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# frozen_string_literal: true
module RuboCop
module Cop
module Lint
# Checks for interpolation in a single quoted string.
#
# @safety
# This cop's autocorrection is unsafe because although it always replaces single quotes as
# if it were miswritten double quotes, it is not always the case. For example,
# `'#{foo} bar'` would be replaced by `"#{foo} bar"`, so the replaced code would evaluate
# the expression `foo`.
#
# @example
#
# # bad
#
# foo = 'something with #{interpolation} inside'
#
# @example
#
# # good
#
# foo = "something with #{interpolation} inside"
class InterpolationCheck < Base
extend AutoCorrector
MSG = 'Interpolation in single quoted string detected. ' \
'Use double quoted strings if you need interpolation.'
def on_str(node)
return if node.parent&.regexp_type?
return unless /(?<!\\)#\{.*\}/.match?(node.source)
return if heredoc?(node)
return unless node.loc.begin && node.loc.end
add_offense(node) { |corrector| autocorrect(corrector, node) }
end
private
def autocorrect(corrector, node)
starting_token, ending_token = if node.source.include?('"')
['%{', '}']
else
['"', '"']
end
corrector.replace(node.loc.begin, starting_token)
corrector.replace(node.loc.end, ending_token)
end
def heredoc?(node)
node.loc.is_a?(Parser::Source::Map::Heredoc) || (node.parent && heredoc?(node.parent))
end
end
end
end
end
Version data entries
156 entries across 155 versions & 16 rubygems