Add hex char rule

src/main/c/rule/char/hex.c

@@ -0,0 +1,30 @@
+#ifndef _HDR_HYPERBUILD_RULE_HEX
+#define _HDR_HYPERBUILD_RULE_HEX
+
+#include "../../ext/nicehash/set/int32.h"
+#include "../../util/hbchar.h"
+
+static nh_set_int32_t hbr_hex_set;
+
+void hbr_hex_add_elems(nh_set_int32_t set) {
+  for (char c = 0x30; c <= 0x39; c++) { // 0-9
+    nh_set_int32_add(set, c);
+  }
+  for (char c = 0x41; c <= 0x46; c++) { // A-F
+    nh_set_int32_add(set, c);
+  }
+  for (char c = 0x61; c <= 0x66; c++) { // a-f
+    nh_set_int32_add(set, c);
+  }
+}
+
+void hbr_hex_init(void) {
+  hbr_hex_set = nh_set_int32_create();
+  hbr_hex_add_elems(hbr_hex_set);
+}
+
+int hbr_hex_check(hb_char_t c) {
+  return nh_set_int32_has(hbr_hex_set, c);
+}
+
+#endif // _HDR_HYPERBUILD_RULE_HEX

src/main/c/rule/init.c

@@ -5,6 +5,7 @@
 #include "./char/attrvalquote.c"
 #include "./char/c0.c"
 #include "./char/digit.c"
+#include "./char/hex.c"
 #include "./char/lcalpha.c"
 #include "./char/tagname.c"
 #include "./char/ucalpha.c"
@@ -34,6 +35,7 @@ void hbr_init(void) {
   // Core
   hbr_c0_init();
   hbr_digit_init();
+  hbr_hex_init();
   hbr_ucalpha_init();
   hbr_lcalpha_init();
   hbr_whitespace_init();