src/farsi.c

/* vi:set ts=8 sts=4 sw=4:
 *
 * VIM - Vi IMproved	by Bram Moolenaar
 *
 * Do ":help uganda"  in Vim to read copying and usage conditions.
 * Do ":help credits" in Vim to see a list of people who contributed.
 * See README.txt for an overview of the Vim source code.
 */

/*
 * farsi.c: functions for Farsi language
 *
 * Included by main.c, when FEAT_FKMAP is defined.
 */

static int toF_Xor_X_(int c);
static int F_is_TyE(int c);
static int F_is_TyC_TyD(int c);
static int F_is_TyB_TyC_TyD(int src, int offset);
static int toF_TyB(int c);
static void put_curr_and_l_to_X(int c);
static void put_and_redo(int c);
static void chg_c_toX_orX(void);
static void chg_c_to_X_orX_(void);
static void chg_c_to_X_or_X(void);
static void chg_l_to_X_orX_(void);
static void chg_l_toXor_X(void);
static void chg_r_to_Xor_X_(void);
static int toF_leading(int c);
static int toF_Rjoin(int c);
static int canF_Ljoin(int c);
static int canF_Rjoin(int c);
static int F_isterm(int c);
static int toF_ending(int c);
static void lrswapbuf(char_u *buf, int len);

/*
 * Convert the given Farsi character into a _X or _X_ type
*/
    static int
toF_Xor_X_(int c)
{
    int tempc;

    switch (c)
    {
	case BE: return _BE;
	case PE: return _PE;
	case TE: return _TE;
	case SE: return _SE;
	case JIM: return _JIM;
	case CHE: return _CHE;
	case HE_J: return _HE_J;
	case XE: return _XE;
	case SIN: return _SIN;
	case SHIN: return _SHIN;
	case SAD: return _SAD;
	case ZAD: return _ZAD;
	case AYN: return _AYN;
	case AYN_: return _AYN_;
	case GHAYN: return _GHAYN;
	case GHAYN_: return _GHAYN_;
	case FE: return _FE;
	case GHAF: return _GHAF;
	case KAF: return _KAF;
	case GAF: return _GAF;
	case LAM: return _LAM;
	case MIM: return _MIM;
	case NOON: return _NOON;
	case YE:
	case YE_: return _YE;
	case YEE:
	case YEE_: return _YEE;
	case IE:
	case IE_: return _IE;
	case F_HE:
		tempc = _HE;

		if (p_ri && (curwin->w_cursor.col + 1
					 < (colnr_T)STRLEN(ml_get_curline())))
		{
		    inc_cursor();

		    if (F_is_TyB_TyC_TyD(SRC_EDT, AT_CURSOR))
			tempc = _HE_;

		    dec_cursor();
		}
		if (!p_ri && STRLEN(ml_get_curline()))
		{
		    dec_cursor();

		    if (F_is_TyB_TyC_TyD(SRC_EDT, AT_CURSOR))
			tempc = _HE_;

		    inc_cursor();
		}

		return tempc;
    }
    return 0;
}

/*
 * Convert the given Farsi character into Farsi capital character.
*/
    static int
toF_TyA(int c)
{
    switch (c)
    {
	case ALEF_: return ALEF;
	case ALEF_U_H_: return ALEF_U_H;
	case _BE: return BE;
	case _PE: return PE;
	case _TE: return TE;
	case _SE: return SE;
	case _JIM: return JIM;
	case _CHE: return CHE;
	case _HE_J: return HE_J;
	case _XE: return XE;
	case _SIN: return SIN;
	case _SHIN: return SHIN;
	case _SAD: return SAD;
	case _ZAD: return ZAD;
	case _AYN:
	case AYN_:
	case _AYN_: return AYN;
	case _GHAYN:
	case GHAYN_:
	case _GHAYN_: return GHAYN;
	case _FE: return FE;
	case _GHAF: return GHAF;
	/* I am not sure what it is !!!	    case _KAF_H: */
	case _KAF: return KAF;
	case _GAF: return GAF;
	case _LAM: return LAM;
	case _MIM: return MIM;
	case _NOON: return NOON;
	case _YE:
	case YE_: return YE;
	case _YEE:
	case YEE_: return YEE;
	case TEE_: return TEE;
	case _IE:
	case IE_: return IE;
	case _HE:
	case _HE_: return F_HE;
    }
    return c;
}

/*
 * Is the character under the cursor+offset in the given buffer a join type.
 * That is a character that is combined with the others.
 * Note: the offset is used only for command line buffer.
*/
    static int
F_is_TyB_TyC_TyD(int src, int offset)
{
    int		c;

    if (src == SRC_EDT)
	c = gchar_cursor();
    else
	c = cmd_gchar(AT_CURSOR+offset);

    switch (c)
    {
	case _LAM:
	case _BE:
	case _PE:
	case _TE:
	case _SE:
	case _JIM:
	case _CHE:
	case _HE_J:
	case _XE:
	case _SIN:
	case _SHIN:
	case _SAD:
	case _ZAD:
	case _TA:
	case _ZA:
	case _AYN:
	case _AYN_:
	case _GHAYN:
	case _GHAYN_:
	case _FE:
	case _GHAF:
	case _KAF:
	case _KAF_H:
	case _GAF:
	case _MIM:
	case _NOON:
	case _YE:
	case _YEE:
	case _IE:
	case _HE_:
	case _HE:
		return TRUE;
    }
    return FALSE;
}

/*
 * Is the Farsi character one of the terminating only type.
*/
    static int
F_is_TyE(int c)
{
    switch (c)
    {
	case ALEF_A:
	case ALEF_D_H:
	case DAL:
	case ZAL:
	case RE:
	case ZE:
	case JE:
	case WAW:
	case WAW_H:
	case HAMZE:
		return TRUE;
    }
    return FALSE;
}

/*
 * Is the Farsi character one of the none leading type.
*/
    static int
F_is_TyC_TyD(int c)
{
    switch (c)
    {
	case ALEF_:
	case ALEF_U_H_:
	case _AYN_:
	case AYN_:
	case _GHAYN_:
	case GHAYN_:
	case _HE_:
	case YE_:
	case IE_:
	case TEE_:
	case YEE_:
		return TRUE;
    }
    return FALSE;
}

