From fa09afb15c9cf901d84e2963b86c4c7a7d0e104e Mon Sep 17 00:00:00 2001
From: Kevin Newton <kddnewton@gmail.com>
Date: Wed, 28 Jan 2026 21:23:15 -0500
Subject: [ruby/prism] Support `version: "nearest"`.

This clamps to supported versions based on the current Ruby version.

https://github.com/ruby/prism/commit/eb63748e8b
---
 lib/prism/ffi.rb | 24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)

(limited to 'lib')

diff --git a/lib/prism/ffi.rb b/lib/prism/ffi.rb
index d4c9d60c9a..57d878a33f 100644
--- a/lib/prism/ffi.rb
+++ b/lib/prism/ffi.rb
@@ -423,10 +423,26 @@ module Prism
 
     # Return the value that should be dumped for the version option.
     def dump_options_version(version)
-      current = version == "current"
+      checking =
+        case version
+        when "current"
+          RUBY_VERSION
+        when "latest"
+          nil
+        when "nearest"
+          if RUBY_VERSION <= "3.3"
+            "3.3"
+          elsif RUBY_VERSION >= "4.1"
+            "4.1"
+          else
+            RUBY_VERSION
+          end
+        else
+          version
+        end
 
-      case current ? RUBY_VERSION : version
-      when nil, "latest"
+      case checking
+      when nil
         0 # Handled in pm_parser_init
       when /\A3\.3(\.\d+)?\z/
         1
@@ -437,7 +453,7 @@ module Prism
       when /\A4\.1(\.\d+)?\z/
         4
       else
-        if current
+        if version == "current"
           raise CurrentVersionError, RUBY_VERSION
         else
           raise ArgumentError, "invalid version: #{version}"
-- 
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