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75 lines
2.1 KiB
Crystal
75 lines
2.1 KiB
Crystal
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module Ameba::Rule::Style
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# This rule is used to identify usage of `is_a?/nil?` calls within filters.
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#
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# For example, this is considered invalid:
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#
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# ```
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# matches = %w[Alice Bob].map(&.match(/^A./))
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#
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# matches.any?(&.is_a?(Regex::MatchData)) # => true
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# matches.one?(&.nil?) # => true
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#
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# typeof(matches.reject(&.nil?)) # => Array(Regex::MatchData | Nil)
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# typeof(matches.select(&.is_a?(Regex::MatchData))) # => Array(Regex::MatchData | Nil)
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# ```
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#
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# And it should be written as this:
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#
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# ```
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# matches = %w[Alice Bob].map(&.match(/^A./))
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#
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# matches.any?(Regex::MatchData) # => true
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# matches.one?(Nil) # => true
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#
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# typeof(matches.reject(Nil)) # => Array(Regex::MatchData)
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# typeof(matches.select(Regex::MatchData)) # => Array(Regex::MatchData)
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# ```
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#
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# YAML configuration example:
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#
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# ```
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# Style/IsAFilter:
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# Enabled: true
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# FilterNames:
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# - select
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# - reject
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# - any?
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# - all?
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# - none?
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# - one?
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# ```
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class IsAFilter < Base
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properties do
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description "Identifies usage of `is_a?/nil?` calls within filters."
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filter_names : Array(String) = %w(select reject any? all? none? one?)
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end
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MSG = "Use `%s(%s)` instead of `%s {...}`"
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def test(source, node : Crystal::Call)
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return unless node.name.in?(filter_names)
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return unless (block = node.block)
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return unless (body = block.body).is_a?(Crystal::IsA)
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return unless (path = body.const).is_a?(Crystal::Path)
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return unless body.obj.is_a?(Crystal::Var)
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name = path.names.join("::")
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name = "::#{name}" if path.global? && !body.nil_check?
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end_location = node.end_location
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if !end_location || end_location.try(&.column_number.zero?)
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if end_location = path.end_location
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end_location = Crystal::Location.new(
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end_location.filename,
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end_location.line_number,
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end_location.column_number + 1
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)
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end
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end
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issue_for node.name_location, end_location,
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MSG % {node.name, name, node.name}
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end
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end
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end
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