Module: RuboCop::Cop::Util

Extended by:
AST::Sexp
Includes:
PathUtil
Included in:
Cop, Lint::UnusedBlockArgument
Defined in:
lib/rubocop/cop/util.rb

Overview

This module contains a collection of useful utility methods.

Constant Summary collapse

PROC_NEW_NODE =
s(:send, s(:const, nil, :Proc), :new)
EQUALS_ASGN_NODES =
[:lvasgn, :ivasgn, :cvasgn, :gvasgn, :casgn, :masgn]
SHORTHAND_ASGN_NODES =
[:op_asgn, :or_asgn, :and_asgn]
ASGN_NODES =
EQUALS_ASGN_NODES + SHORTHAND_ASGN_NODES
LITERALS =
[:str, :dstr, :int, :float, :sym, :dsym, :array,
:hash, :regexp, :nil, :true, :false]
BASIC_LITERALS =
LITERALS - [:dstr, :dsym, :array, :hash]
OPERATOR_METHODS =

http://phrogz.net/programmingruby/language.html#table_18.4 Backtick is added last just to help editors parse this code.

%w(
  | ^ & <=> == === =~ > >= < <= << >>
  + - * / % ** ~ +@ -@ [] []= ! != !~
).map(&:to_sym) + [:'`']

Class Method Summary collapse

Methods included from PathUtil

hidden?, issue_deprecation_warning, match_path?, relative_path

Class Method Details

.begins_its_line?(range) ⇒ Boolean

Returns:

  • (Boolean)


193
194
195
196
# File 'lib/rubocop/cop/util.rb', line 193

def begins_its_line?(range)
  source_before_range = range.source_buffer.source[0...range.begin_pos]
  source_before_range.rpartition("\n").last.strip.empty?
end

.block_length(block_node) ⇒ Object



46
47
48
# File 'lib/rubocop/cop/util.rb', line 46

def block_length(block_node)
  block_node.loc.end.line - block_node.loc.begin.line
end

.command?(name, node) ⇒ Boolean

Returns:

  • (Boolean)


85
86
87
88
89
90
91
92
# File 'lib/rubocop/cop/util.rb', line 85

def command?(name, node)
  return unless node.type == :send

  receiver, method_name, _args = *node

  # commands have no explicit receiver
  !receiver && method_name == name
end

.comment_line?(line_source) ⇒ Boolean

Returns:

  • (Boolean)


50
51
52
# File 'lib/rubocop/cop/util.rb', line 50

def comment_line?(line_source)
  line_source =~ /^\s*#/
end

.const_name(node) ⇒ Object



67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
# File 'lib/rubocop/cop/util.rb', line 67

def const_name(node)
  return nil if node.nil? || node.type != :const

  const_names = []
  const_node = node

  loop do
    namespace_node, name = *const_node
    const_names << name
    break unless namespace_node
    break unless namespace_node.is_a?(Parser::AST::Node)
    break if namespace_node.type == :cbase
    const_node = namespace_node
  end

  const_names.reverse.join('::')
end

.directions(side) ⇒ Object



185
186
187
188
189
190
191
# File 'lib/rubocop/cop/util.rb', line 185

def directions(side)
  if side == :both
    [true, true]
  else
    [side == :left, side == :right]
  end
end

.first_part_of_call_chain(node) ⇒ Object

Returns, for example, a bare if node if the given node is an if with calls chained to the end of it.



206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
# File 'lib/rubocop/cop/util.rb', line 206

def first_part_of_call_chain(node)
  while node
    case node.type
    when :send
      receiver, _method_name, _args = *node
      node = receiver
    when :block
      method, _args, _body = *node
      node = method
    else
      break
    end
  end
  node
end

.lambda?(node) ⇒ Boolean

Returns:

  • (Boolean)


94
95
96
97
98
99
100
# File 'lib/rubocop/cop/util.rb', line 94

def lambda?(node)
  fail 'Not a block node' unless node.type == :block

  send_node, _block_args, _block_body = *node

  command?(:lambda, send_node)
end

.lambda_or_proc?(node) ⇒ Boolean

Returns:

  • (Boolean)


110
111
112
# File 'lib/rubocop/cop/util.rb', line 110

def lambda_or_proc?(node)
  lambda?(node) || proc?(node)
end

.line_range(arg) ⇒ Object



54
55
56
57
58
59
60
61
62
63
64
65
# File 'lib/rubocop/cop/util.rb', line 54

def line_range(arg)
  source_range = case arg
                 when Parser::Source::Range
                   arg
                 when Parser::AST::Node
                   arg.loc.expression
                 else
                   fail ArgumentError, "Invalid argument #{arg}"
                 end

  source_range.begin.line..source_range.end.line
end

.move_pos(src, pos, step, condition, regexp) ⇒ Object



179
180
181
182
183
# File 'lib/rubocop/cop/util.rb', line 179

def move_pos(src, pos, step, condition, regexp)
  offset = step == -1 ? -1 : 0
  pos += step while condition && src[pos + offset] =~ regexp
  pos
end

.numeric_range_size(range) ⇒ Object

Range#size is not available prior to Ruby 2.0.



