From 5d815105c753073f0f9ec5582bb3e18250379e83 Mon Sep 17 00:00:00 2001
From: sue445 <sue445@sue445.net>
Date: Fri, 2 May 2025 14:15:36 +0900
Subject: [PATCH 1/5] Add prism

---
 rspec-parameterized-core.gemspec | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/rspec-parameterized-core.gemspec b/rspec-parameterized-core.gemspec
index 74b5c9d..bc1c681 100644
--- a/rspec-parameterized-core.gemspec
+++ b/rspec-parameterized-core.gemspec
@@ -32,11 +32,16 @@ I was inspired by [udzura's mock](https://gist.github.com/1881139).}
   spec.executables = spec.files.grep(%r{\Aexe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
 
+  spec.add_dependency "rspec", ">= 2.13", "< 4"
+
+  # parser dependencies
   spec.add_dependency "parser"
   spec.add_dependency "proc_to_ast", ">= 0.2.0"
-  spec.add_dependency "rspec", ">= 2.13", "< 4"
   spec.add_dependency "unparser"
 
+  # prism dependencies
+  spec.add_dependency "prism"
+
   spec.add_development_dependency "rake", ">= 12.0.0"
 
   # For more information and examples about making a new gem, check out our

From ed84c589145e82af74a299edbb16691ce6bb5d2a Mon Sep 17 00:00:00 2001
From: sue445 <sue445@sue445.net>
Date: Fri, 2 May 2025 15:32:40 +0900
Subject: [PATCH 2/5] Add rspec-its

---
 rspec-parameterized-core.gemspec | 1 +
 spec/spec_helper.rb              | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/rspec-parameterized-core.gemspec b/rspec-parameterized-core.gemspec
index bc1c681..8bad8af 100644
--- a/rspec-parameterized-core.gemspec
+++ b/rspec-parameterized-core.gemspec
@@ -43,6 +43,7 @@ I was inspired by [udzura's mock](https://gist.github.com/1881139).}
   spec.add_dependency "prism"
 
   spec.add_development_dependency "rake", ">= 12.0.0"
+  spec.add_development_dependency "rspec-its"
 
   # For more information and examples about making a new gem, check out our
   # guide at: https://bundler.io/guides/creating_gem.html
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 1bbfbe7..f14aac6 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1,5 +1,7 @@
 require 'rspec-parameterized-core'
 
+require 'rspec/its'
+
 RSpec.configure do |config|
   config.treat_symbols_as_metadata_keys_with_true_values = true
   config.run_all_when_everything_filtered = true

From 62f0b659b1bdc51f8fa8a58bebb7e5d7c78140ca Mon Sep 17 00:00:00 2001
From: sue445 <sue445@sue445.net>
Date: Fri, 2 May 2025 15:32:58 +0900
Subject: [PATCH 3/5] Move to_raw_source to CompositeParser

---
 lib/rspec/parameterized/core.rb               | 13 ++---
 .../parameterized/core/composite_parser.rb    | 51 +++++++++++++++++++
 lib/rspec/parameterized/core/errors.rb        |  9 ++++
 lib/rspec/parameterized/core/lazy_arg.rb      |  4 +-
 .../core/composite_parser_spec.rb             | 33 ++++++++++++
 5 files changed, 100 insertions(+), 10 deletions(-)
 create mode 100644 lib/rspec/parameterized/core/composite_parser.rb
 create mode 100644 lib/rspec/parameterized/core/errors.rb
 create mode 100644 spec/rspec/parameterized/core/composite_parser_spec.rb

diff --git a/lib/rspec/parameterized/core.rb b/lib/rspec/parameterized/core.rb
index ad3aa38..e4738c7 100644
--- a/lib/rspec/parameterized/core.rb
+++ b/lib/rspec/parameterized/core.rb
@@ -1,9 +1,8 @@
 require "rspec/parameterized/core/version"
-require 'parser'
-require 'unparser'
-require 'proc_to_ast'
 require 'rspec/parameterized/core/helper_methods'
 require 'rspec/parameterized/core/example_helper_methods'
+require 'rspec/parameterized/core/errors'
+require 'rspec/parameterized/core/composite_parser'
 
