vim-patch:partial:9.1.0462: eval5() and eval7 are too complex

Problem:  eval5() and eval7 are too complex
Solution: Refactor eval5() and eval7() in eval.c
          (Yegappan Lakshmanan)

closes: vim/vim#14900

734286e4c6

Co-authored-by: Yegappan Lakshmanan <yegappan@yahoo.com>

src/nvim/eval.c

@@ -2974,7 +2974,7 @@ static int eval_concat_str(typval_T *tv1, typval_T *tv2)
 
 /// Add or subtract numbers "tv1" and "tv2" and store the result in "tv1".
 /// The numbers can be whole numbers or floats.
-static int eval_addsub_num(typval_T *tv1, typval_T *tv2, int op)
+static int eval_addsub_number(typval_T *tv1, typval_T *tv2, int op)
 {
   bool error = false;
   varnumber_T n1, n2;
@@ -3102,7 +3102,7 @@ static int eval5(char **arg, typval_T *rettv, evalarg_T *const evalarg)
           return FAIL;
         }
       } else {
-        if (eval_addsub_num(rettv, &var2, op) == FAIL) {
+        if (eval_addsub_number(rettv, &var2, op) == FAIL) {
           return FAIL;
         }
       }
@@ -3112,6 +3112,85 @@ static int eval5(char **arg, typval_T *rettv, evalarg_T *const evalarg)
   return OK;
 }
 
+/// Multiply or divide or compute the modulo of numbers "tv1" and "tv2" and
+/// store the result in "tv1".  The numbers can be whole numbers or floats.
+static int eval_multdiv_number(typval_T *tv1, typval_T *tv2, int op)
+  FUNC_ATTR_NO_SANITIZE_UNDEFINED
+{
+  varnumber_T n1, n2;
+  bool use_float = false;
+
+  float_T f1 = 0;
+  float_T f2 = 0;
+  bool error = false;
+  if (tv1->v_type == VAR_FLOAT) {
+    f1 = tv1->vval.v_float;
+    use_float = true;
+    n1 = 0;
+  } else {
+    n1 = tv_get_number_chk(tv1, &error);
+  }
+  tv_clear(tv1);
+  if (error) {
+    tv_clear(tv2);
+    return FAIL;
+  }
+
+  if (tv2->v_type == VAR_FLOAT) {
+    if (!use_float) {
+      f1 = (float_T)n1;
+      use_float = true;
+    }
+    f2 = tv2->vval.v_float;
+    n2 = 0;
+  } else {
+    n2 = tv_get_number_chk(tv2, &error);
+    tv_clear(tv2);
+    if (error) {
+      return FAIL;
+    }
+    if (use_float) {
+      f2 = (float_T)n2;
+    }
+  }
+
+  // Compute the result.
+  // When either side is a float the result is a float.
+  if (use_float) {
+    if (op == '*') {
+      f1 = f1 * f2;
+    } else if (op == '/') {
+      // uncrustify:off
+
+      // Division by zero triggers error from AddressSanitizer
+      f1 = (f2 == 0 ? (
+#ifdef NAN
+          f1 == 0 ? (float_T)NAN :
+#endif
+          (f1 > 0 ? (float_T)INFINITY : (float_T)-INFINITY)) : f1 / f2);
+
+      // uncrustify:on
+    } else {
+      emsg(_("E804: Cannot use '%' with Float"));
+      return FAIL;
+    }
+    tv1->v_type = VAR_FLOAT;
+    tv1->vval.v_float = f1;
+  } else {
+    if (op == '*') {
+      n1 = n1 * n2;
+    } else if (op == '/') {
+      n1 = num_divide(n1, n2);
+    } else {
+      n1 = num_modulus(n1, n2);
+    }
+    tv1->v_type = VAR_NUMBER;
+    tv1->vval.v_number = n1;
+  }
+
+  return OK;
+}
+
 /// Handle fifth level expression:
 ///  - *  number multiplication
 ///  - /  number division
@@ -3125,10 +3204,7 @@ static int eval5(char **arg, typval_T *rettv, evalarg_T *const evalarg)
 ///                          float
 /// @return  OK or FAIL.
 static int eval6(char **arg, typval_T *rettv, evalarg_T *const evalarg, bool want_string)
-  FUNC_ATTR_NO_SANITIZE_UNDEFINED
 {
-  bool use_float = false;
-
   // Get the first variable.
   if (eval7(arg, rettv, evalarg, want_string) == FAIL) {
     return FAIL;
@@ -3141,26 +3217,7 @@ static int eval6(char **arg, typval_T *rettv, evalarg_T *const evalarg, bool wan
       break;
     }
 
-    varnumber_T n1, n2;
-    float_T f1 = 0;
-    float_T f2 = 0;
-    bool error = false;
     const bool evaluate = evalarg == NULL ? 0 : (evalarg->eval_flags & EVAL_EVALUATE);
-    if (evaluate) {
-      if (rettv->v_type == VAR_FLOAT) {
-        f1 = rettv->vval.v_float;
-        use_float = true;
-        n1 = 0;
-      } else {
-        n1 = tv_get_number_chk(rettv, &error);
-      }
-      tv_clear(rettv);
-      if (error) {
-        return FAIL;
-      }
-    } else {
-      n1 = 0;
-    }
 
     // Get the second variable.
     *arg = skipwhite(*arg + 1);
@@ -3170,56 +3227,9 @@ static int eval6(char **arg, typval_T *rettv, evalarg_T *const evalarg, bool wan
     }
 
     if (evaluate) {
-      if (var2.v_type == VAR_FLOAT) {
-        if (!use_float) {
-          f1 = (float_T)n1;
-          use_float = true;
-        }
-        f2 = var2.vval.v_float;
-        n2 = 0;
-      } else {
-        n2 = tv_get_number_chk(&var2, &error);
-        tv_clear(&var2);
-        if (error) {
-          return FAIL;
-        }
-        if (use_float) {
-          f2 = (float_T)n2;
-        }
-      }
-
       // Compute the result.
-      // When either side is a float the result is a float.
+      if (eval_multdiv_number(rettv, &var2, op) == FAIL) {
-      if (use_float) {
+        return FAIL;
-        if (op == '*') {
-          f1 = f1 * f2;
-        } else if (op == '/') {
-          // uncrustify:off
-
-          // Division by zero triggers error from AddressSanitizer
-          f1 = (f2 == 0 ? (
-#ifdef NAN
-              f1 == 0 ? (float_T)NAN :
-#endif
-              (f1 > 0 ? (float_T)INFINITY : (float_T)-INFINITY)) : f1 / f2);
-
-          // uncrustify:on
-        } else {
-          emsg(_("E804: Cannot use '%' with Float"));
-          return FAIL;
-        }
-        rettv->v_type = VAR_FLOAT;
-        rettv->vval.v_float = f1;
-      } else {
-        if (op == '*') {
-          n1 = n1 * n2;
-        } else if (op == '/') {
-          n1 = num_divide(n1, n2);
-        } else {
-          n1 = num_modulus(n1, n2);
-        }
-        rettv->v_type = VAR_NUMBER;
-        rettv->vval.v_number = n1;
       }
     }
   }