Module: Origen::Generator::Renderer

Included in:
Compiler
Defined in:
lib/origen/generator/renderer.rb

Overview

Handles the recursive rendering and importing of sub templates and source files

Instance Method Summary collapse

Instance Method Details

#current_pipelineObject


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# File 'lib/origen/generator/renderer.rb', line 36

def current_pipeline
  pipeline.last
end

#insert(content) ⇒ Object

Insert rendered content into any placeholders


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# File 'lib/origen/generator/renderer.rb', line 41

def insert(content)
  while current_pipeline.size > 0
    current = current_pipeline.pop
    pipeline << []
    @current_options = current[:options]
    self.current_buffer = ''
    output = compile(current[:file],
                     sub_template: true,
                     block:        current[:block],
                     scope:        @scope
                    )
    if current[:indent] && current[:indent] > 0
      indent = ' ' * current[:indent]
      output = output.split("\n").map { |l| indent + l }.join("\n")
    end
    @current_options = nil
    content = insert_content(content, current[:placeholder], output)
  end
  pipeline.pop
  # Always give back a string, this is what existing callers expect
  #
  # Possible this could in future run into problems if the whole file cannot be read
  # into memory, but we can cross that path when we come to it
  if content.is_a?(Pathname)
    c = content.read
    content.delete
    c
  else
    content
  end
end

#insert_content(current, placeholder, content) ⇒ Object


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# File 'lib/origen/generator/renderer.rb', line 73

def insert_content(current, placeholder, content)
  # Start using the disk for storing the output rather than memory
  # once it starts to exceed this length
  max_length = 1_000_000
  if current.is_a?(Pathname) || content.is_a?(Pathname) ||
     ((current.length + content.length) > max_length)
    unless current.is_a?(Pathname)
      t = temporary_file
      t.open('w') { |f| f.puts current }
      current = t
    end
    new = temporary_file
    new.open('w') do |new_f|
      current.each_line do |line|
        if line.strip == placeholder
          if content.is_a?(Pathname)
            content.each_line do |line|
              new_f.puts line
            end
            content.delete
          else
            new_f.puts content.chomp
          end
        else
          new_f.puts line
        end
      end
    end
    current.delete
    new
  else
    current.sub(/ *#{placeholder}/, content)
  end
end

#optionsObject


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# File 'lib/origen/generator/renderer.rb', line 26

def options
  @current_options ||= {}
end

#pipelineObject


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# File 'lib/origen/generator/renderer.rb', line 30

def pipeline
  @pipeline ||= []
  @pipeline << [] if @pipeline.empty?
  @pipeline
end

#placeholderObject


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# File 'lib/origen/generator/renderer.rb', line 20

def placeholder
  @ix ||= 0
  @ix += 1
  "_origen_render_placeholder_#{@ix}"
end

#render(file, options = {}, &block) ⇒ Object Also known as: import


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# File 'lib/origen/generator/renderer.rb', line 6

def render(file, options = {}, &block)
  fail 'File argument is nil' unless file
  file = Origen.file_handler.clean_path_to_sub_template(file)
  current_pipeline << { file: file, options: options,
                        placeholder: placeholder, block: block,
                        indent: options[:indent] || 0
                      }
  if block_given?
    self.current_buffer += current_pipeline.last[:placeholder] + "\n"
  end
  current_pipeline.last[:placeholder]
end

#temporary_fileObject

Returns a Pathname to a uniquely named temporary file


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# File 'lib/origen/generator/renderer.rb', line 109

def temporary_file
  # Ensure this is unique so that is doesn't clash with parallel compile processes
  Pathname.new "#{Origen.root}/tmp/compiler_#{Process.pid}_#{Time.now.to_f}"
end