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Ruby On Rails in UA/Code Review, теоретические вопросы/Сборник рецептов для String/Замена переменных в строках ERB

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2008-06-10 12:59:30	Ответить
Ruslan Voloshin Адрес: odessa Сообщений: 1293 Регистр: 2007-03-13 его блог 40 сообщ.	Замена переменных в строках ERB
	template = 'Oceania has always been at war with %s.' template % 'Eurasia' # => "Oceania has always been at war with Eurasia." template % 'Eastasia' # => "Oceania has always been at war with Eastasia." 'To 2 decimal places: %.2f' % Math::PI # => "To 2 decimal places: 3.14" 'Zero-padded: %.5d' % Math::PI # => "Zero-padded: 00003" #--- require 'erb' template = ERB.new %q{Chunky <%= food %>!} food = "bacon" template.result(binding) # => "Chunky bacon!" food = "peanut butter" template.result(binding) # => "Chunky peanut butter!" #--- puts template.result # Chunky peanut butter! #--- template = %q{ <% if problems.empty? %> Looks like your code is clean! <% else %> I found the following possible problems with your code: <% problems.each do \|problem, line\| %> * <%= problem %> on line <%= line %> <% end %> <% end %>}.gsub(/^\s+/, '') template = ERB.new(template, nil, '<>') problems = [["Use of is_a? instead of duck typing", 23], ["eval() is usually dangerous", 44]] template.run(binding) # I found the following possible problems with your code: # * Use of is_a? instead of duck typing on line 23 # * eval() is usually dangerous on line 44 problems = [] template.run(binding) # Looks like your code is clean! #--- class String def substitute(binding=TOPLEVEL_BINDING) eval(%{"#{self}"}, binding) end end template = %q{Chunky #{food}!} # => "Chunky \#{food}!" food = 'bacon' template.substitute(binding) # => "Chunky bacon!" food = 'peanut butter' template.substitute(binding) # => "Chunky peanut butter!" #--- food = '#{system("dir")}' puts template.substitute(binding) # Chunky #{system("dir")}! #--- ------------ Занимаюсь вебом и продвижением сайтов.
	ERB, erb.result, substitute

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