Line data    Source code

       1             : // © 2016 and later: Unicode, Inc. and others.
       2             : // License & terms of use: http://www.unicode.org/copyright.html
       3             : /*
       4             :  **********************************************************************
       5             :  *   Copyright (C) 2005-2015, International Business Machines
       6             :  *   Corporation and others.  All Rights Reserved.
       7             :  **********************************************************************
       8             :  */
       9             : 
      10             : #ifndef __CSR2022_H
      11             : #define __CSR2022_H
      12             : 
      13             : #include "unicode/utypes.h"
      14             : 
      15             : #if !UCONFIG_NO_CONVERSION
      16             : 
      17             : #include "csrecog.h"
      18             : 
      19             : U_NAMESPACE_BEGIN
      20             : 
      21             : class CharsetMatch;
      22             : 
      23             : /**
      24             :  *  class CharsetRecog_2022  part of the ICU charset detection imlementation.
      25             :  *                           This is a superclass for the individual detectors for
      26             :  *                           each of the detectable members of the ISO 2022 family
      27             :  *                           of encodings.
      28             :  * 
      29             :  *                           The separate classes are nested within this class.
      30             :  * 
      31             :  * @internal
      32             :  */
      33           0 : class CharsetRecog_2022 : public CharsetRecognizer
      34             : {
      35             : 
      36             : public:    
      37             :     virtual ~CharsetRecog_2022() = 0;
      38             : 
      39             : protected:
      40             : 
      41             :     /**
      42             :      * Matching function shared among the 2022 detectors JP, CN and KR
      43             :      * Counts up the number of legal an unrecognized escape sequences in
      44             :      * the sample of text, and computes a score based on the total number &
      45             :      * the proportion that fit the encoding.
      46             :      * 
      47             :      * 
      48             :      * @param text the byte buffer containing text to analyse
      49             :      * @param textLen  the size of the text in the byte.
      50             :      * @param escapeSequences the byte escape sequences to test for.
      51             :      * @return match quality, in the range of 0-100.
      52             :      */
      53             :     int32_t match_2022(const uint8_t *text,
      54             :                        int32_t textLen,
      55             :                        const uint8_t escapeSequences[][5],
      56             :                        int32_t escapeSequences_length) const;
      57             : 
      58             : };
      59             : 
      60           0 : class CharsetRecog_2022JP :public CharsetRecog_2022
      61             : {
      62             : public:
      63             :     virtual ~CharsetRecog_2022JP();
      64             : 
      65             :     const char *getName() const;
      66             : 
      67             :     UBool match(InputText *textIn, CharsetMatch *results) const;
      68             : };
      69             : 
      70             : #if !UCONFIG_ONLY_HTML_CONVERSION
      71           0 : class CharsetRecog_2022KR :public CharsetRecog_2022 {
      72             : public:
      73             :     virtual ~CharsetRecog_2022KR();
      74             : 
      75             :     const char *getName() const;
      76             : 
      77             :     UBool match(InputText *textIn, CharsetMatch *results) const;
      78             : 
      79             : };
      80             : 
      81           0 : class CharsetRecog_2022CN :public CharsetRecog_2022
      82             : {
      83             : public:
      84             :     virtual ~CharsetRecog_2022CN();
      85             : 
      86             :     const char* getName() const;
      87             : 
      88             :     UBool match(InputText *textIn, CharsetMatch *results) const;
      89             : };
      90             : #endif
      91             : 
      92             : U_NAMESPACE_END
      93             : 
      94             : #endif
      95             : #endif /* __CSR2022_H */