Commit | Line | Data |
d6376244 |
1 | /* xsutils.c |
2 | * |
1129b882 |
3 | * Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 |
371fce9b |
4 | * by Larry Wall and others |
d6376244 |
5 | * |
6 | * You may distribute under the terms of either the GNU General Public |
7 | * License or the Artistic License, as specified in the README file. |
8 | * |
9 | */ |
10 | |
d31a8517 |
11 | /* |
4ac71550 |
12 | * 'Perilous to us all are the devices of an art deeper than we possess |
13 | * ourselves.' --Gandalf |
14 | * |
15 | * [p.597 of _The Lord of the Rings_, III/xi: "The PalantÃr"] |
d31a8517 |
16 | */ |
17 | |
18 | |
09bef843 |
19 | #include "EXTERN.h" |
09bef843 |
20 | #include "perl.h" |
48462a74 |
21 | #include "XSUB.h" |
09bef843 |
22 | |
23 | /* |
24 | * Contributed by Spider Boardman (spider.boardman@orb.nashua.nh.us). |
25 | */ |
26 | |
349fd7b7 |
27 | static int |
acfe0abc |
28 | modify_SV_attributes(pTHX_ SV *sv, SV **retlist, SV **attrlist, int numattrs) |
09bef843 |
29 | { |
97aff369 |
30 | dVAR; |
09bef843 |
31 | SV *attr; |
09bef843 |
32 | int nret; |
33 | |
34 | for (nret = 0 ; numattrs && (attr = *attrlist++); numattrs--) { |
4373e329 |
35 | STRLEN len; |
cfd0369c |
36 | const char *name = SvPV_const(attr, len); |
4373e329 |
37 | const bool negated = (*name == '-'); |
38 | |
39 | if (negated) { |
09bef843 |
40 | name++; |
41 | len--; |
42 | } |
43 | switch (SvTYPE(sv)) { |
44 | case SVt_PVCV: |
45 | switch ((int)len) { |
46 | case 6: |
8cad210e |
47 | switch (name[3]) { |
d5adc3a1 |
48 | case 'l': |
8cad210e |
49 | if (memEQ(name, "lvalue", 6)) { |
09bef843 |
50 | if (negated) |
ea726b52 |
51 | CvFLAGS(MUTABLE_CV(sv)) &= ~CVf_LVALUE; |
09bef843 |
52 | else |
ea726b52 |
53 | CvFLAGS(MUTABLE_CV(sv)) |= CVf_LVALUE; |
09bef843 |
54 | continue; |
55 | } |
8cad210e |
56 | break; |
57 | case 'k': |
8cad210e |
58 | if (memEQ(name, "locked", 6)) { |
09bef843 |
59 | if (negated) |
ea726b52 |
60 | CvFLAGS(MUTABLE_CV(sv)) &= ~CVf_LOCKED; |
09bef843 |
61 | else |
ea726b52 |
62 | CvFLAGS(MUTABLE_CV(sv)) |= CVf_LOCKED; |
09bef843 |
63 | continue; |
64 | } |
65 | break; |
8cad210e |
66 | case 'h': |
67 | if (memEQ(name, "method", 6)) { |
09bef843 |
68 | if (negated) |
ea726b52 |
69 | CvFLAGS(MUTABLE_CV(sv)) &= ~CVf_METHOD; |
09bef843 |
70 | else |
ea726b52 |
71 | CvFLAGS(MUTABLE_CV(sv)) |= CVf_METHOD; |
09bef843 |
72 | continue; |
73 | } |
74 | break; |
75 | } |
76 | break; |
77 | } |
78 | break; |
79 | default: |
0256094b |
80 | switch ((int)len) { |
95f0a2f1 |
81 | case 6: |
8cad210e |
82 | switch (name[5]) { |
83 | case 'd': |
84 | if (memEQ(name, "share", 5)) { |
13c1b207 |
85 | if (negated) |
86 | Perl_croak(aTHX_ "A variable may not be unshared"); |
87 | SvSHARE(sv); |
88 | continue; |
89 | } |
90 | break; |
8cad210e |
91 | case 'e': |
92 | if (memEQ(name, "uniqu", 5)) { |
6e592b3a |
93 | if (isGV_with_GP(sv)) { |
44f8325f |
94 | if (negated) { |
95f0a2f1 |
95 | GvUNIQUE_off(sv); |
44f8325f |
96 | } else { |
95f0a2f1 |
97 | GvUNIQUE_on(sv); |
44f8325f |
98 | } |
95f0a2f1 |
99 | } |
100 | /* Hope this came from toke.c if not a GV. */ |
0256094b |
101 | continue; |
102 | } |
103 | } |
104 | } |
09bef843 |
105 | break; |
106 | } |
107 | /* anything recognized had a 'continue' above */ |
108 | *retlist++ = attr; |
109 | nret++; |
110 | } |
111 | |
112 | return nret; |
113 | } |
114 | |
48462a74 |
115 | MODULE = attributes PACKAGE = attributes |
09bef843 |
116 | |
48462a74 |
117 | void |
118 | _modify_attrs(...) |
119 | PREINIT: |
09bef843 |
120 | SV *rv, *sv; |
48462a74 |
121 | PPCODE: |
09bef843 |
122 | |
123 | if (items < 1) { |
124 | usage: |
afa74d42 |
125 | croak_xs_usage(cv, "@attributes"); |
09bef843 |
126 | } |
127 | |
128 | rv = ST(0); |
129 | if (!(SvOK(rv) && SvROK(rv))) |
