From 3b5664230299273dd27966843de61c589382d895 Mon Sep 17 00:00:00 2001
From: Earlopain <14981592+Earlopain@users.noreply.github.com>
Date: Wed, 14 Jan 2026 10:37:20 +0100
Subject: [PATCH] Use the prism ripper translator if available

Since ruby 3.4, prism is the default parser. There is talk about deprecating ripper in https://bugs.ruby-lang.org/issues/21827.

In order to make possible, bundled/default gems need to not use ripper. Prism actually contains a compatibility layer which can be used for that.
It translates the native prism ast into the format that ripper would return.

So, instead of rewriting the whole logic to use native prism, it can just use the compatiblity layer.

I would be open trying to port it to prism without the compatiblity layer if you prefer. That would entail keeping two implementations around, since prism is only able to parse ruby 3.3+ syntax. Let me know what you think
---
 lib/power_assert/parser.rb | 15 ++++++++++++---
 test/test_helper.rb        |  1 -
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/lib/power_assert/parser.rb b/lib/power_assert/parser.rb
index c8ad988..399e9f7 100644
--- a/lib/power_assert/parser.rb
+++ b/lib/power_assert/parser.rb
@@ -1,9 +1,18 @@
-require 'ripper'
-
 module PowerAssert
   class Parser
     Ident = Struct.new(:type, :name, :column)
 
+    # Prism is the default parser since Ruby 3.4. It contains a compatibility layer
+    # with ripper that returns data in the same format that ripper would.
+    RipperImplementation = begin
+      gem "prism", ">= 1.0.0"
+      require "prism"
+      Prism::Translation::Ripper
+    rescue LoadError
+      require "ripper"
+      Ripper
+    end
+
     attr_reader :line, :path, :lineno, :binding
 
     def initialize(line, path, lineno, binding, assertion_method_name = nil, assertion_proc = nil)
@@ -18,7 +27,7 @@ def initialize(line, path, lineno, binding, assertion_method_name = nil, asserti
     end
 
     def idents
-      @idents ||= extract_idents(Ripper.sexp(@line_for_parsing))
+      @idents ||= extract_idents(RipperImplementation.sexp(@line_for_parsing))
     end
 
     def call_paths
diff --git a/test/test_helper.rb b/test/test_helper.rb
index 5cc39ef..4c1d742 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -14,7 +14,6 @@
 
 require 'test/unit'
 require 'power_assert'
-require 'ripper'
 
 module PowerAssertTestHelper
   class << self