> ## Documentation Index
> Fetch the complete documentation index at: https://mehen.ophi.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# Code metrics overview

> What mehen reports for source code: size, complexity, and function/class shape.

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

The umbrella is described on the [LOC family](/metrics/code/loc) page.

## Complexity

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

## Function and class shape

| Metric                         | Key     | Description                                       |
| ------------------------------ | ------- | ------------------------------------------------- |
| [NOM](/metrics/code/nom)       | `nom`   | Number of methods (functions + closures).         |
| [NARGS](/metrics/code/nargs)   | `nargs` | Argument count per function/method.               |
| [NEXITS](/metrics/code/nexits) | `nexit` | Exit-point count per function/method.             |
| [NPA](/metrics/code/npa)       | `npa`   | Number of public attributes (classes/interfaces). |
| [NPM](/metrics/code/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](/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](/metrics/markdown/overview).