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/* (C) Copyright 2005, 2006, 2007, 2008, 2009 Stijn van Dongen
*
* This file is part of tingea. You can redistribute and/or modify tingea under
* the terms of the GNU General Public License; either version 3 of the License
* or (at your option) any later version. You should have received a copy of
* the GPL along with tingea, in the file COPYING.
*/
#ifndef tingea_tr
#define tingea_tr
#include <string.h>
#include "ting.h"
#include "types.h"
#include "inttypes.h"
/*
* README
* This interface is not POSIX compliant. It might evolve to
* optionally be indeed.
* However, given some of the braindeadliness of POSIX tr compliance,
* I don't think the worlds needs another tr implementation.
* My gripe is mainly about derailed syntax such as '[:alpha:0'.
* It should go down in a ball of flames, not happily parse.
* To be honest, I don't know for sure whether this is a POSIX
* lack of requirement or an implementation choice.
*
* I did choose to follow most of the POSIX syntax. It is probably
* a sign of weakness.
* This interface should be able to do everything a POSIX interface can,
* possibly more.
*
* - It allows separate specification of src, dst, del and squash sets.
* - Provisionally we accept "^spec" to indicate complement,
* for any of src dst del squash sets.
* - It uses [*c*20] to denote repeats, rather than [c*20].
* rationale: do not slam door shut on new syntax.
* - It does not recognize '[a-z]' ranges, only 'a-z'.
* rationale: none. If ever, notation will be [-a-z] or similar.
* - The magic repeat operator [*c#] stops on boundaries
* rationale: I like it.
* A boundary is introduced by stop/start of ranges and classes.
* - The magic repeat operator [*c*] does not stop on boundaries.
* - For now, the interface does 1) deletion, 2) translation, 3) squashing.
* in the future it may provide a custom order of doing things.
*
*
* Apart from the fact that you cannot have '\0' in C strings, everything
* here should work for '\0' as well - specifically the mcxTrTable structure.
* However, the current interface uses C strings for dst and src and C strings
* for data.
*
* More documentation to follow.
*
*/
extern const char* mcx_tr_err;
extern mcxbool mcx_tr_debug;
typedef struct
{ u32 tlt[256]
; mcxbits modes
;
} mcxTR ;
#define MCX_TR_DEFAULT 0
#define MCX_TR_TRANSLATE 1 << 1
#define MCX_TR_SOURCE 1 << 2
#define MCX_TR_DEST 1 << 3
#define MCX_TR_SQUASH 1 << 4
#define MCX_TR_DELETE 1 << 5
#define MCX_TR_SOURCE_C 1 << 6
#define MCX_TR_DEST_C 1 << 7
#define MCX_TR_DELETE_C 1 << 8
#define MCX_TR_SQUASH_C 1 << 9
#define MCX_TR_COMPLEMENT 1 << 10
mcxstatus mcxTRloadTable
( mcxTR* tr
, const char* src
, const char* dst
, const char* set_delete
, const char* set_squash
, mcxbits modes
) ;
/* returns new length of string.
* fixme: document map/squash semantics.
*/
ofs mcxTRtranslate
( char* src
, mcxTR* tr
) ;
ofs mcxTingTranslate
( mcxTing* src
, mcxTR* tr
) ;
ofs mcxTingTr
( mcxTing* txt
, const char* src
, const char* dst
, const char* set_delete
, const char* set_squash
, mcxbits flags
) ;
/* Accepts e.g. \012 and sets *value to 10.
* idem \xa0 and \n (\t, \r, \b etc)
* Does *not* yet accept \0xa0
*
* Returns next parsable character.
*
* This interface should be moved to ding.
*/
char* mcxStrEscapedValue
( const char* p
, const char* z
, int *value
) ;
/*
* returns a ting containing all the characters according to bits.
* bits accept
* MCX_TR_SOURCE
* MCX_TR_SOURCE_C
* MCX_TR_SQUASH
* MCX_TR_SQUASH_C
* MCX_TR_DELETE
* MCX_TR_DELETE_C
*
* NOTE
* MCX_TR_DEST
* MCX_TR_DEST_C
* are not yet implemented.
*
* NOTE DANGER SIGN
* tr no longer contains information on complements that were
* used in constructing it.
* The complements that bits refer to is simply the information
* present in tr.
* So a source of "^a-z" given to mcxTRloadTable
* and MCX_TR_SOURCE_C given to mcxTRsplash
* result in a string containing all of a-z.
*/
mcxTing* mcxTRsplash
( mcxTR* tr
, mcxbits bits
) ;
#endif
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