Add predicates module

lua/nvim-treesitter/query.lua

@@ -2,6 +2,7 @@ local api = vim.api
 local ts = vim.treesitter
 local utils = require'nvim-treesitter.utils'
 local parsers = require'nvim-treesitter.parsers'
+local predicates = require'nvim-treesitter.query_predicates'
 
 local M = {}
 
@@ -129,7 +130,7 @@ function M.iter_prepared_matches(query, qnode, bufnr, start_row, end_row)
 
   local matches = query:iter_matches(qnode, bufnr, start_row, end_row)
 
-  return function()
+  local function iterator()
     local pattern, match = matches()
     if pattern ~= nil then
       local prepared_match = {}
@@ -147,15 +148,25 @@ function M.iter_prepared_matches(query, qnode, bufnr, start_row, end_row)
       local preds = query.info.patterns[pattern]
       if preds then
         for _, pred in pairs(preds) do
+          -- functions
           if pred[1] == "set!" and type(pred[2]) == "string" then
             insert_to_path(prepared_match, split(pred[2]), pred[3])
           end
+
+          -- predicates
+          if type(pred[1]) == 'string' then
+            if not predicates.check_predicate(query, prepared_match, pred) or
+               not predicates.check_negated_predicate(query, prepared_match, pred) then
+              return iterator()
+            end
+          end
         end
       end
 
       return prepared_match
     end
   end
+  return iterator
 end
 
 --- Return all nodes corresponding to a specific capture path (like @definition.var, @reference.type)