class RuboCop::Cop::Style::SymbolArray

%i[foo bar baz]
# bad
[:foo, :bar, :baz]
# good
@example EnforcedStyle: brackets
%i(foo ( ))
# bad (contains () with spaces)
%i[foo [ ]]
# bad (contains [] with spaces)
%i[foo\ bar baz\ quux]
# bad (contains spaces)
[:foo, :bar, :baz]
# bad
%i[foo bar baz]
# good
@example EnforcedStyle: percent (default)
array of 2 or fewer elements.
cop. For example, a ‘MinSize` of `3` will not enforce a style on an
If set, arrays with fewer elements than this value will not trigger the
Configuration option: MinSize
support a version of Ruby lower than 2.0.
projects which do not want to use that syntax, perhaps because they
Alternatively, it checks for symbol arrays using the %i() syntax on
using the %i() syntax.
Checks for array literals made up of symbols that are not

def build_bracketed_array(node) 

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

def complex_content?(node) 

def complex_content?(node)
  node.children.any? do |sym|
    return false if DELIMITERS.include?(sym.source)
    content = *sym
    content = content.map { |c| c.is_a?(AST::Node) ? c.source : c }.join
    content_without_delimiter_pairs = content.gsub(/(\[[^\s\[\]]*\])|(\([^\s\(\)]*\))/, '')
    content.include?(' ') || DELIMITERS.any? do |delimiter|
      content_without_delimiter_pairs.include?(delimiter)
    end
  end
end

def invalid_percent_array_contents?(node) 

def invalid_percent_array_contents?(node)
  complex_content?(node)
end

def on_array(node) 

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

def symbol_without_quote?(string) 

def symbol_without_quote?(string)
  # 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 to_symbol_literal(string) 

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