Class: RuboCop::Cop::Style::Lambda
- Defined in:
- lib/rubocop/cop/style/lambda.rb
Overview
This cop checks for uses of the pre 1.9 lambda syntax for one-line anonymous functions and uses of the 1.9 lambda syntax for multi-line anonymous functions.
Constant Summary collapse
- SINGLE_MSG =
'Use the new lambda literal syntax `->(params) {...}`.'
- MULTI_MSG =
'Use the `lambda` method for multi-line lambdas.'
- TARGET =
s(:send, nil, :lambda)
Constants included from Util
Util::ASGN_NODES, Util::EQUALS_ASGN_NODES, Util::OPERATOR_METHODS, Util::PROC_NEW_NODE, Util::SHORTHAND_ASGN_NODES
Instance Attribute Summary
Attributes inherited from Cop
#config, #corrections, #offenses, #processed_source
Instance Method Summary collapse
Methods inherited from Cop
#add_offense, all, #autocorrect?, #config_to_allow_offenses, #config_to_allow_offenses=, #cop_config, cop_name, #cop_name, cop_type, #debug?, #display_cop_names?, #exclude_file?, #include_file?, inherited, #initialize, #join_force?, lint?, #message, non_rails, qualified_cop_name, rails?, #relevant_file?, #support_autocorrect?
Methods included from IgnoredNode
#ignore_node, #ignored_node?, #part_of_ignored_node?
Methods included from Util
block_length, command?, comment_line?, const_name, first_part_of_call_chain, lambda?, lambda_or_proc?, line_range, numeric_range_size, on_node, operator?, parentheses?, proc?, range_with_surrounding_space, source_range, strip_quotes
Methods included from PathUtil
Constructor Details
This class inherits a constructor from RuboCop::Cop::Cop
Instance Method Details
#on_block(node) ⇒ Object
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# File 'lib/rubocop/cop/style/lambda.rb', line 15 def on_block(node) # We're looking for # (block # (send nil :lambda) # ...) block_method, = *node return unless block_method == TARGET selector = block_method.loc.selector.source lambda_length = lambda_length(node) if selector != '->' && lambda_length == 0 add_offense(block_method, :expression, SINGLE_MSG) elsif selector == '->' && lambda_length > 0 add_offense(block_method, :expression, MULTI_MSG) end end |