* [ruby-core:116084] [Ruby master Feature#20164] Add Exception#deconstruct_keys
@ 2024-01-08 20:56 Dan0042 (Daniel DeLorme) via ruby-core
2024-01-10 22:32 ` [ruby-core:116161] " palkan (Vladimir Dementyev) via ruby-core
2024-01-15 17:07 ` [ruby-core:116214] " Dan0042 (Daniel DeLorme) via ruby-core
0 siblings, 2 replies; 3+ messages in thread
From: Dan0042 (Daniel DeLorme) via ruby-core @ 2024-01-08 20:56 UTC (permalink / raw
To: ruby-core; +Cc: Dan0042 (Daniel DeLorme)
Issue #20164 has been reported by Dan0042 (Daniel DeLorme).
----------------------------------------
Feature #20164: Add Exception#deconstruct_keys
https://bugs.ruby-lang.org/issues/20164
* Author: Dan0042 (Daniel DeLorme)
* Status: Open
* Priority: Normal
----------------------------------------
It would be convenient to perform pattern matching with exception classes. So `Exception#deconstruct_keys` should return a hash with `:message` (original_message) as well as any other keys specific to the exception subclass.
Examples:
```
begin
#code
rescue => err
case err
in StandardError(message: /Permission denied/)
abort "please select a different file"
in NameError(name: :foo)
retry if require "foo_helper
else
raise
end
end
```
--
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^ permalink raw reply [flat|nested] 3+ messages in thread
* [ruby-core:116161] [Ruby master Feature#20164] Add Exception#deconstruct_keys
2024-01-08 20:56 [ruby-core:116084] [Ruby master Feature#20164] Add Exception#deconstruct_keys Dan0042 (Daniel DeLorme) via ruby-core
@ 2024-01-10 22:32 ` palkan (Vladimir Dementyev) via ruby-core
2024-01-15 17:07 ` [ruby-core:116214] " Dan0042 (Daniel DeLorme) via ruby-core
1 sibling, 0 replies; 3+ messages in thread
From: palkan (Vladimir Dementyev) via ruby-core @ 2024-01-10 22:32 UTC (permalink / raw
To: ruby-core; +Cc: palkan (Vladimir Dementyev)
Issue #20164 has been updated by palkan (Vladimir Dementyev).
+1 for making exceptions pattern-matching friendly. The example above demonstrates the use case pretty well (class + message matching).
The question is what keys must be supported for each standard exception class? The plain Ruby implementation could be as follows:
```ruby
class Exception
# Not sure if we need to take into account the `keys` argument
def deconstruct_keys(*) = {message:, cause:}
end
class NameError
def deconstruct_keys(*) = super.merge(name:)
end
```
----------------------------------------
Feature #20164: Add Exception#deconstruct_keys
https://bugs.ruby-lang.org/issues/20164#change-106167
* Author: Dan0042 (Daniel DeLorme)
* Status: Open
* Priority: Normal
----------------------------------------
It would be convenient to perform pattern matching with exception classes. So `Exception#deconstruct_keys` should return a hash with `:message` (original_message) as well as any other keys specific to the exception subclass.
Examples:
```
begin
#code
rescue => err
case err
in StandardError(message: /Permission denied/)
abort "please select a different file"
in NameError(name: :foo)
retry if require "foo_helper
else
raise
end
end
```
--
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^ permalink raw reply [flat|nested] 3+ messages in thread
* [ruby-core:116214] [Ruby master Feature#20164] Add Exception#deconstruct_keys
2024-01-08 20:56 [ruby-core:116084] [Ruby master Feature#20164] Add Exception#deconstruct_keys Dan0042 (Daniel DeLorme) via ruby-core
2024-01-10 22:32 ` [ruby-core:116161] " palkan (Vladimir Dementyev) via ruby-core
@ 2024-01-15 17:07 ` Dan0042 (Daniel DeLorme) via ruby-core
1 sibling, 0 replies; 3+ messages in thread
From: Dan0042 (Daniel DeLorme) via ruby-core @ 2024-01-15 17:07 UTC (permalink / raw
To: ruby-core; +Cc: Dan0042 (Daniel DeLorme)
Issue #20164 has been updated by Dan0042 (Daniel DeLorme).
palkan (Vladimir Dementyev) wrote in #note-1:
> The question is what keys must be supported for each standard exception class?
