Class: Liquid::BlockBody

Inherits:
Object
  • Object
show all
Includes:
BlockBodyProfilingHook
Defined in:
lib/liquid/block_body.rb

Constant Summary collapse

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

Instance Attribute Summary collapse

Class Method 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 16

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 14

def nodelist
  @nodelist
end

Class Method Details

.raise_missing_tag_terminator(token, parse_context) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Raises:



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# File 'lib/liquid/block_body.rb', line 69

def self.raise_missing_tag_terminator(token, parse_context)
  raise SyntaxError, parse_context.locale.t("errors.syntax.tag_termination", token: token, tag_end: TagEnd.inspect)
end

.raise_missing_variable_terminator(token, parse_context) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Raises:



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# File 'lib/liquid/block_body.rb', line 74

def self.raise_missing_variable_terminator(token, parse_context)
  raise SyntaxError, parse_context.locale.t("errors.syntax.variable_termination", token: token, tag_end: VariableEnd.inspect)
end

.render_node(context, output, node) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/liquid/block_body.rb', line 79

def self.render_node(context, output, node)
  node.render_to_output_buffer(context, output)
rescue => exc
  blank_tag = !node.instance_of?(Variable) && node.blank?
  rescue_render_node(context, output, node.line_number, exc, blank_tag)
end

.rescue_render_node(context, output, line_number, exc, blank_tag) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/liquid/block_body.rb', line 87

def self.rescue_render_node(context, output, line_number, exc, blank_tag)
  case exc
  when MemoryError
    raise
  when UndefinedVariable, UndefinedDropMethod, UndefinedFilter
    context.handle_error(exc, line_number)
  else
    error_message = context.handle_error(exc, line_number)
    unless blank_tag # conditional for backwards compatibility
      output << error_message
    end
  end
end

.unknown_tag_in_liquid_tag(tag, parse_context) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/liquid/block_body.rb', line 64

def self.unknown_tag_in_liquid_tag(tag, parse_context)
  Block.raise_unknown_tag(tag, 'liquid', '%}', parse_context)
end

Instance Method Details

#blank? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/liquid/block_body.rb', line 175

def blank?
  @blank
end

#freeze ⇒ Object 



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# File 'lib/liquid/block_body.rb', line 33

def freeze
  @nodelist.freeze
  super
end

#parse(tokenizer, parse_context, &block) ⇒ Object

Raises:

  • (FrozenError) 


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# File 'lib/liquid/block_body.rb', line 21

def parse(tokenizer, parse_context, &block)
  raise FrozenError, "can't modify frozen Liquid::BlockBody" if frozen?

  parse_context.line_number = tokenizer.line_number

  if tokenizer.for_liquid_tag
    parse_for_liquid_tag(tokenizer, parse_context, &block)
  else
    parse_for_document(tokenizer, parse_context, &block)
  end
end

#remove_blank_strings ⇒ Object

Remove blank strings in the block body for a control flow tag (e.g. ‘if`, `for`, `case`, `unless`) with a blank body.

For example, in a conditional assignment like the following

“‘ if size > max_size %

{% assign size = max_size %}

endif % “‘

we assume the intention wasn’t to output the blank spaces in the ‘if` tag’s block body, so this method will remove them to reduce the render output size.

Note that it is now preferred to use the ‘liquid` tag for this use case.



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# File 'lib/liquid/block_body.rb', line 194

def remove_blank_strings
  raise "remove_blank_strings only support being called on a blank block body" unless @blank
  @nodelist.reject! { |node| node.instance_of?(String) }
end

#render(context) ⇒ Object 



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# File 'lib/liquid/block_body.rb', line 199

def render(context)
  render_to_output_buffer(context, +'')
end

#render_to_output_buffer(context, output) ⇒ Object 



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# File 'lib/liquid/block_body.rb', line 203

def render_to_output_buffer(context, output)
  freeze unless frozen?

  context.resource_limits.increment_render_score(@nodelist.length)

  idx = 0
  while (node = @nodelist[idx])
    if node.instance_of?(String)
      output << node
    else
      render_node(context, output, node)
      # 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 %}. These tags may also occur through Block or Include tags.
      break if context.interrupt? # might have happened in a for-block
    end
    idx += 1

    context.resource_limits.increment_write_score(output)
  end

  output
end

#whitespace_handler(token, parse_context) ⇒ Object 



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# File 'lib/liquid/block_body.rb', line 161

def whitespace_handler(token, parse_context)
  if token[2] == WhitespaceControl
    previous_token = @nodelist.last
    if previous_token.is_a?(String)
      first_byte = previous_token.getbyte(0)
      previous_token.rstrip!
      if previous_token.empty? && parse_context[:bug_compatible_whitespace_trimming] && first_byte
        previous_token << first_byte
      end
    end
  end
  parse_context.trim_whitespace = (token[-3] == WhitespaceControl)
end