/*
 * Convert a none leading Farsi char into a leading type.
*/
    static int
toF_TyB(int c)
{
    switch (c)
    {
	case ALEF_:	return ALEF;
	case ALEF_U_H_:	return ALEF_U_H;
	case _AYN_:	return _AYN;
	case AYN_:	return AYN;	/* exception - there are many of them */
	case _GHAYN_:	return _GHAYN;
	case GHAYN_:	return GHAYN;	/* exception - there are many of them */
	case _HE_:	return _HE;
	case YE_:	return YE;
	case IE_:	return IE;
	case TEE_:	return TEE;
	case YEE_:	return YEE;
    }
    return c;
}

/*
 * Overwrite the current redo and cursor characters + left adjust.
*/
    static void
put_curr_and_l_to_X(int c)
{
    int	tempc;

    if (curwin->w_p_rl && p_ri)
	return;

    if ((curwin->w_cursor.col < (colnr_T)STRLEN(ml_get_curline())))
    {
	if ((p_ri && curwin->w_cursor.col) || !p_ri)
	{
	    if (p_ri)
		dec_cursor();
	    else
		inc_cursor();

	    if (F_is_TyC_TyD((tempc = gchar_cursor())))
	    {
		pchar_cursor(toF_TyB(tempc));
		AppendCharToRedobuff(K_BS);
		AppendCharToRedobuff(tempc);
	    }

	    if (p_ri)
		inc_cursor();
	    else
		dec_cursor();
	}
    }

    put_and_redo(c);
}

    static void
put_and_redo(int c)
{
    pchar_cursor(c);
    AppendCharToRedobuff(K_BS);
    AppendCharToRedobuff(c);
}

/*
 * Change the char. under the cursor to a X_ or X type
*/
    static void
chg_c_toX_orX(void)
{
    int	tempc, curc;

    switch ((curc = gchar_cursor()))
    {
	case _BE:
		tempc = BE;
		break;
	case _PE:
		tempc = PE;
		break;
	case _TE:
		tempc = TE;
		break;
	case _SE:
		tempc = SE;
		break;
	case _JIM:
		tempc = JIM;
		break;
	case _CHE:
		tempc = CHE;
		break;
	case _HE_J:
		tempc = HE_J;
		break;
	case _XE:
		tempc = XE;
		break;
	case _SIN:
		tempc = SIN;
		break;
	case _SHIN:
		tempc = SHIN;
		break;
	case _SAD:
		tempc = SAD;
		break;
	case _ZAD:
		tempc = ZAD;
		break;
	case _FE:
		tempc = FE;
		break;
	case _GHAF:
		tempc = GHAF;
		break;
	case _KAF_H:
	case _KAF:
		tempc = KAF;
		break;
	case _GAF:
		tempc = GAF;
		break;
	case _AYN:
		tempc = AYN;
		break;
	case _AYN_:
		tempc = AYN_;
		break;
	case _GHAYN:
		tempc = GHAYN;
		break;
	case _GHAYN_:
		tempc = GHAYN_;
		break;
	case _LAM:
		tempc = LAM;
		break;
	case _MIM:
		tempc = MIM;
		break;
	case _NOON:
		tempc = NOON;
		break;
	case _HE:
	case _HE_:
		tempc = F_HE;
		break;
	case _YE:
	case _IE:
	case _YEE:
		if (p_ri)
		{
		    inc_cursor();
		    if (F_is_TyB_TyC_TyD(SRC_EDT, AT_CURSOR))
			    tempc = (curc == _YE ? YE_ :
			    (curc == _IE ? IE_ : YEE_));
		    else
			    tempc = (curc == _YE ? YE :
			    (curc == _IE ? IE : YEE));
		    dec_cursor();
		}
		else
		{
		    if (curwin->w_cursor.col)
		    {
			dec_cursor();
			if (F_is_TyB_TyC_TyD(SRC_EDT, AT_CURSOR))
				tempc = (curc == _YE ? YE_ :
				(curc == _IE ? IE_ : YEE_));
			else
				tempc = (curc == _YE ? YE :
				(curc == _IE ? IE : YEE));
			inc_cursor();
		    }
		    else
			    tempc = (curc == _YE ? YE :
			    (curc == _IE ? IE : YEE));
		}
		break;
	default:
		tempc = 0;
    }

    if (tempc)
	put_and_redo(tempc);
}

/*
 * Change the char. under the cursor to a _X_ or X_ type
*/

    static void
chg_c_to_X_orX_(void)
{
    int	tempc;

    switch (gchar_cursor())
    {
	case ALEF:
		tempc = ALEF_;
		break;
	case ALEF_U_H:
		tempc = ALEF_U_H_;
		break;
	case _AYN:
		tempc = _AYN_;
		break;
	case AYN:
		tempc = AYN_;
		break;
	case _GHAYN:
		tempc = _GHAYN_;
		break;
	case GHAYN:
		tempc = GHAYN_;
		break;
	case _HE:
		tempc = _HE_;
		break;
	case YE:
		tempc = YE_;
		break;
	case IE:
		tempc = IE_;
		break;
	case TEE:
		tempc = TEE_;
		break;
	case YEE:
		tempc = YEE_;
		break;
	default:
		tempc = 0;
    }

    if (tempc)
	put_and_redo(tempc);
}

/*
 * Change the char. under the cursor to a _X_ or _X type
*/
    static void
chg_c_to_X_or_X (void)
{
    int	tempc;

    tempc = gchar_cursor();

    if (curwin->w_cursor.col + 1 < (colnr_T)STRLEN(ml_get_curline()))
    {
	inc_cursor();

	if ((tempc == F_HE) && (F_is_TyB_TyC_TyD(SRC_EDT, AT_CURSOR)))
	{
	    tempc = _HE_;

	    dec_cursor();

	    put_and_redo(tempc);
	    return;
	}

	dec_cursor();
    }

    if ((tempc = toF_Xor_X_(tempc)) != 0)
	put_and_redo(tempc);
}

/*
 * Change the character left to the cursor to a _X_ or X_ type
*/
    static void
chg_l_to_X_orX_(void)
{
    int	tempc;

    if (curwin->w_cursor.col != 0 &&
	(curwin->w_cursor.col + 1 == (colnr_T)STRLEN(ml_get_curline())))
	return;

    if (!curwin->w_cursor.col && p_ri)
	return;

    if (p_ri)
	dec_cursor();
    else
	inc_cursor();

    switch (gchar_cursor())
    {
	case ALEF:
		tempc = ALEF_;
		break;
	case ALEF_U_H:
		tempc = ALEF_U_H_;
		break;
	case _AYN:
		tempc = _AYN_;
		break;
	case AYN:
		tempc = AYN_;
		break;
	case _GHAYN:
		tempc = _GHAYN_;
		break;
	case GHAYN:
		tempc = GHAYN_;
		break;
	case _HE:
		tempc = _HE_;
		break;
	case YE:
		tempc = YE_;
		break;
	case IE:
		tempc = IE_;
		break;
	case TEE:
		tempc = TEE_;
		break;
	case YEE:
		tempc = YEE_;
		break;
	default:
		tempc = 0;
    }

