[p5sagit/p5-mst-13.2.git] / ext / Unicode / Normalize / Normalize.xs


#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"

/* These 5 files are prepared by mkheader */
#include "unfcmb.h"
#include "unfcan.h"
#include "unfcpt.h"
#include "unfcmp.h"
#include "unfexc.h"

/* Perl 5.6.1 ? */
#ifndef uvuni_to_utf8
#define uvuni_to_utf8   uv_to_utf8
#endif /* uvuni_to_utf8 */

/* Perl 5.6.1 ? */
#ifndef utf8n_to_uvuni
#define utf8n_to_uvuni  utf8_to_uv
#endif /* utf8n_to_uvuni */

/* UTF8_ALLOW_BOM is used before Perl 5.8.0 */
#ifdef UTF8_ALLOW_BOM
#define AllowAnyUTF (UTF8_ALLOW_SURROGATE|UTF8_ALLOW_BOM|UTF8_ALLOW_FFFF)
#else 
#define AllowAnyUTF (UTF8_ALLOW_SURROGATE|UTF8_ALLOW_FFFF)
#endif

/* if utf8n_to_uvuni() sets retlen to 0 (?) */
#define ErrRetlenIsZero "panic (Unicode::Normalize): zero-length character"

/* utf8_hop() hops back before start. Maybe broken UTF-8 */
#define ErrHopBeforeStart "panic (Unicode::Normalize): hopping before start"

/* At present, char > 0x10ffff are unaffected without complaint, right? */
#define VALID_UTF_MAX    (0x10ffff)
#define OVER_UTF_MAX(uv) (VALID_UTF_MAX < (uv))

/* HANGUL_H */
#define Hangul_SBase  0xAC00
#define Hangul_SFinal 0xD7A3
#define Hangul_SCount  11172

#define Hangul_NCount    588

#define Hangul_LBase  0x1100
#define Hangul_LFinal 0x1112
#define Hangul_LCount     19

#define Hangul_VBase  0x1161
#define Hangul_VFinal 0x1175
#define Hangul_VCount     21

#define Hangul_TBase  0x11A7
#define Hangul_TFinal 0x11C2
#define Hangul_TCount     28

#define Hangul_IsS(u)  ((Hangul_SBase <= (u)) && ((u) <= Hangul_SFinal))
#define Hangul_IsN(u)  (((u) - Hangul_SBase) % Hangul_TCount == 0)
#define Hangul_IsLV(u) (Hangul_IsS(u) && Hangul_IsN(u))
#define Hangul_IsL(u)  ((Hangul_LBase <= (u)) && ((u) <= Hangul_LFinal))
#define Hangul_IsV(u)  ((Hangul_VBase <= (u)) && ((u) <= Hangul_VFinal))
#define Hangul_IsT(u)  ((Hangul_TBase  < (u)) && ((u) <= Hangul_TFinal))
/* HANGUL_H */

/* this is used for canonical ordering of combining characters (c.c.). */
typedef struct {
    U8 cc;	/* combining class */
    UV uv;	/* codepoint */
    STRLEN pos; /* position */
} UNF_cc;

static int compare_cc (const void *a, const void *b)
{
    int ret_cc;
    ret_cc = ((UNF_cc*) a)->cc - ((UNF_cc*) b)->cc;
    if (ret_cc)
	return ret_cc;

    return ( ((UNF_cc*) a)->pos > ((UNF_cc*) b)->pos )
	 - ( ((UNF_cc*) a)->pos < ((UNF_cc*) b)->pos );
}

static U8* dec_canonical (UV uv)
{
    U8 ***plane, **row;
    if (OVER_UTF_MAX(uv))
	return NULL;
    plane = (U8***)UNF_canon[uv >> 16];
    if (! plane)
	return NULL;
    row = plane[(uv >> 8) & 0xff];
    return row ? row[uv & 0xff] : NULL;
}

static U8* dec_compat (UV uv)
{
    U8 ***plane, **row;
    if (OVER_UTF_MAX(uv))
	return NULL;
    plane = (U8***)UNF_compat[uv >> 16];
    if (! plane)
	return NULL;
    row = plane[(uv >> 8) & 0xff];
    return row ? row[uv & 0xff] : NULL;
}

static UV composite_uv (UV uv, UV uv2)
{
    UNF_complist ***plane, **row, *cell, *i;

    if (! uv2 || OVER_UTF_MAX(uv) || OVER_UTF_MAX(uv2))
	return 0;

    if (Hangul_IsL(uv) && Hangul_IsV(uv2)) {
	uv  -= Hangul_LBase; /* lindex */
	uv2 -= Hangul_VBase; /* vindex */
	return(Hangul_SBase + (uv * Hangul_VCount + uv2) * Hangul_TCount);
    }
    if (Hangul_IsLV(uv) && Hangul_IsT(uv2)) {
	uv2 -= Hangul_TBase; /* tindex */
	return(uv + uv2);
    }
    plane = UNF_compos[uv >> 16];
    if (! plane)
	return 0;
    row = plane[(uv >> 8) & 0xff];
    if (! row)
	return 0;
    cell = row[uv & 0xff];
    if (! cell)
	return 0;
    for (i = cell; i->nextchar; i++) {
	if (uv2 == i->nextchar)
	    return i->composite;
    }
    return 0;
}

static U8 getCombinClass (UV uv)
{
    U8 **plane, *row;
    if (OVER_UTF_MAX(uv))
	return 0;
    plane = (U8**)UNF_combin[uv >> 16];
    if (! plane)
	return 0;
    row = plane[(uv >> 8) & 0xff];
    return row ? row[uv & 0xff] : 0;
}

static void sv_cat_decompHangul (SV* sv, UV uv)
{
    UV sindex, lindex, vindex, tindex;
    U8 *t, tmp[3 * UTF8_MAXLEN + 1];

    if (! Hangul_IsS(uv))
	return;

    sindex =  uv - Hangul_SBase;
    lindex =  sindex / Hangul_NCount;
    vindex = (sindex % Hangul_NCount) / Hangul_TCount;
    tindex =  sindex % Hangul_TCount;

    t = tmp;
    t = uvuni_to_utf8(t, (lindex + Hangul_LBase));
    t = uvuni_to_utf8(t, (vindex + Hangul_VBase));
    if (tindex)
	t = uvuni_to_utf8(t, (tindex + Hangul_TBase));
    *t = '\0';
    sv_catpvn(sv, (char *)tmp, t - tmp);
}

static void sv_cat_uvuni (SV* sv, UV uv)
{
    U8 *t, tmp[UTF8_MAXLEN + 1];

    t = tmp;
    t = uvuni_to_utf8(t, uv);
    *t = '\0';
    sv_catpvn(sv, (char *)tmp, t - tmp);
}

static char * sv_2pvunicode(SV *sv, STRLEN *lp)
{
    char *s;
    STRLEN len;
    s = (char*)SvPV(sv,len);
    if (!SvUTF8(sv)) {
	SV* tmpsv = sv_mortalcopy(sv);
	if (!SvPOK(tmpsv))
	    (void)sv_pvn_force(tmpsv,&len);
	sv_utf8_upgrade(tmpsv);
	s = (char*)SvPV(tmpsv,len);
    }
    *lp = len;
    return s;
}