223
224
225
226
227
228
# File 'lib/rubocop/cop/util.rb', line 223

def numeric_range_size(range)
  size = range.end - range.begin
  size += 1 unless range.exclude_end?
  size = 0 if size < 0
  size
end

.on_node(syms, sexp, excludes = []) {|sexp| ... } ⇒ Object

Yields:

  • (sexp)


118
119
120
121
122
123
124
125
126
127
# File 'lib/rubocop/cop/util.rb', line 118

def on_node(syms, sexp, excludes = [])
  yield sexp if Array(syms).include?(sexp.type)

  return if Array(excludes).include?(sexp.type)

  sexp.children.each do |elem|
    next unless elem.is_a?(Parser::AST::Node)
    on_node(syms, elem, excludes) { |s| yield s }
  end
end

.operator?(symbol) ⇒ Boolean

Returns:

  • (Boolean)


29
30
31
# File 'lib/rubocop/cop/util.rb', line 29

def operator?(symbol)
  OPERATOR_METHODS.include?(symbol)
end

.parentheses?(node) ⇒ Boolean

Returns:

  • (Boolean)


114
115
116
# File 'lib/rubocop/cop/util.rb', line 114

def parentheses?(node)
  node.loc.respond_to?(:end) && node.loc.end
end

.proc?(node) ⇒ Boolean

Returns:

  • (Boolean)


102
103
104
105
106
107
108
# File 'lib/rubocop/cop/util.rb', line 102

def proc?(node)
  fail 'Not a block node' unless node.type == :block

  send_node, _block_args, _block_body = *node

  command?(:proc, send_node) || send_node == PROC_NEW_NODE
end

.range_with_surrounding_comma(range, side = :both, buffer = nil) ⇒ Object



149
150
151
152
153
154
155
156
157
158
159
160
161
# File 'lib/rubocop/cop/util.rb', line 149

def range_with_surrounding_comma(range, side = :both, buffer = nil)
  buffer ||= @processed_source.buffer
  src = buffer.source

  go_left, go_right = directions(side)

  begin_pos = range.begin_pos
  end_pos = range.end_pos
  begin_pos = move_pos(src, begin_pos, -1, go_left, /,/)
  end_pos = move_pos(src, end_pos, 1, go_right, /,/)

  Parser::Source::Range.new(buffer, begin_pos, end_pos)
end

.range_with_surrounding_space(range, side = :both, buffer = nil, with_newline = true) ⇒ Object



163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
# File 'lib/rubocop/cop/util.rb', line 163

def range_with_surrounding_space(range, side = :both, buffer = nil,
                                 with_newline = true)
  buffer ||= @processed_source.buffer
  src = buffer.source

  go_left, go_right = directions(side)

  begin_pos = range.begin_pos
  end_pos = range.end_pos
  begin_pos = move_pos(src, begin_pos, -1, go_left, /[ \t]/)
  begin_pos = move_pos(src, begin_pos, -1, go_left && with_newline, /\n/)
  end_pos = move_pos(src, end_pos, 1, go_right, /[ \t]/)
  end_pos = move_pos(src, end_pos, 1, go_right && with_newline, /\n/)
  Parser::Source::Range.new(buffer, begin_pos, end_pos)
end

.source_range(source_buffer, line_number, column, length = 1) ⇒ Object



129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
# File 'lib/rubocop/cop/util.rb', line 129

def source_range(source_buffer, line_number, column, length = 1)
  if column.is_a?(Range)
    column_index = column.begin
    length = numeric_range_size(column)
  else
    column_index = column
  end

  preceding_line_numbers = (1...line_number)

  line_begin_pos = preceding_line_numbers.reduce(0) do |pos, line|
    pos + source_buffer.source_line(line).length + 1
  end

  begin_pos = line_begin_pos + column_index
  end_pos = begin_pos + length

  Parser::Source::Range.new(source_buffer, begin_pos, end_pos)
end

.strip_quotes(str) ⇒ Object



33
34
35
36
37
38
39
40
41
42
43
44
# File 'lib/rubocop/cop/util.rb', line 33

def strip_quotes(str)
  if str[0] == '"' || str[0] == "'"
    str[0] = ''
    str[-1] = ''
  else
    # we're dealing with %q or %Q
    str[0, 3] = ''
    str[-1] = ''
  end

  str
end

.within_node?(inner, outer) ⇒ Boolean

Returns:

  • (Boolean)


198
199
200
201
202
# File 'lib/rubocop/cop/util.rb', line 198

def within_node?(inner, outer)
  o = outer.loc.expression
  i = inner.loc.expression
  i.begin_pos >= o.begin_pos && i.end_pos <= o.end_pos
end