Limit NPath Complexity per Method

WarningMetrics & Complexity Limits#EC MAX_NPATHRemote Enabled

Overview

Limit NPath complexity per procedure.

ATC Finding Message: Procedure NPath complexity exceeds threshold

Rationale

NPath complexity measures the total number of acyclic execution paths through a procedure. Unlike cyclomatic complexity which grows linearly with decision points, NPath complexity grows multiplicatively across sequential and nested control structures (IF, CASE, loops, compound boolean expressions). High NPath complexity makes exhaustive testing impossible. Keep NPath under the threshold by breaking large procedures into cohesive helper methods.

Non-Compliant

METHOD process.
  IF cond_a = abap_true.
    ...
  ENDIF.
  IF cond_b = abap_true.
    ...
  ENDIF.
  IF cond_c = abap_true.
    ...
  ENDIF.
ENDMETHOD.

Compliant

METHOD process.
  handle_condition_a( ).
  handle_condition_b( ).
  handle_condition_c( ).
ENDMETHOD.

Configuration & Thresholds

This check can be fine-tuned directly in the ATC Check Variant Editor (CHKV) in Eclipse ADT:

Parameter Name	Data Type	Default Value	Description & Guidance
MAX_NPATH	Integer	200	Maximum allowed NPath execution paths per procedure (default: 200)

Suppression

To suppress findings for this rule, append the pseudo-comment to the statement:

" Standard pseudo-comment:
... "#EC MAX_NPATH

" SAP CI_ prefix format:
... "#EC CI_MAX_NPATH

Related Rules

• Limit Cyclomatic Complexity (McCabe Complexity Metric) — #EC MAX_CYCLO_COMP
• Limit Cognitive Complexity per Method — #EC MAX_COGNITIVE
• Limit Control Flow Nesting Depth (Guard Clause Enforcement) — #EC MAX_NESTING
• Limit Method and Constructor Statement Length — #EC MAX_METHOD_LEN

Technical Details

• Native ATC Class: ZCL_SKYLINT_MAX_NPATH
• Implementation File: zcl_skylint_max_npath.clas.abap