Class: SyntaxTree::LoopFormatter

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

Overview

Formats an Until or While node.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(keyword, node) ⇒ LoopFormatter

Returns a new instance of LoopFormatter.



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# File 'lib/syntax_tree/node.rb', line 11218

def initialize(keyword, node)
  @keyword = keyword
  @node = node
end

Instance Attribute Details

#keyword ⇒ Object (readonly)

String

the name of the keyword used for this loop



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# File 'lib/syntax_tree/node.rb', line 11213

def keyword
  @keyword
end

#node ⇒ Object (readonly)

Until | While

the node that is being formatted



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# File 'lib/syntax_tree/node.rb', line 11216

def node
  @node
end

Instance Method Details

#format(q) ⇒ Object 



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# File 'lib/syntax_tree/node.rb', line 11223

def format(q)
  # If we're in the modifier form and we're modifying a `begin`, then this
  # is a special case where we need to explicitly use the modifier form
  # because otherwise the semantic meaning changes. This looks like:
  #
  #     begin
  #       foo
  #     end while bar
  #
  # Also, if the statement of the modifier includes an assignment, then we
  # can't know for certain that it won't impact the predicate, so we need to
  # force it to stay as it is. This looks like:
  #
  #     foo = bar while foo
  #
  if node.modifier? && (statement = node.statements.body.first) &&
       (statement.is_a?(Begin) || ContainsAssignment.call(statement))
    q.format(statement)
    q.text(" #{keyword} ")
    q.format(node.predicate)
  elsif node.statements.empty?
    q.group do
      q.text("#{keyword} ")
      q.nest(keyword.length + 1) { q.format(node.predicate) }
      q.breakable_force
      q.text("end")
    end
  elsif ContainsAssignment.call(node.predicate)
    format_break(q)
    q.break_parent
  else
    q.group do
      q
        .if_break { format_break(q) }
        .if_flat do
          Parentheses.flat(q) do
            q.format(node.statements)
            q.text(" #{keyword} ")
            q.format(node.predicate)
          end
        end
    end
  end
end