Class: Haml::Parser::ParseNode

Inherits:
Object
  • Object
show all
Defined in:
lib/syntax_tree/haml.rb

Instance Method Summary collapse

Instance Method Details

#accept(visitor) ⇒ Object

Here we’re going to hook into the parse node and define a method that will accept a visitor in order to walk through the tree.



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# File 'lib/syntax_tree/haml.rb', line 60

def accept(visitor)
  case type
  when :comment
    visitor.visit_comment(self)
  when :doctype
    visitor.visit_doctype(self)
  when :filter
    visitor.visit_filter(self)
  when :haml_comment
    visitor.visit_haml_comment(self)
  when :plain
    visitor.visit_plain(self)
  when :root
    visitor.visit_root(self)
  when :script
    visitor.visit_script(self)
  when :silent_script
    visitor.visit_silent_script(self)
  when :tag
    visitor.visit_tag(self)
  else
    raise "Unknown node type: #{type}"
  end
end

#format(q) ⇒ Object

This is our entrypoint for the formatter. We effectively delegate this to accepting the Format visitor.



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# File 'lib/syntax_tree/haml.rb', line 87

def format(q)
  accept(SyntaxTree::Haml::Format.new(q))
end

#last_line ⇒ Object

When we’re formatting a list of children, we need to know the last line a node is on. This is because the next node in the list of children should be at most 1 blank line below the last line of the previous node. We cache this because at worst it requires walking the entire tree because filter nodes can take up multiple lines.



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# File 'lib/syntax_tree/haml.rb', line 96

def last_line
  @last_line ||=
    if children.any?
      children.last.last_line
    elsif type == :filter
      line + value[:text].rstrip.count("\n") + 1
    else
      line
    end
end

#pretty_print(q) ⇒ Object

This is our entrypoint for the pretty printer. We effectively delegate this to accepting the PrettyPrint visitor.



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# File 'lib/syntax_tree/haml.rb', line 109

def pretty_print(q)
  accept(SyntaxTree::Haml::PrettyPrint.new(q))
end