Fix a false negative for Performance/RegexpMatch
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Follow up rubocop/rubocop#5569. This PR fixes a false negative for `Performance/RegexpMatch` when `MatchData` is not detected in `if` branch of guard condition. ```console % cat example.rb # frozen_string_literal: true raise unless ex.message =~ /can't modify frozen IOError/ % bundle exec rubocop --only Performance/RegexpMatch Inspecting 1 file . 1 file inspected, no offenses detected ``` This issue was detected by the following code. https://github.com/rails/rails/blob/v6.0.0.rc2/actioncable/test/client_test.rb#L94
Follow up rubocop/rubocop#5569 (comment). This commit fixes a false positive for `Performance/RegexpMatch` when `MatchData` exists after guard condition. The following is an example code with false positive. ```ruby def foo return if /re/ =~ str # `Regexp.last_match[1]` cannot be referenced if changed from `=~` to `match?`. do_something(Regexp.last_match[1]) end ```
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This PR still has the following problem. I will work on this. % cd path/to/rails/rails # https://github.com/rails/rails
% bundle exec rubocop activerecord/lib/arel/visitors/oracle.rb --only Performance/RegexpMatch -d
For /Users/koic/src/github.com/rails/rails: configuration from /Users/koic/src/github.com/rails/rails/.rubocop.yml
configuration from /Users/koic/src/github.com/rubocop-hq/rubocop-performance/config/default.yml
configuration from /Users/koic/src/github.com/rubocop-hq/rubocop-performance/config/default.yml
Default configuration from /Users/koic/.rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/rubocop-0.71.0/config/default.yml
configuration from /Users/koic/.rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/rubocop-rails-2.0.0/config/default.yml
configuration from /Users/koic/.rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/rubocop-rails-2.0.0/config/default.yml
Inspecting 1 file
Scanning /Users/koic/src/github.com/rails/rails/activerecord/lib/arel/visitors/oracle.rb
An error occurred while Performance/RegexpMatch cop was inspecting /Users/koic/src/github.com/rails/rails/activerecord/lib/arel/visitors/oracle.rb:125:51.
undefined method `if_branch' for #<RuboCop::AST::BlockNode:0x00007fedd7303d48>
/Users/koic/src/github.com/rubocop-hq/rubocop-performance/lib/rubocop/cop/performance/regexp_match.rb:207:in `block in next_match_pos'
/Users/koic/src/github.com/rubocop-hq/rubocop-performance/lib/rubocop/cop/performance/regexp_match.rb:127:in `block in search_match_nodes' |
koic
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Jul 28, 2019
Follow up rubocop#73 (comment). This commit fixes an error for `Performance/RegexpMatch` when a regexp used independently with a regexp used in `if` are mixed.
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I fixed the above error. |
Follow up rubocop#73 (comment). This commit fixes an error for `Performance/RegexpMatch` when a regexp used independently with a regexp used in `if` are mixed.
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yahonda
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Sep 9, 2019
* Use RuboCop Performance 1.4.1 * Refer rubocop/rubocop-performance#61 and/or rubocop/rubocop-performance#73 ```ruby $ bundle exec rubocop -a Inspecting 66 files ..........C..C..C......C.................C........................ Offenses: lib/active_record/connection_adapters/oracle_enhanced/database_statements.rb:68:21: C: [Corrected] Performance/RegexpMatch: Use match? instead of =~ when MatchData is not used. return if sql =~ /FROM all_/ ^^^^^^^^^^^^^^^^^^ lib/active_record/connection_adapters/oracle_enhanced/jdbc_connection.rb:241:26: C: [Corrected] Performance/RegexpMatch: Use match? instead of =~ when MatchData is not used. raise unless e.message =~ /^(Closed Connection|Io exception:|No more data to read from socket|IO Error:)/ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ lib/active_record/connection_adapters/oracle_enhanced/oci_connection.rb:321:35: C: [Corrected] Performance/RegexpMatch: Use match? instead of =~ when MatchData is not used. host = "[#{host}]" if host =~ /^[^\[].*:/ # IPv6 ^^^^^^^^^^^^^^^^^^^ lib/active_record/connection_adapters/oracle_enhanced/oci_connection.rb:323:46: C: [Corrected] Performance/RegexpMatch: Use match? instead of match when MatchData is not used. database = "/#{database}" unless database.match(/^\//) ^^^^^^^^^^^^^^^^^^^^^ lib/active_record/connection_adapters/oracle_enhanced/schema_statements.rb:650:46: C: [Corrected] Performance/RegexpMatch: Use match? instead of =~ when MatchData is not used. field["data_default"] = nil if field["data_default"] =~ /^(null|empty_[bc]lob\(\))$/i ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ spec/active_record/connection_adapters/oracle_enhanced/connection_spec.rb:183:58: C: [Corrected] Performance/RegexpMatch: Use match? instead of match when MatchData is not used. params[:database] = "/#{params[:database]}" unless params[:database].match(/^\//) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 66 files inspected, 6 offenses detected, 6 offenses corrected $ ```
patrickm53
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Sep 23, 2022
Follow up rubocop/rubocop-performance#73 (comment). This commit fixes an error for `Performance/RegexpMatch` when a regexp used independently with a regexp used in `if` are mixed.
richardstewart0213
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Nov 4, 2022
Follow up rubocop/rubocop-performance#73 (comment). This commit fixes an error for `Performance/RegexpMatch` when a regexp used independently with a regexp used in `if` are mixed.
Cute0110
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Sep 28, 2023
Follow up rubocop/rubocop-performance#73 (comment). This commit fixes an error for `Performance/RegexpMatch` when a regexp used independently with a regexp used in `if` are mixed.
SerhiiMisiura
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Oct 5, 2023
Follow up rubocop/rubocop-performance#73 (comment). This commit fixes an error for `Performance/RegexpMatch` when a regexp used independently with a regexp used in `if` are mixed.
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Follow up rubocop/rubocop#5569.
This PR fixes a false negative for
Performance/RegexpMatchwhenMatchDatais not detected inifbranch of guard condition.This issue was detected by the following code.
https://github.com/rails/rails/blob/v6.0.0.rc2/actioncable/test/client_test.rb#L94
That is a feedback that @kamipo gave. Thank you.
And follow up rubocop/rubocop#5569 (comment).
This PR prevents a false positive for
Performance/RegexpMatchwhenMatchDataexists after guard condition.The following is an example code with false positive.
Before submitting the PR make sure the following are checked:
[Fix #issue-number](if the related issue exists).master(if not - rebase it).and description in grammatically correct, complete sentences.
bundle exec rake default. It executes all tests and RuboCop for itself, and generates the documentation.