loki.lint.rules

Base class for linter rules and available rule types

Classes

GenericRule()	Generic interface for linter rules providing default values and the general check() routine that calls the specific entry points to rules (subroutines, modules, and the source file).
RuleType(value)	Available types for rules with increasing severity.

class RuleType(value)

Bases: Enum

Available types for rules with increasing severity.

INFO = 1

WARN = 2

SERIOUS = 3

ERROR = 4

class GenericRule

Bases: object

Generic interface for linter rules providing default values and the general check() routine that calls the specific entry points to rules (subroutines, modules, and the source file).

When adding a new rule, it must inherit from GenericRule and define type and provide title (and id, if applicable) in docs. Optional configuration values can be defined in config together with the default value for this option. Only the relevant entry points to a rule must be implemented.

type = None

The rule type as one of the categories in RuleType

docs = None

dict with description of the rule

Typically, this should include "id" and "title". Allows for Python’s format specification mini-language in "title" to fill values using data from config, with the field name corresponding to the config key.

config = {}

Dict of configuration keys and their default values

These values can be overriden externally in the linter config file and are passed automatically to the check() routine.

fixable = False

Indicator for a fixable rule that implements a corresponding fix() routine

deprecated = False

Indicator for a deprecated rule

replaced_by = ()

List of rules that replace the deprecated rule, where applicable

classmethod identifiers()

Return list of strings that identify this rule

classmethod check_module(module, rule_report, config)

Perform rule checks on module level

Must be implemented by a rule if applicable.

classmethod check_subroutine(subroutine, rule_report, config, **kwargs)

Perform rule checks on subroutine level

Must be implemented by a rule if applicable.

classmethod check_file(sourcefile, rule_report, config)

Perform rule checks on file level

Must be implemented by a rule if applicable.

classmethod check(ast, rule_report, config, **kwargs)

Perform checks on all entities in the given IR object

This routine calls check_module(), check_subroutine() and check_file() as applicable for all entities in the given IR object.

Parameters:

• ast (Sourcefile or Module or Subroutine) – The IR object to be checked.

• rule_report (RuleReport) – The reporter object in which rule violations should be registered.

• config (dict) – The rule configuration, filled with externally provided configuration values or the rule’s default configuration.

classmethod fix_module(module, rule_report, config)

Fix rule violations on module level

Must be implemented by a rule if applicable.

classmethod fix_subroutine(subroutine, rule_report, config)

Fix rule violations on subroutine level

Must be implemented by a rule if applicable.

classmethod fix_sourcefile(sourcefile, rule_report, config)

Fix rule violations on sourcefile level

Must be implemented by a rule if applicable.