Ameba::Rule::Lint::ComparisonToBoolean - ameba 1.7.0

# class Ameba::Rule::Lint::ComparisonToBoolean

- Ameba::Rule::Lint::ComparisonToBoolean
- Ameba::Rule::Base
- Reference
- Object

##
Overview

A rule that disallows comparison to booleans.

For example, these are considered invalid:

    foo == true
    bar != false
    false === baz

This is because these expressions evaluate to `true` or `false`, so you could get the same result by using either the variable directly, or negating the variable.

YAML configuration example:

    Lint/ComparisonToBoolean:
      Enabled: true

##
Included Modules

- Ameba::AST::Util
- YAML::Serializable

##
Defined in:

ameba/rule/lint/comparison_to_boolean.cr

##
Constant Summary

MSG = `"Comparison to a boolean is pointless"`
OP_NAMES = `["==", "!=", "==="] of ::String`

##
Constructors

- .new(ctx : YAML::ParseContext, node : YAML::Nodes::Node)
- .new(config = nil)

  A rule that disallows comparison to booleans.

- .new(*, __context_for_yaml_serializable ctx : YAML::ParseContext, __node_for_yaml_serializable node : YAML::Nodes::Node)

##
Class Method Summary

- .deprecated?

  Returns `true` if this rule is deprecated, `false` otherwise.

- .deprecation_reason : String | Nil

  Returns the deprecation reason for this rule, if there is any.

- .documentation_url : String

  Returns the documentation URL for this rule.

- .parsed_doc : String | Nil

  Returns the documentation for this rule, if there is any.

- .to_json_schema(builder : JSON::Builder) : Nil

##
Instance Method Summary

- #description : String
- #description=(description : String)
- #enabled=(enabled : Bool)
- #enabled? : Bool
- #excluded : Set(String) | Nil
- #excluded=(excluded : Set(String) | Nil)
- #severity : Ameba::Severity
- #severity=(severity : Ameba::Severity)
- #since_version : SemanticVersion | Nil
- #since_version=(since_version : String)
- #test(source, node : Crystal::Call)

### Instance methods inherited from module `Ameba::AST::Util`

abort?(node) abort?, control_exp_code(node : Crystal::ControlExpression, code_lines) control_exp_code, dynamic_literal?(node) : Bool dynamic_literal?, each_inline_directive(source, &block : Crystal::Token, String, Array(String) -> _) each_inline_directive, exit?(node) exit?, flow_command?(node, in_loop) flow_command?, flow_expression?(node, in_loop = false) flow_expression?, has_arguments?(node) : Bool has_arguments?, has_block?(node) : Bool has_block?, has_short_block?(node, code_lines) has_short_block?, heredoc?(node : Crystal::ASTNode, source : Source) heredoc?, literal?(node) : Bool literal?, loop?(node) loop?, name_end_location(node) name_end_location, name_location(node) name_location, name_location_or(token : Crystal::Token, name, *, adjust_location_column_number = nil)
name_location_or(node : Crystal::ASTNode, *, adjust_location_column_number = nil) name_location_or, name_size(node) name_size, node_source(node, code_lines) node_source, nodoc?(node) nodoc?, operator_method?(node) operator_method?, operator_method_name?(name : String) operator_method_name?, path_name(node : Crystal::Path, *, include_global = true) : String path_name, path_named?(node, *names : String) : Bool path_named?, raise?(node) raise?, setter_method?(node) setter_method?, setter_method_name?(name : String) setter_method_name?, short_block?(node, code_lines) short_block?, source_between(loc, end_loc, code_lines) : String | Nil source_between, static_literal?(node) : Bool static_literal?, suffix?(node) suffix?, takes_arguments?(node) : Bool takes_arguments?

### Instance methods inherited from class `Ameba::Rule::Base`

==(other : self) ==, catch(source : Source) catch, excluded?(source, root = Dir.current) excluded?, group group, hash(hasher) hash, name name, special? special?, test(source : Source, node : Crystal::ASTNode, *opts)
test(source : Source) test

### Class methods inherited from class `Ameba::Rule::Base`

default_severity : Ameba::Severity default_severity, group_name group_name, rule_name rule_name

### Macros inherited from class `Ameba::Rule::Base`

issue_for(*args, **kwargs, &block) issue_for

### Macros inherited from module `Ameba::Config::RuleConfig`

properties(&block) properties

##
Constructor Detail

def self.new(ctx : YAML::ParseContext, node : YAML::Nodes::Node) #
def self.new(config = nil) #

A rule that disallows comparison to booleans.

For example, these are considered invalid:

    foo == true
    bar != false
    false === baz

This is because these expressions evaluate to `true` or `false`, so you could get the same result by using either the variable directly, or negating the variable.

YAML configuration example:

    Lint/ComparisonToBoolean:
      Enabled: true

def self.new(*, __context_for_yaml_serializable ctx : YAML::ParseContext, __node_for_yaml_serializable node : YAML::Nodes::Node) #

##
Class Method Detail

def self.deprecated? #

Returns `true` if this rule is deprecated, `false` otherwise.

def self.deprecation_reason : String | Nil #

Returns the deprecation reason for this rule, if there is any.

def self.documentation_url : String #

Returns the documentation URL for this rule.

    Ameba::Rule::Lint::Syntax.documentation_url
    # => "https://crystal-ameba.org/api/master/Ameba/Rule/Lint/Syntax.html"

def self.parsed_doc : String | Nil #

Returns the documentation for this rule, if there is any.

    module Ameba
      # This is a test rule.
      # Does nothing.
      class Rule::MyRule < Rule::Base
        def test(source)
        end
      end
    end

    Ameba::Rule::MyRule.parsed_doc # => "This is a test rule.\nDoes nothing."

def self.to_json_schema(builder : JSON::Builder) : Nil #

##
Instance Method Detail

def description : String #
def description=(description : String) #
def enabled=(enabled : Bool) #
def enabled? : Bool #
def excluded : Set(String) | Nil #
def excluded=(excluded : Set(String) | Nil) #
def severity : Ameba::Severity #
def severity=(severity : Ameba::Severity) #
def since_version : SemanticVersion | Nil #
def since_version=(since_version : String) #
def test(source, node : Crystal::Call) #