Class: RuboCop::Cop::Style::ExponentialNotation

Inherits:
Base
  • Object
show all
Includes:
ConfigurableEnforcedStyle
Defined in:
lib/rubocop/cop/style/exponential_notation.rb

Overview

This cop enforces consistency when using exponential notation for numbers in the code (eg 1.2e4). Different styles are supported:

  • `scientific` which enforces a mantissa between 1 (inclusive) and 10 (exclusive).

  • `engineering` which enforces the exponent to be a multiple of 3 and the mantissa to be between 0.1 (inclusive) and 10 (exclusive).

  • `integral` which enforces the mantissa to always be a whole number without trailing zeroes.

Examples:

EnforcedStyle: scientific (default)

# Enforces a mantissa between 1 (inclusive) and 10 (exclusive).

# bad
10e6
0.3e4
11.7e5
3.14e0

# good
1e7
3e3
1.17e6
3.14

EnforcedStyle: engineering

# Enforces using multiple of 3 exponents,
# mantissa should be between 0.1 (inclusive) and 1000 (exclusive)

# bad
3.2e7
0.1e5
12e5
1232e6

# good
32e6
10e3
1.2e6
1.232e9

EnforcedStyle: integral

# Enforces the mantissa to have no decimal part and no
# trailing zeroes.

# bad
3.2e7
0.1e5
120e4

# good
32e6
1e4
12e5

Constant Summary collapse

MESSAGES =
{
  scientific: 'Use a mantissa in [1, 10[.',
  engineering: 'Use an exponent divisible by 3 and a mantissa in [0.1, 1000[.',
  integral: 'Use an integer as mantissa, without trailing zero.'
}.freeze

Constants inherited from Base

Base::RESTRICT_ON_SEND

Instance Attribute Summary

Attributes inherited from Base

#config, #processed_source

Instance Method Summary collapse

Methods included from ConfigurableEnforcedStyle

#alternative_style, #alternative_styles, #ambiguous_style_detected, #correct_style_detected, #detected_style, #detected_style=, #no_acceptable_style!, #no_acceptable_style?, #opposite_style_detected, #style, #style_configured?, #style_detected, #style_parameter_name, #supported_styles, #unexpected_style_detected

Methods inherited from Base

#add_global_offense, #add_offense, autocorrect_incompatible_with, badge, #callbacks_needed, callbacks_needed, #config_to_allow_offenses, #config_to_allow_offenses=, #cop_config, #cop_name, cop_name, department, documentation_url, exclude_from_registry, #excluded_file?, #external_dependency_checksum, inherited, #initialize, joining_forces, lint?, match?, #offenses, #on_investigation_end, #on_new_investigation, #on_other_file, #parse, #ready, #relevant_file?, support_autocorrect?, support_multiple_source?, #target_rails_version, #target_ruby_version

Methods included from ExcludeLimit

#exclude_limit

Methods included from AutocorrectLogic

#autocorrect?, #autocorrect_enabled?, #autocorrect_requested?, #correctable?, #disable_uncorrectable?, #safe_autocorrect?

Methods included from IgnoredNode

#ignore_node, #ignored_node?, #part_of_ignored_node?

Methods included from Util

silence_warnings

Constructor Details

This class inherits a constructor from RuboCop::Cop::Base

Instance Method Details

#on_float(node) ⇒ Object


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# File 'lib/rubocop/cop/style/exponential_notation.rb', line 68

def on_float(node)
  add_offense(node) if offense?(node)
end