Commit | Line | Data |
eb1102fc |
1 | /* universal.c |
2 | * |
3 | * Copyright (c) 1997-2002, Larry Wall |
4 | * |
5 | * You may distribute under the terms of either the GNU General Public |
6 | * License or the Artistic License, as specified in the README file. |
7 | * |
8 | */ |
9 | |
6d4a7be2 |
10 | #include "EXTERN.h" |
864dbfa3 |
11 | #define PERL_IN_UNIVERSAL_C |
6d4a7be2 |
12 | #include "perl.h" |
6d4a7be2 |
13 | |
14 | /* |
15 | * Contributed by Graham Barr <Graham.Barr@tiuk.ti.com> |
16 | * The main guts of traverse_isa was actually copied from gv_fetchmeth |
17 | */ |
18 | |
76e3520e |
19 | STATIC SV * |
eb1102fc |
20 | S_isa_lookup(pTHX_ HV *stash, const char *name, HV* name_stash, |
21 | int len, int level) |
6d4a7be2 |
22 | { |
23 | AV* av; |
24 | GV* gv; |
25 | GV** gvp; |
26 | HV* hv = Nullhv; |
46e4b22b |
27 | SV* subgen = Nullsv; |
6d4a7be2 |
28 | |
eb1102fc |
29 | /* A stash/class can go by many names (ie. User == main::User), so |
30 | we compare the stash itself just in case */ |
31 | if (name_stash && (stash == name_stash)) |
32 | return &PL_sv_yes; |
6d4a7be2 |
33 | |
46e4b22b |
34 | if (strEQ(HvNAME(stash), name)) |
3280af22 |
35 | return &PL_sv_yes; |
6d4a7be2 |
36 | |
37 | if (level > 100) |
46e4b22b |
38 | Perl_croak(aTHX_ "Recursive inheritance detected in package '%s'", |
39 | HvNAME(stash)); |
6d4a7be2 |
40 | |
41 | gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, FALSE); |
42 | |
46e4b22b |
43 | if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (subgen = GvSV(gv)) |
44 | && (hv = GvHV(gv))) |
45 | { |
46 | if (SvIV(subgen) == PL_sub_generation) { |
47 | SV* sv; |
48 | SV** svp = (SV**)hv_fetch(hv, name, len, FALSE); |
49 | if (svp && (sv = *svp) != (SV*)&PL_sv_undef) { |
50 | DEBUG_o( Perl_deb(aTHX_ "Using cached ISA %s for package %s\n", |
51 | name, HvNAME(stash)) ); |
52 | return sv; |
53 | } |
54 | } |
55 | else { |
56 | DEBUG_o( Perl_deb(aTHX_ "ISA Cache in package %s is stale\n", |
57 | HvNAME(stash)) ); |
58 | hv_clear(hv); |
59 | sv_setiv(subgen, PL_sub_generation); |
60 | } |
6d4a7be2 |
61 | } |
62 | |
63 | gvp = (GV**)hv_fetch(stash,"ISA",3,FALSE); |
46e4b22b |
64 | |
3280af22 |
65 | if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) { |
46e4b22b |
66 | if (!hv || !subgen) { |
6d4a7be2 |
67 | gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, TRUE); |
68 | |
69 | gv = *gvp; |
70 | |
71 | if (SvTYPE(gv) != SVt_PVGV) |
72 | gv_init(gv, stash, "::ISA::CACHE::", 14, TRUE); |
73 | |
46e4b22b |
74 | if (!hv) |
75 | hv = GvHVn(gv); |
76 | if (!subgen) { |
77 | subgen = newSViv(PL_sub_generation); |
78 | GvSV(gv) = subgen; |
79 | } |
6d4a7be2 |
80 | } |
46e4b22b |
81 | if (hv) { |
6d4a7be2 |
82 | SV** svp = AvARRAY(av); |
93965878 |
