1 files changed, 44 insertions, 0 deletions
diff --git a/core.xs b/core.xs
new file mode 100644
index 0000000..3f12ea2
--- /dev/null
+++ b/core.xs
@@ -0,0 +1,44 @@
+#include "EXTERN.h"
+#include "perl.h"
+#include "XSUB.h"
+
+#include "ppport.h"
+
+#include "stolen_chunk_of_pp_ctl.c"
+
+STATIC OP*
+install_sm_op(pTHX_ OP *o, GV *gv, SV *ud)
+{
+    OP *list, *left, *right, *new;
+
+    list = cUNOPo->op_first;
+    left = cLISTOPx(list)->op_first->op_sibling; /* skip over the pushmark */
+    right = left->op_sibling;
+
+    cLISTOPx(list)->op_first->op_sibling = right->op_sibling;
+    left->op_sibling = right->op_sibling = NULL;
+    op_free(o);
+
+    new = newBINOP(OP_CUSTOM, 0, left, right);
+    new->op_ppaddr = INT2PTR(Perl_ppaddr_t, Perl_pp_old_smartmatch);
+
+    return new;
+}
+
+MODULE = smartmatch::engine::core  PACKAGE = smartmatch::engine::core
+
+PROTOTYPES: DISABLE
+
+void
+init(match)
+    SV *match;
+    PREINIT:
+    CV *cv;
+    CODE:
+        if (!SvROK(match) || SvTYPE(SvRV(match)) != SVt_PVCV) {
+            croak("not a coderef");
+        }
+
+        cv = (CV*)SvRV(match);
+
+        cv_set_call_checker(cv, install_sm_op, (SV*)cv);