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Merge pull request #417 from crystal-ameba/fix-issue-400

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Fix false positive with dynamic literals in `Lint/LiteralsComparison`
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Sijawusz Pur Rahnama 2023-11-09 09:09:54 +01:00 committed by GitHub
commit 3f1e925e07
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2 changed files with 7 additions and 4 deletions
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6
spec/ameba/rule/lint/literals_comparison_spec.cr
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@ -6,6 +6,8 @@ module Ameba::Rule::Lint
describe LiteralsComparison do
it "passes for valid cases" do
expect_no_issues subject, <<-CRYSTAL
{start.year, start.month} == {stop.year, stop.month}
["foo"] === [foo]
"foo" == foo
"foo" != foo
foo == "foo"
@ -15,8 +17,8 @@ module Ameba::Rule::Lint
it "reports if there is a dynamic comparison possibly evaluating to the same" do
expect_issue subject, <<-CRYSTAL
[foo] === ["foo"]
# ^^^^^^^^^^^^^^^ error: Comparison most likely evaluates to the same
[foo] === [foo]
# ^^^^^^^^^^^^^ error: Comparison most likely evaluates to the same
CRYSTAL
end

5
src/ameba/rule/lint/literals_comparison.cr
View file

@ -36,14 +36,15 @@ module Ameba::Rule::Lint
arg_is_literal, arg_is_static = literal_kind?(arg)
return unless obj_is_literal && arg_is_literal
return unless obj.to_s == arg.to_s
is_dynamic = !obj_is_static || !arg_is_static
what =
case node.name
when "===" then "the same"
when "==" then (obj.to_s == arg.to_s).to_s
when "!=" then (obj.to_s != arg.to_s).to_s
when "==" then "true"
when "!=" then "false"
end
issue_for node, (is_dynamic ? MSG_LIKELY : MSG) % what