Extract range type check functions

range.c

@@ -1769,6 +1769,35 @@ range_include(VALUE range, VALUE val)
     return rb_call_super(1, &val);
 }
 
+static inline bool
+range_integer_edge_p(VALUE beg, VALUE end)
+{
+    return (!NIL_P(rb_check_to_integer(beg, "to_int")) ||
+            !NIL_P(rb_check_to_integer(end, "to_int")));
+}
+
+static inline bool
+range_string_edge_p(VALUE beg, VALUE end)
+{
+    return RB_TYPE_P(beg, T_STRING) || RB_TYPE_P(end, T_STRING);
+}
+
+static inline bool
+range_string_range_p(VALUE beg, VALUE end)
+{
+    return RB_TYPE_P(beg, T_STRING) && RB_TYPE_P(end, T_STRING);
+}
+
+static inline VALUE
+range_include_fallback(VALUE beg, VALUE end)
+{
+    if (NIL_P(beg) || NIL_P(end)) {
+        rb_raise(rb_eTypeError, "cannot determine inclusion in beginless/endless ranges");
+    }
+
+    return Qundef;
+}
+
 static VALUE
 range_string_cover_internal(VALUE range, VALUE val)
 {
@@ -1777,13 +1806,11 @@ range_string_cover_internal(VALUE range, VALUE val)
     int nv = FIXNUM_P(beg) || FIXNUM_P(end) ||
              linear_object_p(beg) || linear_object_p(end);
 
-    if (nv ||
-        !NIL_P(rb_check_to_integer(beg, "to_int")) ||
-        !NIL_P(rb_check_to_integer(end, "to_int"))) {
+    if (nv || range_integer_edge_p(beg, end)) {
         return r_cover_p(range, beg, end, val);
     }
-    else if (RB_TYPE_P(beg, T_STRING) || RB_TYPE_P(end, T_STRING)) {
-        if (RB_TYPE_P(beg, T_STRING) && RB_TYPE_P(end, T_STRING)) {
+    else if (range_string_edge_p(beg, end)) {
+        if (range_string_range_p(beg, end)) {
             return r_cover_p(range, beg, end, val);
         }
         if (NIL_P(beg)) {
@@ -1801,11 +1828,7 @@ range_string_cover_internal(VALUE range, VALUE val)
         }
     }
 
-    if (NIL_P(beg) || NIL_P(end)) {
-        rb_raise(rb_eTypeError, "cannot determine inclusion in beginless/endless ranges");
-    }
-
-    return Qundef;
+    return range_include_fallback(beg, end);
 }
 
 static VALUE
@@ -1816,20 +1839,14 @@ range_include_internal(VALUE range, VALUE val)
     int nv = FIXNUM_P(beg) || FIXNUM_P(end) ||
              linear_object_p(beg) || linear_object_p(end);
 
-    if (nv ||
-        !NIL_P(rb_check_to_integer(beg, "to_int")) ||
-        !NIL_P(rb_check_to_integer(end, "to_int"))) {
+    if (nv || range_integer_edge_p(beg, end)) {
         return r_cover_p(range, beg, end, val);
     }
-    else if (RB_TYPE_P(beg, T_STRING) && RB_TYPE_P(end, T_STRING)) {
+    else if (range_string_range_p(beg, end)) {
         return rb_str_include_range_p(beg, end, val, RANGE_EXCL(range));
     }
 
-    if (NIL_P(beg) || NIL_P(end)) {
-        rb_raise(rb_eTypeError, "cannot determine inclusion in beginless/endless ranges");
-    }
-
-    return Qundef;
+    return range_include_fallback(beg, end);
 }
 
 static int r_cover_range_p(VALUE range, VALUE beg, VALUE end, VALUE val);