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First pass at a more Ruby-like Report class from the example in Design Patterns in Ruby, Chapter 3 [for hashrocket bookclub]
class Report
attr_accessor :preamble, :before, :after, :prologue
def initialize
@subject = 'Monthly Report'
@content = ['Things are going', 'Really, really good!']
end
def generate
[:preamble,:head,:body,:prologue].map do |meth|
send(meth)
end.compact.join("\n")
end
def head
"#{@subject}:"
end
def body
[before, @content.map{ |line| output(line) }, after].join("\n")
end
def output(line)
line
end
end
class HTMLReport < Report
def preamble
'<html>'
end
def head
"<head><title>#{@subject}</title></head>"
end
def before
'<body>'
end
def output(line)
"<p>#{line}</p>"
end
def after
'</body>'
end
def prologue
'</html>'
end
end
if __FILE__ == $0
require 'rubygems'
require 'spec'
Report.new.generate.should == "Monthly Report:\n\n" \
"Things are going\n" \
"Really, really good!\n"
HTMLReport.new.generate.should == "<html>\n" \
"<head><title>Monthly Report</title></head>\n" \
"<body>\n" \
"<p>Things are going</p>\n" \
"<p>Really, really good!</p>\n" \
"</body>\n" \
"</html>" \
end
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