call merge instead of dup on Hash where possible (more efficient)

5 files changed, 10 insertions, 10 deletions

diff --git a/lib/asciidoctor/pdf/converter.rb b/lib/asciidoctor/pdf/converter.rb
index b81d043c..7288b329 100644
--- a/lib/asciidoctor/pdf/converter.rb
+++ b/lib/asciidoctor/pdf/converter.rb
@@ -810,7 +810,7 @@ module Asciidoctor
                 node.blocks.each do |child|
                   if child.context == :paragraph
                     child.document.playback_attributes child.attributes
-                    convert_paragraph child, prose_opts.dup
+                    convert_paragraph child, prose_opts.merge
                     prose_opts.delete :first_line_options
                   else
                     # FIXME: this could do strange things if the wrong kind of content shows up
@@ -1926,7 +1926,7 @@ module Asciidoctor
           ink_caption node, labeled: false, end: :bottom if node.title?
           theme_margin :block, :bottom, (next_enclosed_block node)
         else
-          original_attributes = node.attributes.dup
+          original_attributes = node.attributes.merge
           begin
             node.update_attributes 'target' => poster, 'link' => video_path
             convert_image node
@@ -5226,7 +5226,7 @@ module Asciidoctor
         if (@scratch_depth += 1) == 1
           @save_state = {
             catalog: {}.tap {|accum| doc.catalog.each {|k, v| accum[k] = v.dup } },
-            attributes: doc.attributes.dup,
+            attributes: doc.attributes.merge,
           }
         end
       end
diff --git a/lib/asciidoctor/pdf/ext/prawn/images.rb b/lib/asciidoctor/pdf/ext/prawn/images.rb
index 414ae4e9..33e084b1 100644
--- a/lib/asciidoctor/pdf/ext/prawn/images.rb
+++ b/lib/asciidoctor/pdf/ext/prawn/images.rb
@@ -7,7 +7,7 @@ module Asciidoctor
       def image file, opts = {}
         # FIXME: handle case when SVG is an IO object
         if ::String === file
-          if ((opts = opts.dup).delete :format) == 'svg' || (file.downcase.end_with? '.svg')
+          if ((opts = opts.merge).delete :format) == 'svg' || (file.downcase.end_with? '.svg')
             #opts[:enable_file_requests_with_root] = (::File.dirname file) unless opts.key? :enable_file_requests_with_root
             #opts[:enable_web_requests] = allow_uri_read if !(opts.key? :enable_web_requests) && (respond_to? :allow_uri_read)
             #opts[:cache_images] = cache_uri if !(opts.key? :cache_images) && (respond_to? :cache_uri)
diff --git a/lib/asciidoctor/pdf/ext/rouge/formatters/prawn.rb b/lib/asciidoctor/pdf/ext/rouge/formatters/prawn.rb
index 24674175..4ded6d49 100644
--- a/lib/asciidoctor/pdf/ext/rouge/formatters/prawn.rb
+++ b/lib/asciidoctor/pdf/ext/rouge/formatters/prawn.rb
@@ -51,13 +51,13 @@ module Rouge
           linenum = (linenum = opts[:start_line] || 1) > 0 ? linenum : 1
           fragments = []
           line_numbers ? (fragments << (create_linenum_fragment linenum)) : (start_of_line = true)
-          fragments << @highlight_line_fragment.dup if highlight_lines && highlight_lines[linenum]
+          fragments << @highlight_line_fragment.merge if highlight_lines && highlight_lines[linenum]
           tokens.each do |tok, val|
             if val == LF
               fragments << { text: LF }
               linenum += 1
               line_numbers ? (fragments << (create_linenum_fragment linenum)) : (start_of_line = true)
-              fragments << @highlight_line_fragment.dup if highlight_lines && highlight_lines[linenum]
+              fragments << @highlight_line_fragment.merge if highlight_lines && highlight_lines[linenum]
             elsif val.include? LF
               # NOTE: we assume if the fragment ends in a line feed, the intention was to match a line-oriented form
               line_oriented = val.end_with? LF
@@ -72,7 +72,7 @@ module Rouge
                 # NOTE: eagerly append linenum fragment or line highlight if there's a next line
                 linenum += 1
                 line_numbers ? (fragments << (create_linenum_fragment linenum)) : (start_of_line = true)
-                fragments << @highlight_line_fragment.dup if highlight_lines && highlight_lines[linenum]
+                fragments << @highlight_line_fragment.merge if highlight_lines && highlight_lines[linenum]
               end
             else
               if start_of_line
diff --git a/lib/asciidoctor/pdf/formatted_text/source_wrap.rb b/lib/asciidoctor/pdf/formatted_text/source_wrap.rb
index f1230ee9..664e63f5 100644
--- a/lib/asciidoctor/pdf/formatted_text/source_wrap.rb
+++ b/lib/asciidoctor/pdf/formatted_text/source_wrap.rb
@@ -18,11 +18,11 @@ module Asciidoctor
             if (first_fragment = unconsumed[0])[:linenum]
               linenum_text = first_fragment[:text]
               linenum_spacer ||= { text: (NoBreakSpace.encode linenum_text.encoding) + (' ' * (linenum_text.length - 1)), linenum: :spacer }
-              highlight_line = (second_fragment = unconsumed[1])[:highlight] ? second_fragment.dup : nil
+              highlight_line = (second_fragment = unconsumed[1])[:highlight] ? second_fragment.merge : nil
             else # wrapped line
               first_fragment[:text] = first_fragment[:text].lstrip
               @arranger.unconsumed.unshift highlight_line if highlight_line
-              @arranger.unconsumed.unshift linenum_spacer.dup
+              @arranger.unconsumed.unshift linenum_spacer.merge
             end
             @line_wrap.wrap_line \
               document: @document,
diff --git a/lib/asciidoctor/pdf/formatted_text/transform.rb b/lib/asciidoctor/pdf/formatted_text/transform.rb
index 26ba80d0..6e4e8ef7 100644
--- a/lib/asciidoctor/pdf/formatted_text/transform.rb
+++ b/lib/asciidoctor/pdf/formatted_text/transform.rb
@@ -376,7 +376,7 @@ module Asciidoctor
 
         def clone_fragment fragment, append = nil
           if fragment
-            fragment = fragment.dup
+            fragment = fragment.merge
             fragment[:styles] = fragment[:styles].dup if fragment.key? :styles
             fragment[:callback] = fragment[:callback].dup if fragment.key? :callback
             append ? (fragment.update append) : fragment