Code metrics overview - mehen

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.

Size

Metric	Key	Description
SLOC	`loc.sloc`	Total physical lines, including blanks and comments.
PLOC	`loc.ploc`	Physical instruction lines (no blanks/comments).
LLOC	`loc.lloc`	Logical lines — statements as defined per language.
CLOC	`loc.cloc`	Comment lines (line + block + doc comments).
Blank	`loc.blank`	Whitespace-only lines.

The umbrella is described on the LOC family page.

Complexity

Metric	Key	Description
Cyclomatic complexity	`cyclomatic`	McCabe’s count of linearly independent paths.
Cognitive complexity	`cognitive`	Sonar’s “how hard to understand” complexity.
Weighted Methods per Class	`wmc`	Sum of cyclomatic complexity across class methods.
Halstead suite	`halstead.*`	Volume, difficulty, effort, bugs, time.
Maintainability Index	`mi.*`	Original, Visual Studio, and SEI variants.
ABC	`abc.*`	Assignments, branches, conditions, magnitude.

Function and class shape

Metric	Key	Description
NOM	`nom`	Number of methods (functions + closures).
NARGS	`nargs`	Argument count per function/method.
NEXITS	`nexit`	Exit-point count per function/method.
NPA	`npa`	Number of public attributes (classes/interfaces).
NPM	`npm`	Number of public methods (classes/interfaces).

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.

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.

History is separate too

How a file changed over time — churn, code age, ownership, hotspots, change coupling, bug risk — is the history.* family, computed from repository history rather than from the parse tree. See History metrics.