Change is-a predicate stuff

[gitmo/Mouse.git] / xs-src / Mouse.xs

diff --git a/xs-src/Mouse.xs b/xs-src/Mouse.xs
index c59c15c..59070e4 100644 (file)
--- a/xs-src/Mouse.xs
+++ b/xs-src/Mouse.xs
@@ -86,6 +86,46 @@ CODE:
 OUTPUT:
     RETVAL
 
+void
+_generate_isa_predicate_for(SV* klass, const char* predicate_name = NULL)
+PPCODE:
+{
+    STRLEN klass_len;
+    const char* klass_pv;
+    HV* stash;
+    CV* xsub;
+
+    if(!SvOK(klass)){
+        croak("You must define a class name for generate_for");
+    }
+    klass_pv = SvPV_const(klass, klass_len);
+    klass_pv = mouse_canonicalize_package_name(klass_pv);
+
+    if(strNE(klass_pv, "UNIVERSAL")){
+        static MGVTBL mouse_util_type_constraints_vtbl; /* not used, only for identity */
+
+        xsub = newXS(predicate_name, XS_isa_check, __FILE__);
+
+        stash = gv_stashpvn(klass_pv, klass_len, GV_ADD);
+
+        CvXSUBANY(xsub).any_ptr = sv_magicext(
+            (SV*)xsub,
+            (SV*)stash, /* mg_obj */
+            PERL_MAGIC_ext,
+            &mouse_util_type_constraints_vtbl,
+            klass_pv,   /* mg_ptr */
+            klass_len   /* mg_len */
+        );
+    }
+    else{
+        xsub = newXS(predicate_name, XS_isa_check_for_universal, __FILE__);
+    }
+
+    if(predicate_name == NULL){ /* anonymous predicate */
+        XPUSHs( newRV_noinc((SV*)xsub) );
+    }
+}
+
 
 MODULE = Mouse  PACKAGE = Mouse::Meta::Module