add tag v2_2_9

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/tags/v2_2_9@61257 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 141 insertions, 0 deletions

diff --git a/ruby_2_2/lib/rexml/formatters/pretty.rb b/ruby_2_2/lib/rexml/formatters/pretty.rb
new file mode 100644
index 0000000000..e5ba561a58
--- /dev/null
+++ b/ruby_2_2/lib/rexml/formatters/pretty.rb
@@ -0,0 +1,141 @@
+require 'rexml/formatters/default'
+
+module REXML
+  module Formatters
+    # Pretty-prints an XML document.  This destroys whitespace in text nodes
+    # and will insert carriage returns and indentations.
+    #
+    # TODO: Add an option to print attributes on new lines
+    class Pretty < Default
+
+      # If compact is set to true, then the formatter will attempt to use as
+      # little space as possible
+      attr_accessor :compact
+      # The width of a page.  Used for formatting text
+      attr_accessor :width
+
+      # Create a new pretty printer.
+      #
+      # output::
+      #   An object implementing '<<(String)', to which the output will be written.
+      # indentation::
+      #   An integer greater than 0.  The indentation of each level will be
+      #   this number of spaces.  If this is < 1, the behavior of this object
+      #   is undefined.  Defaults to 2.
+      # ie_hack::
+      #   If true, the printer will insert whitespace before closing empty
+      #   tags, thereby allowing Internet Explorer's XML parser to
+      #   function. Defaults to false.
+      def initialize( indentation=2, ie_hack=false )
+        @indentation = indentation
+        @level = 0
+        @ie_hack = ie_hack
+        @width = 80
+        @compact = false
+      end
+
+      protected
+      def write_element(node, output)
+        output << ' '*@level
+        output << "<#{node.expanded_name}"
+
+        node.attributes.each_attribute do |attr|
+          output << " "
+          attr.write( output )
+        end unless node.attributes.empty?
+
+        if node.children.empty?
+          if @ie_hack
+            output << " "
+          end
+          output << "/"
+        else
+          output << ">"
+          # If compact and all children are text, and if the formatted output
+          # is less than the specified width, then try to print everything on
+          # one line
+          skip = false
+          if compact
+            if node.children.inject(true) {|s,c| s & c.kind_of?(Text)}
+              string = ""
+              old_level = @level
+              @level = 0
+              node.children.each { |child| write( child, string ) }
+              @level = old_level
+              if string.length < @width
+                output << string
+                skip = true
+              end
+            end
+          end
+          unless skip
+            output << "\n"
+            @level += @indentation
+            node.children.each { |child|
+              next if child.kind_of?(Text) and child.to_s.strip.length == 0
+              write( child, output )
+              output << "\n"
+            }
+            @level -= @indentation
+            output << ' '*@level
+          end
+          output << "</#{node.expanded_name}"
+        end
+        output << ">"
+      end
+
+      def write_text( node, output )
+        s = node.to_s()
+        s.gsub!(/\s/,' ')
+        s.squeeze!(" ")
+        s = wrap(s, @width - @level)
+        s = indent_text(s, @level, " ", true)
+        output << (' '*@level + s)
+      end
+
+      def write_comment( node, output)
+        output << ' ' * @level
+        super
+      end
+
+      def write_cdata( node, output)
+        output << ' ' * @level
+        super
+      end
+
+      def write_document( node, output )
+        # Ok, this is a bit odd.  All XML documents have an XML declaration,
+        # but it may not write itself if the user didn't specifically add it,
+        # either through the API or in the input document.  If it doesn't write
+        # itself, then we don't need a carriage return... which makes this
+        # logic more complex.
+        node.children.each { |child|
+          next if child == node.children[-1] and child.instance_of?(Text)
+          unless child == node.children[0] or child.instance_of?(Text) or
+            (child == node.children[1] and !node.children[0].writethis)
+            output << "\n"
+          end
+          write( child, output )
+        }
+      end
+
+      private
+      def indent_text(string, level=1, style="\t", indentfirstline=true)
+        return string if level < 0
+        string.gsub(/\n/, "\n#{style*level}")
+      end
+
+      def wrap(string, width)
+        parts = []
+        while string.length > width and place = string.rindex(' ', width)
+          parts << string[0...place]
+          string = string[place+1..-1]
+        end
+        parts << string
+        parts.join("\n")
+      end
+
+    end
+  end
+end
+