MODULE = Unicode::Normalize	PACKAGE = Unicode::Normalize

SV*
decompose(src, compat = &PL_sv_no)
    SV * src
    SV * compat
  PROTOTYPE: $;$
  PREINIT:
    SV *dst;
    STRLEN srclen, retlen;
    U8 *s, *e, *p, *r;
    UV uv;
    bool iscompat;
  CODE:
    iscompat = SvTRUE(compat);
    s = (U8*)sv_2pvunicode(src,&srclen);
    e = s + srclen;

    dst = newSV(1);
    (void)SvPOK_only(dst);
    SvUTF8_on(dst);

    for (p = s; p < e; p += retlen) {
	uv = utf8n_to_uvuni(p, e - p, &retlen, AllowAnyUTF);
	if (!retlen)
	    croak(ErrRetlenIsZero);

	if (Hangul_IsS(uv))
	    sv_cat_decompHangul(dst, uv);
	else {
	    r = iscompat ? dec_compat(uv) : dec_canonical(uv);
	    if (r)
		sv_catpv(dst, (char *)r);
	    else
		sv_cat_uvuni(dst, uv);
	}
    }
    RETVAL = dst;
  OUTPUT:
    RETVAL


SV*
reorder(src)
    SV * src
  PROTOTYPE: $
  PREINIT:
    SV *dst;
    STRLEN srclen, dstlen, retlen, stk_cc_max;
    U8 *s, *e, *p, *d, curCC;
    UV uv, uvlast;
    UNF_cc * stk_cc;
    STRLEN i, cc_pos;
    bool valid_uvlast;
  CODE:
    s = (U8*)sv_2pvunicode(src,&srclen);
    e = s + srclen;

    dstlen = srclen + 1;
    dst = newSV(dstlen);
    (void)SvPOK_only(dst);
    SvUTF8_on(dst);
    d = (U8*)SvPVX(dst);

    stk_cc_max = 10; /* enough as an initial value? */
    New(0, stk_cc, stk_cc_max, UNF_cc);

    for (p = s; p < e;) {
	uv = utf8n_to_uvuni(p, e - p, &retlen, AllowAnyUTF);
	if (!retlen)
	    croak(ErrRetlenIsZero);
	p += retlen;

	curCC = getCombinClass(uv);
	if (curCC == 0) {
	    d = uvuni_to_utf8(d, uv);
	    continue;
	}

	cc_pos = 0;
	stk_cc[cc_pos].cc  = curCC;
	stk_cc[cc_pos].uv  = uv;
	stk_cc[cc_pos].pos = cc_pos;

	valid_uvlast = FALSE;
	while (p < e) {
	    uv = utf8n_to_uvuni(p, e - p, &retlen, AllowAnyUTF);
	    if (!retlen)
		croak(ErrRetlenIsZero);
	    p += retlen;

	    curCC = getCombinClass(uv);
	    if (curCC == 0) {
		uvlast = uv;
		valid_uvlast = TRUE;
		break;
	    }

	    cc_pos++;
	    if (stk_cc_max <= cc_pos) { /* extend if need */
		stk_cc_max = cc_pos + 1;
		Renew(stk_cc, stk_cc_max, UNF_cc);
	    }
	    stk_cc[cc_pos].cc  = curCC;
	    stk_cc[cc_pos].uv  = uv;
	    stk_cc[cc_pos].pos = cc_pos;
	}

	/* reordered if there are two c.c.'s */
	if (cc_pos) {
	    qsort((void*)stk_cc, cc_pos + 1, sizeof(UNF_cc), compare_cc);
	}

	for (i = 0; i <= cc_pos; i++) {
	    d = uvuni_to_utf8(d, stk_cc[i].uv);
	}
	if (valid_uvlast)
	{
	    d = uvuni_to_utf8(d, uvlast);
	}
    }
    *d = '\0';
    SvCUR_set(dst, d - (U8*)SvPVX(dst));
    Safefree(stk_cc);
    RETVAL = dst;
  OUTPUT:
    RETVAL


SV*
compose(src)
    SV * src
  PROTOTYPE: $
  ALIAS:
    composeContiguous = 1
  PREINIT:
    SV  *dst, *tmp;
    U8  *s, *p, *e, *d, *t, *tmp_start, curCC, preCC;
    UV uv, uvS, uvComp;
    STRLEN srclen, dstlen, tmplen, retlen;
    bool beginning = TRUE;
  CODE:
    s = (U8*)sv_2pvunicode(src,&srclen);
    e = s + srclen;

    dstlen = srclen + 1;
    dst = newSV(dstlen);
    (void)SvPOK_only(dst);
    SvUTF8_on(dst);
    d = (U8*)SvPVX(dst);

  /* for uncomposed combining char */
    tmp = sv_2mortal(newSV(dstlen));
    (void)SvPOK_only(tmp);
    SvUTF8_on(tmp);

    for (p = s; p < e;) {
	if (beginning) {
	    uvS = utf8n_to_uvuni(p, e - p, &retlen, AllowAnyUTF);
	    if (!retlen)
		croak(ErrRetlenIsZero);
	    p += retlen;

            if (getCombinClass(uvS)) { /* no Starter found yet */
		d = uvuni_to_utf8(d, uvS);
		continue;
	    }
            beginning = FALSE;
	}

    /* Starter */
	t = tmp_start = (U8*)SvPVX(tmp);
	preCC = 0;

