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Showing content from https://ruby-syntax-tree.github.io/syntax_tree/SyntaxTree/Formatter/../Statements.html below:

class SyntaxTree::Statements - RDoc Documentation

1. SyntaxTree::
2. Statements

Everything that has a block of code inside of it has a list of statements. Normally we would just track those as a node that has an array body, but we have some special handling in order to handle empty statement lists. They need to have the right location information, so all of the parent node of stmts nodes will report back down the location information. We then propagate that onto void_stmt nodes inside the stmts in order to make sure all comments get printed appropriately.

Array[ Node ]

the list of expressions contained within this node

def initialize(body:, location:)
  @body = body
  @location = location
  @comments = []
end

def ===(other)
  other.is_a?(Statements) && ArrayMatch.call(body, other.body)
end

def accept(visitor)
  visitor.visit_statements(self)
end

def bind(parser, start_char, start_column, end_char, end_column)
  @location =
    Location.new(
      start_line: location.start_line,
      start_char: start_char,
      start_column: start_column,
      end_line: location.end_line,
      end_char: end_char,
      end_column: end_column
    )

  if (void_stmt = body[0]).is_a?(VoidStmt)
    location = void_stmt.location
    location =
      Location.new(
        start_line: location.start_line,
        start_char: start_char,
        start_column: start_column,
        end_line: location.end_line,
        end_char: start_char,
        end_column: end_column
      )

    body[0] = VoidStmt.new(location: location)
  end

  attach_comments(parser, start_char, end_char)
end

def bind_end(end_char, end_column)
  @location =
    Location.new(
      start_line: location.start_line,
      start_char: location.start_char,
      start_column: location.start_column,
      end_line: location.end_line,
      end_char: end_char,
      end_column: end_column
    )
end

def copy(body: nil, location: nil)
  node =
    Statements.new(
      body: body || self.body,
      location: location || self.location
    )

  node.comments.concat(comments.map(&:copy))
  node
end

def deconstruct_keys(_keys)
  { body: body, location: location, comments: comments }
end

def empty?
  body.all? do |statement|
    statement.is_a?(VoidStmt) && statement.comments.empty?
  end
end

def format(q)
  line = nil

  
  
  
  
  if body.length == 2
    void_stmt, comment = body

    if void_stmt.is_a?(VoidStmt) && comment.is_a?(Comment)
      q.format(comment)
      q.break_parent
      return
    end
  end

  previous = nil
  body.each do |statement|
    next if statement.is_a?(VoidStmt)

    if line.nil?
      q.format(statement)
    elsif (statement.location.start_line - line) > 1
      q.breakable_force
      q.breakable_force
      q.format(statement)
    elsif (statement.is_a?(VCall) && statement.access_control?) ||
          (previous.is_a?(VCall) && previous.access_control?)
      q.breakable_force
      q.breakable_force
      q.format(statement)
    elsif statement.location.start_line != line
      q.breakable_force
      q.format(statement)
    elsif !q.parent.is_a?(StringEmbExpr)
      q.breakable_force
      q.format(statement)
    else
      q.text("; ")
      q.format(statement)
    end

    line = statement.location.end_line
    previous = statement
  end
end

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