83 | /* NOTE: No support for tied ISA */ |
84 | I32 items = AvFILLp(av) + 1; |
6d4a7be2 |
85 | while (items--) { |
86 | SV* sv = *svp++; |
87 | HV* basestash = gv_stashsv(sv, FALSE); |
88 | if (!basestash) { |
599cee73 |
89 | if (ckWARN(WARN_MISC)) |
cea2e8a9 |
90 | Perl_warner(aTHX_ WARN_SYNTAX, |
599cee73 |
91 | "Can't locate package %s for @%s::ISA", |
6d4a7be2 |
92 | SvPVX(sv), HvNAME(stash)); |
93 | continue; |
94 | } |
eb1102fc |
95 | if (&PL_sv_yes == isa_lookup(basestash, name, name_stash, |
96 | len, level + 1)) { |
3280af22 |
97 | (void)hv_store(hv,name,len,&PL_sv_yes,0); |
98 | return &PL_sv_yes; |
6d4a7be2 |
99 | } |
100 | } |
3280af22 |
101 | (void)hv_store(hv,name,len,&PL_sv_no,0); |
6d4a7be2 |
102 | } |
103 | } |
104 | |
e09f3e01 |
105 | return boolSV(strEQ(name, "UNIVERSAL")); |
6d4a7be2 |
106 | } |
107 | |
954c1994 |
108 | /* |
ccfc67b7 |
109 | =head1 SV Manipulation Functions |
110 | |
954c1994 |
111 | =for apidoc sv_derived_from |
112 | |
113 | Returns a boolean indicating whether the SV is derived from the specified |
114 | class. This is the function that implements C<UNIVERSAL::isa>. It works |
115 | for class names as well as for objects. |
116 | |
117 | =cut |
118 | */ |
119 | |
55497cff |
120 | bool |
864dbfa3 |
121 | Perl_sv_derived_from(pTHX_ SV *sv, const char *name) |
55497cff |
122 | { |
55497cff |
123 | char *type; |
124 | HV *stash; |
eb1102fc |
125 | HV *name_stash; |
46e4b22b |
126 | |
55497cff |
127 | stash = Nullhv; |
128 | type = Nullch; |
46e4b22b |
129 | |
55497cff |
130 | if (SvGMAGICAL(sv)) |
131 | mg_get(sv) ; |
132 | |
133 | if (SvROK(sv)) { |
134 | sv = SvRV(sv); |
135 | type = sv_reftype(sv,0); |
46e4b22b |
136 | if (SvOBJECT(sv)) |
55497cff |
137 | stash = SvSTASH(sv); |
138 | } |
139 | else { |
140 | stash = gv_stashsv(sv, FALSE); |
141 | } |
46e4b22b |
142 | |
eb1102fc |
143 | name_stash = gv_stashpv(name, FALSE); |
144 | |
55497cff |
145 | return (type && strEQ(type,name)) || |
eb1102fc |
146 | (stash && isa_lookup(stash, name, name_stash, strlen(name), 0) |
147 | == &PL_sv_yes) |
55497cff |
148 | ? TRUE |
149 | : FALSE ; |
55497cff |
150 | } |
151 | |
1b026014 |
152 | #include "XSUB.h" |
153 | |
acfe0abc |
154 | void XS_UNIVERSAL_isa(pTHX_ CV *cv); |
155 | void XS_UNIVERSAL_can(pTHX_ CV *cv); |
156 | void XS_UNIVERSAL_VERSION(pTHX_ CV *cv); |
1b026014 |
157 | XS(XS_utf8_valid); |
158 | XS(XS_utf8_encode); |
159 | XS(XS_utf8_decode); |
160 | XS(XS_utf8_upgrade); |
161 | XS(XS_utf8_downgrade); |
162 | XS(XS_utf8_unicode_to_native); |
163 | XS(XS_utf8_native_to_unicode); |
1b1f1335 |
164 | XS(XS_access_readonly); |
0cb96387 |
165 | |
166 | void |
167 | Perl_boot_core_UNIVERSAL(pTHX) |
168 | { |
169 | char *file = __FILE__; |
170 | |