    if (tempc)
	put_and_redo(tempc);

    if (p_ri)
	inc_cursor();
    else
	dec_cursor();
}

/*
 * Change the character left to the cursor to a X or _X type
*/

    static void
chg_l_toXor_X (void)
{
    int	tempc;

    if (curwin->w_cursor.col != 0 &&
	(curwin->w_cursor.col + 1 == (colnr_T)STRLEN(ml_get_curline())))
	return;

    if (!curwin->w_cursor.col && p_ri)
	return;

    if (p_ri)
	dec_cursor();
    else
	inc_cursor();

    switch (gchar_cursor())
    {
	case ALEF_:
		tempc = ALEF;
		break;
	case ALEF_U_H_:
		tempc = ALEF_U_H;
		break;
	case _AYN_:
		tempc = _AYN;
		break;
	case AYN_:
		tempc = AYN;
		break;
	case _GHAYN_:
		tempc = _GHAYN;
		break;
	case GHAYN_:
		tempc = GHAYN;
		break;
	case _HE_:
		tempc = _HE;
		break;
	case YE_:
		tempc = YE;
		break;
	case IE_:
		tempc = IE;
		break;
	case TEE_:
		tempc = TEE;
		break;
	case YEE_:
		tempc = YEE;
		break;
	default:
		tempc = 0;
    }

    if (tempc)
	put_and_redo(tempc);

    if (p_ri)
	inc_cursor();
    else
	dec_cursor();
}

/*
 * Change the character right to the cursor to a _X or _X_ type
*/

    static void
chg_r_to_Xor_X_(void)
{
    int tempc, c;

    if (curwin->w_cursor.col)
    {
	if (!p_ri)
	    dec_cursor();

	tempc = gchar_cursor();

	if ((c = toF_Xor_X_(tempc)) != 0)
	    put_and_redo(c);

	if (!p_ri)
	    inc_cursor();

    }
}

/*
 * Map Farsi keyboard when in fkmap mode.
*/

    int
fkmap(int c)
{
    int		tempc;
    static int	revins;

    if (IS_SPECIAL(c))
	return c;

    if (VIM_ISDIGIT(c) || ((c == '.' || c == '+' || c == '-' ||
	c == '^' || c == '%' || c == '#' || c == '=')  && revins))
    {
	if (!revins)
	{
	    if (curwin->w_cursor.col)
	    {
		if (!p_ri)
		    dec_cursor();

		chg_c_toX_orX ();
		chg_l_toXor_X ();

		if (!p_ri)
		    inc_cursor();
	    }
	}

	arrow_used = TRUE;
	(void)stop_arrow();

	if (!curwin->w_p_rl && revins)
	    inc_cursor();

	++revins;
	p_ri=1;
    }
    else
    {
	if (revins)
	{
	    arrow_used = TRUE;
	    (void)stop_arrow();

	    revins = 0;
	    if (curwin->w_p_rl)
	    {
		while ((F_isdigit(gchar_cursor())
			    || (gchar_cursor() == F_PERIOD
				|| gchar_cursor() == F_PLUS
				|| gchar_cursor() == F_MINUS
				|| gchar_cursor() == F_MUL
				|| gchar_cursor() == F_DIVIDE
				|| gchar_cursor() == F_PERCENT
				|| gchar_cursor() == F_EQUALS))
			&& gchar_cursor() != NUL)
		    ++curwin->w_cursor.col;
	    }
	    else
	    {
		if (curwin->w_cursor.col)
		    while ((F_isdigit(gchar_cursor())
			    || (gchar_cursor() == F_PERIOD
				|| gchar_cursor() == F_PLUS
				|| gchar_cursor() == F_MINUS
				|| gchar_cursor() == F_MUL
				|| gchar_cursor() == F_DIVIDE
				|| gchar_cursor() == F_PERCENT
				|| gchar_cursor() == F_EQUALS))
			    && --curwin->w_cursor.col)
			;

		if (!F_isdigit(gchar_cursor()))
		    ++curwin->w_cursor.col;
	    }
	}
    }

    if (!revins)
    {
	if (curwin->w_p_rl)
	    p_ri=0;
	if (!curwin->w_p_rl)
	    p_ri=1;
    }

    if ((c < 0x100) && (isalpha(c) || c == '&' ||   c == '^' ||	c == ';' ||
			    c == '\''||	c == ',' || c == '[' ||
			    c == ']' ||	c == '{' || c == '}'	))
	chg_r_to_Xor_X_();

    tempc = 0;

    switch (c)
    {
	case '`':
	case ' ':
	case '.':
	case '!':
	case '"':
	case '$':
	case '%':
	case '^':
	case '&':
	case '/':
	case '(':
	case ')':
	case '=':
	case '\\':
	case '?':
	case '+':
	case '-':
	case '_':
	case '*':
	case ':':
	case '#':
	case '~':
	case '@':
	case '<':
	case '>':
	case '{':
	case '}':
	case '|':
	case '0':
	case '1':
	case '2':
	case '3':
	case '4':
	case '5':
	case '6':
	case '7':
	case '8':
	case '9':
	case 'B':
	case 'E':
	case 'F':
	case 'H':
	case 'I':
	case 'K':
	case 'L':
	case 'M':
	case 'O':
	case 'P':
	case 'Q':
	case 'R':
	case 'T':
	case 'U':
	case 'W':
	case 'Y':
	case  NL:
	case  TAB:

	    if (p_ri && c == NL && curwin->w_cursor.col)
	    {
		/*
		 * If the char before the cursor is _X_ or X_ do not change
		 * the one under the cursor with X type.
		*/

		dec_cursor();

