Stringify when a non-object is passed to PP#text

If a nested object is passed to #pp, it may be sometimes passed to the #text
method as an object without being stringified.

This is fixed on the Ruby main repository;
ruby/ruby@433a3be
but it was a bug of Ripper so still needs this workaround for using irb
as a gem on Ruby 3.0.0 or earlier.

lib/irb/color_printer.rb

@@ -10,12 +10,17 @@ def self.pp(obj, out = $>, width = 79)
       out
     end
 
-    def text(str, width = str.length)
+    def text(str, width = nil)
       case str
       when /\A#</, '=', '>'
-        super(Color.colorize(str, [:GREEN]), width)
+        super(Color.colorize(str, [:GREEN]), str.length)
       else
-        super(Color.colorize_code(str, ignore_error: true), width)
+        begin
+          super(Color.colorize_code(str, ignore_error: true), str.length)
+        rescue TypeError
+          str = str.inspect
+          super(Color.colorize(str, [:GREEN]), str.length)
+        end
       end
     end
   end

test/irb/test_color.rb

@@ -1,6 +1,7 @@
 # frozen_string_literal: false
 require 'test/unit'
 require 'irb/color'
+require 'irb/color_printer'
 require 'rubygems'
 require 'stringio'
 
@@ -152,6 +153,19 @@ def test_colorize_code_complete_false
       end
     end
 
+    def test_color_printer
+      unless ripper_lexer_scan_supported?
+        skip 'Ripper::Lexer#scan is supported in Ruby 2.7+'
+      end
+      {
+        1 => "#{BLUE}#{BOLD}1#{CLEAR}",
+        Ripper::Lexer.new('1').scan => "[#{GREEN}#<Ripper::Lexer::Elem:#{CLEAR} on_int@1:0 #{GREEN}END#{CLEAR} token: #{RED}#{BOLD}\"#{CLEAR}#{RED}1#{CLEAR}#{RED}#{BOLD}\"#{CLEAR}#{GREEN}>#{CLEAR}]",
+      }.each do |object, result|
+        actual = with_term { IRB::ColorPrinter.pp(object, '') }
+        assert_equal(result, actual, "Case: IRB::ColorPrinter.pp(#{object.inspect}, '')")
+      end
+    end
+
     def test_inspect_colorable
       {
         1 => true,
@@ -184,6 +198,10 @@ def complete_option_supported?
       Gem::Version.new(RUBY_VERSION) >= Gem::Version.new('2.7.0')
     end
 
+    def ripper_lexer_scan_supported?
+      Gem::Version.new(RUBY_VERSION) >= Gem::Version.new('2.7.0')
+    end
+
     def with_term
       stdout = $stdout
       io = StringIO.new