171 | newXS("UNIVERSAL::isa", XS_UNIVERSAL_isa, file); |
172 | newXS("UNIVERSAL::can", XS_UNIVERSAL_can, file); |
173 | newXS("UNIVERSAL::VERSION", XS_UNIVERSAL_VERSION, file); |
1b026014 |
174 | newXS("utf8::valid", XS_utf8_valid, file); |
175 | newXS("utf8::encode", XS_utf8_encode, file); |
176 | newXS("utf8::decode", XS_utf8_decode, file); |
177 | newXS("utf8::upgrade", XS_utf8_upgrade, file); |
178 | newXS("utf8::downgrade", XS_utf8_downgrade, file); |
179 | newXS("utf8::native_to_unicode", XS_utf8_native_to_unicode, file); |
180 | newXS("utf8::unicode_to_native", XS_utf8_unicode_to_native, file); |
1b1f1335 |
181 | newXSproto("access::readonly",XS_access_readonly, file, "\\[$%@];$"); |
0cb96387 |
182 | } |
183 | |
55497cff |
184 | |
6d4a7be2 |
185 | XS(XS_UNIVERSAL_isa) |
186 | { |
187 | dXSARGS; |
55497cff |
188 | SV *sv; |
189 | char *name; |
2d8e6c8d |
190 | STRLEN n_a; |
6d4a7be2 |
191 | |
192 | if (items != 2) |
cea2e8a9 |
193 | Perl_croak(aTHX_ "Usage: UNIVERSAL::isa(reference, kind)"); |
6d4a7be2 |
194 | |
195 | sv = ST(0); |
f8f70380 |
196 | |
d3f7f2b2 |
197 | if (SvGMAGICAL(sv)) |
198 | mg_get(sv); |
199 | |
aca069ec |
200 | if (!SvOK(sv) || !(SvROK(sv) || (SvPOK(sv) && SvCUR(sv)))) |
f8f70380 |
201 | XSRETURN_UNDEF; |
202 | |
2d8e6c8d |
203 | name = (char *)SvPV(ST(1),n_a); |
6d4a7be2 |
204 | |
54310121 |
205 | ST(0) = boolSV(sv_derived_from(sv, name)); |
6d4a7be2 |
206 | XSRETURN(1); |
207 | } |
208 | |
6d4a7be2 |
209 | XS(XS_UNIVERSAL_can) |
210 | { |
211 | dXSARGS; |
212 | SV *sv; |
213 | char *name; |
214 | SV *rv; |
6f08146e |
215 | HV *pkg = NULL; |
2d8e6c8d |
216 | STRLEN n_a; |
6d4a7be2 |
217 | |
218 | if (items != 2) |
cea2e8a9 |
219 | Perl_croak(aTHX_ "Usage: UNIVERSAL::can(object-ref, method)"); |
6d4a7be2 |
220 | |
221 | sv = ST(0); |
f8f70380 |
222 | |
d3f7f2b2 |
223 | if (SvGMAGICAL(sv)) |
224 | mg_get(sv); |
225 | |
aca069ec |
226 | if (!SvOK(sv) || !(SvROK(sv) || (SvPOK(sv) && SvCUR(sv)))) |
f8f70380 |
227 | XSRETURN_UNDEF; |
228 | |
2d8e6c8d |
229 | name = (char *)SvPV(ST(1),n_a); |
3280af22 |
230 | rv = &PL_sv_undef; |
6d4a7be2 |
231 | |
46e4b22b |
232 | if (SvROK(sv)) { |
6f08146e |
233 | sv = (SV*)SvRV(sv); |
46e4b22b |
234 | if (SvOBJECT(sv)) |
6f08146e |
235 | pkg = SvSTASH(sv); |
236 | } |
237 | else { |
238 | pkg = gv_stashsv(sv, FALSE); |
239 | } |
240 | |
241 | if (pkg) { |
dc848c6f |
242 | GV *gv = gv_fetchmethod_autoload(pkg, name, FALSE); |
243 | if (gv && isGV(gv)) |
244 | rv = sv_2mortal(newRV((SV*)GvCV(gv))); |
6d4a7be2 |
245 | } |
246 | |
247 | ST(0) = rv; |
248 | XSRETURN(1); |
249 | } |
250 | |
6d4a7be2 |
251 | XS(XS_UNIVERSAL_VERSION) |
252 | { |
253 | dXSARGS; |
254 | HV *pkg; |
255 | GV **gvp; |
256 | GV *gv; |
257 | SV *sv; |
