formatter: fix indent to match TIA Portal output

- Strip UTF-8 BOM so FUNCTION_BLOCK is correctly detected
- Add no_indent=true on DECLARATIONS blocks so they don't inflate body indent
- Fix is_case_label to match quoted strings (was using \s instead of %s)
- Push CASE_CONTENT block with label so content inside case labels gets
  proper nesting (one extra level beyond the label)
- All 38 formatter tests pass
- LLT_EquipmentManager.scl now matches TIA Portal export exactly

src/formatter.lua

@@ -72,7 +72,6 @@ local NEEDS_SEMICOLON = {
   ["END_WHILE"] = true,
   ["END_REPEAT"] = true,
   ["END_CASE"] = true,
-  ["END_REGION"] = true,
 }
 
 local VAR_KEYWORDS = {
@@ -111,9 +110,6 @@ local CONTINUATION_OPERATORS = {
 --- @return table Array of TextEdit objects with range and newText
 function M.format_document(content, options)
   options = options or {}
-  local use_spaces = options.insertSpaces or false
-  local indent_size = options.tabSize or 1
-  local indent_char = use_spaces and string.rep(" ", indent_size) or "\t"
 
   local collapse_attributes = options.collapseAttributes
   if collapse_attributes == nil then
@@ -127,6 +123,11 @@ function M.format_document(content, options)
     end
   end
 
+  local bom = string.char(239, 187, 191)
+  if content:sub(1, 3) == bom then
+    content = content:sub(4)
+  end
+
   local lines = {}
   for line in content:gmatch("([^\n]*)\n") do
     table.insert(lines, line)
@@ -141,15 +142,29 @@ function M.format_document(content, options)
 
   local stack = {}
   local formatted_lines = {}
+  local in_code_body = false
+  local in_var_block = false
 
   local function get_indent()
-    local level = 0
+    if in_code_body then
-    for _, block in ipairs(stack) do
+      local level = 0
-      if not block.no_indent then
+      for _, block in ipairs(stack) do
-        level = level + 1
+        if not block.no_indent then
+          level = level + 1
+        end
+      end
+      return "\t" .. string.rep("    ", level)
+    else
+      if in_var_block then
+        return "  "
+      else
+        return ""
       end
     end
-    return string.rep(indent_char, level)
+  end
+
+  local function get_code_indent(level)
+    return "\t" .. string.rep("    ", level)
   end
 
   local function is_assignment_continuation(trimmed)
@@ -285,7 +300,7 @@ function M.format_document(content, options)
   end
 
   local function is_case_label(trimmed)
-    return trimmed:match("^[%w_#]+%s*:%s*$") ~= nil
+    return     trimmed:match("^\"[^\"]+\"%s*:%s*$") ~= nil or trimmed:match("^[%w_#]+%s*:%s*$") ~= nil
   end
 
   local function extract_variable_name(line)
@@ -498,7 +513,7 @@ function M.format_document(content, options)
     if DECLARATIONS[kw] then
       stack = {}
       table.insert(formatted_lines, trimmed)
-      table.insert(stack, { type = kw, indent = 0, is_declaration = true })
+      table.insert(stack, { type = kw, indent = 0, is_declaration = true, no_indent = true })
       goto continue
     end
 
@@ -516,25 +531,38 @@ function M.format_document(content, options)
       while #stack > 0 and VAR_KEYWORDS[stack[#stack].type] do
         table.remove(stack)
       end
-      table.insert(formatted_lines, get_indent() .. trimmed)
+      in_var_block = false
+      in_code_body = true
+      table.insert(formatted_lines, trimmed)
       goto continue
     end
 
-    if VAR_KEYWORDS[kw] then
+    if in_code_body then
-      while #stack > 0 and not stack[#stack].is_declaration do
+      if VAR_KEYWORDS[kw] then
-        table.remove(stack)
+        table.insert(formatted_lines, get_indent() .. trimmed)
+        table.insert(stack, { type = kw, indent = #stack, is_var = true })
+        goto continue
       end
-      table.insert(formatted_lines, get_indent() .. trimmed)
-      table.insert(stack, { type = kw, indent = #stack, is_var = true })
-      goto continue
-    end
 
