diff options
Diffstat (limited to 'utf8.c')
| -rw-r--r-- | utf8.c | 638 |
1 files changed, 638 insertions, 0 deletions
diff --git a/utf8.c b/utf8.c new file mode 100644 index 0000000000..5796534834 --- /dev/null +++ b/utf8.c @@ -0,0 +1,638 @@ +/* utf8.c + * + * Copyright (c) 1998, Larry Wall + * + * You may distribute under the terms of either the GNU General Public + * License or the Artistic License, as specified in the README file. + * + */ + +/* + * 'What a fix!' said Sam. 'That's the one place in all the lands we've ever + * heard of that we don't want to see any closer; and that's the one place + * we're trying to get to! And that's just where we can't get, nohow.' + * + * 'Well do I understand your speech,' he answered in the same language; + * 'yet few strangers do so. Why then do you not speak in the Common Tongue, + * as is the custom in the West, if you wish to be answered?' + * + * ...the travellers perceived that the floor was paved with stones of many + * hues; branching runes and strange devices intertwined beneath their feet. + */ + +#include "EXTERN.h" +#include "perl.h" + +/* Unicode support */ + +char * +uv_to_utf8(unsigned char *d, UV uv) +{ + if (uv < 0x80) { + *d++ = uv; + return d; + } + if (uv < 0x800) { + *d++ = (( uv >> 6) | 0xc0); + *d++ = (( uv & 0x3f) | 0x80); + return d; + } + if (uv < 0x10000) { + *d++ = (( uv >> 12) | 0xe0); + *d++ = (((uv >> 6) & 0x3f) | 0x80); + *d++ = (( uv & 0x3f) | 0x80); + return d; + } + if (uv < 0x200000) { + *d++ = (( uv >> 18) | 0xf0); + *d++ = (((uv >> 12) & 0x3f) | 0x80); + *d++ = (((uv >> 6) & 0x3f) | 0x80); + *d++ = (( uv & 0x3f) | 0x80); + return d; + } + if (uv < 0x4000000) { + *d++ = (( uv >> 24) | 0xf8); + *d++ = (((uv >> 18) & 0x3f) | 0x80); + *d++ = (((uv >> 12) & 0x3f) | 0x80); + *d++ = (((uv >> 6) & 0x3f) | 0x80); + *d++ = (( uv & 0x3f) | 0x80); + return d; + } + if (uv < 0x80000000) { + *d++ = (( uv >> 30) | 0xfc); + *d++ = (((uv >> 24) & 0x3f) | 0x80); + *d++ = (((uv >> 18) & 0x3f) | 0x80); + *d++ = (((uv >> 12) & 0x3f) | 0x80); + *d++ = (((uv >> 6) & 0x3f) | 0x80); + *d++ = (( uv & 0x3f) | 0x80); + return d; + } +#ifdef Quad_t + if (uv < 0x2000000000) +#endif + { + *d++ = 0xfe; /* Can't match U+FEFF! */ + *d++ = (((uv >> 30) & 0x3f) | 0x80); + *d++ = (((uv >> 24) & 0x3f) | 0x80); + *d++ = (((uv >> 18) & 0x3f) | 0x80); + *d++ = (((uv >> 12) & 0x3f) | 0x80); + *d++ = (((uv >> 6) & 0x3f) | 0x80); + *d++ = (( uv & 0x3f) | 0x80); + return d; + } +#ifdef Quad_t + { + *d++ = 0xff; /* Can't match U+FFFE! */ + *d++ = (((uv >> 36) & 0x3f) | 0x80); + *d++ = (((uv >> 30) & 0x3f) | 0x80); + *d++ = (((uv >> 24) & 0x3f) | 0x80); + *d++ = (((uv >> 18) & 0x3f) | 0x80); + *d++ = (((uv >> 12) & 0x3f) | 0x80); + *d++ = (((uv >> 6) & 0x3f) | 0x80); + *d++ = (( uv & 0x3f) | 0x80); + return d; + } +#endif +} + +UV +utf8_to_uv(unsigned char* s, I32* retlen) +{ + UV uv = *s; + int len; + if (!