1 files changed, 31 insertions, 15 deletions

diff --git a/src/nvim/indent_c.c b/src/nvim/indent_c.c
index da068478be..ee20babaed 100644
--- a/src/nvim/indent_c.c
+++ b/src/nvim/indent_c.c
@@ -17,7 +17,11 @@
 #include "nvim/search.h"
 #include "nvim/strings.h"
 
-
+// Find result cache for cpp_baseclass
+typedef struct {
+    int found;
+    lpos_T lpos;
+} cpp_baseclass_cache_T;
 
 #ifdef INCLUDE_GENERATED_DECLARATIONS
 # include "indent_c.c.generated.h"
@@ -986,17 +990,21 @@ static int cin_isbreak(char_u *p)
  *
  * This is a lot of guessing.  Watch out for "cond ? func() : foo".
  */
-static int 
-cin_is_cpp_baseclass (
-    colnr_T *col           /* return: column to align with */
+static int cin_is_cpp_baseclass (
+    cpp_baseclass_cache_T *cached  // input and output
 )
 {
+  lpos_T *pos = &cached->lpos;  // find position
   char_u      *s;
   int class_or_struct, lookfor_ctor_init, cpp_base_class;
   linenr_T lnum = curwin->w_cursor.lnum;
   char_u      *line = get_cursor_line_ptr();
 
-  *col = 0;
+  if (pos->lnum <= lnum) {
+    return cached->found;  // Use the cached result
+  }
+
+  pos->col = 0;
 
   s = skipwhite(line);
   if (*s == '#')                /* skip #define FOO x ? (x) : x */
@@ -1038,6 +1046,7 @@ cin_is_cpp_baseclass (
     --lnum;
   }
 
+  pos->lnum = lnum;
   line = ml_get(lnum);
   s = cin_skipcomment(line);
   for (;; ) {
@@ -1064,7 +1073,7 @@ cin_is_cpp_baseclass (
          * cpp-base-class-declaration or constructor-initialization */
         cpp_base_class = TRUE;
         lookfor_ctor_init = class_or_struct = FALSE;
-        *col = 0;
+        pos->col = 0;
         s = cin_skipcomment(s + 1);
       } else
         s = cin_skipcomment(s + 1);
@@ -1092,23 +1101,29 @@ cin_is_cpp_baseclass (
         /* if it is not an identifier, we are wrong */
         class_or_struct = FALSE;
         lookfor_ctor_init = FALSE;
-      } else if (*col == 0) {
+      } else if (pos->col == 0) {
         /* it can't be a constructor-initialization any more */
         lookfor_ctor_init = FALSE;
 
         /* the first statement starts here: lineup with this one... */
-        if (cpp_base_class)
-          *col = (colnr_T)(s - line);
+        if (cpp_base_class) {
+          pos->col = (colnr_T)(s - line);
+        }
       }
 
       /* When the line ends in a comma don't align with it. */
-      if (lnum == curwin->w_cursor.lnum && *s == ',' && cin_nocode(s + 1))
-        *col = 0;
+      if (lnum == curwin->w_cursor.lnum && *s == ',' && cin_nocode(s + 1)) {
+        pos->col = 0;
+      }
 
       s = cin_skipcomment(s + 1);
     }
   }
 
+  cached->found = cpp_base_class;
+  if (cpp_base_class) {
+    pos->lnum = lnum;
+  }
   return cpp_base_class;
 }
 
@@ -1596,6 +1611,7 @@ int get_c_indent(void)
   int cont_amount = 0;              /* amount for continuation line */
   int original_line_islabel;
   int added_to_amount = 0;
+  cpp_baseclass_cache_T cache_cpp_baseclass = { false, { MAXLNUM, 0 } };
 
   /* make a copy, value is changed below */
   int ind_continuation = curbuf->b_ind_continuation;
@@ -2511,7 +2527,7 @@ int get_c_indent(void)
            */						    /* XXX */
           n = FALSE;
           if (lookfor != LOOKFOR_TERM && curbuf->b_ind_cpp_baseclass > 0) {
-            n = cin_is_cpp_baseclass(&col);
+            n = cin_is_cpp_baseclass(&cache_cpp_baseclass);
             l = get_cursor_line_ptr();
           }
           if (n) {
@@ -2527,7 +2543,7 @@ int get_c_indent(void)
               continue;
             } else
               /* XXX */
-              amount = get_baseclass_amount(col);
+              amount = get_baseclass_amount(cache_cpp_baseclass.lpos.col);
             break;
           } else if (lookfor == LOOKFOR_CPP_BASECLASS) {
             /* only look, whether there is a cpp base class
@@ -3132,12 +3148,12 @@ term_again:
          */						    /* XXX */
         n = FALSE;
         if (curbuf->b_ind_cpp_baseclass != 0 && theline[0] != '{') {
-          n = cin_is_cpp_baseclass(&col);
+          n = cin_is_cpp_baseclass(&cache_cpp_baseclass);
           l = get_cursor_line_ptr();
         }
         if (n) {
           /* XXX */
-          amount = get_baseclass_amount(col);
+          amount = get_baseclass_amount(cache_cpp_baseclass.lpos.col);
           break;
         }