fix(blink_cmp_source): Handling of DB patterns after operators

The completion now correctly handles DB patterns after any operator
(:=, =>, =, <>, >=, <=, >, <, AND, OR, NOT) by finding the last operator
and only matching DB patterns in the active portion after it.

lua/scl/blink_cmp_source.lua

@@ -33,8 +33,8 @@ function M.is_available(context)
     local char_at = line:sub(col, col)
     local prev_char = col > 1 and line:sub(col - 1, col - 1) or ""
     
-    -- Only trigger on our specific characters
-    if char_at == "." or char_at == "(" or char_at == "#" or char_at == '"' or
+    -- Only trigger on our specific characters (including space for := assignments)
+    if char_at == "." or char_at == "(" or char_at == "#" or char_at == '"' or char_at == " " or
        prev_char == "." or prev_char == "(" or prev_char == "#" or prev_char == '"' then
       return true
     end
@@ -157,31 +157,71 @@ function M:get_completions(context, callback)
 
   -- Check for Global DB completion (quoted DB names like "HmiData")
   local trimmed = line:gsub("^%s+", ""):gsub("%s+$", "")
+
+  -- Find the "active portion" of the line - after the last operator if present
+  -- Operators: :=, =>, =, <>, >=, <=, >, <, AND, OR, NOT
+  -- This ensures we match DB patterns nearest to the cursor, not the first in line
+  local active_portion = line_before_cursor
   
-  -- Check for "DBName" pattern (quoted DB name access with dot)
-  local db_member_pattern = trimmed:match('"([%w_]+)"%.([%w_]*)')
+  local function find_last_operator_pos(text)
+    local last_pos = 0
+    local operators = {":=", "=>", "<>", ">=", "<=", "=", ">", "<"}
+    for _, op in ipairs(operators) do
+      local search_start = 1
+      while true do
+        local pos = text:find(op, search_start, true)
+        if not pos then break end
+        if pos > last_pos then
+          last_pos = pos + #op
+        end
+        search_start = pos + 1
+      end
+    end
+    -- Also check for AND/OR/NOT keywords (case insensitive)
+    local keywords = {"%sAND%s", "%sOR%s", "%sNOT%s"}
+    for _, kw in ipairs(keywords) do
+      local search_start = 1
+      while true do
+        local pos = text:upper():find(kw, search_start)
+        if not pos then break end
+        if pos > last_pos then
+          last_pos = pos + #kw - 1
+        end
+        search_start = pos + 1
+      end
+    end
+    return last_pos
+  end
   
-  -- Check if we're typing a quoted DB name (after " but before closing ")
-  local is_in_db_name = trimmed:match('"[%w_]*$') ~= nil
+  local last_op_pos = find_last_operator_pos(line_before_cursor)
+  if last_op_pos > 0 then
+    active_portion = line_before_cursor:sub(last_op_pos):gsub("^%s+", "")
+  end
+
+  -- Check for "DBName" pattern (quoted DB name access with dot) - in active portion only
+  local db_member_pattern = active_portion:match('"([%w_]+)"%.([%w_.]*)')
   
-  -- Check for partial DB name like "HmiData (unclosed quote)
-  local partial_db_match = trimmed:match('"([%w_]+)$')
-  local is_partial_db = partial_db_match ~= nil and trimmed:match('"[^"]*$') ~= nil
+  -- Check if we're typing a quoted DB name (after " but before closing ") - in active portion
+  local is_in_db_name = active_portion:match('"[%w_]*$') ~= nil
   
-  -- Check if after a colon followed by quote (type declaration context)
+  -- Check for partial DB name like "HmiData (unclosed quote) - in active portion
+  local partial_db_match = active_portion:match('"([%w_]+)$')
+  local is_partial_db = partial_db_match ~= nil and active_portion:match('"[^"]*$') ~= nil
+  
+  -- Check if after a colon followed by quote (type declaration context) - use full trimmed line
   local is_after_colon_quote = trimmed:match(':%s*"$') ~= nil
   
-  -- Check if cursor is right after a closed quoted DB name (before dot)
-  local after_closed_db = trimmed:match('"([%w_]+)"%s*%.') ~= nil
+  -- Check if cursor is right after a closed quoted DB name (before dot) - in active portion
+  local after_closed_db = active_portion:match('"([%w_]+)"%s*%.') ~= nil
   
   if db_member_pattern or after_closed_db then
     local db_parser = require("scl.db_parser")
-    local db_name = trimmed:match('"([%w_]+)"')
+    local db_name = active_portion:match('"([%w_]+)"')
     
     if db_name then
       local db = db_parser.get_db(db_name)
       if db then
-        local path = trimmed:match('"[^"]+%"%.([%w_.]*)')
+        local path = active_portion:match('"[^"]+%"%.([%w_.]*)')
         
         -- Resolve nested path through DB members
         local current_type = nil
@@ -230,7 +270,7 @@ function M:get_completions(context, callback)
           end
           
           if not found then
-            wrapped_callback({ items = {} })
+            callback({ items = {}, is_incomplete_backward = false, is_incomplete_forward = false })
             return
           end
         end
@@ -239,8 +279,7 @@ function M:get_completions(context, callback)
         if path and path ~= "" and path:match("%.$") then
           -- User wants members of the last type
         elseif path and path ~= "" and not path:match("%.$") then
-          -- User is typing a member name, don't show completions yet
-          wrapped_callback({ items = {} })
+          callback({ items = {}, is_incomplete_backward = false, is_incomplete_forward = false })
           return
         end