70 lines
2.6 KiB
Ruby
70 lines
2.6 KiB
Ruby
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module ActionView
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# CompiledTemplates modules hold methods that have been compiled.
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# Templates are compiled into these methods so that they do not need to be
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# re-read and re-parsed each request.
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#
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# Each template may be compiled into one or more methods. Each method accepts a given
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# set of parameters which is used to implement local assigns passing.
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#
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# To use a compiled template module, create a new instance and include it into the class
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# in which you want the template to be rendered.
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class CompiledTemplates < Module #:nodoc:
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attr_reader :method_names
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def initialize
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@method_names = Hash.new do |hash, key|
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hash[key] = "__compiled_method_#{(hash.length + 1)}"
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end
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@mtimes = {}
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end
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# Return the full key for the given identifier and argument names
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def full_key(identifier, arg_names)
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[identifier, arg_names]
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end
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# Return the selector for this method or nil if it has not been compiled
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def selector(identifier, arg_names)
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key = full_key(identifier, arg_names)
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method_names.key?(key) ? method_names[key] : nil
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end
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alias :compiled? :selector
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# Return the time at which the method for the given identifier and argument names was compiled.
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def mtime(identifier, arg_names)
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@mtimes[full_key(identifier, arg_names)]
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end
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# Compile the provided source code for the given argument names and with the given initial line number.
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# The identifier should be unique to this source.
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#
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# The file_name, if provided will appear in backtraces. If not provded, the file_name defaults
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# to the identifier.
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#
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# This method will return the selector for the compiled version of this method.
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def compile_source(identifier, arg_names, source, initial_line_number = 0, file_name = nil)
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file_name ||= identifier
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name = method_names[full_key(identifier, arg_names)]
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arg_desc = arg_names.empty? ? '' : "(#{arg_names * ', '})"
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fake_file_name = "#{file_name}#{arg_desc}" # Include the arguments for this version (for now)
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method_def = wrap_source(name, arg_names, source)
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begin
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module_eval(method_def, fake_file_name, initial_line_number)
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@mtimes[full_key(identifier, arg_names)] = Time.now
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rescue Exception => e # errors from compiled source
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e.blame_file! identifier
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raise
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end
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name
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end
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# Wrap the provided source in a def ... end block.
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def wrap_source(name, arg_names, source)
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"def #{name}(#{arg_names * ', '})\n#{source}\nend"
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end
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end
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end
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