258 | char *undef; |
259 | |
1571675a |
260 | if (SvROK(ST(0))) { |
6d4a7be2 |
261 | sv = (SV*)SvRV(ST(0)); |
1571675a |
262 | if (!SvOBJECT(sv)) |
cea2e8a9 |
263 | Perl_croak(aTHX_ "Cannot find version of an unblessed reference"); |
6d4a7be2 |
264 | pkg = SvSTASH(sv); |
265 | } |
266 | else { |
267 | pkg = gv_stashsv(ST(0), FALSE); |
268 | } |
269 | |
270 | gvp = pkg ? (GV**)hv_fetch(pkg,"VERSION",7,FALSE) : Null(GV**); |
271 | |
d4bea2fb |
272 | if (gvp && isGV(gv = *gvp) && SvOK(sv = GvSV(gv))) { |
6d4a7be2 |
273 | SV *nsv = sv_newmortal(); |
274 | sv_setsv(nsv, sv); |
275 | sv = nsv; |
276 | undef = Nullch; |
277 | } |
278 | else { |
3280af22 |
279 | sv = (SV*)&PL_sv_undef; |
6d4a7be2 |
280 | undef = "(undef)"; |
281 | } |
282 | |
1571675a |
283 | if (items > 1) { |
284 | STRLEN len; |
285 | SV *req = ST(1); |
286 | |
287 | if (undef) |
288 | Perl_croak(aTHX_ "%s does not define $%s::VERSION--version check failed", |
289 | HvNAME(pkg), HvNAME(pkg)); |
290 | |
291 | if (!SvNIOK(sv) && SvPOK(sv)) { |
292 | char *str = SvPVx(sv,len); |
293 | while (len) { |
294 | --len; |
295 | /* XXX could DWIM "1.2.3" here */ |
296 | if (!isDIGIT(str[len]) && str[len] != '.' && str[len] != '_') |
297 | break; |
298 | } |
299 | if (len) { |
4305d8ab |
300 | if (SvNOK(req) && SvPOK(req)) { |
1571675a |
301 | /* they said C<use Foo v1.2.3> and $Foo::VERSION |
302 | * doesn't look like a float: do string compare */ |
303 | if (sv_cmp(req,sv) == 1) { |
d2560b70 |
304 | Perl_croak(aTHX_ "%s v%"VDf" required--" |
305 | "this is only v%"VDf, |
1571675a |
306 | HvNAME(pkg), req, sv); |
307 | } |
308 | goto finish; |
309 | } |
310 | /* they said C<use Foo 1.002_003> and $Foo::VERSION |
311 | * doesn't look like a float: force numeric compare */ |
155aba94 |
312 | (void)SvUPGRADE(sv, SVt_PVNV); |
1571675a |
313 | SvNVX(sv) = str_to_version(sv); |
314 | SvPOK_off(sv); |
315 | SvNOK_on(sv); |
316 | } |
317 | } |
318 | /* if we get here, we're looking for a numeric comparison, |
319 | * so force the required version into a float, even if they |
320 | * said C<use Foo v1.2.3> */ |
4305d8ab |
321 | if (SvNOK(req) && SvPOK(req)) { |
1571675a |
322 | NV n = SvNV(req); |
323 | req = sv_newmortal(); |
324 | sv_setnv(req, n); |
325 | } |
326 | |
f6eb1a96 |
327 | if (SvNV(req) > SvNV(sv)) |
1571675a |
328 | Perl_croak(aTHX_ "%s version %s required--this is only version %s", |
f6eb1a96 |
329 | HvNAME(pkg), SvPV_nolen(req), SvPV_nolen(sv)); |
2d8e6c8d |
330 | } |
6d4a7be2 |
331 | |
1571675a |
332 | finish: |
6d4a7be2 |
333 | ST(0) = sv; |
334 | |
335 | XSRETURN(1); |
336 | } |
337 | |
1b026014 |
338 | XS(XS_utf8_valid) |
339 | { |
340 | dXSARGS; |
341 | if (items != 1) |
342 | Perl_croak(aTHX_ "Usage: utf8::valid(sv)"); |
