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mehen reports three families of source-code metrics, all computed from the language analyzer’s parse tree. Every metric is described on its own page with the canonical formula, what mehen emits, and links to authoritative references.

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Size

MetricKeyDescription
SLOCloc.slocTotal physical lines, including blanks and comments.
PLOCloc.plocPhysical instruction lines (no blanks/comments).
LLOCloc.llocLogical lines — statements as defined per language.
CLOCloc.clocComment lines (line + block + doc comments).
Blankloc.blankWhitespace-only lines.
The umbrella is described on the LOC family page.

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Complexity

MetricKeyDescription
Cyclomatic complexitycyclomaticMcCabe’s count of linearly independent paths.
Cognitive complexitycognitiveSonar’s “how hard to understand” complexity.
Weighted Methods per ClasswmcSum of cyclomatic complexity across class methods.
Halstead suitehalstead.*Volume, difficulty, effort, bugs, time.
Maintainability Indexmi.*Original, Visual Studio, and SEI variants.
ABCabc.*Assignments, branches, conditions, magnitude.

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Function and class shape

MetricKeyDescription
NOMnomNumber of methods (functions + closures).
NARGSnargsArgument count per function/method.
NEXITSnexitExit-point count per function/method.
NPAnpaNumber of public attributes (classes/interfaces).
NPMnpmNumber of public methods (classes/interfaces).

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Spaces

Every metric is also reported per space — the language-aware container for a function, method, class, trait, or module. See Concepts → Spaces for how containers nest and how metric aggregation rolls up to the file.

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Markdown is separate

Markdown documentation gets its own metric family — DMI, MRPC, MCC, link debt, filler/lazy risk, etc. — because functions, classes, and statements do not exist in prose. See Markdown metrics.