Class: ActionView::CompiledTemplates

Inherits:
Module
  • Object
show all
Defined in:
lib/action_view/compiled_templates.rb

Overview

CompiledTemplates modules hold methods that have been compiled. Templates are compiled into these methods so that they do not need to be re-read and re-parsed each request.

Each template may be compiled into one or more methods. Each method accepts a given set of parameters which is used to implement local assigns passing.

To use a compiled template module, create a new instance and include it into the class in which you want the template to be rendered.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ CompiledTemplates

Returns a new instance of CompiledTemplates.



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# File 'lib/action_view/compiled_templates.rb', line 16

def initialize
  @method_names = Hash.new do |hash, key|
    hash[key] = "__compiled_method_#{(hash.length + 1)}"
  end
  @mtimes = {}
end

Instance Attribute Details

#method_names ⇒ Object (readonly)

:nodoc:



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# File 'lib/action_view/compiled_templates.rb', line 14

def method_names
  @method_names
end

Instance Method Details

#compile_source(identifier, arg_names, source, initial_line_number = 0, file_name = nil) ⇒ Object

Compile the provided source code for the given argument names and with the given initial line number. The identifier should be unique to this source.

The file_name, if provided will appear in backtraces. If not provded, the file_name defaults to the identifier.

This method will return the selector for the compiled version of this method.



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# File 'lib/action_view/compiled_templates.rb', line 47

def compile_source(identifier, arg_names, source, initial_line_number = 0, file_name = nil)
  file_name ||= identifier
  name = method_names[full_key(identifier, arg_names)]
  arg_desc = arg_names.empty? ? '' : "(#{arg_names * ', '})"
  fake_file_name = "#{file_name}#{arg_desc}" # Include the arguments for this version (for now)
  
  method_def = wrap_source(name, arg_names, source)
  
  begin
    module_eval(method_def, fake_file_name, initial_line_number)
    @mtimes[full_key(identifier, arg_names)] = Time.now
  rescue Exception => e  # errors from compiled source
    e.blame_file! identifier
    raise
  end
  name
end

#full_key(identifier, arg_names) ⇒ Object

Return the full key for the given identifier and argument names



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# File 'lib/action_view/compiled_templates.rb', line 24

def full_key(identifier, arg_names)
  [identifier, arg_names]
end

#mtime(identifier, arg_names) ⇒ Object

Return the time at which the method for the given identifier and argument names was compiled.



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# File 'lib/action_view/compiled_templates.rb', line 36

def mtime(identifier, arg_names)
  @mtimes[full_key(identifier, arg_names)]
end

#selector(identifier, arg_names) ⇒ Object Also known as: compiled?

Return the selector for this method or nil if it has not been compiled



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# File 'lib/action_view/compiled_templates.rb', line 29

def selector(identifier, arg_names)
  key = full_key(identifier, arg_names)
  method_names.key?(key) ? method_names[key] : nil
end

#wrap_source(name, arg_names, source) ⇒ Object

Wrap the provided source in a def … end block.



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# File 'lib/action_view/compiled_templates.rb', line 66

def wrap_source(name, arg_names, source)
  "def #{name}(#{arg_names * ', '})\n#{source}\nend"
end