Class: SyntaxTree::Haml::MutationVisitor

Inherits:

Object

• Object
• SyntaxTree::Haml::MutationVisitor

Defined in:

lib/syntax_tree/haml/mutation_visitor.rb

Direct Known Subclasses

Tailwindcss::HamlMutationVisitor

Instance Method Summary

• #copy_and_visit_children(node) ⇒ Object (also: #visit_comment, #visit_doctype, #visit_filter, #visit_haml_comment, #visit_plain, #visit_root, #visit_script, #visit_silent_script, #visit_tag)
• #visit(node) ⇒ Object

  A base Haml Visitor class that returns a deep copy of the AST.

Instance Method Details

#copy_and_visit_children(node) ⇒ Object Also known as: visit_comment, visit_doctype, visit_filter, visit_haml_comment, visit_plain, visit_root, visit_script, visit_silent_script, visit_tag

# File 'lib/syntax_tree/haml/mutation_visitor.rb', line 15

def copy_and_visit_children(node)
  # Haml::Parser::ParseNode has these main attributes
  # - value: nil | Hash
  # - children: [ParseNode]
  # - parent: ParseNode
  node.dup.tap do |clone|
    clone.value = node.value.dup unless node.value.nil?
    clone.children =
      node.children.map do |child|
        visit(child).tap { |child_copy| child_copy.parent = clone }
      end
  end
end

#visit(node) ⇒ Object

A base Haml Visitor class that returns a deep copy of the AST. It can be subclassed to mutate some parts of the AST and keep everything else as it was.

Ideally this class (or equivalent) would existing within SyntaxTree::Haml gem.

# File 'lib/syntax_tree/haml/mutation_visitor.rb', line 11

def visit(node)
  node&.accept(self)
end