 module RSpec
   module Parameterized
@@ -143,11 +142,9 @@ def define_cases(parameter, *args, &block)
         end
 
         def params_inspect(obj)
-          begin
-            obj.is_a?(Proc) ? obj.to_raw_source : obj.inspect
-          rescue Parser::SyntaxError
-            return obj.inspect
-          end
+          RSpec::Parameterized::Core::CompositeParser.to_raw_source(obj)
+        rescue ParserSyntaxError
+          return obj.inspect
         end
 
         def set_verbose_parameters(&block)
diff --git a/lib/rspec/parameterized/core/composite_parser.rb b/lib/rspec/parameterized/core/composite_parser.rb
new file mode 100644
index 0000000..e99c471
--- /dev/null
+++ b/lib/rspec/parameterized/core/composite_parser.rb
@@ -0,0 +1,51 @@
+module RSpec
+  module Parameterized
+    module Core
+      # Proxy class for parser and prism
+      module CompositeParser
+        # @param obj [Object]
+        # @return [String]
+        # @raise [RSpec::Parameterized::Core::ParserSyntaxError]
+        def self.to_raw_source(obj)
+          return to_raw_source_with_prism(obj) if use_prism?
+
+          to_raw_source_with_parser(obj)
+        end
+
+        # Whether use parser or prism
+        #
+        # @return [true] Use prism
+        # @return [false] Use parser
+        def self.use_prism?
+          Gem::Version.new(RUBY_VERSION) >= Gem::Version.new("3.4.0")
+        end
+
+        # @param obj [Object]
+        # @return [String]
+        # @raise [RSpec::Parameterized::Core::ParserSyntaxError]
+        def self.to_raw_source_with_parser(obj)
+          obj.is_a?(Proc) ? obj.to_raw_source : obj.inspect
+        rescue Parser::SyntaxError => e
+          raise ParserSyntaxError
+        end
+        private_class_method :to_raw_source_with_parser
+
+        # @param obj [Object]
+        # @return [String]
+        def self.to_raw_source_with_prism(obj)
+          # TODO: Impl
+          raise "TODO: Impl"
+        end
+        private_class_method :to_raw_source_with_prism
+      end
+    end
+  end
+end
+
+if RSpec::Parameterized::Core::CompositeParser.use_prism?
+  require 'prism'
+else
+  require 'parser'
+  require 'unparser'
+  require 'proc_to_ast'
+end
diff --git a/lib/rspec/parameterized/core/errors.rb b/lib/rspec/parameterized/core/errors.rb
new file mode 100644
index 0000000..90da09f
--- /dev/null
+++ b/lib/rspec/parameterized/core/errors.rb
@@ -0,0 +1,9 @@
+module RSpec
+  module Parameterized
+    module Core
+      class Error < StandardError; end
+
+      class ParserSyntaxError < Error; end
+    end
+  end
+end
diff --git a/lib/rspec/parameterized/core/lazy_arg.rb b/lib/rspec/parameterized/core/lazy_arg.rb
index 5d77e70..5d96cab 100644
--- a/lib/rspec/parameterized/core/lazy_arg.rb
+++ b/lib/rspec/parameterized/core/lazy_arg.rb
@@ -11,8 +11,8 @@ def apply(obj)
         end
 
         def inspect
-          "#{@block.to_raw_source}"
-        rescue Parser::SyntaxError
+          CompositeParser.to_raw_source(@block)
+        rescue ParserSyntaxError
           super.inspect
         end
       end
diff --git a/spec/rspec/parameterized/core/composite_parser_spec.rb b/spec/rspec/parameterized/core/composite_parser_spec.rb
new file mode 100644
index 0000000..ff9a5f7
--- /dev/null
+++ b/spec/rspec/parameterized/core/composite_parser_spec.rb
@@ -0,0 +1,33 @@
+describe RSpec::Parameterized::Core::CompositeParser do
+  describe ".to_raw_source" do
+    subject { RSpec::Parameterized::Core::CompositeParser.to_raw_source(arg) }
+
+    context "arg is not proc" do
+      let(:arg) do
+        123
+      end
+
+      it { should eq "123" }
+    end
+
+    context "arg is proc" do
+      context "simple case" do
+        let(:arg) do
+          ->(a) { a + 1 }
+        end
+
+        it { should eq "->(a) { a + 1 }" }
+        its(:encoding) { should eq Encoding::UTF_8 }
+      end
+
+      context "arg is multibyte characters" do
+        let(:arg) do
+          ->(a) { a + "ほげほげ" }
+        end
+
+        it { should eq '->(a) { a + "ほげほげ" }' }
+        its(:encoding) { should eq Encoding::UTF_8 }
+      end
+    end
+  end
+end

