Class: RuboCop::Cop::Style::FetchEnvVar
Relationships & Source Files | |
Super Chains via Extension / Inclusion / Inheritance | |
Class Chain:
self,
::RuboCop::Cop::AutoCorrector ,
::RuboCop::Cop::Base ,
::RuboCop::ExcludeLimit ,
NodePattern::Macros,
RuboCop::AST::Sexp
|
|
Instance Chain:
self,
::RuboCop::Cop::Base ,
::RuboCop::Cop::AutocorrectLogic ,
::RuboCop::Cop::IgnoredNode ,
::RuboCop::Util ,
RuboCop::AST::Sexp
|
|
Inherits: |
RuboCop::Cop::Base
|
Defined in: | lib/rubocop/cop/style/fetch_env_var.rb |
Overview
Suggests ENV.fetch
for the replacement of ENV[]
.
ENV[]
silently fails and returns nil
when the environment variable is unset,
which may cause unexpected behaviors when the developer forgets to set it.
On the other hand, ENV.fetch
raises KeyError
or returns the explicitly
specified default value.
Constant Summary
-
MSG_WITHOUT_NIL =
# File 'lib/rubocop/cop/style/fetch_env_var.rb', line 42'Use `ENV.fetch(%<key>s)` instead of `ENV[%<key>s]`.'
-
MSG_WITH_NIL =
# File 'lib/rubocop/cop/style/fetch_env_var.rb', line 41'Use `ENV.fetch(%<key>s, nil)` instead of `ENV[%<key>s]`.'
-
RESTRICT_ON_SEND =
# File 'lib/rubocop/cop/style/fetch_env_var.rb', line 43[:[]].freeze
::RuboCop::Cop::Base
- Inherited
Class Attribute Summary
::RuboCop::Cop::AutoCorrector
- Extended
::RuboCop::Cop::Base
- Inherited
.gem_requirements, .lint?, | |
.support_autocorrect? | Returns if class supports autocorrect. |
.support_multiple_source? | Override if your cop should be called repeatedly for multiple investigations Between calls to |
Class Method Summary
::RuboCop::Cop::Base
- Inherited
.autocorrect_incompatible_with | List of cops that should not try to autocorrect at the same time as this cop. |
.badge | Naming. |
.callbacks_needed, .cop_name, .department, | |
.documentation_url | Returns a url to view this cops documentation online. |
.exclude_from_registry | Call for abstract Cop classes. |
.inherited, | |
.joining_forces | Override and return the Force class(es) you need to join. |
.match? | Returns true if the cop name or the cop namespace matches any of the given names. |
.new, | |
.requires_gem | Register a version requirement for the given gem name. |
.restrict_on_send |
::RuboCop::ExcludeLimit
- Extended
exclude_limit | Sets up a configuration option to have an exclude limit tracked. |
transform |
Instance Attribute Summary
- #default_to_nil? ⇒ Boolean readonly private
::RuboCop::Cop::Base
- Inherited
::RuboCop::Cop::AutocorrectLogic
- Included
Instance Method Summary
- #env_with_bracket?(node)
- #on_send(node)
-
#allowable_use?(node) ⇒ Boolean
private
The following are allowed cases:
- #allowed_var?(node) ⇒ Boolean private
-
#assigned?(node) ⇒ Boolean
private
The following are allowed cases:
-
#message_chained_with_dot?(node) ⇒ Boolean
private
Check if the node is a receiver and receives a message with dot syntax.
- #new_code(name_node) private
- #offense_message private
- #offensive?(node) ⇒ Boolean private
- #or_lhs?(node) ⇒ Boolean private
-
#partial_matched?(node, condition) ⇒ Boolean
private
Avoid offending in the following cases:
ENV['key'] if ENV['key'] = x
. - #used_as_flag?(node) ⇒ Boolean private
- #used_if_condition_in_body?(node) ⇒ Boolean private
- #used_in_condition?(node, condition) ⇒ Boolean private
::RuboCop::Cop::Base
- Inherited
#add_global_offense | Adds an offense that has no particular location. |
#add_offense | Adds an offense on the specified range (or node with an expression) Unless that offense is disabled for this range, a corrector will be yielded to provide the cop the opportunity to autocorrect the offense. |
#begin_investigation | Called before any investigation. |
#callbacks_needed, | |
#cop_config | Configuration Helpers. |
#cop_name, #excluded_file?, | |
#external_dependency_checksum | This method should be overridden when a cop’s behavior depends on state that lives outside of these locations: |
#inspect, | |
#message | Gets called if no message is specified when calling |
#name | Alias for Base#cop_name. |
#offenses, | |
#on_investigation_end | Called after all on_… |
#on_new_investigation | Called before all on_… |
#on_other_file | Called instead of all on_… |
#parse | There should be very limited reasons for a Cop to do it’s own parsing. |
#parser_engine, | |
#ready | Called between investigations. |
#relevant_file?, | |
#target_gem_version | Returns a gems locked versions (i.e. |
#target_rails_version, #target_ruby_version, #annotate, #apply_correction, #attempt_correction, | |
#callback_argument | Reserved for Cop::Cop. |
#complete_investigation | Called to complete an investigation. |
#correct, #current_corrector, | |
#current_offense_locations | Reserved for Commissioner: |
#current_offenses, #currently_disabled_lines, #custom_severity, #default_severity, #disable_uncorrectable, #enabled_line?, #file_name_matches_any?, #find_message, #find_severity, #range_for_original, #range_from_node_or_range, | |
#reset_investigation | Actually private methods. |
#use_corrector |
::RuboCop::Cop::AutocorrectLogic
- Included
::RuboCop::Cop::IgnoredNode
- Included
Constructor Details
This class inherits a constructor from RuboCop::Cop::Base
Instance Attribute Details
#default_to_nil? ⇒ Boolean
(readonly, private)
[ GitHub ]
# File 'lib/rubocop/cop/style/fetch_env_var.rb', line 63
def default_to_nil? cop_config.fetch('DefaultToNil', true) end
Instance Method Details
#allowable_use?(node) ⇒ Boolean
(private)
The following are allowed cases:
-
Used as a flag (e.g.,
if ENV['X']
or!ENV['X']
) because it simply checks whether the variable is set. -
Receiving a message with dot syntax, e.g.