		if (F_isalpha(gchar_cursor()))
		{
		    inc_cursor();
		    return NL;
		}

		inc_cursor();
	    }

	    if (!p_ri && !curwin->w_cursor.col)
	    {
		switch (c)
		{
		    case '0':	return FARSI_0;
		    case '1':	return FARSI_1;
		    case '2':	return FARSI_2;
		    case '3':	return FARSI_3;
		    case '4':	return FARSI_4;
		    case '5':	return FARSI_5;
		    case '6':	return FARSI_6;
		    case '7':	return FARSI_7;
		    case '8':	return FARSI_8;
		    case '9':	return FARSI_9;
		    case 'B':	return F_PSP;
		    case 'E':	return JAZR_N;
		    case 'F':	return ALEF_D_H;
		    case 'H':	return ALEF_A;
		    case 'I':	return TASH;
		    case 'K':	return F_LQUOT;
		    case 'L':	return F_RQUOT;
		    case 'M':	return HAMZE;
		    case 'O':	return '[';
		    case 'P':	return ']';
		    case 'Q':	return OO;
		    case 'R':	return MAD_N;
		    case 'T':	return OW;
		    case 'U':	return MAD;
		    case 'W':	return OW_OW;
		    case 'Y':	return JAZR;
		    case '`':	return F_PCN;
		    case '!':	return F_EXCL;
		    case '@':	return F_COMMA;
		    case '#':	return F_DIVIDE;
		    case '$':	return F_CURRENCY;
		    case '%':	return F_PERCENT;
		    case '^':	return F_MUL;
		    case '&':	return F_BCOMMA;
		    case '*':	return F_STAR;
		    case '(':	return F_LPARENT;
		    case ')':	return F_RPARENT;
		    case '-':	return F_MINUS;
		    case '_':	return F_UNDERLINE;
		    case '=':	return F_EQUALS;
		    case '+':	return F_PLUS;
		    case '\\':	return F_BSLASH;
		    case '|':	return F_PIPE;
		    case ':':	return F_DCOLON;
		    case '"':	return F_SEMICOLON;
		    case '.':	return F_PERIOD;
		    case '/':	return F_SLASH;
		    case '<':	return F_LESS;
		    case '>':	return F_GREATER;
		    case '?':	return F_QUESTION;
		    case ' ':	return F_BLANK;
		}
		break;
	    }
	    if (!p_ri)
		dec_cursor();

	    switch ((tempc = gchar_cursor()))
	    {
		case _BE:
		case _PE:
		case _TE:
		case _SE:
		case _JIM:
		case _CHE:
		case _HE_J:
		case _XE:
		case _SIN:
		case _SHIN:
		case _SAD:
		case _ZAD:
		case _FE:
		case _GHAF:
		case _KAF:
		case _KAF_H:
		case _GAF:
		case _LAM:
		case _MIM:
		case _NOON:
		case _HE:
		case _HE_:
		case _TA:
		case _ZA:
			put_curr_and_l_to_X(toF_TyA(tempc));
			break;
		case _AYN:
		case _AYN_:

			if (!p_ri)
			    if (!curwin->w_cursor.col)
			    {
				put_curr_and_l_to_X(AYN);
				break;
			    }

			if (p_ri)
			    inc_cursor();
			else
			    dec_cursor();

			if (F_is_TyB_TyC_TyD(SRC_EDT, AT_CURSOR))
			    tempc = AYN_;
			else
			    tempc = AYN;

			if (p_ri)
			    dec_cursor();
			else
			    inc_cursor();

			put_curr_and_l_to_X(tempc);

			break;
		case _GHAYN:
		case _GHAYN_:

			if (!p_ri)
			    if (!curwin->w_cursor.col)
			    {
				put_curr_and_l_to_X(GHAYN);
				break;
			    }

			if (p_ri)
			    inc_cursor();
			else
			    dec_cursor();

			if (F_is_TyB_TyC_TyD(SRC_EDT, AT_CURSOR))
			    tempc = GHAYN_;
			else
			    tempc = GHAYN;

			if (p_ri)
			    dec_cursor();
			else
			    inc_cursor();

			put_curr_and_l_to_X(tempc);
			break;
		case _YE:
		case _IE:
		case _YEE:
			if (!p_ri)
			    if (!curwin->w_cursor.col)
			    {
				put_curr_and_l_to_X((tempc == _YE ? YE :
					    (tempc == _IE ? IE : YEE)));
				break;
			    }

			if (p_ri)
			    inc_cursor();
			else
			    dec_cursor();

			if (F_is_TyB_TyC_TyD(SRC_EDT, AT_CURSOR))
				tempc = (tempc == _YE ? YE_ :
				    (tempc == _IE ? IE_ : YEE_));
			else
				tempc = (tempc == _YE ? YE :
				    (tempc == _IE ? IE : YEE));

			if (p_ri)
			    dec_cursor();
			else
			    inc_cursor();

			put_curr_and_l_to_X(tempc);
			break;
		}

		if (!p_ri)
		    inc_cursor();

		tempc = 0;

		switch (c)
		{
		    case '0':	return FARSI_0;
		    case '1':	return FARSI_1;
		    case '2':	return FARSI_2;
		    case '3':	return FARSI_3;
		    case '4':	return FARSI_4;
		    case '5':	return FARSI_5;
		    case '6':	return FARSI_6;
		    case '7':	return FARSI_7;
		    case '8':	return FARSI_8;
		    case '9':	return FARSI_9;
		    case 'B':	return F_PSP;
		    case 'E':	return JAZR_N;
		    case 'F':	return ALEF_D_H;
		    case 'H':	return ALEF_A;
		    case 'I':	return TASH;
		    case 'K':	return F_LQUOT;
		    case 'L':	return F_RQUOT;
		    case 'M':	return HAMZE;
		    case 'O':	return '[';
		    case 'P':	return ']';
		    case 'Q':	return OO;
		    case 'R':	return MAD_N;
		    case 'T':	return OW;
		    case 'U':	return MAD;
		    case 'W':	return OW_OW;
		    case 'Y':	return JAZR;
		    case '`':	return F_PCN;
		    case '!':	return F_EXCL;
		    case '@':	return F_COMMA;
		    case '#':	return F_DIVIDE;
		    case '$':	return F_CURRENCY;
		    case '%':	return F_PERCENT;
		    case '^':	return F_MUL;
		    case '&':	return F_BCOMMA;
		    case '*':	return F_STAR;
		    case '(':	return F_LPARENT;
		    case ')':	return F_RPARENT;
		    case '-':	return F_MINUS;
		    case '_':	return F_UNDERLINE;
		    case '=':	return F_EQUALS;
		    case '+':	return F_PLUS;
		    case '\\':	return F_BSLASH;
		    case '|':	return F_PIPE;
		    case ':':	return F_DCOLON;
		    case '"':	return F_SEMICOLON;
		    case '.':	return F_PERIOD;
		    case '/':	return F_SLASH;
		    case '<':	return F_LESS;
		    case '>':	return F_GREATER;
		    case '?':	return F_QUESTION;
		    case ' ':	return F_BLANK;
		}
		break;

