Class: Liquid::BlockBody

Inherits:
Object
  • Object
show all
Defined in:
lib/liquid/block_body.rb,
lib/liquid/profiler/hooks.rb

Direct Known Subclasses

Document

Constant Summary collapse

FullToken = 
/\A#{TagStart}#{WhitespaceControl}?\s*(\w+)\s*(.*?)#{WhitespaceControl}?#{TagEnd}\z/om
ContentOfVariable = 
/\A#{VariableStart}#{WhitespaceControl}?(.*?)#{WhitespaceControl}?#{VariableEnd}\z/om
TAGSTART = 
"{%".freeze
VARSTART = 
"{{".freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ BlockBody

Returns a new instance of BlockBody.



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# File 'lib/liquid/block_body.rb', line 10

def initialize
  @nodelist = []
  @blank = true
end

Instance Attribute Details

#nodelist ⇒ Object (readonly)

Returns the value of attribute nodelist.



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# File 'lib/liquid/block_body.rb', line 8

def nodelist
  @nodelist
end

Instance Method Details

#blank? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/liquid/block_body.rb', line 67

def blank?
  @blank
end

#parse(tokenizer, parse_context) {|nil, nil| ... } ⇒ Object

Yields:

  • (nil, nil) 


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# File 'lib/liquid/block_body.rb', line 15

def parse(tokenizer, parse_context)
  parse_context.line_number = tokenizer.line_number
  while token = tokenizer.shift
    unless token.empty?
      case
      when token.start_with?(TAGSTART)
        whitespace_handler(token, parse_context)
        if token =~ FullToken
          tag_name = $1
          markup = $2
          # fetch the tag from registered blocks
          if tag = registered_tags[tag_name]
            new_tag = tag.parse(tag_name, markup, tokenizer, parse_context)
            @blank &&= new_tag.blank?
            @nodelist << new_tag
          else
            # end parsing if we reach an unknown tag and let the caller decide
            # determine how to proceed
            return yield tag_name, markup
          end
        else
          raise_missing_tag_terminator(token, parse_context)
        end
      when token.start_with?(VARSTART)
        whitespace_handler(token, parse_context)
        @nodelist << create_variable(token, parse_context)
        @blank = false
      else
        if parse_context.trim_whitespace
          token.lstrip!
        end
        parse_context.trim_whitespace = false
        @nodelist << token
        @blank &&= !!(token =~ /\A\s*\z/)
      end
    end
    parse_context.line_number = tokenizer.line_number
  end

  yield nil, nil
end

#render(context) ⇒ Object 



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# File 'lib/liquid/block_body.rb', line 71

def render(context)
  output = []
  context.resource_limits.render_score += @nodelist.length

  @nodelist.each do |token|
    # Break out if we have any unhanded interrupts.
    break if context.interrupt?

    begin
      # If we get an Interrupt that means the block must stop processing. An
      # Interrupt is any command that stops block execution such as {% break %}
      # or {% continue %}
      if token.is_a?(Continue) || token.is_a?(Break)
        context.push_interrupt(token.interrupt)
        break
      end

      node_output = render_node(token, context)

      unless token.is_a?(Block) && token.blank?
        output << node_output
      end
    rescue MemoryError => e
      raise e
    rescue UndefinedVariable, UndefinedDropMethod, UndefinedFilter => e
      context.handle_error(e, token.line_number, token.raw)
      output << nil
    rescue ::StandardError => e
      output << context.handle_error(e, token.line_number, token.raw)
    end
  end

  output.join
end

#render_node_with_profiling(node, context) ⇒ Object Also known as: render_node 



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# File 'lib/liquid/profiler/hooks.rb', line 3

def render_node_with_profiling(node, context)
  Profiler.profile_node_render(node) do
    render_node_without_profiling(node, context)
  end
end

#whitespace_handler(token, parse_context) ⇒ Object 



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# File 'lib/liquid/block_body.rb', line 57

def whitespace_handler(token, parse_context)
  if token[2] == WhitespaceControl
    previous_token = @nodelist.last
    if previous_token.is_a? String
      previous_token.rstrip!
    end
  end
  parse_context.trim_whitespace = (token[-3] == WhitespaceControl)
end