Escape apostrophes in generated snippets

lib/cucumber/glue/snippet.rb

@@ -91,7 +91,7 @@ def typed_pattern
         def to_s
           header = generated_expressions.each_with_index.map do |expr, i|
             prefix = i.zero? ? '' : '# '
-            "#{prefix}#{code_keyword}('#{expr.source}') do#{parameters(expr)}"
+            "#{prefix}#{code_keyword}(#{quoted_expression_source(expr)}) do#{parameters(expr)}"
           end.join("\n")
 
           body = <<~DOC.chomp
@@ -108,6 +108,15 @@ def parameters(expr)
           parameter_names.empty? ? '' : " |#{parameter_names.join(', ')}|"
         end
 
+        def quoted_expression_source(expr)
+          source = expr.source
+
+          return "'#{source.gsub(/\\/) { |char| "\\#{char}" }}'" unless source.include?("'")
+
+          escaped_source = source.gsub(/["\\#]/) { |char| "\\#{char}" }
+          "\"#{escaped_source}\""
+        end
+
         def self.description
           'Cucumber Expressions'
         end

spec/cucumber/glue/snippet_spec.rb

@@ -180,6 +180,39 @@ module Glue
 
           expect(snippet.to_s).to eq(cucumber_output)
         end
+
+        it 'uses double quotes for generated snippets with apostrophes' do
+          @step_text = "Lucy hears Sean's message"
+          cucumber_output = <<~CUKE.chomp
+            Given("Lucy hears Sean's message") do
+              pending # Write code here that turns the phrase above into concrete actions
+            end
+          CUKE
+
+          expect(snippet.to_s).to eq(cucumber_output)
+        end
+
+        it 'escapes backslashes in single quoted snippets' do
+          @step_text = 'Lucy hears trailing \\'
+          cucumber_output = <<~'CUKE'.chomp
+            Given('Lucy hears trailing \\') do
+              pending # Write code here that turns the phrase above into concrete actions
+            end
+          CUKE
+
+          expect(snippet.to_s).to eq(cucumber_output)
+        end
+
+        it 'escapes interpolation markers in double quoted snippets' do
+          @step_text = 'Lucy hears Sean\'s #@message'
+          cucumber_output = <<~'CUKE'.chomp
+            Given("Lucy hears Sean's \#@message") do
+              pending # Write code here that turns the phrase above into concrete actions
+            end
+          CUKE
+
+          expect(snippet.to_s).to eq(cucumber_output)
+        end
       end
     end
   end