    /* to the next Starter */
	while (p < e) {
	    uv = utf8n_to_uvuni(p, e - p, &retlen, AllowAnyUTF);
	    if (!retlen)
		croak(ErrRetlenIsZero);
	    p += retlen;

	    curCC = getCombinClass(uv);

	    if (preCC && preCC == curCC) {
		preCC = curCC;
		t = uvuni_to_utf8(t, uv);
	    } else {
		uvComp = composite_uv(uvS, uv);

		if (uvComp && ! isExclusion(uvComp) &&
			(ix ? (t == tmp_start) : (preCC <= curCC))) {
		    STRLEN leftcur, rightcur, dstcur;
		    leftcur  = UNISKIP(uvComp);
		    rightcur = UNISKIP(uvS) + UNISKIP(uv);

		    if (leftcur > rightcur) {
			dstcur = d - (U8*)SvPVX(dst);
			dstlen += leftcur - rightcur;
			d = (U8*)SvGROW(dst,dstlen) + dstcur;
		    }
		    /* preCC not changed to curCC */
		    uvS = uvComp;
		} else if (! curCC && p < e) { /* blocked */
		    break;
		} else {
		    preCC = curCC;
		    t = uvuni_to_utf8(t, uv);
		}
	    }
	}
	d = uvuni_to_utf8(d, uvS); /* starter (composed or not) */
	tmplen = t - tmp_start;
	if (tmplen) { /* uncomposed combining char */
	    t = (U8*)SvPVX(tmp);
	    while (tmplen--)
		*d++ = *t++;
	}
	uvS = uv;
    } /* for */
    *d = '\0';
    SvCUR_set(dst, d - (U8*)SvPVX(dst));
    RETVAL = dst;
  OUTPUT:
    RETVAL


void
checkNFD(src)
    SV * src
  PROTOTYPE: $
  ALIAS:
    checkNFKD = 1
  PREINIT:
    STRLEN srclen, retlen;
    U8 *s, *e, *p, curCC, preCC;
    UV uv;
  CODE:
    s = (U8*)sv_2pvunicode(src,&srclen);
    e = s + srclen;

    preCC = 0;
    for (p = s; p < e; p += retlen) {
	uv = utf8n_to_uvuni(p, e - p, &retlen, AllowAnyUTF);
	if (!retlen)
	    croak(ErrRetlenIsZero);

	curCC = getCombinClass(uv);
	if (preCC > curCC && curCC != 0) /* canonical ordering violated */
	    XSRETURN_NO;
	if (Hangul_IsS(uv) || (ix ? dec_compat(uv) : dec_canonical(uv)))
	    XSRETURN_NO;
	preCC = curCC;
    }
    XSRETURN_YES;


void
checkNFC(src)
    SV * src
  PROTOTYPE: $
  ALIAS:
    checkNFKC = 1
  PREINIT:
    STRLEN srclen, retlen;
    U8 *s, *e, *p, curCC, preCC;
    UV uv;
    bool isMAYBE;
  CODE:
    s = (U8*)sv_2pvunicode(src,&srclen);
    e = s + srclen;

    preCC = 0;
    isMAYBE = FALSE;
    for (p = s; p < e; p += retlen) {
	uv = utf8n_to_uvuni(p, e - p, &retlen, AllowAnyUTF);
	if (!retlen)
	    croak(ErrRetlenIsZero);

	curCC = getCombinClass(uv);

	if (preCC > curCC && curCC != 0) /* canonical ordering violated */
	    XSRETURN_NO;

	/* get NFC/NFKC property */
	if (Hangul_IsS(uv)) /* Hangul syllables are canonical composites */
	    ; /* YES */
	else if (isExclusion(uv) || isSingleton(uv) || isNonStDecomp(uv))
	    XSRETURN_NO;
	else if (isComp2nd(uv))
	    isMAYBE = TRUE;
	else if (ix) {
	    char *canon, *compat;
	  /* NFKC_NO when having compatibility mapping. */
	    canon  = (char *) dec_canonical(uv);
	    compat = (char *) dec_compat(uv);
	    if (compat && !(canon && strEQ(canon, compat)))
		XSRETURN_NO;
	} /* end of get NFC/NFKC property */

	preCC = curCC;
    }
    if (isMAYBE)
	XSRETURN_UNDEF;
    else
	XSRETURN_YES;


void
checkFCD(src)
    SV * src
  PROTOTYPE: $
  ALIAS:
    checkFCC = 1
  PREINIT:
    STRLEN srclen, retlen, canlen, canret;
    U8 *s, *e, *p, curCC, preCC;
    UV uv, uvLead, uvTrail;
    U8 *sCan, *pCan, *eCan;
    bool isMAYBE;
  CODE:
    s = (U8*)sv_2pvunicode(src,&srclen);
    e = s + srclen;

    preCC = 0;
    isMAYBE = FALSE;
    for (p = s; p < e; p += retlen) {
	uv = utf8n_to_uvuni(p, e - p, &retlen, AllowAnyUTF);
	if (!retlen)
	    croak(ErrRetlenIsZero);

	sCan = (U8*) dec_canonical(uv);

	if (sCan) {
	    canlen = (STRLEN)strlen((char *) sCan);
	    uvLead = utf8n_to_uvuni(sCan, canlen, &canret, AllowAnyUTF);
	}
	else {
	    uvLead = uv;
	}

	curCC = getCombinClass(uvLead);

	if (curCC != 0 && curCC < preCC) /* canonical ordering violated */
	    XSRETURN_NO;

	if (ix) {
	    if (isExclusion(uv) || isSingleton(uv) || isNonStDecomp(uv))
		XSRETURN_NO;
	    else if (isComp2nd(uv))
		isMAYBE = TRUE;
	}

	if (sCan) {
	    eCan = sCan + canlen;
	    pCan = utf8_hop(eCan, -1);
	    if (pCan < sCan)
		croak(ErrHopBeforeStart);
	    uvTrail = utf8n_to_uvuni(pCan, eCan - pCan, &canret, AllowAnyUTF);
	    preCC = getCombinClass(uvTrail);
	}
	else {
	    preCC = curCC;
	}
    }
    if (isMAYBE)
	XSRETURN_UNDEF;
    else
	XSRETURN_YES;


U8
getCombinClass(uv)
    UV uv
  PROTOTYPE: $

bool
isExclusion(uv)
    UV uv
  PROTOTYPE: $

bool
isSingleton(uv)
    UV uv
  PROTOTYPE: $

bool
isNonStDecomp(uv)
    UV uv
  PROTOTYPE: $

bool
isComp2nd(uv)
    UV uv
  PROTOTYPE: $
  ALIAS:
    isNFC_MAYBE  = 1
    isNFKC_MAYBE = 2


void
isNFD_NO(uv)
    UV uv
  PROTOTYPE: $
  ALIAS:
    isNFKD_NO = 1
  CODE:
    if (Hangul_IsS(uv) || (ix ? dec_compat(uv) : dec_canonical(uv)))
	XSRETURN_YES; /* NFD_NO or NFKD_NO */
    else
	XSRETURN_NO;


void
isComp_Ex(uv)
    UV uv
  PROTOTYPE: $
  ALIAS:
    isNFC_NO  = 0
    isNFKC_NO = 1
  CODE:
    if (isExclusion(uv) || isSingleton(uv) || isNonStDecomp(uv))
	XSRETURN_YES; /* NFC_NO or NFKC_NO */
    else if (ix) {
	char *canon, *compat;
	canon  = (char *) dec_canonical(uv);
	compat = (char *) dec_compat(uv);
	if (compat && (!canon || strNE(canon, compat)))
	    XSRETURN_YES; /* NFC_NO or NFKC_NO */
	else
	    XSRETURN_NO;
    }
    else
	XSRETURN_NO;


