refactor(treesitter): move some logic into functions

runtime/lua/vim/treesitter/highlighter.lua

@@ -252,6 +252,44 @@ function TSHighlighter:get_query(lang)
   return self._queries[lang]
 end
 
+--- @param match table<integer,TSNode[]>
+--- @param bufnr integer
+--- @param capture integer
+--- @param metadata vim.treesitter.query.TSMetadata
+--- @return string?
+local function get_url(match, bufnr, capture, metadata)
+  ---@type string|number|nil
+  local url = metadata[capture] and metadata[capture].url
+
+  if not url or type(url) == 'string' then
+    return url
+  end
+
+  if not match or not match[url] then
+    return
+  end
+
+  -- Assume there is only one matching node. If there is more than one, take the URL
+  -- from the first.
+  local other_node = match[url][1]
+
+  return vim.treesitter.get_node_text(other_node, bufnr, {
+    metadata = metadata[url],
+  })
+end
+
+--- @param capture_name string
+--- @return boolean?, integer
+local function get_spell(capture_name)
+  if capture_name == 'spell' then
+    return true, 0
+  elseif capture_name == 'nospell' then
+    -- Give nospell a higher priority so it always overrides spell captures.
+    return false, 1
+  end
+  return nil, 0
+end
+
 ---@param self vim.treesitter.highlighter
 ---@param buf integer
 ---@param line integer
@@ -284,37 +322,17 @@ local function on_line_impl(self, buf, line, is_spell_nav)
 
       for capture, nodes in pairs(match or {}) do
         local capture_name = state.highlighter_query:query().captures[capture]
-        local spell = nil ---@type boolean?
+        local spell, spell_pri_offset = get_spell(capture_name)
-        if capture_name == 'spell' then
-          spell = true
-        elseif capture_name == 'nospell' then
-          spell = false
-        end
 
         local hl = state.highlighter_query:get_hl_from_capture(capture)
 
-        -- Give nospell a higher priority so it always overrides spell captures.
-        local spell_pri_offset = capture_name == 'nospell' and 1 or 0
-
         -- The "priority" attribute can be set at the pattern level or on a particular capture
         local priority = (
           tonumber(metadata.priority or metadata[capture] and metadata[capture].priority)
           or vim.highlight.priorities.treesitter
         ) + spell_pri_offset
 
-        local url = metadata[capture] and metadata[capture].url ---@type string|number|nil
+        local url = get_url(match, buf, capture, metadata)
-        if type(url) == 'number' then
-          if match and match[url] then
-            -- Assume there is only one matching node. If there is more than one, take the URL
-            -- from the first.
-            local other_node = match[url][1]
-            url = vim.treesitter.get_node_text(other_node, buf, {
-              metadata = metadata[url],
-            })
-          else
-            url = nil
-          end
-        end
 
         -- The "conceal" attribute can be set at the pattern level or on a particular capture
         local conceal = metadata.conceal or metadata[capture] and metadata[capture].conceal