class RuboCop::Cop::Style::MissingElse
Checks for `if` expressions that do not have an `else` branch.
NOTE: Pattern matching is allowed to have no `else` branch because unlike `if` and `case`, it raises `NoMatchingPatternError` if the pattern doesn't match and without having `else`.
Supported styles are: if, case, both.
@example EnforcedStyle: both (default)
# warn when an `if` or `case` expression is missing an `else` branch. # bad if condition statement end # bad case var when condition statement end # good if condition statement else # the content of `else` branch will be determined by Style/EmptyElse end # good case var when condition statement else # the content of `else` branch will be determined by Style/EmptyElse end
@example EnforcedStyle: if
# warn when an `if` expression is missing an `else` branch. # bad if condition statement end # good if condition statement else # the content of `else` branch will be determined by Style/EmptyElse end # good case var when condition statement end # good case var when condition statement else # the content of `else` branch will be determined by Style/EmptyElse end
@example EnforcedStyle: case
# warn when a `case` expression is missing an `else` branch. # bad case var when condition statement end # good case var when condition statement else # the content of `else` branch will be determined by Style/EmptyElse end # good if condition statement end # good if condition statement else # the content of `else` branch will be determined by Style/EmptyElse end
Constants
- MSG
- MSG_EMPTY
- MSG_NIL
Public Instance Methods
on_case(node)
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# File lib/rubocop/cop/style/missing_else.rb, line 114 def on_case(node) return if if_style? check(node) end
on_case_match(node)
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# File lib/rubocop/cop/style/missing_else.rb, line 120 def on_case_match(node) # do nothing. end
on_normal_if_unless(node)
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# File lib/rubocop/cop/style/missing_else.rb, line 107 def on_normal_if_unless(node) return if case_style? return if unless_else_cop_enabled? && node.unless? check(node) end
Private Instance Methods
case_style?()
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# File lib/rubocop/cop/style/missing_else.rb, line 147 def case_style? style == :case end
check(node)
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# File lib/rubocop/cop/style/missing_else.rb, line 126 def check(node) return if node.else? add_offense(node, message: format(message_template, type: node.type)) end
empty_else_config()
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# File lib/rubocop/cop/style/missing_else.rb, line 169 def empty_else_config config.for_cop('Style/EmptyElse') end
empty_else_cop_enabled?()
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# File lib/rubocop/cop/style/missing_else.rb, line 159 def empty_else_cop_enabled? empty_else_config.fetch('Enabled') end
empty_else_style()
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# File lib/rubocop/cop/style/missing_else.rb, line 163 def empty_else_style return unless empty_else_config.key?('EnforcedStyle') empty_else_config['EnforcedStyle'].to_sym end
if_style?()
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# File lib/rubocop/cop/style/missing_else.rb, line 143 def if_style? style == :if end
message_template()
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# File lib/rubocop/cop/style/missing_else.rb, line 132 def message_template case empty_else_style when :empty MSG_NIL when :nil MSG_EMPTY else MSG end end
unless_else_config()
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# File lib/rubocop/cop/style/missing_else.rb, line 155 def unless_else_config config.for_cop('Style/UnlessElse') end
unless_else_cop_enabled?()
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# File lib/rubocop/cop/style/missing_else.rb, line 151 def unless_else_cop_enabled? unless_else_config.fetch('Enabled') end