utext.h

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/*
*******************************************************************************
*
*   Copyright (C) 2004-2007, International Business Machines
*   Corporation and others.  All Rights Reserved.
*
*******************************************************************************
*   file name:  utext.h
*   encoding:   US-ASCII
*   tab size:   8 (not used)
*   indentation:4
*
*   created on: 2004oct06
*   created by: Markus W. Scherer
*/

#ifndef __UTEXT_H__
#define __UTEXT_H__

#include "unicode/utypes.h"
#ifdef XP_CPLUSPLUS
#include "unicode/rep.h"
#include "unicode/unistr.h"
#include "unicode/chariter.h"
#endif


U_CDECL_BEGIN

struct UText;
typedef struct UText UText; 
/***************************************************************************************
 *
 *   C Functions for creating UText wrappers around various kinds of text strings.
 *
 ****************************************************************************************/


U_STABLE UText * U_EXPORT2
utext_close(UText *ut);


U_STABLE UText * U_EXPORT2
utext_openUTF8(UText *ut, const char *s, int64_t length, UErrorCode *status);


U_STABLE UText * U_EXPORT2
utext_openUChars(UText *ut, const UChar *s, int64_t length, UErrorCode *status);


#ifdef XP_CPLUSPLUS

U_STABLE UText * U_EXPORT2
utext_openUnicodeString(UText *ut, U_NAMESPACE_QUALIFIER UnicodeString *s, UErrorCode *status);


U_STABLE UText * U_EXPORT2
utext_openConstUnicodeString(UText *ut, const U_NAMESPACE_QUALIFIER UnicodeString *s, UErrorCode *status);


U_STABLE UText * U_EXPORT2
utext_openReplaceable(UText *ut, U_NAMESPACE_QUALIFIER Replaceable *rep, UErrorCode *status);

U_STABLE UText * U_EXPORT2
utext_openCharacterIterator(UText *ut, U_NAMESPACE_QUALIFIER CharacterIterator *ic, UErrorCode *status);

#endif


U_STABLE UText * U_EXPORT2
utext_clone(UText *dest, const UText *src, UBool deep, UBool readOnly, UErrorCode *status);


U_STABLE UBool U_EXPORT2
utext_equals(const UText *a, const UText *b);


/*****************************************************************************
 *
 *   Functions to work with the text represeted by a UText wrapper
 *
 *****************************************************************************/

U_STABLE int64_t U_EXPORT2
utext_nativeLength(UText *ut);

U_STABLE UBool U_EXPORT2
utext_isLengthExpensive(const UText *ut);

U_STABLE UChar32 U_EXPORT2
utext_char32At(UText *ut, int64_t nativeIndex);


U_STABLE UChar32 U_EXPORT2
utext_current32(UText *ut);


U_STABLE UChar32 U_EXPORT2
utext_next32(UText *ut);


U_STABLE UChar32 U_EXPORT2
utext_previous32(UText *ut);


U_STABLE UChar32 U_EXPORT2
utext_next32From(UText *ut, int64_t nativeIndex);



U_STABLE UChar32 U_EXPORT2
utext_previous32From(UText *ut, int64_t nativeIndex);

U_STABLE int64_t U_EXPORT2
utext_getNativeIndex(const UText *ut);

U_STABLE void U_EXPORT2
utext_setNativeIndex(UText *ut, int64_t nativeIndex);

U_STABLE UBool U_EXPORT2
utext_moveIndex32(UText *ut, int32_t delta);

U_STABLE int64_t U_EXPORT2
utext_getPreviousNativeIndex(UText *ut); 


U_STABLE int32_t U_EXPORT2
utext_extract(UText *ut,
             int64_t nativeStart, int64_t nativeLimit,
             UChar *dest, int32_t destCapacity,
             UErrorCode *status);


/************************************************************************************
 *
 *  #define inline versions of selected performance-critical text access functions
 *          Caution:  do not use auto increment++ or decrement-- expressions
 *                    as parameters to these macros.
 *
 *          For most use, where there is no extreme performance constraint, the
 *          normal, non-inline functions are a better choice.  The resulting code
 *          will be smaller, and, if the need ever arises, easier to debug.
 *
 *          These are implemented as #defines rather than real functions
 *          because there is no fully portable way to do inline functions in plain C.
 *
 ************************************************************************************/

#define UTEXT_NEXT32(ut)  \
    ((ut)->chunkOffset < (ut)->chunkLength && ((ut)->chunkContents)[(ut)->chunkOffset]<0xd800 ? \
    ((ut)->chunkContents)[((ut)->chunkOffset)++] : utext_next32(ut))

#define UTEXT_PREVIOUS32(ut)  \
    ((ut)->chunkOffset > 0 && \
     (ut)->chunkContents[(ut)->chunkOffset-1] < 0xd800 ? \
          (ut)->chunkContents[--((ut)->chunkOffset)]  :  utext_previous32(ut))

#define UTEXT_GETNATIVEINDEX(ut)                       \
    ((ut)->chunkOffset <= (ut)->nativeIndexingLimit?   \
        (ut)->chunkNativeStart+(ut)->chunkOffset :     \
        (ut)->pFuncs->mapOffsetToNative(ut))    

#define UTEXT_SETNATIVEINDEX(ut, ix)                       \
    { int64_t __offset = (ix) - (ut)->chunkNativeStart; \
      if (__offset>=0 && __offset<=(int64_t)(ut)->nativeIndexingLimit) { \
          (ut)->chunkOffset=(int32_t)__offset; \
      } else { \
          utext_setNativeIndex((ut), (ix)); } }