	case 'a':
		tempc = _SHIN;
		break;
	case 'A':
		tempc = WAW_H;
		break;
	case 'b':
		tempc = ZAL;
		break;
	case 'c':
		tempc = ZE;
		break;
	case 'C':
		tempc = JE;
		break;
	case 'd':
		tempc = _YE;
		break;
	case 'D':
		tempc = _YEE;
		break;
	case 'e':
		tempc = _SE;
		break;
	case 'f':
		tempc = _BE;
		break;
	case 'g':
		tempc = _LAM;
		break;
	case 'G':
	    if (!curwin->w_cursor.col  &&  STRLEN(ml_get_curline()))
	    {

		if (gchar_cursor() == _LAM)
		    chg_c_toX_orX ();
		else if (p_ri)
		    chg_c_to_X_or_X ();
	    }

	    if (!p_ri)
		if (!curwin->w_cursor.col)
		    return ALEF_U_H;

	    if (!p_ri)
		dec_cursor();

	    if (gchar_cursor() == _LAM)
	    {
		chg_c_toX_orX ();
		chg_l_toXor_X ();
		tempc = ALEF_U_H;
	    }
	    else if (F_is_TyB_TyC_TyD(SRC_EDT, AT_CURSOR))
	    {
		tempc = ALEF_U_H_;
		chg_l_toXor_X ();
	    }
	    else
		tempc = ALEF_U_H;

	    if (!p_ri)
		inc_cursor();

	    return tempc;
	case 'h':
	    if (!curwin->w_cursor.col  &&  STRLEN(ml_get_curline()))
		{
		if (p_ri)
		    chg_c_to_X_or_X ();

	    }

	    if (!p_ri)
		if (!curwin->w_cursor.col)
		    return ALEF;

	    if (!p_ri)
		dec_cursor();

	    if (gchar_cursor() == _LAM)
	    {
		chg_l_toXor_X();
		del_char(FALSE);
		AppendCharToRedobuff(K_BS);

		if (!p_ri)
		    dec_cursor();

		tempc = LA;
	    }
	    else
	    {
		if (F_is_TyB_TyC_TyD(SRC_EDT, AT_CURSOR))
		{
		    tempc = ALEF_;
		    chg_l_toXor_X ();
		}
		else
		    tempc = ALEF;
	    }

	    if (!p_ri)
		inc_cursor();

	    return tempc;
	case 'i':
	    if (!curwin->w_cursor.col && STRLEN(ml_get_curline()))
	    {
		if (!p_ri && !F_is_TyE(tempc))
		    chg_c_to_X_orX_ ();
		if (p_ri)
		    chg_c_to_X_or_X ();

	    }

	    if (!p_ri && !curwin->w_cursor.col)
		return _HE;

	    if (!p_ri)
		dec_cursor();

	    if (F_is_TyB_TyC_TyD(SRC_EDT, AT_CURSOR))
		tempc = _HE_;
	    else
		tempc = _HE;

	    if (!p_ri)
		inc_cursor();
	    break;
	case 'j':
		tempc = _TE;
	    break;
	case 'J':
	    if (!curwin->w_cursor.col  &&  STRLEN(ml_get_curline()))
	    {
		if (p_ri)
		    chg_c_to_X_or_X ();

	    }

	    if (!p_ri)
		if (!curwin->w_cursor.col)
		    return TEE;

	    if (!p_ri)
		dec_cursor();

	    if (F_is_TyB_TyC_TyD(SRC_EDT, AT_CURSOR))
	    {
		tempc = TEE_;
		chg_l_toXor_X ();
	    }
	    else
		tempc = TEE;

	    if (!p_ri)
		inc_cursor();

	    return tempc;
	case 'k':
		tempc = _NOON;
	    break;
	case 'l':
		tempc = _MIM;
	    break;
	case 'm':
		tempc = _PE;
	    break;
	case 'n':
	case 'N':
		tempc = DAL;
	    break;
	case 'o':
		tempc = _XE;
	    break;
	case 'p':
		tempc = _HE_J;
	    break;
	case 'q':
		tempc = _ZAD;
	    break;
	case 'r':
		tempc = _GHAF;
	    break;
	case 's':
		tempc = _SIN;
	    break;
	case 'S':
		tempc = _IE;
	    break;
	case 't':
		tempc = _FE;
	    break;
	case 'u':
		if (!curwin->w_cursor.col  &&  STRLEN(ml_get_curline()))
		{
		    if (!p_ri && !F_is_TyE(tempc))
			chg_c_to_X_orX_ ();
		    if (p_ri)
			chg_c_to_X_or_X ();

		}

		if (!p_ri && !curwin->w_cursor.col)
		    return _AYN;

		if (!p_ri)
		    dec_cursor();

		if (F_is_TyB_TyC_TyD(SRC_EDT, AT_CURSOR))
		    tempc = _AYN_;
		else
		    tempc = _AYN;

		if (!p_ri)
		    inc_cursor();
	    break;
	case 'v':
	case 'V':
		tempc = RE;
	    break;
	case 'w':
		tempc = _SAD;
	    break;
	case 'x':
	case 'X':
		tempc = _TA;
	    break;
	case 'y':
	    if (!curwin->w_cursor.col  &&  STRLEN(ml_get_curline()))
	    {
		if (!p_ri && !F_is_TyE(tempc))
		    chg_c_to_X_orX_ ();
		if (p_ri)
		    chg_c_to_X_or_X ();

	    }

	    if (!p_ri && !curwin->w_cursor.col)
		return _GHAYN;

	    if (!p_ri)
		dec_cursor();

	    if (F_is_TyB_TyC_TyD(SRC_EDT, AT_CURSOR))
		tempc = _GHAYN_;
	    else
		tempc = _GHAYN;

	    if (!p_ri)
		inc_cursor();

	    break;
	case 'z':
		tempc = _ZA;
	    break;
	case 'Z':
		tempc = _KAF_H;
	    break;
	case ';':
		tempc = _KAF;
	    break;
	case '\'':
		tempc = _GAF;
	    break;
	case ',':
		tempc = WAW;
	    break;
	case '[':
		tempc = _JIM;
	    break;
	case ']':
		tempc = _CHE;
	    break;
    }

    if ((F_isalpha(tempc) || F_isdigit(tempc)))
    {
	if (!curwin->w_cursor.col  &&  STRLEN(ml_get_curline()))
	{
	    if (!p_ri && !F_is_TyE(tempc))
		chg_c_to_X_orX_ ();
	    if (p_ri)
		chg_c_to_X_or_X ();
	}

	if (curwin->w_cursor.col)
	{
	    if (!p_ri)
		dec_cursor();

	    if (F_is_TyE(tempc))
		chg_l_toXor_X ();
	    else
		chg_l_to_X_orX_ ();

	    if (!p_ri)
		inc_cursor();
	}
    }
    if (tempc)
	return tempc;
    return c;
}

