Current segment contains more than just a symbol
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// and it is not inside a tag, keep it.
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{
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while (prevPtr < curPtr) *newptr++ = *prevPtr++;
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prevPtr++;
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*newptr++ = ' ';
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}
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else
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prevPtr = curPtr+1;
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}
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}
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// If the current segment contains more than just a symbol
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// and it is not inside a tag then keep it.
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if (!isInTag)
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while (prevPtr < curPtr)
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*newptr++ = *prevPtr++;
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newLen = newptr - *newBuf;
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return PR_TRUE;
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}
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