distinguish root block from non-root blocks; in root case, we do not want to do a lookup-range to generate the block's expression (but in all other cases we do)

src/eval/eval_ir.c

@@ -101,7 +101,7 @@ e_lookup_rule_map_insert(Arena *arena, E_LookupRuleMap *map, E_LookupRule *rule)
 internal E_LookupRule *
 e_lookup_rule_from_string(String8 string)
 {
-  E_LookupRule *result = &e_lookup_rule__default;
+  E_LookupRule *result = &e_lookup_rule__nil;
   if(e_ir_ctx->lookup_rule_map != 0 && e_ir_ctx->lookup_rule_map->slots_count != 0)
   {
     U64 hash = e_hash_from_string(5381, string);

src/eval/eval_ir.h

@@ -242,6 +242,15 @@ struct E_IRCtx
 ////////////////////////////////
 //~ rjf: Globals
 
+local_persist read_only E_LookupRule e_lookup_rule__nil =
+{
+  str8_lit_comp("nil"),
+  E_LOOKUP_INFO_FUNCTION_NAME(default),
+  E_LOOKUP_ACCESS_FUNCTION_NAME(default),
+  E_LOOKUP_RANGE_FUNCTION_NAME(default),
+  E_LOOKUP_ID_FROM_NUM_FUNCTION_NAME(default),
+  E_LOOKUP_NUM_FROM_ID_FUNCTION_NAME(default),
+};
 local_persist read_only E_LookupRule e_lookup_rule__default =
 {
   str8_lit_comp("default"),

src/eval_visualization/eval_visualization_core.c

@@ -508,7 +508,7 @@ ev_block_tree_from_expr(Arena *arena, EV_View *view, String8 filter, String8 str
       {
         E_LookupRule *lookup_rule_candidate = e_lookup_rule_from_string(tag->first->string);
         EV_ViewRuleInfo *expand_rule_candidate = ev_view_rule_info_from_string(tag->first->string);
-        if(lookup_rule_candidate != &e_lookup_rule__default)
+        if(lookup_rule_candidate != &e_lookup_rule__nil)
         {
           lookup_rule = lookup_rule_candidate;
           lookup_rule_tag = tag;
@@ -946,6 +946,7 @@ ev_windowed_row_list_from_block_range_list(Arena *arena, EV_View *view, String8
       if(block_relative_range__windowed.max > block_relative_range__windowed.min)
       {
         // rjf: get info about expansion range
+        B32 is_root = 0;
         U64 range_exprs_count = dim_1u64(block_relative_range__windowed);
         E_Expr **range_exprs = push_array(arena, E_Expr *, range_exprs_count);
         String8 *range_exprs_strings = push_array(arena, String8 ,range_exprs_count);
@@ -953,10 +954,17 @@ ev_windowed_row_list_from_block_range_list(Arena *arena, EV_View *view, String8
         {
           range_exprs[idx] = &e_expr_nil;
         }
-        n->v.block->lookup_rule->range(arena, n->v.block->expr, block_relative_range__windowed, range_exprs, range_exprs_strings, n->v.block->lookup_rule_user_data);
+        if(n->v.block->lookup_rule == &e_lookup_rule__nil)
+        {
+          is_root = 1;
+        }
+        else
+        {
+          n->v.block->lookup_rule->range(arena, n->v.block->expr, block_relative_range__windowed, range_exprs, range_exprs_strings, n->v.block->lookup_rule_user_data);
+        }
         
         // rjf: no expansion operator applied -> push row for block expression; pass through block info
-        if(range_exprs_count == 0)
+        if(is_root)
         {
           EV_WindowedRowNode *row_node = push_array(arena, EV_WindowedRowNode, 1);
           SLLQueuePush(rows.first, rows.last, row_node);

src/eval_visualization/eval_visualization_core.h

@@ -283,7 +283,7 @@ global read_only EV_ViewRuleInfo ev_nil_view_rule_info =
 };
 thread_static EV_ViewRuleInfoTable *ev_view_rule_info_table = 0;
 thread_static EV_AutoViewRuleTable *ev_auto_view_rule_table = 0;
-global read_only EV_Block ev_nil_block = {&ev_nil_block, &ev_nil_block, &ev_nil_block, &ev_nil_block, &ev_nil_block, {0}, 0, {0}, &e_expr_nil, &e_expr_nil, &e_expr_nil, &e_lookup_rule__default, &ev_nil_view_rule_info};
+global read_only EV_Block ev_nil_block = {&ev_nil_block, &ev_nil_block, &ev_nil_block, &ev_nil_block, &ev_nil_block, {0}, 0, {0}, &e_expr_nil, &e_expr_nil, &e_expr_nil, &e_lookup_rule__nil, &ev_nil_view_rule_info};
 
 ////////////////////////////////
 //~ rjf: Key Functions