343 | { |
344 | SV * sv = ST(0); |
345 | { |
346 | STRLEN len; |
347 | char *s = SvPV(sv,len); |
348 | if (!SvUTF8(sv) || is_utf8_string((U8*)s,len)) |
349 | XSRETURN_YES; |
350 | else |
351 | XSRETURN_NO; |
352 | } |
353 | } |
354 | XSRETURN_EMPTY; |
355 | } |
356 | |
357 | XS(XS_utf8_encode) |
358 | { |
359 | dXSARGS; |
360 | if (items != 1) |
361 | Perl_croak(aTHX_ "Usage: utf8::encode(sv)"); |
362 | { |
363 | SV * sv = ST(0); |
364 | |
365 | sv_utf8_encode(sv); |
366 | } |
367 | XSRETURN_EMPTY; |
368 | } |
369 | |
370 | XS(XS_utf8_decode) |
371 | { |
372 | dXSARGS; |
373 | if (items != 1) |
374 | Perl_croak(aTHX_ "Usage: utf8::decode(sv)"); |
375 | { |
376 | SV * sv = ST(0); |
377 | bool RETVAL; |
378 | |
379 | RETVAL = sv_utf8_decode(sv); |
380 | ST(0) = boolSV(RETVAL); |
381 | sv_2mortal(ST(0)); |
382 | } |
383 | XSRETURN(1); |
384 | } |
385 | |
386 | XS(XS_utf8_upgrade) |
387 | { |
388 | dXSARGS; |
389 | if (items != 1) |
390 | Perl_croak(aTHX_ "Usage: utf8::upgrade(sv)"); |
391 | { |
392 | SV * sv = ST(0); |
393 | STRLEN RETVAL; |
394 | dXSTARG; |
395 | |
396 | RETVAL = sv_utf8_upgrade(sv); |
397 | XSprePUSH; PUSHi((IV)RETVAL); |
398 | } |
399 | XSRETURN(1); |
400 | } |
401 | |
402 | XS(XS_utf8_downgrade) |
403 | { |
404 | dXSARGS; |
405 | if (items < 1 || items > 2) |
406 | Perl_croak(aTHX_ "Usage: utf8::downgrade(sv, failok=0)"); |
407 | { |
408 | SV * sv = ST(0); |
409 | bool failok; |
410 | bool RETVAL; |
411 | |
412 | if (items < 2) |
413 | failok = 0; |
414 | else { |
415 | failok = (int)SvIV(ST(1)); |
416 | } |
417 | |
418 | RETVAL = sv_utf8_downgrade(sv, failok); |
419 | ST(0) = boolSV(RETVAL); |
420 | sv_2mortal(ST(0)); |
421 | } |
422 | XSRETURN(1); |
423 | } |
424 | |
425 | XS(XS_utf8_native_to_unicode) |
426 | { |
427 | dXSARGS; |
428 | UV uv = SvUV(ST(0)); |
b7953727 |
429 | |
430 | if (items > 1) |
431 | Perl_croak(aTHX_ "Usage: utf8::native_to_unicode(sv)"); |
432 | |
1b026014 |
433 | ST(0) = sv_2mortal(newSViv(NATIVE_TO_UNI(uv))); |
434 | XSRETURN(1); |
435 | } |
436 | |
437 | XS(XS_utf8_unicode_to_native) |
438 | { |
439 | dXSARGS; |
440 | UV uv = SvUV(ST(0)); |
b7953727 |
441 | |
442 | if (items > 1) |
443 | Perl_croak(aTHX_ "Usage: utf8::unicode_to_native(sv)"); |
444 | |
1b026014 |
445 | ST(0) = sv_2mortal(newSViv(UNI_TO_NATIVE(uv))); |
446 | XSRETURN(1); |
447 | } |
448 | |
1b1f1335 |
449 | XS(XS_access_readonly) |
450 | { |
451 | dXSARGS; |
452 | SV *sv = SvRV(ST(0)); |
453 | IV old = SvREADONLY(sv); |
454 | if (items == 2) { |
455 | if (SvTRUE(ST(1))) { |
456 | SvREADONLY_on(sv); |
457 | } |
458 | else { |
459 | SvREADONLY_off(sv); |
460 | } |
461 | } |
462 | if (old) |
463 | XSRETURN_YES; |
464 | else |
465 | XSRETURN_NO; |
466 | } |
1b026014 |
467 | |