class RuboCop::Cop::Style::CommandLiteral
This cop enforces using “ or %x around command literals.
@example
# Good if EnforcedStyle is backticks or mixed, bad if percent_x. folders = `find . -type d`.split # Good if EnforcedStyle is percent_x, bad if backticks or mixed. folders = %x(find . -type d).split # Good if EnforcedStyle is backticks, bad if percent_x or mixed. ` ln -s foo.example.yml foo.example ln -s bar.example.yml bar.example ` # Good if EnforcedStyle is percent_x or mixed, bad if backticks. %x( ln -s foo.example.yml foo.example ln -s bar.example.yml bar.example ) # Bad unless AllowInnerBackticks is true. `echo \`ls\``
Constants
- MSG_USE_BACKTICKS
- MSG_USE_PERCENT_X
Public Instance Methods
on_xstr(node)
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# File lib/rubocop/cop/style/command_literal.rb, line 34 def on_xstr(node) return if heredoc_literal?(node) if backtick_literal?(node) check_backtick_literal(node) else check_percent_x_literal(node) end end
Private Instance Methods
allow_inner_backticks?()
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# File lib/rubocop/cop/style/command_literal.rb, line 86 def allow_inner_backticks? cop_config['AllowInnerBackticks'] end
allowed_backtick_literal?(node)
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# File lib/rubocop/cop/style/command_literal.rb, line 62 def allowed_backtick_literal?(node) case style when :backticks !contains_disallowed_backtick?(node) when :mixed node.single_line? && !contains_disallowed_backtick?(node) end end
allowed_percent_x_literal?(node)
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# File lib/rubocop/cop/style/command_literal.rb, line 71 def allowed_percent_x_literal?(node) case style when :backticks contains_disallowed_backtick?(node) when :mixed node.multiline? || contains_disallowed_backtick?(node) when :percent_x true end end
autocorrect(node)
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# File lib/rubocop/cop/style/command_literal.rb, line 112 def autocorrect(node) return if contains_backtick?(node) replacement = if backtick_literal?(node) ['%x', ''].zip(preferred_delimiters).map(&:join) else %w[` `] end lambda do |corrector| corrector.replace(node.loc.begin, replacement.first) corrector.replace(node.loc.end, replacement.last) end end
backtick_literal?(node)
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# File lib/rubocop/cop/style/command_literal.rb, line 103 def backtick_literal?(node) node.loc.begin.source == '`' end
check_backtick_literal(node)
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# File lib/rubocop/cop/style/command_literal.rb, line 46 def check_backtick_literal(node) return if allowed_backtick_literal?(node) add_offense(node) end
check_percent_x_literal(node)
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# File lib/rubocop/cop/style/command_literal.rb, line 52 def check_percent_x_literal(node) return if allowed_percent_x_literal?(node) add_offense(node) end
contains_backtick?(node)
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# File lib/rubocop/cop/style/command_literal.rb, line 90 def contains_backtick?(node) node_body(node) =~ /`/ end
contains_disallowed_backtick?(node)
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# File lib/rubocop/cop/style/command_literal.rb, line 82 def contains_disallowed_backtick?(node) !allow_inner_backticks? && contains_backtick?(node) end
heredoc_literal?(node)
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# File lib/rubocop/cop/style/command_literal.rb, line 99 def heredoc_literal?(node) node.loc.respond_to?(:heredoc_body) end
message(node)
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# File lib/rubocop/cop/style/command_literal.rb, line 58 def message(node) backtick_literal?(node) ? MSG_USE_PERCENT_X : MSG_USE_BACKTICKS end
node_body(node)
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# File lib/rubocop/cop/style/command_literal.rb, line 94 def node_body(node) loc = node.loc loc.expression.source[loc.begin.length...-loc.end.length] end
preferred_delimiters()
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# File lib/rubocop/cop/style/command_literal.rb, line 107 def preferred_delimiters config.for_cop('Style/PercentLiteralDelimiters') \ ['PreferredDelimiters']['%x'].split(//) end