(uv & 0x80)) { + if (retlen) + *retlen = 1; + return *s; + } + if (!(uv & 0x40)) { + warn("Malformed UTF-8 character"); + if (retlen) + *retlen = 1; + return *s; + } + + if (!(uv & 0x20)) { len = 2; uv &= 0x1f; } + else if (!(uv & 0x10)) { len = 3; uv &= 0x0f; } + else if (!(uv & 0x08)) { len = 4; uv &= 0x07; } + else if (!(uv & 0x04)) { len = 5; uv &= 0x03; } + else if (!(uv & 0x02)) { len = 6; uv &= 0x01; } + else if (!(uv & 0x01)) { len = 7; uv &= 0x00; } + else len = 8; /* whoa! */ + + if (retlen) + *retlen = len; + --len; + s++; + while (len--) { + if ((*s & 0xc0) != 0x80) { + warn("Malformed UTF-8 character"); + if (retlen) + *retlen -= len + 1; + return 0xfffd; + } + else + uv = (uv << 6) | (*s++ & 0x3f); + } + return uv; +} + +/* utf8_distance(a,b) is intended to be a - b in pointer arithmetic */ + +I32 +utf8_distance(unsigned char *a, unsigned char *b) +{ + I32 off = 0; + if (a < b) { + while (a < b) { + a += UTF8SKIP(a); + off--; + } + } + else { + while (b < a) { + b += UTF8SKIP(b); + off++; + } + } + return off; +} + +/* WARNING: do not use the following unless you *know* off is within bounds */ + +U8 * +utf8_hop(unsigned char *s, I32 off) +{ + if (off >= 0) { + while (off--) + s += UTF8SKIP(s); + } + else { + while (off++) { + s--; + if (*s & 0x80) { + while ((*s & 0xc0) == 0x80) + s--; + } + } + } + return s; +} + +/* XXX NOTHING CALLS THE FOLLOWING TWO ROUTINES YET!!! */ +/* + * Convert native or reversed UTF-16 to UTF-8. + * + * Destination must be pre-extended to 3/2 source. Do not use in-place. + * We optimize for native, for obvious reasons. */ + +U8* +utf16_to_utf8(U16* p, U8* d, I32 bytelen) +{ + U16* pend = p + bytelen / 2; + while (p < pend) { + UV uv = *p++; + if (uv < 0x80) { + *d++ = uv; + continue; + } + if (uv < 0x800) { + *d++ = (( uv >> 6) | 0xc0); + *d++ = (( uv & 0x3f) | 0x80); + continue; + } + if (uv >= 0xd800 && uv < 0xdbff) { /* surrogates */ + int low = *p++; + if (low < 0xdc00 || low >= 0xdfff) { + warn("Malformed UTF-16 surrogate"); + p--; + uv = 0xfffd; + } + uv = ((uv - 0xd800) << 10) + (low - 0xdc00) + 0x10000; + } + if (uv < 0x10000) { + *d++ = (( uv >> 12) | 0xe0); + *d++ = (((uv >> 6) & 0x3f) | 0x80); + *d++ = (( uv & 0x3f) | 0x80); + continue; + } + else { + *d++ = (( uv >> 18) | 0xf0); + *d++ = (((uv >> 12) & 0x3f) | 0x80); + *d++ = (((uv >> 6) & 0x3f) | 0x80); + *d++ = (( uv & 0x3f) | 0x80); + continue; + } + } + return d; +} + +/* Note: this one is slightly destructive of the source. */ + +U8* +utf16_to_utf8_reversed(U16* p, U8* d, I32 bytelen) +{ + U8* s = (U8*)p; + U8* send = s + bytelen; + while (s < send) { + U8 tmp = s[0]; + s[0] = s[1]; + s[1] = tmp; + s += 2; + } + return utf16_to_utf8(p, d, bytelen); +} + +/* for now these are all defined (inefficiently) in terms of the utf8 versions */ + +bool +is_uni_alnum(U32 c) +{ + char tmpbuf[10]; + uv_to_utf8(tmpbuf, (UV)c); + return is_utf8_alnum(tmpbuf); +} + +bool +is_uni_idfirst(U32 c) +{ + char tmpbuf[10]; + uv_to_utf8(tmpbuf, (UV)c); + return is_utf8_idfirst(tmpbuf); +} + +bool +is_uni_alpha(U32 c) +{ + char tmpbuf[10]; + uv_to_utf8(tmpbuf, (UV)c); + return is_utf8_alpha(tmpbuf); +} + +bool +is_uni_space(U32 c) +{ + char tmpbuf[10]; + uv_to_utf8(tmpbuf, (UV)c); + return is_utf8_space(tmpbuf); +} + +bool +is_uni_digit(U32 c) +{ + char tmpbuf[10]; + uv_to_utf8(tmpbuf, (UV)c); + return is_utf8_digit(tmpbuf); +} + +bool +is_uni_upper(U32 c) +{ + char tmpbuf[10]; + uv_to_utf8(tmpbuf, (UV)c); + return is_utf8_upper(tmpbuf); +} + +bool +is_uni_lower(U32 c) +{ + char tmpbuf[10]; + uv_to_utf8(tmpbuf, (UV)c); + return is_utf8_lower(tmpbuf); +} + +bool +is_uni_print(U32 c) +{ + char tmpbuf[10]; + uv_to_utf8(tmpbuf, (UV)c); + return is_utf8_print(tmpbuf); +} + +U32 +to_uni_upper(U32 c) +{ + char tmpbuf[10]; + uv_to_utf8(tmpbuf, (UV)c); + return to_utf8_upper(tmpbuf); +} + +U32 +to_uni_title(U32 c) +{ + char tmpbuf[10]; + uv_to_utf8(tmpbuf, (UV)c); + return to_utf8_title(tmpbuf); +} + +U32 +to_uni_lower(U32 c) +{ + char tmpbuf[10]; + uv_to_utf8(tmpbuf, (UV)c); + return to_utf8_lower(tmpbuf); +} + +/* for now these all assume no locale info available for Unicode > 255 */ + +bool +is_uni_alnum_lc(U32 c) +{ + return is_uni_alnum(c); /* XXX no locale support yet */ +} + +bool +is_uni_idfirst_lc(U32 c) +{ + return is_uni_idfirst(c); /* XXX no locale support yet */ +} + +bool +is_uni_alpha_lc(U32 c) +{ + return is_uni_alpha(c); /* XXX no locale support yet */ +} + +bool +is_uni_space_lc(U32 c) +{ + return is_uni_space(c); /* XXX no locale support yet */ +} + +bool +is_uni_digit_lc(U32 c) +{ + return is_uni_digit(c); /* XXX no locale support yet */ +} + +bool +is_uni_upper_lc(U32 c) +{ + return is_uni_upper(c); /* XXX no locale support yet */ +} + +bool +is_uni_lower_lc(U32 c) +{ + return is_uni_lower(c); /* XXX no locale support yet */ +} + +bool +is_uni_print_lc(U32 c) +{ + return is_uni_print(c); /* XXX no locale support yet */ +} + +U32 +to_uni_upper_lc(U32 c) +{ + return to_uni_upper(c); /* XXX no locale support yet */ +} + +U32 +to_uni_title_lc(U32 c) +{ + return to_uni_title(c); /* XXX no locale support yet */ +} + +U32 +to_uni_lower_lc(U32 c) +{ + return to_uni_lower(c); /* XXX no locale support yet */ +} + + +bool +is_utf8_alnum(unsigned char *p) +{ + if (!PL_utf8_alnum) + PL_utf8_alnum = swash_init("utf8", "IsAlnum", &sv_undef, 0, 0); + return