From 0f99a639fa890f39df348598464ea909721b5297 Mon Sep 17 00:00:00 2001
From: sue445 <sue445@sue445.net>
Date: Fri, 2 May 2025 15:49:15 +0900
Subject: [PATCH 4/5] Impl to_raw_source_with_prism

---
 .../parameterized/core/composite_parser.rb    | 28 +++++++++++++++++--
 1 file changed, 26 insertions(+), 2 deletions(-)

diff --git a/lib/rspec/parameterized/core/composite_parser.rb b/lib/rspec/parameterized/core/composite_parser.rb
index e99c471..22efd97 100644
--- a/lib/rspec/parameterized/core/composite_parser.rb
+++ b/lib/rspec/parameterized/core/composite_parser.rb
@@ -33,10 +33,34 @@ def self.to_raw_source_with_parser(obj)
         # @param obj [Object]
         # @return [String]
         def self.to_raw_source_with_prism(obj)
-          # TODO: Impl
-          raise "TODO: Impl"
+          return obj.inspect unless obj.is_a?(Proc)
+
+          filename, linenum = obj.source_location
+          ast = parse_with_prism(filename, linenum)
+
+          return "" unless ast
+
+          ast.source.source.strip
         end
         private_class_method :to_raw_source_with_prism
+
+        # @param filename [String]
+        # @param linenum [Integer]
+        #
+        # @return [Prism::ParseResult,nil]
+        def self.parse_with_prism(filename, linenum)
+          buf = []
+          File.open(filename, "rb").each_with_index do |line, index|
+            next if index < linenum - 1
+            buf << line
+
+            ret = Prism.parse(buf.join("\n"))
+            return ret if ret.success?
+          end
+
+          nil
+        end
+        private_class_method :parse_with_prism
       end
     end
   end

From 0d91d2ab831b32abdd0a3f202545544c3440981a Mon Sep 17 00:00:00 2001
From: sue445 <sue445@sue445.net>
Date: Fri, 2 May 2025 16:46:55 +0900
Subject: [PATCH 5/5] Fix when multiple line

---
 lib/rspec/parameterized/core/composite_parser.rb     |  2 +-
 .../parameterized/core/composite_parser_spec.rb      | 12 ++++++++++++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/lib/rspec/parameterized/core/composite_parser.rb b/lib/rspec/parameterized/core/composite_parser.rb
index 22efd97..67075e3 100644
--- a/lib/rspec/parameterized/core/composite_parser.rb
+++ b/lib/rspec/parameterized/core/composite_parser.rb
@@ -54,7 +54,7 @@ def self.parse_with_prism(filename, linenum)
             next if index < linenum - 1
             buf << line
 
-            ret = Prism.parse(buf.join("\n"))
+            ret = Prism.parse(buf.join)
             return ret if ret.success?
           end
 
diff --git a/spec/rspec/parameterized/core/composite_parser_spec.rb b/spec/rspec/parameterized/core/composite_parser_spec.rb
index ff9a5f7..6a3087e 100644
--- a/spec/rspec/parameterized/core/composite_parser_spec.rb
+++ b/spec/rspec/parameterized/core/composite_parser_spec.rb
@@ -28,6 +28,18 @@
         it { should eq '->(a) { a + "ほげほげ" }' }
         its(:encoding) { should eq Encoding::UTF_8 }
       end
+
+      context "multiple lines" do
+        let(:arg) do
+          ->(a) {
+            a +
+              1
+          }
+        end
+
+        it { should eq "->(a) {\n            a +\n              1\n          }" }
+        its(:encoding) { should eq Encoding::UTF_8 }
+      end
     end
   end
 end