1 files changed, 33 insertions, 0 deletions
diff --git a/circuitpython/lib/re1.5/charclass.c b/circuitpython/lib/re1.5/charclass.c
new file mode 100644
index 0000000..7f6388c
--- /dev/null
+++ b/circuitpython/lib/re1.5/charclass.c
@@ -0,0 +1,33 @@
+#include "re1.5.h"
+
+int _re1_5_classmatch(const char *pc, const char *sp)
+{
+    // pc points to "cnt" byte after opcode
+    int is_positive = (pc[-1] == Class);
+    int cnt = *pc++;
+    while (cnt--) {
+        if (*sp >= *pc && *sp <= pc[1]) return is_positive;
+        pc += 2;
+    }
+    return !is_positive;
+}
+
+int _re1_5_namedclassmatch(const char *pc, const char *sp)
+{
+    // pc points to name of class
+    int off = (*pc >> 5) & 1;
+    if ((*pc | 0x20) == 'd') {
+        if (!(*sp >= '0' && *sp <= '9')) {
+            off ^= 1;
+        }
+    } else if ((*pc | 0x20) == 's') {
+        if (!(*sp == ' ' || (*sp >= '\t' && *sp <= '\r'))) {
+            off ^= 1;
+        }
+    } else { // w
+        if (!((*sp >= 'A' && *sp <= 'Z') || (*sp >= 'a' && *sp <= 'z') || (*sp >= '0' && *sp <= '9') || *sp == '_')) {
+            off ^= 1;
+        }
+    }
+    return off;
+}