SV*
getComposite(uv, uv2)
    UV uv
    UV uv2
  PROTOTYPE: $$
  PREINIT:
    UV composite;
  CODE:
    composite = composite_uv(uv, uv2);
    RETVAL = composite ? newSVuv(composite) : &PL_sv_undef;
  OUTPUT:
    RETVAL


SV*
getCanon(uv)
    UV uv
  PROTOTYPE: $
  ALIAS:
    getCompat = 1
  PREINIT:
    U8 * rstr;
  CODE:
    if (Hangul_IsS(uv)) {
	SV * dst;
	dst = newSV(1);
	(void)SvPOK_only(dst);
	sv_cat_decompHangul(dst, uv);
	RETVAL = dst;
    } else {
	rstr = ix ? dec_compat(uv) : dec_canonical(uv);
	if (!rstr)
	    XSRETURN_UNDEF;
	RETVAL = newSVpvn((char *)rstr, strlen((char *)rstr));
    }
    SvUTF8_on(RETVAL);
  OUTPUT:
    RETVAL


void
splitOnLastStarter(src)
    SV * src
  PREINIT:
    SV *svp;
    STRLEN srclen, retlen;
    U8 *s, *e, *p;
    UV uv;
  PPCODE:
    s = (U8*)sv_2pvunicode(src,&srclen);
    e = s + srclen;

    for (p = e; s < p; ) {
	p = utf8_hop(p, -1);
	if (p < s)
	    croak(ErrHopBeforeStart);
	uv = utf8n_to_uvuni(p, e - p, &retlen, AllowAnyUTF);
	if (getCombinClass(uv) == 0) /* Last Starter found */
	    break;
    }

    svp = sv_2mortal(newSVpvn((char*)s, p - s));
    SvUTF8_on(svp);
    XPUSHs(svp);