/************************************************************************************
 *
 *   Functions related to writing or modifying the text.
 *   These will work only with modifiable UTexts.  Attempting to
 *   modify a read-only UText will return an error status.
 *
 ************************************************************************************/


U_STABLE UBool U_EXPORT2
utext_isWritable(const UText *ut);


U_STABLE UBool U_EXPORT2
utext_hasMetaData(const UText *ut);


U_STABLE int32_t U_EXPORT2
utext_replace(UText *ut,
             int64_t nativeStart, int64_t nativeLimit,
             const UChar *replacementText, int32_t replacementLength,
             UErrorCode *status);



U_STABLE void U_EXPORT2
utext_copy(UText *ut,
          int64_t nativeStart, int64_t nativeLimit,
          int64_t destIndex,
          UBool move,
          UErrorCode *status);


U_STABLE void U_EXPORT2
utext_freeze(UText *ut);


enum {
    UTEXT_PROVIDER_LENGTH_IS_EXPENSIVE = 1,
    UTEXT_PROVIDER_STABLE_CHUNKS = 2,
    UTEXT_PROVIDER_WRITABLE = 3,
    UTEXT_PROVIDER_HAS_META_DATA = 4,
     UTEXT_PROVIDER_OWNS_TEXT = 5
};

typedef UText * U_CALLCONV
UTextClone(UText *dest, const UText *src, UBool deep, UErrorCode *status);


typedef int64_t U_CALLCONV
UTextNativeLength(UText *ut);

typedef UBool U_CALLCONV
UTextAccess(UText *ut, int64_t nativeIndex, UBool forward);

typedef int32_t U_CALLCONV
UTextExtract(UText *ut,
             int64_t nativeStart, int64_t nativeLimit,
             UChar *dest, int32_t destCapacity,
             UErrorCode *status);

typedef int32_t U_CALLCONV
UTextReplace(UText *ut,
             int64_t nativeStart, int64_t nativeLimit,
             const UChar *replacementText, int32_t replacmentLength,
             UErrorCode *status);

typedef void U_CALLCONV
UTextCopy(UText *ut,
          int64_t nativeStart, int64_t nativeLimit,
          int64_t nativeDest,
          UBool move,
          UErrorCode *status);

typedef int64_t U_CALLCONV
UTextMapOffsetToNative(const UText *ut);

typedef int32_t U_CALLCONV
UTextMapNativeIndexToUTF16(const UText *ut, int64_t nativeIndex);


typedef void U_CALLCONV
UTextClose(UText *ut);


struct UTextFuncs {
    int32_t       tableSize;

    int32_t       reserved1, reserved2, reserved3;


    UTextClone *clone;

    UTextNativeLength *nativeLength;

    UTextAccess *access;

    UTextExtract *extract;

    UTextReplace *replace;

    UTextCopy *copy;

    UTextMapOffsetToNative *mapOffsetToNative;

    UTextMapNativeIndexToUTF16 *mapNativeIndexToUTF16;

    UTextClose  *close;

    UTextClose  *spare1;
    UTextClose  *spare2;

    UTextClose  *spare3;

};
typedef struct UTextFuncs UTextFuncs;

struct UText {
    uint32_t       magic;


    int32_t        flags;


    int32_t         providerProperties;

    int32_t         sizeOfStruct;
    
    /* ------ 16 byte alignment boundary -----------  */
    

    int64_t         chunkNativeLimit;

    int32_t        extraSize;

    int32_t         nativeIndexingLimit;

    /* ---- 16 byte alignment boundary------ */
    
    int64_t         chunkNativeStart;

    int32_t         chunkOffset;

    int32_t         chunkLength;

    /* ---- 16  byte alignment boundary-- */
    

    const UChar    *chunkContents;

    UTextFuncs     *pFuncs;
    
    void          *pExtra;

    const void   *context;

    /* --- 16 byte alignment boundary--- */

    const void     *p; 
    const void     *q;
    const void     *r;

    void           *privP;


    /* --- 16 byte alignment boundary--- */
    

    int64_t         a;

    int32_t         b;

    int32_t         c;

    /*  ---- 16 byte alignment boundary---- */


    int64_t         privA;
    int32_t         privB;
    int32_t         privC;
};


U_STABLE UText * U_EXPORT2
utext_setup(UText *ut, int32_t extraSpace, UErrorCode *status);

enum {
    UTEXT_MAGIC = 0x345ad82c
};

#define UTEXT_INITIALIZER {                                        \
                  UTEXT_MAGIC,          /* magic                */ \
                  0,                    /* flags                */ \
                  0,                    /* providerProps        */ \
                  sizeof(UText),        /* sizeOfStruct         */ \
                  0,                    /* chunkNativeLimit     */ \
                  0,                    /* extraSize            */ \
                  0,                    /* nativeIndexingLimit  */ \
                  0,                    /* chunkNativeStart     */ \
                  0,                    /* chunkOffset          */ \
                  0,                    /* chunkLength          */ \
                  NULL,                 /* chunkContents        */ \
                  NULL,                 /* pFuncs               */ \
                  NULL,                 /* pExtra               */ \
                  NULL,                 /* context              */ \
                  NULL, NULL, NULL,     /* p, q, r              */ \
                  NULL,                 /* privP                */ \
                  0, 0, 0,              /* a, b, c              */ \
                  0, 0, 0               /* privA,B,C,           */ \
                  }


U_CDECL_END



#endif

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