fix(snippets): filter out incompatible builtin snippets

Skip early incompatible builtin snippets using LSP grammar.

Closes #2028

Author: soifou

lua/blink/cmp/sources/snippets/utils.lua

@@ -38,12 +38,35 @@ function utils.safe_parse(input)
   return parsed
 end
 
+---@param body string|string[]
+---@return string|string[]|nil
+function utils.parse_body(body)
+  if type(body) == 'table' then body = table.concat(body, '\n') end
+
+  -- TODO: Try to fix them, whenever it's possible
+
+  -- Escape \ in options
+  body = body:gsub(
+    '(%${%d+|)(.-)(|})',
+    function(start, options, ending) return start .. options:gsub('\\', '\\\\') .. ending end
+  )
+
+  -- Now validate the snippet, discard if parsing fails
+  if not utils.safe_parse(body) then return nil end
+
+  if body:find('\n') then body = vim.split(body, '\n', { plain = true }) end
+
+  return body
+end
+
 ---@type fun(snippet: blink.cmp.Snippet, fallback: string): table
 function utils.read_snippet(snippet, fallback)
   local snippets = {}
   local prefix = snippet.prefix or fallback
   local description = snippet.description or fallback
-  local body = snippet.body
+
+  local body = utils.parse_body(snippet.body)
+  if body == nil then return {} end
 
   if type(description) == 'table' then description = vim.fn.join(description, '') end
 
@@ -90,25 +113,4 @@ function utils.add_current_line_indentation(text)
   return table.concat(lines, '\n')
 end
 
-function utils.get_tab_stops(snippet)
-  local expanded_snippet = require('blink.cmp.sources.snippets.utils').safe_parse(snippet)
-  if not expanded_snippet then return end
-
-  local tabstops = {}
-  local grammar = require('vim.lsp._snippet_grammar')
-  local line = 1
-  local character = 1
-  for _, child in ipairs(expanded_snippet.data.children) do
-    local lines = tostring(child) == '' and {} or vim.split(tostring(child), '\n')
-    line = line + math.max(#lines - 1, 0)
-    character = #lines == 0 and character or #lines > 1 and #lines[#lines] or (character + #lines[#lines])
-    if child.type == grammar.NodeType.Placeholder or child.type == grammar.NodeType.Tabstop then
-      table.insert(tabstops, { index = child.data.tabstop, line = line, character = character })
-    end
-  end
-
-  table.sort(tabstops, function(a, b) return a.index < b.index end)
-  return tabstops
-end
-
 return utils