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/*
* $Id: thinp.h,v 1.9 2006-07-31 11:07:46 thep Exp $
* thinp.h - Thai string input sequence filtering
* Created: 2001-05-17
*/
#ifndef THAI_THINP_H
#define THAI_THINP_H
#include <thai/thailib.h>
#include <thai/thcell.h>
BEGIN_CDECL
/**
* @file thinp.h
* @brief Thai string input sequence filtering
*/
/**
* @brief Strictness of input sequence checking, according to WTT 2.0
*/
typedef enum {
ISC_PASSTHROUGH = 0, /**< No check */
ISC_BASICCHECK = 1, /**< Basic check */
ISC_STRICT = 2 /**< Strict check */
} thstrict_t;
/**
* @brief Check for acceptance of input sequence
*
* @param c1 : previous character
* @param c2 : the newly input character
* @param s : strictness level
*
* @return non-zero if accepted, 0 otherwise
*
* Checks if, according to WTT 2.0 strictness level @a s, @a c2 is allowed
* after @a c1.
*/
extern int th_isaccept(thchar_t c1, thchar_t c2, thstrict_t s);
/**
* @brief Input sequence correction info
*/
struct thinpconv_t {
thchar_t conv[4]; /**< (null-terminated) string to put into input buffer */
int offset; /**< offset (<=0) from cur pos where the conv begin */
};
/**
* @brief Check and try to correct input sequence
*
* @param context : previous cell
* @param c : the newly input character
* @param conv : the storage for resulting correction info
*
* @returns 0 if the input is to be rejected
* non-zero otherwise.
*
* Given the previous cell as @a context, edit the input buffer using
* the given input @a c, maintaining WTT canonical order, and do some
* convenient correction in @a conv.
*/
extern int th_validate(struct thcell_t context, thchar_t c,
struct thinpconv_t *conv);
END_CDECL
#endif /* THAI_THINP_H */
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