80 lines
2.4 KiB
Ruby
80 lines
2.4 KiB
Ruby
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module ActionView
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# LookupContext is the object responsible to hold all information required to lookup
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# templates, i.e. view paths and details. The LookupContext is also responsible to
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# generate a key, given to view paths, used in the resolver cache lookup. Since
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# this key is generated just once during the request, it speeds up all cache accesses.
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class LookupContext #:nodoc:
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attr_reader :details, :view_paths
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class DetailsKey #:nodoc:
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attr_reader :details
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alias :eql? :equal?
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@details_keys = Hash.new
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def self.get(details)
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@details_keys[details] ||= new(details)
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end
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def initialize(details)
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@details, @hash = details, details.hash
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end
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end
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def initialize(view_paths, details = {})
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@details, @details_key = details, nil
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self.view_paths = view_paths
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end
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# Shortcut to read formats from details.
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def formats
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@details[:formats]
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end
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# Shortcut to set formats in details.
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def formats=(value)
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self.details = @details.merge(:formats => Array(value))
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end
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# Whenever setting view paths, makes a copy so we can manipulate then in
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# instance objects as we wish.
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def view_paths=(paths)
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@view_paths = ActionView::Base.process_view_paths(paths)
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end
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# Setter for details. Everything this method is invoked, we need to nullify
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# the details key if it changed.
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def details=(details)
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@details = details
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@details_key = nil if @details_key && @details_key.details != details
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end
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def details_key
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@details_key ||= DetailsKey.get(details) unless details.empty?
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end
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# Update the details keys by merging the given hash into the current
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# details hash. If a block is given, the details are modified just during
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# the execution of the block and reverted to the previous value after.
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def update_details(new_details)
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old_details = self.details
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self.details = old_details.merge(new_details)
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if block_given?
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begin
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yield
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ensure
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self.details = old_details
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end
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end
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end
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def find_template(name, prefix = nil, partial = false)
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@view_paths.find(name, details, prefix, partial || false, details_key)
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end
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def template_exists?(name, prefix = nil, partial = false)
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@view_paths.exists?(name, details, prefix, partial || false, details_key)
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end
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end
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end
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