refactor: use regex instead of treesitter to be compatible with neovim nightly

Author: rcasia

lua/neotest-java/util/resolve_package_name.lua

@@ -1,38 +1,23 @@
 local read_file = require("neotest-java.util.read_file")
 
-local PACKAGE_QUERY = [[
-  ((package_declaration (scoped_identifier) @package.name))
-  ((package_declaration (identifier) @package.name))
-]]
-
 ---Resolve the Java package name from a file.
 ---Returns "" if no package declaration is present.
 ---@param filename string
 ---@return string
 local function resolve_package_name(filename)
-	local function find_in_text(raw_query, content)
-		local query = vim.treesitter.query.parse("java", raw_query)
-		local lang_tree = vim.treesitter.get_string_parser(content, "java")
-		local root = lang_tree:parse()[1]:root()
-
-		local result = {}
-		for _, node in query:iter_captures(root, content, 0, -1) do
-			result[#result + 1] = vim.treesitter.get_node_text(node, content)
-		end
-		return result
-	end
-
 	local ok, content = pcall(function()
 		return read_file(filename)
 	end)
 	if not ok then
 		error(string.format("file does not exist: %s", filename))
 	end
 
-	local package_lines = find_in_text(PACKAGE_QUERY, content)
-	local package_name = (package_lines and package_lines[1]) or ""
-
-	return package_name
+	-- Match: package com.example.foo;
+	-- capture com.example.foo into %1
+	local pkg = content:match("[\r\n]^%s*package%s+([%w_%.]+)%s*;%s*[\r\n]")
+		or content:match("^%s*package%s+([%w_%.]+)%s*;") -- in case it's on the very first line
+		or content:match("\n%s*package%s+([%w_%.]+)%s*;") -- general fallback
+	return pkg or ""
 end
 
 return resolve_package_name