Contents

#--
# Copyright 2006 Suraj N. Kurapati
# See the file named LICENSE for details.

require 'erb'

# Returns an array containing the current ERB buffer and the content
# that the given block will append to the buffer when it is invoked.
#
# == Example
# Suppose your ERB template invoked a method with some arguments
# and some content in a block.  You can pass the block to this
# method to obtain the content contained within the block.
#
## template = ERB.new <<-EOS
## <% wrap_xml "message" do %>
##   i love ruby!
## <% end %>
## EOS
#
# In this case, the ERB template invokes the _wrap_xml_
# method to wrap some content within a pair of XML tags.
#
## def wrap_xml tag, &block
##   buffer, content = ERB.buffer_and_content(&block)
##   buffer << "<#{tag}>#{content}</#{tag}>"
## end
#
# When we evaluate the template:
## puts template.result(binding)
#
# we see the following output:
## <message>
##   i love ruby!
## </message>
#
def ERB.buffer_and_content
  raise ArgumentError unless block_given?

  # buffer + content
  buffer = yield
  a = buffer.length

  # buffer + content + content
  yield
  b = buffer.length

  # buffer + content
  content = buffer.slice! a..b

  # buffer
  buffer.slice! -content.length..-1

  [buffer, content]
end

Version data entries

5 entries across 5 versions & 1 rubygems

Version	Path
ruby-vpi-17.0.0	doc/lib/erb_content.rb
ruby-vpi-18.0.0	doc/lib/erb_content.rb
ruby-vpi-19.0.0	doc/lib/erb_content.rb
ruby-vpi-18.0.2	doc/lib/erb_content.rb
ruby-vpi-18.0.1	doc/lib/erb_content.rb