I computed a quick list and it would look something like this.
```
Exception [:sortkey, :inspect, :backtrace, :to_s, :backtrace_locations, :cause, :message]
StopIteration [:result]
FrozenError [:receiver]
SignalException [:signo, :signm]
KeyError [:receiver, :key]
LoadError [:path]
LocalJumpError [:exit_value, :reason]
NameError [:name, :receiver, :local_variables]
NoMatchingPatternKeyError [:key, :matchee]
NoMethodError [:args, :private_call?]
SyntaxError [:path]
SystemCallError [:errno]
SystemExit [:status, :success?]
UncaughtThrowError [:tag, :value]
Encoding::InvalidByteSequenceError [:readagain_bytes, :source_encoding, :source_encoding_name, :incomplete_input?, :destination_encoding, :destination_encoding_name, :error_bytes]
Encoding::UndefinedConversionError [:error_char, :source_encoding, :source_encoding_name, :destination_encoding, :destination_encoding_name]
OptionParser::ParseError [:args, :reason, :additional]
Ractor::RemoteError [:ractor]
Timeout::Error [:thread]
RDoc::RI::Driver::NotFoundError [:name]
RDoc::Store::MissingFileError [:name, :file, :store]
Reline::Config::InvalidInputrc [:file, :lineno]
Gem::LoadError [:name, :requirement]
Gem::ConflictError [:target, :conflicts]
Gem::DependencyResolutionError [:conflict, :conflicting_dependencies]
Gem::FilePermissionError [:directory]
Gem::FormatException [:file_path]
Gem::GemNotInHomeException [:spec]
Gem::ImpossibleDependenciesError [:request, :build_message, :dependency, :conflicts]
Gem::MissingSpecVersionError [:specs]
Gem::RuntimeRequirementNotMetError [:suggestion]
Gem::SpecificGemNotFoundException [:name, :errors, :version]
Gem::SystemExitException [:exit_code]
Gem::UninstallError [:spec]
Gem::UnknownCommandError [:unknown_command]
Gem::UnsatisfiableDependencyError [:name, :dependency, :errors, :version]
Gem::RequestSet::Lockfile::ParseError [:column, :path, :line]
Gem::Resolver::Molinillo::CircularDependencyError [:dependencies]
Gem::Resolver::Molinillo::NoSuchDependencyError [:dependency, :required_by]
Gem::Resolver::Molinillo::VersionConflict [:specification_provider, :conflicts]
```
Even assuming some of those keys are not relevant, that's still a **lot** of #deconstruct_keys to define for various classes, so maybe a dynamic approach like below would be more feasible?
```ruby
class Exception
def deconstruct_keys(*keys)
h = @diagnostics ||= {}
keys.each do |k|
unless h.key?(k)
h[a] = self.send(k) rescue nil
end
end
h
end
end
```
----------------------------------------
Feature #20164: Add Exception#deconstruct_keys
https://bugs.ruby-lang.org/issues/20164#change-106234
* Author: Dan0042 (Daniel DeLorme)
* Status: Open
* Priority: Normal
----------------------------------------
It would be convenient to perform pattern matching with exception classes. So `Exception#deconstruct_keys` should return a hash with `:message` (original_message) as well as any other keys specific to the exception subclass.
Examples:
```
begin
#code
rescue => err
case err
in StandardError(message: /Permission denied/)
abort "please select a different file"
in NameError(name: :foo)
retry if require "foo_helper
else
raise
end
end
```
--
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