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Extend JoinAfterMap to check also calls to sum/product
and rename it to MapInsteadOfBlock (#190)
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parent
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commit
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2 changed files with 18 additions and 13 deletions
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@ -1,13 +1,14 @@
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require "../../../spec_helper"
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require "../../../spec_helper"
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module Ameba::Rule::Performance
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module Ameba::Rule::Performance
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subject = JoinAfterMap.new
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subject = MapInsteadOfBlock.new
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describe JoinAfterMap do
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describe MapInsteadOfBlock do
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it "passes if there is no potential performance improvements" do
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it "passes if there is no potential performance improvements" do
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source = Source.new %(
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source = Source.new %(
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(1..3).join(&.to_s)
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(1..3).join(&.to_s)
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(1..3).join('.', &.to_s)
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(1..3).sum(&.*(2))
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(1..3).product(&.*(2))
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)
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)
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subject.catch(source).should be_valid
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subject.catch(source).should be_valid
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end
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end
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@ -52,7 +53,7 @@ module Ameba::Rule::Performance
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issue.rule.should_not be_nil
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issue.rule.should_not be_nil
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issue.location.to_s.should eq "source.cr:1:8"
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issue.location.to_s.should eq "source.cr:1:8"
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issue.end_location.to_s.should eq "source.cr:1:24"
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issue.end_location.to_s.should eq "source.cr:1:24"
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issue.message.should eq "Use `join(separator) {...}` instead of `map {...}.join(separator)`"
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issue.message.should eq "Use `join {...}` instead of `map {...}.join`"
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end
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end
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end
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end
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end
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end
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@ -1,32 +1,35 @@
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module Ameba::Rule::Performance
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module Ameba::Rule::Performance
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# This rule is used to identify usage of `join` calls that follow `map`.
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# This rule is used to identify usage of `join/sum/product` calls
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# that follow `map`.
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#
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#
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# For example, this is considered inefficient:
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# For example, this is considered inefficient:
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#
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#
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# ```
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# ```
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# (1..3).map(&.to_s).join('.')
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# (1..3).map(&.to_s).join('.')
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# (1..3).map(&.*(2)).sum
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# ```
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# ```
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#
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#
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# And can be written as this:
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# And can be written as this:
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#
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#
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# ```
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# ```
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# (1..3).join('.', &.to_s)
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# (1..3).join('.', &.to_s)
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# (1..3).sum(&.*(2))
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# ```
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# ```
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#
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#
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# YAML configuration example:
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# YAML configuration example:
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#
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#
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# ```
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# ```
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# Performance/JoinAfterMap
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# Performance/MapInsteadOfBlock
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# Enabled: true
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# Enabled: true
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# ```
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# ```
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struct JoinAfterMap < Base
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struct MapInsteadOfBlock < Base
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properties do
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properties do
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description "Identifies usage of `join` calls that follow `map`."
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description "Identifies usage of `join/sum/product` calls that follow `map`."
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end
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end
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CALL_NAMES = %w(join sum product)
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MAP_NAME = "map"
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MAP_NAME = "map"
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JOIN_NAME = "join"
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MSG = "Use `%s {...}` instead of `map {...}.%s`"
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MSG = "Use `join(separator) {...}` instead of `map {...}.join(separator)`"
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def test(source)
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def test(source)
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AST::NodeVisitor.new self, source, skip: [
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AST::NodeVisitor.new self, source, skip: [
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@ -38,11 +41,12 @@ module Ameba::Rule::Performance
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end
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end
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def test(source, node : Crystal::Call)
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def test(source, node : Crystal::Call)
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return unless node.name == JOIN_NAME && (obj = node.obj)
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return unless node.name.in?(CALL_NAMES) && (obj = node.obj)
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return unless obj.is_a?(Crystal::Call) && obj.block
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return unless obj.is_a?(Crystal::Call) && obj.block
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return unless obj.name == MAP_NAME
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return unless obj.name == MAP_NAME
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issue_for obj.name_location, node.name_end_location, MSG
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issue_for obj.name_location, node.name_end_location,
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MSG % {node.name, node.name}
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end
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end
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end
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end
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end
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end
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