    svp = sv_2mortal(newSVpvn((char*)p, e - p));
    SvUTF8_on(svp);
    XPUSHs(svp);
Commit	Line	Data
ac5ea531	1
	2	#include "EXTERN.h"
	3	#include "perl.h"
	4	#include "XSUB.h"
	5
	6	/* These 5 files are prepared by mkheader */
	7	#include "unfcmb.h"
	8	#include "unfcan.h"
	9	#include "unfcpt.h"
	10	#include "unfcmp.h"
	11	#include "unfexc.h"
	12
	13	/* Perl 5.6.1 ? */
	14	#ifndef uvuni_to_utf8
	15	#define uvuni_to_utf8 uv_to_utf8
6c941e0c	16	#endif /* uvuni_to_utf8 */
ac5ea531	17
ac5ea531	18	/* Perl 5.6.1 ? */
ab8fe378	19	#ifndef utf8n_to_uvuni
ab8fe378	20	#define utf8n_to_uvuni utf8_to_uv
6c941e0c	21	#endif /* utf8n_to_uvuni */
ac5ea531	22
e524f5b2	23	/* UTF8_ALLOW_BOM is used before Perl 5.8.0 */
	24	#ifdef UTF8_ALLOW_BOM
	25	#define AllowAnyUTF (UTF8_ALLOW_SURROGATE\|UTF8_ALLOW_BOM\|UTF8_ALLOW_FFFF)
	26	#else
	27	#define AllowAnyUTF (UTF8_ALLOW_SURROGATE\|UTF8_ALLOW_FFFF)
	28	#endif
	29
	30	/* if utf8n_to_uvuni() sets retlen to 0 (?) */
82e740b6	31	#define ErrRetlenIsZero "panic (Unicode::Normalize): zero-length character"
	32
	33	/* utf8_hop() hops back before start. Maybe broken UTF-8 */
	34	#define ErrHopBeforeStart "panic (Unicode::Normalize): hopping before start"
	35
ac5ea531	36	/* At present, char > 0x10ffff are unaffected without complaint, right? */
	37	#define VALID_UTF_MAX (0x10ffff)
	38	#define OVER_UTF_MAX(uv) (VALID_UTF_MAX < (uv))
	39
	40	/* HANGUL_H */
	41	#define Hangul_SBase 0xAC00
	42	#define Hangul_SFinal 0xD7A3
	43	#define Hangul_SCount 11172
	44
	45	#define Hangul_NCount 588
	46
	47	#define Hangul_LBase 0x1100
	48	#define Hangul_LFinal 0x1112
	49	#define Hangul_LCount 19
	50
	51	#define Hangul_VBase 0x1161
	52	#define Hangul_VFinal 0x1175
	53	#define Hangul_VCount 21
	54
	55	#define Hangul_TBase 0x11A7
	56	#define Hangul_TFinal 0x11C2
	57	#define Hangul_TCount 28
	58
	59	#define Hangul_IsS(u) ((Hangul_SBase <= (u)) && ((u) <= Hangul_SFinal))
2a204b45	60	#define Hangul_IsN(u) (((u) - Hangul_SBase) % Hangul_TCount == 0)
ac5ea531	61	#define Hangul_IsLV(u) (Hangul_IsS(u) && Hangul_IsN(u))
	62	#define Hangul_IsL(u) ((Hangul_LBase <= (u)) && ((u) <= Hangul_LFinal))
	63	#define Hangul_IsV(u) ((Hangul_VBase <= (u)) && ((u) <= Hangul_VFinal))
	64	#define Hangul_IsT(u) ((Hangul_TBase < (u)) && ((u) <= Hangul_TFinal))
	65	/* HANGUL_H */
	66
	67	/* this is used for canonical ordering of combining characters (c.c.). */
	68	typedef struct {
	69	U8 cc; /* combining class */
	70	UV uv; /* codepoint */
	71	STRLEN pos; /* position */
	72	} UNF_cc;
	73
e524f5b2	74	static int compare_cc (const void a, const void b)
ac5ea531	75	{
ac5ea531	76	int ret_cc;
6c941e0c	77	ret_cc = ((UNF_cc) a)->cc - ((UNF_cc) b)->cc;
8f118dcd	78	if (ret_cc)
8f118dcd	79	return ret_cc;
6c941e0c	80
	81	return ( ((UNF_cc) a)->pos > ((UNF_cc) b)->pos )
	82	- ( ((UNF_cc) a)->pos < ((UNF_cc) b)->pos );
ac5ea531	83	}
ac5ea531	84
e524f5b2	85	static U8* dec_canonical (UV uv)
ac5ea531	86	{
ac5ea531	87	U8 *plane, row;
8f118dcd	88	if (OVER_UTF_MAX(uv))
8f118dcd	89	return NULL;
ac5ea531	90	plane = (U8***)UNF_canon[uv >> 16];
8f118dcd	91	if (! plane)
8f118dcd	92	return NULL;
ac5ea531	93	row = plane[(uv >> 8) & 0xff];
	94	return row ? row[uv & 0xff] : NULL;
	95	}
	96
e524f5b2	97	static U8* dec_compat (UV uv)
ac5ea531	98	{
ac5ea531	99	U8 *plane, row;
8f118dcd	100	if (OVER_UTF_MAX(uv))
8f118dcd	101	return NULL;
ac5ea531	102	plane = (U8***)UNF_compat[uv >> 16];
8f118dcd	103	if (! plane)
8f118dcd	104	return NULL;
ac5ea531	105	row = plane[(uv >> 8) & 0xff];
	106	return row ? row[uv & 0xff] : NULL;
	107	}
	108
e524f5b2	109	static UV composite_uv (UV uv, UV uv2)
ac5ea531	110	{
	111	UNF_complist *plane, row, cell, i;
	112
8f118dcd	113	if (! uv2 \|\| OVER_UTF_MAX(uv) \|\| OVER_UTF_MAX(uv2))
8f118dcd	114	return 0;
ac5ea531	115
8f118dcd	116	if (Hangul_IsL(uv) && Hangul_IsV(uv2)) {
ac5ea531	117	uv -= Hangul_LBase; /* lindex */
	118	uv2 -= Hangul_VBase; /* vindex */
	119	return(Hangul_SBase + (uv * Hangul_VCount + uv2) * Hangul_TCount);
	120	}
8f118dcd	121	if (Hangul_IsLV(uv) && Hangul_IsT(uv2)) {
ac5ea531	122	uv2 -= Hangul_TBase; /* tindex */
2a204b45	123	return(uv + uv2);
ac5ea531	124	}
ac5ea531	125	plane = UNF_compos[uv >> 16];
8f118dcd	126	if (! plane)
8f118dcd	127	return 0;
ac5ea531	128	row = plane[(uv >> 8) & 0xff];
8f118dcd	129	if (! row)
8f118dcd	130	return 0;
ac5ea531	131	cell = row[uv & 0xff];
8f118dcd	132	if (! cell)
	133	return 0;
	134	for (i = cell; i->nextchar; i++) {
	135	if (uv2 == i->nextchar)
	136	return i->composite;
ac5ea531	137	}
	138	return 0;
	139	}
	140
e524f5b2	141	static U8 getCombinClass (UV uv)
ac5ea531	142	{
ac5ea531	143	U8 *plane, row;
8f118dcd	144	if (OVER_UTF_MAX(uv))
8f118dcd	145	return 0;
ac5ea531	146	plane = (U8**)UNF_combin[uv >> 16];
8f118dcd	147	if (! plane)
8f118dcd	148	return 0;
ac5ea531	149	row = plane[(uv >> 8) & 0xff];
