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omit_parentheses.rb
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omit_parentheses.rb
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# frozen_string_literal: true
module RuboCop
module Cop
module Style
class MethodCallWithArgsParentheses
# Style omit_parentheses
module OmitParentheses
TRAILING_WHITESPACE_REGEX = /\s+\Z/.freeze
def on_send(node)
return unless node.parenthesized?
return if node.implicit_call?
return if super_call_without_arguments?(node)
return if allowed_camel_case_method_call?(node)
return if legitimate_call_with_parentheses?(node)
add_offense(node, location: node.loc.begin.join(node.loc.end))
end
alias on_csend on_send
alias on_super on_send
alias on_yield on_send
def autocorrect(node)
lambda do |corrector|
if parentheses_at_the_end_of_multiline_call?(node)
corrector.replace(args_begin(node), ' \\')
else
corrector.replace(args_begin(node), ' ')
end
corrector.remove(node.loc.end)
end
end
def message(_node = nil)
'Omit parentheses for method calls with arguments.'
end
private
def super_call_without_arguments?(node)
node.super_type? && node.arguments.none?
end
def allowed_camel_case_method_call?(node)
node.camel_case_method? &&
(node.arguments.none? ||
cop_config['AllowParenthesesInCamelCaseMethod'])
end
def parentheses_at_the_end_of_multiline_call?(node)
node.multiline? &&
node.loc.begin.source_line
.gsub(TRAILING_WHITESPACE_REGEX, '')
.end_with?('(')
end
def legitimate_call_with_parentheses?(node)
call_in_literals?(node) ||
call_with_ambiguous_arguments?(node) ||
call_in_logical_operators?(node) ||
call_in_optional_arguments?(node) ||
allowed_multiline_call_with_parentheses?(node) ||
allowed_chained_call_with_parentheses?(node)
end
def call_in_literals?(node)
node.parent &&
(node.parent.pair_type? ||
node.parent.array_type? ||
node.parent.range_type? ||
splat?(node.parent) ||
ternary_if?(node.parent))
end
def call_in_logical_operators?(node)
parent = node.parent&.block_type? ? node.parent.parent : node.parent
parent &&
(logical_operator?(parent) ||
parent.send_type? &&
parent.arguments.any?(&method(:logical_operator?)))
end
def call_in_optional_arguments?(node)
node.parent &&
(node.parent.optarg_type? || node.parent.kwoptarg_type?)
end
def call_with_ambiguous_arguments?(node)
call_with_braced_block?(node) ||
call_as_argument_or_chain?(node) ||
hash_literal_in_arguments?(node) ||
node.descendants.any? do |n|
ambigious_literal?(n) || logical_operator?(n) ||
call_with_braced_block?(n)
end
end
def call_with_braced_block?(node)
(node.send_type? || node.super_type?) &&
node.block_node && node.block_node.braces?
end
def call_as_argument_or_chain?(node)
node.parent &&
(node.parent.send_type? && !assigned_before?(node.parent, node) ||
node.parent.csend_type? || node.parent.super_type?)
end
def hash_literal_in_arguments?(node)
node.arguments.any? do |n|
hash_literal?(n) ||
n.send_type? && node.descendants.any?(&method(:hash_literal?))
end
end
def allowed_multiline_call_with_parentheses?(node)
cop_config['AllowParenthesesInMultilineCall'] && node.multiline?
end
def allowed_chained_call_with_parentheses?(node)
return false unless cop_config['AllowParenthesesInChaining']
previous = node.descendants.first
return false unless previous&.send_type?
previous.parenthesized? ||
allowed_chained_call_with_parentheses?(previous)
end
def ambigious_literal?(node)
splat?(node) || ternary_if?(node) || regexp_slash_literal?(node) ||
unary_literal?(node)
end
def splat?(node)
node.splat_type? || node.kwsplat_type? || node.block_pass_type?
end
def ternary_if?(node)
node.if_type? && node.ternary?
end
def logical_operator?(node)
(node.and_type? || node.or_type?) && node.logical_operator?
end
def hash_literal?(node)
node.hash_type? && node.braces?
end
def regexp_slash_literal?(node)
node.regexp_type? && node.loc.begin.source == '/'
end
def unary_literal?(node)
node.numeric_type? && node.sign? ||
node.parent&.send_type? && node.parent&.unary_operation?
end
def assigned_before?(node, target)
node.assignment? &&
node.loc.operator.begin < target.loc.begin
end
end
end
end
end
end