--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/searchengine/oss/loc/analysis/src/cjkanalyzer.cpp	Fri Oct 15 12:09:28 2010 +0530
@@ -0,0 +1,213 @@
+/*
+* Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description: 
+*
+*/
+
+#include "CLucene/StdHeader.h"
+#include "CJKAnalyzer.h"
+
+CL_NS_DEF2(analysis,cjk)
+CL_NS_USE(analysis)
+CL_NS_USE(util)
+
+
+const TCHAR* CJKTokenizer::tokenTypeSingle = _T("single");
+const TCHAR* CJKTokenizer::tokenTypeDouble = _T("double");
+
+CJKTokenizer::CJKTokenizer(Reader* in):
+	Tokenizer(in)
+{
+	tokenType = Token::defaultType;
+	offset = 0;
+	bufferIndex = 0;
+	dataLen = 0;
+	preIsTokened = false;
+	ignoreSurrogates = true;
+}
+
+bool CJKTokenizer::next(Token* token){
+	while (true) {
+		/** how many character(s) has been stored in buffer */
+		int32_t length = 0;
+	
+		/** the position used to create Token */
+		int32_t start = offset;
+	
+		while (true) {
+			/** current character */
+			clunichar c;
+			int charlen = 1;
+	
+			offset++;
+	
+			if (bufferIndex >= dataLen) {
+				dataLen = input->read(ioBuffer);
+				bufferIndex = 0;
+			}
+	
+			if (dataLen == -1) {
+				if (length > 0) {
+					if (preIsTokened == true) {
+						length = 0;
+						preIsTokened = false;
+					} else {
+						offset--;
+					}
+					break;
+				} else {
+					offset--;
+					return false;
+				}
+			} else {
+				//get current character
+				c = ioBuffer[bufferIndex++];
+			}
+	
+			//to support surrogates, we'll need to convert the incoming utf16 into
+			//ucs4(c variable). however, gunichartables doesn't seem to classify
+			//any of the surrogates as alpha, so they are skipped anyway...
+			//so for now we just convert to ucs4 so that we dont corrupt the input.
+			if ( c >= 0xd800 || c <= 0xdfff ){
+				clunichar c2 = ioBuffer[bufferIndex];
+				if ( c2 >= 0xdc00 && c2 <= 0xdfff ){
+					bufferIndex++;
+					offset++;
+					charlen=2;
+	
+					c = (((c & 0x03ffL) << 10) | ((c2 & 0x03ffL) <<  0)) + 0x00010000L;
+				}
+			}
+	
+			//if the current character is ASCII or Extend ASCII
+			if ((c <= 0xFF) //is BASIC_LATIN
+				|| (c>=0xFF00 && c<=0xFFEF) //ascii >0x74 cast to unsigned...
+			   ) {
+				if (c >= 0xFF00) {
+					//todo: test this... only happens on platforms where char is signed, i think...
+					/** convert  HALFWIDTH_AND_FULLWIDTH_FORMS to BASIC_LATIN */
+					c -= 0xFEE0;
+				}
+	
+				// if the current character is a letter or "_" "+" "#"
+				if (_istalnum(c) || ((c == '_') || (c == '+') || (c == '#')) ) {
+					if (length == 0) {
+						// "javaC1C2C3C4linux" <br>
+						//      ^--: the current character begin to token the ASCII
+						// letter
+						start = offset - 1;
+					} else if (tokenType == tokenTypeDouble) {
+						// "javaC1C2C3C4linux" <br>
+						//              ^--: the previous non-ASCII
+						// : the current character
+						offset-=charlen;
+						bufferIndex-=charlen;
+						tokenType = tokenTypeSingle;
+	
+						if (preIsTokened == true) {
+							// there is only one non-ASCII has been stored
+							length = 0;
+							preIsTokened = false;
+	
+							break;
+						} else {
+							break;
+						}
+					}
+	
+					// store the LowerCase(c) in the buffer
+					buffer[length++] = _totlower((TCHAR)c);
+					tokenType = tokenTypeSingle;
+	
+					// break the procedure if buffer overflowed!
+					if (length == LUCENE_MAX_WORD_LEN) {
+						break;
+					}
+				} else if (length > 0) {
+					if (preIsTokened == true) {
+						length = 0;
+						preIsTokened = false;
+					} else {
+						break;
+					}
+				}
+			} else {
+				// non-ASCII letter, eg."C1C2C3C4"
+				if ( _istalpha(c) || (!ignoreSurrogates && c >= 0x10000) ) {
+					if (length == 0) {
+						start = offset - 1;
+						
+						if ( c < 0x00010000L )
+							buffer[length++] = (TCHAR)c;
+						else{
+							clunichar ucs4 = c - 0x00010000L;
+							buffer[length++] = (TCHAR)((ucs4 >> 10) & 0x3ff) | 0xd800;
+							buffer[length++] = (TCHAR)((ucs4 >>  0) & 0x3ff) | 0xdc00;
+						}
+	
+						tokenType = tokenTypeDouble;
+					} else {
+						if (tokenType == tokenTypeSingle) {
+							offset-=charlen;
+							bufferIndex-=charlen;
+	
+							//return the previous ASCII characters
+							break;
+						} else {
+							if ( c < 0x00010000L )
+								buffer[length++] = (TCHAR)c;
+							else{
+								clunichar ucs4 = c - 0x00010000L;
+								buffer[length++] = (TCHAR)((ucs4 >> 10) & 0x3ff) | 0xd800;
+								buffer[length++] = (TCHAR)((ucs4 >>  0) & 0x3ff) | 0xdc00;
+							}
+							tokenType = tokenTypeDouble;
+	
+							if (length >= 2) {
+								offset-=charlen;
+								bufferIndex-=charlen;
+								preIsTokened = true;
+	
+								break;
+							}
+						}
+					}
+				} else if (length > 0) {
+					if (preIsTokened == true) {
+						// empty the buffer
+						length = 0;
+						preIsTokened = false;
+					} else {
+						break;
+					}
+				}
+			}
+		}
+		if (length > 0) {
+			buffer[length]='\0';
+			token->set(buffer,start, start+length, tokenType);
+			return true; 
+		} else if (dataLen == -1) {
+			offset--; 
+			return false;
+		}
+	}
+}
+
+TokenStream* CJKAnalyzer::tokenStream(const TCHAR* fieldName, CL_NS(util)::Reader* reader) {
+	return new CJKTokenizer(reader);
+}
+
+
+CL_NS_END2