class RuboCop::Cop::Layout::SpaceInsideHashLiteralBraces

foo = { }
foo = { }
foo = { }
# good
foo = {}
# bad
# empty hash braces contain space.
# The ‘space` EnforcedStyleForEmptyBraces style enforces that
@example EnforcedStyleForEmptyBraces: space
bar = {}
foo = {}
# good
bar = { }
foo = { }
# bad
# empty hash braces do not contain spaces.
# The `no_space` EnforcedStyleForEmptyBraces style enforces that
@example EnforcedStyleForEmptyBraces: no_space (default)
foo = {{ a: 1 } => { b: { c: 2 }}}
h = { a: { b: 2 }}
# good
foo = { { a: 1 } => { b: { c: 2 } } }
h = { a: { b: 2 } }
# bad
# braces or right braces are collapsed together in nested hashes.
# hash braces, with the exception that successive left
# The `compact` style normally requires a space inside
@example EnforcedStyle: compact
h = {a: 1, b: 2}
# good
h = { a: 1, b: 2 }
# bad
# no surrounding space.
# The `no_space` style enforces that hash literals have
@example EnforcedStyle: no_space
h = { a: 1, b: 2 }
# good
h = {a: 1, b: 2}
# bad
# surrounding space.
# The `space` style enforces that hash literals have
@example EnforcedStyle: space (default)
surrounding space depending on configuration.
Checks that braces used for hash literals have or don’t have

def ambiguous_or_unexpected_style_detected(style, is_match)

def ambiguous_or_unexpected_style_detected(style, is_match)
  if is_match
    ambiguous_style_detected(style, :compact)
  else
    unexpected_style_detected(style)
  end
end

def autocorrect(range)

def autocorrect(range)
  lambda do |corrector|
    # It is possible that BracesAroundHashParameters will remove the
    # braces while this cop inserts spaces. This can lead to unwanted
    # changes to the inspected code. If we replace the brace with a
    # brace plus space (rather than just inserting a space), then any
    # removal of the same brace will give us a clobbering error. This
    # in turn will make RuboCop fall back on cop-by-cop
    # auto-correction. Problem solved.
    case range.source
    when /\s/ then corrector.remove(range)
    when '{' then corrector.replace(range, '{ ')
    else corrector.replace(range, ' }')
    end
  end
end

def check(token1, token2)

def check(token1, token2)
  # No offense if line break inside.
  return if token1.line < token2.line
  return if token2.comment? # Also indicates there's a line break.
  is_empty_braces = token1.left_brace? && token2.right_curly_brace?
  expect_space    = expect_space?(token1, token2)
  if offense?(token1, expect_space)
    incorrect_style_detected(token1, token2,
                             expect_space, is_empty_braces)
  else
    correct_style_detected
  end
end

def expect_space?(token1, token2)

def expect_space?(token1, token2)
  is_same_braces  = token1.type == token2.type
  is_empty_braces = token1.left_brace? && token2.right_curly_brace?
  if is_same_braces && style == :compact
    false
  elsif is_empty_braces
    cop_config['EnforcedStyleForEmptyBraces'] != 'no_space'
  else
    style != :no_space
  end
end

def hash_literal_with_braces(node)

def hash_literal_with_braces(node)
  tokens = processed_source.tokens
  begin_index = index_of_first_token(node)
  return unless tokens[begin_index].left_brace?
  end_index = index_of_last_token(node)
  return unless tokens[end_index].right_curly_brace?
  yield begin_index, end_index
end

def incorrect_style_detected(token1, token2,

def incorrect_style_detected(token1, token2,
                             expect_space, is_empty_braces)
  brace = (token1.text == '{' ? token1 : token2).pos
  range = expect_space ? brace : space_range(brace)
  add_offense(
    range,
    location: range,
    message: message(brace, is_empty_braces, expect_space)
  ) do
    style = expect_space ? :no_space : :space
    ambiguous_or_unexpected_style_detected(style,
                                           token1.text == token2.text)
  end
end

def message(brace, is_empty_braces, expect_space)

def message(brace, is_empty_braces, expect_space)
  inside_what = if is_empty_braces
                  'empty hash literal braces'
                else
                  brace.source
                end
  problem = expect_space ? 'missing' : 'detected'
  format(MSG, problem: "#{inside_what} #{problem}")
end

def offense?(token1, expect_space)

def offense?(token1, expect_space)
  has_space = token1.space_after?
  expect_space ? !has_space : has_space
end

def on_hash(node)

def on_hash(node)
  tokens = processed_source.tokens
  hash_literal_with_braces(node) do |begin_index, end_index|
    check(tokens[begin_index], tokens[begin_index + 1])
    return if begin_index == end_index - 1
    check(tokens[end_index - 1], tokens[end_index])
  end
end

def range_of_space_to_the_left(range)

def range_of_space_to_the_left(range)
  src = range.source_buffer.source
  begin_pos = range.begin_pos
  begin_pos -= 1 while src[begin_pos - 1] =~ /[ \t]/
  range_between(begin_pos, range.end_pos - 1)
end

def range_of_space_to_the_right(range)

def range_of_space_to_the_right(range)
  src = range.source_buffer.source
  end_pos = range.end_pos
  end_pos += 1 while src[end_pos] =~ /[ \t]/
  range_between(range.begin_pos + 1, end_pos)
end

def space_range(token_range)

def space_range(token_range)
  if token_range.source == '{'
    range_of_space_to_the_right(token_range)
  else
    range_of_space_to_the_left(token_range)
  end
end

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