ENV['X'].nil?
. -
ENV['key']
assigned by logical AND/OR assignment. -
ENV['key']
is the LHS of a {||}.
# File 'lib/rubocop/cop/style/fetch_env_var.rb', line 128
def allowable_use?(node) used_as_flag?(node) || (node) || assigned?(node) || or_lhs?(node) end
#allowed_var?(node) ⇒ Boolean
(private)
# File 'lib/rubocop/cop/style/fetch_env_var.rb', line 71
def allowed_var?(node) env_key_node = node.children.last env_key_node.str_type? && cop_config['AllowedVars'].include?(env_key_node.value) end
#assigned?(node) ⇒ Boolean
(private)
The following are allowed cases:
-
ENV['key']
is a receiver of {||=}, e.g.ENV['X'] ||= y
. -
ENV['key']
is a receiver of&&=
, e.g.ENV['X'] &&= y
.
# File 'lib/rubocop/cop/style/fetch_env_var.rb', line 136
def assigned?(node) return false unless (parent = node.parent)&.assignment? lhs, _method, _rhs = *parent node == lhs end
#env_with_bracket?(node)
[ GitHub ]# File 'lib/rubocop/cop/style/fetch_env_var.rb', line 46
def_node_matcher :env_with_bracket?, <<~PATTERN (send (const nil? :ENV) :[] $_) PATTERN
#message_chained_with_dot?(node) ⇒ Boolean
(private)
Check if the node is a receiver and receives a message with dot syntax.
# File 'lib/rubocop/cop/style/fetch_env_var.rb', line 112
def (node) return false if node.root? parent = node.parent return false if !parent.call_type? || parent.children.first != node parent.dot? || parent. end
#new_code(name_node) (private)
[ GitHub ]# File 'lib/rubocop/cop/style/fetch_env_var.rb', line 149
def new_code(name_node) if default_to_nil? "ENV.fetch(#{name_node.source}, nil)" else "ENV.fetch(#{name_node.source})" end end
#offense_message (private)
[ GitHub ]# File 'lib/rubocop/cop/style/fetch_env_var.rb', line 67
def default_to_nil? ? MSG_WITH_NIL : MSG_WITHOUT_NIL end
#offensive?(node) ⇒ Boolean
(private)
# File 'lib/rubocop/cop/style/fetch_env_var.rb', line 107
def offensive?(node) !(allowed_var?(node) || allowable_use?(node)) end
#on_send(node)
[ GitHub ]# File 'lib/rubocop/cop/style/fetch_env_var.rb', line 50
def on_send(node) env_with_bracket?(node) do |name_node| break unless offensive?(node) = format(, key: name_node.source) add_offense(node, message: ) do |corrector| corrector.replace(node, new_code(name_node)) end end end
#or_lhs?(node) ⇒ Boolean
(private)
# File 'lib/rubocop/cop/style/fetch_env_var.rb', line 143
def or_lhs?(node) return false unless (parent = node.parent)&.or_type? parent.lhs == node || parent.parent&.or_type? end
#partial_matched?(node, condition) ⇒ Boolean
(private)
Avoid offending in the following cases:
ENV['key'] if ENV['key'] = x
# File 'lib/rubocop/cop/style/fetch_env_var.rb', line 103
def partial_matched?(node, condition) node.child_nodes == node.child_nodes & condition.child_nodes end
#used_as_flag?(node) ⇒ Boolean
(private)
# File 'lib/rubocop/cop/style/fetch_env_var.rb', line 76
def used_as_flag?(node) return false if node.root? return true if used_if_condition_in_body?(node) node.parent.send_type? && (node.parent.prefix_bang? || node.parent.comparison_method?) end
#used_if_condition_in_body?(node) ⇒ Boolean
(private)
# File 'lib/rubocop/cop/style/fetch_env_var.rb', line 83
def used_if_condition_in_body?(node) if_node = node.ancestors.find(&:if_type?) return false unless (condition = if_node&.condition) return true if condition.send_type? && (condition.child_nodes == node.child_nodes) used_in_condition?(node, condition) end
#used_in_condition?(node, condition) ⇒ Boolean
(private)
# File 'lib/rubocop/cop/style/fetch_env_var.rb', line 92
def used_in_condition?(node, condition) if condition.send_type? return true if condition.assignment_method? && partial_matched?(node, condition) return false if !condition.comparison_method? && !condition.predicate_method? end condition.child_nodes.any?(node) end