	150	return row ? row[uv & 0xff] : 0;
	151	}
	152
e524f5b2	153	static void sv_cat_decompHangul (SV* sv, UV uv)
ac5ea531	154	{
ac5ea531	155	UV sindex, lindex, vindex, tindex;
2a204b45	156	U8 t, tmp[3 UTF8_MAXLEN + 1];
ac5ea531	157
8f118dcd	158	if (! Hangul_IsS(uv))
8f118dcd	159	return;
ac5ea531	160
	161	sindex = uv - Hangul_SBase;
	162	lindex = sindex / Hangul_NCount;
	163	vindex = (sindex % Hangul_NCount) / Hangul_TCount;
	164	tindex = sindex % Hangul_TCount;
	165
2a204b45	166	t = tmp;
ac5ea531	167	t = uvuni_to_utf8(t, (lindex + Hangul_LBase));
ac5ea531	168	t = uvuni_to_utf8(t, (vindex + Hangul_VBase));
8f118dcd	169	if (tindex)
8f118dcd	170	t = uvuni_to_utf8(t, (tindex + Hangul_TBase));
ac5ea531	171	*t = '\0';
e524f5b2	172	sv_catpvn(sv, (char *)tmp, t - tmp);
	173	}
	174
	175	static void sv_cat_uvuni (SV* sv, UV uv)
	176	{
	177	U8 *t, tmp[UTF8_MAXLEN + 1];
	178
	179	t = tmp;
	180	t = uvuni_to_utf8(t, uv);
	181	*t = '\0';
	182	sv_catpvn(sv, (char *)tmp, t - tmp);
ac5ea531	183	}
ac5ea531	184
a092bcfd	185	static char * sv_2pvunicode(SV sv, STRLEN lp)
	186	{
	187	char *s;
	188	STRLEN len;
	189	s = (char*)SvPV(sv,len);
	190	if (!SvUTF8(sv)) {
	191	SV* tmpsv = sv_mortalcopy(sv);
	192	if (!SvPOK(tmpsv))
	193	(void)sv_pvn_force(tmpsv,&len);
	194	sv_utf8_upgrade(tmpsv);
	195	s = (char*)SvPV(tmpsv,len);
	196	}
	197	*lp = len;
	198	return s;
	199	}
	200
ac5ea531	201	MODULE = Unicode::Normalize PACKAGE = Unicode::Normalize
ac5ea531	202
ac5ea531	203	SV*
a092bcfd	204	decompose(src, compat = &PL_sv_no)
a092bcfd	205	SV * src
ac5ea531	206	SV * compat
d85850a7	207	PROTOTYPE: $;$
ac5ea531	208	PREINIT:
a092bcfd	209	SV *dst;
73263a9c	210	STRLEN srclen, retlen;
73263a9c	211	U8 s, e, p, r;
a092bcfd	212	UV uv;
ac5ea531	213	bool iscompat;
ac5ea531	214	CODE:
ac5ea531	215	iscompat = SvTRUE(compat);
a092bcfd	216	s = (U8*)sv_2pvunicode(src,&srclen);
a092bcfd	217	e = s + srclen;
ac5ea531	218
	219	dst = newSV(1);
	220	(void)SvPOK_only(dst);
	221	SvUTF8_on(dst);
	222
82e740b6	223	for (p = s; p < e; p += retlen) {
e524f5b2	224	uv = utf8n_to_uvuni(p, e - p, &retlen, AllowAnyUTF);
82e740b6	225	if (!retlen)
	226	croak(ErrRetlenIsZero);
	227
8f118dcd	228	if (Hangul_IsS(uv))
8f118dcd	229	sv_cat_decompHangul(dst, uv);
ac5ea531	230	else {
ac5ea531	231	r = iscompat ? dec_compat(uv) : dec_canonical(uv);
8f118dcd	232	if (r)
	233	sv_catpv(dst, (char *)r);
	234	else
e524f5b2	235	sv_cat_uvuni(dst, uv);
ac5ea531	236	}
	237	}
	238	RETVAL = dst;
	239	OUTPUT:
	240	RETVAL
	241
	242
	243
	244	SV*
a092bcfd	245	reorder(src)
a092bcfd	246	SV * src
ac5ea531	247	PROTOTYPE: $
ac5ea531	248	PREINIT:
a092bcfd	249	SV *dst;
8f118dcd	250	STRLEN srclen, dstlen, retlen, stk_cc_max;
8f118dcd	251	U8 s, e, p, d, curCC;
e524f5b2	252	UV uv, uvlast;
ac5ea531	253	UNF_cc * stk_cc;
e524f5b2	254	STRLEN i, cc_pos;
e524f5b2	255	bool valid_uvlast;
ac5ea531	256	CODE:
a092bcfd	257	s = (U8*)sv_2pvunicode(src,&srclen);
e524f5b2	258	e = s + srclen;
a092bcfd	259
8f118dcd	260	dstlen = srclen + 1;
8f118dcd	261	dst = newSV(dstlen);
e524f5b2	262	(void)SvPOK_only(dst);
8f118dcd	263	SvUTF8_on(dst);
e524f5b2	264	d = (U8*)SvPVX(dst);
ac5ea531	265
	266	stk_cc_max = 10; /* enough as an initial value? */
	267	New(0, stk_cc, stk_cc_max, UNF_cc);
	268
e524f5b2	269	for (p = s; p < e;) {
e524f5b2	270	uv = utf8n_to_uvuni(p, e - p, &retlen, AllowAnyUTF);
82e740b6	271	if (!retlen)
82e740b6	272	croak(ErrRetlenIsZero);
2a204b45	273	p += retlen;
2a204b45	274
82e740b6	275	curCC = getCombinClass(uv);
e524f5b2	276	if (curCC == 0) {
e524f5b2	277	d = uvuni_to_utf8(d, uv);
8f118dcd	278	continue;
e524f5b2	279	}
ac5ea531	280
2a204b45	281	cc_pos = 0;
ac5ea531	282	stk_cc[cc_pos].cc = curCC;
	283	stk_cc[cc_pos].uv = uv;
	284	stk_cc[cc_pos].pos = cc_pos;
	285
e524f5b2	286	valid_uvlast = FALSE;
8f118dcd	287	while (p < e) {
e524f5b2	288	uv = utf8n_to_uvuni(p, e - p, &retlen, AllowAnyUTF);
82e740b6	289	if (!retlen)
	290	croak(ErrRetlenIsZero);
	291	p += retlen;
	292
ac5ea531	293	curCC = getCombinClass(uv);
e524f5b2	294	if (curCC == 0) {
	295	uvlast = uv;
	296	valid_uvlast = TRUE;
8f118dcd	297	break;
e524f5b2	298	}
82e740b6	299
ac5ea531	300	cc_pos++;
8f118dcd	301	if (stk_cc_max <= cc_pos) { /* extend if need */
ac5ea531	302	stk_cc_max = cc_pos + 1;
	303	Renew(stk_cc, stk_cc_max, UNF_cc);
	304	}
	305	stk_cc[cc_pos].cc = curCC;
	306	stk_cc[cc_pos].uv = uv;
	307	stk_cc[cc_pos].pos = cc_pos;
	308	}
	309
e524f5b2	310	/* reordered if there are two c.c.'s */
	311	if (cc_pos) {
	312	qsort((void*)stk_cc, cc_pos + 1, sizeof(UNF_cc), compare_cc);
	313	}
ac5ea531	314
e524f5b2	315	for (i = 0; i <= cc_pos; i++) {
	316	d = uvuni_to_utf8(d, stk_cc[i].uv);
	317	}
	318	if (valid_uvlast)
	319	{
	320	d = uvuni_to_utf8(d, uvlast);
ac5ea531	321	}
ac5ea531	322	}
e524f5b2	323	*d = '\0';
e524f5b2	324	SvCUR_set(dst, d - (U8*)SvPVX(dst));