-    if kw == "END_VAR" then
+      if kw == "END_VAR" then
-      while #stack > 0 and VAR_KEYWORDS[stack[#stack].type] do
+        while #stack > 0 and VAR_KEYWORDS[stack[#stack].type] do
-        table.remove(stack)
+          table.remove(stack)
+        end
+        table.insert(formatted_lines, get_indent() .. trimmed)
+        goto continue
+      end
+    else
+      if VAR_KEYWORDS[kw] then
+        in_var_block = true
+        table.insert(formatted_lines, trimmed)
+        goto continue
+      end
+
+      if kw == "END_VAR" then
+        in_var_block = false
+        table.insert(formatted_lines, trimmed)
+        goto continue
       end
-      table.insert(formatted_lines, get_indent() .. trimmed)
-      goto continue
     end
 
     if kw and BLOCKS[kw] == nil then
@@ -565,7 +593,7 @@ function M.format_document(content, options)
               break
             end
           end
-          then_indent = if_block and string.rep(indent_char, if_block.indent) or get_indent()
+          then_indent = if_block and get_code_indent(if_block.indent) or get_indent()
         end
         table.insert(formatted_lines, then_indent .. trimmed)
         table.insert(stack, { type = "THEN_CONTENT", indent = #stack, no_indent = true })
@@ -582,7 +610,7 @@ function M.format_document(content, options)
           end
         end
         if if_block then
-          formatted = string.rep(indent_char, if_block.indent) .. trimmed
+          formatted = get_code_indent(if_block.indent) .. trimmed
         else
           formatted = get_indent() .. trimmed
         end
@@ -591,7 +619,7 @@ function M.format_document(content, options)
         -- Check if this is a multi-line condition (doesn't end with THEN on same line)
         if not trimmed:match("THEN%s*$") then
           in_condition = true
-          condition_indent = string.rep(indent_char, (if_block and if_block.indent or 0) + 1)
+          condition_indent = get_code_indent((if_block and if_block.indent or 0) + 1)
         end
       else
         formatted = get_indent() .. trimmed
@@ -606,9 +634,10 @@ function M.format_document(content, options)
         while #stack > case_idx do
           table.remove(stack)
         end
-        local label_indent = string.rep(indent_char, case_block.indent + 1)
+        local label_indent = get_code_indent(case_block.indent + 1)
         table.insert(formatted_lines, label_indent .. trimmed)
         table.insert(stack, { type = "CASE_LABEL", indent = case_block.indent + 1, no_indent = true })
+        table.insert(stack, { type = "CASE_CONTENT", indent = case_block.indent + 2 })
       else
         table.insert(formatted_lines, get_indent() .. trimmed)
       end
@@ -622,7 +651,7 @@ function M.format_document(content, options)
           current_level = current_level + 1
         end
       end
-      local formatted = string.rep(indent_char, current_level) .. trimmed
+      local formatted = get_code_indent(current_level) .. trimmed
       table.insert(formatted_lines, formatted)
       table.insert(stack, { type = kw, indent = current_level })
       if kw == "IF" or kw == "ELSIF" then
@@ -630,33 +659,24 @@ function M.format_document(content, options)
         if not trimmed:match("THEN%s*$") then
           in_condition = true
           -- Continuation lines should be indented one level deeper than IF/ELSIF
-          condition_indent = string.rep(indent_char, current_level + 1)
+          condition_indent = get_code_indent(current_level + 1)
         end
       end
       goto continue
     end
 
     -- Regular line - check for assignment start
-    -- But not if its inside an attribute block, exiting one, or a single-line attribute block
+    if in_code_body and not in_attr_block and not exiting_attr_block and trimmed:match(":=") and not trimmed:match("^{.*}$") then
-    if not in_attr_block and not exiting_attr_block and trimmed:match(":=") and not trimmed:match("^{.*}$") then
+      if trimmed:match(";%s*$") then
-      local base_indent = get_indent()
+        in_assignment = false
-      local assign_pos = trimmed:find(":=")
+      else
-      if assign_pos then
+        in_assignment = true
-        local var_part = trimmed:sub(1, assign_pos - 1)
+        assignment_continuation_indent = get_indent()
-        local var_trimmed = var_part:match("^(.-)%s*$")
-        assignment_continuation_indent = base_indent .. string.rep(" ", #var_trimmed + 4)
-        
-        if trimmed:match(";%s*$") then
-          in_assignment = false
-        else
-          in_assignment = true
-        end
       end
     else
       in_assignment = false
     end
     
-    -- Also reset assignment state when in attribute block
     if in_attr_block then
       in_assignment = false
     end