/*
 * Convert a none leading Farsi char into a leading type.
*/
    static int
toF_leading(int c)
{
    switch (c)
    {
	case ALEF_:	return ALEF;
	case ALEF_U_H_:	    return ALEF_U_H;
	case BE:    return _BE;
	case PE:    return _PE;
	case TE:    return _TE;
	case SE:    return _SE;
	case JIM:   return _JIM;
	case CHE:   return _CHE;
	case HE_J:  return _HE_J;
	case XE:    return _XE;
	case SIN:   return _SIN;
	case SHIN:  return _SHIN;
	case SAD:   return _SAD;
	case ZAD:   return _ZAD;

	case AYN:
	case AYN_:
	case _AYN_: return _AYN;

	case GHAYN:
	case GHAYN_:
	case _GHAYN_:	return _GHAYN;

	case FE:    return _FE;
	case GHAF:  return _GHAF;
	case KAF:   return _KAF;
	case GAF:   return _GAF;
	case LAM:   return _LAM;
	case MIM:   return _MIM;
	case NOON:  return _NOON;

	case _HE_:
	case F_HE:	return _HE;

	case YE:
	case YE_:	return _YE;

	case IE_:
	case IE:	return _IE;

	case YEE:
	case YEE_:	return _YEE;
    }
    return c;
}

/*
 * Convert a given Farsi char into right joining type.
*/
    static int
toF_Rjoin(int c)
{
    switch (c)
    {
	case ALEF:  return ALEF_;
	case ALEF_U_H:	return ALEF_U_H_;
	case BE:    return _BE;
	case PE:    return _PE;
	case TE:    return _TE;
	case SE:    return _SE;
	case JIM:   return _JIM;
	case CHE:   return _CHE;
	case HE_J:  return _HE_J;
	case XE:    return _XE;
	case SIN:   return _SIN;
	case SHIN:  return _SHIN;
	case SAD:   return _SAD;
	case ZAD:   return _ZAD;

	case AYN:
	case AYN_:
	case _AYN:  return _AYN_;

	case GHAYN:
	case GHAYN_:
	case _GHAYN_:	return _GHAYN_;

	case FE:    return _FE;
	case GHAF:  return _GHAF;
	case KAF:   return _KAF;
	case GAF:   return _GAF;
	case LAM:   return _LAM;
	case MIM:   return _MIM;
	case NOON:  return _NOON;

	case _HE:
	case F_HE:	return _HE_;

	case YE:
	case YE_:	return _YE;

	case IE_:
	case IE:	return _IE;

	case TEE:	return TEE_;

	case YEE:
	case YEE_:	return _YEE;
    }
    return c;
}

/*
 * Can a given Farsi character join via its left edj.
*/
    static int
canF_Ljoin(int c)
{
    switch (c)
    {
	case _BE:
	case BE:
	case PE:
	case _PE:
	case TE:
	case _TE:
	case SE:
	case _SE:
	case JIM:
	case _JIM:
	case CHE:
	case _CHE:
	case HE_J:
	case _HE_J:
	case XE:
	case _XE:
	case SIN:
	case _SIN:
	case SHIN:
	case _SHIN:
	case SAD:
	case _SAD:
	case ZAD:
	case _ZAD:
	case _TA:
	case _ZA:
	case AYN:
	case _AYN:
	case _AYN_:
	case AYN_:
	case GHAYN:
	case GHAYN_:
	case _GHAYN_:
	case _GHAYN:
	case FE:
	case _FE:
	case GHAF:
	case _GHAF:
	case _KAF_H:
	case KAF:
	case _KAF:
	case GAF:
	case _GAF:
	case LAM:
	case _LAM:
	case MIM:
	case _MIM:
	case NOON:
	case _NOON:
	case IE:
	case _IE:
	case IE_:
	case YE:
	case _YE:
	case YE_:
	case YEE:
	case _YEE:
	case YEE_:
	case F_HE:
	case _HE:
	case _HE_:
	    return TRUE;
    }
    return FALSE;
}

/*
 * Can a given Farsi character join via its right edj.
*/
    static int
canF_Rjoin(int c)
{
    switch (c)
    {
	case ALEF:
	case ALEF_:
	case ALEF_U_H:
	case ALEF_U_H_:
	case DAL:
	case ZAL:
	case RE:
	case JE:
	case ZE:
	case TEE:
	case TEE_:
	case WAW:
	case WAW_H:
	    return TRUE;
    }

    return canF_Ljoin(c);

}

/*
 * is a given Farsi character a terminating type.
*/
    static int
F_isterm(int c)
{
    switch (c)
    {
	case ALEF:
	case ALEF_:
	case ALEF_U_H:
	case ALEF_U_H_:
	case DAL:
	case ZAL:
	case RE:
	case JE:
	case ZE:
	case WAW:
	case WAW_H:
	case TEE:
	case TEE_:
	    return TRUE;
    }

    return FALSE;
}

/*
 * Convert the given Farsi character into a ending type .
*/
    static int
toF_ending(int c)
{
    switch (c)
    {
	case _BE: return BE;
	case _PE: return PE;
	case _TE: return TE;
	case _SE: return SE;
	case _JIM: return JIM;
	case _CHE: return CHE;
	case _HE_J: return HE_J;
	case _XE: return XE;
	case _SIN: return SIN;
	case _SHIN: return SHIN;
	case _SAD: return SAD;
	case _ZAD: return ZAD;
	case _AYN: return AYN;
	case _AYN_: return AYN_;
	case _GHAYN: return GHAYN;
	case _GHAYN_: return GHAYN_;
	case _FE: return FE;
	case _GHAF: return GHAF;
	case _KAF_H:
	case _KAF: return KAF;
	case _GAF: return GAF;
	case _LAM: return LAM;
	case _MIM: return MIM;
	case _NOON: return NOON;
	case _YE: return YE_;
	case YE_: return YE;
	case _YEE: return YEE_;
	case YEE_: return YEE;
	case TEE: return TEE_;
	case _IE: return IE_;
	case IE_: return IE;
	case _HE:
	case _HE_: return F_HE;
    }
    return c;
}

