Sha256: 33b807981ec50b2c5bd7fed826360d80774ff6907ab17935c06b593fcd4c17cf
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Versions: 11
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Contents
# encoding: utf-8
module RuboCop
module Cop
module Style
# 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.
class Lambda < Cop
SINGLE_MSG = 'Use the new lambda literal syntax `->(params) {...}`.'
MULTI_MSG = 'Use the `lambda` method for multi-line lambdas.'
TARGET = s(:send, nil, :lambda)
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
private
def lambda_length(block_node)
start_line = block_node.loc.begin.line
end_line = block_node.loc.end.line
end_line - start_line
end
end
end
end
end
Version data entries
11 entries across 11 versions & 2 rubygems