#define regcpblow(cp) LEAVE_SCOPE(cp) /* Ignores regcppush()ed data. */
+#ifndef PERL_IN_XSUB_RE
+
bool
Perl_isFOO_lc(pTHX_ const U8 classnum, const U8 character)
{
return FALSE;
}
+#endif
+
STATIC bool
S_isFOO_utf8_lc(pTHX_ const U8 classnum, const U8* character)
{
return TRUE;
}
+bool
+Perl__is_grapheme(pTHX_ const U8 * strbeg, const U8 * s, const U8 * strend, const UV cp)
+{
+ /* Temporary helper function for toke.c. Verify that the code point 'cp'
+ * is a stand-alone grapheme. The UTF-8 for 'cp' begins at position 's' in
+ * the larger string bounded by 'strbeg' and 'strend'.
+ *
+ * 'cp' needs to be assigned (if not a future version of the Unicode
+ * Standard could make it something that combines with adjacent characters,
+ * so code using it would then break), and there has to be a GCB break
+ * before and after the character. */
+
+ GCB_enum cp_gcb_val, prev_cp_gcb_val, next_cp_gcb_val;
+ const U8 * prev_cp_start;
+
+ PERL_ARGS_ASSERT__IS_GRAPHEME;
+
+ /* Unassigned code points are forbidden */
+ if (UNLIKELY(! ELEMENT_RANGE_MATCHES_INVLIST(
+ _invlist_search(PL_Assigned_invlist, cp))))
+ {
+ return FALSE;
+ }
+
+ cp_gcb_val = getGCB_VAL_CP(cp);
+
+ /* Find the GCB value of the previous code point in the input */
+ prev_cp_start = utf8_hop_back(s, -1, strbeg);
+ if (UNLIKELY(prev_cp_start == s)) {
+ prev_cp_gcb_val = GCB_EDGE;
+ }
+ else {
+ prev_cp_gcb_val = getGCB_VAL_UTF8(prev_cp_start, strend);
+ }
+
+ /* And check that is a grapheme boundary */
+ if (! isGCB(prev_cp_gcb_val, cp_gcb_val, strbeg, s,
+ TRUE /* is UTF-8 encoded */ ))
+ {
+ return FALSE;
+ }
+
+ /* Similarly verify there is a break between the current character and the
+ * following one */
+ s += UTF8SKIP(s);
+ if (s >= strend) {
+ next_cp_gcb_val = GCB_EDGE;
+ }
+ else {
+ next_cp_gcb_val = getGCB_VAL_UTF8(s, strend);
+ }
+
+ return isGCB(cp_gcb_val, next_cp_gcb_val, strbeg, s, TRUE);
+}
+
+
+
+
/*
* ex: set ts=8 sts=4 sw=4 et:
*/