/*
 * Convert the Farsi 3342 standard into Farsi VIM.
*/
    static void
conv_to_pvim(void)
{
    char_u	*ptr;
    int		lnum, llen, i;

    for (lnum = 1; lnum <= curbuf->b_ml.ml_line_count; ++lnum)
    {
	ptr = ml_get((linenr_T)lnum);

	llen = (int)STRLEN(ptr);

	for (i = 0; i < llen-1; i++)
	{
	    if (canF_Ljoin(ptr[i]) && canF_Rjoin(ptr[i+1]))
	    {
		ptr[i] = toF_leading(ptr[i]);
		++i;

		while (canF_Rjoin(ptr[i]) && i < llen)
		{
		    ptr[i] = toF_Rjoin(ptr[i]);
		    if (F_isterm(ptr[i]) || !F_isalpha(ptr[i]))
			break;
		    ++i;
		}
		if (!F_isalpha(ptr[i]) || !canF_Rjoin(ptr[i]))
		    ptr[i-1] = toF_ending(ptr[i-1]);
	    }
	    else
		ptr[i] = toF_TyA(ptr[i]);
	}
    }

    /*
     * Following lines contains Farsi encoded character.
     */

    do_cmdline_cmd((char_u *)"%s/\202\231/\232/ge");
    do_cmdline_cmd((char_u *)"%s/\201\231/\370\334/ge");

    /* Assume the screen has been messed up: clear it and redraw. */
    redraw_later(CLEAR);
    MSG_ATTR(farsi_text_1, hl_attr(HLF_S));
}

/*
 * Convert the Farsi VIM into Farsi 3342 standard.
 */
    static void
conv_to_pstd(void)
{
    char_u	*ptr;
    int		lnum, llen, i;

    /*
     * Following line contains Farsi encoded character.
     */
    do_cmdline_cmd((char_u *)"%s/\232/\202\231/ge");

    for (lnum = 1; lnum <= curbuf->b_ml.ml_line_count; ++lnum)
    {
	ptr = ml_get((linenr_T)lnum);
	llen = (int)STRLEN(ptr);

	for (i = 0; i < llen; i++)
	    ptr[i] = toF_TyA(ptr[i]);
    }

    /* Assume the screen has been messed up: clear it and redraw. */
    redraw_later(CLEAR);
    MSG_ATTR(farsi_text_2, hl_attr(HLF_S));
}

/*
 * left-right swap the characters in buf[len].
 */
    static void
lrswapbuf(char_u *buf, int len)
{
    char_u	*s, *e;
    int		c;

    s = buf;
    e = buf + len - 1;

    while (e > s)
    {
	c = *s;
	*s = *e;
	*e = c;
	++s;
	--e;
    }
}

/*
 * swap all the characters in reverse direction
 */
    char_u *
lrswap(char_u *ibuf)
{
    if (ibuf != NULL && *ibuf != NUL)
	lrswapbuf(ibuf, (int)STRLEN(ibuf));
    return ibuf;
}

/*
 * swap all the Farsi characters in reverse direction
 */
    char_u *
lrFswap(char_u *cmdbuf, int len)
{
    int		i, cnt;

    if (cmdbuf == NULL)
	return cmdbuf;

    if (len == 0 && (len = (int)STRLEN(cmdbuf)) == 0)
	return cmdbuf;

    for (i = 0; i < len; i++)
    {
	for (cnt = 0; i + cnt < len
			&& (F_isalpha(cmdbuf[i + cnt])
			    || F_isdigit(cmdbuf[i + cnt])
			    || cmdbuf[i + cnt] == ' '); ++cnt)
	    ;

	lrswapbuf(cmdbuf + i, cnt);
	i += cnt;
    }
    return cmdbuf;
}

/*
 * Reverse the characters in the search path and substitute section
 * accordingly.
 * TODO: handle different separator characters.  Use skip_regexp().
 */
    char_u *
lrF_sub(char_u *ibuf)
{
    char_u	*p, *ep;
    int		i, cnt;

    p = ibuf;

    /* Find the boundary of the search path */
    while (((p = vim_strchr(p + 1, '/')) != NULL) && p[-1] == '\\')
	;

    if (p == NULL)
	return ibuf;

    /* Reverse the Farsi characters in the search path. */
    lrFswap(ibuf, (int)(p-ibuf));

    /* Now find the boundary of the substitute section */
    if ((ep = (char_u *)strrchr((char *)++p, '/')) != NULL)
	cnt = (int)(ep - p);
    else
	cnt = (int)STRLEN(p);

    /* Reverse the characters in the substitute section and take care of '\' */
    for (i = 0; i < cnt-1; i++)
	if (p[i] == '\\')
	{
	    p[i] = p[i+1] ;
	    p[++i] = '\\';
	}

    lrswapbuf(p, cnt);

    return ibuf;
}

/*
 * Map Farsi keyboard when in cmd_fkmap mode.
 */
    int
cmdl_fkmap(int c)
{
    int	    tempc;

    switch (c)
    {
	case '0':
	case '1':
	case '2':
	case '3':
	case '4':
	case '5':
	case '6':
	case '7':
	case '8':
	case '9':
	case '`':
	case ' ':
	case '.':
	case '!':
	case '"':
	case '$':
	case '%':
	case '^':
	case '&':
	case '/':
	case '(':
	case ')':
	case '=':
	case '\\':
	case '?':
	case '+':
	case '-':
	case '_':
	case '*':
	case ':':
	case '#':
	case '~':
	case '@':
	case '<':
	case '>':
	case '{':
	case '}':
	case '|':
	case 'B':
	case 'E':
	case 'F':
	case 'H':
	case 'I':
	case 'K':
	case 'L':
	case 'M':
	case 'O':
	case 'P':
	case 'Q':
	case 'R':
	case 'T':
	case 'U':
	case 'W':
	case 'Y':
	case  NL:
	case  TAB:

	       switch ((tempc = cmd_gchar(AT_CURSOR)))
	       {
	    case _BE:
	    case _PE:
	    case _TE:
	    case _SE:
	    case _JIM:
	    case _CHE:
	    case _HE_J:
	    case _XE:
	    case _SIN:
	    case _SHIN:
	    case _SAD:
	    case _ZAD:
	    case _AYN:
	    case _GHAYN:
	    case _FE:
	    case _GHAF:
	    case _KAF:
	    case _GAF:
	    case _LAM:
	    case _MIM:
	    case _NOON:
	    case _HE:
	    case _HE_:
			cmd_pchar(toF_TyA(tempc), AT_CURSOR);
		break;
	    case _AYN_:
			cmd_pchar(AYN_, AT_CURSOR);
		break;
	    case _GHAYN_:
			cmd_pchar(GHAYN_, AT_CURSOR);
		break;
	    case _IE:
		if (F_is_TyB_TyC_TyD(SRC_CMD, AT_CURSOR+1))
			    cmd_pchar(IE_, AT_CURSOR);
		else
			    cmd_pchar(IE, AT_CURSOR);
		break;
	    case _YEE:
		if (F_is_TyB_TyC_TyD(SRC_CMD, AT_CURSOR+1))
			    cmd_pchar(YEE_, AT_CURSOR);
			else
			    cmd_pchar(YEE, AT_CURSOR);
		break;
	    case _YE:
		if (F_is_TyB_TyC_TyD(SRC_CMD, AT_CURSOR+1))
			    cmd_pchar(YE_, AT_CURSOR);
			else
			    cmd_pchar(YE, AT_CURSOR);
	    }

