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1 | #if defined(PERL_EXT_RE_DEBUG) && !defined(DEBUGGING) |
2 | # define DEBUGGING |
3 | #endif |
4 | |
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5 | #define PERL_NO_GET_CONTEXT |
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6 | #include "EXTERN.h" |
7 | #include "perl.h" |
8 | #include "XSUB.h" |
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9 | #include "re_comp.h" |
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10 | |
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11 | |
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12 | START_EXTERN_C |
13 | |
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14 | extern REGEXP* my_re_compile (pTHX_ const SV * const pattern, const U32 pm_flags); |
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15 | extern I32 my_regexec (pTHX_ REGEXP * const prog, char* stringarg, char* strend, |
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16 | char* strbeg, I32 minend, SV* screamer, |
17 | void* data, U32 flags); |
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18 | |
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19 | extern char* my_re_intuit_start (pTHX_ REGEXP * const prog, SV *sv, char *strpos, |
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20 | char *strend, const U32 flags, |
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21 | struct re_scream_pos_data_s *data); |
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22 | extern SV* my_re_intuit_string (pTHX_ REGEXP * const prog); |
23 | |
24 | extern void my_regfree (pTHX_ REGEXP * const r); |
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25 | |
26 | extern void my_reg_numbered_buff_fetch(pTHX_ REGEXP * const rx, const I32 paren, |
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27 | SV * const usesv); |
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28 | extern void my_reg_numbered_buff_store(pTHX_ REGEXP * const rx, const I32 paren, |
29 | SV const * const value); |
30 | extern I32 my_reg_numbered_buff_length(pTHX_ REGEXP * const rx, const I32 paren); |
31 | |
32 | extern SV* my_reg_named_buff_fetch(pTHX_ REGEXP * const rx, SV * const key, |
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33 | const U32 flags); |
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34 | |
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35 | extern SV* my_reg_qr_package(pTHX_ REGEXP * const rx); |
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36 | #if defined(USE_ITHREADS) |
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37 | extern void* my_regdupe (pTHX_ REGEXP * const r, CLONE_PARAMS *param); |
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38 | #endif |
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39 | |
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40 | EXTERN_C const struct regexp_engine my_reg_engine; |
41 | |
42 | END_EXTERN_C |
43 | |
44 | const struct regexp_engine my_reg_engine = { |
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45 | my_re_compile, |
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46 | my_regexec, |
47 | my_re_intuit_start, |
48 | my_re_intuit_string, |
49 | my_regfree, |
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50 | my_reg_numbered_buff_fetch, |
51 | my_reg_numbered_buff_store, |
52 | my_reg_numbered_buff_length, |
53 | my_reg_named_buff_fetch, |
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54 | my_reg_qr_package, |
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55 | #if defined(USE_ITHREADS) |
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56 | my_regdupe |
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57 | #endif |
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58 | }; |
59 | |
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60 | REGEXP * |
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61 | get_re_arg( pTHX_ SV *sv, U32 flags, MAGIC **mgp) { |
62 | MAGIC *mg; |
63 | if (sv) { |
64 | if (SvMAGICAL(sv)) |
65 | mg_get(sv); |
66 | if (SvROK(sv) && |
67 | (sv = (SV*)SvRV(sv)) && /* assign deliberate */ |
68 | SvTYPE(sv) == SVt_PVMG && |
69 | (mg = mg_find(sv, PERL_MAGIC_qr))) /* assign deliberate */ |
70 | { |
71 | if (mgp) *mgp = mg; |
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72 | return (REGEXP *)mg->mg_obj; |
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73 | } |
74 | } |
75 | if (mgp) *mgp = NULL; |
76 | return ((flags && PL_curpm) ? PM_GETRE(PL_curpm) : NULL); |
77 | } |
78 | |
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79 | MODULE = re PACKAGE = re |
80 | |
81 | void |
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82 | install() |
83 | PPCODE: |
84 | PL_colorset = 0; /* Allow reinspection of ENV. */ |
85 | /* PL_debug |= DEBUG_r_FLAG; */ |
86 | XPUSHs(sv_2mortal(newSViv(PTR2IV(&my_reg_engine)))); |
87 | |
