Metric-ExtendedMcCabe

Extended Cyclomatic Complexity

Required inputs: RFG

Computes the number of nodes in the control flow graph of a routine that have more than one outgoing edge.

For nodes originating in switch-statements, each nonempty case section is counted. It is also known as cyclomatic complexity.

Metric.Extended_McCabe differs from Metric.McCabe_Complexity in its treatment of short circuit logical operators: it also interprets these operators as resulting in control flow nodes having more than one outgoing edge and therefore adds also the number of shortcut operators (&& and ||) to the value.

Roughly speaking, the value Metric.Extended_McCabe is computed by summing up

• the number of if-statements,
• the number of loop statements (e.g. for and while),
• the number of conditional (?) operators,
• the number of catch clauses,
• the number of nonempty case-sections, and
• the number of shortcut operators
• plus the value one.

So Metric.Extended_McCabe is always greater zero.

Possible Messages

This rule has no predefined messages.

Options

• This rule shares the following common options: exclude_messages_in_system_headers, excludes, includes, justification_checker, post_processing, provider, severity

• This rule shares the following common metric options: base_view_name, excluded_node_types, hierarchy_edge_name, hierarchy_view_name, propagate, report_all_values, report_propagated_values

• The following places define options that affect this rule: Analysis-GlobalOptions

display_name

display_name : str | None = 'Extended Cyclomatic Complexity'

Description of the metric shown in the dashboard. If None, rfg_metric_name is used.

 

max_value

max_value : int | None = None

Maximum allowed value. None if unlimited.

 

min_value

min_value : int | None = None

Minimum allowed value. None if unlimited.

 

rfg_metric_name

rfg_metric_name : str = 'Metric.Extended_McCabe'

Name of the node attribute storing the metric value in the RFG.