	    switch (c)
	    {
		case '0':   return FARSI_0;
		case '1':   return FARSI_1;
		case '2':   return FARSI_2;
		case '3':   return FARSI_3;
		case '4':   return FARSI_4;
		case '5':   return FARSI_5;
		case '6':   return FARSI_6;
		case '7':   return FARSI_7;
		case '8':   return FARSI_8;
		case '9':   return FARSI_9;
		case 'B':   return F_PSP;
		case 'E':   return JAZR_N;
		case 'F':   return ALEF_D_H;
		case 'H':   return ALEF_A;
		case 'I':   return TASH;
		case 'K':   return F_LQUOT;
		case 'L':   return F_RQUOT;
		case 'M':   return HAMZE;
		case 'O':   return '[';
		case 'P':   return ']';
		case 'Q':   return OO;
		case 'R':   return MAD_N;
		case 'T':   return OW;
		case 'U':   return MAD;
		case 'W':   return OW_OW;
		case 'Y':   return JAZR;
		case '`':   return F_PCN;
		case '!':   return F_EXCL;
		case '@':   return F_COMMA;
		case '#':   return F_DIVIDE;
		case '$':   return F_CURRENCY;
		case '%':   return F_PERCENT;
		case '^':   return F_MUL;
		case '&':   return F_BCOMMA;
		case '*':   return F_STAR;
		case '(':   return F_LPARENT;
		case ')':   return F_RPARENT;
		case '-':   return F_MINUS;
		case '_':   return F_UNDERLINE;
		case '=':   return F_EQUALS;
		case '+':   return F_PLUS;
		case '\\':  return F_BSLASH;
		case '|':   return F_PIPE;
		case ':':   return F_DCOLON;
		case '"':   return F_SEMICOLON;
		case '.':   return F_PERIOD;
		case '/':   return F_SLASH;
		case '<':   return F_LESS;
		case '>':   return F_GREATER;
		case '?':   return F_QUESTION;
		case ' ':   return F_BLANK;
	    }

	    break;

	case 'a':   return _SHIN;
	case 'A':   return WAW_H;
	case 'b':   return ZAL;
	case 'c':   return ZE;
	case 'C':   return JE;
	case 'd':   return _YE;
	case 'D':   return _YEE;
	case 'e':   return _SE;
	case 'f':   return _BE;
	case 'g':   return _LAM;
	case 'G':
		if (cmd_gchar(AT_CURSOR) == _LAM)
		{
		    cmd_pchar(LAM, AT_CURSOR);
			    return ALEF_U_H;
		}

		if (F_is_TyB_TyC_TyD(SRC_CMD, AT_CURSOR))
			return ALEF_U_H_;
		else
			return ALEF_U_H;
	case 'h':
		if (cmd_gchar(AT_CURSOR) == _LAM)
		{
		    cmd_pchar(LA, AT_CURSOR);
		    redrawcmdline();
		    return K_IGNORE;
		}

		if (F_is_TyB_TyC_TyD(SRC_CMD, AT_CURSOR))
			return ALEF_;
		else
			return ALEF;
	case 'i':
		if (F_is_TyB_TyC_TyD(SRC_CMD, AT_CURSOR))
			return _HE_;
		else
			return _HE;
	case 'j':   return _TE;
	case 'J':
		if (F_is_TyB_TyC_TyD(SRC_CMD, AT_CURSOR))
			return TEE_;
		else
			return TEE;
	case 'k':   return _NOON;
	case 'l':   return _MIM;
	case 'm':   return _PE;
	case 'n':
	case 'N':   return DAL;
	case 'o':   return _XE;
	case 'p':   return _HE_J;
	case 'q':   return _ZAD;
	case 'r':   return _GHAF;
	case 's':   return _SIN;
	case 'S':   return _IE;
	case 't':   return _FE;
	case 'u':
		if (F_is_TyB_TyC_TyD(SRC_CMD, AT_CURSOR))
			return _AYN_;
		else
			return _AYN;
	case 'v':
	case 'V':   return RE;
	case 'w':   return _SAD;
	case 'x':
	case 'X':   return _TA;
	case 'y':
		if (F_is_TyB_TyC_TyD(SRC_CMD, AT_CURSOR))
			return _GHAYN_;
		else
			return _GHAYN;
	case 'z':
	case 'Z':   return _ZA;
	case ';':   return _KAF;
	case '\'':  return _GAF;
	case ',':   return WAW;
	case '[':   return _JIM;
	case ']':   return _CHE;
    }

    return c;
}

/*
 * F_isalpha returns TRUE if 'c' is a Farsi alphabet
 */
    int
F_isalpha(int c)
{
    return ((c >= TEE_ && c <= _YE)
	    || (c >= ALEF_A && c <= YE)
	    || (c >= _IE && c <= YE_));
}

/*
 * F_isdigit returns TRUE if 'c' is a Farsi digit
 */
    int
F_isdigit(int c)
{
    return (c >= FARSI_0 && c <= FARSI_9);
}

/*
 * F_ischar returns TRUE if 'c' is a Farsi character.
 */
    int
F_ischar(int c)
{
    return (c >= TEE_ && c <= YE_);
}

    void
farsi_f8(cmdarg_T *cap UNUSED)
{
    if (p_altkeymap)
    {
	if (curwin->w_farsi & W_R_L)
	{
	    p_fkmap = 0;
	    do_cmdline_cmd((char_u *)"set norl");
	    MSG("");
	}
	else
	{
	    p_fkmap = 1;
	    do_cmdline_cmd((char_u *)"set rl");
	    MSG("");
	}

	curwin->w_farsi = curwin->w_farsi ^ W_R_L;
    }
}

    void
farsi_f9(cmdarg_T *cap UNUSED)
{
    if (p_altkeymap && curwin->w_p_rl)
    {
	curwin->w_farsi = curwin->w_farsi ^ W_CONV;
	if (curwin->w_farsi & W_CONV)
	    conv_to_pvim();
	else
	    conv_to_pstd();
    }
}