ac5ea531	325	Safefree(stk_cc);
8f118dcd	326	RETVAL = dst;
ac5ea531	327	OUTPUT:
	328	RETVAL
	329
	330
	331
2a204b45	332	SV*
a092bcfd	333	compose(src)
a092bcfd	334	SV * src
ac5ea531	335	PROTOTYPE: $
82e740b6	336	ALIAS:
82e740b6	337	composeContiguous = 1
ac5ea531	338	PREINIT:
a092bcfd	339	SV dst, tmp;
ac5ea531	340	U8 s, p, e, d, t, tmp_start, curCC, preCC;
ac5ea531	341	UV uv, uvS, uvComp;
2a204b45	342	STRLEN srclen, dstlen, tmplen, retlen;
ac5ea531	343	bool beginning = TRUE;
2a204b45	344	CODE:
a092bcfd	345	s = (U8*)sv_2pvunicode(src,&srclen);
ac5ea531	346	e = s + srclen;
a092bcfd	347
d85850a7	348	dstlen = srclen + 1;
2a204b45	349	dst = newSV(dstlen);
ac5ea531	350	(void)SvPOK_only(dst);
	351	SvUTF8_on(dst);
	352	d = (U8*)SvPVX(dst);
	353
	354	/* for uncomposed combining char */
	355	tmp = sv_2mortal(newSV(dstlen));
	356	(void)SvPOK_only(tmp);
	357	SvUTF8_on(tmp);
	358
8f118dcd	359	for (p = s; p < e;) {
8f118dcd	360	if (beginning) {
e524f5b2	361	uvS = utf8n_to_uvuni(p, e - p, &retlen, AllowAnyUTF);
82e740b6	362	if (!retlen)
82e740b6	363	croak(ErrRetlenIsZero);
ac5ea531	364	p += retlen;
ac5ea531	365
8f118dcd	366	if (getCombinClass(uvS)) { /* no Starter found yet */
ac5ea531	367	d = uvuni_to_utf8(d, uvS);
	368	continue;
	369	}
	370	beginning = FALSE;
	371	}
	372
	373	/* Starter */
	374	t = tmp_start = (U8*)SvPVX(tmp);
	375	preCC = 0;
	376
	377	/* to the next Starter */
8f118dcd	378	while (p < e) {
e524f5b2	379	uv = utf8n_to_uvuni(p, e - p, &retlen, AllowAnyUTF);
82e740b6	380	if (!retlen)
82e740b6	381	croak(ErrRetlenIsZero);
ac5ea531	382	p += retlen;
82e740b6	383
ac5ea531	384	curCC = getCombinClass(uv);
ac5ea531	385
8f118dcd	386	if (preCC && preCC == curCC) {
ac5ea531	387	preCC = curCC;
	388	t = uvuni_to_utf8(t, uv);
	389	} else {
2a204b45	390	uvComp = composite_uv(uvS, uv);
ac5ea531	391
82e740b6	392	if (uvComp && ! isExclusion(uvComp) &&
82e740b6	393	(ix ? (t == tmp_start) : (preCC <= curCC))) {
d85850a7	394	STRLEN leftcur, rightcur, dstcur;
	395	leftcur = UNISKIP(uvComp);
	396	rightcur = UNISKIP(uvS) + UNISKIP(uv);
	397
	398	if (leftcur > rightcur) {
	399	dstcur = d - (U8*)SvPVX(dst);
	400	dstlen += leftcur - rightcur;
	401	d = (U8*)SvGROW(dst,dstlen) + dstcur;
	402	}
ac5ea531	403	/* preCC not changed to curCC */
ac5ea531	404	uvS = uvComp;
1efaba7f	405	} else if (! curCC && p < e) { /* blocked */
ac5ea531	406	break;
	407	} else {
	408	preCC = curCC;
	409	t = uvuni_to_utf8(t, uv);
	410	}
	411	}
	412	}
2a204b45	413	d = uvuni_to_utf8(d, uvS); /* starter (composed or not) */
d85850a7	414	tmplen = t - tmp_start;
d85850a7	415	if (tmplen) { /* uncomposed combining char */
ac5ea531	416	t = (U8*)SvPVX(tmp);
8f118dcd	417	while (tmplen--)
8f118dcd	418	d++ = t++;
ac5ea531	419	}
	420	uvS = uv;
	421	} /* for */
00f2676f	422	*d = '\0';
d85850a7	423	SvCUR_set(dst, d - (U8*)SvPVX(dst));
2a204b45	424	RETVAL = dst;
	425	OUTPUT:
	426	RETVAL
ac5ea531	427
ac5ea531	428
8f118dcd	429	void
a092bcfd	430	checkNFD(src)
a092bcfd	431	SV * src
8f118dcd	432	PROTOTYPE: $
	433	ALIAS:
	434	checkNFKD = 1
	435	PREINIT:
8f118dcd	436	STRLEN srclen, retlen;
8f118dcd	437	U8 s, e, *p, curCC, preCC;
a092bcfd	438	UV uv;
82e740b6	439	CODE:
a092bcfd	440	s = (U8*)sv_2pvunicode(src,&srclen);
8f118dcd	441	e = s + srclen;
	442
	443	preCC = 0;
	444	for (p = s; p < e; p += retlen) {
e524f5b2	445	uv = utf8n_to_uvuni(p, e - p, &retlen, AllowAnyUTF);
82e740b6	446	if (!retlen)
	447	croak(ErrRetlenIsZero);
	448
8f118dcd	449	curCC = getCombinClass(uv);
	450	if (preCC > curCC && curCC != 0) /* canonical ordering violated */
	451	XSRETURN_NO;
	452	if (Hangul_IsS(uv) \|\| (ix ? dec_compat(uv) : dec_canonical(uv)))
	453	XSRETURN_NO;
	454	preCC = curCC;
	455	}
	456	XSRETURN_YES;
	457
	458
	459
	460	void
a092bcfd	461	checkNFC(src)
a092bcfd	462	SV * src
8f118dcd	463	PROTOTYPE: $
	464	ALIAS:
	465	checkNFKC = 1
	466	PREINIT:
8f118dcd	467	STRLEN srclen, retlen;
8f118dcd	468	U8 s, e, *p, curCC, preCC;
a092bcfd	469	UV uv;
8f118dcd	470	bool isMAYBE;
82e740b6	471	CODE:
a092bcfd	472	s = (U8*)sv_2pvunicode(src,&srclen);
8f118dcd	473	e = s + srclen;
	474
	475	preCC = 0;
	476	isMAYBE = FALSE;
	477	for (p = s; p < e; p += retlen) {
e524f5b2	478	uv = utf8n_to_uvuni(p, e - p, &retlen, AllowAnyUTF);
82e740b6	479	if (!retlen)
	480	croak(ErrRetlenIsZero);
	481
8f118dcd	482	curCC = getCombinClass(uv);
	483
	484	if (preCC > curCC && curCC != 0) /* canonical ordering violated */
	485	XSRETURN_NO;
	486
	487	/* get NFC/NFKC property */
	488	if (Hangul_IsS(uv)) /* Hangul syllables are canonical composites */
	489	; /* YES */
	490	else if (isExclusion(uv) \|\| isSingleton(uv) \|\| isNonStDecomp(uv))
	491	XSRETURN_NO;
	492	else if (isComp2nd(uv))
	493	isMAYBE = TRUE;
	494	else if (ix) {
	495	char canon, compat;
6c941e0c	496	/* NFKC_NO when having compatibility mapping. */
8f118dcd	497	canon = (char *) dec_canonical(uv);