130 | goto usage; |
131 | sv = SvRV(rv); |
132 | if (items > 1) |
acfe0abc |
133 | XSRETURN(modify_SV_attributes(aTHX_ sv, &ST(0), &ST(1), items-1)); |
09bef843 |
134 | |
135 | XSRETURN(0); |
09bef843 |
136 | |
48462a74 |
137 | void |
138 | _fetch_attrs(...) |
139 | PREINIT: |
09bef843 |
140 | SV *rv, *sv; |
141 | cv_flags_t cvflags; |
48462a74 |
142 | PPCODE: |
09bef843 |
143 | if (items != 1) { |
144 | usage: |
afa74d42 |
145 | croak_xs_usage(cv, "$reference"); |
09bef843 |
146 | } |
147 | |
148 | rv = ST(0); |
09bef843 |
149 | if (!(SvOK(rv) && SvROK(rv))) |
150 | goto usage; |
151 | sv = SvRV(rv); |
152 | |
153 | switch (SvTYPE(sv)) { |
154 | case SVt_PVCV: |
ea726b52 |
155 | cvflags = CvFLAGS((const CV *)sv); |
09bef843 |
156 | if (cvflags & CVf_LOCKED) |
84bafc02 |
157 | XPUSHs(newSVpvs_flags("locked", SVs_TEMP)); |
09bef843 |
158 | if (cvflags & CVf_LVALUE) |
84bafc02 |
159 | XPUSHs(newSVpvs_flags("lvalue", SVs_TEMP)); |
09bef843 |
160 | if (cvflags & CVf_METHOD) |
84bafc02 |
161 | XPUSHs(newSVpvs_flags("method", SVs_TEMP)); |
ea726b52 |
162 | if (GvUNIQUE(CvGV((const CV *)sv))) |
84bafc02 |
163 | XPUSHs(newSVpvs_flags("unique", SVs_TEMP)); |
95f0a2f1 |
164 | break; |
165 | case SVt_PVGV: |
6e592b3a |
166 | if (isGV_with_GP(sv) && GvUNIQUE(sv)) |
84bafc02 |
167 | XPUSHs(newSVpvs_flags("unique", SVs_TEMP)); |
09bef843 |
168 | break; |
169 | default: |
170 | break; |
171 | } |
172 | |
173 | PUTBACK; |
09bef843 |
174 | |
48462a74 |
175 | void |
176 | _guess_stash(...) |
177 | PREINIT: |
09bef843 |
178 | SV *rv, *sv; |
d277572a |
179 | dXSTARG; |
48462a74 |
180 | PPCODE: |
09bef843 |
181 | if (items != 1) { |
182 | usage: |
afa74d42 |
183 | croak_xs_usage(cv, "$reference"); |
09bef843 |
184 | } |
185 | |
186 | rv = ST(0); |
187 | ST(0) = TARG; |
188 | if (!(SvOK(rv) && SvROK(rv))) |
189 | goto usage; |
190 | sv = SvRV(rv); |
191 | |
192 | if (SvOBJECT(sv)) |
7423f6db |
193 | sv_setpvn(TARG, HvNAME_get(SvSTASH(sv)), HvNAMELEN_get(SvSTASH(sv))); |
09bef843 |
194 | #if 0 /* this was probably a bad idea */ |
195 | else if (SvPADMY(sv)) |
196 | sv_setsv(TARG, &PL_sv_no); /* unblessed lexical */ |
197 | #endif |
198 | else { |
5c284bb0 |
199 | const HV *stash = NULL; |
09bef843 |
200 | switch (SvTYPE(sv)) { |
201 | case SVt_PVCV: |
6676db26 |
202 | if (CvGV(sv) && isGV(CvGV(sv)) && GvSTASH(CvGV(sv))) |
09bef843 |
203 | stash = GvSTASH(CvGV(sv)); |
6676db26 |
204 | else if (/* !CvANON(sv) && */ CvSTASH(sv)) |
09bef843 |
205 | stash = CvSTASH(sv); |
206 | break; |
09bef843 |
207 | case SVt_PVGV: |
159b6efe |
208 | if (isGV_with_GP(sv) && GvGP(sv) && GvESTASH(MUTABLE_GV(sv))) |
209 | stash = GvESTASH(MUTABLE_GV(sv)); |
09bef843 |
210 | break; |
211 | default: |
212 | break; |
213 | } |
214 | if (stash) |
7423f6db |
215 | sv_setpvn(TARG, HvNAME_get(stash), HvNAMELEN_get(stash)); |
09bef843 |
216 | } |
217 | |
09bef843 |
218 | SvSETMAGIC(TARG); |
09bef843 |
219 | XSRETURN(1); |
09bef843 |
220 | |
48462a74 |
221 | void |
222 | reftype(...) |
223 | PREINIT: |
09bef843 |
224 | SV *rv, *sv; |
d277572a |
225 | dXSTARG; |
48462a74 |
226 | PPCODE: |
09bef843 |
227 | if (items != 1) { |
228 | usage: |
afa74d42 |
229 | croak_xs_usage(cv, "$reference"); |
09bef843 |
230 | } |
231 | |
232 | rv = ST(0); |
233 | ST(0) = TARG; |
5b295bef |
234 | SvGETMAGIC(rv); |
121e869f |
235 | if (!(SvOK(rv) && SvROK(rv))) |
09bef843 |
236 | goto usage; |
237 | sv = SvRV(rv); |
238 | sv_setpv(TARG, sv_reftype(sv, 0)); |
09bef843 |
239 | SvSETMAGIC(TARG); |
09bef843 |
240 | |
241 | XSRETURN(1); |
66610fdd |
242 | /* |
243 | * Local variables: |
244 | * c-indentation-style: bsd |
245 | * c-basic-offset: 4 |
246 | * indent-tabs-mode: t |
247 | * End: |
248 | * |
37442d52 |
249 | * ex: set ts=8 sts=4 sw=4 noet: |
48462a74 |
250 | */ |