swash_fetch(PL_utf8_alnum, p); +/* return *p == '_' || is_utf8_alpha(p) || is_utf8_digit(p); */ +#ifdef SURPRISINGLY_SLOWER /* probably because alpha is usually true */ + if (!PL_utf8_alnum) + PL_utf8_alnum = swash_init("utf8", "", + sv_2mortal(newSVpv("+utf8::IsAlpha\n+utf8::IsDigit\n005F\n",0)), 0, 0); + return swash_fetch(PL_utf8_alnum, p); +#endif +} + +bool +is_utf8_idfirst(unsigned char *p) +{ + return *p == '_' || is_utf8_alpha(p); +} + +bool +is_utf8_alpha(unsigned char *p) +{ + if (!PL_utf8_alpha) + PL_utf8_alpha = swash_init("utf8", "IsAlpha", &sv_undef, 0, 0); + return swash_fetch(PL_utf8_alpha, p); +} + +bool +is_utf8_space(unsigned char *p) +{ + if (!PL_utf8_space) + PL_utf8_space = swash_init("utf8", "IsSpace", &sv_undef, 0, 0); + return swash_fetch(PL_utf8_space, p); +} + +bool +is_utf8_digit(unsigned char *p) +{ + if (!PL_utf8_digit) + PL_utf8_digit = swash_init("utf8", "IsDigit", &sv_undef, 0, 0); + return swash_fetch(PL_utf8_digit, p); +} + +bool +is_utf8_upper(unsigned char *p) +{ + if (!PL_utf8_upper) + PL_utf8_upper = swash_init("utf8", "IsUpper", &sv_undef, 0, 0); + return swash_fetch(PL_utf8_upper, p); +} + +bool +is_utf8_lower(unsigned char *p) +{ + if (!PL_utf8_lower) + PL_utf8_lower = swash_init("utf8", "IsLower", &sv_undef, 0, 0); + return swash_fetch(PL_utf8_lower, p); +} + +bool +is_utf8_print(unsigned char *p) +{ + if (!PL_utf8_print) + PL_utf8_print = swash_init("utf8", "IsPrint", &sv_undef, 0, 0); + return swash_fetch(PL_utf8_print, p); +} + +bool +is_utf8_mark(unsigned char *p) +{ + if (!PL_utf8_mark) + PL_utf8_mark = swash_init("utf8", "IsM", &sv_undef, 0, 0); + return swash_fetch(PL_utf8_mark, p); +} + +U32 +to_utf8_upper(unsigned char *p) +{ + UV uv; + + if (!PL_utf8_toupper) + PL_utf8_toupper = swash_init("utf8", "ToUpper", &sv_undef, 4, 0); + uv = swash_fetch(PL_utf8_toupper, p); + return uv ? uv : utf8_to_uv(p,0); +} + +U32 +to_utf8_title(unsigned char *p) +{ + UV uv; + + if (!PL_utf8_totitle) + PL_utf8_totitle = swash_init("utf8", "ToTitle", &sv_undef, 4, 0); + uv = swash_fetch(PL_utf8_totitle, p); + return uv ? uv : utf8_to_uv(p,0); +} + +U32 +to_utf8_lower(unsigned char *p) +{ + UV uv; + + if (!PL_utf8_tolower) + PL_utf8_tolower = swash_init("utf8", "ToLower", &sv_undef, 4, 0); + uv = swash_fetch(PL_utf8_tolower, p); + return uv ? uv : utf8_to_uv(p,0); +} + +/* a "swash" is a swatch hash */ + +SV* +swash_init(char* pkg, char* name, SV *listsv, I32 minbits, I32 none) +{ + SV* retval; + char tmpbuf[256]; + dSP; + PUSHSTACKi(PERLSI_MAGIC); + PUSHMARK(SP); + EXTEND(SP,5); + PUSHs(sv_2mortal(newSVpvn(pkg, strlen(pkg)))); + PUSHs(sv_2mortal(newSVpvn(name, strlen(name)))); + PUSHs(listsv); + PUSHs(sv_2mortal(newSViv(minbits))); + PUSHs(sv_2mortal(newSViv(none))); + PUTBACK; + ENTER; + SAVEI32(PL_hints); + PL_hints = 0; + save_re_context(); + if (curcop == &compiling) /* XXX ought to be handled by lex_start */ + strncpy(tmpbuf, PL_tokenbuf, sizeof tmpbuf); + if (perl_call_method("SWASHNEW", G_SCALAR)) + retval = newSVsv(*stack_sp--); + else + retval = &sv_undef; + LEAVE; + POPSTACK; + if (curcop == &compiling) { + strncpy(PL_tokenbuf, tmpbuf, sizeof tmpbuf); + curcop->op_private = PL_hints; + } + if (!SvROK(retval) || SvTYPE(SvRV(retval)) != SVt_PVHV) + croak("SWASHNEW didn't return an HV ref"); + return retval; +} + +UV +swash_fetch(SV *sv, unsigned char *ptr) +{ + HV* hv = (HV*)SvRV(sv); + U32 klen = UTF8SKIP(ptr) - 1; + U32 off = ptr[klen] & 127; /* NB: 64 bit always 0 when len > 1 */ + STRLEN slen; + STRLEN needents = (klen ? 64 : 128); + unsigned char *tmps; + U32 bit; + SV *retval; + + /* + * This single-entry cache saves about 1/3 of the utf8 overhead in test + * suite. (That is, only 7-8% overall over just a hash cache. Still, + * it's nothing to sniff at.) Pity we usually come through at least + * two function calls to get here... + * + * NB: this code assumes that swatches are never modified, once generated! + */ + + if (hv == PL_last_swash_hv && + klen == PL_last_swash_klen && + (!klen || memEQ(ptr,PL_last_swash_key,klen)) ) + { + tmps = PL_last_swash_tmps; + slen = PL_last_swash_slen; + } + else { + /* Try our second-level swatch cache, kept in a hash. */ + SV** svp = hv_fetch(hv, ptr, klen, FALSE); + + /* If not cached, generate it via utf8::SWASHGET */ + if (!svp || !SvPOK(*svp) || !(tmps = SvPV(*svp, slen))) { + dSP; + ENTER; + SAVETMPS; + save_re_context(); + PUSHSTACKi(PERLSI_MAGIC); + PUSHMARK(SP); + EXTEND(SP,3); + PUSHs((SV*)sv); + PUSHs(sv_2mortal(newSViv(utf8_to_uv(ptr, 0) & ~(needents - 1)))); + PUSHs(sv_2mortal(newSViv(needents))); + PUTBACK; + if (perl_call_method("SWASHGET", G_SCALAR)) + retval = newSVsv(*stack_sp--); + else + retval = &sv_undef; + POPSTACK; + FREETMPS; + LEAVE; + if (curcop == &compiling) + curcop->op_private = PL_hints; + + svp = hv_store(hv, ptr, klen, retval, 0); + + if (!svp || !(tmps = SvPV(*svp, slen)) || slen < 8) + croak("SWASHGET didn't return result of proper length"); + } + + PL_last_swash_hv = hv; + PL_last_swash_klen = klen; + PL_last_swash_tmps = tmps; + PL_last_swash_slen = slen; + if (klen) + Copy(ptr, PL_last_swash_key, klen, U8); + } + + switch ((slen << 3) / needents) { + case 1: + bit = 1 << (off & 7); + off >>= 3; + return (tmps[off] & bit) != 0; + case 8: + return tmps[off]; + case 16: + off <<= 1; + return (tmps[off] << 8) + tmps[off + 1] ; + case 32: + off <<= 2; + return (tmps[off] << 24) + (tmps[off+1] << 16) + (tmps[off+2] << 8) + tmps[off + 3] ; + } + croak("panic: swash_fetch"); + return 0; +} |