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88 | |
89 | void |
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90 | regexp_pattern(sv) |
91 | SV * sv |
92 | PROTOTYPE: $ |
93 | PREINIT: |
94 | MAGIC *mg; |
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95 | REGEXP *re; |
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96 | PPCODE: |
97 | { |
98 | /* |
99 | Checks if a reference is a regex or not. If the parameter is |
100 | not a ref, or is not the result of a qr// then returns false |
101 | in scalar context and an empty list in list context. |
102 | Otherwise in list context it returns the pattern and the |
103 | modifiers, in scalar context it returns the pattern just as it |
104 | would if the qr// was stringified normally, regardless as |
105 | to the class of the variable and any strigification overloads |
106 | on the object. |
107 | */ |
108 | |
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109 | if ( re = get_re_arg( aTHX_ sv, 0, &mg) ) /* assign deliberate */ |
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110 | { |
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111 | /* Housten, we have a regex! */ |
112 | SV *pattern; |
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113 | STRLEN patlen = 0; |
114 | STRLEN left = 0; |
115 | char reflags[6]; |
116 | |
117 | if ( GIMME_V == G_ARRAY ) { |
118 | /* |
119 | we are in list context so stringify |
120 | the modifiers that apply. We ignore "negative |
121 | modifiers" in this scenario. |
122 | */ |
123 | |
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124 | char *fptr = INT_PAT_MODS; |
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125 | char ch; |
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126 | U16 match_flags = (U16)((re->extflags & PMf_COMPILETIME) >> 12); |
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127 | |
128 | while((ch = *fptr++)) { |
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129 | if(match_flags & 1) { |
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130 | reflags[left++] = ch; |
131 | } |
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132 | match_flags >>= 1; |
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133 | } |
134 | |
135 | pattern = sv_2mortal(newSVpvn(re->precomp,re->prelen)); |
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136 | if (re->extflags & RXf_UTF8) SvUTF8_on(pattern); |
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137 | |
138 | /* return the pattern and the modifiers */ |
139 | XPUSHs(pattern); |
140 | XPUSHs(sv_2mortal(newSVpvn(reflags,left))); |
141 | XSRETURN(2); |
142 | } else { |
143 | /* Scalar, so use the string that Perl would return */ |
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144 | /* return the pattern in (?msix:..) format */ |
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145 | pattern = sv_2mortal(newSVpvn(re->wrapped,re->wraplen)); |
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146 | if (re->extflags & RXf_UTF8) |
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147 | SvUTF8_on(pattern); |
148 | XPUSHs(pattern); |
149 | XSRETURN(1); |
150 | } |
151 | } else { |
152 | /* It ain't a regexp folks */ |
153 | if ( GIMME_V == G_ARRAY ) { |
154 | /* return the empty list */ |
155 | XSRETURN_UNDEF; |
156 | } else { |
157 | /* Because of the (?:..) wrapping involved in a |
158 | stringified pattern it is impossible to get a |
159 | result for a real regexp that would evaluate to |
160 | false. Therefore we can return PL_sv_no to signify |
161 | that the object is not a regex, this means that one |
162 | can say |
163 | |
164 | if (regex($might_be_a_regex) eq '(?:foo)') { } |
165 | |
166 | and not worry about undefined values. |
167 | */ |
168 | XSRETURN_NO; |
169 | } |
170 | } |
171 | /* NOT-REACHED */ |
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172 | } |
173 | |
174 | |
175 | void |
176 | regmust(sv) |
177 | SV * sv |
178 | PROTOTYPE: $ |
179 | PREINIT: |
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180 | REGEXP *re; |
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181 | PPCODE: |
182 | { |
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183 | if ( re = get_re_arg( aTHX_ sv, 0, 0) ) /* assign deliberate */ |
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184 | { |
185 | SV *an = &PL_sv_no; |
186 | SV *fl = &PL_sv_no; |
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187 | if (re->anchored_substr) { |
188 | an = newSVsv(re->anchored_substr); |
189 | } else if (re->anchored_utf8) { |
190 | an = newSVsv(re->anchored_utf8); |
191 | } |
192 | if (re->float_substr) { |
193 | fl = newSVsv(re->float_substr); |
194 | } else if (re->float_utf8) { |
195 | fl = newSVsv(re->float_utf8); |
196 | } |
197 | XPUSHs(an); |
198 | XPUSHs(fl); |
199 | XSRETURN(2); |
200 | } |
201 | XSRETURN_UNDEF; |
202 | } |
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203 | |