class RuboCop::Cop::Style::SymbolArray

def build_bracketed_array(node)
  syms = node.children.map do |c|
    if c.dsym_type?
      string_literal = to_string_literal(c.source)
      ":#{trim_string_interporation_escape_character(string_literal)}"
    else
      to_symbol_literal(c.value.to_s)
    end
  end
  "[#{syms.join(', ')}]"
end

def on_array(node)
  if bracketed_array_of?(:sym, node)
    return if symbols_contain_spaces?(node)
    check_bracketed_array(node, 'i')
  elsif node.percent_literal?(:symbol)
    check_percent_array(node)
  end
end

def symbol_without_quote?(string)
  special_gvars = %w[
    $! $" $$ $& $' $* $+ $, $/ $; $: $. $< $= $> $? $@ $\\ $_ $` $~ $0
    $-0 $-F $-I $-K $-W $-a $-d $-i $-l $-p $-v $-w
  ]
  redefinable_operators = %w(
    | ^ & <=> == === =~ > >= < <= << >>
    + - * / % ** ~ +@ -@ [] []= ` ! != !~
  )
  # method name
  /\A[a-zA-Z_]\w*[!?]?\z/.match?(string) ||
    # instance / class variable
    /\A@@?[a-zA-Z_]\w*\z/.match?(string) ||
    # global variable
    /\A\$[1-9]\d*\z/.match?(string) ||
    /\A\$[a-zA-Z_]\w*\z/.match?(string) ||
    special_gvars.include?(string) ||
    redefinable_operators.include?(string)
end

def symbols_contain_spaces?(node)
  node.children.any? do |sym|
    content, = *sym
    / /.match?(content)
  end
end

def to_symbol_literal(string)
  if symbol_without_quote?(string)
    ":#{string}"
  else
    ":#{to_string_literal(string)}"
  end
end