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Extend Lint/UnusedBlockArgument rule with corrections

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This commit is contained in:
Sijawusz Pur Rahnama 2022-12-19 15:40:59 +01:00
parent f26cd7f823
commit 3586b4242f
2 changed files with 65 additions and 35 deletions
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79
spec/ameba/rule/lint/unused_block_argument_spec.cr
View file

@ -5,105 +5,118 @@ module Ameba::Rule::Lint
describe UnusedBlockArgument do
it "doesn't report if it is an instance var argument" do
s = Source.new %(
expect_no_issues subject, <<-CRYSTAL
class A
def initialize(&@callback)
end
end
)
subject.catch(s).should be_valid
CRYSTAL
end
it "doesn't report if anonymous" do
s = Source.new %(
expect_no_issues subject, <<-CRYSTAL
def method(a, b, c, &)
end
)
subject.catch(s).should be_valid
CRYSTAL
end
it "doesn't report if argument name starts with a `_`" do
s = Source.new %(
expect_no_issues subject, <<-CRYSTAL
def method(a, b, c, &_block)
end
)
subject.catch(s).should be_valid
CRYSTAL
end
it "doesn't report if it is a block and used" do
s = Source.new %(
expect_no_issues subject, <<-CRYSTAL
def method(a, b, c, &block)
block.call
end
)
subject.catch(s).should be_valid
CRYSTAL
end
it "reports if block arg is not used" do
s = Source.new %(
source = expect_issue subject, <<-CRYSTAL
def method(a, b, c, &block)
# ^ error: Unused block argument `block`. [...]
end
)
subject.catch(s).should_not be_valid
CRYSTAL
expect_correction source, <<-CRYSTAL
def method(a, b, c, &_block)
end
CRYSTAL
end
it "reports if unused and there is yield" do
s = Source.new %(
source = expect_issue subject, <<-CRYSTAL
def method(a, b, c, &block)
# ^ error: Use `&` as an argument name to indicate that it won't be referenced.
3.times do |i|
i.try do
yield i
end
end
end
)
subject.catch(s).should_not be_valid
CRYSTAL
expect_correction source, <<-CRYSTAL
def method(a, b, c, &)
3.times do |i|
i.try do
yield i
end
end
end
CRYSTAL
end
it "doesn't report if anonymous and there is yield" do
s = Source.new %(
expect_no_issues subject, <<-CRYSTAL
def method(a, b, c, &)
yield 1
end
)
subject.catch(s).should be_valid
CRYSTAL
end
it "doesn't report if variable is referenced implicitly" do
s = Source.new %(
expect_no_issues subject, <<-CRYSTAL
class Bar < Foo
def method(a, b, c, &block)
super
end
end
)
subject.catch(s).should be_valid
CRYSTAL
end
context "super" do
it "reports if variable is not referenced implicitly by super" do
s = Source.new %(
source = expect_issue subject, <<-CRYSTAL
class Bar < Foo
def method(a, b, c, &block)
# ^ error: Unused block argument `block`. [...]
super a, b, c
end
end
)
subject.catch(s).should_not be_valid
s.issues.first.message.should eq "Unused block argument `block`. If it's necessary, " \
"use `_block` as an argument name to indicate " \
"that it won't be used."
CRYSTAL
expect_correction source, <<-CRYSTAL
class Bar < Foo
def method(a, b, c, &_block)
super a, b, c
end
end
CRYSTAL
end
end
context "macro" do
it "doesn't report if it is a used macro block argument" do
s = Source.new %(
expect_no_issues subject, <<-CRYSTAL
macro my_macro(&block)
{% block %}
end
)
subject.catch(s).should be_valid
CRYSTAL
end
end
end

21
src/ameba/rule/lint/unused_block_argument.cr
View file

@ -31,6 +31,8 @@ module Ameba::Rule::Lint
# Enabled: true
# ```
class UnusedBlockArgument < Base
include AST::Util
properties do
description "Disallows unused block arguments"
end
@ -51,11 +53,26 @@ module Ameba::Rule::Lint
return if block_arg.anonymous?
return if scope.references?(block_arg.variable)
location = block_arg.node.location
end_location = location.try &.adjust(column_number: block_arg.name.size - 1)
if scope.yields?
issue_for block_arg.node, MSG_YIELDED
if location && end_location
issue_for block_arg.node, MSG_YIELDED do |corrector|
corrector.remove(location, end_location)
end
else
issue_for block_arg.node, MSG_YIELDED
end
else
return if block_arg.ignored?
issue_for block_arg.node, MSG_UNUSED % block_arg.name
if location && end_location
issue_for block_arg.node, MSG_UNUSED % block_arg.name do |corrector|
corrector.insert_before(location, '_')
end
else
issue_for block_arg.node, MSG_UNUSED % block_arg.name
end
end
end
end