This page lists the diagnostic identifiers reported by checkcode, codeIssues, and nelson-lint.
Each identifier is stable and can be used in configuration files or in local suppressions such as %#ok<NLS0004>.
| ID | Default level | Category | Description |
|---|---|---|---|
| NLS0001 | error | Syntax | Syntax, lexical, input, or read error. The source file cannot be parsed or cannot be read. |
| NLS0002 | warning | Naming | The main function or class name differs from the source file name. |
| NLS0003 | warning | Flow | Code after return, break, or continue is unreachable in the current block. |
| NLS0004 | info | Dataflow | A local variable is assigned but is never used afterwards. The analyzer ignores text inside comments and character vectors, does not count the left side of an assignment as a use, and skips this rule when dynamic assignment patterns make the local dataflow ambiguous. |
| NLS0005 | warning | Dataflow | A local variable is used before its first local assignment in a conservative, simple dataflow case. |
| NLS0006 | warning | Dataflow | A declared output argument is not assigned by the function body. |
| NLS0007 | info | Dataflow | An input argument is never used by the function body. |
| NLS0008 | warning | Flow | A block is empty in a way that is likely accidental. |
| NLS0009 | warning | Flow | A condition is a trivial constant value such as true, false, 1, or 0. |
| NLS0010 | warning | Style | A line ends with trailing whitespace. This diagnostic is trivially fixable. |
| NLS0011 | warning | Style | The file does not end with a newline. This diagnostic is trivially fixable. |
| NLS0012 | warning | Style | A line is longer than the configured maximum length. |
| NLS0013 | error | Repository | A forbidden project term appears in source or help text. |
| NLS0014 | warning or error | Metrics | Cyclomatic complexity is above the configured threshold. |
| NLS0015 | warning or error | Metrics | Modified cyclomatic complexity is above the configured threshold. |
| NLS0016 | error | Security | The source line contains an invisible directional formatting character. |
| NLS0017 | info | Readability | An output display call wraps sprintf. Prefer direct formatted output for clearer code. |
| NLS0018 | info | Readability | A diagnostic call wraps sprintf. Prefer passing formatted arguments directly. |
| NLS0019 | error | Config | The code analyzer configuration file is invalid. |
| NLS0020 | warning | Metrics | A file is longer than the configured maximum number of lines. |
| NLS0021 | warning | Metrics | A function is longer than the configured maximum number of lines. |
| NLS0022 | warning | Security | A dynamic code call or unsafe workspace mutation call is used. Simple command-form load calls can expose an unsafe suggestion to capture loaded data in a struct. |
| NLS0023 | info | Dataflow | A local function is never called inside its file. |
| NLS0024 | warning | Dataflow | A local variable shadows a local function in the same file. |
| NLS0025 | warning | Numeric | A floating-point literal is compared with exact equality. |
| NLS0026 | warning or error | Metrics | Cognitive complexity is above the configured threshold. |
| NLS0027 | allow by default | Documentation | A public function or class has no help comment. This diagnostic can insert a help comment skeleton. |
| NLS0028 | warning | Dataflow | A nested function variable shadows a symbol from a parent scope. |
| NLS0029 | warning | Dataflow | A local variable shadows an imported symbol. |
| NLS0030 | info | Dataflow | An imported symbol is never used. |
| NLS0031 | warning | Classdef | A class property is declared more than once in the same class. |
| NLS0032 | warning | Classdef | A class method is declared more than once in the same class. |
| NLS0033 | warning | Classdef | A class event is declared more than once in the same class. |
| NLS0034 | warning | Dataflow | A local variable or argument shadows a builtin function name. |
| NLS0035 | warning | Classdef | A method variable or argument shadows a class property name. |
| NLS0036 | info | Dataflow | A local assignment shadows an input argument name. |
| NLS0037 | warning | Classdef | A class superclass is listed more than once in the same class. |
| NLS0038 | warning | Classdef | A class attribute is listed more than once in the same class. |
Rule levels can be changed with the rules object in nelson-lint.json. Version 2 configuration files must declare "version": 2. Accepted levels are allow, info, warning, and error.
%#ok<NLS0004>
temporaryValue = computeExpensiveValue();| Version | Description |
|---|---|
| 2.0.0 | initial version |