8f118dcd	498	compat = (char *) dec_compat(uv);
6c941e0c	499	if (compat && !(canon && strEQ(canon, compat)))
8f118dcd	500	XSRETURN_NO;
	501	} /* end of get NFC/NFKC property */
	502
	503	preCC = curCC;
	504	}
	505	if (isMAYBE)
	506	XSRETURN_UNDEF;
	507	else
	508	XSRETURN_YES;
	509
	510
	511
82e740b6	512	void
a092bcfd	513	checkFCD(src)
a092bcfd	514	SV * src
82e740b6	515	PROTOTYPE: $
	516	ALIAS:
	517	checkFCC = 1
	518	PREINIT:
82e740b6	519	STRLEN srclen, retlen, canlen, canret;
82e740b6	520	U8 s, e, *p, curCC, preCC;
a092bcfd	521	UV uv, uvLead, uvTrail;
82e740b6	522	U8 sCan, pCan, *eCan;
	523	bool isMAYBE;
	524	CODE:
a092bcfd	525	s = (U8*)sv_2pvunicode(src,&srclen);
82e740b6	526	e = s + srclen;
	527
	528	preCC = 0;
	529	isMAYBE = FALSE;
	530	for (p = s; p < e; p += retlen) {
e524f5b2	531	uv = utf8n_to_uvuni(p, e - p, &retlen, AllowAnyUTF);
82e740b6	532	if (!retlen)
	533	croak(ErrRetlenIsZero);
	534
	535	sCan = (U8*) dec_canonical(uv);
	536
	537	if (sCan) {
	538	canlen = (STRLEN)strlen((char *) sCan);
e524f5b2	539	uvLead = utf8n_to_uvuni(sCan, canlen, &canret, AllowAnyUTF);
82e740b6	540	}
	541	else {
	542	uvLead = uv;
	543	}
	544
	545	curCC = getCombinClass(uvLead);
	546
	547	if (curCC != 0 && curCC < preCC) /* canonical ordering violated */
	548	XSRETURN_NO;
	549
	550	if (ix) {
	551	if (isExclusion(uv) \|\| isSingleton(uv) \|\| isNonStDecomp(uv))
	552	XSRETURN_NO;
	553	else if (isComp2nd(uv))
	554	isMAYBE = TRUE;
	555	}
	556
	557	if (sCan) {
	558	eCan = sCan + canlen;
	559	pCan = utf8_hop(eCan, -1);
	560	if (pCan < sCan)
	561	croak(ErrHopBeforeStart);
e524f5b2	562	uvTrail = utf8n_to_uvuni(pCan, eCan - pCan, &canret, AllowAnyUTF);
82e740b6	563	preCC = getCombinClass(uvTrail);
	564	}
	565	else {
	566	preCC = curCC;
	567	}
	568	}
	569	if (isMAYBE)
	570	XSRETURN_UNDEF;
	571	else
	572	XSRETURN_YES;
	573
	574
	575
ac5ea531	576	U8
	577	getCombinClass(uv)
	578	UV uv
8f118dcd	579	PROTOTYPE: $
ac5ea531	580
ac5ea531	581	bool
2a204b45	582	isExclusion(uv)
ac5ea531	583	UV uv
8f118dcd	584	PROTOTYPE: $
	585
	586	bool
	587	isSingleton(uv)
	588	UV uv
	589	PROTOTYPE: $
	590
	591	bool
	592	isNonStDecomp(uv)
	593	UV uv
	594	PROTOTYPE: $
	595
	596	bool
	597	isComp2nd(uv)
	598	UV uv
	599	PROTOTYPE: $
	600	ALIAS:
	601	isNFC_MAYBE = 1
	602	isNFKC_MAYBE = 2
	603
	604
	605
	606	void
	607	isNFD_NO(uv)
	608	UV uv
	609	PROTOTYPE: $
	610	ALIAS:
	611	isNFKD_NO = 1
82e740b6	612	CODE:
8f118dcd	613	if (Hangul_IsS(uv) \|\| (ix ? dec_compat(uv) : dec_canonical(uv)))
	614	XSRETURN_YES; /* NFD_NO or NFKD_NO */
	615	else
	616	XSRETURN_NO;
	617
	618
	619
	620	void
	621	isComp_Ex(uv)
	622	UV uv
	623	PROTOTYPE: $
	624	ALIAS:
	625	isNFC_NO = 0
	626	isNFKC_NO = 1
82e740b6	627	CODE:
8f118dcd	628	if (isExclusion(uv) \|\| isSingleton(uv) \|\| isNonStDecomp(uv))
	629	XSRETURN_YES; /* NFC_NO or NFKC_NO */
	630	else if (ix) {
	631	char canon, compat;
	632	canon = (char *) dec_canonical(uv);
	633	compat = (char *) dec_compat(uv);
	634	if (compat && (!canon \|\| strNE(canon, compat)))
	635	XSRETURN_YES; /* NFC_NO or NFKC_NO */
	636	else
	637	XSRETURN_NO;
	638	}
	639	else
	640	XSRETURN_NO;
	641
	642
ac5ea531	643
2a204b45	644	SV*
ac5ea531	645	getComposite(uv, uv2)
	646	UV uv
	647	UV uv2
2a204b45	648	PROTOTYPE: $$
2a204b45	649	PREINIT:
bcdb689b	650	UV composite;
2a204b45	651	CODE:
bcdb689b	652	composite = composite_uv(uv, uv2);
bcdb689b	653	RETVAL = composite ? newSVuv(composite) : &PL_sv_undef;
2a204b45	654	OUTPUT:
2a204b45	655	RETVAL
ac5ea531	656
8f118dcd	657
8f118dcd	658
ac5ea531	659	SV*
	660	getCanon(uv)
	661	UV uv
	662	PROTOTYPE: $
	663	ALIAS:
	664	getCompat = 1
	665	PREINIT:
	666	U8 * rstr;
	667	CODE:
8f118dcd	668	if (Hangul_IsS(uv)) {
ac5ea531	669	SV * dst;
	670	dst = newSV(1);
	671	(void)SvPOK_only(dst);
	672	sv_cat_decompHangul(dst, uv);
	673	RETVAL = dst;
	674	} else {
	675	rstr = ix ? dec_compat(uv) : dec_canonical(uv);
8f118dcd	676	if (!rstr)
8f118dcd	677	XSRETURN_UNDEF;
ac5ea531	678	RETVAL = newSVpvn((char )rstr, strlen((char )rstr));
	679	}
	680	SvUTF8_on(RETVAL);
	681	OUTPUT:
	682	RETVAL
	683
82e740b6	684
82e740b6	685	void
a092bcfd	686	splitOnLastStarter(src)
a092bcfd	687	SV * src
82e740b6	688	PREINIT:
a092bcfd	689	SV *svp;
82e740b6	690	STRLEN srclen, retlen;
82e740b6	691	U8 s, e, *p;
a092bcfd	692	UV uv;
82e740b6	693	PPCODE:
a092bcfd	694	s = (U8*)sv_2pvunicode(src,&srclen);
82e740b6	695	e = s + srclen;
	696
	697	for (p = e; s < p; ) {
	698	p = utf8_hop(p, -1);
	699	if (p < s)
	700	croak(ErrHopBeforeStart);
e524f5b2	701	uv = utf8n_to_uvuni(p, e - p, &retlen, AllowAnyUTF);
82e740b6	702	if (getCombinClass(uv) == 0) /* Last Starter found */
	703	break;
	704	}
	705
	706	svp = sv_2mortal(newSVpvn((char*)s, p - s));
	707	SvUTF8_on(svp);
	708	XPUSHs(svp);
	709
	710	svp = sv_2mortal(newSVpvn((char*)p, e - p));
	711	SvUTF8_on(svp);
	712	XPUSHs(svp);
	713