@title = "Example title"
v = View.new("./view.erb", layout: "./layout.erb")
puts v.render(binding)Question asked here: http://stackoverflow.com/questions/39059616/ruby-erb-create-a-content-for-method.
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Ruby ERB - Create a content_for method — http://stackoverflow.com/questions/39059616/ruby-erb-create-a-content-for-method
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title> | |
| <%= yield_content :title, "Default" %> | |
| </title> | |
| </head> | |
| <body> | |
| <h1> | |
| <% if content_for? :title %> | |
| <%= yield_content :title %> | |
| <% end %> | |
| </h1> | |
| <%= yield %> | |
| </body> | |
| </html> |
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| <% content_for :title do %> | |
| <%= @title %> | |
| <% end %> | |
| <p>Page Example</p> |
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| require "erb" | |
| class View | |
| def initialize(template, layout: nil) | |
| @template = template | |
| @layout = layout | |
| end | |
| def render(variables = {}) | |
| unless @template.nil? | |
| templates = [read_template(@template)] | |
| templates << read_template(@layout) unless @layout.nil? | |
| content = templates.inject(nil) do |prev, temp| | |
| _render(temp, variables) { prev } | |
| end | |
| end | |
| end | |
| def context | |
| @context ||= Context.new | |
| end | |
| def format_variables(v) | |
| case v | |
| when Binding | |
| h = {} | |
| v.eval("instance_variables").each do |k| | |
| h[k.to_s.sub(/^@/, '')] = v.eval("instance_variable_get(:#{k})") | |
| end | |
| h | |
| when Hash | |
| v | |
| else | |
| {} | |
| end | |
| end | |
| private | |
| def read_template(template) | |
| unless template.empty? | |
| path = ::File.expand_path("../#{template}", __FILE__) | |
| return ::File.read(path) if ::File.exist?(path) | |
| end | |
| template | |
| end | |
| def options | |
| @options ||= { | |
| :safe_level => nil, | |
| :trim_mode => '<>-', | |
| :eoutvar => '@_erbout', | |
| } | |
| end | |
| def _render(str, variables = {}) | |
| opts = options | |
| format_variables(variables).each do |name, value| | |
| context.instance_variable_set("@#{name}", value) | |
| end | |
| context.instance_eval do | |
| # str = "<% @#{opts[:eoutvar]} = #{opts[:eoutvar]} %>\n" + str | |
| erb = ::ERB.new(str, *opts.values_at(:safe_level, :trim_mode, :eoutvar)) | |
| erb.result(binding).sub(/\A\n/, '') | |
| end | |
| end | |
| protected | |
| # CommonHelpers. | |
| module CommonHelpers | |
| def content_for(key, content = nil, &block) | |
| block ||= proc { |*| content } | |
| content_blocks[key.to_sym] << capture_later(&block) | |
| end | |
| def content_for?(key) | |
| content_blocks[key.to_sym].any? | |
| end | |
| def yield_content(key, default = nil) | |
| return default if content_blocks[key.to_sym].empty? | |
| content_blocks[key.to_sym].map { |b| capture(&b) }.join | |
| end | |
| # | |
| def partial(path, variables: nil) | |
| return "" if path.nil? | |
| variables ||= binding if variables.nil? | |
| View.new(path).render(variables) | |
| end | |
| # | |
| def h(obj) | |
| case obj | |
| when String | |
| ::ERB::Util.html_escape(obj) | |
| else | |
| ::ERB::Util.html_escape(obj.inspect) | |
| end | |
| end | |
| private | |
| def capture(&block) | |
| @capture = nil | |
| @_erbout, _buf_was = '', @_erbout | |
| result = yield | |
| @_erbout = _buf_was | |
| result.strip.empty? && @capture ? @capture : result | |
| end | |
| private | |
| def capture_later(&block) | |
| proc { |*| @capture = capture(&block) } | |
| end | |
| def content_blocks | |
| @content_blocks ||= Hash.new {|h,k| h[k] = [] } | |
| end | |
| end | |
| class Context | |
| include CommonHelpers | |
| end | |
| end |
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